src/eval.c

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * eval.c: Expression evaluation.
 */

#include "vim.h"

#if defined(FEAT_EVAL) || defined(PROTO)

#ifdef AMIGA
# include <time.h>	/* for strftime() */
#endif

#ifdef VMS
# include <float.h>
#endif

#ifdef MACOS
# include <time.h>	/* for time_t */
#endif

#if defined(FEAT_FLOAT) && defined(HAVE_MATH_H)
# include <math.h>
#endif

#define DICT_MAXNEST 100	/* maximum nesting of lists and dicts */

#define DO_NOT_FREE_CNT 99999	/* refcount for dict or list that should not
				   be freed. */

/*
 * In a hashtab item "hi_key" points to "di_key" in a dictitem.
 * This avoids adding a pointer to the hashtab item.
 * DI2HIKEY() converts a dictitem pointer to a hashitem key pointer.
 * HIKEY2DI() converts a hashitem key pointer to a dictitem pointer.
 * HI2DI() converts a hashitem pointer to a dictitem pointer.
 */
static dictitem_T dumdi;
#define DI2HIKEY(di) ((di)->di_key)
#define HIKEY2DI(p)  ((dictitem_T *)(p - (dumdi.di_key - (char_u *)&dumdi)))
#define HI2DI(hi)     HIKEY2DI((hi)->hi_key)

/*
 * Structure returned by get_lval() and used by set_var_lval().
 * For a plain name:
 *	"name"	    points to the variable name.
 *	"exp_name"  is NULL.
 *	"tv"	    is NULL
 * For a magic braces name:
 *	"name"	    points to the expanded variable name.
 *	"exp_name"  is non-NULL, to be freed later.
 *	"tv"	    is NULL
 * For an index in a list:
 *	"name"	    points to the (expanded) variable name.
 *	"exp_name"  NULL or non-NULL, to be freed later.
 *	"tv"	    points to the (first) list item value
 *	"li"	    points to the (first) list item
 *	"range", "n1", "n2" and "empty2" indicate what items are used.
 * For an existing Dict item:
 *	"name"	    points to the (expanded) variable name.
 *	"exp_name"  NULL or non-NULL, to be freed later.
 *	"tv"	    points to the dict item value
 *	"newkey"    is NULL
 * For a non-existing Dict item:
 *	"name"	    points to the (expanded) variable name.
 *	"exp_name"  NULL or non-NULL, to be freed later.
 *	"tv"	    points to the Dictionary typval_T
 *	"newkey"    is the key for the new item.
 */
typedef struct lval_S
{
    char_u	*ll_name;	/* start of variable name (can be NULL) */
    char_u	*ll_exp_name;	/* NULL or expanded name in allocated memory. */
    typval_T	*ll_tv;		/* Typeval of item being used.  If "newkey"
				   isn't NULL it's the Dict to which to add
				   the item. */
    listitem_T	*ll_li;		/* The list item or NULL. */
    list_T	*ll_list;	/* The list or NULL. */
    int		ll_range;	/* TRUE when a [i:j] range was used */
    long	ll_n1;		/* First index for list */
    long	ll_n2;		/* Second index for list range */
    int		ll_empty2;	/* Second index is empty: [i:] */
    dict_T	*ll_dict;	/* The Dictionary or NULL */
    dictitem_T	*ll_di;		/* The dictitem or NULL */
    char_u	*ll_newkey;	/* New key for Dict in alloc. mem or NULL. */
} lval_T;

static char *e_letunexp	= N_("E18: Unexpected characters in :let");
static char *e_listidx = N_("E684: list index out of range: %ld");
static char *e_undefvar = N_("E121: Undefined variable: %s");
static char *e_missbrac = N_("E111: Missing ']'");
static char *e_listarg = N_("E686: Argument of %s must be a List");
static char *e_listdictarg = N_("E712: Argument of %s must be a List or Dictionary");
static char *e_listreq = N_("E714: List required");
static char *e_dictreq = N_("E715: Dictionary required");
static char *e_toomanyarg = N_("E118: Too many arguments for function: %s");
static char *e_dictkey = N_("E716: Key not present in Dictionary: %s");
static char *e_funcexts = N_("E122: Function %s already exists, add ! to replace it");
static char *e_funcdict = N_("E717: Dictionary entry already exists");
static char *e_funcref = N_("E718: Funcref required");
static char *e_dictrange = N_("E719: Cannot use [:] with a Dictionary");
static char *e_letwrong = N_("E734: Wrong variable type for %s=");
static char *e_nofunc = N_("E130: Unknown function: %s");
static char *e_illvar = N_("E461: Illegal variable name: %s");
#ifdef FEAT_FLOAT
static char *e_float_as_string = N_("E806: using Float as a String");
#endif

#define NAMESPACE_CHAR	(char_u *)"abglstvw"

static dictitem_T	globvars_var;		/* variable used for g: */
#define globvarht globvardict.dv_hashtab

/*
 * Old Vim variables such as "v:version" are also available without the "v:".
 * Also in functions.  We need a special hashtable for them.
 */
static hashtab_T	compat_hashtab;

/*
 * When recursively copying lists and dicts we need to remember which ones we
 * have done to avoid endless recursiveness.  This unique ID is used for that.
 * The last bit is used for previous_funccal, ignored when comparing.
 */
static int current_copyID = 0;
#define COPYID_INC 2
#define COPYID_MASK (~0x1)

/* Abort conversion to string after a recursion error. */
static int  did_echo_string_emsg = FALSE;

/*
 * Array to hold the hashtab with variables local to each sourced script.
 * Each item holds a variable (nameless) that points to the dict_T.
 */
typedef struct
{
    dictitem_T	sv_var;
    dict_T	sv_dict;
} scriptvar_T;

static garray_T	    ga_scripts = {0, 0, sizeof(scriptvar_T *), 4, NULL};
#define SCRIPT_SV(id) (((scriptvar_T **)ga_scripts.ga_data)[(id) - 1])
#define SCRIPT_VARS(id) (SCRIPT_SV(id)->sv_dict.dv_hashtab)

static int echo_attr = 0;   /* attributes used for ":echo" */

/* Values for trans_function_name() argument: */
#define TFN_INT		1	/* internal function name OK */
#define TFN_QUIET	2	/* no error messages */
#define TFN_NO_AUTOLOAD	4	/* do not use script autoloading */

/* Values for get_lval() flags argument: */
#define GLV_QUIET	TFN_QUIET	/* no error messages */
#define GLV_NO_AUTOLOAD	TFN_NO_AUTOLOAD	/* do not use script autoloading */

/*
 * Structure to hold info for a user function.
 */
typedef struct ufunc ufunc_T;

struct ufunc
{
    int		uf_varargs;	/* variable nr of arguments */
    int		uf_flags;
    int		uf_calls;	/* nr of active calls */
    garray_T	uf_args;	/* arguments */
    garray_T	uf_lines;	/* function lines */
#ifdef FEAT_PROFILE
    int		uf_profiling;	/* TRUE when func is being profiled */
    /* profiling the function as a whole */
    int		uf_tm_count;	/* nr of calls */
    proftime_T	uf_tm_total;	/* time spent in function + children */
    proftime_T	uf_tm_self;	/* time spent in function itself */
    proftime_T	uf_tm_children;	/* time spent in children this call */
    /* profiling the function per line */
    int		*uf_tml_count;	/* nr of times line was executed */
    proftime_T	*uf_tml_total;	/* time spent in a line + children */
    proftime_T	*uf_tml_self;	/* time spent in a line itself */
    proftime_T	uf_tml_start;	/* start time for current line */
    proftime_T	uf_tml_children; /* time spent in children for this line */
    proftime_T	uf_tml_wait;	/* start wait time for current line */
    int		uf_tml_idx;	/* index of line being timed; -1 if none */
    int		uf_tml_execed;	/* line being timed was executed */
#endif
    scid_T	uf_script_ID;	/* ID of script where function was defined,
				   used for s: variables */
    int		uf_refcount;	/* for numbered function: reference count */
    char_u	uf_name[1];	/* name of function (actually longer); can
				   start with <SNR>123_ (<SNR> is K_SPECIAL
				   KS_EXTRA KE_SNR) */
};

/* function flags */
#define FC_ABORT    1		/* abort function on error */
#define FC_RANGE    2		/* function accepts range */
#define FC_DICT	    4		/* Dict function, uses "self" */

/*
 * All user-defined functions are found in this hashtable.
 */
static hashtab_T	func_hashtab;

/* The names of packages that once were loaded are remembered. */
static garray_T		ga_loaded = {0, 0, sizeof(char_u *), 4, NULL};

/* list heads for garbage collection */
static dict_T		*first_dict = NULL;	/* list of all dicts */
static list_T		*first_list = NULL;	/* list of all lists */

/* From user function to hashitem and back. */
static ufunc_T dumuf;
#define UF2HIKEY(fp) ((fp)->uf_name)
#define HIKEY2UF(p)  ((ufunc_T *)(p - (dumuf.uf_name - (char_u *)&dumuf)))
#define HI2UF(hi)     HIKEY2UF((hi)->hi_key)

#define FUNCARG(fp, j)	((char_u **)(fp->uf_args.ga_data))[j]
#define FUNCLINE(fp, j)	((char_u **)(fp->uf_lines.ga_data))[j]

#define MAX_FUNC_ARGS	20	/* maximum number of function arguments */
#define VAR_SHORT_LEN	20	/* short variable name length */
#define FIXVAR_CNT	12	/* number of fixed variables */

/* structure to hold info for a function that is currently being executed. */
typedef struct funccall_S funccall_T;

struct funccall_S
{
    ufunc_T	*func;		/* function being called */
    int		linenr;		/* next line to be executed */
    int		returned;	/* ":return" used */
    struct			/* fixed variables for arguments */
    {
	dictitem_T	var;		/* variable (without room for name) */
	char_u	room[VAR_SHORT_LEN];	/* room for the name */
    } fixvar[FIXVAR_CNT];
    dict_T	l_vars;		/* l: local function variables */
    dictitem_T	l_vars_var;	/* variable for l: scope */
    dict_T	l_avars;	/* a: argument variables */
    dictitem_T	l_avars_var;	/* variable for a: scope */
    list_T	l_varlist;	/* list for a:000 */
    listitem_T	l_listitems[MAX_FUNC_ARGS];	/* listitems for a:000 */
    typval_T	*rettv;		/* return value */
    linenr_T	breakpoint;	/* next line with breakpoint or zero */
    int		dbg_tick;	/* debug_tick when breakpoint was set */
    int		level;		/* top nesting level of executed function */
#ifdef FEAT_PROFILE
    proftime_T	prof_child;	/* time spent in a child */
#endif
    funccall_T	*caller;	/* calling function or NULL */
};

/*
 * Info used by a ":for" loop.
 */
typedef struct
{
    int		fi_semicolon;	/* TRUE if ending in '; var]' */
    int		fi_varcount;	/* nr of variables in the list */
    listwatch_T	fi_lw;		/* keep an eye on the item used. */
    list_T	*fi_list;	/* list being used */
} forinfo_T;

/*
 * Struct used by trans_function_name()
 */
typedef struct
{
    dict_T	*fd_dict;	/* Dictionary used */
    char_u	*fd_newkey;	/* new key in "dict" in allocated memory */
    dictitem_T	*fd_di;		/* Dictionary item used */
} funcdict_T;


/*
 * Array to hold the value of v: variables.
 * The value is in a dictitem, so that it can also be used in the v: scope.
 * The reason to use this table anyway is for very quick access to the
 * variables with the VV_ defines.
 */
#include "version.h"

/* values for vv_flags: */
#define VV_COMPAT	1	/* compatible, also used without "v:" */
#define VV_RO		2	/* read-only */
#define VV_RO_SBX	4	/* read-only in the sandbox */

#define VV_NAME(s, t)	s, {{t, 0, {0}}, 0, {0}}, {0}

static struct vimvar
{
    char	*vv_name;	/* name of variable, without v: */
    dictitem_T	vv_di;		/* value and name for key */
    char	vv_filler[16];	/* space for LONGEST name below!!! */
    char	vv_flags;	/* VV_COMPAT, VV_RO, VV_RO_SBX */
} vimvars[VV_LEN] =
{
    /*
     * The order here must match the VV_ defines in vim.h!
     * Initializing a union does not work, leave tv.vval empty to get zero's.
     */
    {VV_NAME("count",		 VAR_NUMBER), VV_COMPAT+VV_RO},
    {VV_NAME("count1",		 VAR_NUMBER), VV_RO},
    {VV_NAME("prevcount",	 VAR_NUMBER), VV_RO},
    {VV_NAME("errmsg",		 VAR_STRING), VV_COMPAT},
    {VV_NAME("warningmsg",	 VAR_STRING), 0},
    {VV_NAME("statusmsg",	 VAR_STRING), 0},
    {VV_NAME("shell_error",	 VAR_NUMBER), VV_COMPAT+VV_RO},
    {VV_NAME("this_session",	 VAR_STRING), VV_COMPAT},
    {VV_NAME("version",		 VAR_NUMBER), VV_COMPAT+VV_RO},
    {VV_NAME("lnum",		 VAR_NUMBER), VV_RO_SBX},
    {VV_NAME("termresponse",	 VAR_STRING), VV_RO},
    {VV_NAME("fname",		 VAR_STRING), VV_RO},
    {VV_NAME("lang",		 VAR_STRING), VV_RO},
    {VV_NAME("lc_time",		 VAR_STRING), VV_RO},
    {VV_NAME("ctype",		 VAR_STRING), VV_RO},
    {VV_NAME("charconvert_from", VAR_STRING), VV_RO},
    {VV_NAME("charconvert_to",	 VAR_STRING), VV_RO},
    {VV_NAME("fname_in",	 VAR_STRING), VV_RO},
    {VV_NAME("fname_out",	 VAR_STRING), VV_RO},
    {VV_NAME("fname_new",	 VAR_STRING), VV_RO},
    {VV_NAME("fname_diff",	 VAR_STRING), VV_RO},
    {VV_NAME("cmdarg",		 VAR_STRING), VV_RO},
    {VV_NAME("foldstart",	 VAR_NUMBER), VV_RO_SBX},
    {VV_NAME("foldend",		 VAR_NUMBER), VV_RO_SBX},
    {VV_NAME("folddashes",	 VAR_STRING), VV_RO_SBX},
    {VV_NAME("foldlevel",	 VAR_NUMBER), VV_RO_SBX},
    {VV_NAME("progname",	 VAR_STRING), VV_RO},
    {VV_NAME("servername",	 VAR_STRING), VV_RO},
    {VV_NAME("dying",		 VAR_NUMBER), VV_RO},
    {VV_NAME("exception",	 VAR_STRING), VV_RO},
    {VV_NAME("throwpoint",	 VAR_STRING), VV_RO},
    {VV_NAME("register",	 VAR_STRING), VV_RO},
    {VV_NAME("cmdbang",		 VAR_NUMBER), VV_RO},
    {VV_NAME("insertmode",	 VAR_STRING), VV_RO},
    {VV_NAME("val",		 VAR_UNKNOWN), VV_RO},
    {VV_NAME("key",		 VAR_UNKNOWN), VV_RO},
    {VV_NAME("profiling",	 VAR_NUMBER), VV_RO},
    {VV_NAME("fcs_reason",	 VAR_STRING), VV_RO},
    {VV_NAME("fcs_choice",	 VAR_STRING), 0},
    {VV_NAME("beval_bufnr",	 VAR_NUMBER), VV_RO},
    {VV_NAME("beval_winnr",	 VAR_NUMBER), VV_RO},
    {VV_NAME("beval_lnum",	 VAR_NUMBER), VV_RO},
    {VV_NAME("beval_col",	 VAR_NUMBER), VV_RO},
    {VV_NAME("beval_text",	 VAR_STRING), VV_RO},
    {VV_NAME("scrollstart",	 VAR_STRING), 0},
    {VV_NAME("swapname",	 VAR_STRING), VV_RO},
    {VV_NAME("swapchoice",	 VAR_STRING), 0},
    {VV_NAME("swapcommand",	 VAR_STRING), VV_RO},
    {VV_NAME("char",		 VAR_STRING), 0},
    {VV_NAME("mouse_win",	 VAR_NUMBER), 0},
    {VV_NAME("mouse_lnum",	 VAR_NUMBER), 0},
    {VV_NAME("mouse_col",	 VAR_NUMBER), 0},
    {VV_NAME("operator",	 VAR_STRING), VV_RO},
    {VV_NAME("searchforward",	 VAR_NUMBER), 0},
    {VV_NAME("hlsearch",	 VAR_NUMBER), 0},
    {VV_NAME("oldfiles",	 VAR_LIST), 0},
    {VV_NAME("windowid",	 VAR_NUMBER), VV_RO},
    {VV_NAME("progpath",	 VAR_STRING), VV_RO},
    {VV_NAME("completed_item",	 VAR_DICT), VV_RO},
    {VV_NAME("option_new",	 VAR_STRING), VV_RO},
    {VV_NAME("option_old",	 VAR_STRING), VV_RO},
    {VV_NAME("option_type",	 VAR_STRING), VV_RO},
    {VV_NAME("errors",		 VAR_LIST), 0},
    {VV_NAME("false",		 VAR_SPECIAL), VV_RO},
    {VV_NAME("true",		 VAR_SPECIAL), VV_RO},
    {VV_NAME("null",		 VAR_SPECIAL), VV_RO},
    {VV_NAME("none",		 VAR_SPECIAL), VV_RO},
};

/* shorthand */
#define vv_type		vv_di.di_tv.v_type
#define vv_nr		vv_di.di_tv.vval.v_number
#define vv_float	vv_di.di_tv.vval.v_float
#define vv_str		vv_di.di_tv.vval.v_string
#define vv_list		vv_di.di_tv.vval.v_list
#define vv_dict		vv_di.di_tv.vval.v_dict
#define vv_tv		vv_di.di_tv

static dictitem_T	vimvars_var;		/* variable used for v: */
#define vimvarht  vimvardict.dv_hashtab

static void prepare_vimvar(int idx, typval_T *save_tv);
static void restore_vimvar(int idx, typval_T *save_tv);
static int ex_let_vars(char_u *arg, typval_T *tv, int copy, int semicolon, int var_count, char_u *nextchars);
static char_u *skip_var_list(char_u *arg, int *var_count, int *semicolon);
static char_u *skip_var_one(char_u *arg);
static void list_hashtable_vars(hashtab_T *ht, char_u *prefix, int empty, int *first);
static void list_glob_vars(int *first);
static void list_buf_vars(int *first);
static void list_win_vars(int *first);
#ifdef FEAT_WINDOWS
static void list_tab_vars(int *first);
#endif
static void list_vim_vars(int *first);
static void list_script_vars(int *first);
static void list_func_vars(int *first);
static char_u *list_arg_vars(exarg_T *eap, char_u *arg, int *first);
static char_u *ex_let_one(char_u *arg, typval_T *tv, int copy, char_u *endchars, char_u *op);
static int check_changedtick(char_u *arg);
static char_u *get_lval(char_u *name, typval_T *rettv, lval_T *lp, int unlet, int skip, int flags, int fne_flags);
static void clear_lval(lval_T *lp);
static void set_var_lval(lval_T *lp, char_u *endp, typval_T *rettv, int copy, char_u *op);
static int tv_op(typval_T *tv1, typval_T *tv2, char_u  *op);
static void list_fix_watch(list_T *l, listitem_T *item);
static void ex_unletlock(exarg_T *eap, char_u *argstart, int deep);
static int do_unlet_var(lval_T *lp, char_u *name_end, int forceit);
static int do_lock_var(lval_T *lp, char_u *name_end, int deep, int lock);
static void item_lock(typval_T *tv, int deep, int lock);
static int tv_islocked(typval_T *tv);

static int eval0(char_u *arg,  typval_T *rettv, char_u **nextcmd, int evaluate);
static int eval1(char_u **arg, typval_T *rettv, int evaluate);
static int eval2(char_u **arg, typval_T *rettv, int evaluate);
static int eval3(char_u **arg, typval_T *rettv, int evaluate);
static int eval4(char_u **arg, typval_T *rettv, int evaluate);
static int eval5(char_u **arg, typval_T *rettv, int evaluate);
static int eval6(char_u **arg, typval_T *rettv, int evaluate, int want_string);
static int eval7(char_u **arg, typval_T *rettv, int evaluate, int want_string);

static int eval_index(char_u **arg, typval_T *rettv, int evaluate, int verbose);
static int get_option_tv(char_u **arg, typval_T *rettv, int evaluate);
static int get_string_tv(char_u **arg, typval_T *rettv, int evaluate);
static int get_lit_string_tv(char_u **arg, typval_T *rettv, int evaluate);
static int get_list_tv(char_u **arg, typval_T *rettv, int evaluate);
static long list_len(list_T *l);
static int list_equal(list_T *l1, list_T *l2, int ic, int recursive);
static int dict_equal(dict_T *d1, dict_T *d2, int ic, int recursive);
static int tv_equal(typval_T *tv1, typval_T *tv2, int ic, int recursive);
static long list_find_nr(list_T *l, long idx, int *errorp);
static long list_idx_of_item(list_T *l, listitem_T *item);
static int list_append_number(list_T *l, varnumber_T n);
static int list_extend(list_T	*l1, list_T *l2, listitem_T *bef);
static int list_concat(list_T *l1, list_T *l2, typval_T *tv);
static list_T *list_copy(list_T *orig, int deep, int copyID);
static char_u *list2string(typval_T *tv, int copyID);
static int list_join_inner(garray_T *gap, list_T *l, char_u *sep, int echo_style, int copyID, garray_T *join_gap);
static int list_join(garray_T *gap, list_T *l, char_u *sep, int echo, int copyID);
static int free_unref_items(int copyID);
static dictitem_T *dictitem_copy(dictitem_T *org);
static void dictitem_remove(dict_T *dict, dictitem_T *item);
static dict_T *dict_copy(dict_T *orig, int deep, int copyID);
static long dict_len(dict_T *d);
static char_u *dict2string(typval_T *tv, int copyID);
static int get_dict_tv(char_u **arg, typval_T *rettv, int evaluate);
static char_u *echo_string(typval_T *tv, char_u **tofree, char_u *numbuf, int copyID);
static char_u *tv2string(typval_T *tv, char_u **tofree, char_u *numbuf, int copyID);
static char_u *string_quote(char_u *str, int function);
static int get_env_tv(char_u **arg, typval_T *rettv, int evaluate);
static int find_internal_func(char_u *name);
static char_u *deref_func_name(char_u *name, int *lenp, int no_autoload);
static int get_func_tv(char_u *name, int len, typval_T *rettv, char_u **arg, linenr_T firstline, linenr_T lastline, int *doesrange, int evaluate, dict_T *selfdict);
static void emsg_funcname(char *ermsg, char_u *name);
static int non_zero_arg(typval_T *argvars);

#ifdef FEAT_FLOAT
static void f_abs(typval_T *argvars, typval_T *rettv);
static void f_acos(typval_T *argvars, typval_T *rettv);
#endif
static void f_add(typval_T *argvars, typval_T *rettv);
static void f_alloc_fail(typval_T *argvars, typval_T *rettv);
static void f_and(typval_T *argvars, typval_T *rettv);
static void f_append(typval_T *argvars, typval_T *rettv);
static void f_argc(typval_T *argvars, typval_T *rettv);
static void f_argidx(typval_T *argvars, typval_T *rettv);
static void f_arglistid(typval_T *argvars, typval_T *rettv);
static void f_argv(typval_T *argvars, typval_T *rettv);
static void f_assert_equal(typval_T *argvars, typval_T *rettv);
static void f_assert_exception(typval_T *argvars, typval_T *rettv);
static void f_assert_fails(typval_T *argvars, typval_T *rettv);
static void f_assert_false(typval_T *argvars, typval_T *rettv);
static void f_assert_true(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_asin(typval_T *argvars, typval_T *rettv);
static void f_atan(typval_T *argvars, typval_T *rettv);
static void f_atan2(typval_T *argvars, typval_T *rettv);
#endif
static void f_browse(typval_T *argvars, typval_T *rettv);
static void f_browsedir(typval_T *argvars, typval_T *rettv);
static void f_bufexists(typval_T *argvars, typval_T *rettv);
static void f_buflisted(typval_T *argvars, typval_T *rettv);
static void f_bufloaded(typval_T *argvars, typval_T *rettv);
static void f_bufname(typval_T *argvars, typval_T *rettv);
static void f_bufnr(typval_T *argvars, typval_T *rettv);
static void f_bufwinnr(typval_T *argvars, typval_T *rettv);
static void f_byte2line(typval_T *argvars, typval_T *rettv);
static void byteidx(typval_T *argvars, typval_T *rettv, int comp);
static void f_byteidx(typval_T *argvars, typval_T *rettv);
static void f_byteidxcomp(typval_T *argvars, typval_T *rettv);
static void f_call(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_ceil(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_CHANNEL
static void f_ch_open(typval_T *argvars, typval_T *rettv);
static void f_ch_close(typval_T *argvars, typval_T *rettv);
static void f_ch_sendexpr(typval_T *argvars, typval_T *rettv);
static void f_ch_sendraw(typval_T *argvars, typval_T *rettv);
#endif
static void f_changenr(typval_T *argvars, typval_T *rettv);
static void f_char2nr(typval_T *argvars, typval_T *rettv);
static void f_cindent(typval_T *argvars, typval_T *rettv);
static void f_clearmatches(typval_T *argvars, typval_T *rettv);
static void f_col(typval_T *argvars, typval_T *rettv);
#if defined(FEAT_INS_EXPAND)
static void f_complete(typval_T *argvars, typval_T *rettv);
static void f_complete_add(typval_T *argvars, typval_T *rettv);
static void f_complete_check(typval_T *argvars, typval_T *rettv);
#endif
static void f_confirm(typval_T *argvars, typval_T *rettv);
static void f_copy(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_cos(typval_T *argvars, typval_T *rettv);
static void f_cosh(typval_T *argvars, typval_T *rettv);
#endif
static void f_count(typval_T *argvars, typval_T *rettv);
static void f_cscope_connection(typval_T *argvars, typval_T *rettv);
static void f_cursor(typval_T *argsvars, typval_T *rettv);
static void f_deepcopy(typval_T *argvars, typval_T *rettv);
static void f_delete(typval_T *argvars, typval_T *rettv);
static void f_did_filetype(typval_T *argvars, typval_T *rettv);
static void f_diff_filler(typval_T *argvars, typval_T *rettv);
static void f_diff_hlID(typval_T *argvars, typval_T *rettv);
static void f_empty(typval_T *argvars, typval_T *rettv);
static void f_escape(typval_T *argvars, typval_T *rettv);
static void f_eval(typval_T *argvars, typval_T *rettv);
static void f_eventhandler(typval_T *argvars, typval_T *rettv);
static void f_executable(typval_T *argvars, typval_T *rettv);
static void f_exepath(typval_T *argvars, typval_T *rettv);
static void f_exists(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_exp(typval_T *argvars, typval_T *rettv);
#endif
static void f_expand(typval_T *argvars, typval_T *rettv);
static void f_extend(typval_T *argvars, typval_T *rettv);
static void f_feedkeys(typval_T *argvars, typval_T *rettv);
static void f_filereadable(typval_T *argvars, typval_T *rettv);
static void f_filewritable(typval_T *argvars, typval_T *rettv);
static void f_filter(typval_T *argvars, typval_T *rettv);
static void f_finddir(typval_T *argvars, typval_T *rettv);
static void f_findfile(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_float2nr(typval_T *argvars, typval_T *rettv);
static void f_floor(typval_T *argvars, typval_T *rettv);
static void f_fmod(typval_T *argvars, typval_T *rettv);
#endif
static void f_fnameescape(typval_T *argvars, typval_T *rettv);
static void f_fnamemodify(typval_T *argvars, typval_T *rettv);
static void f_foldclosed(typval_T *argvars, typval_T *rettv);
static void f_foldclosedend(typval_T *argvars, typval_T *rettv);
static void f_foldlevel(typval_T *argvars, typval_T *rettv);
static void f_foldtext(typval_T *argvars, typval_T *rettv);
static void f_foldtextresult(typval_T *argvars, typval_T *rettv);
static void f_foreground(typval_T *argvars, typval_T *rettv);
static void f_function(typval_T *argvars, typval_T *rettv);
static void f_garbagecollect(typval_T *argvars, typval_T *rettv);
static void f_get(typval_T *argvars, typval_T *rettv);
static void f_getbufline(typval_T *argvars, typval_T *rettv);
static void f_getbufvar(typval_T *argvars, typval_T *rettv);
static void f_getchar(typval_T *argvars, typval_T *rettv);
static void f_getcharmod(typval_T *argvars, typval_T *rettv);
static void f_getcharsearch(typval_T *argvars, typval_T *rettv);
static void f_getcmdline(typval_T *argvars, typval_T *rettv);
static void f_getcmdpos(typval_T *argvars, typval_T *rettv);
static void f_getcmdtype(typval_T *argvars, typval_T *rettv);
static void f_getcmdwintype(typval_T *argvars, typval_T *rettv);
static void f_getcwd(typval_T *argvars, typval_T *rettv);
static void f_getfontname(typval_T *argvars, typval_T *rettv);
static void f_getfperm(typval_T *argvars, typval_T *rettv);
static void f_getfsize(typval_T *argvars, typval_T *rettv);
static void f_getftime(typval_T *argvars, typval_T *rettv);
static void f_getftype(typval_T *argvars, typval_T *rettv);
static void f_getline(typval_T *argvars, typval_T *rettv);
static void f_getmatches(typval_T *argvars, typval_T *rettv);
static void f_getpid(typval_T *argvars, typval_T *rettv);
static void f_getcurpos(typval_T *argvars, typval_T *rettv);
static void f_getpos(typval_T *argvars, typval_T *rettv);
static void f_getqflist(typval_T *argvars, typval_T *rettv);
static void f_getreg(typval_T *argvars, typval_T *rettv);
static void f_getregtype(typval_T *argvars, typval_T *rettv);
static void f_gettabvar(typval_T *argvars, typval_T *rettv);
static void f_gettabwinvar(typval_T *argvars, typval_T *rettv);
static void f_getwinposx(typval_T *argvars, typval_T *rettv);
static void f_getwinposy(typval_T *argvars, typval_T *rettv);
static void f_getwinvar(typval_T *argvars, typval_T *rettv);
static void f_glob(typval_T *argvars, typval_T *rettv);
static void f_globpath(typval_T *argvars, typval_T *rettv);
static void f_glob2regpat(typval_T *argvars, typval_T *rettv);
static void f_has(typval_T *argvars, typval_T *rettv);
static void f_has_key(typval_T *argvars, typval_T *rettv);
static void f_haslocaldir(typval_T *argvars, typval_T *rettv);
static void f_hasmapto(typval_T *argvars, typval_T *rettv);
static void f_histadd(typval_T *argvars, typval_T *rettv);
static void f_histdel(typval_T *argvars, typval_T *rettv);
static void f_histget(typval_T *argvars, typval_T *rettv);
static void f_histnr(typval_T *argvars, typval_T *rettv);
static void f_hlID(typval_T *argvars, typval_T *rettv);
static void f_hlexists(typval_T *argvars, typval_T *rettv);
static void f_hostname(typval_T *argvars, typval_T *rettv);
static void f_iconv(typval_T *argvars, typval_T *rettv);
static void f_indent(typval_T *argvars, typval_T *rettv);
static void f_index(typval_T *argvars, typval_T *rettv);
static void f_input(typval_T *argvars, typval_T *rettv);
static void f_inputdialog(typval_T *argvars, typval_T *rettv);
static void f_inputlist(typval_T *argvars, typval_T *rettv);
static void f_inputrestore(typval_T *argvars, typval_T *rettv);
static void f_inputsave(typval_T *argvars, typval_T *rettv);
static void f_inputsecret(typval_T *argvars, typval_T *rettv);
static void f_insert(typval_T *argvars, typval_T *rettv);
static void f_invert(typval_T *argvars, typval_T *rettv);
static void f_isdirectory(typval_T *argvars, typval_T *rettv);
static void f_islocked(typval_T *argvars, typval_T *rettv);
static void f_items(typval_T *argvars, typval_T *rettv);
static void f_join(typval_T *argvars, typval_T *rettv);
static void f_jsondecode(typval_T *argvars, typval_T *rettv);
static void f_jsonencode(typval_T *argvars, typval_T *rettv);
static void f_keys(typval_T *argvars, typval_T *rettv);
static void f_last_buffer_nr(typval_T *argvars, typval_T *rettv);
static void f_len(typval_T *argvars, typval_T *rettv);
static void f_libcall(typval_T *argvars, typval_T *rettv);
static void f_libcallnr(typval_T *argvars, typval_T *rettv);
static void f_line(typval_T *argvars, typval_T *rettv);
static void f_line2byte(typval_T *argvars, typval_T *rettv);
static void f_lispindent(typval_T *argvars, typval_T *rettv);
static void f_localtime(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_log(typval_T *argvars, typval_T *rettv);
static void f_log10(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_LUA
static void f_luaeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_map(typval_T *argvars, typval_T *rettv);
static void f_maparg(typval_T *argvars, typval_T *rettv);
static void f_mapcheck(typval_T *argvars, typval_T *rettv);
static void f_match(typval_T *argvars, typval_T *rettv);
static void f_matchadd(typval_T *argvars, typval_T *rettv);
static void f_matchaddpos(typval_T *argvars, typval_T *rettv);
static void f_matcharg(typval_T *argvars, typval_T *rettv);
static void f_matchdelete(typval_T *argvars, typval_T *rettv);
static void f_matchend(typval_T *argvars, typval_T *rettv);
static void f_matchlist(typval_T *argvars, typval_T *rettv);
static void f_matchstr(typval_T *argvars, typval_T *rettv);
static void f_max(typval_T *argvars, typval_T *rettv);
static void f_min(typval_T *argvars, typval_T *rettv);
#ifdef vim_mkdir
static void f_mkdir(typval_T *argvars, typval_T *rettv);
#endif
static void f_mode(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_MZSCHEME
static void f_mzeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_nextnonblank(typval_T *argvars, typval_T *rettv);
static void f_nr2char(typval_T *argvars, typval_T *rettv);
static void f_or(typval_T *argvars, typval_T *rettv);
static void f_pathshorten(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_PERL
static void f_perleval(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_FLOAT
static void f_pow(typval_T *argvars, typval_T *rettv);
#endif
static void f_prevnonblank(typval_T *argvars, typval_T *rettv);
static void f_printf(typval_T *argvars, typval_T *rettv);
static void f_pumvisible(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_PYTHON3
static void f_py3eval(typval_T *argvars, typval_T *rettv);
#endif
#ifdef FEAT_PYTHON
static void f_pyeval(typval_T *argvars, typval_T *rettv);
#endif
static void f_range(typval_T *argvars, typval_T *rettv);
static void f_readfile(typval_T *argvars, typval_T *rettv);
static void f_reltime(typval_T *argvars, typval_T *rettv);
static void f_reltimestr(typval_T *argvars, typval_T *rettv);
static void f_remote_expr(typval_T *argvars, typval_T *rettv);
static void f_remote_foreground(typval_T *argvars, typval_T *rettv);
static void f_remote_peek(typval_T *argvars, typval_T *rettv);
static void f_remote_read(typval_T *argvars, typval_T *rettv);
static void f_remote_send(typval_T *argvars, typval_T *rettv);
static void f_remove(typval_T *argvars, typval_T *rettv);
static void f_rename(typval_T *argvars, typval_T *rettv);
static void f_repeat(typval_T *argvars, typval_T *rettv);
static void f_resolve(typval_T *argvars, typval_T *rettv);
static void f_reverse(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_round(typval_T *argvars, typval_T *rettv);
#endif
static void f_screenattr(typval_T *argvars, typval_T *rettv);
static void f_screenchar(typval_T *argvars, typval_T *rettv);
static void f_screencol(typval_T *argvars, typval_T *rettv);
static void f_screenrow(typval_T *argvars, typval_T *rettv);
static void f_search(typval_T *argvars, typval_T *rettv);
static void f_searchdecl(typval_T *argvars, typval_T *rettv);
static void f_searchpair(typval_T *argvars, typval_T *rettv);
static void f_searchpairpos(typval_T *argvars, typval_T *rettv);
static void f_searchpos(typval_T *argvars, typval_T *rettv);
static void f_server2client(typval_T *argvars, typval_T *rettv);
static void f_serverlist(typval_T *argvars, typval_T *rettv);
static void f_setbufvar(typval_T *argvars, typval_T *rettv);
static void f_setcharsearch(typval_T *argvars, typval_T *rettv);
static void f_setcmdpos(typval_T *argvars, typval_T *rettv);
static void f_setline(typval_T *argvars, typval_T *rettv);
static void f_setloclist(typval_T *argvars, typval_T *rettv);
static void f_setmatches(typval_T *argvars, typval_T *rettv);
static void f_setpos(typval_T *argvars, typval_T *rettv);
static void f_setqflist(typval_T *argvars, typval_T *rettv);
static void f_setreg(typval_T *argvars, typval_T *rettv);
static void f_settabvar(typval_T *argvars, typval_T *rettv);
static void f_settabwinvar(typval_T *argvars, typval_T *rettv);
static void f_setwinvar(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_CRYPT
static void f_sha256(typval_T *argvars, typval_T *rettv);
#endif /* FEAT_CRYPT */
static void f_shellescape(typval_T *argvars, typval_T *rettv);
static void f_shiftwidth(typval_T *argvars, typval_T *rettv);
static void f_simplify(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_sin(typval_T *argvars, typval_T *rettv);
static void f_sinh(typval_T *argvars, typval_T *rettv);
#endif
static void f_sort(typval_T *argvars, typval_T *rettv);
static void f_soundfold(typval_T *argvars, typval_T *rettv);
static void f_spellbadword(typval_T *argvars, typval_T *rettv);
static void f_spellsuggest(typval_T *argvars, typval_T *rettv);
static void f_split(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_sqrt(typval_T *argvars, typval_T *rettv);
static void f_str2float(typval_T *argvars, typval_T *rettv);
#endif
static void f_str2nr(typval_T *argvars, typval_T *rettv);
static void f_strchars(typval_T *argvars, typval_T *rettv);
#ifdef HAVE_STRFTIME
static void f_strftime(typval_T *argvars, typval_T *rettv);
#endif
static void f_stridx(typval_T *argvars, typval_T *rettv);
static void f_string(typval_T *argvars, typval_T *rettv);
static void f_strlen(typval_T *argvars, typval_T *rettv);
static void f_strpart(typval_T *argvars, typval_T *rettv);
static void f_strridx(typval_T *argvars, typval_T *rettv);
static void f_strtrans(typval_T *argvars, typval_T *rettv);
static void f_strdisplaywidth(typval_T *argvars, typval_T *rettv);
static void f_strwidth(typval_T *argvars, typval_T *rettv);
static void f_submatch(typval_T *argvars, typval_T *rettv);
static void f_substitute(typval_T *argvars, typval_T *rettv);
static void f_synID(typval_T *argvars, typval_T *rettv);
static void f_synIDattr(typval_T *argvars, typval_T *rettv);
static void f_synIDtrans(typval_T *argvars, typval_T *rettv);
static void f_synstack(typval_T *argvars, typval_T *rettv);
static void f_synconcealed(typval_T *argvars, typval_T *rettv);
static void f_system(typval_T *argvars, typval_T *rettv);
static void f_systemlist(typval_T *argvars, typval_T *rettv);
static void f_tabpagebuflist(typval_T *argvars, typval_T *rettv);
static void f_tabpagenr(typval_T *argvars, typval_T *rettv);
static void f_tabpagewinnr(typval_T *argvars, typval_T *rettv);
static void f_taglist(typval_T *argvars, typval_T *rettv);
static void f_tagfiles(typval_T *argvars, typval_T *rettv);
static void f_tempname(typval_T *argvars, typval_T *rettv);
static void f_test(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_tan(typval_T *argvars, typval_T *rettv);
static void f_tanh(typval_T *argvars, typval_T *rettv);
#endif
static void f_tolower(typval_T *argvars, typval_T *rettv);
static void f_toupper(typval_T *argvars, typval_T *rettv);
static void f_tr(typval_T *argvars, typval_T *rettv);
#ifdef FEAT_FLOAT
static void f_trunc(typval_T *argvars, typval_T *rettv);
#endif
static void f_type(typval_T *argvars, typval_T *rettv);
static void f_undofile(typval_T *argvars, typval_T *rettv);
static void f_undotree(typval_T *argvars, typval_T *rettv);
static void f_uniq(typval_T *argvars, typval_T *rettv);
static void f_values(typval_T *argvars, typval_T *rettv);
static void f_virtcol(typval_T *argvars, typval_T *rettv);
static void f_visualmode(typval_T *argvars, typval_T *rettv);
static void f_wildmenumode(typval_T *argvars, typval_T *rettv);
static void f_winbufnr(typval_T *argvars, typval_T *rettv);
static void f_wincol(typval_T *argvars, typval_T *rettv);
static void f_winheight(typval_T *argvars, typval_T *rettv);
static void f_winline(typval_T *argvars, typval_T *rettv);
static void f_winnr(typval_T *argvars, typval_T *rettv);
static void f_winrestcmd(typval_T *argvars, typval_T *rettv);
static void f_winrestview(typval_T *argvars, typval_T *rettv);
static void f_winsaveview(typval_T *argvars, typval_T *rettv);
static void f_winwidth(typval_T *argvars, typval_T *rettv);
static void f_writefile(typval_T *argvars, typval_T *rettv);
static void f_wordcount(typval_T *argvars, typval_T *rettv);
static void f_xor(typval_T *argvars, typval_T *rettv);

static int list2fpos(typval_T *arg, pos_T *posp, int *fnump, colnr_T *curswantp);
static pos_T *var2fpos(typval_T *varp, int dollar_lnum, int *fnum);
static int get_env_len(char_u **arg);
static int get_id_len(char_u **arg);
static int get_name_len(char_u **arg, char_u **alias, int evaluate, int verbose);
static char_u *find_name_end(char_u *arg, char_u **expr_start, char_u **expr_end, int flags);
#define FNE_INCL_BR	1	/* find_name_end(): include [] in name */
#define FNE_CHECK_START	2	/* find_name_end(): check name starts with
				   valid character */
static char_u * make_expanded_name(char_u *in_start, char_u *expr_start, char_u *expr_end, char_u *in_end);
static int eval_isnamec(int c);
static int eval_isnamec1(int c);
static int get_var_tv(char_u *name, int len, typval_T *rettv, dictitem_T **dip, int verbose, int no_autoload);
static int handle_subscript(char_u **arg, typval_T *rettv, int evaluate, int verbose);
static typval_T *alloc_string_tv(char_u *string);
static void init_tv(typval_T *varp);
static long get_tv_number(typval_T *varp);
#ifdef FEAT_FLOAT
static float_T get_tv_float(typval_T *varp);
#endif
static linenr_T get_tv_lnum(typval_T *argvars);
static linenr_T get_tv_lnum_buf(typval_T *argvars, buf_T *buf);
static char_u *get_tv_string(typval_T *varp);
static char_u *get_tv_string_buf(typval_T *varp, char_u *buf);
static dictitem_T *find_var(char_u *name, hashtab_T **htp, int no_autoload);
static dictitem_T *find_var_in_ht(hashtab_T *ht, int htname, char_u *varname, int no_autoload);
static hashtab_T *find_var_ht(char_u *name, char_u **varname);
static funccall_T *get_funccal(void);
static void vars_clear_ext(hashtab_T *ht, int free_val);
static void delete_var(hashtab_T *ht, hashitem_T *hi);
static void list_one_var(dictitem_T *v, char_u *prefix, int *first);
static void list_one_var_a(char_u *prefix, char_u *name, int type, char_u *string, int *first);
static void set_var(char_u *name, typval_T *varp, int copy);
static int var_check_ro(int flags, char_u *name, int use_gettext);
static int var_check_fixed(int flags, char_u *name, int use_gettext);
static int var_check_func_name(char_u *name, int new_var);
static int valid_varname(char_u *varname);
static int tv_check_lock(int lock, char_u *name, int use_gettext);
static int item_copy(typval_T *from, typval_T *to, int deep, int copyID);
static char_u *find_option_end(char_u **arg, int *opt_flags);
static char_u *trans_function_name(char_u **pp, int skip, int flags, funcdict_T *fd);
static int eval_fname_script(char_u *p);
static int eval_fname_sid(char_u *p);
static void list_func_head(ufunc_T *fp, int indent);
static ufunc_T *find_func(char_u *name);
static int function_exists(char_u *name);
static int builtin_function(char_u *name, int len);
#ifdef FEAT_PROFILE
static void func_do_profile(ufunc_T *fp);
static void prof_sort_list(FILE *fd, ufunc_T **sorttab, int st_len, char *title, int prefer_self);
static void prof_func_line(FILE *fd, int count, proftime_T *total, proftime_T *self, int prefer_self);
static int
# ifdef __BORLANDC__
    _RTLENTRYF
# endif
	prof_total_cmp(const void *s1, const void *s2);
static int
# ifdef __BORLANDC__
    _RTLENTRYF
# endif
	prof_self_cmp(const void *s1, const void *s2);
#endif
static int script_autoload(char_u *name, int reload);
static char_u *autoload_name(char_u *name);
static void cat_func_name(char_u *buf, ufunc_T *fp);
static void func_free(ufunc_T *fp);
static void call_user_func(ufunc_T *fp, int argcount, typval_T *argvars, typval_T *rettv, linenr_T firstline, linenr_T lastline, dict_T *selfdict);
static int can_free_funccal(funccall_T *fc, int copyID) ;
static void free_funccal(funccall_T *fc, int free_val);
static void add_nr_var(dict_T *dp, dictitem_T *v, char *name, varnumber_T nr);
static win_T *find_win_by_nr(typval_T *vp, tabpage_T *tp);
static win_T *find_tabwin(typval_T *wvp, typval_T *tvp);
static void getwinvar(typval_T *argvars, typval_T *rettv, int off);
static int searchpair_cmn(typval_T *argvars, pos_T *match_pos);
static int search_cmn(typval_T *argvars, pos_T *match_pos, int *flagsp);
static void setwinvar(typval_T *argvars, typval_T *rettv, int off);
static int write_list(FILE *fd, list_T *list, int binary);
static void get_cmd_output_as_rettv(typval_T *argvars, typval_T *rettv, int retlist);


#ifdef EBCDIC
static int compare_func_name(const void *s1, const void *s2);
static void sortFunctions();
#endif

/*
 * Initialize the global and v: variables.
 */
    void
eval_init(void)
{
    int		    i;
    struct vimvar   *p;

    init_var_dict(&globvardict, &globvars_var, VAR_DEF_SCOPE);
    init_var_dict(&vimvardict, &vimvars_var, VAR_SCOPE);
    vimvardict.dv_lock = VAR_FIXED;
    hash_init(&compat_hashtab);
    hash_init(&func_hashtab);

    for (i = 0; i < VV_LEN; ++i)
    {
	p = &vimvars[i];
	STRCPY(p->vv_di.di_key, p->vv_name);
	if (p->vv_flags & VV_RO)
	    p->vv_di.di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
	else if (p->vv_flags & VV_RO_SBX)
	    p->vv_di.di_flags = DI_FLAGS_RO_SBX | DI_FLAGS_FIX;
	else
	    p->vv_di.di_flags = DI_FLAGS_FIX;

	/* add to v: scope dict, unless the value is not always available */
	if (p->vv_type != VAR_UNKNOWN)
	    hash_add(&vimvarht, p->vv_di.di_key);
	if (p->vv_flags & VV_COMPAT)
	    /* add to compat scope dict */
	    hash_add(&compat_hashtab, p->vv_di.di_key);
    }
    vimvars[VV_VERSION].vv_nr = VIM_VERSION_100;

    set_vim_var_nr(VV_SEARCHFORWARD, 1L);
    set_vim_var_nr(VV_HLSEARCH, 1L);
    set_vim_var_dict(VV_COMPLETED_ITEM, dict_alloc());
    set_vim_var_list(VV_ERRORS, list_alloc());

    set_vim_var_nr(VV_FALSE, VVAL_FALSE);
    set_vim_var_nr(VV_TRUE, VVAL_TRUE);
    set_vim_var_nr(VV_NONE, VVAL_NONE);
    set_vim_var_nr(VV_NULL, VVAL_NULL);

    set_reg_var(0);  /* default for v:register is not 0 but '"' */

#ifdef EBCDIC
    /*
     * Sort the function table, to enable binary search.
     */
    sortFunctions();
#endif
}

#if defined(EXITFREE) || defined(PROTO)
    void
eval_clear(void)
{
    int		    i;
    struct vimvar   *p;

    for (i = 0; i < VV_LEN; ++i)
    {
	p = &vimvars[i];
	if (p->vv_di.di_tv.v_type == VAR_STRING)
	{
	    vim_free(p->vv_str);
	    p->vv_str = NULL;
	}
	else if (p->vv_di.di_tv.v_type == VAR_LIST)
	{
	    list_unref(p->vv_list);
	    p->vv_list = NULL;
	}
    }
    hash_clear(&vimvarht);
    hash_init(&vimvarht);  /* garbage_collect() will access it */
    hash_clear(&compat_hashtab);

    free_scriptnames();
# if defined(FEAT_CMDL_COMPL)
    free_locales();
# endif

    /* global variables */
    vars_clear(&globvarht);

    /* autoloaded script names */
    ga_clear_strings(&ga_loaded);

    /* Script-local variables. First clear all the variables and in a second
     * loop free the scriptvar_T, because a variable in one script might hold
     * a reference to the whole scope of another script. */
    for (i = 1; i <= ga_scripts.ga_len; ++i)
	vars_clear(&SCRIPT_VARS(i));
    for (i = 1; i <= ga_scripts.ga_len; ++i)
	vim_free(SCRIPT_SV(i));
    ga_clear(&ga_scripts);

    /* unreferenced lists and dicts */
    (void)garbage_collect();

    /* functions */
    free_all_functions();
    hash_clear(&func_hashtab);
}
#endif

/*
 * Return the name of the executed function.
 */
    char_u *
func_name(void *cookie)
{
    return ((funccall_T *)cookie)->func->uf_name;
}

/*
 * Return the address holding the next breakpoint line for a funccall cookie.
 */
    linenr_T *
func_breakpoint(void *cookie)
{
    return &((funccall_T *)cookie)->breakpoint;
}

/*
 * Return the address holding the debug tick for a funccall cookie.
 */
    int *
func_dbg_tick(void *cookie)
{
    return &((funccall_T *)cookie)->dbg_tick;
}

/*
 * Return the nesting level for a funccall cookie.
 */
    int
func_level(void *cookie)
{
    return ((funccall_T *)cookie)->level;
}

/* pointer to funccal for currently active function */
funccall_T *current_funccal = NULL;

/* pointer to list of previously used funccal, still around because some
 * item in it is still being used. */
funccall_T *previous_funccal = NULL;

/*
 * Return TRUE when a function was ended by a ":return" command.
 */
    int
current_func_returned(void)
{
    return current_funccal->returned;
}


/*
 * Set an internal variable to a string value. Creates the variable if it does
 * not already exist.
 */
    void
set_internal_string_var(char_u *name, char_u *value)
{
    char_u	*val;
    typval_T	*tvp;

    val = vim_strsave(value);
    if (val != NULL)
    {
	tvp = alloc_string_tv(val);
	if (tvp != NULL)
	{
	    set_var(name, tvp, FALSE);
	    free_tv(tvp);
	}
    }
}

static lval_T	*redir_lval = NULL;
static garray_T redir_ga;	/* only valid when redir_lval is not NULL */
static char_u	*redir_endp = NULL;
static char_u	*redir_varname = NULL;

/*
 * Start recording command output to a variable
 * When "append" is TRUE append to an existing variable.
 * Returns OK if successfully completed the setup.  FAIL otherwise.
 */
    int
var_redir_start(char_u *name, int append)
{
    int		save_emsg;
    int		err;
    typval_T	tv;

    /* Catch a bad name early. */
    if (!eval_isnamec1(*name))
    {
	EMSG(_(e_invarg));
	return FAIL;
    }

    /* Make a copy of the name, it is used in redir_lval until redir ends. */
    redir_varname = vim_strsave(name);
    if (redir_varname == NULL)
	return FAIL;

    redir_lval = (lval_T *)alloc_clear((unsigned)sizeof(lval_T));
    if (redir_lval == NULL)
    {
	var_redir_stop();
	return FAIL;
    }

    /* The output is stored in growarray "redir_ga" until redirection ends. */
    ga_init2(&redir_ga, (int)sizeof(char), 500);

    /* Parse the variable name (can be a dict or list entry). */
    redir_endp = get_lval(redir_varname, NULL, redir_lval, FALSE, FALSE, 0,
							     FNE_CHECK_START);
    if (redir_endp == NULL || redir_lval->ll_name == NULL || *redir_endp != NUL)
    {
	clear_lval(redir_lval);
	if (redir_endp != NULL && *redir_endp != NUL)
	    /* Trailing characters are present after the variable name */
	    EMSG(_(e_trailing));
	else
	    EMSG(_(e_invarg));
	redir_endp = NULL;  /* don't store a value, only cleanup */
	var_redir_stop();
	return FAIL;
    }

    /* check if we can write to the variable: set it to or append an empty
     * string */
    save_emsg = did_emsg;
    did_emsg = FALSE;
    tv.v_type = VAR_STRING;
    tv.vval.v_string = (char_u *)"";
    if (append)
	set_var_lval(redir_lval, redir_endp, &tv, TRUE, (char_u *)".");
    else
	set_var_lval(redir_lval, redir_endp, &tv, TRUE, (char_u *)"=");
    clear_lval(redir_lval);
    err = did_emsg;
    did_emsg |= save_emsg;
    if (err)
    {
	redir_endp = NULL;  /* don't store a value, only cleanup */
	var_redir_stop();
	return FAIL;
    }

    return OK;
}

/*
 * Append "value[value_len]" to the variable set by var_redir_start().
 * The actual appending is postponed until redirection ends, because the value
 * appended may in fact be the string we write to, changing it may cause freed
 * memory to be used:
 *   :redir => foo
 *   :let foo
 *   :redir END
 */
    void
var_redir_str(char_u *value, int value_len)
{
    int		len;

    if (redir_lval == NULL)
	return;

    if (value_len == -1)
	len = (int)STRLEN(value);	/* Append the entire string */
    else
	len = value_len;		/* Append only "value_len" characters */

    if (ga_grow(&redir_ga, len) == OK)
    {
	mch_memmove((char *)redir_ga.ga_data + redir_ga.ga_len, value, len);
	redir_ga.ga_len += len;
    }
    else
	var_redir_stop();
}

/*
 * Stop redirecting command output to a variable.
 * Frees the allocated memory.
 */
    void
var_redir_stop(void)
{
    typval_T	tv;

    if (redir_lval != NULL)
    {
	/* If there was no error: assign the text to the variable. */
	if (redir_endp != NULL)
	{
	    ga_append(&redir_ga, NUL);  /* Append the trailing NUL. */
	    tv.v_type = VAR_STRING;
	    tv.vval.v_string = redir_ga.ga_data;
	    /* Call get_lval() again, if it's inside a Dict or List it may
	     * have changed. */
	    redir_endp = get_lval(redir_varname, NULL, redir_lval,
					FALSE, FALSE, 0, FNE_CHECK_START);
	    if (redir_endp != NULL && redir_lval->ll_name != NULL)
		set_var_lval(redir_lval, redir_endp, &tv, FALSE, (char_u *)".");
	    clear_lval(redir_lval);
	}

	/* free the collected output */
	vim_free(redir_ga.ga_data);
	redir_ga.ga_data = NULL;

	vim_free(redir_lval);
	redir_lval = NULL;
    }
    vim_free(redir_varname);
    redir_varname = NULL;
}

# if defined(FEAT_MBYTE) || defined(PROTO)
    int
eval_charconvert(
    char_u	*enc_from,
    char_u	*enc_to,
    char_u	*fname_from,
    char_u	*fname_to)
{
    int		err = FALSE;

    set_vim_var_string(VV_CC_FROM, enc_from, -1);
    set_vim_var_string(VV_CC_TO, enc_to, -1);
    set_vim_var_string(VV_FNAME_IN, fname_from, -1);
    set_vim_var_string(VV_FNAME_OUT, fname_to, -1);
    if (eval_to_bool(p_ccv, &err, NULL, FALSE))
	err = TRUE;
    set_vim_var_string(VV_CC_FROM, NULL, -1);
    set_vim_var_string(VV_CC_TO, NULL, -1);
    set_vim_var_string(VV_FNAME_IN, NULL, -1);
    set_vim_var_string(VV_FNAME_OUT, NULL, -1);

    if (err)
	return FAIL;
    return OK;
}
# endif

# if defined(FEAT_POSTSCRIPT) || defined(PROTO)
    int
eval_printexpr(char_u *fname, char_u *args)
{
    int		err = FALSE;

    set_vim_var_string(VV_FNAME_IN, fname, -1);
    set_vim_var_string(VV_CMDARG, args, -1);
    if (eval_to_bool(p_pexpr, &err, NULL, FALSE))
	err = TRUE;
    set_vim_var_string(VV_FNAME_IN, NULL, -1);
    set_vim_var_string(VV_CMDARG, NULL, -1);

    if (err)
    {
	mch_remove(fname);
	return FAIL;
    }
    return OK;
}
# endif

# if defined(FEAT_DIFF) || defined(PROTO)
    void
eval_diff(
    char_u	*origfile,
    char_u	*newfile,
    char_u	*outfile)
{
    int		err = FALSE;

    set_vim_var_string(VV_FNAME_IN, origfile, -1);
    set_vim_var_string(VV_FNAME_NEW, newfile, -1);
    set_vim_var_string(VV_FNAME_OUT, outfile, -1);
    (void)eval_to_bool(p_dex, &err, NULL, FALSE);
    set_vim_var_string(VV_FNAME_IN, NULL, -1);
    set_vim_var_string(VV_FNAME_NEW, NULL, -1);
    set_vim_var_string(VV_FNAME_OUT, NULL, -1);
}

    void
eval_patch(
    char_u	*origfile,
    char_u	*difffile,
    char_u	*outfile)
{
    int		err;

    set_vim_var_string(VV_FNAME_IN, origfile, -1);
    set_vim_var_string(VV_FNAME_DIFF, difffile, -1);
    set_vim_var_string(VV_FNAME_OUT, outfile, -1);
    (void)eval_to_bool(p_pex, &err, NULL, FALSE);
    set_vim_var_string(VV_FNAME_IN, NULL, -1);
    set_vim_var_string(VV_FNAME_DIFF, NULL, -1);
    set_vim_var_string(VV_FNAME_OUT, NULL, -1);
}
# endif

/*
 * Top level evaluation function, returning a boolean.
 * Sets "error" to TRUE if there was an error.
 * Return TRUE or FALSE.
 */
    int
eval_to_bool(
    char_u	*arg,
    int		*error,
    char_u	**nextcmd,
    int		skip)	    /* only parse, don't execute */
{
    typval_T	tv;
    int		retval = FALSE;

    if (skip)
	++emsg_skip;
    if (eval0(arg, &tv, nextcmd, !skip) == FAIL)
	*error = TRUE;
    else
    {
	*error = FALSE;
	if (!skip)
	{
	    retval = (get_tv_number_chk(&tv, error) != 0);
	    clear_tv(&tv);
	}
    }
    if (skip)
	--emsg_skip;

    return retval;
}

/*
 * Top level evaluation function, returning a string.  If "skip" is TRUE,
 * only parsing to "nextcmd" is done, without reporting errors.  Return
 * pointer to allocated memory, or NULL for failure or when "skip" is TRUE.
 */
    char_u *
eval_to_string_skip(
    char_u	*arg,
    char_u	**nextcmd,
    int		skip)	    /* only parse, don't execute */
{
    typval_T	tv;
    char_u	*retval;

    if (skip)
	++emsg_skip;
    if (eval0(arg, &tv, nextcmd, !skip) == FAIL || skip)
	retval = NULL;
    else
    {
	retval = vim_strsave(get_tv_string(&tv));
	clear_tv(&tv);
    }
    if (skip)
	--emsg_skip;

    return retval;
}

/*
 * Skip over an expression at "*pp".
 * Return FAIL for an error, OK otherwise.
 */
    int
skip_expr(char_u **pp)
{
    typval_T	rettv;

    *pp = skipwhite(*pp);
    return eval1(pp, &rettv, FALSE);
}

/*
 * Top level evaluation function, returning a string.
 * When "convert" is TRUE convert a List into a sequence of lines and convert
 * a Float to a String.
 * Return pointer to allocated memory, or NULL for failure.
 */
    char_u *
eval_to_string(
    char_u	*arg,
    char_u	**nextcmd,
    int		convert)
{
    typval_T	tv;
    char_u	*retval;
    garray_T	ga;
#ifdef FEAT_FLOAT
    char_u	numbuf[NUMBUFLEN];
#endif

    if (eval0(arg, &tv, nextcmd, TRUE) == FAIL)
	retval = NULL;
    else
    {
	if (convert && tv.v_type == VAR_LIST)
	{
	    ga_init2(&ga, (int)sizeof(char), 80);
	    if (tv.vval.v_list != NULL)
	    {
		list_join(&ga, tv.vval.v_list, (char_u *)"\n", TRUE, 0);
		if (tv.vval.v_list->lv_len > 0)
		    ga_append(&ga, NL);
	    }
	    ga_append(&ga, NUL);
	    retval = (char_u *)ga.ga_data;
	}
#ifdef FEAT_FLOAT
	else if (convert && tv.v_type == VAR_FLOAT)
	{
	    vim_snprintf((char *)numbuf, NUMBUFLEN, "%g", tv.vval.v_float);
	    retval = vim_strsave(numbuf);
	}
#endif
	else
	    retval = vim_strsave(get_tv_string(&tv));
	clear_tv(&tv);
    }

    return retval;
}

/*
 * Call eval_to_string() without using current local variables and using
 * textlock.  When "use_sandbox" is TRUE use the sandbox.
 */
    char_u *
eval_to_string_safe(
    char_u	*arg,
    char_u	**nextcmd,
    int		use_sandbox)
{
    char_u	*retval;
    void	*save_funccalp;

    save_funccalp = save_funccal();
    if (use_sandbox)
	++sandbox;
    ++textlock;
    retval = eval_to_string(arg, nextcmd, FALSE);
    if (use_sandbox)
	--sandbox;
    --textlock;
    restore_funccal(save_funccalp);
    return retval;
}

/*
 * Top level evaluation function, returning a number.
 * Evaluates "expr" silently.
 * Returns -1 for an error.
 */
    int
eval_to_number(char_u *expr)
{
    typval_T	rettv;
    int		retval;
    char_u	*p = skipwhite(expr);

    ++emsg_off;

    if (eval1(&p, &rettv, TRUE) == FAIL)
	retval = -1;
    else
    {
	retval = get_tv_number_chk(&rettv, NULL);
	clear_tv(&rettv);
    }
    --emsg_off;

    return retval;
}

/*
 * Prepare v: variable "idx" to be used.
 * Save the current typeval in "save_tv".
 * When not used yet add the variable to the v: hashtable.
 */
    static void
prepare_vimvar(int idx, typval_T *save_tv)
{
    *save_tv = vimvars[idx].vv_tv;
    if (vimvars[idx].vv_type == VAR_UNKNOWN)
	hash_add(&vimvarht, vimvars[idx].vv_di.di_key);
}

/*
 * Restore v: variable "idx" to typeval "save_tv".
 * When no longer defined, remove the variable from the v: hashtable.
 */
    static void
restore_vimvar(int idx, typval_T *save_tv)
{
    hashitem_T	*hi;

    vimvars[idx].vv_tv = *save_tv;
    if (vimvars[idx].vv_type == VAR_UNKNOWN)
    {
	hi = hash_find(&vimvarht, vimvars[idx].vv_di.di_key);
	if (HASHITEM_EMPTY(hi))
	    EMSG2(_(e_intern2), "restore_vimvar()");
	else
	    hash_remove(&vimvarht, hi);
    }
}

#if defined(FEAT_SPELL) || defined(PROTO)
/*
 * Evaluate an expression to a list with suggestions.
 * For the "expr:" part of 'spellsuggest'.
 * Returns NULL when there is an error.
 */
    list_T *
eval_spell_expr(char_u *badword, char_u *expr)
{
    typval_T	save_val;
    typval_T	rettv;
    list_T	*list = NULL;
    char_u	*p = skipwhite(expr);

    /* Set "v:val" to the bad word. */
    prepare_vimvar(VV_VAL, &save_val);
    vimvars[VV_VAL].vv_type = VAR_STRING;
    vimvars[VV_VAL].vv_str = badword;
    if (p_verbose == 0)
	++emsg_off;

    if (eval1(&p, &rettv, TRUE) == OK)
    {
	if (rettv.v_type != VAR_LIST)
	    clear_tv(&rettv);
	else
	    list = rettv.vval.v_list;
    }

    if (p_verbose == 0)
	--emsg_off;
    restore_vimvar(VV_VAL, &save_val);

    return list;
}

/*
 * "list" is supposed to contain two items: a word and a number.  Return the
 * word in "pp" and the number as the return value.
 * Return -1 if anything isn't right.
 * Used to get the good word and score from the eval_spell_expr() result.
 */
    int
get_spellword(list_T *list, char_u **pp)
{
    listitem_T	*li;

    li = list->lv_first;
    if (li == NULL)
	return -1;
    *pp = get_tv_string(&li->li_tv);

    li = li->li_next;
    if (li == NULL)
	return -1;
    return get_tv_number(&li->li_tv);
}
#endif

/*
 * Top level evaluation function.
 * Returns an allocated typval_T with the result.
 * Returns NULL when there is an error.
 */
    typval_T *
eval_expr(char_u *arg, char_u **nextcmd)
{
    typval_T	*tv;

    tv = (typval_T *)alloc(sizeof(typval_T));
    if (tv != NULL && eval0(arg, tv, nextcmd, TRUE) == FAIL)
    {
	vim_free(tv);
	tv = NULL;
    }

    return tv;
}


/*
 * Call some vimL function and return the result in "*rettv".
 * Uses argv[argc] for the function arguments.  Only Number and String
 * arguments are currently supported.
 * Returns OK or FAIL.
 */
    int
call_vim_function(
    char_u      *func,
    int		argc,
    char_u      **argv,
    int		safe,		/* use the sandbox */
    int		str_arg_only,	/* all arguments are strings */
    typval_T	*rettv)
{
    typval_T	*argvars;
    long	n;
    int		len;
    int		i;
    int		doesrange;
    void	*save_funccalp = NULL;
    int		ret;

    argvars = (typval_T *)alloc((unsigned)((argc + 1) * sizeof(typval_T)));
    if (argvars == NULL)
	return FAIL;

    for (i = 0; i < argc; i++)
    {
	/* Pass a NULL or empty argument as an empty string */
	if (argv[i] == NULL || *argv[i] == NUL)
	{
	    argvars[i].v_type = VAR_STRING;
	    argvars[i].vval.v_string = (char_u *)"";
	    continue;
	}

	if (str_arg_only)
	    len = 0;
	else
	    /* Recognize a number argument, the others must be strings. */
	    vim_str2nr(argv[i], NULL, &len, STR2NR_ALL, &n, NULL, 0);
	if (len != 0 && len == (int)STRLEN(argv[i]))
	{
	    argvars[i].v_type = VAR_NUMBER;
	    argvars[i].vval.v_number = n;
	}
	else
	{
	    argvars[i].v_type = VAR_STRING;
	    argvars[i].vval.v_string = argv[i];
	}
    }

    if (safe)
    {
	save_funccalp = save_funccal();
	++sandbox;
    }

    rettv->v_type = VAR_UNKNOWN;		/* clear_tv() uses this */
    ret = call_func(func, (int)STRLEN(func), rettv, argc, argvars,
		    curwin->w_cursor.lnum, curwin->w_cursor.lnum,
		    &doesrange, TRUE, NULL);
    if (safe)
    {
	--sandbox;
	restore_funccal(save_funccalp);
    }
    vim_free(argvars);

    if (ret == FAIL)
	clear_tv(rettv);

    return ret;
}

/*
 * Call vimL function "func" and return the result as a number.
 * Returns -1 when calling the function fails.
 * Uses argv[argc] for the function arguments.
 */
    long
call_func_retnr(
    char_u      *func,
    int		argc,
    char_u      **argv,
    int		safe)		/* use the sandbox */
{
    typval_T	rettv;
    long	retval;

    /* All arguments are passed as strings, no conversion to number. */
    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
	return -1;

    retval = get_tv_number_chk(&rettv, NULL);
    clear_tv(&rettv);
    return retval;
}

#if (defined(FEAT_USR_CMDS) && defined(FEAT_CMDL_COMPL)) \
	|| defined(FEAT_COMPL_FUNC) || defined(PROTO)

# if (defined(FEAT_USR_CMDS) && defined(FEAT_CMDL_COMPL)) || defined(PROTO)
/*
 * Call vimL function "func" and return the result as a string.
 * Returns NULL when calling the function fails.
 * Uses argv[argc] for the function arguments.
 */
    void *
call_func_retstr(
    char_u      *func,
    int		argc,
    char_u      **argv,
    int		safe)		/* use the sandbox */
{
    typval_T	rettv;
    char_u	*retval;

    /* All arguments are passed as strings, no conversion to number. */
    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
	return NULL;

    retval = vim_strsave(get_tv_string(&rettv));
    clear_tv(&rettv);
    return retval;
}
# endif

/*
 * Call vimL function "func" and return the result as a List.
 * Uses argv[argc] for the function arguments.
 * Returns NULL when there is something wrong.
 */
    void *
call_func_retlist(
    char_u      *func,
    int		argc,
    char_u      **argv,
    int		safe)		/* use the sandbox */
{
    typval_T	rettv;

    /* All arguments are passed as strings, no conversion to number. */
    if (call_vim_function(func, argc, argv, safe, TRUE, &rettv) == FAIL)
	return NULL;

    if (rettv.v_type != VAR_LIST)
    {
	clear_tv(&rettv);
	return NULL;
    }

    return rettv.vval.v_list;
}
#endif

/*
 * Save the current function call pointer, and set it to NULL.
 * Used when executing autocommands and for ":source".
 */
    void *
save_funccal(void)
{
    funccall_T *fc = current_funccal;

    current_funccal = NULL;
    return (void *)fc;
}

    void
restore_funccal(void *vfc)
{
    funccall_T *fc = (funccall_T *)vfc;

    current_funccal = fc;
}

#if defined(FEAT_PROFILE) || defined(PROTO)
/*
 * Prepare profiling for entering a child or something else that is not
 * counted for the script/function itself.
 * Should always be called in pair with prof_child_exit().
 */
    void
prof_child_enter(
    proftime_T *tm)	/* place to store waittime */
{
    funccall_T *fc = current_funccal;

    if (fc != NULL && fc->func->uf_profiling)
	profile_start(&fc->prof_child);
    script_prof_save(tm);
}

/*
 * Take care of time spent in a child.
 * Should always be called after prof_child_enter().
 */
    void
prof_child_exit(
    proftime_T *tm)	/* where waittime was stored */
{
    funccall_T *fc = current_funccal;

    if (fc != NULL && fc->func->uf_profiling)
    {
	profile_end(&fc->prof_child);
	profile_sub_wait(tm, &fc->prof_child); /* don't count waiting time */
	profile_add(&fc->func->uf_tm_children, &fc->prof_child);
	profile_add(&fc->func->uf_tml_children, &fc->prof_child);
    }
    script_prof_restore(tm);
}
#endif


#ifdef FEAT_FOLDING
/*
 * Evaluate 'foldexpr'.  Returns the foldlevel, and any character preceding
 * it in "*cp".  Doesn't give error messages.
 */
    int
eval_foldexpr(char_u *arg, int *cp)
{
    typval_T	tv;
    int		retval;
    char_u	*s;
    int		use_sandbox = was_set_insecurely((char_u *)"foldexpr",
								   OPT_LOCAL);

    ++emsg_off;
    if (use_sandbox)
	++sandbox;
    ++textlock;
    *cp = NUL;
    if (eval0(arg, &tv, NULL, TRUE) == FAIL)
	retval = 0;
    else
    {
	/* If the result is a number, just return the number. */
	if (tv.v_type == VAR_NUMBER)
	    retval = tv.vval.v_number;
	else if (tv.v_type != VAR_STRING || tv.vval.v_string == NULL)
	    retval = 0;
	else
	{
	    /* If the result is a string, check if there is a non-digit before
	     * the number. */
	    s = tv.vval.v_string;
	    if (!VIM_ISDIGIT(*s) && *s != '-')
		*cp = *s++;
	    retval = atol((char *)s);
	}
	clear_tv(&tv);
    }
    --emsg_off;
    if (use_sandbox)
	--sandbox;
    --textlock;

    return retval;
}
#endif

/*
 * ":let"			list all variable values
 * ":let var1 var2"		list variable values
 * ":let var = expr"		assignment command.
 * ":let var += expr"		assignment command.
 * ":let var -= expr"		assignment command.
 * ":let var .= expr"		assignment command.
 * ":let [var1, var2] = expr"	unpack list.
 */
    void
ex_let(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    char_u	*expr = NULL;
    typval_T	rettv;
    int		i;
    int		var_count = 0;
    int		semicolon = 0;
    char_u	op[2];
    char_u	*argend;
    int		first = TRUE;

    argend = skip_var_list(arg, &var_count, &semicolon);
    if (argend == NULL)
	return;
    if (argend > arg && argend[-1] == '.')  /* for var.='str' */
	--argend;
    expr = skipwhite(argend);
    if (*expr != '=' && !(vim_strchr((char_u *)"+-.", *expr) != NULL
			  && expr[1] == '='))
    {
	/*
	 * ":let" without "=": list variables
	 */
	if (*arg == '[')
	    EMSG(_(e_invarg));
	else if (!ends_excmd(*arg))
	    /* ":let var1 var2" */
	    arg = list_arg_vars(eap, arg, &first);
	else if (!eap->skip)
	{
	    /* ":let" */
	    list_glob_vars(&first);
	    list_buf_vars(&first);
	    list_win_vars(&first);
#ifdef FEAT_WINDOWS
	    list_tab_vars(&first);
#endif
	    list_script_vars(&first);
	    list_func_vars(&first);
	    list_vim_vars(&first);
	}
	eap->nextcmd = check_nextcmd(arg);
    }
    else
    {
	op[0] = '=';
	op[1] = NUL;
	if (*expr != '=')
	{
	    if (vim_strchr((char_u *)"+-.", *expr) != NULL)
		op[0] = *expr;   /* +=, -= or .= */
	    expr = skipwhite(expr + 2);
	}
	else
	    expr = skipwhite(expr + 1);

	if (eap->skip)
	    ++emsg_skip;
	i = eval0(expr, &rettv, &eap->nextcmd, !eap->skip);
	if (eap->skip)
	{
	    if (i != FAIL)
		clear_tv(&rettv);
	    --emsg_skip;
	}
	else if (i != FAIL)
	{
	    (void)ex_let_vars(eap->arg, &rettv, FALSE, semicolon, var_count,
									  op);
	    clear_tv(&rettv);
	}
    }
}

/*
 * Assign the typevalue "tv" to the variable or variables at "arg_start".
 * Handles both "var" with any type and "[var, var; var]" with a list type.
 * When "nextchars" is not NULL it points to a string with characters that
 * must appear after the variable(s).  Use "+", "-" or "." for add, subtract
 * or concatenate.
 * Returns OK or FAIL;
 */
    static int
ex_let_vars(
    char_u	*arg_start,
    typval_T	*tv,
    int		copy,		/* copy values from "tv", don't move */
    int		semicolon,	/* from skip_var_list() */
    int		var_count,	/* from skip_var_list() */
    char_u	*nextchars)
{
    char_u	*arg = arg_start;
    list_T	*l;
    int		i;
    listitem_T	*item;
    typval_T	ltv;

    if (*arg != '[')
    {
	/*
	 * ":let var = expr" or ":for var in list"
	 */
	if (ex_let_one(arg, tv, copy, nextchars, nextchars) == NULL)
	    return FAIL;
	return OK;
    }

    /*
     * ":let [v1, v2] = list" or ":for [v1, v2] in listlist"
     */
    if (tv->v_type != VAR_LIST || (l = tv->vval.v_list) == NULL)
    {
	EMSG(_(e_listreq));
	return FAIL;
    }

    i = list_len(l);
    if (semicolon == 0 && var_count < i)
    {
	EMSG(_("E687: Less targets than List items"));
	return FAIL;
    }
    if (var_count - semicolon > i)
    {
	EMSG(_("E688: More targets than List items"));
	return FAIL;
    }

    item = l->lv_first;
    while (*arg != ']')
    {
	arg = skipwhite(arg + 1);
	arg = ex_let_one(arg, &item->li_tv, TRUE, (char_u *)",;]", nextchars);
	item = item->li_next;
	if (arg == NULL)
	    return FAIL;

	arg = skipwhite(arg);
	if (*arg == ';')
	{
	    /* Put the rest of the list (may be empty) in the var after ';'.
	     * Create a new list for this. */
	    l = list_alloc();
	    if (l == NULL)
		return FAIL;
	    while (item != NULL)
	    {
		list_append_tv(l, &item->li_tv);
		item = item->li_next;
	    }

	    ltv.v_type = VAR_LIST;
	    ltv.v_lock = 0;
	    ltv.vval.v_list = l;
	    l->lv_refcount = 1;

	    arg = ex_let_one(skipwhite(arg + 1), &ltv, FALSE,
						    (char_u *)"]", nextchars);
	    clear_tv(&ltv);
	    if (arg == NULL)
		return FAIL;
	    break;
	}
	else if (*arg != ',' && *arg != ']')
	{
	    EMSG2(_(e_intern2), "ex_let_vars()");
	    return FAIL;
	}
    }

    return OK;
}

/*
 * Skip over assignable variable "var" or list of variables "[var, var]".
 * Used for ":let varvar = expr" and ":for varvar in expr".
 * For "[var, var]" increment "*var_count" for each variable.
 * for "[var, var; var]" set "semicolon".
 * Return NULL for an error.
 */
    static char_u *
skip_var_list(
    char_u	*arg,
    int		*var_count,
    int		*semicolon)
{
    char_u	*p, *s;

    if (*arg == '[')
    {
	/* "[var, var]": find the matching ']'. */
	p = arg;
	for (;;)
	{
	    p = skipwhite(p + 1);	/* skip whites after '[', ';' or ',' */
	    s = skip_var_one(p);
	    if (s == p)
	    {
		EMSG2(_(e_invarg2), p);
		return NULL;
	    }
	    ++*var_count;

	    p = skipwhite(s);
	    if (*p == ']')
		break;
	    else if (*p == ';')
	    {
		if (*semicolon == 1)
		{
		    EMSG(_("Double ; in list of variables"));
		    return NULL;
		}
		*semicolon = 1;
	    }
	    else if (*p != ',')
	    {
		EMSG2(_(e_invarg2), p);
		return NULL;
	    }
	}
	return p + 1;
    }
    else
	return skip_var_one(arg);
}

/*
 * Skip one (assignable) variable name, including @r, $VAR, &option, d.key,
 * l[idx].
 */
    static char_u *
skip_var_one(char_u *arg)
{
    if (*arg == '@' && arg[1] != NUL)
	return arg + 2;
    return find_name_end(*arg == '$' || *arg == '&' ? arg + 1 : arg,
				   NULL, NULL, FNE_INCL_BR | FNE_CHECK_START);
}

/*
 * List variables for hashtab "ht" with prefix "prefix".
 * If "empty" is TRUE also list NULL strings as empty strings.
 */
    static void
list_hashtable_vars(
    hashtab_T	*ht,
    char_u	*prefix,
    int		empty,
    int		*first)
{
    hashitem_T	*hi;
    dictitem_T	*di;
    int		todo;

    todo = (int)ht->ht_used;
    for (hi = ht->ht_array; todo > 0 && !got_int; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    di = HI2DI(hi);
	    if (empty || di->di_tv.v_type != VAR_STRING
					   || di->di_tv.vval.v_string != NULL)
		list_one_var(di, prefix, first);
	}
    }
}

/*
 * List global variables.
 */
    static void
list_glob_vars(int *first)
{
    list_hashtable_vars(&globvarht, (char_u *)"", TRUE, first);
}

/*
 * List buffer variables.
 */
    static void
list_buf_vars(int *first)
{
    char_u	numbuf[NUMBUFLEN];

    list_hashtable_vars(&curbuf->b_vars->dv_hashtab, (char_u *)"b:",
								 TRUE, first);

    sprintf((char *)numbuf, "%ld", (long)curbuf->b_changedtick);
    list_one_var_a((char_u *)"b:", (char_u *)"changedtick", VAR_NUMBER,
							       numbuf, first);
}

/*
 * List window variables.
 */
    static void
list_win_vars(int *first)
{
    list_hashtable_vars(&curwin->w_vars->dv_hashtab,
						 (char_u *)"w:", TRUE, first);
}

#ifdef FEAT_WINDOWS
/*
 * List tab page variables.
 */
    static void
list_tab_vars(int *first)
{
    list_hashtable_vars(&curtab->tp_vars->dv_hashtab,
						 (char_u *)"t:", TRUE, first);
}
#endif

/*
 * List Vim variables.
 */
    static void
list_vim_vars(int *first)
{
    list_hashtable_vars(&vimvarht, (char_u *)"v:", FALSE, first);
}

/*
 * List script-local variables, if there is a script.
 */
    static void
list_script_vars(int *first)
{
    if (current_SID > 0 && current_SID <= ga_scripts.ga_len)
	list_hashtable_vars(&SCRIPT_VARS(current_SID),
						(char_u *)"s:", FALSE, first);
}

/*
 * List function variables, if there is a function.
 */
    static void
list_func_vars(int *first)
{
    if (current_funccal != NULL)
	list_hashtable_vars(&current_funccal->l_vars.dv_hashtab,
						(char_u *)"l:", FALSE, first);
}

/*
 * List variables in "arg".
 */
    static char_u *
list_arg_vars(exarg_T *eap, char_u *arg, int *first)
{
    int		error = FALSE;
    int		len;
    char_u	*name;
    char_u	*name_start;
    char_u	*arg_subsc;
    char_u	*tofree;
    typval_T    tv;

    while (!ends_excmd(*arg) && !got_int)
    {
	if (error || eap->skip)
	{
	    arg = find_name_end(arg, NULL, NULL, FNE_INCL_BR | FNE_CHECK_START);
	    if (!vim_iswhite(*arg) && !ends_excmd(*arg))
	    {
		emsg_severe = TRUE;
		EMSG(_(e_trailing));
		break;
	    }
	}
	else
	{
	    /* get_name_len() takes care of expanding curly braces */
	    name_start = name = arg;
	    len = get_name_len(&arg, &tofree, TRUE, TRUE);
	    if (len <= 0)
	    {
		/* This is mainly to keep test 49 working: when expanding
		 * curly braces fails overrule the exception error message. */
		if (len < 0 && !aborting())
		{
		    emsg_severe = TRUE;
		    EMSG2(_(e_invarg2), arg);
		    break;
		}
		error = TRUE;
	    }
	    else
	    {
		if (tofree != NULL)
		    name = tofree;
		if (get_var_tv(name, len, &tv, NULL, TRUE, FALSE) == FAIL)
		    error = TRUE;
		else
		{
		    /* handle d.key, l[idx], f(expr) */
		    arg_subsc = arg;
		    if (handle_subscript(&arg, &tv, TRUE, TRUE) == FAIL)
			error = TRUE;
		    else
		    {
			if (arg == arg_subsc && len == 2 && name[1] == ':')
			{
			    switch (*name)
			    {
				case 'g': list_glob_vars(first); break;
				case 'b': list_buf_vars(first); break;
				case 'w': list_win_vars(first); break;
#ifdef FEAT_WINDOWS
				case 't': list_tab_vars(first); break;
#endif
				case 'v': list_vim_vars(first); break;
				case 's': list_script_vars(first); break;
				case 'l': list_func_vars(first); break;
				default:
					  EMSG2(_("E738: Can't list variables for %s"), name);
			    }
			}
			else
			{
			    char_u	numbuf[NUMBUFLEN];
			    char_u	*tf;
			    int		c;
			    char_u	*s;

			    s = echo_string(&tv, &tf, numbuf, 0);
			    c = *arg;
			    *arg = NUL;
			    list_one_var_a((char_u *)"",
				    arg == arg_subsc ? name : name_start,
				    tv.v_type,
				    s == NULL ? (char_u *)"" : s,
				    first);
			    *arg = c;
			    vim_free(tf);
			}
			clear_tv(&tv);
		    }
		}
	    }

	    vim_free(tofree);
	}

	arg = skipwhite(arg);
    }

    return arg;
}

/*
 * Set one item of ":let var = expr" or ":let [v1, v2] = list" to its value.
 * Returns a pointer to the char just after the var name.
 * Returns NULL if there is an error.
 */
    static char_u *
ex_let_one(
    char_u	*arg,		/* points to variable name */
    typval_T	*tv,		/* value to assign to variable */
    int		copy,		/* copy value from "tv" */
    char_u	*endchars,	/* valid chars after variable name  or NULL */
    char_u	*op)		/* "+", "-", "."  or NULL*/
{
    int		c1;
    char_u	*name;
    char_u	*p;
    char_u	*arg_end = NULL;
    int		len;
    int		opt_flags;
    char_u	*tofree = NULL;

    /*
     * ":let $VAR = expr": Set environment variable.
     */
    if (*arg == '$')
    {
	/* Find the end of the name. */
	++arg;
	name = arg;
	len = get_env_len(&arg);
	if (len == 0)
	    EMSG2(_(e_invarg2), name - 1);
	else
	{
	    if (op != NULL && (*op == '+' || *op == '-'))
		EMSG2(_(e_letwrong), op);
	    else if (endchars != NULL
			     && vim_strchr(endchars, *skipwhite(arg)) == NULL)
		EMSG(_(e_letunexp));
	    else if (!check_secure())
	    {
		c1 = name[len];
		name[len] = NUL;
		p = get_tv_string_chk(tv);
		if (p != NULL && op != NULL && *op == '.')
		{
		    int	    mustfree = FALSE;
		    char_u  *s = vim_getenv(name, &mustfree);

		    if (s != NULL)
		    {
			p = tofree = concat_str(s, p);
			if (mustfree)
			    vim_free(s);
		    }
		}
		if (p != NULL)
		{
		    vim_setenv(name, p);
		    if (STRICMP(name, "HOME") == 0)
			init_homedir();
		    else if (didset_vim && STRICMP(name, "VIM") == 0)
			didset_vim = FALSE;
		    else if (didset_vimruntime
					&& STRICMP(name, "VIMRUNTIME") == 0)
			didset_vimruntime = FALSE;
		    arg_end = arg;
		}
		name[len] = c1;
		vim_free(tofree);
	    }
	}
    }

    /*
     * ":let &option = expr": Set option value.
     * ":let &l:option = expr": Set local option value.
     * ":let &g:option = expr": Set global option value.
     */
    else if (*arg == '&')
    {
	/* Find the end of the name. */
	p = find_option_end(&arg, &opt_flags);
	if (p == NULL || (endchars != NULL
			      && vim_strchr(endchars, *skipwhite(p)) == NULL))
	    EMSG(_(e_letunexp));
	else
	{
	    long	n;
	    int		opt_type;
	    long	numval;
	    char_u	*stringval = NULL;
	    char_u	*s;

	    c1 = *p;
	    *p = NUL;

	    n = get_tv_number(tv);
	    s = get_tv_string_chk(tv);	    /* != NULL if number or string */
	    if (s != NULL && op != NULL && *op != '=')
	    {
		opt_type = get_option_value(arg, &numval,
						       &stringval, opt_flags);
		if ((opt_type == 1 && *op == '.')
			|| (opt_type == 0 && *op != '.'))
		    EMSG2(_(e_letwrong), op);
		else
		{
		    if (opt_type == 1)  /* number */
		    {
			if (*op == '+')
			    n = numval + n;
			else
			    n = numval - n;
		    }
		    else if (opt_type == 0 && stringval != NULL) /* string */
		    {
			s = concat_str(stringval, s);
			vim_free(stringval);
			stringval = s;
		    }
		}
	    }
	    if (s != NULL)
	    {
		set_option_value(arg, n, s, opt_flags);
		arg_end = p;
	    }
	    *p = c1;
	    vim_free(stringval);
	}
    }

    /*
     * ":let @r = expr": Set register contents.
     */
    else if (*arg == '@')
    {
	++arg;
	if (op != NULL && (*op == '+' || *op == '-'))
	    EMSG2(_(e_letwrong), op);
	else if (endchars != NULL
			 && vim_strchr(endchars, *skipwhite(arg + 1)) == NULL)
	    EMSG(_(e_letunexp));
	else
	{
	    char_u	*ptofree = NULL;
	    char_u	*s;

	    p = get_tv_string_chk(tv);
	    if (p != NULL && op != NULL && *op == '.')
	    {
		s = get_reg_contents(*arg == '@' ? '"' : *arg, GREG_EXPR_SRC);
		if (s != NULL)
		{
		    p = ptofree = concat_str(s, p);
		    vim_free(s);
		}
	    }
	    if (p != NULL)
	    {
		write_reg_contents(*arg == '@' ? '"' : *arg, p, -1, FALSE);
		arg_end = arg + 1;
	    }
	    vim_free(ptofree);
	}
    }

    /*
     * ":let var = expr": Set internal variable.
     * ":let {expr} = expr": Idem, name made with curly braces
     */
    else if (eval_isnamec1(*arg) || *arg == '{')
    {
	lval_T	lv;

	p = get_lval(arg, tv, &lv, FALSE, FALSE, 0, FNE_CHECK_START);
	if (p != NULL && lv.ll_name != NULL)
	{
	    if (endchars != NULL && vim_strchr(endchars, *skipwhite(p)) == NULL)
		EMSG(_(e_letunexp));
	    else
	    {
		set_var_lval(&lv, p, tv, copy, op);
		arg_end = p;
	    }
	}
	clear_lval(&lv);
    }

    else
	EMSG2(_(e_invarg2), arg);

    return arg_end;
}

/*
 * If "arg" is equal to "b:changedtick" give an error and return TRUE.
 */
    static int
check_changedtick(char_u *arg)
{
    if (STRNCMP(arg, "b:changedtick", 13) == 0 && !eval_isnamec(arg[13]))
    {
	EMSG2(_(e_readonlyvar), arg);
	return TRUE;
    }
    return FALSE;
}

/*
 * Get an lval: variable, Dict item or List item that can be assigned a value
 * to: "name", "na{me}", "name[expr]", "name[expr:expr]", "name[expr][expr]",
 * "name.key", "name.key[expr]" etc.
 * Indexing only works if "name" is an existing List or Dictionary.
 * "name" points to the start of the name.
 * If "rettv" is not NULL it points to the value to be assigned.
 * "unlet" is TRUE for ":unlet": slightly different behavior when something is
 * wrong; must end in space or cmd separator.
 *
 * flags:
 *  GLV_QUIET:       do not give error messages
 *  GLV_NO_AUTOLOAD: do not use script autoloading
 *
 * Returns a pointer to just after the name, including indexes.
 * When an evaluation error occurs "lp->ll_name" is NULL;
 * Returns NULL for a parsing error.  Still need to free items in "lp"!
 */
    static char_u *
get_lval(
    char_u	*name,
    typval_T	*rettv,
    lval_T	*lp,
    int		unlet,
    int		skip,
    int		flags,	    /* GLV_ values */
    int		fne_flags)  /* flags for find_name_end() */
{
    char_u	*p;
    char_u	*expr_start, *expr_end;
    int		cc;
    dictitem_T	*v;
    typval_T	var1;
    typval_T	var2;
    int		empty1 = FALSE;
    listitem_T	*ni;
    char_u	*key = NULL;
    int		len;
    hashtab_T	*ht;
    int		quiet = flags & GLV_QUIET;

    /* Clear everything in "lp". */
    vim_memset(lp, 0, sizeof(lval_T));

    if (skip)
    {
	/* When skipping just find the end of the name. */
	lp->ll_name = name;
	return find_name_end(name, NULL, NULL, FNE_INCL_BR | fne_flags);
    }

    /* Find the end of the name. */
    p = find_name_end(name, &expr_start, &expr_end, fne_flags);
    if (expr_start != NULL)
    {
	/* Don't expand the name when we already know there is an error. */
	if (unlet && !vim_iswhite(*p) && !ends_excmd(*p)
						    && *p != '[' && *p != '.')
	{
	    EMSG(_(e_trailing));
	    return NULL;
	}

	lp->ll_exp_name = make_expanded_name(name, expr_start, expr_end, p);
	if (lp->ll_exp_name == NULL)
	{
	    /* Report an invalid expression in braces, unless the
	     * expression evaluation has been cancelled due to an
	     * aborting error, an interrupt, or an exception. */
	    if (!aborting() && !quiet)
	    {
		emsg_severe = TRUE;
		EMSG2(_(e_invarg2), name);
		return NULL;
	    }
	}
	lp->ll_name = lp->ll_exp_name;
    }
    else
	lp->ll_name = name;

    /* Without [idx] or .key we are done. */
    if ((*p != '[' && *p != '.') || lp->ll_name == NULL)
	return p;

    cc = *p;
    *p = NUL;
    v = find_var(lp->ll_name, &ht, flags & GLV_NO_AUTOLOAD);
    if (v == NULL && !quiet)
	EMSG2(_(e_undefvar), lp->ll_name);
    *p = cc;
    if (v == NULL)
	return NULL;

    /*
     * Loop until no more [idx] or .key is following.
     */
    lp->ll_tv = &v->di_tv;
    while (*p == '[' || (*p == '.' && lp->ll_tv->v_type == VAR_DICT))
    {
	if (!(lp->ll_tv->v_type == VAR_LIST && lp->ll_tv->vval.v_list != NULL)
		&& !(lp->ll_tv->v_type == VAR_DICT
					   && lp->ll_tv->vval.v_dict != NULL))
	{
	    if (!quiet)
		EMSG(_("E689: Can only index a List or Dictionary"));
	    return NULL;
	}
	if (lp->ll_range)
	{
	    if (!quiet)
		EMSG(_("E708: [:] must come last"));
	    return NULL;
	}

	len = -1;
	if (*p == '.')
	{
	    key = p + 1;
	    for (len = 0; ASCII_ISALNUM(key[len]) || key[len] == '_'; ++len)
		;
	    if (len == 0)
	    {
		if (!quiet)
		    EMSG(_(e_emptykey));
		return NULL;
	    }
	    p = key + len;
	}
	else
	{
	    /* Get the index [expr] or the first index [expr: ]. */
	    p = skipwhite(p + 1);
	    if (*p == ':')
		empty1 = TRUE;
	    else
	    {
		empty1 = FALSE;
		if (eval1(&p, &var1, TRUE) == FAIL)	/* recursive! */
		    return NULL;
		if (get_tv_string_chk(&var1) == NULL)
		{
		    /* not a number or string */
		    clear_tv(&var1);
		    return NULL;
		}
	    }

	    /* Optionally get the second index [ :expr]. */
	    if (*p == ':')
	    {
		if (lp->ll_tv->v_type == VAR_DICT)
		{
		    if (!quiet)
			EMSG(_(e_dictrange));
		    if (!empty1)
			clear_tv(&var1);
		    return NULL;
		}
		if (rettv != NULL && (rettv->v_type != VAR_LIST
					       || rettv->vval.v_list == NULL))
		{
		    if (!quiet)
			EMSG(_("E709: [:] requires a List value"));
		    if (!empty1)
			clear_tv(&var1);
		    return NULL;
		}
		p = skipwhite(p + 1);
		if (*p == ']')
		    lp->ll_empty2 = TRUE;
		else
		{
		    lp->ll_empty2 = FALSE;
		    if (eval1(&p, &var2, TRUE) == FAIL)	/* recursive! */
		    {
			if (!empty1)
			    clear_tv(&var1);
			return NULL;
		    }
		    if (get_tv_string_chk(&var2) == NULL)
		    {
			/* not a number or string */
			if (!empty1)
			    clear_tv(&var1);
			clear_tv(&var2);
			return NULL;
		    }
		}
		lp->ll_range = TRUE;
	    }
	    else
		lp->ll_range = FALSE;

	    if (*p != ']')
	    {
		if (!quiet)
		    EMSG(_(e_missbrac));
		if (!empty1)
		    clear_tv(&var1);
		if (lp->ll_range && !lp->ll_empty2)
		    clear_tv(&var2);
		return NULL;
	    }

	    /* Skip to past ']'. */
	    ++p;
	}

	if (lp->ll_tv->v_type == VAR_DICT)
	{
	    if (len == -1)
	    {
		/* "[key]": get key from "var1" */
		key = get_tv_string(&var1);	/* is number or string */
		if (*key == NUL)
		{
		    if (!quiet)
			EMSG(_(e_emptykey));
		    clear_tv(&var1);
		    return NULL;
		}
	    }
	    lp->ll_list = NULL;
	    lp->ll_dict = lp->ll_tv->vval.v_dict;
	    lp->ll_di = dict_find(lp->ll_dict, key, len);

	    /* When assigning to a scope dictionary check that a function and
	     * variable name is valid (only variable name unless it is l: or
	     * g: dictionary). Disallow overwriting a builtin function. */
	    if (rettv != NULL && lp->ll_dict->dv_scope != 0)
	    {
		int prevval;
		int wrong;

		if (len != -1)
		{
		    prevval = key[len];
		    key[len] = NUL;
		}
		else
		    prevval = 0; /* avoid compiler warning */
		wrong = (lp->ll_dict->dv_scope == VAR_DEF_SCOPE
			       && rettv->v_type == VAR_FUNC
			       && var_check_func_name(key, lp->ll_di == NULL))
			|| !valid_varname(key);
		if (len != -1)
		    key[len] = prevval;
		if (wrong)
		    return NULL;
	    }

	    if (lp->ll_di == NULL)
	    {
		/* Can't add "v:" variable. */
		if (lp->ll_dict == &vimvardict)
		{
		    EMSG2(_(e_illvar), name);
		    return NULL;
		}

		/* Key does not exist in dict: may need to add it. */
		if (*p == '[' || *p == '.' || unlet)
		{
		    if (!quiet)
			EMSG2(_(e_dictkey), key);
		    if (len == -1)
			clear_tv(&var1);
		    return NULL;
		}
		if (len == -1)
		    lp->ll_newkey = vim_strsave(key);
		else
		    lp->ll_newkey = vim_strnsave(key, len);
		if (len == -1)
		    clear_tv(&var1);
		if (lp->ll_newkey == NULL)
		    p = NULL;
		break;
	    }
	    /* existing variable, need to check if it can be changed */
	    else if (var_check_ro(lp->ll_di->di_flags, name, FALSE))
		return NULL;

	    if (len == -1)
		clear_tv(&var1);
	    lp->ll_tv = &lp->ll_di->di_tv;
	}
	else
	{
	    /*
	     * Get the number and item for the only or first index of the List.
	     */
	    if (empty1)
		lp->ll_n1 = 0;
	    else
	    {
		lp->ll_n1 = get_tv_number(&var1);   /* is number or string */
		clear_tv(&var1);
	    }
	    lp->ll_dict = NULL;
	    lp->ll_list = lp->ll_tv->vval.v_list;
	    lp->ll_li = list_find(lp->ll_list, lp->ll_n1);
	    if (lp->ll_li == NULL)
	    {
		if (lp->ll_n1 < 0)
		{
		    lp->ll_n1 = 0;
		    lp->ll_li = list_find(lp->ll_list, lp->ll_n1);
		}
	    }
	    if (lp->ll_li == NULL)
	    {
		if (lp->ll_range && !lp->ll_empty2)
		    clear_tv(&var2);
		if (!quiet)
		    EMSGN(_(e_listidx), lp->ll_n1);
		return NULL;
	    }

	    /*
	     * May need to find the item or absolute index for the second
	     * index of a range.
	     * When no index given: "lp->ll_empty2" is TRUE.
	     * Otherwise "lp->ll_n2" is set to the second index.
	     */
	    if (lp->ll_range && !lp->ll_empty2)
	    {
		lp->ll_n2 = get_tv_number(&var2);   /* is number or string */
		clear_tv(&var2);
		if (lp->ll_n2 < 0)
		{
		    ni = list_find(lp->ll_list, lp->ll_n2);
		    if (ni == NULL)
		    {
			if (!quiet)
			    EMSGN(_(e_listidx), lp->ll_n2);
			return NULL;
		    }
		    lp->ll_n2 = list_idx_of_item(lp->ll_list, ni);
		}

		/* Check that lp->ll_n2 isn't before lp->ll_n1. */
		if (lp->ll_n1 < 0)
		    lp->ll_n1 = list_idx_of_item(lp->ll_list, lp->ll_li);
		if (lp->ll_n2 < lp->ll_n1)
		{
		    if (!quiet)
			EMSGN(_(e_listidx), lp->ll_n2);
		    return NULL;
		}
	    }

	    lp->ll_tv = &lp->ll_li->li_tv;
	}
    }

    return p;
}

/*
 * Clear lval "lp" that was filled by get_lval().
 */
    static void
clear_lval(lval_T *lp)
{
    vim_free(lp->ll_exp_name);
    vim_free(lp->ll_newkey);
}

/*
 * Set a variable that was parsed by get_lval() to "rettv".
 * "endp" points to just after the parsed name.
 * "op" is NULL, "+" for "+=", "-" for "-=", "." for ".=" or "=" for "=".
 */
    static void
set_var_lval(
    lval_T	*lp,
    char_u	*endp,
    typval_T	*rettv,
    int		copy,
    char_u	*op)
{
    int		cc;
    listitem_T	*ri;
    dictitem_T	*di;

    if (lp->ll_tv == NULL)
    {
	if (!check_changedtick(lp->ll_name))
	{
	    cc = *endp;
	    *endp = NUL;
	    if (op != NULL && *op != '=')
	    {
		typval_T tv;

		/* handle +=, -= and .= */
		di = NULL;
		if (get_var_tv(lp->ll_name, (int)STRLEN(lp->ll_name),
						 &tv, &di, TRUE, FALSE) == OK)
		{
		    if ((di == NULL
			   || (!var_check_ro(di->di_flags, lp->ll_name, FALSE)
			      && !tv_check_lock(di->di_tv.v_lock, lp->ll_name,
								      FALSE)))
			    && tv_op(&tv, rettv, op) == OK)
			set_var(lp->ll_name, &tv, FALSE);
		    clear_tv(&tv);
		}
	    }
	    else
		set_var(lp->ll_name, rettv, copy);
	    *endp = cc;
	}
    }
    else if (tv_check_lock(lp->ll_newkey == NULL
		? lp->ll_tv->v_lock
		: lp->ll_tv->vval.v_dict->dv_lock, lp->ll_name, FALSE))
	;
    else if (lp->ll_range)
    {
	listitem_T *ll_li = lp->ll_li;
	int ll_n1 = lp->ll_n1;

	/*
	 * Check whether any of the list items is locked
	 */
	for (ri = rettv->vval.v_list->lv_first; ri != NULL && ll_li != NULL; )
	{
	    if (tv_check_lock(ll_li->li_tv.v_lock, lp->ll_name, FALSE))
		return;
	    ri = ri->li_next;
	    if (ri == NULL || (!lp->ll_empty2 && lp->ll_n2 == ll_n1))
		break;
	    ll_li = ll_li->li_next;
	    ++ll_n1;
	}

	/*
	 * Assign the List values to the list items.
	 */
	for (ri = rettv->vval.v_list->lv_first; ri != NULL; )
	{
	    if (op != NULL && *op != '=')
		tv_op(&lp->ll_li->li_tv, &ri->li_tv, op);
	    else
	    {
		clear_tv(&lp->ll_li->li_tv);
		copy_tv(&ri->li_tv, &lp->ll_li->li_tv);
	    }
	    ri = ri->li_next;
	    if (ri == NULL || (!lp->ll_empty2 && lp->ll_n2 == lp->ll_n1))
		break;
	    if (lp->ll_li->li_next == NULL)
	    {
		/* Need to add an empty item. */
		if (list_append_number(lp->ll_list, 0) == FAIL)
		{
		    ri = NULL;
		    break;
		}
	    }
	    lp->ll_li = lp->ll_li->li_next;
	    ++lp->ll_n1;
	}
	if (ri != NULL)
	    EMSG(_("E710: List value has more items than target"));
	else if (lp->ll_empty2
		? (lp->ll_li != NULL && lp->ll_li->li_next != NULL)
		: lp->ll_n1 != lp->ll_n2)
	    EMSG(_("E711: List value has not enough items"));
    }
    else
    {
	/*
	 * Assign to a List or Dictionary item.
	 */
	if (lp->ll_newkey != NULL)
	{
	    if (op != NULL && *op != '=')
	    {
		EMSG2(_(e_letwrong), op);
		return;
	    }

	    /* Need to add an item to the Dictionary. */
	    di = dictitem_alloc(lp->ll_newkey);
	    if (di == NULL)
		return;
	    if (dict_add(lp->ll_tv->vval.v_dict, di) == FAIL)
	    {
		vim_free(di);
		return;
	    }
	    lp->ll_tv = &di->di_tv;
	}
	else if (op != NULL && *op != '=')
	{
	    tv_op(lp->ll_tv, rettv, op);
	    return;
	}
	else
	    clear_tv(lp->ll_tv);

	/*
	 * Assign the value to the variable or list item.
	 */
	if (copy)
	    copy_tv(rettv, lp->ll_tv);
	else
	{
	    *lp->ll_tv = *rettv;
	    lp->ll_tv->v_lock = 0;
	    init_tv(rettv);
	}
    }
}

/*
 * Handle "tv1 += tv2", "tv1 -= tv2" and "tv1 .= tv2"
 * Returns OK or FAIL.
 */
    static int
tv_op(typval_T *tv1, typval_T *tv2, char_u *op)
{
    long	n;
    char_u	numbuf[NUMBUFLEN];
    char_u	*s;

    /* Can't do anything with a Funcref, Dict, v:true on the right. */
    if (tv2->v_type != VAR_FUNC && tv2->v_type != VAR_DICT
						&& tv2->v_type != VAR_SPECIAL)
    {
	switch (tv1->v_type)
	{
	    case VAR_DICT:
	    case VAR_FUNC:
	    case VAR_SPECIAL:
	    case VAR_UNKNOWN:
		break;

	    case VAR_LIST:
		if (*op != '+' || tv2->v_type != VAR_LIST)
		    break;
		/* List += List */
		if (tv1->vval.v_list != NULL && tv2->vval.v_list != NULL)
		    list_extend(tv1->vval.v_list, tv2->vval.v_list, NULL);
		return OK;

	    case VAR_NUMBER:
	    case VAR_STRING:
		if (tv2->v_type == VAR_LIST)
		    break;
		if (*op == '+' || *op == '-')
		{
		    /* nr += nr  or  nr -= nr*/
		    n = get_tv_number(tv1);
#ifdef FEAT_FLOAT
		    if (tv2->v_type == VAR_FLOAT)
		    {
			float_T f = n;

			if (*op == '+')
			    f += tv2->vval.v_float;
			else
			    f -= tv2->vval.v_float;
			clear_tv(tv1);
			tv1->v_type = VAR_FLOAT;
			tv1->vval.v_float = f;
		    }
		    else
#endif
		    {
			if (*op == '+')
			    n += get_tv_number(tv2);
			else
			    n -= get_tv_number(tv2);
			clear_tv(tv1);
			tv1->v_type = VAR_NUMBER;
			tv1->vval.v_number = n;
		    }
		}
		else
		{
		    if (tv2->v_type == VAR_FLOAT)
			break;

		    /* str .= str */
		    s = get_tv_string(tv1);
		    s = concat_str(s, get_tv_string_buf(tv2, numbuf));
		    clear_tv(tv1);
		    tv1->v_type = VAR_STRING;
		    tv1->vval.v_string = s;
		}
		return OK;

#ifdef FEAT_FLOAT
	    case VAR_FLOAT:
		{
		    float_T f;

		    if (*op == '.' || (tv2->v_type != VAR_FLOAT
				    && tv2->v_type != VAR_NUMBER
				    && tv2->v_type != VAR_STRING))
			break;
		    if (tv2->v_type == VAR_FLOAT)
			f = tv2->vval.v_float;
		    else
			f = get_tv_number(tv2);
		    if (*op == '+')
			tv1->vval.v_float += f;
		    else
			tv1->vval.v_float -= f;
		}
		return OK;
#endif
	}
    }

    EMSG2(_(e_letwrong), op);
    return FAIL;
}

/*
 * Add a watcher to a list.
 */
    void
list_add_watch(list_T *l, listwatch_T *lw)
{
    lw->lw_next = l->lv_watch;
    l->lv_watch = lw;
}

/*
 * Remove a watcher from a list.
 * No warning when it isn't found...
 */
    void
list_rem_watch(list_T *l, listwatch_T *lwrem)
{
    listwatch_T	*lw, **lwp;

    lwp = &l->lv_watch;
    for (lw = l->lv_watch; lw != NULL; lw = lw->lw_next)
    {
	if (lw == lwrem)
	{
	    *lwp = lw->lw_next;
	    break;
	}
	lwp = &lw->lw_next;
    }
}

/*
 * Just before removing an item from a list: advance watchers to the next
 * item.
 */
    static void
list_fix_watch(list_T *l, listitem_T *item)
{
    listwatch_T	*lw;

    for (lw = l->lv_watch; lw != NULL; lw = lw->lw_next)
	if (lw->lw_item == item)
	    lw->lw_item = item->li_next;
}

/*
 * Evaluate the expression used in a ":for var in expr" command.
 * "arg" points to "var".
 * Set "*errp" to TRUE for an error, FALSE otherwise;
 * Return a pointer that holds the info.  Null when there is an error.
 */
    void *
eval_for_line(
    char_u	*arg,
    int		*errp,
    char_u	**nextcmdp,
    int		skip)
{
    forinfo_T	*fi;
    char_u	*expr;
    typval_T	tv;
    list_T	*l;

    *errp = TRUE;	/* default: there is an error */

    fi = (forinfo_T *)alloc_clear(sizeof(forinfo_T));
    if (fi == NULL)
	return NULL;

    expr = skip_var_list(arg, &fi->fi_varcount, &fi->fi_semicolon);
    if (expr == NULL)
	return fi;

    expr = skipwhite(expr);
    if (expr[0] != 'i' || expr[1] != 'n' || !vim_iswhite(expr[2]))
    {
	EMSG(_("E690: Missing \"in\" after :for"));
	return fi;
    }

    if (skip)
	++emsg_skip;
    if (eval0(skipwhite(expr + 2), &tv, nextcmdp, !skip) == OK)
    {
	*errp = FALSE;
	if (!skip)
	{
	    l = tv.vval.v_list;
	    if (tv.v_type != VAR_LIST || l == NULL)
	    {
		EMSG(_(e_listreq));
		clear_tv(&tv);
	    }
	    else
	    {
		/* No need to increment the refcount, it's already set for the
		 * list being used in "tv". */
		fi->fi_list = l;
		list_add_watch(l, &fi->fi_lw);
		fi->fi_lw.lw_item = l->lv_first;
	    }
	}
    }
    if (skip)
	--emsg_skip;

    return fi;
}

/*
 * Use the first item in a ":for" list.  Advance to the next.
 * Assign the values to the variable (list).  "arg" points to the first one.
 * Return TRUE when a valid item was found, FALSE when at end of list or
 * something wrong.
 */
    int
next_for_item(void *fi_void, char_u *arg)
{
    forinfo_T	*fi = (forinfo_T *)fi_void;
    int		result;
    listitem_T	*item;

    item = fi->fi_lw.lw_item;
    if (item == NULL)
	result = FALSE;
    else
    {
	fi->fi_lw.lw_item = item->li_next;
	result = (ex_let_vars(arg, &item->li_tv, TRUE,
			      fi->fi_semicolon, fi->fi_varcount, NULL) == OK);
    }
    return result;
}

/*
 * Free the structure used to store info used by ":for".
 */
    void
free_for_info(void *fi_void)
{
    forinfo_T    *fi = (forinfo_T *)fi_void;

    if (fi != NULL && fi->fi_list != NULL)
    {
	list_rem_watch(fi->fi_list, &fi->fi_lw);
	list_unref(fi->fi_list);
    }
    vim_free(fi);
}

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)

    void
set_context_for_expression(
    expand_T	*xp,
    char_u	*arg,
    cmdidx_T	cmdidx)
{
    int		got_eq = FALSE;
    int		c;
    char_u	*p;

    if (cmdidx == CMD_let)
    {
	xp->xp_context = EXPAND_USER_VARS;
	if (vim_strpbrk(arg, (char_u *)"\"'+-*/%.=!?~|&$([<>,#") == NULL)
	{
	    /* ":let var1 var2 ...": find last space. */
	    for (p = arg + STRLEN(arg); p >= arg; )
	    {
		xp->xp_pattern = p;
		mb_ptr_back(arg, p);
		if (vim_iswhite(*p))
		    break;
	    }
	    return;
	}
    }
    else
	xp->xp_context = cmdidx == CMD_call ? EXPAND_FUNCTIONS
							  : EXPAND_EXPRESSION;
    while ((xp->xp_pattern = vim_strpbrk(arg,
				  (char_u *)"\"'+-*/%.=!?~|&$([<>,#")) != NULL)
    {
	c = *xp->xp_pattern;
	if (c == '&')
	{
	    c = xp->xp_pattern[1];
	    if (c == '&')
	    {
		++xp->xp_pattern;
		xp->xp_context = cmdidx != CMD_let || got_eq
					 ? EXPAND_EXPRESSION : EXPAND_NOTHING;
	    }
	    else if (c != ' ')
	    {
		xp->xp_context = EXPAND_SETTINGS;
		if ((c == 'l' || c == 'g') && xp->xp_pattern[2] == ':')
		    xp->xp_pattern += 2;

	    }
	}
	else if (c == '$')
	{
	    /* environment variable */
	    xp->xp_context = EXPAND_ENV_VARS;
	}
	else if (c == '=')
	{
	    got_eq = TRUE;
	    xp->xp_context = EXPAND_EXPRESSION;
	}
	else if ((c == '<' || c == '#')
		&& xp->xp_context == EXPAND_FUNCTIONS
		&& vim_strchr(xp->xp_pattern, '(') == NULL)
	{
	    /* Function name can start with "<SNR>" and contain '#'. */
	    break;
	}
	else if (cmdidx != CMD_let || got_eq)
	{
	    if (c == '"')	    /* string */
	    {
		while ((c = *++xp->xp_pattern) != NUL && c != '"')
		    if (c == '\\' && xp->xp_pattern[1] != NUL)
			++xp->xp_pattern;
		xp->xp_context = EXPAND_NOTHING;
	    }
	    else if (c == '\'')	    /* literal string */
	    {
		/* Trick: '' is like stopping and starting a literal string. */
		while ((c = *++xp->xp_pattern) != NUL && c != '\'')
		    /* skip */ ;
		xp->xp_context = EXPAND_NOTHING;
	    }
	    else if (c == '|')
	    {
		if (xp->xp_pattern[1] == '|')
		{
		    ++xp->xp_pattern;
		    xp->xp_context = EXPAND_EXPRESSION;
		}
		else
		    xp->xp_context = EXPAND_COMMANDS;
	    }
	    else
		xp->xp_context = EXPAND_EXPRESSION;
	}
	else
	    /* Doesn't look like something valid, expand as an expression
	     * anyway. */
	    xp->xp_context = EXPAND_EXPRESSION;
	arg = xp->xp_pattern;
	if (*arg != NUL)
	    while ((c = *++arg) != NUL && (c == ' ' || c == '\t'))
		/* skip */ ;
    }
    xp->xp_pattern = arg;
}

#endif /* FEAT_CMDL_COMPL */

/*
 * ":1,25call func(arg1, arg2)"	function call.
 */
    void
ex_call(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    char_u	*startarg;
    char_u	*name;
    char_u	*tofree;
    int		len;
    typval_T	rettv;
    linenr_T	lnum;
    int		doesrange;
    int		failed = FALSE;
    funcdict_T	fudi;

    if (eap->skip)
    {
	/* trans_function_name() doesn't work well when skipping, use eval0()
	 * instead to skip to any following command, e.g. for:
	 *   :if 0 | call dict.foo().bar() | endif  */
	++emsg_skip;
	if (eval0(eap->arg, &rettv, &eap->nextcmd, FALSE) != FAIL)
	    clear_tv(&rettv);
	--emsg_skip;
	return;
    }

    tofree = trans_function_name(&arg, eap->skip, TFN_INT, &fudi);
    if (fudi.fd_newkey != NULL)
    {
	/* Still need to give an error message for missing key. */
	EMSG2(_(e_dictkey), fudi.fd_newkey);
	vim_free(fudi.fd_newkey);
    }
    if (tofree == NULL)
	return;

    /* Increase refcount on dictionary, it could get deleted when evaluating
     * the arguments. */
    if (fudi.fd_dict != NULL)
	++fudi.fd_dict->dv_refcount;

    /* If it is the name of a variable of type VAR_FUNC use its contents. */
    len = (int)STRLEN(tofree);
    name = deref_func_name(tofree, &len, FALSE);

    /* Skip white space to allow ":call func ()".  Not good, but required for
     * backward compatibility. */
    startarg = skipwhite(arg);
    rettv.v_type = VAR_UNKNOWN;	/* clear_tv() uses this */

    if (*startarg != '(')
    {
	EMSG2(_("E107: Missing parentheses: %s"), eap->arg);
	goto end;
    }

    /*
     * When skipping, evaluate the function once, to find the end of the
     * arguments.
     * When the function takes a range, this is discovered after the first
     * call, and the loop is broken.
     */
    if (eap->skip)
    {
	++emsg_skip;
	lnum = eap->line2;	/* do it once, also with an invalid range */
    }
    else
	lnum = eap->line1;
    for ( ; lnum <= eap->line2; ++lnum)
    {
	if (!eap->skip && eap->addr_count > 0)
	{
	    curwin->w_cursor.lnum = lnum;
	    curwin->w_cursor.col = 0;
#ifdef FEAT_VIRTUALEDIT
	    curwin->w_cursor.coladd = 0;
#endif
	}
	arg = startarg;
	if (get_func_tv(name, (int)STRLEN(name), &rettv, &arg,
		    eap->line1, eap->line2, &doesrange,
					    !eap->skip, fudi.fd_dict) == FAIL)
	{
	    failed = TRUE;
	    break;
	}

	/* Handle a function returning a Funcref, Dictionary or List. */
	if (handle_subscript(&arg, &rettv, !eap->skip, TRUE) == FAIL)
	{
	    failed = TRUE;
	    break;
	}

	clear_tv(&rettv);
	if (doesrange || eap->skip)
	    break;

	/* Stop when immediately aborting on error, or when an interrupt
	 * occurred or an exception was thrown but not caught.
	 * get_func_tv() returned OK, so that the check for trailing
	 * characters below is executed. */
	if (aborting())
	    break;
    }
    if (eap->skip)
	--emsg_skip;

    if (!failed)
    {
	/* Check for trailing illegal characters and a following command. */
	if (!ends_excmd(*arg))
	{
	    emsg_severe = TRUE;
	    EMSG(_(e_trailing));
	}
	else
	    eap->nextcmd = check_nextcmd(arg);
    }

end:
    dict_unref(fudi.fd_dict);
    vim_free(tofree);
}

/*
 * ":unlet[!] var1 ... " command.
 */
    void
ex_unlet(exarg_T *eap)
{
    ex_unletlock(eap, eap->arg, 0);
}

/*
 * ":lockvar" and ":unlockvar" commands
 */
    void
ex_lockvar(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    int		deep = 2;

    if (eap->forceit)
	deep = -1;
    else if (vim_isdigit(*arg))
    {
	deep = getdigits(&arg);
	arg = skipwhite(arg);
    }

    ex_unletlock(eap, arg, deep);
}

/*
 * ":unlet", ":lockvar" and ":unlockvar" are quite similar.
 */
    static void
ex_unletlock(
    exarg_T	*eap,
    char_u	*argstart,
    int		deep)
{
    char_u	*arg = argstart;
    char_u	*name_end;
    int		error = FALSE;
    lval_T	lv;

    do
    {
	/* Parse the name and find the end. */
	name_end = get_lval(arg, NULL, &lv, TRUE, eap->skip || error, 0,
							     FNE_CHECK_START);
	if (lv.ll_name == NULL)
	    error = TRUE;	    /* error but continue parsing */
	if (name_end == NULL || (!vim_iswhite(*name_end)
						   && !ends_excmd(*name_end)))
	{
	    if (name_end != NULL)
	    {
		emsg_severe = TRUE;
		EMSG(_(e_trailing));
	    }
	    if (!(eap->skip || error))
		clear_lval(&lv);
	    break;
	}

	if (!error && !eap->skip)
	{
	    if (eap->cmdidx == CMD_unlet)
	    {
		if (do_unlet_var(&lv, name_end, eap->forceit) == FAIL)
		    error = TRUE;
	    }
	    else
	    {
		if (do_lock_var(&lv, name_end, deep,
					  eap->cmdidx == CMD_lockvar) == FAIL)
		    error = TRUE;
	    }
	}

	if (!eap->skip)
	    clear_lval(&lv);

	arg = skipwhite(name_end);
    } while (!ends_excmd(*arg));

    eap->nextcmd = check_nextcmd(arg);
}

    static int
do_unlet_var(
    lval_T	*lp,
    char_u	*name_end,
    int		forceit)
{
    int		ret = OK;
    int		cc;

    if (lp->ll_tv == NULL)
    {
	cc = *name_end;
	*name_end = NUL;

	/* Normal name or expanded name. */
	if (check_changedtick(lp->ll_name))
	    ret = FAIL;
	else if (do_unlet(lp->ll_name, forceit) == FAIL)
	    ret = FAIL;
	*name_end = cc;
    }
    else if ((lp->ll_list != NULL
		   && tv_check_lock(lp->ll_list->lv_lock, lp->ll_name, FALSE))
	    || (lp->ll_dict != NULL
		  && tv_check_lock(lp->ll_dict->dv_lock, lp->ll_name, FALSE)))
	return FAIL;
    else if (lp->ll_range)
    {
	listitem_T    *li;
	listitem_T    *ll_li = lp->ll_li;
	int	      ll_n1 = lp->ll_n1;

	while (ll_li != NULL && (lp->ll_empty2 || lp->ll_n2 >= ll_n1))
	{
	    li = ll_li->li_next;
	    if (tv_check_lock(ll_li->li_tv.v_lock, lp->ll_name, FALSE))
		return FAIL;
	    ll_li = li;
	    ++ll_n1;
	}

	/* Delete a range of List items. */
	while (lp->ll_li != NULL && (lp->ll_empty2 || lp->ll_n2 >= lp->ll_n1))
	{
	    li = lp->ll_li->li_next;
	    listitem_remove(lp->ll_list, lp->ll_li);
	    lp->ll_li = li;
	    ++lp->ll_n1;
	}
    }
    else
    {
	if (lp->ll_list != NULL)
	    /* unlet a List item. */
	    listitem_remove(lp->ll_list, lp->ll_li);
	else
	    /* unlet a Dictionary item. */
	    dictitem_remove(lp->ll_dict, lp->ll_di);
    }

    return ret;
}

/*
 * "unlet" a variable.  Return OK if it existed, FAIL if not.
 * When "forceit" is TRUE don't complain if the variable doesn't exist.
 */
    int
do_unlet(char_u *name, int forceit)
{
    hashtab_T	*ht;
    hashitem_T	*hi;
    char_u	*varname;
    dict_T	*d;
    dictitem_T	*di;

    ht = find_var_ht(name, &varname);
    if (ht != NULL && *varname != NUL)
    {
	if (ht == &globvarht)
	    d = &globvardict;
	else if (current_funccal != NULL
			     && ht == &current_funccal->l_vars.dv_hashtab)
	    d = &current_funccal->l_vars;
	else if (ht == &compat_hashtab)
	    d = &vimvardict;
	else
	{
	    di = find_var_in_ht(ht, *name, (char_u *)"", FALSE);
	    d = di == NULL ? NULL : di->di_tv.vval.v_dict;
	}
	if (d == NULL)
	{
	    EMSG2(_(e_intern2), "do_unlet()");
	    return FAIL;
	}
	hi = hash_find(ht, varname);
	if (!HASHITEM_EMPTY(hi))
	{
	    di = HI2DI(hi);
	    if (var_check_fixed(di->di_flags, name, FALSE)
		    || var_check_ro(di->di_flags, name, FALSE)
		    || tv_check_lock(d->dv_lock, name, FALSE))
		return FAIL;

	    delete_var(ht, hi);
	    return OK;
	}
    }
    if (forceit)
	return OK;
    EMSG2(_("E108: No such variable: \"%s\""), name);
    return FAIL;
}

/*
 * Lock or unlock variable indicated by "lp".
 * "deep" is the levels to go (-1 for unlimited);
 * "lock" is TRUE for ":lockvar", FALSE for ":unlockvar".
 */
    static int
do_lock_var(
    lval_T	*lp,
    char_u	*name_end,
    int		deep,
    int		lock)
{
    int		ret = OK;
    int		cc;
    dictitem_T	*di;

    if (deep == 0)	/* nothing to do */
	return OK;

    if (lp->ll_tv == NULL)
    {
	cc = *name_end;
	*name_end = NUL;

	/* Normal name or expanded name. */
	if (check_changedtick(lp->ll_name))
	    ret = FAIL;
	else
	{
	    di = find_var(lp->ll_name, NULL, TRUE);
	    if (di == NULL)
		ret = FAIL;
	    else
	    {
		if (lock)
		    di->di_flags |= DI_FLAGS_LOCK;
		else
		    di->di_flags &= ~DI_FLAGS_LOCK;
		item_lock(&di->di_tv, deep, lock);
	    }
	}
	*name_end = cc;
    }
    else if (lp->ll_range)
    {
	listitem_T    *li = lp->ll_li;

	/* (un)lock a range of List items. */
	while (li != NULL && (lp->ll_empty2 || lp->ll_n2 >= lp->ll_n1))
	{
	    item_lock(&li->li_tv, deep, lock);
	    li = li->li_next;
	    ++lp->ll_n1;
	}
    }
    else if (lp->ll_list != NULL)
	/* (un)lock a List item. */
	item_lock(&lp->ll_li->li_tv, deep, lock);
    else
	/* (un)lock a Dictionary item. */
	item_lock(&lp->ll_di->di_tv, deep, lock);

    return ret;
}

/*
 * Lock or unlock an item.  "deep" is nr of levels to go.
 */
    static void
item_lock(typval_T *tv, int deep, int lock)
{
    static int	recurse = 0;
    list_T	*l;
    listitem_T	*li;
    dict_T	*d;
    hashitem_T	*hi;
    int		todo;

    if (recurse >= DICT_MAXNEST)
    {
	EMSG(_("E743: variable nested too deep for (un)lock"));
	return;
    }
    if (deep == 0)
	return;
    ++recurse;

    /* lock/unlock the item itself */
    if (lock)
	tv->v_lock |= VAR_LOCKED;
    else
	tv->v_lock &= ~VAR_LOCKED;

    switch (tv->v_type)
    {
	case VAR_UNKNOWN:
	case VAR_NUMBER:
	case VAR_STRING:
	case VAR_FUNC:
	case VAR_FLOAT:
	case VAR_SPECIAL:
	    break;

	case VAR_LIST:
	    if ((l = tv->vval.v_list) != NULL)
	    {
		if (lock)
		    l->lv_lock |= VAR_LOCKED;
		else
		    l->lv_lock &= ~VAR_LOCKED;
		if (deep < 0 || deep > 1)
		    /* recursive: lock/unlock the items the List contains */
		    for (li = l->lv_first; li != NULL; li = li->li_next)
			item_lock(&li->li_tv, deep - 1, lock);
	    }
	    break;
	case VAR_DICT:
	    if ((d = tv->vval.v_dict) != NULL)
	    {
		if (lock)
		    d->dv_lock |= VAR_LOCKED;
		else
		    d->dv_lock &= ~VAR_LOCKED;
		if (deep < 0 || deep > 1)
		{
		    /* recursive: lock/unlock the items the List contains */
		    todo = (int)d->dv_hashtab.ht_used;
		    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
		    {
			if (!HASHITEM_EMPTY(hi))
			{
			    --todo;
			    item_lock(&HI2DI(hi)->di_tv, deep - 1, lock);
			}
		    }
		}
	    }
    }
    --recurse;
}

/*
 * Return TRUE if typeval "tv" is locked: Either that value is locked itself
 * or it refers to a List or Dictionary that is locked.
 */
    static int
tv_islocked(typval_T *tv)
{
    return (tv->v_lock & VAR_LOCKED)
	|| (tv->v_type == VAR_LIST
		&& tv->vval.v_list != NULL
		&& (tv->vval.v_list->lv_lock & VAR_LOCKED))
	|| (tv->v_type == VAR_DICT
		&& tv->vval.v_dict != NULL
		&& (tv->vval.v_dict->dv_lock & VAR_LOCKED));
}

#if (defined(FEAT_MENU) && defined(FEAT_MULTI_LANG)) || defined(PROTO)
/*
 * Delete all "menutrans_" variables.
 */
    void
del_menutrans_vars(void)
{
    hashitem_T	*hi;
    int		todo;

    hash_lock(&globvarht);
    todo = (int)globvarht.ht_used;
    for (hi = globvarht.ht_array; todo > 0 && !got_int; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    if (STRNCMP(HI2DI(hi)->di_key, "menutrans_", 10) == 0)
		delete_var(&globvarht, hi);
	}
    }
    hash_unlock(&globvarht);
}
#endif

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)

/*
 * Local string buffer for the next two functions to store a variable name
 * with its prefix. Allocated in cat_prefix_varname(), freed later in
 * get_user_var_name().
 */

static char_u *cat_prefix_varname(int prefix, char_u *name);

static char_u	*varnamebuf = NULL;
static int	varnamebuflen = 0;

/*
 * Function to concatenate a prefix and a variable name.
 */
    static char_u *
cat_prefix_varname(int prefix, char_u *name)
{
    int		len;

    len = (int)STRLEN(name) + 3;
    if (len > varnamebuflen)
    {
	vim_free(varnamebuf);
	len += 10;			/* some additional space */
	varnamebuf = alloc(len);
	if (varnamebuf == NULL)
	{
	    varnamebuflen = 0;
	    return NULL;
	}
	varnamebuflen = len;
    }
    *varnamebuf = prefix;
    varnamebuf[1] = ':';
    STRCPY(varnamebuf + 2, name);
    return varnamebuf;
}

/*
 * Function given to ExpandGeneric() to obtain the list of user defined
 * (global/buffer/window/built-in) variable names.
 */
    char_u *
get_user_var_name(expand_T *xp, int idx)
{
    static long_u	gdone;
    static long_u	bdone;
    static long_u	wdone;
#ifdef FEAT_WINDOWS
    static long_u	tdone;
#endif
    static int		vidx;
    static hashitem_T	*hi;
    hashtab_T		*ht;

    if (idx == 0)
    {
	gdone = bdone = wdone = vidx = 0;
#ifdef FEAT_WINDOWS
	tdone = 0;
#endif
    }

    /* Global variables */
    if (gdone < globvarht.ht_used)
    {
	if (gdone++ == 0)
	    hi = globvarht.ht_array;
	else
	    ++hi;
	while (HASHITEM_EMPTY(hi))
	    ++hi;
	if (STRNCMP("g:", xp->xp_pattern, 2) == 0)
	    return cat_prefix_varname('g', hi->hi_key);
	return hi->hi_key;
    }

    /* b: variables */
    ht = &curbuf->b_vars->dv_hashtab;
    if (bdone < ht->ht_used)
    {
	if (bdone++ == 0)
	    hi = ht->ht_array;
	else
	    ++hi;
	while (HASHITEM_EMPTY(hi))
	    ++hi;
	return cat_prefix_varname('b', hi->hi_key);
    }
    if (bdone == ht->ht_used)
    {
	++bdone;
	return (char_u *)"b:changedtick";
    }

    /* w: variables */
    ht = &curwin->w_vars->dv_hashtab;
    if (wdone < ht->ht_used)
    {
	if (wdone++ == 0)
	    hi = ht->ht_array;
	else
	    ++hi;
	while (HASHITEM_EMPTY(hi))
	    ++hi;
	return cat_prefix_varname('w', hi->hi_key);
    }

#ifdef FEAT_WINDOWS
    /* t: variables */
    ht = &curtab->tp_vars->dv_hashtab;
    if (tdone < ht->ht_used)
    {
	if (tdone++ == 0)
	    hi = ht->ht_array;
	else
	    ++hi;
	while (HASHITEM_EMPTY(hi))
	    ++hi;
	return cat_prefix_varname('t', hi->hi_key);
    }
#endif

    /* v: variables */
    if (vidx < VV_LEN)
	return cat_prefix_varname('v', (char_u *)vimvars[vidx++].vv_name);

    vim_free(varnamebuf);
    varnamebuf = NULL;
    varnamebuflen = 0;
    return NULL;
}

#endif /* FEAT_CMDL_COMPL */

/*
 * types for expressions.
 */
typedef enum
{
    TYPE_UNKNOWN = 0
    , TYPE_EQUAL	/* == */
    , TYPE_NEQUAL	/* != */
    , TYPE_GREATER	/* >  */
    , TYPE_GEQUAL	/* >= */
    , TYPE_SMALLER	/* <  */
    , TYPE_SEQUAL	/* <= */
    , TYPE_MATCH	/* =~ */
    , TYPE_NOMATCH	/* !~ */
} exptype_T;

/*
 * The "evaluate" argument: When FALSE, the argument is only parsed but not
 * executed.  The function may return OK, but the rettv will be of type
 * VAR_UNKNOWN.  The function still returns FAIL for a syntax error.
 */

/*
 * Handle zero level expression.
 * This calls eval1() and handles error message and nextcmd.
 * Put the result in "rettv" when returning OK and "evaluate" is TRUE.
 * Note: "rettv.v_lock" is not set.
 * Return OK or FAIL.
 */
    static int
eval0(
    char_u	*arg,
    typval_T	*rettv,
    char_u	**nextcmd,
    int		evaluate)
{
    int		ret;
    char_u	*p;

    p = skipwhite(arg);
    ret = eval1(&p, rettv, evaluate);
    if (ret == FAIL || !ends_excmd(*p))
    {
	if (ret != FAIL)
	    clear_tv(rettv);
	/*
	 * Report the invalid expression unless the expression evaluation has
	 * been cancelled due to an aborting error, an interrupt, or an
	 * exception.
	 */
	if (!aborting())
	    EMSG2(_(e_invexpr2), arg);
	ret = FAIL;
    }
    if (nextcmd != NULL)
	*nextcmd = check_nextcmd(p);

    return ret;
}

/*
 * Handle top level expression:
 *	expr2 ? expr1 : expr1
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Note: "rettv.v_lock" is not set.
 *
 * Return OK or FAIL.
 */
    static int
eval1(char_u **arg, typval_T *rettv, int evaluate)
{
    int		result;
    typval_T	var2;

    /*
     * Get the first variable.
     */
    if (eval2(arg, rettv, evaluate) == FAIL)
	return FAIL;

    if ((*arg)[0] == '?')
    {
	result = FALSE;
	if (evaluate)
	{
	    int		error = FALSE;

	    if (get_tv_number_chk(rettv, &error) != 0)
		result = TRUE;
	    clear_tv(rettv);
	    if (error)
		return FAIL;
	}

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(*arg + 1);
	if (eval1(arg, rettv, evaluate && result) == FAIL) /* recursive! */
	    return FAIL;

	/*
	 * Check for the ":".
	 */
	if ((*arg)[0] != ':')
	{
	    EMSG(_("E109: Missing ':' after '?'"));
	    if (evaluate && result)
		clear_tv(rettv);
	    return FAIL;
	}

	/*
	 * Get the third variable.
	 */
	*arg = skipwhite(*arg + 1);
	if (eval1(arg, &var2, evaluate && !result) == FAIL) /* recursive! */
	{
	    if (evaluate && result)
		clear_tv(rettv);
	    return FAIL;
	}
	if (evaluate && !result)
	    *rettv = var2;
    }

    return OK;
}

/*
 * Handle first level expression:
 *	expr2 || expr2 || expr2	    logical OR
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval2(char_u **arg, typval_T *rettv, int evaluate)
{
    typval_T	var2;
    long	result;
    int		first;
    int		error = FALSE;

    /*
     * Get the first variable.
     */
    if (eval3(arg, rettv, evaluate) == FAIL)
	return FAIL;

    /*
     * Repeat until there is no following "||".
     */
    first = TRUE;
    result = FALSE;
    while ((*arg)[0] == '|' && (*arg)[1] == '|')
    {
	if (evaluate && first)
	{
	    if (get_tv_number_chk(rettv, &error) != 0)
		result = TRUE;
	    clear_tv(rettv);
	    if (error)
		return FAIL;
	    first = FALSE;
	}

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(*arg + 2);
	if (eval3(arg, &var2, evaluate && !result) == FAIL)
	    return FAIL;

	/*
	 * Compute the result.
	 */
	if (evaluate && !result)
	{
	    if (get_tv_number_chk(&var2, &error) != 0)
		result = TRUE;
	    clear_tv(&var2);
	    if (error)
		return FAIL;
	}
	if (evaluate)
	{
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = result;
	}
    }

    return OK;
}

/*
 * Handle second level expression:
 *	expr3 && expr3 && expr3	    logical AND
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval3(char_u **arg, typval_T *rettv, int evaluate)
{
    typval_T	var2;
    long	result;
    int		first;
    int		error = FALSE;

    /*
     * Get the first variable.
     */
    if (eval4(arg, rettv, evaluate) == FAIL)
	return FAIL;

    /*
     * Repeat until there is no following "&&".
     */
    first = TRUE;
    result = TRUE;
    while ((*arg)[0] == '&' && (*arg)[1] == '&')
    {
	if (evaluate && first)
	{
	    if (get_tv_number_chk(rettv, &error) == 0)
		result = FALSE;
	    clear_tv(rettv);
	    if (error)
		return FAIL;
	    first = FALSE;
	}

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(*arg + 2);
	if (eval4(arg, &var2, evaluate && result) == FAIL)
	    return FAIL;

	/*
	 * Compute the result.
	 */
	if (evaluate && result)
	{
	    if (get_tv_number_chk(&var2, &error) == 0)
		result = FALSE;
	    clear_tv(&var2);
	    if (error)
		return FAIL;
	}
	if (evaluate)
	{
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = result;
	}
    }

    return OK;
}

/*
 * Handle third level expression:
 *	var1 == var2
 *	var1 =~ var2
 *	var1 != var2
 *	var1 !~ var2
 *	var1 > var2
 *	var1 >= var2
 *	var1 < var2
 *	var1 <= var2
 *	var1 is var2
 *	var1 isnot var2
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval4(char_u **arg, typval_T *rettv, int evaluate)
{
    typval_T	var2;
    char_u	*p;
    int		i;
    exptype_T	type = TYPE_UNKNOWN;
    int		type_is = FALSE;    /* TRUE for "is" and "isnot" */
    int		len = 2;
    long	n1, n2;
    char_u	*s1, *s2;
    char_u	buf1[NUMBUFLEN], buf2[NUMBUFLEN];
    regmatch_T	regmatch;
    int		ic;
    char_u	*save_cpo;

    /*
     * Get the first variable.
     */
    if (eval5(arg, rettv, evaluate) == FAIL)
	return FAIL;

    p = *arg;
    switch (p[0])
    {
	case '=':   if (p[1] == '=')
			type = TYPE_EQUAL;
		    else if (p[1] == '~')
			type = TYPE_MATCH;
		    break;
	case '!':   if (p[1] == '=')
			type = TYPE_NEQUAL;
		    else if (p[1] == '~')
			type = TYPE_NOMATCH;
		    break;
	case '>':   if (p[1] != '=')
		    {
			type = TYPE_GREATER;
			len = 1;
		    }
		    else
			type = TYPE_GEQUAL;
		    break;
	case '<':   if (p[1] != '=')
		    {
			type = TYPE_SMALLER;
			len = 1;
		    }
		    else
			type = TYPE_SEQUAL;
		    break;
	case 'i':   if (p[1] == 's')
		    {
			if (p[2] == 'n' && p[3] == 'o' && p[4] == 't')
			    len = 5;
			i = p[len];
			if (!isalnum(i) && i != '_')
			{
			    type = len == 2 ? TYPE_EQUAL : TYPE_NEQUAL;
			    type_is = TRUE;
			}
		    }
		    break;
    }

    /*
     * If there is a comparative operator, use it.
     */
    if (type != TYPE_UNKNOWN)
    {
	/* extra question mark appended: ignore case */
	if (p[len] == '?')
	{
	    ic = TRUE;
	    ++len;
	}
	/* extra '#' appended: match case */
	else if (p[len] == '#')
	{
	    ic = FALSE;
	    ++len;
	}
	/* nothing appended: use 'ignorecase' */
	else
	    ic = p_ic;

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(p + len);
	if (eval5(arg, &var2, evaluate) == FAIL)
	{
	    clear_tv(rettv);
	    return FAIL;
	}

	if (evaluate)
	{
	    if (type_is && rettv->v_type != var2.v_type)
	    {
		/* For "is" a different type always means FALSE, for "notis"
		 * it means TRUE. */
		n1 = (type == TYPE_NEQUAL);
	    }
	    else if (rettv->v_type == VAR_LIST || var2.v_type == VAR_LIST)
	    {
		if (type_is)
		{
		    n1 = (rettv->v_type == var2.v_type
				   && rettv->vval.v_list == var2.vval.v_list);
		    if (type == TYPE_NEQUAL)
			n1 = !n1;
		}
		else if (rettv->v_type != var2.v_type
			|| (type != TYPE_EQUAL && type != TYPE_NEQUAL))
		{
		    if (rettv->v_type != var2.v_type)
			EMSG(_("E691: Can only compare List with List"));
		    else
			EMSG(_("E692: Invalid operation for List"));
		    clear_tv(rettv);
		    clear_tv(&var2);
		    return FAIL;
		}
		else
		{
		    /* Compare two Lists for being equal or unequal. */
		    n1 = list_equal(rettv->vval.v_list, var2.vval.v_list,
								   ic, FALSE);
		    if (type == TYPE_NEQUAL)
			n1 = !n1;
		}
	    }

	    else if (rettv->v_type == VAR_DICT || var2.v_type == VAR_DICT)
	    {
		if (type_is)
		{
		    n1 = (rettv->v_type == var2.v_type
				   && rettv->vval.v_dict == var2.vval.v_dict);
		    if (type == TYPE_NEQUAL)
			n1 = !n1;
		}
		else if (rettv->v_type != var2.v_type
			|| (type != TYPE_EQUAL && type != TYPE_NEQUAL))
		{
		    if (rettv->v_type != var2.v_type)
			EMSG(_("E735: Can only compare Dictionary with Dictionary"));
		    else
			EMSG(_("E736: Invalid operation for Dictionary"));
		    clear_tv(rettv);
		    clear_tv(&var2);
		    return FAIL;
		}
		else
		{
		    /* Compare two Dictionaries for being equal or unequal. */
		    n1 = dict_equal(rettv->vval.v_dict, var2.vval.v_dict,
								   ic, FALSE);
		    if (type == TYPE_NEQUAL)
			n1 = !n1;
		}
	    }

	    else if (rettv->v_type == VAR_FUNC || var2.v_type == VAR_FUNC)
	    {
		if (rettv->v_type != var2.v_type
			|| (type != TYPE_EQUAL && type != TYPE_NEQUAL))
		{
		    if (rettv->v_type != var2.v_type)
			EMSG(_("E693: Can only compare Funcref with Funcref"));
		    else
			EMSG(_("E694: Invalid operation for Funcrefs"));
		    clear_tv(rettv);
		    clear_tv(&var2);
		    return FAIL;
		}
		else
		{
		    /* Compare two Funcrefs for being equal or unequal. */
		    if (rettv->vval.v_string == NULL
						|| var2.vval.v_string == NULL)
			n1 = FALSE;
		    else
			n1 = STRCMP(rettv->vval.v_string,
						     var2.vval.v_string) == 0;
		    if (type == TYPE_NEQUAL)
			n1 = !n1;
		}
	    }

#ifdef FEAT_FLOAT
	    /*
	     * If one of the two variables is a float, compare as a float.
	     * When using "=~" or "!~", always compare as string.
	     */
	    else if ((rettv->v_type == VAR_FLOAT || var2.v_type == VAR_FLOAT)
		    && type != TYPE_MATCH && type != TYPE_NOMATCH)
	    {
		float_T f1, f2;

		if (rettv->v_type == VAR_FLOAT)
		    f1 = rettv->vval.v_float;
		else
		    f1 = get_tv_number(rettv);
		if (var2.v_type == VAR_FLOAT)
		    f2 = var2.vval.v_float;
		else
		    f2 = get_tv_number(&var2);
		n1 = FALSE;
		switch (type)
		{
		    case TYPE_EQUAL:    n1 = (f1 == f2); break;
		    case TYPE_NEQUAL:   n1 = (f1 != f2); break;
		    case TYPE_GREATER:  n1 = (f1 > f2); break;
		    case TYPE_GEQUAL:   n1 = (f1 >= f2); break;
		    case TYPE_SMALLER:  n1 = (f1 < f2); break;
		    case TYPE_SEQUAL:   n1 = (f1 <= f2); break;
		    case TYPE_UNKNOWN:
		    case TYPE_MATCH:
		    case TYPE_NOMATCH:  break;  /* avoid gcc warning */
		}
	    }
#endif

	    /*
	     * If one of the two variables is a number, compare as a number.
	     * When using "=~" or "!~", always compare as string.
	     */
	    else if ((rettv->v_type == VAR_NUMBER || var2.v_type == VAR_NUMBER)
		    && type != TYPE_MATCH && type != TYPE_NOMATCH)
	    {
		n1 = get_tv_number(rettv);
		n2 = get_tv_number(&var2);
		switch (type)
		{
		    case TYPE_EQUAL:    n1 = (n1 == n2); break;
		    case TYPE_NEQUAL:   n1 = (n1 != n2); break;
		    case TYPE_GREATER:  n1 = (n1 > n2); break;
		    case TYPE_GEQUAL:   n1 = (n1 >= n2); break;
		    case TYPE_SMALLER:  n1 = (n1 < n2); break;
		    case TYPE_SEQUAL:   n1 = (n1 <= n2); break;
		    case TYPE_UNKNOWN:
		    case TYPE_MATCH:
		    case TYPE_NOMATCH:  break;  /* avoid gcc warning */
		}
	    }
	    else
	    {
		s1 = get_tv_string_buf(rettv, buf1);
		s2 = get_tv_string_buf(&var2, buf2);
		if (type != TYPE_MATCH && type != TYPE_NOMATCH)
		    i = ic ? MB_STRICMP(s1, s2) : STRCMP(s1, s2);
		else
		    i = 0;
		n1 = FALSE;
		switch (type)
		{
		    case TYPE_EQUAL:    n1 = (i == 0); break;
		    case TYPE_NEQUAL:   n1 = (i != 0); break;
		    case TYPE_GREATER:  n1 = (i > 0); break;
		    case TYPE_GEQUAL:   n1 = (i >= 0); break;
		    case TYPE_SMALLER:  n1 = (i < 0); break;
		    case TYPE_SEQUAL:   n1 = (i <= 0); break;

		    case TYPE_MATCH:
		    case TYPE_NOMATCH:
			    /* avoid 'l' flag in 'cpoptions' */
			    save_cpo = p_cpo;
			    p_cpo = (char_u *)"";
			    regmatch.regprog = vim_regcomp(s2,
							RE_MAGIC + RE_STRING);
			    regmatch.rm_ic = ic;
			    if (regmatch.regprog != NULL)
			    {
				n1 = vim_regexec_nl(&regmatch, s1, (colnr_T)0);
				vim_regfree(regmatch.regprog);
				if (type == TYPE_NOMATCH)
				    n1 = !n1;
			    }
			    p_cpo = save_cpo;
			    break;

		    case TYPE_UNKNOWN:  break;  /* avoid gcc warning */
		}
	    }
	    clear_tv(rettv);
	    clear_tv(&var2);
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = n1;
	}
    }

    return OK;
}

/*
 * Handle fourth level expression:
 *	+	number addition
 *	-	number subtraction
 *	.	string concatenation
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval5(char_u **arg, typval_T *rettv, int evaluate)
{
    typval_T	var2;
    typval_T	var3;
    int		op;
    long	n1, n2;
#ifdef FEAT_FLOAT
    float_T	f1 = 0, f2 = 0;
#endif
    char_u	*s1, *s2;
    char_u	buf1[NUMBUFLEN], buf2[NUMBUFLEN];
    char_u	*p;

    /*
     * Get the first variable.
     */
    if (eval6(arg, rettv, evaluate, FALSE) == FAIL)
	return FAIL;

    /*
     * Repeat computing, until no '+', '-' or '.' is following.
     */
    for (;;)
    {
	op = **arg;
	if (op != '+' && op != '-' && op != '.')
	    break;

	if ((op != '+' || rettv->v_type != VAR_LIST)
#ifdef FEAT_FLOAT
		&& (op == '.' || rettv->v_type != VAR_FLOAT)
#endif
		)
	{
	    /* For "list + ...", an illegal use of the first operand as
	     * a number cannot be determined before evaluating the 2nd
	     * operand: if this is also a list, all is ok.
	     * For "something . ...", "something - ..." or "non-list + ...",
	     * we know that the first operand needs to be a string or number
	     * without evaluating the 2nd operand.  So check before to avoid
	     * side effects after an error. */
	    if (evaluate && get_tv_string_chk(rettv) == NULL)
	    {
		clear_tv(rettv);
		return FAIL;
	    }
	}

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(*arg + 1);
	if (eval6(arg, &var2, evaluate, op == '.') == FAIL)
	{
	    clear_tv(rettv);
	    return FAIL;
	}

	if (evaluate)
	{
	    /*
	     * Compute the result.
	     */
	    if (op == '.')
	    {
		s1 = get_tv_string_buf(rettv, buf1);	/* already checked */
		s2 = get_tv_string_buf_chk(&var2, buf2);
		if (s2 == NULL)		/* type error ? */
		{
		    clear_tv(rettv);
		    clear_tv(&var2);
		    return FAIL;
		}
		p = concat_str(s1, s2);
		clear_tv(rettv);
		rettv->v_type = VAR_STRING;
		rettv->vval.v_string = p;
	    }
	    else if (op == '+' && rettv->v_type == VAR_LIST
						   && var2.v_type == VAR_LIST)
	    {
		/* concatenate Lists */
		if (list_concat(rettv->vval.v_list, var2.vval.v_list,
							       &var3) == FAIL)
		{
		    clear_tv(rettv);
		    clear_tv(&var2);
		    return FAIL;
		}
		clear_tv(rettv);
		*rettv = var3;
	    }
	    else
	    {
		int	    error = FALSE;

#ifdef FEAT_FLOAT
		if (rettv->v_type == VAR_FLOAT)
		{
		    f1 = rettv->vval.v_float;
		    n1 = 0;
		}
		else
#endif
		{
		    n1 = get_tv_number_chk(rettv, &error);
		    if (error)
		    {
			/* This can only happen for "list + non-list".  For
			 * "non-list + ..." or "something - ...", we returned
			 * before evaluating the 2nd operand. */
			clear_tv(rettv);
			return FAIL;
		    }
#ifdef FEAT_FLOAT
		    if (var2.v_type == VAR_FLOAT)
			f1 = n1;
#endif
		}
#ifdef FEAT_FLOAT
		if (var2.v_type == VAR_FLOAT)
		{
		    f2 = var2.vval.v_float;
		    n2 = 0;
		}
		else
#endif
		{
		    n2 = get_tv_number_chk(&var2, &error);
		    if (error)
		    {
			clear_tv(rettv);
			clear_tv(&var2);
			return FAIL;
		    }
#ifdef FEAT_FLOAT
		    if (rettv->v_type == VAR_FLOAT)
			f2 = n2;
#endif
		}
		clear_tv(rettv);

#ifdef FEAT_FLOAT
		/* If there is a float on either side the result is a float. */
		if (rettv->v_type == VAR_FLOAT || var2.v_type == VAR_FLOAT)
		{
		    if (op == '+')
			f1 = f1 + f2;
		    else
			f1 = f1 - f2;
		    rettv->v_type = VAR_FLOAT;
		    rettv->vval.v_float = f1;
		}
		else
#endif
		{
		    if (op == '+')
			n1 = n1 + n2;
		    else
			n1 = n1 - n2;
		    rettv->v_type = VAR_NUMBER;
		    rettv->vval.v_number = n1;
		}
	    }
	    clear_tv(&var2);
	}
    }
    return OK;
}

/*
 * Handle fifth level expression:
 *	*	number multiplication
 *	/	number division
 *	%	number modulo
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval6(
    char_u	**arg,
    typval_T	*rettv,
    int		evaluate,
    int		want_string)  /* after "." operator */
{
    typval_T	var2;
    int		op;
    long	n1, n2;
#ifdef FEAT_FLOAT
    int		use_float = FALSE;
    float_T	f1 = 0, f2;
#endif
    int		error = FALSE;

    /*
     * Get the first variable.
     */
    if (eval7(arg, rettv, evaluate, want_string) == FAIL)
	return FAIL;

    /*
     * Repeat computing, until no '*', '/' or '%' is following.
     */
    for (;;)
    {
	op = **arg;
	if (op != '*' && op != '/' && op != '%')
	    break;

	if (evaluate)
	{
#ifdef FEAT_FLOAT
	    if (rettv->v_type == VAR_FLOAT)
	    {
		f1 = rettv->vval.v_float;
		use_float = TRUE;
		n1 = 0;
	    }
	    else
#endif
		n1 = get_tv_number_chk(rettv, &error);
	    clear_tv(rettv);
	    if (error)
		return FAIL;
	}
	else
	    n1 = 0;

	/*
	 * Get the second variable.
	 */
	*arg = skipwhite(*arg + 1);
	if (eval7(arg, &var2, evaluate, FALSE) == FAIL)
	    return FAIL;

	if (evaluate)
	{
#ifdef FEAT_FLOAT
	    if (var2.v_type == VAR_FLOAT)
	    {
		if (!use_float)
		{
		    f1 = n1;
		    use_float = TRUE;
		}
		f2 = var2.vval.v_float;
		n2 = 0;
	    }
	    else
#endif
	    {
		n2 = get_tv_number_chk(&var2, &error);
		clear_tv(&var2);
		if (error)
		    return FAIL;
#ifdef FEAT_FLOAT
		if (use_float)
		    f2 = n2;
#endif
	    }

	    /*
	     * Compute the result.
	     * When either side is a float the result is a float.
	     */
#ifdef FEAT_FLOAT
	    if (use_float)
	    {
		if (op == '*')
		    f1 = f1 * f2;
		else if (op == '/')
		{
# ifdef VMS
		    /* VMS crashes on divide by zero, work around it */
		    if (f2 == 0.0)
		    {
			if (f1 == 0)
			    f1 = -1 * __F_FLT_MAX - 1L;   /* similar to NaN */
			else if (f1 < 0)
			    f1 = -1 * __F_FLT_MAX;
			else
			    f1 = __F_FLT_MAX;
		    }
		    else
			f1 = f1 / f2;
# else
		    /* We rely on the floating point library to handle divide
		     * by zero to result in "inf" and not a crash. */
		    f1 = f1 / f2;
# endif
		}
		else
		{
		    EMSG(_("E804: Cannot use '%' with Float"));
		    return FAIL;
		}
		rettv->v_type = VAR_FLOAT;
		rettv->vval.v_float = f1;
	    }
	    else
#endif
	    {
		if (op == '*')
		    n1 = n1 * n2;
		else if (op == '/')
		{
		    if (n2 == 0)	/* give an error message? */
		    {
			if (n1 == 0)
			    n1 = -0x7fffffffL - 1L;	/* similar to NaN */
			else if (n1 < 0)
			    n1 = -0x7fffffffL;
			else
			    n1 = 0x7fffffffL;
		    }
		    else
			n1 = n1 / n2;
		}
		else
		{
		    if (n2 == 0)	/* give an error message? */
			n1 = 0;
		    else
			n1 = n1 % n2;
		}
		rettv->v_type = VAR_NUMBER;
		rettv->vval.v_number = n1;
	    }
	}
    }

    return OK;
}

/*
 * Handle sixth level expression:
 *  number		number constant
 *  "string"		string constant
 *  'string'		literal string constant
 *  &option-name	option value
 *  @r			register contents
 *  identifier		variable value
 *  function()		function call
 *  $VAR		environment variable
 *  (expression)	nested expression
 *  [expr, expr]	List
 *  {key: val, key: val}  Dictionary
 *
 *  Also handle:
 *  ! in front		logical NOT
 *  - in front		unary minus
 *  + in front		unary plus (ignored)
 *  trailing []		subscript in String or List
 *  trailing .name	entry in Dictionary
 *
 * "arg" must point to the first non-white of the expression.
 * "arg" is advanced to the next non-white after the recognized expression.
 *
 * Return OK or FAIL.
 */
    static int
eval7(
    char_u	**arg,
    typval_T	*rettv,
    int		evaluate,
    int		want_string UNUSED)	/* after "." operator */
{
    long	n;
    int		len;
    char_u	*s;
    char_u	*start_leader, *end_leader;
    int		ret = OK;
    char_u	*alias;

    /*
     * Initialise variable so that clear_tv() can't mistake this for a
     * string and free a string that isn't there.
     */
    rettv->v_type = VAR_UNKNOWN;

    /*
     * Skip '!' and '-' characters.  They are handled later.
     */
    start_leader = *arg;
    while (**arg == '!' || **arg == '-' || **arg == '+')
	*arg = skipwhite(*arg + 1);
    end_leader = *arg;

    switch (**arg)
    {
    /*
     * Number constant.
     */
    case '0':
    case '1':
    case '2':
    case '3':
    case '4':
    case '5':
    case '6':
    case '7':
    case '8':
    case '9':
	{
#ifdef FEAT_FLOAT
		char_u *p = skipdigits(*arg + 1);
		int    get_float = FALSE;

		/* We accept a float when the format matches
		 * "[0-9]\+\.[0-9]\+\([eE][+-]\?[0-9]\+\)\?".  This is very
		 * strict to avoid backwards compatibility problems.
		 * Don't look for a float after the "." operator, so that
		 * ":let vers = 1.2.3" doesn't fail. */
		if (!want_string && p[0] == '.' && vim_isdigit(p[1]))
		{
		    get_float = TRUE;
		    p = skipdigits(p + 2);
		    if (*p == 'e' || *p == 'E')
		    {
			++p;
			if (*p == '-' || *p == '+')
			    ++p;
			if (!vim_isdigit(*p))
			    get_float = FALSE;
			else
			    p = skipdigits(p + 1);
		    }
		    if (ASCII_ISALPHA(*p) || *p == '.')
			get_float = FALSE;
		}
		if (get_float)
		{
		    float_T	f;

		    *arg += string2float(*arg, &f);
		    if (evaluate)
		    {
			rettv->v_type = VAR_FLOAT;
			rettv->vval.v_float = f;
		    }
		}
		else
#endif
		{
		    vim_str2nr(*arg, NULL, &len, STR2NR_ALL, &n, NULL, 0);
		    *arg += len;
		    if (evaluate)
		    {
			rettv->v_type = VAR_NUMBER;
			rettv->vval.v_number = n;
		    }
		}
		break;
	}

    /*
     * String constant: "string".
     */
    case '"':	ret = get_string_tv(arg, rettv, evaluate);
		break;

    /*
     * Literal string constant: 'str''ing'.
     */
    case '\'':	ret = get_lit_string_tv(arg, rettv, evaluate);
		break;

    /*
     * List: [expr, expr]
     */
    case '[':	ret = get_list_tv(arg, rettv, evaluate);
		break;

    /*
     * Dictionary: {key: val, key: val}
     */
    case '{':	ret = get_dict_tv(arg, rettv, evaluate);
		break;

    /*
     * Option value: &name
     */
    case '&':	ret = get_option_tv(arg, rettv, evaluate);
		break;

    /*
     * Environment variable: $VAR.
     */
    case '$':	ret = get_env_tv(arg, rettv, evaluate);
		break;

    /*
     * Register contents: @r.
     */
    case '@':	++*arg;
		if (evaluate)
		{
		    rettv->v_type = VAR_STRING;
		    rettv->vval.v_string = get_reg_contents(**arg,
							    GREG_EXPR_SRC);
		}
		if (**arg != NUL)
		    ++*arg;
		break;

    /*
     * nested expression: (expression).
     */
    case '(':	*arg = skipwhite(*arg + 1);
		ret = eval1(arg, rettv, evaluate);	/* recursive! */
		if (**arg == ')')
		    ++*arg;
		else if (ret == OK)
		{
		    EMSG(_("E110: Missing ')'"));
		    clear_tv(rettv);
		    ret = FAIL;
		}
		break;

    default:	ret = NOTDONE;
		break;
    }

    if (ret == NOTDONE)
    {
	/*
	 * Must be a variable or function name.
	 * Can also be a curly-braces kind of name: {expr}.
	 */
	s = *arg;
	len = get_name_len(arg, &alias, evaluate, TRUE);
	if (alias != NULL)
	    s = alias;

	if (len <= 0)
	    ret = FAIL;
	else
	{
	    if (**arg == '(')		/* recursive! */
	    {
		/* If "s" is the name of a variable of type VAR_FUNC
		 * use its contents. */
		s = deref_func_name(s, &len, !evaluate);

		/* Invoke the function. */
		ret = get_func_tv(s, len, rettv, arg,
			  curwin->w_cursor.lnum, curwin->w_cursor.lnum,
			  &len, evaluate, NULL);

		/* If evaluate is FALSE rettv->v_type was not set in
		 * get_func_tv, but it's needed in handle_subscript() to parse
		 * what follows. So set it here. */
		if (rettv->v_type == VAR_UNKNOWN && !evaluate && **arg == '(')
		{
		    rettv->vval.v_string = vim_strsave((char_u *)"");
		    rettv->v_type = VAR_FUNC;
		}

		/* Stop the expression evaluation when immediately
		 * aborting on error, or when an interrupt occurred or
		 * an exception was thrown but not caught. */
		if (aborting())
		{
		    if (ret == OK)
			clear_tv(rettv);
		    ret = FAIL;
		}
	    }
	    else if (evaluate)
		ret = get_var_tv(s, len, rettv, NULL, TRUE, FALSE);
	    else
		ret = OK;
	}
	vim_free(alias);
    }

    *arg = skipwhite(*arg);

    /* Handle following '[', '(' and '.' for expr[expr], expr.name,
     * expr(expr). */
    if (ret == OK)
	ret = handle_subscript(arg, rettv, evaluate, TRUE);

    /*
     * Apply logical NOT and unary '-', from right to left, ignore '+'.
     */
    if (ret == OK && evaluate && end_leader > start_leader)
    {
	int	    error = FALSE;
	int	    val = 0;
#ifdef FEAT_FLOAT
	float_T	    f = 0.0;

	if (rettv->v_type == VAR_FLOAT)
	    f = rettv->vval.v_float;
	else
#endif
	    val = get_tv_number_chk(rettv, &error);
	if (error)
	{
	    clear_tv(rettv);
	    ret = FAIL;
	}
	else
	{
	    while (end_leader > start_leader)
	    {
		--end_leader;
		if (*end_leader == '!')
		{
#ifdef FEAT_FLOAT
		    if (rettv->v_type == VAR_FLOAT)
			f = !f;
		    else
#endif
			val = !val;
		}
		else if (*end_leader == '-')
		{
#ifdef FEAT_FLOAT
		    if (rettv->v_type == VAR_FLOAT)
			f = -f;
		    else
#endif
			val = -val;
		}
	    }
#ifdef FEAT_FLOAT
	    if (rettv->v_type == VAR_FLOAT)
	    {
		clear_tv(rettv);
		rettv->vval.v_float = f;
	    }
	    else
#endif
	    {
		clear_tv(rettv);
		rettv->v_type = VAR_NUMBER;
		rettv->vval.v_number = val;
	    }
	}
    }

    return ret;
}

/*
 * Evaluate an "[expr]" or "[expr:expr]" index.  Also "dict.key".
 * "*arg" points to the '[' or '.'.
 * Returns FAIL or OK. "*arg" is advanced to after the ']'.
 */
    static int
eval_index(
    char_u	**arg,
    typval_T	*rettv,
    int		evaluate,
    int		verbose)	/* give error messages */
{
    int		empty1 = FALSE, empty2 = FALSE;
    typval_T	var1, var2;
    long	n1, n2 = 0;
    long	len = -1;
    int		range = FALSE;
    char_u	*s;
    char_u	*key = NULL;

    switch (rettv->v_type)
    {
	case VAR_FUNC:
	    if (verbose)
		EMSG(_("E695: Cannot index a Funcref"));
	    return FAIL;
	case VAR_FLOAT:
#ifdef FEAT_FLOAT
	    if (verbose)
		EMSG(_(e_float_as_string));
	    return FAIL;
#endif
	case VAR_SPECIAL:
	    if (verbose)
		EMSG(_("E909: Cannot index a special variable"));
	    return FAIL;
	case VAR_UNKNOWN:
	    if (evaluate)
		return FAIL;
	    /* FALLTHROUGH */

	case VAR_STRING:
	case VAR_NUMBER:
	case VAR_LIST:
	case VAR_DICT:
	    break;
    }

    init_tv(&var1);
    init_tv(&var2);
    if (**arg == '.')
    {
	/*
	 * dict.name
	 */
	key = *arg + 1;
	for (len = 0; ASCII_ISALNUM(key[len]) || key[len] == '_'; ++len)
	    ;
	if (len == 0)
	    return FAIL;
	*arg = skipwhite(key + len);
    }
    else
    {
	/*
	 * something[idx]
	 *
	 * Get the (first) variable from inside the [].
	 */
	*arg = skipwhite(*arg + 1);
	if (**arg == ':')
	    empty1 = TRUE;
	else if (eval1(arg, &var1, evaluate) == FAIL)	/* recursive! */
	    return FAIL;
	else if (evaluate && get_tv_string_chk(&var1) == NULL)
	{
	    /* not a number or string */
	    clear_tv(&var1);
	    return FAIL;
	}

	/*
	 * Get the second variable from inside the [:].
	 */
	if (**arg == ':')
	{
	    range = TRUE;
	    *arg = skipwhite(*arg + 1);
	    if (**arg == ']')
		empty2 = TRUE;
	    else if (eval1(arg, &var2, evaluate) == FAIL)	/* recursive! */
	    {
		if (!empty1)
		    clear_tv(&var1);
		return FAIL;
	    }
	    else if (evaluate && get_tv_string_chk(&var2) == NULL)
	    {
		/* not a number or string */
		if (!empty1)
		    clear_tv(&var1);
		clear_tv(&var2);
		return FAIL;
	    }
	}

	/* Check for the ']'. */
	if (**arg != ']')
	{
	    if (verbose)
		EMSG(_(e_missbrac));
	    clear_tv(&var1);
	    if (range)
		clear_tv(&var2);
	    return FAIL;
	}
	*arg = skipwhite(*arg + 1);	/* skip the ']' */
    }

    if (evaluate)
    {
	n1 = 0;
	if (!empty1 && rettv->v_type != VAR_DICT)
	{
	    n1 = get_tv_number(&var1);
	    clear_tv(&var1);
	}
	if (range)
	{
	    if (empty2)
		n2 = -1;
	    else
	    {
		n2 = get_tv_number(&var2);
		clear_tv(&var2);
	    }
	}

	switch (rettv->v_type)
	{
	    case VAR_SPECIAL:
	    case VAR_FUNC:
	    case VAR_FLOAT:
	    case VAR_UNKNOWN:
		break; /* not evaluating, skipping over subscript */

	    case VAR_NUMBER:
	    case VAR_STRING:
		s = get_tv_string(rettv);
		len = (long)STRLEN(s);
		if (range)
		{
		    /* The resulting variable is a substring.  If the indexes
		     * are out of range the result is empty. */
		    if (n1 < 0)
		    {
			n1 = len + n1;
			if (n1 < 0)
			    n1 = 0;
		    }
		    if (n2 < 0)
			n2 = len + n2;
		    else if (n2 >= len)
			n2 = len;
		    if (n1 >= len || n2 < 0 || n1 > n2)
			s = NULL;
		    else
			s = vim_strnsave(s + n1, (int)(n2 - n1 + 1));
		}
		else
		{
		    /* The resulting variable is a string of a single
		     * character.  If the index is too big or negative the
		     * result is empty. */
		    if (n1 >= len || n1 < 0)
			s = NULL;
		    else
			s = vim_strnsave(s + n1, 1);
		}
		clear_tv(rettv);
		rettv->v_type = VAR_STRING;
		rettv->vval.v_string = s;
		break;

	    case VAR_LIST:
		len = list_len(rettv->vval.v_list);
		if (n1 < 0)
		    n1 = len + n1;
		if (!empty1 && (n1 < 0 || n1 >= len))
		{
		    /* For a range we allow invalid values and return an empty
		     * list.  A list index out of range is an error. */
		    if (!range)
		    {
			if (verbose)
			    EMSGN(_(e_listidx), n1);
			return FAIL;
		    }
		    n1 = len;
		}
		if (range)
		{
		    list_T	*l;
		    listitem_T	*item;

		    if (n2 < 0)
			n2 = len + n2;
		    else if (n2 >= len)
			n2 = len - 1;
		    if (!empty2 && (n2 < 0 || n2 + 1 < n1))
			n2 = -1;
		    l = list_alloc();
		    if (l == NULL)
			return FAIL;
		    for (item = list_find(rettv->vval.v_list, n1);
							       n1 <= n2; ++n1)
		    {
			if (list_append_tv(l, &item->li_tv) == FAIL)
			{
			    list_free(l, TRUE);
			    return FAIL;
			}
			item = item->li_next;
		    }
		    clear_tv(rettv);
		    rettv->v_type = VAR_LIST;
		    rettv->vval.v_list = l;
		    ++l->lv_refcount;
		}
		else
		{
		    copy_tv(&list_find(rettv->vval.v_list, n1)->li_tv, &var1);
		    clear_tv(rettv);
		    *rettv = var1;
		}
		break;

	    case VAR_DICT:
		if (range)
		{
		    if (verbose)
			EMSG(_(e_dictrange));
		    if (len == -1)
			clear_tv(&var1);
		    return FAIL;
		}
		{
		    dictitem_T	*item;

		    if (len == -1)
		    {
			key = get_tv_string(&var1);
			if (*key == NUL)
			{
			    if (verbose)
				EMSG(_(e_emptykey));
			    clear_tv(&var1);
			    return FAIL;
			}
		    }

		    item = dict_find(rettv->vval.v_dict, key, (int)len);

		    if (item == NULL && verbose)
			EMSG2(_(e_dictkey), key);
		    if (len == -1)
			clear_tv(&var1);
		    if (item == NULL)
			return FAIL;

		    copy_tv(&item->di_tv, &var1);
		    clear_tv(rettv);
		    *rettv = var1;
		}
		break;
	}
    }

    return OK;
}

/*
 * Get an option value.
 * "arg" points to the '&' or '+' before the option name.
 * "arg" is advanced to character after the option name.
 * Return OK or FAIL.
 */
    static int
get_option_tv(
    char_u	**arg,
    typval_T	*rettv,	/* when NULL, only check if option exists */
    int		evaluate)
{
    char_u	*option_end;
    long	numval;
    char_u	*stringval;
    int		opt_type;
    int		c;
    int		working = (**arg == '+');    /* has("+option") */
    int		ret = OK;
    int		opt_flags;

    /*
     * Isolate the option name and find its value.
     */
    option_end = find_option_end(arg, &opt_flags);
    if (option_end == NULL)
    {
	if (rettv != NULL)
	    EMSG2(_("E112: Option name missing: %s"), *arg);
	return FAIL;
    }

    if (!evaluate)
    {
	*arg = option_end;
	return OK;
    }

    c = *option_end;
    *option_end = NUL;
    opt_type = get_option_value(*arg, &numval,
			       rettv == NULL ? NULL : &stringval, opt_flags);

    if (opt_type == -3)			/* invalid name */
    {
	if (rettv != NULL)
	    EMSG2(_("E113: Unknown option: %s"), *arg);
	ret = FAIL;
    }
    else if (rettv != NULL)
    {
	if (opt_type == -2)		/* hidden string option */
	{
	    rettv->v_type = VAR_STRING;
	    rettv->vval.v_string = NULL;
	}
	else if (opt_type == -1)	/* hidden number option */
	{
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = 0;
	}
	else if (opt_type == 1)		/* number option */
	{
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = numval;
	}
	else				/* string option */
	{
	    rettv->v_type = VAR_STRING;
	    rettv->vval.v_string = stringval;
	}
    }
    else if (working && (opt_type == -2 || opt_type == -1))
	ret = FAIL;

    *option_end = c;		    /* put back for error messages */
    *arg = option_end;

    return ret;
}

/*
 * Allocate a variable for a string constant.
 * Return OK or FAIL.
 */
    static int
get_string_tv(char_u **arg, typval_T *rettv, int evaluate)
{
    char_u	*p;
    char_u	*name;
    int		extra = 0;

    /*
     * Find the end of the string, skipping backslashed characters.
     */
    for (p = *arg + 1; *p != NUL && *p != '"'; mb_ptr_adv(p))
    {
	if (*p == '\\' && p[1] != NUL)
	{
	    ++p;
	    /* A "\<x>" form occupies at least 4 characters, and produces up
	     * to 6 characters: reserve space for 2 extra */
	    if (*p == '<')
		extra += 2;
	}
    }

    if (*p != '"')
    {
	EMSG2(_("E114: Missing quote: %s"), *arg);
	return FAIL;
    }

    /* If only parsing, set *arg and return here */
    if (!evaluate)
    {
	*arg = p + 1;
	return OK;
    }

    /*
     * Copy the string into allocated memory, handling backslashed
     * characters.
     */
    name = alloc((unsigned)(p - *arg + extra));
    if (name == NULL)
	return FAIL;
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = name;

    for (p = *arg + 1; *p != NUL && *p != '"'; )
    {
	if (*p == '\\')
	{
	    switch (*++p)
	    {
		case 'b': *name++ = BS; ++p; break;
		case 'e': *name++ = ESC; ++p; break;
		case 'f': *name++ = FF; ++p; break;
		case 'n': *name++ = NL; ++p; break;
		case 'r': *name++ = CAR; ++p; break;
		case 't': *name++ = TAB; ++p; break;

		case 'X': /* hex: "\x1", "\x12" */
		case 'x':
		case 'u': /* Unicode: "\u0023" */
		case 'U':
			  if (vim_isxdigit(p[1]))
			  {
			      int	n, nr;
			      int	c = toupper(*p);

			      if (c == 'X')
				  n = 2;
			      else if (*p == 'u')
				  n = 4;
			      else
				  n = 8;
			      nr = 0;
			      while (--n >= 0 && vim_isxdigit(p[1]))
			      {
				  ++p;
				  nr = (nr << 4) + hex2nr(*p);
			      }
			      ++p;
#ifdef FEAT_MBYTE
			      /* For "\u" store the number according to
			       * 'encoding'. */
			      if (c != 'X')
				  name += (*mb_char2bytes)(nr, name);
			      else
#endif
				  *name++ = nr;
			  }
			  break;

			  /* octal: "\1", "\12", "\123" */
		case '0':
		case '1':
		case '2':
		case '3':
		case '4':
		case '5':
		case '6':
		case '7': *name = *p++ - '0';
			  if (*p >= '0' && *p <= '7')
			  {
			      *name = (*name << 3) + *p++ - '0';
			      if (*p >= '0' && *p <= '7')
				  *name = (*name << 3) + *p++ - '0';
			  }
			  ++name;
			  break;

			    /* Special key, e.g.: "\<C-W>" */
		case '<': extra = trans_special(&p, name, TRUE);
			  if (extra != 0)
			  {
			      name += extra;
			      break;
			  }
			  /* FALLTHROUGH */

		default:  MB_COPY_CHAR(p, name);
			  break;
	    }
	}
	else
	    MB_COPY_CHAR(p, name);

    }
    *name = NUL;
    *arg = p + 1;

    return OK;
}

/*
 * Allocate a variable for a 'str''ing' constant.
 * Return OK or FAIL.
 */
    static int
get_lit_string_tv(char_u **arg, typval_T *rettv, int evaluate)
{
    char_u	*p;
    char_u	*str;
    int		reduce = 0;

    /*
     * Find the end of the string, skipping ''.
     */
    for (p = *arg + 1; *p != NUL; mb_ptr_adv(p))
    {
	if (*p == '\'')
	{
	    if (p[1] != '\'')
		break;
	    ++reduce;
	    ++p;
	}
    }

    if (*p != '\'')
    {
	EMSG2(_("E115: Missing quote: %s"), *arg);
	return FAIL;
    }

    /* If only parsing return after setting "*arg" */
    if (!evaluate)
    {
	*arg = p + 1;
	return OK;
    }

    /*
     * Copy the string into allocated memory, handling '' to ' reduction.
     */
    str = alloc((unsigned)((p - *arg) - reduce));
    if (str == NULL)
	return FAIL;
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = str;

    for (p = *arg + 1; *p != NUL; )
    {
	if (*p == '\'')
	{
	    if (p[1] != '\'')
		break;
	    ++p;
	}
	MB_COPY_CHAR(p, str);
    }
    *str = NUL;
    *arg = p + 1;

    return OK;
}

/*
 * Allocate a variable for a List and fill it from "*arg".
 * Return OK or FAIL.
 */
    static int
get_list_tv(char_u **arg, typval_T *rettv, int evaluate)
{
    list_T	*l = NULL;
    typval_T	tv;
    listitem_T	*item;

    if (evaluate)
    {
	l = list_alloc();
	if (l == NULL)
	    return FAIL;
    }

    *arg = skipwhite(*arg + 1);
    while (**arg != ']' && **arg != NUL)
    {
	if (eval1(arg, &tv, evaluate) == FAIL)	/* recursive! */
	    goto failret;
	if (evaluate)
	{
	    item = listitem_alloc();
	    if (item != NULL)
	    {
		item->li_tv = tv;
		item->li_tv.v_lock = 0;
		list_append(l, item);
	    }
	    else
		clear_tv(&tv);
	}

	if (**arg == ']')
	    break;
	if (**arg != ',')
	{
	    EMSG2(_("E696: Missing comma in List: %s"), *arg);
	    goto failret;
	}
	*arg = skipwhite(*arg + 1);
    }

    if (**arg != ']')
    {
	EMSG2(_("E697: Missing end of List ']': %s"), *arg);
failret:
	if (evaluate)
	    list_free(l, TRUE);
	return FAIL;
    }

    *arg = skipwhite(*arg + 1);
    if (evaluate)
    {
	rettv->v_type = VAR_LIST;
	rettv->vval.v_list = l;
	++l->lv_refcount;
    }

    return OK;
}

/*
 * Allocate an empty header for a list.
 * Caller should take care of the reference count.
 */
    list_T *
list_alloc(void)
{
    list_T  *l;

    l = (list_T *)alloc_clear(sizeof(list_T));
    if (l != NULL)
    {
	/* Prepend the list to the list of lists for garbage collection. */
	if (first_list != NULL)
	    first_list->lv_used_prev = l;
	l->lv_used_prev = NULL;
	l->lv_used_next = first_list;
	first_list = l;
    }
    return l;
}

/*
 * Allocate an empty list for a return value.
 * Returns OK or FAIL.
 */
    int
rettv_list_alloc(typval_T *rettv)
{
    list_T	*l = list_alloc();

    if (l == NULL)
	return FAIL;

    rettv->vval.v_list = l;
    rettv->v_type = VAR_LIST;
    ++l->lv_refcount;
    return OK;
}

/*
 * Unreference a list: decrement the reference count and free it when it
 * becomes zero.
 */
    void
list_unref(list_T *l)
{
    if (l != NULL && --l->lv_refcount <= 0)
	list_free(l, TRUE);
}

/*
 * Free a list, including all non-container items it points to.
 * Ignores the reference count.
 */
    void
list_free(
    list_T  *l,
    int	    recurse)	/* Free Lists and Dictionaries recursively. */
{
    listitem_T *item;

    /* Remove the list from the list of lists for garbage collection. */
    if (l->lv_used_prev == NULL)
	first_list = l->lv_used_next;
    else
	l->lv_used_prev->lv_used_next = l->lv_used_next;
    if (l->lv_used_next != NULL)
	l->lv_used_next->lv_used_prev = l->lv_used_prev;

    for (item = l->lv_first; item != NULL; item = l->lv_first)
    {
	/* Remove the item before deleting it. */
	l->lv_first = item->li_next;
	if (recurse || (item->li_tv.v_type != VAR_LIST
					   && item->li_tv.v_type != VAR_DICT))
	    clear_tv(&item->li_tv);
	vim_free(item);
    }
    vim_free(l);
}

/*
 * Allocate a list item.
 * It is not initialized, don't forget to set v_lock.
 */
    listitem_T *
listitem_alloc(void)
{
    return (listitem_T *)alloc(sizeof(listitem_T));
}

/*
 * Free a list item.  Also clears the value.  Does not notify watchers.
 */
    void
listitem_free(listitem_T *item)
{
    clear_tv(&item->li_tv);
    vim_free(item);
}

/*
 * Remove a list item from a List and free it.  Also clears the value.
 */
    void
listitem_remove(list_T *l, listitem_T *item)
{
    vimlist_remove(l, item, item);
    listitem_free(item);
}

/*
 * Get the number of items in a list.
 */
    static long
list_len(list_T *l)
{
    if (l == NULL)
	return 0L;
    return l->lv_len;
}

/*
 * Return TRUE when two lists have exactly the same values.
 */
    static int
list_equal(
    list_T	*l1,
    list_T	*l2,
    int		ic,	/* ignore case for strings */
    int		recursive)  /* TRUE when used recursively */
{
    listitem_T	*item1, *item2;

    if (l1 == NULL || l2 == NULL)
	return FALSE;
    if (l1 == l2)
	return TRUE;
    if (list_len(l1) != list_len(l2))
	return FALSE;

    for (item1 = l1->lv_first, item2 = l2->lv_first;
	    item1 != NULL && item2 != NULL;
			       item1 = item1->li_next, item2 = item2->li_next)
	if (!tv_equal(&item1->li_tv, &item2->li_tv, ic, recursive))
	    return FALSE;
    return item1 == NULL && item2 == NULL;
}

/*
 * Return the dictitem that an entry in a hashtable points to.
 */
    dictitem_T *
dict_lookup(hashitem_T *hi)
{
    return HI2DI(hi);
}

/*
 * Return TRUE when two dictionaries have exactly the same key/values.
 */
    static int
dict_equal(
    dict_T	*d1,
    dict_T	*d2,
    int		ic,	/* ignore case for strings */
    int		recursive) /* TRUE when used recursively */
{
    hashitem_T	*hi;
    dictitem_T	*item2;
    int		todo;

    if (d1 == NULL || d2 == NULL)
	return FALSE;
    if (d1 == d2)
	return TRUE;
    if (dict_len(d1) != dict_len(d2))
	return FALSE;

    todo = (int)d1->dv_hashtab.ht_used;
    for (hi = d1->dv_hashtab.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    item2 = dict_find(d2, hi->hi_key, -1);
	    if (item2 == NULL)
		return FALSE;
	    if (!tv_equal(&HI2DI(hi)->di_tv, &item2->di_tv, ic, recursive))
		return FALSE;
	    --todo;
	}
    }
    return TRUE;
}

static int tv_equal_recurse_limit;

/*
 * Return TRUE if "tv1" and "tv2" have the same value.
 * Compares the items just like "==" would compare them, but strings and
 * numbers are different.  Floats and numbers are also different.
 */
    static int
tv_equal(
    typval_T *tv1,
    typval_T *tv2,
    int	     ic,	    /* ignore case */
    int	     recursive)	    /* TRUE when used recursively */
{
    char_u	buf1[NUMBUFLEN], buf2[NUMBUFLEN];
    char_u	*s1, *s2;
    static int  recursive_cnt = 0;	    /* catch recursive loops */
    int		r;

    if (tv1->v_type != tv2->v_type)
	return FALSE;

    /* Catch lists and dicts that have an endless loop by limiting
     * recursiveness to a limit.  We guess they are equal then.
     * A fixed limit has the problem of still taking an awful long time.
     * Reduce the limit every time running into it. That should work fine for
     * deeply linked structures that are not recursively linked and catch
     * recursiveness quickly. */
    if (!recursive)
	tv_equal_recurse_limit = 1000;
    if (recursive_cnt >= tv_equal_recurse_limit)
    {
	--tv_equal_recurse_limit;
	return TRUE;
    }

    switch (tv1->v_type)
    {
	case VAR_UNKNOWN:
	    break;

	case VAR_LIST:
	    ++recursive_cnt;
	    r = list_equal(tv1->vval.v_list, tv2->vval.v_list, ic, TRUE);
	    --recursive_cnt;
	    return r;

	case VAR_DICT:
	    ++recursive_cnt;
	    r = dict_equal(tv1->vval.v_dict, tv2->vval.v_dict, ic, TRUE);
	    --recursive_cnt;
	    return r;

	case VAR_FUNC:
	    return (tv1->vval.v_string != NULL
		    && tv2->vval.v_string != NULL
		    && STRCMP(tv1->vval.v_string, tv2->vval.v_string) == 0);

	case VAR_NUMBER:
	    return tv1->vval.v_number == tv2->vval.v_number;

#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    return tv1->vval.v_float == tv2->vval.v_float;
#endif

	case VAR_STRING:
	    s1 = get_tv_string_buf(tv1, buf1);
	    s2 = get_tv_string_buf(tv2, buf2);
	    return ((ic ? MB_STRICMP(s1, s2) : STRCMP(s1, s2)) == 0);

	case VAR_SPECIAL:
	    return tv1->vval.v_number == tv2->vval.v_number;
    }

    /* VAR_UNKNOWN can be the result of a invalid expression, let's say it
     * does not equal anything, not even itself. */
    return FALSE;
}

/*
 * Locate item with index "n" in list "l" and return it.
 * A negative index is counted from the end; -1 is the last item.
 * Returns NULL when "n" is out of range.
 */
    listitem_T *
list_find(list_T *l, long n)
{
    listitem_T	*item;
    long	idx;

    if (l == NULL)
	return NULL;

    /* Negative index is relative to the end. */
    if (n < 0)
	n = l->lv_len + n;

    /* Check for index out of range. */
    if (n < 0 || n >= l->lv_len)
	return NULL;

    /* When there is a cached index may start search from there. */
    if (l->lv_idx_item != NULL)
    {
	if (n < l->lv_idx / 2)
	{
	    /* closest to the start of the list */
	    item = l->lv_first;
	    idx = 0;
	}
	else if (n > (l->lv_idx + l->lv_len) / 2)
	{
	    /* closest to the end of the list */
	    item = l->lv_last;
	    idx = l->lv_len - 1;
	}
	else
	{
	    /* closest to the cached index */
	    item = l->lv_idx_item;
	    idx = l->lv_idx;
	}
    }
    else
    {
	if (n < l->lv_len / 2)
	{
	    /* closest to the start of the list */
	    item = l->lv_first;
	    idx = 0;
	}
	else
	{
	    /* closest to the end of the list */
	    item = l->lv_last;
	    idx = l->lv_len - 1;
	}
    }

    while (n > idx)
    {
	/* search forward */
	item = item->li_next;
	++idx;
    }
    while (n < idx)
    {
	/* search backward */
	item = item->li_prev;
	--idx;
    }

    /* cache the used index */
    l->lv_idx = idx;
    l->lv_idx_item = item;

    return item;
}

/*
 * Get list item "l[idx]" as a number.
 */
    static long
list_find_nr(
    list_T	*l,
    long	idx,
    int		*errorp)	/* set to TRUE when something wrong */
{
    listitem_T	*li;

    li = list_find(l, idx);
    if (li == NULL)
    {
	if (errorp != NULL)
	    *errorp = TRUE;
	return -1L;
    }
    return get_tv_number_chk(&li->li_tv, errorp);
}

/*
 * Get list item "l[idx - 1]" as a string.  Returns NULL for failure.
 */
    char_u *
list_find_str(list_T *l, long idx)
{
    listitem_T	*li;

    li = list_find(l, idx - 1);
    if (li == NULL)
    {
	EMSGN(_(e_listidx), idx);
	return NULL;
    }
    return get_tv_string(&li->li_tv);
}

/*
 * Locate "item" list "l" and return its index.
 * Returns -1 when "item" is not in the list.
 */
    static long
list_idx_of_item(list_T *l, listitem_T *item)
{
    long	idx = 0;
    listitem_T	*li;

    if (l == NULL)
	return -1;
    idx = 0;
    for (li = l->lv_first; li != NULL && li != item; li = li->li_next)
	++idx;
    if (li == NULL)
	return -1;
    return idx;
}

/*
 * Append item "item" to the end of list "l".
 */
    void
list_append(list_T *l, listitem_T *item)
{
    if (l->lv_last == NULL)
    {
	/* empty list */
	l->lv_first = item;
	l->lv_last = item;
	item->li_prev = NULL;
    }
    else
    {
	l->lv_last->li_next = item;
	item->li_prev = l->lv_last;
	l->lv_last = item;
    }
    ++l->lv_len;
    item->li_next = NULL;
}

/*
 * Append typval_T "tv" to the end of list "l".
 * Return FAIL when out of memory.
 */
    int
list_append_tv(list_T *l, typval_T *tv)
{
    listitem_T	*li = listitem_alloc();

    if (li == NULL)
	return FAIL;
    copy_tv(tv, &li->li_tv);
    list_append(l, li);
    return OK;
}

/*
 * Add a dictionary to a list.  Used by getqflist().
 * Return FAIL when out of memory.
 */
    int
list_append_dict(list_T *list, dict_T *dict)
{
    listitem_T	*li = listitem_alloc();

    if (li == NULL)
	return FAIL;
    li->li_tv.v_type = VAR_DICT;
    li->li_tv.v_lock = 0;
    li->li_tv.vval.v_dict = dict;
    list_append(list, li);
    ++dict->dv_refcount;
    return OK;
}

/*
 * Make a copy of "str" and append it as an item to list "l".
 * When "len" >= 0 use "str[len]".
 * Returns FAIL when out of memory.
 */
    int
list_append_string(list_T *l, char_u *str, int len)
{
    listitem_T *li = listitem_alloc();

    if (li == NULL)
	return FAIL;
    list_append(l, li);
    li->li_tv.v_type = VAR_STRING;
    li->li_tv.v_lock = 0;
    if (str == NULL)
	li->li_tv.vval.v_string = NULL;
    else if ((li->li_tv.vval.v_string = (len >= 0 ? vim_strnsave(str, len)
						 : vim_strsave(str))) == NULL)
	return FAIL;
    return OK;
}

/*
 * Append "n" to list "l".
 * Returns FAIL when out of memory.
 */
    static int
list_append_number(list_T *l, varnumber_T n)
{
    listitem_T	*li;

    li = listitem_alloc();
    if (li == NULL)
	return FAIL;
    li->li_tv.v_type = VAR_NUMBER;
    li->li_tv.v_lock = 0;
    li->li_tv.vval.v_number = n;
    list_append(l, li);
    return OK;
}

/*
 * Insert typval_T "tv" in list "l" before "item".
 * If "item" is NULL append at the end.
 * Return FAIL when out of memory.
 */
    int
list_insert_tv(list_T *l, typval_T *tv, listitem_T *item)
{
    listitem_T	*ni = listitem_alloc();

    if (ni == NULL)
	return FAIL;
    copy_tv(tv, &ni->li_tv);
    list_insert(l, ni, item);
    return OK;
}

    void
list_insert(list_T *l, listitem_T *ni, listitem_T *item)
{
    if (item == NULL)
	/* Append new item at end of list. */
	list_append(l, ni);
    else
    {
	/* Insert new item before existing item. */
	ni->li_prev = item->li_prev;
	ni->li_next = item;
	if (item->li_prev == NULL)
	{
	    l->lv_first = ni;
	    ++l->lv_idx;
	}
	else
	{
	    item->li_prev->li_next = ni;
	    l->lv_idx_item = NULL;
	}
	item->li_prev = ni;
	++l->lv_len;
    }
}

/*
 * Extend "l1" with "l2".
 * If "bef" is NULL append at the end, otherwise insert before this item.
 * Returns FAIL when out of memory.
 */
    static int
list_extend(list_T *l1, list_T *l2, listitem_T *bef)
{
    listitem_T	*item;
    int		todo = l2->lv_len;

    /* We also quit the loop when we have inserted the original item count of
     * the list, avoid a hang when we extend a list with itself. */
    for (item = l2->lv_first; item != NULL && --todo >= 0; item = item->li_next)
	if (list_insert_tv(l1, &item->li_tv, bef) == FAIL)
	    return FAIL;
    return OK;
}

/*
 * Concatenate lists "l1" and "l2" into a new list, stored in "tv".
 * Return FAIL when out of memory.
 */
    static int
list_concat(list_T *l1, list_T *l2, typval_T *tv)
{
    list_T	*l;

    if (l1 == NULL || l2 == NULL)
	return FAIL;

    /* make a copy of the first list. */
    l = list_copy(l1, FALSE, 0);
    if (l == NULL)
	return FAIL;
    tv->v_type = VAR_LIST;
    tv->vval.v_list = l;

    /* append all items from the second list */
    return list_extend(l, l2, NULL);
}

/*
 * Make a copy of list "orig".  Shallow if "deep" is FALSE.
 * The refcount of the new list is set to 1.
 * See item_copy() for "copyID".
 * Returns NULL when out of memory.
 */
    static list_T *
list_copy(list_T *orig, int deep, int copyID)
{
    list_T	*copy;
    listitem_T	*item;
    listitem_T	*ni;

    if (orig == NULL)
	return NULL;

    copy = list_alloc();
    if (copy != NULL)
    {
	if (copyID != 0)
	{
	    /* Do this before adding the items, because one of the items may
	     * refer back to this list. */
	    orig->lv_copyID = copyID;
	    orig->lv_copylist = copy;
	}
	for (item = orig->lv_first; item != NULL && !got_int;
							 item = item->li_next)
	{
	    ni = listitem_alloc();
	    if (ni == NULL)
		break;
	    if (deep)
	    {
		if (item_copy(&item->li_tv, &ni->li_tv, deep, copyID) == FAIL)
		{
		    vim_free(ni);
		    break;
		}
	    }
	    else
		copy_tv(&item->li_tv, &ni->li_tv);
	    list_append(copy, ni);
	}
	++copy->lv_refcount;
	if (item != NULL)
	{
	    list_unref(copy);
	    copy = NULL;
	}
    }

    return copy;
}

/*
 * Remove items "item" to "item2" from list "l".
 * Does not free the listitem or the value!
 * This used to be called list_remove, but that conflicts with a Sun header
 * file.
 */
    void
vimlist_remove(list_T *l, listitem_T *item, listitem_T *item2)
{
    listitem_T	*ip;

    /* notify watchers */
    for (ip = item; ip != NULL; ip = ip->li_next)
    {
	--l->lv_len;
	list_fix_watch(l, ip);
	if (ip == item2)
	    break;
    }

    if (item2->li_next == NULL)
	l->lv_last = item->li_prev;
    else
	item2->li_next->li_prev = item->li_prev;
    if (item->li_prev == NULL)
	l->lv_first = item2->li_next;
    else
	item->li_prev->li_next = item2->li_next;
    l->lv_idx_item = NULL;
}

/*
 * Return an allocated string with the string representation of a list.
 * May return NULL.
 */
    static char_u *
list2string(typval_T *tv, int copyID)
{
    garray_T	ga;

    if (tv->vval.v_list == NULL)
	return NULL;
    ga_init2(&ga, (int)sizeof(char), 80);
    ga_append(&ga, '[');
    if (list_join(&ga, tv->vval.v_list, (char_u *)", ", FALSE, copyID) == FAIL)
    {
	vim_free(ga.ga_data);
	return NULL;
    }
    ga_append(&ga, ']');
    ga_append(&ga, NUL);
    return (char_u *)ga.ga_data;
}

typedef struct join_S {
    char_u	*s;
    char_u	*tofree;
} join_T;

    static int
list_join_inner(
    garray_T	*gap,		/* to store the result in */
    list_T	*l,
    char_u	*sep,
    int		echo_style,
    int		copyID,
    garray_T	*join_gap)	/* to keep each list item string */
{
    int		i;
    join_T	*p;
    int		len;
    int		sumlen = 0;
    int		first = TRUE;
    char_u	*tofree;
    char_u	numbuf[NUMBUFLEN];
    listitem_T	*item;
    char_u	*s;

    /* Stringify each item in the list. */
    for (item = l->lv_first; item != NULL && !got_int; item = item->li_next)
    {
	if (echo_style)
	    s = echo_string(&item->li_tv, &tofree, numbuf, copyID);
	else
	    s = tv2string(&item->li_tv, &tofree, numbuf, copyID);
	if (s == NULL)
	    return FAIL;

	len = (int)STRLEN(s);
	sumlen += len;

	(void)ga_grow(join_gap, 1);
	p = ((join_T *)join_gap->ga_data) + (join_gap->ga_len++);
	if (tofree != NULL || s != numbuf)
	{
	    p->s = s;
	    p->tofree = tofree;
	}
	else
	{
	    p->s = vim_strnsave(s, len);
	    p->tofree = p->s;
	}

	line_breakcheck();
	if (did_echo_string_emsg)  /* recursion error, bail out */
	    break;
    }

    /* Allocate result buffer with its total size, avoid re-allocation and
     * multiple copy operations.  Add 2 for a tailing ']' and NUL. */
    if (join_gap->ga_len >= 2)
	sumlen += (int)STRLEN(sep) * (join_gap->ga_len - 1);
    if (ga_grow(gap, sumlen + 2) == FAIL)
	return FAIL;

    for (i = 0; i < join_gap->ga_len && !got_int; ++i)
    {
	if (first)
	    first = FALSE;
	else
	    ga_concat(gap, sep);
	p = ((join_T *)join_gap->ga_data) + i;

	if (p->s != NULL)
	    ga_concat(gap, p->s);
	line_breakcheck();
    }

    return OK;
}

/*
 * Join list "l" into a string in "*gap", using separator "sep".
 * When "echo_style" is TRUE use String as echoed, otherwise as inside a List.
 * Return FAIL or OK.
 */
    static int
list_join(
    garray_T	*gap,
    list_T	*l,
    char_u	*sep,
    int		echo_style,
    int		copyID)
{
    garray_T	join_ga;
    int		retval;
    join_T	*p;
    int		i;

    if (l->lv_len < 1)
	return OK; /* nothing to do */
    ga_init2(&join_ga, (int)sizeof(join_T), l->lv_len);
    retval = list_join_inner(gap, l, sep, echo_style, copyID, &join_ga);

    /* Dispose each item in join_ga. */
    if (join_ga.ga_data != NULL)
    {
	p = (join_T *)join_ga.ga_data;
	for (i = 0; i < join_ga.ga_len; ++i)
	{
	    vim_free(p->tofree);
	    ++p;
	}
	ga_clear(&join_ga);
    }

    return retval;
}

/*
 * Return the next (unique) copy ID.
 * Used for serializing nested structures.
 */
    int
get_copyID(void)
{
    current_copyID += COPYID_INC;
    return current_copyID;
}

/*
 * Garbage collection for lists and dictionaries.
 *
 * We use reference counts to be able to free most items right away when they
 * are no longer used.  But for composite items it's possible that it becomes
 * unused while the reference count is > 0: When there is a recursive
 * reference.  Example:
 *	:let l = [1, 2, 3]
 *	:let d = {9: l}
 *	:let l[1] = d
 *
 * Since this is quite unusual we handle this with garbage collection: every
 * once in a while find out which lists and dicts are not referenced from any
 * variable.
 *
 * Here is a good reference text about garbage collection (refers to Python
 * but it applies to all reference-counting mechanisms):
 *	http://python.ca/nas/python/gc/
 */

/*
 * Do garbage collection for lists and dicts.
 * Return TRUE if some memory was freed.
 */
    int
garbage_collect(void)
{
    int		copyID;
    int		abort = FALSE;
    buf_T	*buf;
    win_T	*wp;
    int		i;
    funccall_T	*fc, **pfc;
    int		did_free = FALSE;
    int		did_free_funccal = FALSE;
#ifdef FEAT_WINDOWS
    tabpage_T	*tp;
#endif

    /* Only do this once. */
    want_garbage_collect = FALSE;
    may_garbage_collect = FALSE;
    garbage_collect_at_exit = FALSE;

    /* We advance by two because we add one for items referenced through
     * previous_funccal. */
    copyID = get_copyID();

    /*
     * 1. Go through all accessible variables and mark all lists and dicts
     *    with copyID.
     */

    /* Don't free variables in the previous_funccal list unless they are only
     * referenced through previous_funccal.  This must be first, because if
     * the item is referenced elsewhere the funccal must not be freed. */
    for (fc = previous_funccal; fc != NULL; fc = fc->caller)
    {
	abort = abort || set_ref_in_ht(&fc->l_vars.dv_hashtab, copyID + 1,
									NULL);
	abort = abort || set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID + 1,
									NULL);
    }

    /* script-local variables */
    for (i = 1; i <= ga_scripts.ga_len; ++i)
	abort = abort || set_ref_in_ht(&SCRIPT_VARS(i), copyID, NULL);

    /* buffer-local variables */
    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
	abort = abort || set_ref_in_item(&buf->b_bufvar.di_tv, copyID,
								  NULL, NULL);

    /* window-local variables */
    FOR_ALL_TAB_WINDOWS(tp, wp)
	abort = abort || set_ref_in_item(&wp->w_winvar.di_tv, copyID,
								  NULL, NULL);
#ifdef FEAT_AUTOCMD
    if (aucmd_win != NULL)
	abort = abort || set_ref_in_item(&aucmd_win->w_winvar.di_tv, copyID,
								  NULL, NULL);
#endif

#ifdef FEAT_WINDOWS
    /* tabpage-local variables */
    for (tp = first_tabpage; tp != NULL; tp = tp->tp_next)
	abort = abort || set_ref_in_item(&tp->tp_winvar.di_tv, copyID,
								  NULL, NULL);
#endif

    /* global variables */
    abort = abort || set_ref_in_ht(&globvarht, copyID, NULL);

    /* function-local variables */
    for (fc = current_funccal; fc != NULL; fc = fc->caller)
    {
	abort = abort || set_ref_in_ht(&fc->l_vars.dv_hashtab, copyID, NULL);
	abort = abort || set_ref_in_ht(&fc->l_avars.dv_hashtab, copyID, NULL);
    }

    /* v: vars */
    abort = abort || set_ref_in_ht(&vimvarht, copyID, NULL);

#ifdef FEAT_LUA
    abort = abort || set_ref_in_lua(copyID);
#endif

#ifdef FEAT_PYTHON
    abort = abort || set_ref_in_python(copyID);
#endif

#ifdef FEAT_PYTHON3
    abort = abort || set_ref_in_python3(copyID);
#endif

#ifdef FEAT_CHANNEL
    abort = abort || set_ref_in_channel(copyID);
#endif

    if (!abort)
    {
	/*
	 * 2. Free lists and dictionaries that are not referenced.
	 */
	did_free = free_unref_items(copyID);

	/*
	 * 3. Check if any funccal can be freed now.
	 */
	for (pfc = &previous_funccal; *pfc != NULL; )
	{
	    if (can_free_funccal(*pfc, copyID))
	    {
		fc = *pfc;
		*pfc = fc->caller;
		free_funccal(fc, TRUE);
		did_free = TRUE;
		did_free_funccal = TRUE;
	    }
	    else
		pfc = &(*pfc)->caller;
	}
	if (did_free_funccal)
	    /* When a funccal was freed some more items might be garbage
	     * collected, so run again. */
	    (void)garbage_collect();
    }
    else if (p_verbose > 0)
    {
	verb_msg((char_u *)_("Not enough memory to set references, garbage collection aborted!"));
    }

    return did_free;
}

/*
 * Free lists and dictionaries that are no longer referenced.
 */
    static int
free_unref_items(int copyID)
{
    dict_T	*dd, *dd_next;
    list_T	*ll, *ll_next;
    int		did_free = FALSE;

    /*
     * Go through the list of dicts and free items without the copyID.
     */
    for (dd = first_dict; dd != NULL; )
    {
	dd_next = dd->dv_used_next;
	if ((dd->dv_copyID & COPYID_MASK) != (copyID & COPYID_MASK))
	{
	    /* Free the Dictionary and ordinary items it contains, but don't
	     * recurse into Lists and Dictionaries, they will be in the list
	     * of dicts or list of lists. */
	    dict_free(dd, FALSE);
	    did_free = TRUE;
	}
	dd = dd_next;
    }

    /*
     * Go through the list of lists and free items without the copyID.
     * But don't free a list that has a watcher (used in a for loop), these
     * are not referenced anywhere.
     */
    for (ll = first_list; ll != NULL; )
    {
	ll_next = ll->lv_used_next;
	if ((ll->lv_copyID & COPYID_MASK) != (copyID & COPYID_MASK)
						      && ll->lv_watch == NULL)
	{
	    /* Free the List and ordinary items it contains, but don't recurse
	     * into Lists and Dictionaries, they will be in the list of dicts
	     * or list of lists. */
	    list_free(ll, FALSE);
	    did_free = TRUE;
	}
	ll = ll_next;
    }
    return did_free;
}

/*
 * Mark all lists and dicts referenced through hashtab "ht" with "copyID".
 * "list_stack" is used to add lists to be marked.  Can be NULL.
 *
 * Returns TRUE if setting references failed somehow.
 */
    int
set_ref_in_ht(hashtab_T *ht, int copyID, list_stack_T **list_stack)
{
    int		todo;
    int		abort = FALSE;
    hashitem_T	*hi;
    hashtab_T	*cur_ht;
    ht_stack_T	*ht_stack = NULL;
    ht_stack_T	*tempitem;

    cur_ht = ht;
    for (;;)
    {
	if (!abort)
	{
	    /* Mark each item in the hashtab.  If the item contains a hashtab
	     * it is added to ht_stack, if it contains a list it is added to
	     * list_stack. */
	    todo = (int)cur_ht->ht_used;
	    for (hi = cur_ht->ht_array; todo > 0; ++hi)
		if (!HASHITEM_EMPTY(hi))
		{
		    --todo;
		    abort = abort || set_ref_in_item(&HI2DI(hi)->di_tv, copyID,
						       &ht_stack, list_stack);
		}
	}

	if (ht_stack == NULL)
	    break;

	/* take an item from the stack */
	cur_ht = ht_stack->ht;
	tempitem = ht_stack;
	ht_stack = ht_stack->prev;
	free(tempitem);
    }

    return abort;
}

/*
 * Mark all lists and dicts referenced through list "l" with "copyID".
 * "ht_stack" is used to add hashtabs to be marked.  Can be NULL.
 *
 * Returns TRUE if setting references failed somehow.
 */
    int
set_ref_in_list(list_T *l, int copyID, ht_stack_T **ht_stack)
{
    listitem_T	 *li;
    int		 abort = FALSE;
    list_T	 *cur_l;
    list_stack_T *list_stack = NULL;
    list_stack_T *tempitem;

    cur_l = l;
    for (;;)
    {
	if (!abort)
	    /* Mark each item in the list.  If the item contains a hashtab
	     * it is added to ht_stack, if it contains a list it is added to
	     * list_stack. */
	    for (li = cur_l->lv_first; !abort && li != NULL; li = li->li_next)
		abort = abort || set_ref_in_item(&li->li_tv, copyID,
						       ht_stack, &list_stack);
	if (list_stack == NULL)
	    break;

	/* take an item from the stack */
	cur_l = list_stack->list;
	tempitem = list_stack;
	list_stack = list_stack->prev;
	free(tempitem);
    }

    return abort;
}

/*
 * Mark all lists and dicts referenced through typval "tv" with "copyID".
 * "list_stack" is used to add lists to be marked.  Can be NULL.
 * "ht_stack" is used to add hashtabs to be marked.  Can be NULL.
 *
 * Returns TRUE if setting references failed somehow.
 */
    int
set_ref_in_item(
    typval_T	    *tv,
    int		    copyID,
    ht_stack_T	    **ht_stack,
    list_stack_T    **list_stack)
{
    dict_T	*dd;
    list_T	*ll;
    int		abort = FALSE;

    if (tv->v_type == VAR_DICT)
    {
	dd = tv->vval.v_dict;
	if (dd != NULL && dd->dv_copyID != copyID)
	{
	    /* Didn't see this dict yet. */
	    dd->dv_copyID = copyID;
	    if (ht_stack == NULL)
	    {
		abort = set_ref_in_ht(&dd->dv_hashtab, copyID, list_stack);
	    }
	    else
	    {
		ht_stack_T *newitem = (ht_stack_T*)malloc(sizeof(ht_stack_T));
		if (newitem == NULL)
		    abort = TRUE;
		else
		{
		    newitem->ht = &dd->dv_hashtab;
		    newitem->prev = *ht_stack;
		    *ht_stack = newitem;
		}
	    }
	}
    }
    else if (tv->v_type == VAR_LIST)
    {
	ll = tv->vval.v_list;
	if (ll != NULL && ll->lv_copyID != copyID)
	{
	    /* Didn't see this list yet. */
	    ll->lv_copyID = copyID;
	    if (list_stack == NULL)
	    {
		abort = set_ref_in_list(ll, copyID, ht_stack);
	    }
	    else
	    {
		list_stack_T *newitem = (list_stack_T*)malloc(
							sizeof(list_stack_T));
		if (newitem == NULL)
		    abort = TRUE;
		else
		{
		    newitem->list = ll;
		    newitem->prev = *list_stack;
		    *list_stack = newitem;
		}
	    }
	}
    }
    return abort;
}

/*
 * Allocate an empty header for a dictionary.
 */
    dict_T *
dict_alloc(void)
{
    dict_T *d;

    d = (dict_T *)alloc(sizeof(dict_T));
    if (d != NULL)
    {
	/* Add the dict to the list of dicts for garbage collection. */
	if (first_dict != NULL)
	    first_dict->dv_used_prev = d;
	d->dv_used_next = first_dict;
	d->dv_used_prev = NULL;
	first_dict = d;

	hash_init(&d->dv_hashtab);
	d->dv_lock = 0;
	d->dv_scope = 0;
	d->dv_refcount = 0;
	d->dv_copyID = 0;
    }
    return d;
}

/*
 * Allocate an empty dict for a return value.
 * Returns OK or FAIL.
 */
    int
rettv_dict_alloc(typval_T *rettv)
{
    dict_T	*d = dict_alloc();

    if (d == NULL)
	return FAIL;

    rettv->vval.v_dict = d;
    rettv->v_type = VAR_DICT;
    ++d->dv_refcount;
    return OK;
}


/*
 * Unreference a Dictionary: decrement the reference count and free it when it
 * becomes zero.
 */
    void
dict_unref(dict_T *d)
{
    if (d != NULL && --d->dv_refcount <= 0)
	dict_free(d, TRUE);
}

/*
 * Free a Dictionary, including all non-container items it contains.
 * Ignores the reference count.
 */
    void
dict_free(
    dict_T  *d,
    int	    recurse)	/* Free Lists and Dictionaries recursively. */
{
    int		todo;
    hashitem_T	*hi;
    dictitem_T	*di;

    /* Remove the dict from the list of dicts for garbage collection. */
    if (d->dv_used_prev == NULL)
	first_dict = d->dv_used_next;
    else
	d->dv_used_prev->dv_used_next = d->dv_used_next;
    if (d->dv_used_next != NULL)
	d->dv_used_next->dv_used_prev = d->dv_used_prev;

    /* Lock the hashtab, we don't want it to resize while freeing items. */
    hash_lock(&d->dv_hashtab);
    todo = (int)d->dv_hashtab.ht_used;
    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    /* Remove the item before deleting it, just in case there is
	     * something recursive causing trouble. */
	    di = HI2DI(hi);
	    hash_remove(&d->dv_hashtab, hi);
	    if (recurse || (di->di_tv.v_type != VAR_LIST
					     && di->di_tv.v_type != VAR_DICT))
		clear_tv(&di->di_tv);
	    vim_free(di);
	    --todo;
	}
    }
    hash_clear(&d->dv_hashtab);
    vim_free(d);
}

/*
 * Allocate a Dictionary item.
 * The "key" is copied to the new item.
 * Note that the value of the item "di_tv" still needs to be initialized!
 * Returns NULL when out of memory.
 */
    dictitem_T *
dictitem_alloc(char_u *key)
{
    dictitem_T *di;

    di = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T) + STRLEN(key)));
    if (di != NULL)
    {
	STRCPY(di->di_key, key);
	di->di_flags = DI_FLAGS_ALLOC;
    }
    return di;
}

/*
 * Make a copy of a Dictionary item.
 */
    static dictitem_T *
dictitem_copy(dictitem_T *org)
{
    dictitem_T *di;

    di = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T)
						      + STRLEN(org->di_key)));
    if (di != NULL)
    {
	STRCPY(di->di_key, org->di_key);
	di->di_flags = DI_FLAGS_ALLOC;
	copy_tv(&org->di_tv, &di->di_tv);
    }
    return di;
}

/*
 * Remove item "item" from Dictionary "dict" and free it.
 */
    static void
dictitem_remove(dict_T *dict, dictitem_T *item)
{
    hashitem_T	*hi;

    hi = hash_find(&dict->dv_hashtab, item->di_key);
    if (HASHITEM_EMPTY(hi))
	EMSG2(_(e_intern2), "dictitem_remove()");
    else
	hash_remove(&dict->dv_hashtab, hi);
    dictitem_free(item);
}

/*
 * Free a dict item.  Also clears the value.
 */
    void
dictitem_free(dictitem_T *item)
{
    clear_tv(&item->di_tv);
    if (item->di_flags & DI_FLAGS_ALLOC)
	vim_free(item);
}

/*
 * Make a copy of dict "d".  Shallow if "deep" is FALSE.
 * The refcount of the new dict is set to 1.
 * See item_copy() for "copyID".
 * Returns NULL when out of memory.
 */
    static dict_T *
dict_copy(dict_T *orig, int deep, int copyID)
{
    dict_T	*copy;
    dictitem_T	*di;
    int		todo;
    hashitem_T	*hi;

    if (orig == NULL)
	return NULL;

    copy = dict_alloc();
    if (copy != NULL)
    {
	if (copyID != 0)
	{
	    orig->dv_copyID = copyID;
	    orig->dv_copydict = copy;
	}
	todo = (int)orig->dv_hashtab.ht_used;
	for (hi = orig->dv_hashtab.ht_array; todo > 0 && !got_int; ++hi)
	{
	    if (!HASHITEM_EMPTY(hi))
	    {
		--todo;

		di = dictitem_alloc(hi->hi_key);
		if (di == NULL)
		    break;
		if (deep)
		{
		    if (item_copy(&HI2DI(hi)->di_tv, &di->di_tv, deep,
							      copyID) == FAIL)
		    {
			vim_free(di);
			break;
		    }
		}
		else
		    copy_tv(&HI2DI(hi)->di_tv, &di->di_tv);
		if (dict_add(copy, di) == FAIL)
		{
		    dictitem_free(di);
		    break;
		}
	    }
	}

	++copy->dv_refcount;
	if (todo > 0)
	{
	    dict_unref(copy);
	    copy = NULL;
	}
    }

    return copy;
}

/*
 * Add item "item" to Dictionary "d".
 * Returns FAIL when out of memory and when key already exists.
 */
    int
dict_add(dict_T *d, dictitem_T *item)
{
    return hash_add(&d->dv_hashtab, item->di_key);
}

/*
 * Add a number or string entry to dictionary "d".
 * When "str" is NULL use number "nr", otherwise use "str".
 * Returns FAIL when out of memory and when key already exists.
 */
    int
dict_add_nr_str(
    dict_T	*d,
    char	*key,
    long	nr,
    char_u	*str)
{
    dictitem_T	*item;

    item = dictitem_alloc((char_u *)key);
    if (item == NULL)
	return FAIL;
    item->di_tv.v_lock = 0;
    if (str == NULL)
    {
	item->di_tv.v_type = VAR_NUMBER;
	item->di_tv.vval.v_number = nr;
    }
    else
    {
	item->di_tv.v_type = VAR_STRING;
	item->di_tv.vval.v_string = vim_strsave(str);
    }
    if (dict_add(d, item) == FAIL)
    {
	dictitem_free(item);
	return FAIL;
    }
    return OK;
}

/*
 * Add a list entry to dictionary "d".
 * Returns FAIL when out of memory and when key already exists.
 */
    int
dict_add_list(dict_T *d, char *key, list_T *list)
{
    dictitem_T	*item;

    item = dictitem_alloc((char_u *)key);
    if (item == NULL)
	return FAIL;
    item->di_tv.v_lock = 0;
    item->di_tv.v_type = VAR_LIST;
    item->di_tv.vval.v_list = list;
    if (dict_add(d, item) == FAIL)
    {
	dictitem_free(item);
	return FAIL;
    }
    ++list->lv_refcount;
    return OK;
}

/*
 * Get the number of items in a Dictionary.
 */
    static long
dict_len(dict_T *d)
{
    if (d == NULL)
	return 0L;
    return (long)d->dv_hashtab.ht_used;
}

/*
 * Find item "key[len]" in Dictionary "d".
 * If "len" is negative use strlen(key).
 * Returns NULL when not found.
 */
    dictitem_T *
dict_find(dict_T *d, char_u *key, int len)
{
#define AKEYLEN 200
    char_u	buf[AKEYLEN];
    char_u	*akey;
    char_u	*tofree = NULL;
    hashitem_T	*hi;

    if (len < 0)
	akey = key;
    else if (len >= AKEYLEN)
    {
	tofree = akey = vim_strnsave(key, len);
	if (akey == NULL)
	    return NULL;
    }
    else
    {
	/* Avoid a malloc/free by using buf[]. */
	vim_strncpy(buf, key, len);
	akey = buf;
    }

    hi = hash_find(&d->dv_hashtab, akey);
    vim_free(tofree);
    if (HASHITEM_EMPTY(hi))
	return NULL;
    return HI2DI(hi);
}

/*
 * Get a string item from a dictionary.
 * When "save" is TRUE allocate memory for it.
 * Returns NULL if the entry doesn't exist or out of memory.
 */
    char_u *
get_dict_string(dict_T *d, char_u *key, int save)
{
    dictitem_T	*di;
    char_u	*s;

    di = dict_find(d, key, -1);
    if (di == NULL)
	return NULL;
    s = get_tv_string(&di->di_tv);
    if (save && s != NULL)
	s = vim_strsave(s);
    return s;
}

/*
 * Get a number item from a dictionary.
 * Returns 0 if the entry doesn't exist or out of memory.
 */
    long
get_dict_number(dict_T *d, char_u *key)
{
    dictitem_T	*di;

    di = dict_find(d, key, -1);
    if (di == NULL)
	return 0;
    return get_tv_number(&di->di_tv);
}

/*
 * Return an allocated string with the string representation of a Dictionary.
 * May return NULL.
 */
    static char_u *
dict2string(typval_T *tv, int copyID)
{
    garray_T	ga;
    int		first = TRUE;
    char_u	*tofree;
    char_u	numbuf[NUMBUFLEN];
    hashitem_T	*hi;
    char_u	*s;
    dict_T	*d;
    int		todo;

    if ((d = tv->vval.v_dict) == NULL)
	return NULL;
    ga_init2(&ga, (int)sizeof(char), 80);
    ga_append(&ga, '{');

    todo = (int)d->dv_hashtab.ht_used;
    for (hi = d->dv_hashtab.ht_array; todo > 0 && !got_int; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;

	    if (first)
		first = FALSE;
	    else
		ga_concat(&ga, (char_u *)", ");

	    tofree = string_quote(hi->hi_key, FALSE);
	    if (tofree != NULL)
	    {
		ga_concat(&ga, tofree);
		vim_free(tofree);
	    }
	    ga_concat(&ga, (char_u *)": ");
	    s = tv2string(&HI2DI(hi)->di_tv, &tofree, numbuf, copyID);
	    if (s != NULL)
		ga_concat(&ga, s);
	    vim_free(tofree);
	    if (s == NULL || did_echo_string_emsg)
		break;
	    line_breakcheck();

	}
    }
    if (todo > 0)
    {
	vim_free(ga.ga_data);
	return NULL;
    }

    ga_append(&ga, '}');
    ga_append(&ga, NUL);
    return (char_u *)ga.ga_data;
}

/*
 * Allocate a variable for a Dictionary and fill it from "*arg".
 * Return OK or FAIL.  Returns NOTDONE for {expr}.
 */
    static int
get_dict_tv(char_u **arg, typval_T *rettv, int evaluate)
{
    dict_T	*d = NULL;
    typval_T	tvkey;
    typval_T	tv;
    char_u	*key = NULL;
    dictitem_T	*item;
    char_u	*start = skipwhite(*arg + 1);
    char_u	buf[NUMBUFLEN];

    /*
     * First check if it's not a curly-braces thing: {expr}.
     * Must do this without evaluating, otherwise a function may be called
     * twice.  Unfortunately this means we need to call eval1() twice for the
     * first item.
     * But {} is an empty Dictionary.
     */
    if (*start != '}')
    {
	if (eval1(&start, &tv, FALSE) == FAIL)	/* recursive! */
	    return FAIL;
	if (*start == '}')
	    return NOTDONE;
    }

    if (evaluate)
    {
	d = dict_alloc();
	if (d == NULL)
	    return FAIL;
    }
    tvkey.v_type = VAR_UNKNOWN;
    tv.v_type = VAR_UNKNOWN;

    *arg = skipwhite(*arg + 1);
    while (**arg != '}' && **arg != NUL)
    {
	if (eval1(arg, &tvkey, evaluate) == FAIL)	/* recursive! */
	    goto failret;
	if (**arg != ':')
	{
	    EMSG2(_("E720: Missing colon in Dictionary: %s"), *arg);
	    clear_tv(&tvkey);
	    goto failret;
	}
	if (evaluate)
	{
	    key = get_tv_string_buf_chk(&tvkey, buf);
	    if (key == NULL || *key == NUL)
	    {
		/* "key" is NULL when get_tv_string_buf_chk() gave an errmsg */
		if (key != NULL)
		    EMSG(_(e_emptykey));
		clear_tv(&tvkey);
		goto failret;
	    }
	}

	*arg = skipwhite(*arg + 1);
	if (eval1(arg, &tv, evaluate) == FAIL)	/* recursive! */
	{
	    if (evaluate)
		clear_tv(&tvkey);
	    goto failret;
	}
	if (evaluate)
	{
	    item = dict_find(d, key, -1);
	    if (item != NULL)
	    {
		EMSG2(_("E721: Duplicate key in Dictionary: \"%s\""), key);
		clear_tv(&tvkey);
		clear_tv(&tv);
		goto failret;
	    }
	    item = dictitem_alloc(key);
	    clear_tv(&tvkey);
	    if (item != NULL)
	    {
		item->di_tv = tv;
		item->di_tv.v_lock = 0;
		if (dict_add(d, item) == FAIL)
		    dictitem_free(item);
	    }
	}

	if (**arg == '}')
	    break;
	if (**arg != ',')
	{
	    EMSG2(_("E722: Missing comma in Dictionary: %s"), *arg);
	    goto failret;
	}
	*arg = skipwhite(*arg + 1);
    }

    if (**arg != '}')
    {
	EMSG2(_("E723: Missing end of Dictionary '}': %s"), *arg);
failret:
	if (evaluate)
	    dict_free(d, TRUE);
	return FAIL;
    }

    *arg = skipwhite(*arg + 1);
    if (evaluate)
    {
	rettv->v_type = VAR_DICT;
	rettv->vval.v_dict = d;
	++d->dv_refcount;
    }

    return OK;
}

    static char *
get_var_special_name(int nr)
{
    switch (nr)
    {
	case VVAL_FALSE: return "v:false";
	case VVAL_TRUE: return "v:true";
	case VVAL_NONE: return "v:none";
	case VVAL_NULL: return "v:null";
    }
    EMSG2(_(e_intern2), "get_var_special_name()");
    return "42";
}

/*
 * Return a string with the string representation of a variable.
 * If the memory is allocated "tofree" is set to it, otherwise NULL.
 * "numbuf" is used for a number.
 * Does not put quotes around strings, as ":echo" displays values.
 * When "copyID" is not NULL replace recursive lists and dicts with "...".
 * May return NULL.
 */
    static char_u *
echo_string(
    typval_T	*tv,
    char_u	**tofree,
    char_u	*numbuf,
    int		copyID)
{
    static int	recurse = 0;
    char_u	*r = NULL;

    if (recurse >= DICT_MAXNEST)
    {
	if (!did_echo_string_emsg)
	{
	    /* Only give this message once for a recursive call to avoid
	     * flooding the user with errors.  And stop iterating over lists
	     * and dicts. */
	    did_echo_string_emsg = TRUE;
	    EMSG(_("E724: variable nested too deep for displaying"));
	}
	*tofree = NULL;
	return (char_u *)"{E724}";
    }
    ++recurse;

    switch (tv->v_type)
    {
	case VAR_FUNC:
	    *tofree = NULL;
	    r = tv->vval.v_string;
	    break;

	case VAR_LIST:
	    if (tv->vval.v_list == NULL)
	    {
		*tofree = NULL;
		r = NULL;
	    }
	    else if (copyID != 0 && tv->vval.v_list->lv_copyID == copyID)
	    {
		*tofree = NULL;
		r = (char_u *)"[...]";
	    }
	    else
	    {
		tv->vval.v_list->lv_copyID = copyID;
		*tofree = list2string(tv, copyID);
		r = *tofree;
	    }
	    break;

	case VAR_DICT:
	    if (tv->vval.v_dict == NULL)
	    {
		*tofree = NULL;
		r = NULL;
	    }
	    else if (copyID != 0 && tv->vval.v_dict->dv_copyID == copyID)
	    {
		*tofree = NULL;
		r = (char_u *)"{...}";
	    }
	    else
	    {
		tv->vval.v_dict->dv_copyID = copyID;
		*tofree = dict2string(tv, copyID);
		r = *tofree;
	    }
	    break;

	case VAR_STRING:
	case VAR_NUMBER:
	case VAR_UNKNOWN:
	    *tofree = NULL;
	    r = get_tv_string_buf(tv, numbuf);
	    break;

#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    *tofree = NULL;
	    vim_snprintf((char *)numbuf, NUMBUFLEN, "%g", tv->vval.v_float);
	    r = numbuf;
	    break;
#endif

	case VAR_SPECIAL:
	    *tofree = NULL;
	    r = (char_u *)get_var_special_name(tv->vval.v_number);
	    break;
    }

    if (--recurse == 0)
	did_echo_string_emsg = FALSE;
    return r;
}

/*
 * Return a string with the string representation of a variable.
 * If the memory is allocated "tofree" is set to it, otherwise NULL.
 * "numbuf" is used for a number.
 * Puts quotes around strings, so that they can be parsed back by eval().
 * May return NULL.
 */
    static char_u *
tv2string(
    typval_T	*tv,
    char_u	**tofree,
    char_u	*numbuf,
    int		copyID)
{
    switch (tv->v_type)
    {
	case VAR_FUNC:
	    *tofree = string_quote(tv->vval.v_string, TRUE);
	    return *tofree;
	case VAR_STRING:
	    *tofree = string_quote(tv->vval.v_string, FALSE);
	    return *tofree;
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    *tofree = NULL;
	    vim_snprintf((char *)numbuf, NUMBUFLEN - 1, "%g", tv->vval.v_float);
	    return numbuf;
#endif
	case VAR_NUMBER:
	case VAR_LIST:
	case VAR_DICT:
	case VAR_SPECIAL:
	case VAR_UNKNOWN:
	    break;
    }
    return echo_string(tv, tofree, numbuf, copyID);
}

/*
 * Return string "str" in ' quotes, doubling ' characters.
 * If "str" is NULL an empty string is assumed.
 * If "function" is TRUE make it function('string').
 */
    static char_u *
string_quote(char_u *str, int function)
{
    unsigned	len;
    char_u	*p, *r, *s;

    len = (function ? 13 : 3);
    if (str != NULL)
    {
	len += (unsigned)STRLEN(str);
	for (p = str; *p != NUL; mb_ptr_adv(p))
	    if (*p == '\'')
		++len;
    }
    s = r = alloc(len);
    if (r != NULL)
    {
	if (function)
	{
	    STRCPY(r, "function('");
	    r += 10;
	}
	else
	    *r++ = '\'';
	if (str != NULL)
	    for (p = str; *p != NUL; )
	    {
		if (*p == '\'')
		    *r++ = '\'';
		MB_COPY_CHAR(p, r);
	    }
	*r++ = '\'';
	if (function)
	    *r++ = ')';
	*r++ = NUL;
    }
    return s;
}

#if defined(FEAT_FLOAT) || defined(PROTO)
/*
 * Convert the string "text" to a floating point number.
 * This uses strtod().  setlocale(LC_NUMERIC, "C") has been used to make sure
 * this always uses a decimal point.
 * Returns the length of the text that was consumed.
 */
    int
string2float(
    char_u	*text,
    float_T	*value)	    /* result stored here */
{
    char	*s = (char *)text;
    float_T	f;

    f = strtod(s, &s);
    *value = f;
    return (int)((char_u *)s - text);
}
#endif

/*
 * Get the value of an environment variable.
 * "arg" is pointing to the '$'.  It is advanced to after the name.
 * If the environment variable was not set, silently assume it is empty.
 * Return FAIL if the name is invalid.
 */
    static int
get_env_tv(char_u **arg, typval_T *rettv, int evaluate)
{
    char_u	*string = NULL;
    int		len;
    int		cc;
    char_u	*name;
    int		mustfree = FALSE;

    ++*arg;
    name = *arg;
    len = get_env_len(arg);
    if (evaluate)
    {
	if (len == 0)
	    return FAIL; /* invalid empty name */

	cc = name[len];
	name[len] = NUL;
	/* first try vim_getenv(), fast for normal environment vars */
	string = vim_getenv(name, &mustfree);
	if (string != NULL && *string != NUL)
	{
	    if (!mustfree)
		string = vim_strsave(string);
	}
	else
	{
	    if (mustfree)
		vim_free(string);

	    /* next try expanding things like $VIM and ${HOME} */
	    string = expand_env_save(name - 1);
	    if (string != NULL && *string == '$')
	    {
		vim_free(string);
		string = NULL;
	    }
	}
	name[len] = cc;

	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = string;
    }

    return OK;
}

/*
 * Array with names and number of arguments of all internal functions
 * MUST BE KEPT SORTED IN strcmp() ORDER FOR BINARY SEARCH!
 */
static struct fst
{
    char	*f_name;	/* function name */
    char	f_min_argc;	/* minimal number of arguments */
    char	f_max_argc;	/* maximal number of arguments */
    void	(*f_func)(typval_T *args, typval_T *rvar);
				/* implementation of function */
} functions[] =
{
#ifdef FEAT_FLOAT
    {"abs",		1, 1, f_abs},
    {"acos",		1, 1, f_acos},	/* WJMc */
#endif
    {"add",		2, 2, f_add},
    {"alloc_fail",	3, 3, f_alloc_fail},
    {"and",		2, 2, f_and},
    {"append",		2, 2, f_append},
    {"argc",		0, 0, f_argc},
    {"argidx",		0, 0, f_argidx},
    {"arglistid",	0, 2, f_arglistid},
    {"argv",		0, 1, f_argv},
#ifdef FEAT_FLOAT
    {"asin",		1, 1, f_asin},	/* WJMc */
#endif
    {"assert_equal",	2, 3, f_assert_equal},
    {"assert_exception", 1, 2, f_assert_exception},
    {"assert_fails",	1, 2, f_assert_fails},
    {"assert_false",	1, 2, f_assert_false},
    {"assert_true",	1, 2, f_assert_true},
#ifdef FEAT_FLOAT
    {"atan",		1, 1, f_atan},
    {"atan2",		2, 2, f_atan2},
#endif
    {"browse",		4, 4, f_browse},
    {"browsedir",	2, 2, f_browsedir},
    {"bufexists",	1, 1, f_bufexists},
    {"buffer_exists",	1, 1, f_bufexists},	/* obsolete */
    {"buffer_name",	1, 1, f_bufname},	/* obsolete */
    {"buffer_number",	1, 1, f_bufnr},		/* obsolete */
    {"buflisted",	1, 1, f_buflisted},
    {"bufloaded",	1, 1, f_bufloaded},
    {"bufname",		1, 1, f_bufname},
    {"bufnr",		1, 2, f_bufnr},
    {"bufwinnr",	1, 1, f_bufwinnr},
    {"byte2line",	1, 1, f_byte2line},
    {"byteidx",		2, 2, f_byteidx},
    {"byteidxcomp",	2, 2, f_byteidxcomp},
    {"call",		2, 3, f_call},
#ifdef FEAT_FLOAT
    {"ceil",		1, 1, f_ceil},
#endif
#ifdef FEAT_CHANNEL
    {"ch_close",	1, 1, f_ch_close},
    {"ch_open",		1, 2, f_ch_open},
    {"ch_sendexpr",	2, 3, f_ch_sendexpr},
    {"ch_sendraw",	2, 3, f_ch_sendraw},
#endif
    {"changenr",	0, 0, f_changenr},
    {"char2nr",		1, 2, f_char2nr},
    {"cindent",		1, 1, f_cindent},
    {"clearmatches",	0, 0, f_clearmatches},
    {"col",		1, 1, f_col},
#if defined(FEAT_INS_EXPAND)
    {"complete",	2, 2, f_complete},
    {"complete_add",	1, 1, f_complete_add},
    {"complete_check",	0, 0, f_complete_check},
#endif
    {"confirm",		1, 4, f_confirm},
    {"copy",		1, 1, f_copy},
#ifdef FEAT_FLOAT
    {"cos",		1, 1, f_cos},
    {"cosh",		1, 1, f_cosh},
#endif
    {"count",		2, 4, f_count},
    {"cscope_connection",0,3, f_cscope_connection},
    {"cursor",		1, 3, f_cursor},
    {"deepcopy",	1, 2, f_deepcopy},
    {"delete",		1, 2, f_delete},
    {"did_filetype",	0, 0, f_did_filetype},
    {"diff_filler",	1, 1, f_diff_filler},
    {"diff_hlID",	2, 2, f_diff_hlID},
    {"empty",		1, 1, f_empty},
    {"escape",		2, 2, f_escape},
    {"eval",		1, 1, f_eval},
    {"eventhandler",	0, 0, f_eventhandler},
    {"executable",	1, 1, f_executable},
    {"exepath",		1, 1, f_exepath},
    {"exists",		1, 1, f_exists},
#ifdef FEAT_FLOAT
    {"exp",		1, 1, f_exp},
#endif
    {"expand",		1, 3, f_expand},
    {"extend",		2, 3, f_extend},
    {"feedkeys",	1, 2, f_feedkeys},
    {"file_readable",	1, 1, f_filereadable},	/* obsolete */
    {"filereadable",	1, 1, f_filereadable},
    {"filewritable",	1, 1, f_filewritable},
    {"filter",		2, 2, f_filter},
    {"finddir",		1, 3, f_finddir},
    {"findfile",	1, 3, f_findfile},
#ifdef FEAT_FLOAT
    {"float2nr",	1, 1, f_float2nr},
    {"floor",		1, 1, f_floor},
    {"fmod",		2, 2, f_fmod},
#endif
    {"fnameescape",	1, 1, f_fnameescape},
    {"fnamemodify",	2, 2, f_fnamemodify},
    {"foldclosed",	1, 1, f_foldclosed},
    {"foldclosedend",	1, 1, f_foldclosedend},
    {"foldlevel",	1, 1, f_foldlevel},
    {"foldtext",	0, 0, f_foldtext},
    {"foldtextresult",	1, 1, f_foldtextresult},
    {"foreground",	0, 0, f_foreground},
    {"function",	1, 1, f_function},
    {"garbagecollect",	0, 1, f_garbagecollect},
    {"get",		2, 3, f_get},
    {"getbufline",	2, 3, f_getbufline},
    {"getbufvar",	2, 3, f_getbufvar},
    {"getchar",		0, 1, f_getchar},
    {"getcharmod",	0, 0, f_getcharmod},
    {"getcharsearch",	0, 0, f_getcharsearch},
    {"getcmdline",	0, 0, f_getcmdline},
    {"getcmdpos",	0, 0, f_getcmdpos},
    {"getcmdtype",	0, 0, f_getcmdtype},
    {"getcmdwintype",	0, 0, f_getcmdwintype},
    {"getcurpos",	0, 0, f_getcurpos},
    {"getcwd",		0, 2, f_getcwd},
    {"getfontname",	0, 1, f_getfontname},
    {"getfperm",	1, 1, f_getfperm},
    {"getfsize",	1, 1, f_getfsize},
    {"getftime",	1, 1, f_getftime},
    {"getftype",	1, 1, f_getftype},
    {"getline",		1, 2, f_getline},
    {"getloclist",	1, 1, f_getqflist},
    {"getmatches",	0, 0, f_getmatches},
    {"getpid",		0, 0, f_getpid},
    {"getpos",		1, 1, f_getpos},
    {"getqflist",	0, 0, f_getqflist},
    {"getreg",		0, 3, f_getreg},
    {"getregtype",	0, 1, f_getregtype},
    {"gettabvar",	2, 3, f_gettabvar},
    {"gettabwinvar",	3, 4, f_gettabwinvar},
    {"getwinposx",	0, 0, f_getwinposx},
    {"getwinposy",	0, 0, f_getwinposy},
    {"getwinvar",	2, 3, f_getwinvar},
    {"glob",		1, 4, f_glob},
    {"glob2regpat",	1, 1, f_glob2regpat},
    {"globpath",	2, 5, f_globpath},
    {"has",		1, 1, f_has},
    {"has_key",		2, 2, f_has_key},
    {"haslocaldir",	0, 2, f_haslocaldir},
    {"hasmapto",	1, 3, f_hasmapto},
    {"highlightID",	1, 1, f_hlID},		/* obsolete */
    {"highlight_exists",1, 1, f_hlexists},	/* obsolete */
    {"histadd",		2, 2, f_histadd},
    {"histdel",		1, 2, f_histdel},
    {"histget",		1, 2, f_histget},
    {"histnr",		1, 1, f_histnr},
    {"hlID",		1, 1, f_hlID},
    {"hlexists",	1, 1, f_hlexists},
    {"hostname",	0, 0, f_hostname},
    {"iconv",		3, 3, f_iconv},
    {"indent",		1, 1, f_indent},
    {"index",		2, 4, f_index},
    {"input",		1, 3, f_input},
    {"inputdialog",	1, 3, f_inputdialog},
    {"inputlist",	1, 1, f_inputlist},
    {"inputrestore",	0, 0, f_inputrestore},
    {"inputsave",	0, 0, f_inputsave},
    {"inputsecret",	1, 2, f_inputsecret},
    {"insert",		2, 3, f_insert},
    {"invert",		1, 1, f_invert},
    {"isdirectory",	1, 1, f_isdirectory},
    {"islocked",	1, 1, f_islocked},
    {"items",		1, 1, f_items},
    {"join",		1, 2, f_join},
    {"jsondecode",	1, 1, f_jsondecode},
    {"jsonencode",	1, 1, f_jsonencode},
    {"keys",		1, 1, f_keys},
    {"last_buffer_nr",	0, 0, f_last_buffer_nr},/* obsolete */
    {"len",		1, 1, f_len},
    {"libcall",		3, 3, f_libcall},
    {"libcallnr",	3, 3, f_libcallnr},
    {"line",		1, 1, f_line},
    {"line2byte",	1, 1, f_line2byte},
    {"lispindent",	1, 1, f_lispindent},
    {"localtime",	0, 0, f_localtime},
#ifdef FEAT_FLOAT
    {"log",		1, 1, f_log},
    {"log10",		1, 1, f_log10},
#endif
#ifdef FEAT_LUA
    {"luaeval",		1, 2, f_luaeval},
#endif
    {"map",		2, 2, f_map},
    {"maparg",		1, 4, f_maparg},
    {"mapcheck",	1, 3, f_mapcheck},
    {"match",		2, 4, f_match},
    {"matchadd",	2, 5, f_matchadd},
    {"matchaddpos",	2, 5, f_matchaddpos},
    {"matcharg",	1, 1, f_matcharg},
    {"matchdelete",	1, 1, f_matchdelete},
    {"matchend",	2, 4, f_matchend},
    {"matchlist",	2, 4, f_matchlist},
    {"matchstr",	2, 4, f_matchstr},
    {"max",		1, 1, f_max},
    {"min",		1, 1, f_min},
#ifdef vim_mkdir
    {"mkdir",		1, 3, f_mkdir},
#endif
    {"mode",		0, 1, f_mode},
#ifdef FEAT_MZSCHEME
    {"mzeval",		1, 1, f_mzeval},
#endif
    {"nextnonblank",	1, 1, f_nextnonblank},
    {"nr2char",		1, 2, f_nr2char},
    {"or",		2, 2, f_or},
    {"pathshorten",	1, 1, f_pathshorten},
#ifdef FEAT_PERL
    {"perleval",	1, 1, f_perleval},
#endif
#ifdef FEAT_FLOAT
    {"pow",		2, 2, f_pow},
#endif
    {"prevnonblank",	1, 1, f_prevnonblank},
    {"printf",		2, 19, f_printf},
    {"pumvisible",	0, 0, f_pumvisible},
#ifdef FEAT_PYTHON3
    {"py3eval",		1, 1, f_py3eval},
#endif
#ifdef FEAT_PYTHON
    {"pyeval",		1, 1, f_pyeval},
#endif
    {"range",		1, 3, f_range},
    {"readfile",	1, 3, f_readfile},
    {"reltime",		0, 2, f_reltime},
    {"reltimestr",	1, 1, f_reltimestr},
    {"remote_expr",	2, 3, f_remote_expr},
    {"remote_foreground", 1, 1, f_remote_foreground},
    {"remote_peek",	1, 2, f_remote_peek},
    {"remote_read",	1, 1, f_remote_read},
    {"remote_send",	2, 3, f_remote_send},
    {"remove",		2, 3, f_remove},
    {"rename",		2, 2, f_rename},
    {"repeat",		2, 2, f_repeat},
    {"resolve",		1, 1, f_resolve},
    {"reverse",		1, 1, f_reverse},
#ifdef FEAT_FLOAT
    {"round",		1, 1, f_round},
#endif
    {"screenattr",	2, 2, f_screenattr},
    {"screenchar",	2, 2, f_screenchar},
    {"screencol",	0, 0, f_screencol},
    {"screenrow",	0, 0, f_screenrow},
    {"search",		1, 4, f_search},
    {"searchdecl",	1, 3, f_searchdecl},
    {"searchpair",	3, 7, f_searchpair},
    {"searchpairpos",	3, 7, f_searchpairpos},
    {"searchpos",	1, 4, f_searchpos},
    {"server2client",	2, 2, f_server2client},
    {"serverlist",	0, 0, f_serverlist},
    {"setbufvar",	3, 3, f_setbufvar},
    {"setcharsearch",	1, 1, f_setcharsearch},
    {"setcmdpos",	1, 1, f_setcmdpos},
    {"setline",		2, 2, f_setline},
    {"setloclist",	2, 3, f_setloclist},
    {"setmatches",	1, 1, f_setmatches},
    {"setpos",		2, 2, f_setpos},
    {"setqflist",	1, 2, f_setqflist},
    {"setreg",		2, 3, f_setreg},
    {"settabvar",	3, 3, f_settabvar},
    {"settabwinvar",	4, 4, f_settabwinvar},
    {"setwinvar",	3, 3, f_setwinvar},
#ifdef FEAT_CRYPT
    {"sha256",		1, 1, f_sha256},
#endif
    {"shellescape",	1, 2, f_shellescape},
    {"shiftwidth",	0, 0, f_shiftwidth},
    {"simplify",	1, 1, f_simplify},
#ifdef FEAT_FLOAT
    {"sin",		1, 1, f_sin},
    {"sinh",		1, 1, f_sinh},
#endif
    {"sort",		1, 3, f_sort},
    {"soundfold",	1, 1, f_soundfold},
    {"spellbadword",	0, 1, f_spellbadword},
    {"spellsuggest",	1, 3, f_spellsuggest},
    {"split",		1, 3, f_split},
#ifdef FEAT_FLOAT
    {"sqrt",		1, 1, f_sqrt},
    {"str2float",	1, 1, f_str2float},
#endif
    {"str2nr",		1, 2, f_str2nr},
    {"strchars",	1, 2, f_strchars},
    {"strdisplaywidth",	1, 2, f_strdisplaywidth},
#ifdef HAVE_STRFTIME
    {"strftime",	1, 2, f_strftime},
#endif
    {"stridx",		2, 3, f_stridx},
    {"string",		1, 1, f_string},
    {"strlen",		1, 1, f_strlen},
    {"strpart",		2, 3, f_strpart},
    {"strridx",		2, 3, f_strridx},
    {"strtrans",	1, 1, f_strtrans},
    {"strwidth",	1, 1, f_strwidth},
    {"submatch",	1, 2, f_submatch},
    {"substitute",	4, 4, f_substitute},
    {"synID",		3, 3, f_synID},
    {"synIDattr",	2, 3, f_synIDattr},
    {"synIDtrans",	1, 1, f_synIDtrans},
    {"synconcealed",	2, 2, f_synconcealed},
    {"synstack",	2, 2, f_synstack},
    {"system",		1, 2, f_system},
    {"systemlist",	1, 2, f_systemlist},
    {"tabpagebuflist",	0, 1, f_tabpagebuflist},
    {"tabpagenr",	0, 1, f_tabpagenr},
    {"tabpagewinnr",	1, 2, f_tabpagewinnr},
    {"tagfiles",	0, 0, f_tagfiles},
    {"taglist",		1, 1, f_taglist},
#ifdef FEAT_FLOAT
    {"tan",		1, 1, f_tan},
    {"tanh",		1, 1, f_tanh},
#endif
    {"tempname",	0, 0, f_tempname},
    {"test",		1, 1, f_test},
    {"tolower",		1, 1, f_tolower},
    {"toupper",		1, 1, f_toupper},
    {"tr",		3, 3, f_tr},
#ifdef FEAT_FLOAT
    {"trunc",		1, 1, f_trunc},
#endif
    {"type",		1, 1, f_type},
    {"undofile",	1, 1, f_undofile},
    {"undotree",	0, 0, f_undotree},
    {"uniq",		1, 3, f_uniq},
    {"values",		1, 1, f_values},
    {"virtcol",		1, 1, f_virtcol},
    {"visualmode",	0, 1, f_visualmode},
    {"wildmenumode",	0, 0, f_wildmenumode},
    {"winbufnr",	1, 1, f_winbufnr},
    {"wincol",		0, 0, f_wincol},
    {"winheight",	1, 1, f_winheight},
    {"winline",		0, 0, f_winline},
    {"winnr",		0, 1, f_winnr},
    {"winrestcmd",	0, 0, f_winrestcmd},
    {"winrestview",	1, 1, f_winrestview},
    {"winsaveview",	0, 0, f_winsaveview},
    {"winwidth",	1, 1, f_winwidth},
    {"wordcount",	0, 0, f_wordcount},
    {"writefile",	2, 3, f_writefile},
    {"xor",		2, 2, f_xor},
};

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)

/*
 * Function given to ExpandGeneric() to obtain the list of internal
 * or user defined function names.
 */
    char_u *
get_function_name(expand_T *xp, int idx)
{
    static int	intidx = -1;
    char_u	*name;

    if (idx == 0)
	intidx = -1;
    if (intidx < 0)
    {
	name = get_user_func_name(xp, idx);
	if (name != NULL)
	    return name;
    }
    if (++intidx < (int)(sizeof(functions) / sizeof(struct fst)))
    {
	STRCPY(IObuff, functions[intidx].f_name);
	STRCAT(IObuff, "(");
	if (functions[intidx].f_max_argc == 0)
	    STRCAT(IObuff, ")");
	return IObuff;
    }

    return NULL;
}

/*
 * Function given to ExpandGeneric() to obtain the list of internal or
 * user defined variable or function names.
 */
    char_u *
get_expr_name(expand_T *xp, int idx)
{
    static int	intidx = -1;
    char_u	*name;

    if (idx == 0)
	intidx = -1;
    if (intidx < 0)
    {
	name = get_function_name(xp, idx);
	if (name != NULL)
	    return name;
    }
    return get_user_var_name(xp, ++intidx);
}

#endif /* FEAT_CMDL_COMPL */

#if defined(EBCDIC) || defined(PROTO)
/*
 * Compare struct fst by function name.
 */
    static int
compare_func_name(const void *s1, const void *s2)
{
    struct fst *p1 = (struct fst *)s1;
    struct fst *p2 = (struct fst *)s2;

    return STRCMP(p1->f_name, p2->f_name);
}

/*
 * Sort the function table by function name.
 * The sorting of the table above is ASCII dependant.
 * On machines using EBCDIC we have to sort it.
 */
    static void
sortFunctions(void)
{
    int		funcCnt = (int)(sizeof(functions) / sizeof(struct fst)) - 1;

    qsort(functions, (size_t)funcCnt, sizeof(struct fst), compare_func_name);
}
#endif


/*
 * Find internal function in table above.
 * Return index, or -1 if not found
 */
    static int
find_internal_func(
    char_u	*name)		/* name of the function */
{
    int		first = 0;
    int		last = (int)(sizeof(functions) / sizeof(struct fst)) - 1;
    int		cmp;
    int		x;

    /*
     * Find the function name in the table. Binary search.
     */
    while (first <= last)
    {
	x = first + ((unsigned)(last - first) >> 1);
	cmp = STRCMP(name, functions[x].f_name);
	if (cmp < 0)
	    last = x - 1;
	else if (cmp > 0)
	    first = x + 1;
	else
	    return x;
    }
    return -1;
}

/*
 * Check if "name" is a variable of type VAR_FUNC.  If so, return the function
 * name it contains, otherwise return "name".
 */
    static char_u *
deref_func_name(char_u *name, int *lenp, int no_autoload)
{
    dictitem_T	*v;
    int		cc;

    cc = name[*lenp];
    name[*lenp] = NUL;
    v = find_var(name, NULL, no_autoload);
    name[*lenp] = cc;
    if (v != NULL && v->di_tv.v_type == VAR_FUNC)
    {
	if (v->di_tv.vval.v_string == NULL)
	{
	    *lenp = 0;
	    return (char_u *)"";	/* just in case */
	}
	*lenp = (int)STRLEN(v->di_tv.vval.v_string);
	return v->di_tv.vval.v_string;
    }

    return name;
}

/*
 * Allocate a variable for the result of a function.
 * Return OK or FAIL.
 */
    static int
get_func_tv(
    char_u	*name,		/* name of the function */
    int		len,		/* length of "name" */
    typval_T	*rettv,
    char_u	**arg,		/* argument, pointing to the '(' */
    linenr_T	firstline,	/* first line of range */
    linenr_T	lastline,	/* last line of range */
    int		*doesrange,	/* return: function handled range */
    int		evaluate,
    dict_T	*selfdict)	/* Dictionary for "self" */
{
    char_u	*argp;
    int		ret = OK;
    typval_T	argvars[MAX_FUNC_ARGS + 1];	/* vars for arguments */
    int		argcount = 0;		/* number of arguments found */

    /*
     * Get the arguments.
     */
    argp = *arg;
    while (argcount < MAX_FUNC_ARGS)
    {
	argp = skipwhite(argp + 1);	    /* skip the '(' or ',' */
	if (*argp == ')' || *argp == ',' || *argp == NUL)
	    break;
	if (eval1(&argp, &argvars[argcount], evaluate) == FAIL)
	{
	    ret = FAIL;
	    break;
	}
	++argcount;
	if (*argp != ',')
	    break;
    }
    if (*argp == ')')
	++argp;
    else
	ret = FAIL;

    if (ret == OK)
	ret = call_func(name, len, rettv, argcount, argvars,
			  firstline, lastline, doesrange, evaluate, selfdict);
    else if (!aborting())
    {
	if (argcount == MAX_FUNC_ARGS)
	    emsg_funcname(N_("E740: Too many arguments for function %s"), name);
	else
	    emsg_funcname(N_("E116: Invalid arguments for function %s"), name);
    }

    while (--argcount >= 0)
	clear_tv(&argvars[argcount]);

    *arg = skipwhite(argp);
    return ret;
}


/*
 * Call a function with its resolved parameters
 * Return FAIL when the function can't be called,  OK otherwise.
 * Also returns OK when an error was encountered while executing the function.
 */
    int
call_func(
    char_u	*funcname,	/* name of the function */
    int		len,		/* length of "name" */
    typval_T	*rettv,		/* return value goes here */
    int		argcount,	/* number of "argvars" */
    typval_T	*argvars,	/* vars for arguments, must have "argcount"
				   PLUS ONE elements! */
    linenr_T	firstline,	/* first line of range */
    linenr_T	lastline,	/* last line of range */
    int		*doesrange,	/* return: function handled range */
    int		evaluate,
    dict_T	*selfdict)	/* Dictionary for "self" */
{
    int		ret = FAIL;
#define ERROR_UNKNOWN	0
#define ERROR_TOOMANY	1
#define ERROR_TOOFEW	2
#define ERROR_SCRIPT	3
#define ERROR_DICT	4
#define ERROR_NONE	5
#define ERROR_OTHER	6
    int		error = ERROR_NONE;
    int		i;
    int		llen;
    ufunc_T	*fp;
#define FLEN_FIXED 40
    char_u	fname_buf[FLEN_FIXED + 1];
    char_u	*fname;
    char_u	*name;

    /* Make a copy of the name, if it comes from a funcref variable it could
     * be changed or deleted in the called function. */
    name = vim_strnsave(funcname, len);
    if (name == NULL)
	return ret;

    /*
     * In a script change <SID>name() and s:name() to K_SNR 123_name().
     * Change <SNR>123_name() to K_SNR 123_name().
     * Use fname_buf[] when it fits, otherwise allocate memory (slow).
     */
    llen = eval_fname_script(name);
    if (llen > 0)
    {
	fname_buf[0] = K_SPECIAL;
	fname_buf[1] = KS_EXTRA;
	fname_buf[2] = (int)KE_SNR;
	i = 3;
	if (eval_fname_sid(name))	/* "<SID>" or "s:" */
	{
	    if (current_SID <= 0)
		error = ERROR_SCRIPT;
	    else
	    {
		sprintf((char *)fname_buf + 3, "%ld_", (long)current_SID);
		i = (int)STRLEN(fname_buf);
	    }
	}
	if (i + STRLEN(name + llen) < FLEN_FIXED)
	{
	    STRCPY(fname_buf + i, name + llen);
	    fname = fname_buf;
	}
	else
	{
	    fname = alloc((unsigned)(i + STRLEN(name + llen) + 1));
	    if (fname == NULL)
		error = ERROR_OTHER;
	    else
	    {
		mch_memmove(fname, fname_buf, (size_t)i);
		STRCPY(fname + i, name + llen);
	    }
	}
    }
    else
	fname = name;

    *doesrange = FALSE;


    /* execute the function if no errors detected and executing */
    if (evaluate && error == ERROR_NONE)
    {
	char_u *rfname = fname;

	/* Ignore "g:" before a function name. */
	if (fname[0] == 'g' && fname[1] == ':')
	    rfname = fname + 2;

	rettv->v_type = VAR_NUMBER;	/* default rettv is number zero */
	rettv->vval.v_number = 0;
	error = ERROR_UNKNOWN;

	if (!builtin_function(rfname, -1))
	{
	    /*
	     * User defined function.
	     */
	    fp = find_func(rfname);

#ifdef FEAT_AUTOCMD
	    /* Trigger FuncUndefined event, may load the function. */
	    if (fp == NULL
		    && apply_autocmds(EVENT_FUNCUNDEFINED,
						     rfname, rfname, TRUE, NULL)
		    && !aborting())
	    {
		/* executed an autocommand, search for the function again */
		fp = find_func(rfname);
	    }
#endif
	    /* Try loading a package. */
	    if (fp == NULL && script_autoload(rfname, TRUE) && !aborting())
	    {
		/* loaded a package, search for the function again */
		fp = find_func(rfname);
	    }

	    if (fp != NULL)
	    {
		if (fp->uf_flags & FC_RANGE)
		    *doesrange = TRUE;
		if (argcount < fp->uf_args.ga_len)
		    error = ERROR_TOOFEW;
		else if (!fp->uf_varargs && argcount > fp->uf_args.ga_len)
		    error = ERROR_TOOMANY;
		else if ((fp->uf_flags & FC_DICT) && selfdict == NULL)
		    error = ERROR_DICT;
		else
		{
		    int did_save_redo = FALSE;

		    /*
		     * Call the user function.
		     * Save and restore search patterns, script variables and
		     * redo buffer.
		     */
		    save_search_patterns();
#ifdef FEAT_INS_EXPAND
		    if (!ins_compl_active())
#endif
		    {
			saveRedobuff();
			did_save_redo = TRUE;
		    }
		    ++fp->uf_calls;
		    call_user_func(fp, argcount, argvars, rettv,
					       firstline, lastline,
				  (fp->uf_flags & FC_DICT) ? selfdict : NULL);
		    if (--fp->uf_calls <= 0 && isdigit(*fp->uf_name)
						      && fp->uf_refcount <= 0)
			/* Function was unreferenced while being used, free it
			 * now. */
			func_free(fp);
		    if (did_save_redo)
			restoreRedobuff();
		    restore_search_patterns();
		    error = ERROR_NONE;
		}
	    }
	}
	else
	{
	    /*
	     * Find the function name in the table, call its implementation.
	     */
	    i = find_internal_func(fname);
	    if (i >= 0)
	    {
		if (argcount < functions[i].f_min_argc)
		    error = ERROR_TOOFEW;
		else if (argcount > functions[i].f_max_argc)
		    error = ERROR_TOOMANY;
		else
		{
		    argvars[argcount].v_type = VAR_UNKNOWN;
		    functions[i].f_func(argvars, rettv);
		    error = ERROR_NONE;
		}
	    }
	}
	/*
	 * The function call (or "FuncUndefined" autocommand sequence) might
	 * have been aborted by an error, an interrupt, or an explicitly thrown
	 * exception that has not been caught so far.  This situation can be
	 * tested for by calling aborting().  For an error in an internal
	 * function or for the "E132" error in call_user_func(), however, the
	 * throw point at which the "force_abort" flag (temporarily reset by
	 * emsg()) is normally updated has not been reached yet. We need to
	 * update that flag first to make aborting() reliable.
	 */
	update_force_abort();
    }
    if (error == ERROR_NONE)
	ret = OK;

    /*
     * Report an error unless the argument evaluation or function call has been
     * cancelled due to an aborting error, an interrupt, or an exception.
     */
    if (!aborting())
    {
	switch (error)
	{
	    case ERROR_UNKNOWN:
		    emsg_funcname(N_("E117: Unknown function: %s"), name);
		    break;
	    case ERROR_TOOMANY:
		    emsg_funcname(e_toomanyarg, name);
		    break;
	    case ERROR_TOOFEW:
		    emsg_funcname(N_("E119: Not enough arguments for function: %s"),
									name);
		    break;
	    case ERROR_SCRIPT:
		    emsg_funcname(N_("E120: Using <SID> not in a script context: %s"),
									name);
		    break;
	    case ERROR_DICT:
		    emsg_funcname(N_("E725: Calling dict function without Dictionary: %s"),
									name);
		    break;
	}
    }

    if (fname != name && fname != fname_buf)
	vim_free(fname);
    vim_free(name);

    return ret;
}

/*
 * Give an error message with a function name.  Handle <SNR> things.
 * "ermsg" is to be passed without translation, use N_() instead of _().
 */
    static void
emsg_funcname(char *ermsg, char_u *name)
{
    char_u	*p;

    if (*name == K_SPECIAL)
	p = concat_str((char_u *)"<SNR>", name + 3);
    else
	p = name;
    EMSG2(_(ermsg), p);
    if (p != name)
	vim_free(p);
}

/*
 * Return TRUE for a non-zero Number and a non-empty String.
 */
    static int
non_zero_arg(typval_T *argvars)
{
    return ((argvars[0].v_type == VAR_NUMBER
		&& argvars[0].vval.v_number != 0)
	    || (argvars[0].v_type == VAR_STRING
		&& argvars[0].vval.v_string != NULL
		&& *argvars[0].vval.v_string != NUL));
}

/*********************************************
 * Implementation of the built-in functions
 */

#ifdef FEAT_FLOAT
static int get_float_arg(typval_T *argvars, float_T *f);

/*
 * Get the float value of "argvars[0]" into "f".
 * Returns FAIL when the argument is not a Number or Float.
 */
    static int
get_float_arg(typval_T *argvars, float_T *f)
{
    if (argvars[0].v_type == VAR_FLOAT)
    {
	*f = argvars[0].vval.v_float;
	return OK;
    }
    if (argvars[0].v_type == VAR_NUMBER)
    {
	*f = (float_T)argvars[0].vval.v_number;
	return OK;
    }
    EMSG(_("E808: Number or Float required"));
    return FAIL;
}

/*
 * "abs(expr)" function
 */
    static void
f_abs(typval_T *argvars, typval_T *rettv)
{
    if (argvars[0].v_type == VAR_FLOAT)
    {
	rettv->v_type = VAR_FLOAT;
	rettv->vval.v_float = fabs(argvars[0].vval.v_float);
    }
    else
    {
	varnumber_T	n;
	int		error = FALSE;

	n = get_tv_number_chk(&argvars[0], &error);
	if (error)
	    rettv->vval.v_number = -1;
	else if (n > 0)
	    rettv->vval.v_number = n;
	else
	    rettv->vval.v_number = -n;
    }
}

/*
 * "acos()" function
 */
    static void
f_acos(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = acos(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "add(list, item)" function
 */
    static void
f_add(typval_T *argvars, typval_T *rettv)
{
    list_T	*l;

    rettv->vval.v_number = 1; /* Default: Failed */
    if (argvars[0].v_type == VAR_LIST)
    {
	if ((l = argvars[0].vval.v_list) != NULL
		&& !tv_check_lock(l->lv_lock,
					 (char_u *)N_("add() argument"), TRUE)
		&& list_append_tv(l, &argvars[1]) == OK)
	    copy_tv(&argvars[0], rettv);
    }
    else
	EMSG(_(e_listreq));
}

/*
 * "alloc_fail(id, countdown, repeat)" function
 */
    static void
f_alloc_fail(typval_T *argvars, typval_T *rettv UNUSED)
{
    if (argvars[0].v_type != VAR_NUMBER
	    || argvars[0].vval.v_number <= 0
	    || argvars[1].v_type != VAR_NUMBER
	    || argvars[1].vval.v_number < 0
	    || argvars[2].v_type != VAR_NUMBER)
	EMSG(_(e_invarg));
    else
    {
	alloc_fail_id = argvars[0].vval.v_number;
	if (alloc_fail_id >= aid_last)
	    EMSG(_(e_invarg));
	alloc_fail_countdown = argvars[1].vval.v_number;
	alloc_fail_repeat = argvars[2].vval.v_number;
	did_outofmem_msg = FALSE;
    }
}

/*
 * "and(expr, expr)" function
 */
    static void
f_and(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = get_tv_number_chk(&argvars[0], NULL)
					& get_tv_number_chk(&argvars[1], NULL);
}

/*
 * "append(lnum, string/list)" function
 */
    static void
f_append(typval_T *argvars, typval_T *rettv)
{
    long	lnum;
    char_u	*line;
    list_T	*l = NULL;
    listitem_T	*li = NULL;
    typval_T	*tv;
    long	added = 0;

    /* When coming here from Insert mode, sync undo, so that this can be
     * undone separately from what was previously inserted. */
    if (u_sync_once == 2)
    {
	u_sync_once = 1; /* notify that u_sync() was called */
	u_sync(TRUE);
    }

    lnum = get_tv_lnum(argvars);
    if (lnum >= 0
	    && lnum <= curbuf->b_ml.ml_line_count
	    && u_save(lnum, lnum + 1) == OK)
    {
	if (argvars[1].v_type == VAR_LIST)
	{
	    l = argvars[1].vval.v_list;
	    if (l == NULL)
		return;
	    li = l->lv_first;
	}
	for (;;)
	{
	    if (l == NULL)
		tv = &argvars[1];	/* append a string */
	    else if (li == NULL)
		break;			/* end of list */
	    else
		tv = &li->li_tv;	/* append item from list */
	    line = get_tv_string_chk(tv);
	    if (line == NULL)		/* type error */
	    {
		rettv->vval.v_number = 1;	/* Failed */
		break;
	    }
	    ml_append(lnum + added, line, (colnr_T)0, FALSE);
	    ++added;
	    if (l == NULL)
		break;
	    li = li->li_next;
	}

	appended_lines_mark(lnum, added);
	if (curwin->w_cursor.lnum > lnum)
	    curwin->w_cursor.lnum += added;
    }
    else
	rettv->vval.v_number = 1;	/* Failed */
}

/*
 * "argc()" function
 */
    static void
f_argc(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = ARGCOUNT;
}

/*
 * "argidx()" function
 */
    static void
f_argidx(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = curwin->w_arg_idx;
}

/*
 * "arglistid()" function
 */
    static void
f_arglistid(typval_T *argvars UNUSED, typval_T *rettv)
{
    win_T	*wp;

    rettv->vval.v_number = -1;
    wp = find_tabwin(&argvars[0], &argvars[1]);
    if (wp != NULL)
	rettv->vval.v_number = wp->w_alist->id;
}

/*
 * "argv(nr)" function
 */
    static void
f_argv(typval_T *argvars, typval_T *rettv)
{
    int		idx;

    if (argvars[0].v_type != VAR_UNKNOWN)
    {
	idx = get_tv_number_chk(&argvars[0], NULL);
	if (idx >= 0 && idx < ARGCOUNT)
	    rettv->vval.v_string = vim_strsave(alist_name(&ARGLIST[idx]));
	else
	    rettv->vval.v_string = NULL;
	rettv->v_type = VAR_STRING;
    }
    else if (rettv_list_alloc(rettv) == OK)
	for (idx = 0; idx < ARGCOUNT; ++idx)
	    list_append_string(rettv->vval.v_list,
					       alist_name(&ARGLIST[idx]), -1);
}

static void prepare_assert_error(garray_T*gap);
static void fill_assert_error(garray_T *gap, typval_T *opt_msg_tv, char_u *exp_str, typval_T *exp_tv, typval_T *got_tv);
static void assert_error(garray_T *gap);
static void assert_bool(typval_T *argvars, int isTrue);

/*
 * Prepare "gap" for an assert error and add the sourcing position.
 */
    static void
prepare_assert_error(garray_T *gap)
{
    char buf[NUMBUFLEN];

    ga_init2(gap, 1, 100);
    if (sourcing_name != NULL)
    {
	ga_concat(gap, sourcing_name);
	if (sourcing_lnum > 0)
	    ga_concat(gap, (char_u *)" ");
    }
    if (sourcing_lnum > 0)
    {
	sprintf(buf, "line %ld", (long)sourcing_lnum);
	ga_concat(gap, (char_u *)buf);
    }
    if (sourcing_name != NULL || sourcing_lnum > 0)
	ga_concat(gap, (char_u *)": ");
}

/*
 * Fill "gap" with information about an assert error.
 */
    static void
fill_assert_error(
    garray_T	*gap,
    typval_T	*opt_msg_tv,
    char_u      *exp_str,
    typval_T	*exp_tv,
    typval_T	*got_tv)
{
    char_u	numbuf[NUMBUFLEN];
    char_u	*tofree;

    if (opt_msg_tv->v_type != VAR_UNKNOWN)
    {
	ga_concat(gap, tv2string(opt_msg_tv, &tofree, numbuf, 0));
	vim_free(tofree);
    }
    else
    {
	ga_concat(gap, (char_u *)"Expected ");
	if (exp_str == NULL)
	{
	    ga_concat(gap, tv2string(exp_tv, &tofree, numbuf, 0));
	    vim_free(tofree);
	}
	else
	    ga_concat(gap, exp_str);
	ga_concat(gap, (char_u *)" but got ");
	ga_concat(gap, tv2string(got_tv, &tofree, numbuf, 0));
	vim_free(tofree);
    }
}

/*
 * Add an assert error to v:errors.
 */
    static void
assert_error(garray_T *gap)
{
    struct vimvar   *vp = &vimvars[VV_ERRORS];

    if (vp->vv_type != VAR_LIST || vimvars[VV_ERRORS].vv_list == NULL)
	/* Make sure v:errors is a list. */
	set_vim_var_list(VV_ERRORS, list_alloc());
    list_append_string(vimvars[VV_ERRORS].vv_list, gap->ga_data, gap->ga_len);
}

/*
 * "assert_equal(expected, actual[, msg])" function
 */
    static void
f_assert_equal(typval_T *argvars, typval_T *rettv UNUSED)
{
    garray_T	ga;

    if (!tv_equal(&argvars[0], &argvars[1], FALSE, FALSE))
    {
	prepare_assert_error(&ga);
	fill_assert_error(&ga, &argvars[2], NULL, &argvars[0], &argvars[1]);
	assert_error(&ga);
	ga_clear(&ga);
    }
}

/*
 * "assert_exception(string[, msg])" function
 */
    static void
f_assert_exception(typval_T *argvars, typval_T *rettv UNUSED)
{
    garray_T	ga;
    char	*error;

    error = (char *)get_tv_string_chk(&argvars[0]);
    if (vimvars[VV_EXCEPTION].vv_str == NULL)
    {
	prepare_assert_error(&ga);
	ga_concat(&ga, (char_u *)"v:exception is not set");
	assert_error(&ga);
	ga_clear(&ga);
    }
    else if (error != NULL
	    && strstr((char *)vimvars[VV_EXCEPTION].vv_str, error) == NULL)
    {
	prepare_assert_error(&ga);
	fill_assert_error(&ga, &argvars[1], NULL, &argvars[0],
						&vimvars[VV_EXCEPTION].vv_tv);
	assert_error(&ga);
	ga_clear(&ga);
    }
}

/*
 * "assert_fails(cmd [, error])" function
 */
    static void
f_assert_fails(typval_T *argvars, typval_T *rettv UNUSED)
{
    char_u	*cmd = get_tv_string_chk(&argvars[0]);
    garray_T	ga;

    called_emsg = FALSE;
    suppress_errthrow = TRUE;
    emsg_silent = TRUE;
    do_cmdline_cmd(cmd);
    if (!called_emsg)
    {
	prepare_assert_error(&ga);
	ga_concat(&ga, (char_u *)"command did not fail: ");
	ga_concat(&ga, cmd);
	assert_error(&ga);
	ga_clear(&ga);
    }
    else if (argvars[1].v_type != VAR_UNKNOWN)
    {
	char_u	buf[NUMBUFLEN];
	char	*error = (char *)get_tv_string_buf_chk(&argvars[1], buf);

	if (strstr((char *)vimvars[VV_ERRMSG].vv_str, error) == NULL)
	{
	    prepare_assert_error(&ga);
	    fill_assert_error(&ga, &argvars[2], NULL, &argvars[1],
						&vimvars[VV_ERRMSG].vv_tv);
	    assert_error(&ga);
	    ga_clear(&ga);
	}
    }

    called_emsg = FALSE;
    suppress_errthrow = FALSE;
    emsg_silent = FALSE;
    emsg_on_display = FALSE;
    set_vim_var_string(VV_ERRMSG, NULL, 0);
}

/*
 * Common for assert_true() and assert_false().
 */
    static void
assert_bool(typval_T *argvars, int isTrue)
{
    int		error = FALSE;
    garray_T	ga;

    if (argvars[0].v_type == VAR_SPECIAL
	    && argvars[0].vval.v_number == (isTrue ? VVAL_TRUE : VV_FALSE))
	return;
    if (argvars[0].v_type != VAR_NUMBER
	    || (get_tv_number_chk(&argvars[0], &error) == 0) == isTrue
	    || error)
    {
	prepare_assert_error(&ga);
	fill_assert_error(&ga, &argvars[1],
		(char_u *)(isTrue ? "True" : "False"),
		NULL, &argvars[0]);
	assert_error(&ga);
	ga_clear(&ga);
    }
}

/*
 * "assert_false(actual[, msg])" function
 */
    static void
f_assert_false(typval_T *argvars, typval_T *rettv UNUSED)
{
    assert_bool(argvars, FALSE);
}

/*
 * "assert_true(actual[, msg])" function
 */
    static void
f_assert_true(typval_T *argvars, typval_T *rettv UNUSED)
{
    assert_bool(argvars, TRUE);
}

#ifdef FEAT_FLOAT
/*
 * "asin()" function
 */
    static void
f_asin(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = asin(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "atan()" function
 */
    static void
f_atan(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = atan(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "atan2()" function
 */
    static void
f_atan2(typval_T *argvars, typval_T *rettv)
{
    float_T	fx, fy;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &fx) == OK
				     && get_float_arg(&argvars[1], &fy) == OK)
	rettv->vval.v_float = atan2(fx, fy);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "browse(save, title, initdir, default)" function
 */
    static void
f_browse(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_BROWSE
    int		save;
    char_u	*title;
    char_u	*initdir;
    char_u	*defname;
    char_u	buf[NUMBUFLEN];
    char_u	buf2[NUMBUFLEN];
    int		error = FALSE;

    save = get_tv_number_chk(&argvars[0], &error);
    title = get_tv_string_chk(&argvars[1]);
    initdir = get_tv_string_buf_chk(&argvars[2], buf);
    defname = get_tv_string_buf_chk(&argvars[3], buf2);

    if (error || title == NULL || initdir == NULL || defname == NULL)
	rettv->vval.v_string = NULL;
    else
	rettv->vval.v_string =
		 do_browse(save ? BROWSE_SAVE : 0,
				 title, defname, NULL, initdir, NULL, curbuf);
#else
    rettv->vval.v_string = NULL;
#endif
    rettv->v_type = VAR_STRING;
}

/*
 * "browsedir(title, initdir)" function
 */
    static void
f_browsedir(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_BROWSE
    char_u	*title;
    char_u	*initdir;
    char_u	buf[NUMBUFLEN];

    title = get_tv_string_chk(&argvars[0]);
    initdir = get_tv_string_buf_chk(&argvars[1], buf);

    if (title == NULL || initdir == NULL)
	rettv->vval.v_string = NULL;
    else
	rettv->vval.v_string = do_browse(BROWSE_DIR,
				    title, NULL, NULL, initdir, NULL, curbuf);
#else
    rettv->vval.v_string = NULL;
#endif
    rettv->v_type = VAR_STRING;
}

static buf_T *find_buffer(typval_T *avar);

/*
 * Find a buffer by number or exact name.
 */
    static buf_T *
find_buffer(typval_T *avar)
{
    buf_T	*buf = NULL;

    if (avar->v_type == VAR_NUMBER)
	buf = buflist_findnr((int)avar->vval.v_number);
    else if (avar->v_type == VAR_STRING && avar->vval.v_string != NULL)
    {
	buf = buflist_findname_exp(avar->vval.v_string);
	if (buf == NULL)
	{
	    /* No full path name match, try a match with a URL or a "nofile"
	     * buffer, these don't use the full path. */
	    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
		if (buf->b_fname != NULL
			&& (path_with_url(buf->b_fname)
#ifdef FEAT_QUICKFIX
			    || bt_nofile(buf)
#endif
			   )
			&& STRCMP(buf->b_fname, avar->vval.v_string) == 0)
		    break;
	}
    }
    return buf;
}

/*
 * "bufexists(expr)" function
 */
    static void
f_bufexists(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = (find_buffer(&argvars[0]) != NULL);
}

/*
 * "buflisted(expr)" function
 */
    static void
f_buflisted(typval_T *argvars, typval_T *rettv)
{
    buf_T	*buf;

    buf = find_buffer(&argvars[0]);
    rettv->vval.v_number = (buf != NULL && buf->b_p_bl);
}

/*
 * "bufloaded(expr)" function
 */
    static void
f_bufloaded(typval_T *argvars, typval_T *rettv)
{
    buf_T	*buf;

    buf = find_buffer(&argvars[0]);
    rettv->vval.v_number = (buf != NULL && buf->b_ml.ml_mfp != NULL);
}

static buf_T *get_buf_tv(typval_T *tv, int curtab_only);

/*
 * Get buffer by number or pattern.
 */
    static buf_T *
get_buf_tv(typval_T *tv, int curtab_only)
{
    char_u	*name = tv->vval.v_string;
    int		save_magic;
    char_u	*save_cpo;
    buf_T	*buf;

    if (tv->v_type == VAR_NUMBER)
	return buflist_findnr((int)tv->vval.v_number);
    if (tv->v_type != VAR_STRING)
	return NULL;
    if (name == NULL || *name == NUL)
	return curbuf;
    if (name[0] == '$' && name[1] == NUL)
	return lastbuf;

    /* Ignore 'magic' and 'cpoptions' here to make scripts portable */
    save_magic = p_magic;
    p_magic = TRUE;
    save_cpo = p_cpo;
    p_cpo = (char_u *)"";

    buf = buflist_findnr(buflist_findpat(name, name + STRLEN(name),
						    TRUE, FALSE, curtab_only));

    p_magic = save_magic;
    p_cpo = save_cpo;

    /* If not found, try expanding the name, like done for bufexists(). */
    if (buf == NULL)
	buf = find_buffer(tv);

    return buf;
}

/*
 * "bufname(expr)" function
 */
    static void
f_bufname(typval_T *argvars, typval_T *rettv)
{
    buf_T	*buf;

    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    ++emsg_off;
    buf = get_buf_tv(&argvars[0], FALSE);
    rettv->v_type = VAR_STRING;
    if (buf != NULL && buf->b_fname != NULL)
	rettv->vval.v_string = vim_strsave(buf->b_fname);
    else
	rettv->vval.v_string = NULL;
    --emsg_off;
}

/*
 * "bufnr(expr)" function
 */
    static void
f_bufnr(typval_T *argvars, typval_T *rettv)
{
    buf_T	*buf;
    int		error = FALSE;
    char_u	*name;

    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    ++emsg_off;
    buf = get_buf_tv(&argvars[0], FALSE);
    --emsg_off;

    /* If the buffer isn't found and the second argument is not zero create a
     * new buffer. */
    if (buf == NULL
	    && argvars[1].v_type != VAR_UNKNOWN
	    && get_tv_number_chk(&argvars[1], &error) != 0
	    && !error
	    && (name = get_tv_string_chk(&argvars[0])) != NULL
	    && !error)
	buf = buflist_new(name, NULL, (linenr_T)1, 0);

    if (buf != NULL)
	rettv->vval.v_number = buf->b_fnum;
    else
	rettv->vval.v_number = -1;
}

/*
 * "bufwinnr(nr)" function
 */
    static void
f_bufwinnr(typval_T *argvars, typval_T *rettv)
{
#ifdef FEAT_WINDOWS
    win_T	*wp;
    int		winnr = 0;
#endif
    buf_T	*buf;

    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    ++emsg_off;
    buf = get_buf_tv(&argvars[0], TRUE);
#ifdef FEAT_WINDOWS
    for (wp = firstwin; wp; wp = wp->w_next)
    {
	++winnr;
	if (wp->w_buffer == buf)
	    break;
    }
    rettv->vval.v_number = (wp != NULL ? winnr : -1);
#else
    rettv->vval.v_number = (curwin->w_buffer == buf ? 1 : -1);
#endif
    --emsg_off;
}

/*
 * "byte2line(byte)" function
 */
    static void
f_byte2line(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifndef FEAT_BYTEOFF
    rettv->vval.v_number = -1;
#else
    long	boff = 0;

    boff = get_tv_number(&argvars[0]) - 1;  /* boff gets -1 on type error */
    if (boff < 0)
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = ml_find_line_or_offset(curbuf,
							  (linenr_T)0, &boff);
#endif
}

    static void
byteidx(typval_T *argvars, typval_T *rettv, int comp UNUSED)
{
#ifdef FEAT_MBYTE
    char_u	*t;
#endif
    char_u	*str;
    long	idx;

    str = get_tv_string_chk(&argvars[0]);
    idx = get_tv_number_chk(&argvars[1], NULL);
    rettv->vval.v_number = -1;
    if (str == NULL || idx < 0)
	return;

#ifdef FEAT_MBYTE
    t = str;
    for ( ; idx > 0; idx--)
    {
	if (*t == NUL)		/* EOL reached */
	    return;
	if (enc_utf8 && comp)
	    t += utf_ptr2len(t);
	else
	    t += (*mb_ptr2len)(t);
    }
    rettv->vval.v_number = (varnumber_T)(t - str);
#else
    if ((size_t)idx <= STRLEN(str))
	rettv->vval.v_number = idx;
#endif
}

/*
 * "byteidx()" function
 */
    static void
f_byteidx(typval_T *argvars, typval_T *rettv)
{
    byteidx(argvars, rettv, FALSE);
}

/*
 * "byteidxcomp()" function
 */
    static void
f_byteidxcomp(typval_T *argvars, typval_T *rettv)
{
    byteidx(argvars, rettv, TRUE);
}

    int
func_call(
    char_u	*name,
    typval_T	*args,
    dict_T	*selfdict,
    typval_T	*rettv)
{
    listitem_T	*item;
    typval_T	argv[MAX_FUNC_ARGS + 1];
    int		argc = 0;
    int		dummy;
    int		r = 0;

    for (item = args->vval.v_list->lv_first; item != NULL;
							 item = item->li_next)
    {
	if (argc == MAX_FUNC_ARGS)
	{
	    EMSG(_("E699: Too many arguments"));
	    break;
	}
	/* Make a copy of each argument.  This is needed to be able to set
	 * v_lock to VAR_FIXED in the copy without changing the original list.
	 */
	copy_tv(&item->li_tv, &argv[argc++]);
    }

    if (item == NULL)
	r = call_func(name, (int)STRLEN(name), rettv, argc, argv,
				 curwin->w_cursor.lnum, curwin->w_cursor.lnum,
						      &dummy, TRUE, selfdict);

    /* Free the arguments. */
    while (argc > 0)
	clear_tv(&argv[--argc]);

    return r;
}

/*
 * "call(func, arglist)" function
 */
    static void
f_call(typval_T *argvars, typval_T *rettv)
{
    char_u	*func;
    dict_T	*selfdict = NULL;

    if (argvars[1].v_type != VAR_LIST)
    {
	EMSG(_(e_listreq));
	return;
    }
    if (argvars[1].vval.v_list == NULL)
	return;

    if (argvars[0].v_type == VAR_FUNC)
	func = argvars[0].vval.v_string;
    else
	func = get_tv_string(&argvars[0]);
    if (*func == NUL)
	return;		/* type error or empty name */

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	if (argvars[2].v_type != VAR_DICT)
	{
	    EMSG(_(e_dictreq));
	    return;
	}
	selfdict = argvars[2].vval.v_dict;
    }

    (void)func_call(func, &argvars[1], selfdict, rettv);
}

#ifdef FEAT_FLOAT
/*
 * "ceil({float})" function
 */
    static void
f_ceil(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = ceil(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

#ifdef FEAT_CHANNEL
/*
 * Get the channel index from the handle argument.
 * Returns -1 if the handle is invalid or the channel is closed.
 */
    static int
get_channel_arg(typval_T *tv)
{
    int ch_idx;

    if (tv->v_type != VAR_NUMBER)
    {
	EMSG2(_(e_invarg2), get_tv_string(tv));
	return -1;
    }
    ch_idx = tv->vval.v_number;

    if (!channel_is_open(ch_idx))
    {
	EMSGN(_("E906: not an open channel"), ch_idx);
	return -1;
    }
    return ch_idx;
}

/*
 * "ch_close()" function
 */
    static void
f_ch_close(typval_T *argvars, typval_T *rettv UNUSED)
{
    int ch_idx = get_channel_arg(&argvars[0]);

    if (ch_idx >= 0)
	channel_close(ch_idx);
}

/*
 * Get a callback from "arg".  It can be a Funcref or a function name.
 * When "arg" is zero return an empty string.
 * Return NULL for an invalid argument.
 */
    static char_u *
get_callback(typval_T *arg)
{
    if (arg->v_type == VAR_FUNC || arg->v_type == VAR_STRING)
	return arg->vval.v_string;
    if (arg->v_type == VAR_NUMBER && arg->vval.v_number == 0)
	return (char_u *)"";
    EMSG(_("E999: Invalid callback argument"));
    return NULL;
}

/*
 * "ch_open()" function
 */
    static void
f_ch_open(typval_T *argvars, typval_T *rettv)
{
    char_u	*address;
    char_u	*mode;
    char_u	*callback = NULL;
    char_u	*p;
    char	*rest;
    int		port;
    int		waittime = 0;
    int		timeout = 2000;
    int		json_mode = TRUE;
    int		ch_idx;

    /* default: fail */
    rettv->vval.v_number = -1;

    address = get_tv_string(&argvars[0]);
    if (argvars[1].v_type != VAR_UNKNOWN
	 && (argvars[1].v_type != VAR_DICT || argvars[1].vval.v_dict == NULL))
    {
	EMSG(_(e_invarg));
	return;
    }

    /* parse address */
    p = vim_strchr(address, ':');
    if (p == NULL)
    {
	EMSG2(_(e_invarg2), address);
	return;
    }
    *p++ = NUL;
    port = strtol((char *)p, &rest, 10);
    if (*address == NUL || port <= 0 || *rest != NUL)
    {
	p[-1] = ':';
	EMSG2(_(e_invarg2), address);
	return;
    }

    if (argvars[1].v_type == VAR_DICT)
    {
	/* parse argdict */
	dict_T	*dict = argvars[1].vval.v_dict;

	if (dict_find(dict, (char_u *)"mode", -1) != NULL)
	{
	    mode = get_dict_string(dict, (char_u *)"mode", FALSE);
	    if (STRCMP(mode, "raw") == 0)
		json_mode = FALSE;
	    else if (STRCMP(mode, "json") != 0)
	    {
		EMSG2(_(e_invarg2), mode);
		return;
	    }
	}
	if (dict_find(dict, (char_u *)"waittime", -1) != NULL)
	    waittime = get_dict_number(dict, (char_u *)"waittime");
	if (dict_find(dict, (char_u *)"timeout", -1) != NULL)
	    timeout = get_dict_number(dict, (char_u *)"timeout");
	if (dict_find(dict, (char_u *)"callback", -1) != NULL)
	    callback = get_dict_string(dict, (char_u *)"callback", FALSE);
    }
    if (waittime < 0 || timeout < 0)
    {
	EMSG(_(e_invarg));
	return;
    }

    ch_idx = channel_open((char *)address, port, waittime, NULL);
    if (ch_idx >= 0)
    {
	channel_set_json_mode(ch_idx, json_mode);
	channel_set_timeout(ch_idx, timeout);
	if (callback != NULL && *callback != NUL)
	    channel_set_callback(ch_idx, callback);
    }
    rettv->vval.v_number = ch_idx;
}

/*
 * common for "sendexpr()" and "sendraw()"
 * Returns the channel index if the caller should read the response.
 * Otherwise returns -1.
 */
    static int
send_common(typval_T *argvars, char_u *text, int id, char *fun)
{
    int		ch_idx;
    char_u	*callback = NULL;

    ch_idx = get_channel_arg(&argvars[0]);
    if (ch_idx < 0)
	return -1;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	callback = get_callback(&argvars[2]);
	if (callback == NULL)
	    return -1;
    }
    /* Set the callback. An empty callback means no callback and not reading
     * the response. */
    if (callback != NULL && *callback != NUL)
	channel_set_req_callback(ch_idx, callback, id);

    if (channel_send(ch_idx, text, fun) == OK && callback == NULL)
	return ch_idx;
    return -1;
}

/*
 * "ch_sendexpr()" function
 */
    static void
f_ch_sendexpr(typval_T *argvars, typval_T *rettv)
{
    char_u	*text;
    typval_T	*listtv;
    int		ch_idx;
    int		id;

    /* return an empty string by default */
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    id = channel_get_id();
    text = json_encode_nr_expr(id, &argvars[1]);
    if (text == NULL)
	return;

    ch_idx = send_common(argvars, text, id, "sendexpr");
    vim_free(text);
    if (ch_idx >= 0)
    {
	if (channel_read_json_block(ch_idx, id, &listtv) == OK)
	{
	    list_T *list = listtv->vval.v_list;

	    /* Move the item from the list and then change the type to
	     * avoid the value being freed. */
	    *rettv = list->lv_last->li_tv;
	    list->lv_last->li_tv.v_type = VAR_NUMBER;
	    clear_tv(listtv);
	}
    }
}

/*
 * "ch_sendraw()" function
 */
    static void
f_ch_sendraw(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];
    char_u	*text;
    int		ch_idx;

    /* return an empty string by default */
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    text = get_tv_string_buf(&argvars[1], buf);
    ch_idx = send_common(argvars, text, 0, "sendraw");
    if (ch_idx >= 0)
	rettv->vval.v_string = channel_read_block(ch_idx);
}
#endif

/*
 * "changenr()" function
 */
    static void
f_changenr(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = curbuf->b_u_seq_cur;
}

/*
 * "char2nr(string)" function
 */
    static void
f_char2nr(typval_T *argvars, typval_T *rettv)
{
#ifdef FEAT_MBYTE
    if (has_mbyte)
    {
	int	utf8 = 0;

	if (argvars[1].v_type != VAR_UNKNOWN)
	    utf8 = get_tv_number_chk(&argvars[1], NULL);

	if (utf8)
	    rettv->vval.v_number = (*utf_ptr2char)(get_tv_string(&argvars[0]));
	else
	    rettv->vval.v_number = (*mb_ptr2char)(get_tv_string(&argvars[0]));
    }
    else
#endif
    rettv->vval.v_number = get_tv_string(&argvars[0])[0];
}

/*
 * "cindent(lnum)" function
 */
    static void
f_cindent(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CINDENT
    pos_T	pos;
    linenr_T	lnum;

    pos = curwin->w_cursor;
    lnum = get_tv_lnum(argvars);
    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
    {
	curwin->w_cursor.lnum = lnum;
	rettv->vval.v_number = get_c_indent();
	curwin->w_cursor = pos;
    }
    else
#endif
	rettv->vval.v_number = -1;
}

/*
 * "clearmatches()" function
 */
    static void
f_clearmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    clear_matches(curwin);
#endif
}

/*
 * "col(string)" function
 */
    static void
f_col(typval_T *argvars, typval_T *rettv)
{
    colnr_T	col = 0;
    pos_T	*fp;
    int		fnum = curbuf->b_fnum;

    fp = var2fpos(&argvars[0], FALSE, &fnum);
    if (fp != NULL && fnum == curbuf->b_fnum)
    {
	if (fp->col == MAXCOL)
	{
	    /* '> can be MAXCOL, get the length of the line then */
	    if (fp->lnum <= curbuf->b_ml.ml_line_count)
		col = (colnr_T)STRLEN(ml_get(fp->lnum)) + 1;
	    else
		col = MAXCOL;
	}
	else
	{
	    col = fp->col + 1;
#ifdef FEAT_VIRTUALEDIT
	    /* col(".") when the cursor is on the NUL at the end of the line
	     * because of "coladd" can be seen as an extra column. */
	    if (virtual_active() && fp == &curwin->w_cursor)
	    {
		char_u	*p = ml_get_cursor();

		if (curwin->w_cursor.coladd >= (colnr_T)chartabsize(p,
				 curwin->w_virtcol - curwin->w_cursor.coladd))
		{
# ifdef FEAT_MBYTE
		    int		l;

		    if (*p != NUL && p[(l = (*mb_ptr2len)(p))] == NUL)
			col += l;
# else
		    if (*p != NUL && p[1] == NUL)
			++col;
# endif
		}
	    }
#endif
	}
    }
    rettv->vval.v_number = col;
}

#if defined(FEAT_INS_EXPAND)
/*
 * "complete()" function
 */
    static void
f_complete(typval_T *argvars, typval_T *rettv UNUSED)
{
    int	    startcol;

    if ((State & INSERT) == 0)
    {
	EMSG(_("E785: complete() can only be used in Insert mode"));
	return;
    }

    /* Check for undo allowed here, because if something was already inserted
     * the line was already saved for undo and this check isn't done. */
    if (!undo_allowed())
	return;

    if (argvars[1].v_type != VAR_LIST || argvars[1].vval.v_list == NULL)
    {
	EMSG(_(e_invarg));
	return;
    }

    startcol = get_tv_number_chk(&argvars[0], NULL);
    if (startcol <= 0)
	return;

    set_completion(startcol - 1, argvars[1].vval.v_list);
}

/*
 * "complete_add()" function
 */
    static void
f_complete_add(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = ins_compl_add_tv(&argvars[0], 0);
}

/*
 * "complete_check()" function
 */
    static void
f_complete_check(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		saved = RedrawingDisabled;

    RedrawingDisabled = 0;
    ins_compl_check_keys(0);
    rettv->vval.v_number = compl_interrupted;
    RedrawingDisabled = saved;
}
#endif

/*
 * "confirm(message, buttons[, default [, type]])" function
 */
    static void
f_confirm(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
    char_u	*message;
    char_u	*buttons = NULL;
    char_u	buf[NUMBUFLEN];
    char_u	buf2[NUMBUFLEN];
    int		def = 1;
    int		type = VIM_GENERIC;
    char_u	*typestr;
    int		error = FALSE;

    message = get_tv_string_chk(&argvars[0]);
    if (message == NULL)
	error = TRUE;
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	buttons = get_tv_string_buf_chk(&argvars[1], buf);
	if (buttons == NULL)
	    error = TRUE;
	if (argvars[2].v_type != VAR_UNKNOWN)
	{
	    def = get_tv_number_chk(&argvars[2], &error);
	    if (argvars[3].v_type != VAR_UNKNOWN)
	    {
		typestr = get_tv_string_buf_chk(&argvars[3], buf2);
		if (typestr == NULL)
		    error = TRUE;
		else
		{
		    switch (TOUPPER_ASC(*typestr))
		    {
			case 'E': type = VIM_ERROR; break;
			case 'Q': type = VIM_QUESTION; break;
			case 'I': type = VIM_INFO; break;
			case 'W': type = VIM_WARNING; break;
			case 'G': type = VIM_GENERIC; break;
		    }
		}
	    }
	}
    }

    if (buttons == NULL || *buttons == NUL)
	buttons = (char_u *)_("&Ok");

    if (!error)
	rettv->vval.v_number = do_dialog(type, NULL, message, buttons,
							    def, NULL, FALSE);
#endif
}

/*
 * "copy()" function
 */
    static void
f_copy(typval_T *argvars, typval_T *rettv)
{
    item_copy(&argvars[0], rettv, FALSE, 0);
}

#ifdef FEAT_FLOAT
/*
 * "cos()" function
 */
    static void
f_cos(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = cos(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "cosh()" function
 */
    static void
f_cosh(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = cosh(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "count()" function
 */
    static void
f_count(typval_T *argvars, typval_T *rettv)
{
    long	n = 0;
    int		ic = FALSE;

    if (argvars[0].v_type == VAR_LIST)
    {
	listitem_T	*li;
	list_T		*l;
	long		idx;

	if ((l = argvars[0].vval.v_list) != NULL)
	{
	    li = l->lv_first;
	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		int error = FALSE;

		ic = get_tv_number_chk(&argvars[2], &error);
		if (argvars[3].v_type != VAR_UNKNOWN)
		{
		    idx = get_tv_number_chk(&argvars[3], &error);
		    if (!error)
		    {
			li = list_find(l, idx);
			if (li == NULL)
			    EMSGN(_(e_listidx), idx);
		    }
		}
		if (error)
		    li = NULL;
	    }

	    for ( ; li != NULL; li = li->li_next)
		if (tv_equal(&li->li_tv, &argvars[1], ic, FALSE))
		    ++n;
	}
    }
    else if (argvars[0].v_type == VAR_DICT)
    {
	int		todo;
	dict_T		*d;
	hashitem_T	*hi;

	if ((d = argvars[0].vval.v_dict) != NULL)
	{
	    int error = FALSE;

	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		ic = get_tv_number_chk(&argvars[2], &error);
		if (argvars[3].v_type != VAR_UNKNOWN)
		    EMSG(_(e_invarg));
	    }

	    todo = error ? 0 : (int)d->dv_hashtab.ht_used;
	    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
	    {
		if (!HASHITEM_EMPTY(hi))
		{
		    --todo;
		    if (tv_equal(&HI2DI(hi)->di_tv, &argvars[1], ic, FALSE))
			++n;
		}
	    }
	}
    }
    else
	EMSG2(_(e_listdictarg), "count()");
    rettv->vval.v_number = n;
}

/*
 * "cscope_connection([{num} , {dbpath} [, {prepend}]])" function
 *
 * Checks the existence of a cscope connection.
 */
    static void
f_cscope_connection(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CSCOPE
    int		num = 0;
    char_u	*dbpath = NULL;
    char_u	*prepend = NULL;
    char_u	buf[NUMBUFLEN];

    if (argvars[0].v_type != VAR_UNKNOWN
	    && argvars[1].v_type != VAR_UNKNOWN)
    {
	num = (int)get_tv_number(&argvars[0]);
	dbpath = get_tv_string(&argvars[1]);
	if (argvars[2].v_type != VAR_UNKNOWN)
	    prepend = get_tv_string_buf(&argvars[2], buf);
    }

    rettv->vval.v_number = cs_connection(num, dbpath, prepend);
#endif
}

/*
 * "cursor(lnum, col)" function, or
 * "cursor(list)"
 *
 * Moves the cursor to the specified line and column.
 * Returns 0 when the position could be set, -1 otherwise.
 */
    static void
f_cursor(typval_T *argvars, typval_T *rettv)
{
    long	line, col;
#ifdef FEAT_VIRTUALEDIT
    long	coladd = 0;
#endif
    int		set_curswant = TRUE;

    rettv->vval.v_number = -1;
    if (argvars[1].v_type == VAR_UNKNOWN)
    {
	pos_T	    pos;
	colnr_T	    curswant = -1;

	if (list2fpos(argvars, &pos, NULL, &curswant) == FAIL)
	{
	    EMSG(_(e_invarg));
	    return;
	}
	line = pos.lnum;
	col = pos.col;
#ifdef FEAT_VIRTUALEDIT
	coladd = pos.coladd;
#endif
	if (curswant >= 0)
	{
	    curwin->w_curswant = curswant - 1;
	    set_curswant = FALSE;
	}
    }
    else
    {
	line = get_tv_lnum(argvars);
	col = get_tv_number_chk(&argvars[1], NULL);
#ifdef FEAT_VIRTUALEDIT
	if (argvars[2].v_type != VAR_UNKNOWN)
	    coladd = get_tv_number_chk(&argvars[2], NULL);
#endif
    }
    if (line < 0 || col < 0
#ifdef FEAT_VIRTUALEDIT
			    || coladd < 0
#endif
	    )
	return;		/* type error; errmsg already given */
    if (line > 0)
	curwin->w_cursor.lnum = line;
    if (col > 0)
	curwin->w_cursor.col = col - 1;
#ifdef FEAT_VIRTUALEDIT
    curwin->w_cursor.coladd = coladd;
#endif

    /* Make sure the cursor is in a valid position. */
    check_cursor();
#ifdef FEAT_MBYTE
    /* Correct cursor for multi-byte character. */
    if (has_mbyte)
	mb_adjust_cursor();
#endif

    curwin->w_set_curswant = set_curswant;
    rettv->vval.v_number = 0;
}

/*
 * "deepcopy()" function
 */
    static void
f_deepcopy(typval_T *argvars, typval_T *rettv)
{
    int		noref = 0;

    if (argvars[1].v_type != VAR_UNKNOWN)
	noref = get_tv_number_chk(&argvars[1], NULL);
    if (noref < 0 || noref > 1)
	EMSG(_(e_invarg));
    else
    {
	current_copyID += COPYID_INC;
	item_copy(&argvars[0], rettv, TRUE, noref == 0 ? current_copyID : 0);
    }
}

/*
 * "delete()" function
 */
    static void
f_delete(typval_T *argvars, typval_T *rettv)
{
    char_u	nbuf[NUMBUFLEN];
    char_u	*name;
    char_u	*flags;

    rettv->vval.v_number = -1;
    if (check_restricted() || check_secure())
	return;

    name = get_tv_string(&argvars[0]);
    if (name == NULL || *name == NUL)
    {
	EMSG(_(e_invarg));
	return;
    }

    if (argvars[1].v_type != VAR_UNKNOWN)
	flags = get_tv_string_buf(&argvars[1], nbuf);
    else
	flags = (char_u *)"";

    if (*flags == NUL)
	/* delete a file */
	rettv->vval.v_number = mch_remove(name) == 0 ? 0 : -1;
    else if (STRCMP(flags, "d") == 0)
	/* delete an empty directory */
	rettv->vval.v_number = mch_rmdir(name) == 0 ? 0 : -1;
    else if (STRCMP(flags, "rf") == 0)
	/* delete a directory recursively */
	rettv->vval.v_number = delete_recursive(name);
    else
	EMSG2(_(e_invexpr2), flags);
}

/*
 * "did_filetype()" function
 */
    static void
f_did_filetype(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_AUTOCMD
    rettv->vval.v_number = did_filetype;
#endif
}

/*
 * "diff_filler()" function
 */
    static void
f_diff_filler(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
    rettv->vval.v_number = diff_check_fill(curwin, get_tv_lnum(argvars));
#endif
}

/*
 * "diff_hlID()" function
 */
    static void
f_diff_hlID(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_DIFF
    linenr_T		lnum = get_tv_lnum(argvars);
    static linenr_T	prev_lnum = 0;
    static int		changedtick = 0;
    static int		fnum = 0;
    static int		change_start = 0;
    static int		change_end = 0;
    static hlf_T	hlID = (hlf_T)0;
    int			filler_lines;
    int			col;

    if (lnum < 0)	/* ignore type error in {lnum} arg */
	lnum = 0;
    if (lnum != prev_lnum
	    || changedtick != curbuf->b_changedtick
	    || fnum != curbuf->b_fnum)
    {
	/* New line, buffer, change: need to get the values. */
	filler_lines = diff_check(curwin, lnum);
	if (filler_lines < 0)
	{
	    if (filler_lines == -1)
	    {
		change_start = MAXCOL;
		change_end = -1;
		if (diff_find_change(curwin, lnum, &change_start, &change_end))
		    hlID = HLF_ADD;	/* added line */
		else
		    hlID = HLF_CHD;	/* changed line */
	    }
	    else
		hlID = HLF_ADD;	/* added line */
	}
	else
	    hlID = (hlf_T)0;
	prev_lnum = lnum;
	changedtick = curbuf->b_changedtick;
	fnum = curbuf->b_fnum;
    }

    if (hlID == HLF_CHD || hlID == HLF_TXD)
    {
	col = get_tv_number(&argvars[1]) - 1; /* ignore type error in {col} */
	if (col >= change_start && col <= change_end)
	    hlID = HLF_TXD;			/* changed text */
	else
	    hlID = HLF_CHD;			/* changed line */
    }
    rettv->vval.v_number = hlID == (hlf_T)0 ? 0 : (int)hlID;
#endif
}

/*
 * "empty({expr})" function
 */
    static void
f_empty(typval_T *argvars, typval_T *rettv)
{
    int		n;

    switch (argvars[0].v_type)
    {
	case VAR_STRING:
	case VAR_FUNC:
	    n = argvars[0].vval.v_string == NULL
					  || *argvars[0].vval.v_string == NUL;
	    break;
	case VAR_NUMBER:
	    n = argvars[0].vval.v_number == 0;
	    break;
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    n = argvars[0].vval.v_float == 0.0;
	    break;
#endif
	case VAR_LIST:
	    n = argvars[0].vval.v_list == NULL
				  || argvars[0].vval.v_list->lv_first == NULL;
	    break;
	case VAR_DICT:
	    n = argvars[0].vval.v_dict == NULL
			|| argvars[0].vval.v_dict->dv_hashtab.ht_used == 0;
	    break;
	case VAR_SPECIAL:
	    n = argvars[0].vval.v_number != VVAL_TRUE;
	    break;

	case VAR_UNKNOWN:
	    EMSG2(_(e_intern2), "f_empty(UNKNOWN)");
	    n = TRUE;
	    break;
    }

    rettv->vval.v_number = n;
}

/*
 * "escape({string}, {chars})" function
 */
    static void
f_escape(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];

    rettv->vval.v_string = vim_strsave_escaped(get_tv_string(&argvars[0]),
					 get_tv_string_buf(&argvars[1], buf));
    rettv->v_type = VAR_STRING;
}

/*
 * "eval()" function
 */
    static void
f_eval(typval_T *argvars, typval_T *rettv)
{
    char_u	*s, *p;

    s = get_tv_string_chk(&argvars[0]);
    if (s != NULL)
	s = skipwhite(s);

    p = s;
    if (s == NULL || eval1(&s, rettv, TRUE) == FAIL)
    {
	if (p != NULL && !aborting())
	    EMSG2(_(e_invexpr2), p);
	need_clr_eos = FALSE;
	rettv->v_type = VAR_NUMBER;
	rettv->vval.v_number = 0;
    }
    else if (*s != NUL)
	EMSG(_(e_trailing));
}

/*
 * "eventhandler()" function
 */
    static void
f_eventhandler(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = vgetc_busy;
}

/*
 * "executable()" function
 */
    static void
f_executable(typval_T *argvars, typval_T *rettv)
{
    char_u *name = get_tv_string(&argvars[0]);

    /* Check in $PATH and also check directly if there is a directory name. */
    rettv->vval.v_number = mch_can_exe(name, NULL, TRUE)
		 || (gettail(name) != name && mch_can_exe(name, NULL, FALSE));
}

/*
 * "exepath()" function
 */
    static void
f_exepath(typval_T *argvars, typval_T *rettv)
{
    char_u *p = NULL;

    (void)mch_can_exe(get_tv_string(&argvars[0]), &p, TRUE);
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = p;
}

/*
 * "exists()" function
 */
    static void
f_exists(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;
    char_u	*name;
    int		n = FALSE;
    int		len = 0;

    p = get_tv_string(&argvars[0]);
    if (*p == '$')			/* environment variable */
    {
	/* first try "normal" environment variables (fast) */
	if (mch_getenv(p + 1) != NULL)
	    n = TRUE;
	else
	{
	    /* try expanding things like $VIM and ${HOME} */
	    p = expand_env_save(p);
	    if (p != NULL && *p != '$')
		n = TRUE;
	    vim_free(p);
	}
    }
    else if (*p == '&' || *p == '+')			/* option */
    {
	n = (get_option_tv(&p, NULL, TRUE) == OK);
	if (*skipwhite(p) != NUL)
	    n = FALSE;			/* trailing garbage */
    }
    else if (*p == '*')			/* internal or user defined function */
    {
	n = function_exists(p + 1);
    }
    else if (*p == ':')
    {
	n = cmd_exists(p + 1);
    }
    else if (*p == '#')
    {
#ifdef FEAT_AUTOCMD
	if (p[1] == '#')
	    n = autocmd_supported(p + 2);
	else
	    n = au_exists(p + 1);
#endif
    }
    else				/* internal variable */
    {
	char_u	    *tofree;
	typval_T    tv;

	/* get_name_len() takes care of expanding curly braces */
	name = p;
	len = get_name_len(&p, &tofree, TRUE, FALSE);
	if (len > 0)
	{
	    if (tofree != NULL)
		name = tofree;
	    n = (get_var_tv(name, len, &tv, NULL, FALSE, TRUE) == OK);
	    if (n)
	    {
		/* handle d.key, l[idx], f(expr) */
		n = (handle_subscript(&p, &tv, TRUE, FALSE) == OK);
		if (n)
		    clear_tv(&tv);
	    }
	}
	if (*p != NUL)
	    n = FALSE;

	vim_free(tofree);
    }

    rettv->vval.v_number = n;
}

#ifdef FEAT_FLOAT
/*
 * "exp()" function
 */
    static void
f_exp(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = exp(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "expand()" function
 */
    static void
f_expand(typval_T *argvars, typval_T *rettv)
{
    char_u	*s;
    int		len;
    char_u	*errormsg;
    int		options = WILD_SILENT|WILD_USE_NL|WILD_LIST_NOTFOUND;
    expand_T	xpc;
    int		error = FALSE;
    char_u	*result;

    rettv->v_type = VAR_STRING;
    if (argvars[1].v_type != VAR_UNKNOWN
	    && argvars[2].v_type != VAR_UNKNOWN
	    && get_tv_number_chk(&argvars[2], &error)
	    && !error)
    {
	rettv->v_type = VAR_LIST;
	rettv->vval.v_list = NULL;
    }

    s = get_tv_string(&argvars[0]);
    if (*s == '%' || *s == '#' || *s == '<')
    {
	++emsg_off;
	result = eval_vars(s, s, &len, NULL, &errormsg, NULL);
	--emsg_off;
	if (rettv->v_type == VAR_LIST)
	{
	    if (rettv_list_alloc(rettv) != FAIL && result != NULL)
		list_append_string(rettv->vval.v_list, result, -1);
	    else
		vim_free(result);
	}
	else
	    rettv->vval.v_string = result;
    }
    else
    {
	/* When the optional second argument is non-zero, don't remove matches
	 * for 'wildignore' and don't put matches for 'suffixes' at the end. */
	if (argvars[1].v_type != VAR_UNKNOWN
				    && get_tv_number_chk(&argvars[1], &error))
	    options |= WILD_KEEP_ALL;
	if (!error)
	{
	    ExpandInit(&xpc);
	    xpc.xp_context = EXPAND_FILES;
	    if (p_wic)
		options += WILD_ICASE;
	    if (rettv->v_type == VAR_STRING)
		rettv->vval.v_string = ExpandOne(&xpc, s, NULL,
							   options, WILD_ALL);
	    else if (rettv_list_alloc(rettv) != FAIL)
	    {
		int i;

		ExpandOne(&xpc, s, NULL, options, WILD_ALL_KEEP);
		for (i = 0; i < xpc.xp_numfiles; i++)
		    list_append_string(rettv->vval.v_list, xpc.xp_files[i], -1);
		ExpandCleanup(&xpc);
	    }
	}
	else
	    rettv->vval.v_string = NULL;
    }
}

/*
 * Go over all entries in "d2" and add them to "d1".
 * When "action" is "error" then a duplicate key is an error.
 * When "action" is "force" then a duplicate key is overwritten.
 * Otherwise duplicate keys are ignored ("action" is "keep").
 */
    void
dict_extend(dict_T *d1, dict_T *d2, char_u *action)
{
    dictitem_T	*di1;
    hashitem_T	*hi2;
    int		todo;
    char_u	*arg_errmsg = (char_u *)N_("extend() argument");

    todo = (int)d2->dv_hashtab.ht_used;
    for (hi2 = d2->dv_hashtab.ht_array; todo > 0; ++hi2)
    {
	if (!HASHITEM_EMPTY(hi2))
	{
	    --todo;
	    di1 = dict_find(d1, hi2->hi_key, -1);
	    if (d1->dv_scope != 0)
	    {
		/* Disallow replacing a builtin function in l: and g:.
		 * Check the key to be valid when adding to any
		 * scope. */
		if (d1->dv_scope == VAR_DEF_SCOPE
			&& HI2DI(hi2)->di_tv.v_type == VAR_FUNC
			&& var_check_func_name(hi2->hi_key,
							 di1 == NULL))
		    break;
		if (!valid_varname(hi2->hi_key))
		    break;
	    }
	    if (di1 == NULL)
	    {
		di1 = dictitem_copy(HI2DI(hi2));
		if (di1 != NULL && dict_add(d1, di1) == FAIL)
		    dictitem_free(di1);
	    }
	    else if (*action == 'e')
	    {
		EMSG2(_("E737: Key already exists: %s"), hi2->hi_key);
		break;
	    }
	    else if (*action == 'f' && HI2DI(hi2) != di1)
	    {
		if (tv_check_lock(di1->di_tv.v_lock, arg_errmsg, TRUE)
		      || var_check_ro(di1->di_flags, arg_errmsg, TRUE))
		    break;
		clear_tv(&di1->di_tv);
		copy_tv(&HI2DI(hi2)->di_tv, &di1->di_tv);
	    }
	}
    }
}

/*
 * "extend(list, list [, idx])" function
 * "extend(dict, dict [, action])" function
 */
    static void
f_extend(typval_T *argvars, typval_T *rettv)
{
    char_u      *arg_errmsg = (char_u *)N_("extend() argument");

    if (argvars[0].v_type == VAR_LIST && argvars[1].v_type == VAR_LIST)
    {
	list_T		*l1, *l2;
	listitem_T	*item;
	long		before;
	int		error = FALSE;

	l1 = argvars[0].vval.v_list;
	l2 = argvars[1].vval.v_list;
	if (l1 != NULL && !tv_check_lock(l1->lv_lock, arg_errmsg, TRUE)
		&& l2 != NULL)
	{
	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		before = get_tv_number_chk(&argvars[2], &error);
		if (error)
		    return;		/* type error; errmsg already given */

		if (before == l1->lv_len)
		    item = NULL;
		else
		{
		    item = list_find(l1, before);
		    if (item == NULL)
		    {
			EMSGN(_(e_listidx), before);
			return;
		    }
		}
	    }
	    else
		item = NULL;
	    list_extend(l1, l2, item);

	    copy_tv(&argvars[0], rettv);
	}
    }
    else if (argvars[0].v_type == VAR_DICT && argvars[1].v_type == VAR_DICT)
    {
	dict_T	*d1, *d2;
	char_u	*action;
	int	i;

	d1 = argvars[0].vval.v_dict;
	d2 = argvars[1].vval.v_dict;
	if (d1 != NULL && !tv_check_lock(d1->dv_lock, arg_errmsg, TRUE)
		&& d2 != NULL)
	{
	    /* Check the third argument. */
	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		static char *(av[]) = {"keep", "force", "error"};

		action = get_tv_string_chk(&argvars[2]);
		if (action == NULL)
		    return;		/* type error; errmsg already given */
		for (i = 0; i < 3; ++i)
		    if (STRCMP(action, av[i]) == 0)
			break;
		if (i == 3)
		{
		    EMSG2(_(e_invarg2), action);
		    return;
		}
	    }
	    else
		action = (char_u *)"force";

	    dict_extend(d1, d2, action);

	    copy_tv(&argvars[0], rettv);
	}
    }
    else
	EMSG2(_(e_listdictarg), "extend()");
}

/*
 * "feedkeys()" function
 */
    static void
f_feedkeys(typval_T *argvars, typval_T *rettv UNUSED)
{
    int		remap = TRUE;
    int		insert = FALSE;
    char_u	*keys, *flags;
    char_u	nbuf[NUMBUFLEN];
    int		typed = FALSE;
    int		execute = FALSE;
    char_u	*keys_esc;

    /* This is not allowed in the sandbox.  If the commands would still be
     * executed in the sandbox it would be OK, but it probably happens later,
     * when "sandbox" is no longer set. */
    if (check_secure())
	return;

    keys = get_tv_string(&argvars[0]);
    if (*keys != NUL)
    {
	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    flags = get_tv_string_buf(&argvars[1], nbuf);
	    for ( ; *flags != NUL; ++flags)
	    {
		switch (*flags)
		{
		    case 'n': remap = FALSE; break;
		    case 'm': remap = TRUE; break;
		    case 't': typed = TRUE; break;
		    case 'i': insert = TRUE; break;
		    case 'x': execute = TRUE; break;
		}
	    }
	}

	/* Need to escape K_SPECIAL and CSI before putting the string in the
	 * typeahead buffer. */
	keys_esc = vim_strsave_escape_csi(keys);
	if (keys_esc != NULL)
	{
	    ins_typebuf(keys_esc, (remap ? REMAP_YES : REMAP_NONE),
				  insert ? 0 : typebuf.tb_len, !typed, FALSE);
	    vim_free(keys_esc);
	    if (vgetc_busy)
		typebuf_was_filled = TRUE;
	    if (execute)
		exec_normal(TRUE);
	}
    }
}

/*
 * "filereadable()" function
 */
    static void
f_filereadable(typval_T *argvars, typval_T *rettv)
{
    int		fd;
    char_u	*p;
    int		n;

#ifndef O_NONBLOCK
# define O_NONBLOCK 0
#endif
    p = get_tv_string(&argvars[0]);
    if (*p && !mch_isdir(p) && (fd = mch_open((char *)p,
					      O_RDONLY | O_NONBLOCK, 0)) >= 0)
    {
	n = TRUE;
	close(fd);
    }
    else
	n = FALSE;

    rettv->vval.v_number = n;
}

/*
 * Return 0 for not writable, 1 for writable file, 2 for a dir which we have
 * rights to write into.
 */
    static void
f_filewritable(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = filewritable(get_tv_string(&argvars[0]));
}

    static void
findfilendir(
    typval_T	*argvars UNUSED,
    typval_T	*rettv,
    int		find_what UNUSED)
{
#ifdef FEAT_SEARCHPATH
    char_u	*fname;
    char_u	*fresult = NULL;
    char_u	*path = *curbuf->b_p_path == NUL ? p_path : curbuf->b_p_path;
    char_u	*p;
    char_u	pathbuf[NUMBUFLEN];
    int		count = 1;
    int		first = TRUE;
    int		error = FALSE;
#endif

    rettv->vval.v_string = NULL;
    rettv->v_type = VAR_STRING;

#ifdef FEAT_SEARCHPATH
    fname = get_tv_string(&argvars[0]);

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	p = get_tv_string_buf_chk(&argvars[1], pathbuf);
	if (p == NULL)
	    error = TRUE;
	else
	{
	    if (*p != NUL)
		path = p;

	    if (argvars[2].v_type != VAR_UNKNOWN)
		count = get_tv_number_chk(&argvars[2], &error);
	}
    }

    if (count < 0 && rettv_list_alloc(rettv) == FAIL)
	error = TRUE;

    if (*fname != NUL && !error)
    {
	do
	{
	    if (rettv->v_type == VAR_STRING || rettv->v_type == VAR_LIST)
		vim_free(fresult);
	    fresult = find_file_in_path_option(first ? fname : NULL,
					       first ? (int)STRLEN(fname) : 0,
					0, first, path,
					find_what,
					curbuf->b_ffname,
					find_what == FINDFILE_DIR
					    ? (char_u *)"" : curbuf->b_p_sua);
	    first = FALSE;

	    if (fresult != NULL && rettv->v_type == VAR_LIST)
		list_append_string(rettv->vval.v_list, fresult, -1);

	} while ((rettv->v_type == VAR_LIST || --count > 0) && fresult != NULL);
    }

    if (rettv->v_type == VAR_STRING)
	rettv->vval.v_string = fresult;
#endif
}

static void filter_map(typval_T *argvars, typval_T *rettv, int map);
static int filter_map_one(typval_T *tv, char_u *expr, int map, int *remp);

/*
 * Implementation of map() and filter().
 */
    static void
filter_map(typval_T *argvars, typval_T *rettv, int map)
{
    char_u	buf[NUMBUFLEN];
    char_u	*expr;
    listitem_T	*li, *nli;
    list_T	*l = NULL;
    dictitem_T	*di;
    hashtab_T	*ht;
    hashitem_T	*hi;
    dict_T	*d = NULL;
    typval_T	save_val;
    typval_T	save_key;
    int		rem;
    int		todo;
    char_u	*ermsg = (char_u *)(map ? "map()" : "filter()");
    char_u	*arg_errmsg = (char_u *)(map ? N_("map() argument")
				   : N_("filter() argument"));
    int		save_did_emsg;
    int		idx = 0;

    if (argvars[0].v_type == VAR_LIST)
    {
	if ((l = argvars[0].vval.v_list) == NULL
	      || (!map && tv_check_lock(l->lv_lock, arg_errmsg, TRUE)))
	    return;
    }
    else if (argvars[0].v_type == VAR_DICT)
    {
	if ((d = argvars[0].vval.v_dict) == NULL
	      || (!map && tv_check_lock(d->dv_lock, arg_errmsg, TRUE)))
	    return;
    }
    else
    {
	EMSG2(_(e_listdictarg), ermsg);
	return;
    }

    expr = get_tv_string_buf_chk(&argvars[1], buf);
    /* On type errors, the preceding call has already displayed an error
     * message.  Avoid a misleading error message for an empty string that
     * was not passed as argument. */
    if (expr != NULL)
    {
	prepare_vimvar(VV_VAL, &save_val);
	expr = skipwhite(expr);

	/* We reset "did_emsg" to be able to detect whether an error
	 * occurred during evaluation of the expression. */
	save_did_emsg = did_emsg;
	did_emsg = FALSE;

	prepare_vimvar(VV_KEY, &save_key);
	if (argvars[0].v_type == VAR_DICT)
	{
	    vimvars[VV_KEY].vv_type = VAR_STRING;

	    ht = &d->dv_hashtab;
	    hash_lock(ht);
	    todo = (int)ht->ht_used;
	    for (hi = ht->ht_array; todo > 0; ++hi)
	    {
		if (!HASHITEM_EMPTY(hi))
		{
		    int r;

		    --todo;
		    di = HI2DI(hi);
		    if (map &&
			    (tv_check_lock(di->di_tv.v_lock, arg_errmsg, TRUE)
			    || var_check_ro(di->di_flags, arg_errmsg, TRUE)))
			break;
		    vimvars[VV_KEY].vv_str = vim_strsave(di->di_key);
		    r = filter_map_one(&di->di_tv, expr, map, &rem);
		    clear_tv(&vimvars[VV_KEY].vv_tv);
		    if (r == FAIL || did_emsg)
			break;
		    if (!map && rem)
		    {
			if (var_check_fixed(di->di_flags, arg_errmsg, TRUE)
			    || var_check_ro(di->di_flags, arg_errmsg, TRUE))
			    break;
			dictitem_remove(d, di);
		    }
		}
	    }
	    hash_unlock(ht);
	}
	else
	{
	    vimvars[VV_KEY].vv_type = VAR_NUMBER;

	    for (li = l->lv_first; li != NULL; li = nli)
	    {
		if (map && tv_check_lock(li->li_tv.v_lock, arg_errmsg, TRUE))
		    break;
		nli = li->li_next;
		vimvars[VV_KEY].vv_nr = idx;
		if (filter_map_one(&li->li_tv, expr, map, &rem) == FAIL
								  || did_emsg)
		    break;
		if (!map && rem)
		    listitem_remove(l, li);
		++idx;
	    }
	}

	restore_vimvar(VV_KEY, &save_key);
	restore_vimvar(VV_VAL, &save_val);

	did_emsg |= save_did_emsg;
    }

    copy_tv(&argvars[0], rettv);
}

    static int
filter_map_one(typval_T *tv, char_u *expr, int map, int *remp)
{
    typval_T	rettv;
    char_u	*s;
    int		retval = FAIL;

    copy_tv(tv, &vimvars[VV_VAL].vv_tv);
    s = expr;
    if (eval1(&s, &rettv, TRUE) == FAIL)
	goto theend;
    if (*s != NUL)  /* check for trailing chars after expr */
    {
	EMSG2(_(e_invexpr2), s);
	clear_tv(&rettv);
	goto theend;
    }
    if (map)
    {
	/* map(): replace the list item value */
	clear_tv(tv);
	rettv.v_lock = 0;
	*tv = rettv;
    }
    else
    {
	int	    error = FALSE;

	/* filter(): when expr is zero remove the item */
	*remp = (get_tv_number_chk(&rettv, &error) == 0);
	clear_tv(&rettv);
	/* On type error, nothing has been removed; return FAIL to stop the
	 * loop.  The error message was given by get_tv_number_chk(). */
	if (error)
	    goto theend;
    }
    retval = OK;
theend:
    clear_tv(&vimvars[VV_VAL].vv_tv);
    return retval;
}

/*
 * "filter()" function
 */
    static void
f_filter(typval_T *argvars, typval_T *rettv)
{
    filter_map(argvars, rettv, FALSE);
}

/*
 * "finddir({fname}[, {path}[, {count}]])" function
 */
    static void
f_finddir(typval_T *argvars, typval_T *rettv)
{
    findfilendir(argvars, rettv, FINDFILE_DIR);
}

/*
 * "findfile({fname}[, {path}[, {count}]])" function
 */
    static void
f_findfile(typval_T *argvars, typval_T *rettv)
{
    findfilendir(argvars, rettv, FINDFILE_FILE);
}

#ifdef FEAT_FLOAT
/*
 * "float2nr({float})" function
 */
    static void
f_float2nr(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    if (get_float_arg(argvars, &f) == OK)
    {
	if (f < -0x7fffffff)
	    rettv->vval.v_number = -0x7fffffff;
	else if (f > 0x7fffffff)
	    rettv->vval.v_number = 0x7fffffff;
	else
	    rettv->vval.v_number = (varnumber_T)f;
    }
}

/*
 * "floor({float})" function
 */
    static void
f_floor(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = floor(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "fmod()" function
 */
    static void
f_fmod(typval_T *argvars, typval_T *rettv)
{
    float_T	fx, fy;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &fx) == OK
				     && get_float_arg(&argvars[1], &fy) == OK)
	rettv->vval.v_float = fmod(fx, fy);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "fnameescape({string})" function
 */
    static void
f_fnameescape(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_string = vim_strsave_fnameescape(
					   get_tv_string(&argvars[0]), FALSE);
    rettv->v_type = VAR_STRING;
}

/*
 * "fnamemodify({fname}, {mods})" function
 */
    static void
f_fnamemodify(typval_T *argvars, typval_T *rettv)
{
    char_u	*fname;
    char_u	*mods;
    int		usedlen = 0;
    int		len;
    char_u	*fbuf = NULL;
    char_u	buf[NUMBUFLEN];

    fname = get_tv_string_chk(&argvars[0]);
    mods = get_tv_string_buf_chk(&argvars[1], buf);
    if (fname == NULL || mods == NULL)
	fname = NULL;
    else
    {
	len = (int)STRLEN(fname);
	(void)modify_fname(mods, &usedlen, &fname, &fbuf, &len);
    }

    rettv->v_type = VAR_STRING;
    if (fname == NULL)
	rettv->vval.v_string = NULL;
    else
	rettv->vval.v_string = vim_strnsave(fname, len);
    vim_free(fbuf);
}

static void foldclosed_both(typval_T *argvars, typval_T *rettv, int end);

/*
 * "foldclosed()" function
 */
    static void
foldclosed_both(
    typval_T	*argvars UNUSED,
    typval_T	*rettv,
    int		end UNUSED)
{
#ifdef FEAT_FOLDING
    linenr_T	lnum;
    linenr_T	first, last;

    lnum = get_tv_lnum(argvars);
    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
    {
	if (hasFoldingWin(curwin, lnum, &first, &last, FALSE, NULL))
	{
	    if (end)
		rettv->vval.v_number = (varnumber_T)last;
	    else
		rettv->vval.v_number = (varnumber_T)first;
	    return;
	}
    }
#endif
    rettv->vval.v_number = -1;
}

/*
 * "foldclosed()" function
 */
    static void
f_foldclosed(typval_T *argvars, typval_T *rettv)
{
    foldclosed_both(argvars, rettv, FALSE);
}

/*
 * "foldclosedend()" function
 */
    static void
f_foldclosedend(typval_T *argvars, typval_T *rettv)
{
    foldclosed_both(argvars, rettv, TRUE);
}

/*
 * "foldlevel()" function
 */
    static void
f_foldlevel(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_FOLDING
    linenr_T	lnum;

    lnum = get_tv_lnum(argvars);
    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
	rettv->vval.v_number = foldLevel(lnum);
#endif
}

/*
 * "foldtext()" function
 */
    static void
f_foldtext(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_FOLDING
    linenr_T	lnum;
    char_u	*s;
    char_u	*r;
    int		len;
    char	*txt;
#endif

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_FOLDING
    if ((linenr_T)vimvars[VV_FOLDSTART].vv_nr > 0
	    && (linenr_T)vimvars[VV_FOLDEND].vv_nr
						 <= curbuf->b_ml.ml_line_count
	    && vimvars[VV_FOLDDASHES].vv_str != NULL)
    {
	/* Find first non-empty line in the fold. */
	lnum = (linenr_T)vimvars[VV_FOLDSTART].vv_nr;
	while (lnum < (linenr_T)vimvars[VV_FOLDEND].vv_nr)
	{
	    if (!linewhite(lnum))
		break;
	    ++lnum;
	}

	/* Find interesting text in this line. */
	s = skipwhite(ml_get(lnum));
	/* skip C comment-start */
	if (s[0] == '/' && (s[1] == '*' || s[1] == '/'))
	{
	    s = skipwhite(s + 2);
	    if (*skipwhite(s) == NUL
			    && lnum + 1 < (linenr_T)vimvars[VV_FOLDEND].vv_nr)
	    {
		s = skipwhite(ml_get(lnum + 1));
		if (*s == '*')
		    s = skipwhite(s + 1);
	    }
	}
	txt = _("+-%s%3ld lines: ");
	r = alloc((unsigned)(STRLEN(txt)
		    + STRLEN(vimvars[VV_FOLDDASHES].vv_str)    /* for %s */
		    + 20				    /* for %3ld */
		    + STRLEN(s)));			    /* concatenated */
	if (r != NULL)
	{
	    sprintf((char *)r, txt, vimvars[VV_FOLDDASHES].vv_str,
		    (long)((linenr_T)vimvars[VV_FOLDEND].vv_nr
				- (linenr_T)vimvars[VV_FOLDSTART].vv_nr + 1));
	    len = (int)STRLEN(r);
	    STRCAT(r, s);
	    /* remove 'foldmarker' and 'commentstring' */
	    foldtext_cleanup(r + len);
	    rettv->vval.v_string = r;
	}
    }
#endif
}

/*
 * "foldtextresult(lnum)" function
 */
    static void
f_foldtextresult(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_FOLDING
    linenr_T	lnum;
    char_u	*text;
    char_u	buf[51];
    foldinfo_T  foldinfo;
    int		fold_count;
#endif

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_FOLDING
    lnum = get_tv_lnum(argvars);
    /* treat illegal types and illegal string values for {lnum} the same */
    if (lnum < 0)
	lnum = 0;
    fold_count = foldedCount(curwin, lnum, &foldinfo);
    if (fold_count > 0)
    {
	text = get_foldtext(curwin, lnum, lnum + fold_count - 1,
							      &foldinfo, buf);
	if (text == buf)
	    text = vim_strsave(text);
	rettv->vval.v_string = text;
    }
#endif
}

/*
 * "foreground()" function
 */
    static void
f_foreground(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_GUI
    if (gui.in_use)
	gui_mch_set_foreground();
#else
# ifdef WIN32
    win32_set_foreground();
# endif
#endif
}

/*
 * "function()" function
 */
    static void
f_function(typval_T *argvars, typval_T *rettv)
{
    char_u	*s;

    s = get_tv_string(&argvars[0]);
    if (s == NULL || *s == NUL || VIM_ISDIGIT(*s))
	EMSG2(_(e_invarg2), s);
    /* Don't check an autoload name for existence here. */
    else if (vim_strchr(s, AUTOLOAD_CHAR) == NULL && !function_exists(s))
	EMSG2(_("E700: Unknown function: %s"), s);
    else
    {
	if (STRNCMP(s, "s:", 2) == 0 || STRNCMP(s, "<SID>", 5) == 0)
	{
	    char	sid_buf[25];
	    int		off = *s == 's' ? 2 : 5;

	    /* Expand s: and <SID> into <SNR>nr_, so that the function can
	     * also be called from another script. Using trans_function_name()
	     * would also work, but some plugins depend on the name being
	     * printable text. */
	    sprintf(sid_buf, "<SNR>%ld_", (long)current_SID);
	    rettv->vval.v_string =
			    alloc((int)(STRLEN(sid_buf) + STRLEN(s + off) + 1));
	    if (rettv->vval.v_string != NULL)
	    {
		STRCPY(rettv->vval.v_string, sid_buf);
		STRCAT(rettv->vval.v_string, s + off);
	    }
	}
	else
	    rettv->vval.v_string = vim_strsave(s);
	rettv->v_type = VAR_FUNC;
    }
}

/*
 * "garbagecollect()" function
 */
    static void
f_garbagecollect(typval_T *argvars, typval_T *rettv UNUSED)
{
    /* This is postponed until we are back at the toplevel, because we may be
     * using Lists and Dicts internally.  E.g.: ":echo [garbagecollect()]". */
    want_garbage_collect = TRUE;

    if (argvars[0].v_type != VAR_UNKNOWN && get_tv_number(&argvars[0]) == 1)
	garbage_collect_at_exit = TRUE;
}

/*
 * "get()" function
 */
    static void
f_get(typval_T *argvars, typval_T *rettv)
{
    listitem_T	*li;
    list_T	*l;
    dictitem_T	*di;
    dict_T	*d;
    typval_T	*tv = NULL;

    if (argvars[0].v_type == VAR_LIST)
    {
	if ((l = argvars[0].vval.v_list) != NULL)
	{
	    int		error = FALSE;

	    li = list_find(l, get_tv_number_chk(&argvars[1], &error));
	    if (!error && li != NULL)
		tv = &li->li_tv;
	}
    }
    else if (argvars[0].v_type == VAR_DICT)
    {
	if ((d = argvars[0].vval.v_dict) != NULL)
	{
	    di = dict_find(d, get_tv_string(&argvars[1]), -1);
	    if (di != NULL)
		tv = &di->di_tv;
	}
    }
    else
	EMSG2(_(e_listdictarg), "get()");

    if (tv == NULL)
    {
	if (argvars[2].v_type != VAR_UNKNOWN)
	    copy_tv(&argvars[2], rettv);
    }
    else
	copy_tv(tv, rettv);
}

static void get_buffer_lines(buf_T *buf, linenr_T start, linenr_T end, int retlist, typval_T *rettv);

/*
 * Get line or list of lines from buffer "buf" into "rettv".
 * Return a range (from start to end) of lines in rettv from the specified
 * buffer.
 * If 'retlist' is TRUE, then the lines are returned as a Vim List.
 */
    static void
get_buffer_lines(
    buf_T	*buf,
    linenr_T	start,
    linenr_T	end,
    int		retlist,
    typval_T	*rettv)
{
    char_u	*p;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
    if (retlist && rettv_list_alloc(rettv) == FAIL)
	return;

    if (buf == NULL || buf->b_ml.ml_mfp == NULL || start < 0)
	return;

    if (!retlist)
    {
	if (start >= 1 && start <= buf->b_ml.ml_line_count)
	    p = ml_get_buf(buf, start, FALSE);
	else
	    p = (char_u *)"";
	rettv->vval.v_string = vim_strsave(p);
    }
    else
    {
	if (end < start)
	    return;

	if (start < 1)
	    start = 1;
	if (end > buf->b_ml.ml_line_count)
	    end = buf->b_ml.ml_line_count;
	while (start <= end)
	    if (list_append_string(rettv->vval.v_list,
				 ml_get_buf(buf, start++, FALSE), -1) == FAIL)
		break;
    }
}

/*
 * "getbufline()" function
 */
    static void
f_getbufline(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;
    linenr_T	end;
    buf_T	*buf;

    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    ++emsg_off;
    buf = get_buf_tv(&argvars[0], FALSE);
    --emsg_off;

    lnum = get_tv_lnum_buf(&argvars[1], buf);
    if (argvars[2].v_type == VAR_UNKNOWN)
	end = lnum;
    else
	end = get_tv_lnum_buf(&argvars[2], buf);

    get_buffer_lines(buf, lnum, end, TRUE, rettv);
}

/*
 * "getbufvar()" function
 */
    static void
f_getbufvar(typval_T *argvars, typval_T *rettv)
{
    buf_T	*buf;
    buf_T	*save_curbuf;
    char_u	*varname;
    dictitem_T	*v;
    int		done = FALSE;

    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    varname = get_tv_string_chk(&argvars[1]);
    ++emsg_off;
    buf = get_buf_tv(&argvars[0], FALSE);

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    if (buf != NULL && varname != NULL)
    {
	/* set curbuf to be our buf, temporarily */
	save_curbuf = curbuf;
	curbuf = buf;

	if (*varname == '&')	/* buffer-local-option */
	{
	    if (get_option_tv(&varname, rettv, TRUE) == OK)
		done = TRUE;
	}
	else if (STRCMP(varname, "changedtick") == 0)
	{
	    rettv->v_type = VAR_NUMBER;
	    rettv->vval.v_number = curbuf->b_changedtick;
	    done = TRUE;
	}
	else
	{
	    /* Look up the variable. */
	    /* Let getbufvar({nr}, "") return the "b:" dictionary. */
	    v = find_var_in_ht(&curbuf->b_vars->dv_hashtab,
							 'b', varname, FALSE);
	    if (v != NULL)
	    {
		copy_tv(&v->di_tv, rettv);
		done = TRUE;
	    }
	}

	/* restore previous notion of curbuf */
	curbuf = save_curbuf;
    }

    if (!done && argvars[2].v_type != VAR_UNKNOWN)
	/* use the default value */
	copy_tv(&argvars[2], rettv);

    --emsg_off;
}

/*
 * "getchar()" function
 */
    static void
f_getchar(typval_T *argvars, typval_T *rettv)
{
    varnumber_T		n;
    int			error = FALSE;

    /* Position the cursor.  Needed after a message that ends in a space. */
    windgoto(msg_row, msg_col);

    ++no_mapping;
    ++allow_keys;
    for (;;)
    {
	if (argvars[0].v_type == VAR_UNKNOWN)
	    /* getchar(): blocking wait. */
	    n = safe_vgetc();
	else if (get_tv_number_chk(&argvars[0], &error) == 1)
	    /* getchar(1): only check if char avail */
	    n = vpeekc_any();
	else if (error || vpeekc_any() == NUL)
	    /* illegal argument or getchar(0) and no char avail: return zero */
	    n = 0;
	else
	    /* getchar(0) and char avail: return char */
	    n = safe_vgetc();

	if (n == K_IGNORE)
	    continue;
	break;
    }
    --no_mapping;
    --allow_keys;

    vimvars[VV_MOUSE_WIN].vv_nr = 0;
    vimvars[VV_MOUSE_LNUM].vv_nr = 0;
    vimvars[VV_MOUSE_COL].vv_nr = 0;

    rettv->vval.v_number = n;
    if (IS_SPECIAL(n) || mod_mask != 0)
    {
	char_u		temp[10];   /* modifier: 3, mbyte-char: 6, NUL: 1 */
	int		i = 0;

	/* Turn a special key into three bytes, plus modifier. */
	if (mod_mask != 0)
	{
	    temp[i++] = K_SPECIAL;
	    temp[i++] = KS_MODIFIER;
	    temp[i++] = mod_mask;
	}
	if (IS_SPECIAL(n))
	{
	    temp[i++] = K_SPECIAL;
	    temp[i++] = K_SECOND(n);
	    temp[i++] = K_THIRD(n);
	}
#ifdef FEAT_MBYTE
	else if (has_mbyte)
	    i += (*mb_char2bytes)(n, temp + i);
#endif
	else
	    temp[i++] = n;
	temp[i++] = NUL;
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = vim_strsave(temp);

#ifdef FEAT_MOUSE
	if (is_mouse_key(n))
	{
	    int		row = mouse_row;
	    int		col = mouse_col;
	    win_T	*win;
	    linenr_T	lnum;
# ifdef FEAT_WINDOWS
	    win_T	*wp;
# endif
	    int		winnr = 1;

	    if (row >= 0 && col >= 0)
	    {
		/* Find the window at the mouse coordinates and compute the
		 * text position. */
		win = mouse_find_win(&row, &col);
		(void)mouse_comp_pos(win, &row, &col, &lnum);
# ifdef FEAT_WINDOWS
		for (wp = firstwin; wp != win; wp = wp->w_next)
		    ++winnr;
# endif
		vimvars[VV_MOUSE_WIN].vv_nr = winnr;
		vimvars[VV_MOUSE_LNUM].vv_nr = lnum;
		vimvars[VV_MOUSE_COL].vv_nr = col + 1;
	    }
	}
#endif
    }
}

/*
 * "getcharmod()" function
 */
    static void
f_getcharmod(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = mod_mask;
}

/*
 * "getcharsearch()" function
 */
    static void
f_getcharsearch(typval_T *argvars UNUSED, typval_T *rettv)
{
    if (rettv_dict_alloc(rettv) != FAIL)
    {
	dict_T *dict = rettv->vval.v_dict;

	dict_add_nr_str(dict, "char", 0L, last_csearch());
	dict_add_nr_str(dict, "forward", last_csearch_forward(), NULL);
	dict_add_nr_str(dict, "until", last_csearch_until(), NULL);
    }
}

/*
 * "getcmdline()" function
 */
    static void
f_getcmdline(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = get_cmdline_str();
}

/*
 * "getcmdpos()" function
 */
    static void
f_getcmdpos(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = get_cmdline_pos() + 1;
}

/*
 * "getcmdtype()" function
 */
    static void
f_getcmdtype(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = alloc(2);
    if (rettv->vval.v_string != NULL)
    {
	rettv->vval.v_string[0] = get_cmdline_type();
	rettv->vval.v_string[1] = NUL;
    }
}

/*
 * "getcmdwintype()" function
 */
    static void
f_getcmdwintype(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_CMDWIN
    rettv->vval.v_string = alloc(2);
    if (rettv->vval.v_string != NULL)
    {
	rettv->vval.v_string[0] = cmdwin_type;
	rettv->vval.v_string[1] = NUL;
    }
#endif
}

/*
 * "getcwd()" function
 */
    static void
f_getcwd(typval_T *argvars, typval_T *rettv)
{
    win_T	*wp = NULL;
    char_u	*cwd;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    wp = find_tabwin(&argvars[0], &argvars[1]);
    if (wp != NULL)
    {
	if (wp->w_localdir != NULL)
	    rettv->vval.v_string = vim_strsave(wp->w_localdir);
	else if(globaldir != NULL)
	    rettv->vval.v_string = vim_strsave(globaldir);
	else
	{
	    cwd = alloc(MAXPATHL);
	    if (cwd != NULL)
	    {
		if (mch_dirname(cwd, MAXPATHL) != FAIL)
		    rettv->vval.v_string = vim_strsave(cwd);
		vim_free(cwd);
	    }
	}
#ifdef BACKSLASH_IN_FILENAME
	if (rettv->vval.v_string != NULL)
	    slash_adjust(rettv->vval.v_string);
#endif
    }
}

/*
 * "getfontname()" function
 */
    static void
f_getfontname(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_GUI
    if (gui.in_use)
    {
	GuiFont font;
	char_u	*name = NULL;

	if (argvars[0].v_type == VAR_UNKNOWN)
	{
	    /* Get the "Normal" font.  Either the name saved by
	     * hl_set_font_name() or from the font ID. */
	    font = gui.norm_font;
	    name = hl_get_font_name();
	}
	else
	{
	    name = get_tv_string(&argvars[0]);
	    if (STRCMP(name, "*") == 0)	    /* don't use font dialog */
		return;
	    font = gui_mch_get_font(name, FALSE);
	    if (font == NOFONT)
		return;	    /* Invalid font name, return empty string. */
	}
	rettv->vval.v_string = gui_mch_get_fontname(font, name);
	if (argvars[0].v_type != VAR_UNKNOWN)
	    gui_mch_free_font(font);
    }
#endif
}

/*
 * "getfperm({fname})" function
 */
    static void
f_getfperm(typval_T *argvars, typval_T *rettv)
{
    char_u	*fname;
    struct stat st;
    char_u	*perm = NULL;
    char_u	flags[] = "rwx";
    int		i;

    fname = get_tv_string(&argvars[0]);

    rettv->v_type = VAR_STRING;
    if (mch_stat((char *)fname, &st) >= 0)
    {
	perm = vim_strsave((char_u *)"---------");
	if (perm != NULL)
	{
	    for (i = 0; i < 9; i++)
	    {
		if (st.st_mode & (1 << (8 - i)))
		    perm[i] = flags[i % 3];
	    }
	}
    }
    rettv->vval.v_string = perm;
}

/*
 * "getfsize({fname})" function
 */
    static void
f_getfsize(typval_T *argvars, typval_T *rettv)
{
    char_u	*fname;
    struct stat	st;

    fname = get_tv_string(&argvars[0]);

    rettv->v_type = VAR_NUMBER;

    if (mch_stat((char *)fname, &st) >= 0)
    {
	if (mch_isdir(fname))
	    rettv->vval.v_number = 0;
	else
	{
	    rettv->vval.v_number = (varnumber_T)st.st_size;

	    /* non-perfect check for overflow */
	    if ((off_t)rettv->vval.v_number != (off_t)st.st_size)
		rettv->vval.v_number = -2;
	}
    }
    else
	  rettv->vval.v_number = -1;
}

/*
 * "getftime({fname})" function
 */
    static void
f_getftime(typval_T *argvars, typval_T *rettv)
{
    char_u	*fname;
    struct stat	st;

    fname = get_tv_string(&argvars[0]);

    if (mch_stat((char *)fname, &st) >= 0)
	rettv->vval.v_number = (varnumber_T)st.st_mtime;
    else
	rettv->vval.v_number = -1;
}

/*
 * "getftype({fname})" function
 */
    static void
f_getftype(typval_T *argvars, typval_T *rettv)
{
    char_u	*fname;
    struct stat st;
    char_u	*type = NULL;
    char	*t;

    fname = get_tv_string(&argvars[0]);

    rettv->v_type = VAR_STRING;
    if (mch_lstat((char *)fname, &st) >= 0)
    {
#ifdef S_ISREG
	if (S_ISREG(st.st_mode))
	    t = "file";
	else if (S_ISDIR(st.st_mode))
	    t = "dir";
# ifdef S_ISLNK
	else if (S_ISLNK(st.st_mode))
	    t = "link";
# endif
# ifdef S_ISBLK
	else if (S_ISBLK(st.st_mode))
	    t = "bdev";
# endif
# ifdef S_ISCHR
	else if (S_ISCHR(st.st_mode))
	    t = "cdev";
# endif
# ifdef S_ISFIFO
	else if (S_ISFIFO(st.st_mode))
	    t = "fifo";
# endif
# ifdef S_ISSOCK
	else if (S_ISSOCK(st.st_mode))
	    t = "fifo";
# endif
	else
	    t = "other";
#else
# ifdef S_IFMT
	switch (st.st_mode & S_IFMT)
	{
	    case S_IFREG: t = "file"; break;
	    case S_IFDIR: t = "dir"; break;
#  ifdef S_IFLNK
	    case S_IFLNK: t = "link"; break;
#  endif
#  ifdef S_IFBLK
	    case S_IFBLK: t = "bdev"; break;
#  endif
#  ifdef S_IFCHR
	    case S_IFCHR: t = "cdev"; break;
#  endif
#  ifdef S_IFIFO
	    case S_IFIFO: t = "fifo"; break;
#  endif
#  ifdef S_IFSOCK
	    case S_IFSOCK: t = "socket"; break;
#  endif
	    default: t = "other";
	}
# else
	if (mch_isdir(fname))
	    t = "dir";
	else
	    t = "file";
# endif
#endif
	type = vim_strsave((char_u *)t);
    }
    rettv->vval.v_string = type;
}

/*
 * "getline(lnum, [end])" function
 */
    static void
f_getline(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;
    linenr_T	end;
    int		retlist;

    lnum = get_tv_lnum(argvars);
    if (argvars[1].v_type == VAR_UNKNOWN)
    {
	end = 0;
	retlist = FALSE;
    }
    else
    {
	end = get_tv_lnum(&argvars[1]);
	retlist = TRUE;
    }

    get_buffer_lines(curbuf, lnum, end, retlist, rettv);
}

/*
 * "getmatches()" function
 */
    static void
f_getmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    dict_T	*dict;
    matchitem_T	*cur = curwin->w_match_head;
    int		i;

    if (rettv_list_alloc(rettv) == OK)
    {
	while (cur != NULL)
	{
	    dict = dict_alloc();
	    if (dict == NULL)
		return;
	    if (cur->match.regprog == NULL)
	    {
		/* match added with matchaddpos() */
		for (i = 0; i < MAXPOSMATCH; ++i)
		{
		    llpos_T	*llpos;
		    char	buf[6];
		    list_T	*l;

		    llpos = &cur->pos.pos[i];
		    if (llpos->lnum == 0)
			break;
		    l = list_alloc();
		    if (l == NULL)
			break;
		    list_append_number(l, (varnumber_T)llpos->lnum);
		    if (llpos->col > 0)
		    {
			list_append_number(l, (varnumber_T)llpos->col);
			list_append_number(l, (varnumber_T)llpos->len);
		    }
		    sprintf(buf, "pos%d", i + 1);
		    dict_add_list(dict, buf, l);
		}
	    }
	    else
	    {
		dict_add_nr_str(dict, "pattern", 0L, cur->pattern);
	    }
	    dict_add_nr_str(dict, "group", 0L, syn_id2name(cur->hlg_id));
	    dict_add_nr_str(dict, "priority", (long)cur->priority, NULL);
	    dict_add_nr_str(dict, "id", (long)cur->id, NULL);
# ifdef FEAT_CONCEAL
	    if (cur->conceal_char)
	    {
		char_u buf[MB_MAXBYTES + 1];

		buf[(*mb_char2bytes)((int)cur->conceal_char, buf)] = NUL;
		dict_add_nr_str(dict, "conceal", 0L, (char_u *)&buf);
	    }
# endif
	    list_append_dict(rettv->vval.v_list, dict);
	    cur = cur->next;
	}
    }
#endif
}

/*
 * "getpid()" function
 */
    static void
f_getpid(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = mch_get_pid();
}

static void getpos_both(typval_T *argvars, typval_T *rettv, int getcurpos);

/*
 * "getcurpos()" function
 */
    static void
f_getcurpos(typval_T *argvars, typval_T *rettv)
{
    getpos_both(argvars, rettv, TRUE);
}

/*
 * "getpos(string)" function
 */
    static void
f_getpos(typval_T *argvars, typval_T *rettv)
{
    getpos_both(argvars, rettv, FALSE);
}

    static void
getpos_both(
    typval_T	*argvars,
    typval_T	*rettv,
    int		getcurpos)
{
    pos_T	*fp;
    list_T	*l;
    int		fnum = -1;

    if (rettv_list_alloc(rettv) == OK)
    {
	l = rettv->vval.v_list;
	if (getcurpos)
	    fp = &curwin->w_cursor;
	else
	    fp = var2fpos(&argvars[0], TRUE, &fnum);
	if (fnum != -1)
	    list_append_number(l, (varnumber_T)fnum);
	else
	    list_append_number(l, (varnumber_T)0);
	list_append_number(l, (fp != NULL) ? (varnumber_T)fp->lnum
							    : (varnumber_T)0);
	list_append_number(l, (fp != NULL)
		     ? (varnumber_T)(fp->col == MAXCOL ? MAXCOL : fp->col + 1)
							    : (varnumber_T)0);
	list_append_number(l,
#ifdef FEAT_VIRTUALEDIT
				(fp != NULL) ? (varnumber_T)fp->coladd :
#endif
							      (varnumber_T)0);
	if (getcurpos)
	    list_append_number(l, curwin->w_curswant == MAXCOL ?
		    (varnumber_T)MAXCOL : (varnumber_T)curwin->w_curswant + 1);
    }
    else
	rettv->vval.v_number = FALSE;
}

/*
 * "getqflist()" and "getloclist()" functions
 */
    static void
f_getqflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_QUICKFIX
    win_T	*wp;
#endif

#ifdef FEAT_QUICKFIX
    if (rettv_list_alloc(rettv) == OK)
    {
	wp = NULL;
	if (argvars[0].v_type != VAR_UNKNOWN)	/* getloclist() */
	{
	    wp = find_win_by_nr(&argvars[0], NULL);
	    if (wp == NULL)
		return;
	}

	(void)get_errorlist(wp, rettv->vval.v_list);
    }
#endif
}

/*
 * "getreg()" function
 */
    static void
f_getreg(typval_T *argvars, typval_T *rettv)
{
    char_u	*strregname;
    int		regname;
    int		arg2 = FALSE;
    int		return_list = FALSE;
    int		error = FALSE;

    if (argvars[0].v_type != VAR_UNKNOWN)
    {
	strregname = get_tv_string_chk(&argvars[0]);
	error = strregname == NULL;
	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    arg2 = get_tv_number_chk(&argvars[1], &error);
	    if (!error && argvars[2].v_type != VAR_UNKNOWN)
		return_list = get_tv_number_chk(&argvars[2], &error);
	}
    }
    else
	strregname = vimvars[VV_REG].vv_str;

    if (error)
	return;

    regname = (strregname == NULL ? '"' : *strregname);
    if (regname == 0)
	regname = '"';

    if (return_list)
    {
	rettv->v_type = VAR_LIST;
	rettv->vval.v_list = (list_T *)get_reg_contents(regname,
				      (arg2 ? GREG_EXPR_SRC : 0) | GREG_LIST);
	if (rettv->vval.v_list != NULL)
	    ++rettv->vval.v_list->lv_refcount;
    }
    else
    {
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = get_reg_contents(regname,
						    arg2 ? GREG_EXPR_SRC : 0);
    }
}

/*
 * "getregtype()" function
 */
    static void
f_getregtype(typval_T *argvars, typval_T *rettv)
{
    char_u	*strregname;
    int		regname;
    char_u	buf[NUMBUFLEN + 2];
    long	reglen = 0;

    if (argvars[0].v_type != VAR_UNKNOWN)
    {
	strregname = get_tv_string_chk(&argvars[0]);
	if (strregname == NULL)	    /* type error; errmsg already given */
	{
	    rettv->v_type = VAR_STRING;
	    rettv->vval.v_string = NULL;
	    return;
	}
    }
    else
	/* Default to v:register */
	strregname = vimvars[VV_REG].vv_str;

    regname = (strregname == NULL ? '"' : *strregname);
    if (regname == 0)
	regname = '"';

    buf[0] = NUL;
    buf[1] = NUL;
    switch (get_reg_type(regname, &reglen))
    {
	case MLINE: buf[0] = 'V'; break;
	case MCHAR: buf[0] = 'v'; break;
	case MBLOCK:
		buf[0] = Ctrl_V;
		sprintf((char *)buf + 1, "%ld", reglen + 1);
		break;
    }
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strsave(buf);
}

/*
 * "gettabvar()" function
 */
    static void
f_gettabvar(typval_T *argvars, typval_T *rettv)
{
    win_T	*oldcurwin;
    tabpage_T	*tp, *oldtabpage;
    dictitem_T	*v;
    char_u	*varname;
    int		done = FALSE;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    varname = get_tv_string_chk(&argvars[1]);
    tp = find_tabpage((int)get_tv_number_chk(&argvars[0], NULL));
    if (tp != NULL && varname != NULL)
    {
	/* Set tp to be our tabpage, temporarily.  Also set the window to the
	 * first window in the tabpage, otherwise the window is not valid. */
	if (switch_win(&oldcurwin, &oldtabpage,
		    tp->tp_firstwin == NULL ? firstwin : tp->tp_firstwin, tp, TRUE)
									== OK)
	{
	    /* look up the variable */
	    /* Let gettabvar({nr}, "") return the "t:" dictionary. */
	    v = find_var_in_ht(&tp->tp_vars->dv_hashtab, 't', varname, FALSE);
	    if (v != NULL)
	    {
		copy_tv(&v->di_tv, rettv);
		done = TRUE;
	    }
	}

	/* restore previous notion of curwin */
	restore_win(oldcurwin, oldtabpage, TRUE);
    }

    if (!done && argvars[2].v_type != VAR_UNKNOWN)
	copy_tv(&argvars[2], rettv);
}

/*
 * "gettabwinvar()" function
 */
    static void
f_gettabwinvar(typval_T *argvars, typval_T *rettv)
{
    getwinvar(argvars, rettv, 1);
}

/*
 * "getwinposx()" function
 */
    static void
f_getwinposx(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = -1;
#ifdef FEAT_GUI
    if (gui.in_use)
    {
	int	    x, y;

	if (gui_mch_get_winpos(&x, &y) == OK)
	    rettv->vval.v_number = x;
    }
#endif
}

/*
 * "getwinposy()" function
 */
    static void
f_getwinposy(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = -1;
#ifdef FEAT_GUI
    if (gui.in_use)
    {
	int	    x, y;

	if (gui_mch_get_winpos(&x, &y) == OK)
	    rettv->vval.v_number = y;
    }
#endif
}

/*
 * Find window specified by "vp" in tabpage "tp".
 */
    static win_T *
find_win_by_nr(
    typval_T	*vp,
    tabpage_T	*tp UNUSED)	/* NULL for current tab page */
{
#ifdef FEAT_WINDOWS
    win_T	*wp;
#endif
    int		nr;

    nr = get_tv_number_chk(vp, NULL);

#ifdef FEAT_WINDOWS
    if (nr < 0)
	return NULL;
    if (nr == 0)
	return curwin;

    for (wp = (tp == NULL || tp == curtab) ? firstwin : tp->tp_firstwin;
						  wp != NULL; wp = wp->w_next)
	if (--nr <= 0)
	    break;
    return wp;
#else
    if (nr == 0 || nr == 1)
	return curwin;
    return NULL;
#endif
}

/*
 * Find window specified by "wvp" in tabpage "tvp".
 */
    static win_T *
find_tabwin(
    typval_T	*wvp,	/* VAR_UNKNOWN for current window */
    typval_T	*tvp)	/* VAR_UNKNOWN for current tab page */
{
    win_T	*wp = NULL;
    tabpage_T	*tp = NULL;
    long	n;

    if (wvp->v_type != VAR_UNKNOWN)
    {
	if (tvp->v_type != VAR_UNKNOWN)
	{
	    n = get_tv_number(tvp);
	    if (n >= 0)
		tp = find_tabpage(n);
	}
	else
	    tp = curtab;

	if (tp != NULL)
	    wp = find_win_by_nr(wvp, tp);
    }
    else
	wp = curwin;

    return wp;
}

/*
 * "getwinvar()" function
 */
    static void
f_getwinvar(typval_T *argvars, typval_T *rettv)
{
    getwinvar(argvars, rettv, 0);
}

/*
 * getwinvar() and gettabwinvar()
 */
    static void
getwinvar(
    typval_T	*argvars,
    typval_T	*rettv,
    int		off)	    /* 1 for gettabwinvar() */
{
    win_T	*win;
    char_u	*varname;
    dictitem_T	*v;
    tabpage_T	*tp = NULL;
    int		done = FALSE;
#ifdef FEAT_WINDOWS
    win_T	*oldcurwin;
    tabpage_T	*oldtabpage;
    int		need_switch_win;
#endif

#ifdef FEAT_WINDOWS
    if (off == 1)
	tp = find_tabpage((int)get_tv_number_chk(&argvars[0], NULL));
    else
	tp = curtab;
#endif
    win = find_win_by_nr(&argvars[off], tp);
    varname = get_tv_string_chk(&argvars[off + 1]);
    ++emsg_off;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    if (win != NULL && varname != NULL)
    {
#ifdef FEAT_WINDOWS
	/* Set curwin to be our win, temporarily.  Also set the tabpage,
	 * otherwise the window is not valid. Only do this when needed,
	 * autocommands get blocked. */
	need_switch_win = !(tp == curtab && win == curwin);
	if (!need_switch_win
		  || switch_win(&oldcurwin, &oldtabpage, win, tp, TRUE) == OK)
#endif
	{
	    if (*varname == '&')	/* window-local-option */
	    {
		if (get_option_tv(&varname, rettv, 1) == OK)
		    done = TRUE;
	    }
	    else
	    {
		/* Look up the variable. */
		/* Let getwinvar({nr}, "") return the "w:" dictionary. */
		v = find_var_in_ht(&win->w_vars->dv_hashtab, 'w',
							      varname, FALSE);
		if (v != NULL)
		{
		    copy_tv(&v->di_tv, rettv);
		    done = TRUE;
		}
	    }
	}

#ifdef FEAT_WINDOWS
	if (need_switch_win)
	    /* restore previous notion of curwin */
	    restore_win(oldcurwin, oldtabpage, TRUE);
#endif
    }

    if (!done && argvars[off + 2].v_type != VAR_UNKNOWN)
	/* use the default return value */
	copy_tv(&argvars[off + 2], rettv);

    --emsg_off;
}

/*
 * "glob()" function
 */
    static void
f_glob(typval_T *argvars, typval_T *rettv)
{
    int		options = WILD_SILENT|WILD_USE_NL;
    expand_T	xpc;
    int		error = FALSE;

    /* When the optional second argument is non-zero, don't remove matches
     * for 'wildignore' and don't put matches for 'suffixes' at the end. */
    rettv->v_type = VAR_STRING;
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	if (get_tv_number_chk(&argvars[1], &error))
	    options |= WILD_KEEP_ALL;
	if (argvars[2].v_type != VAR_UNKNOWN)
	{
	    if (get_tv_number_chk(&argvars[2], &error))
	    {
		rettv->v_type = VAR_LIST;
		rettv->vval.v_list = NULL;
	    }
	    if (argvars[3].v_type != VAR_UNKNOWN
				    && get_tv_number_chk(&argvars[3], &error))
		options |= WILD_ALLLINKS;
	}
    }
    if (!error)
    {
	ExpandInit(&xpc);
	xpc.xp_context = EXPAND_FILES;
	if (p_wic)
	    options += WILD_ICASE;
	if (rettv->v_type == VAR_STRING)
	    rettv->vval.v_string = ExpandOne(&xpc, get_tv_string(&argvars[0]),
						     NULL, options, WILD_ALL);
	else if (rettv_list_alloc(rettv) != FAIL)
	{
	  int i;

	  ExpandOne(&xpc, get_tv_string(&argvars[0]),
						NULL, options, WILD_ALL_KEEP);
	  for (i = 0; i < xpc.xp_numfiles; i++)
	      list_append_string(rettv->vval.v_list, xpc.xp_files[i], -1);

	  ExpandCleanup(&xpc);
	}
    }
    else
	rettv->vval.v_string = NULL;
}

/*
 * "globpath()" function
 */
    static void
f_globpath(typval_T *argvars, typval_T *rettv)
{
    int		flags = 0;
    char_u	buf1[NUMBUFLEN];
    char_u	*file = get_tv_string_buf_chk(&argvars[1], buf1);
    int		error = FALSE;
    garray_T	ga;
    int		i;

    /* When the optional second argument is non-zero, don't remove matches
    * for 'wildignore' and don't put matches for 'suffixes' at the end. */
    rettv->v_type = VAR_STRING;
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	if (get_tv_number_chk(&argvars[2], &error))
	    flags |= WILD_KEEP_ALL;
	if (argvars[3].v_type != VAR_UNKNOWN)
	{
	    if (get_tv_number_chk(&argvars[3], &error))
	    {
		rettv->v_type = VAR_LIST;
		rettv->vval.v_list = NULL;
	    }
	    if (argvars[4].v_type != VAR_UNKNOWN
				    && get_tv_number_chk(&argvars[4], &error))
		flags |= WILD_ALLLINKS;
	}
    }
    if (file != NULL && !error)
    {
	ga_init2(&ga, (int)sizeof(char_u *), 10);
	globpath(get_tv_string(&argvars[0]), file, &ga, flags);
	if (rettv->v_type == VAR_STRING)
	    rettv->vval.v_string = ga_concat_strings(&ga, "\n");
	else if (rettv_list_alloc(rettv) != FAIL)
	    for (i = 0; i < ga.ga_len; ++i)
		list_append_string(rettv->vval.v_list,
					    ((char_u **)(ga.ga_data))[i], -1);
	ga_clear_strings(&ga);
    }
    else
	rettv->vval.v_string = NULL;
}

/*
 * "glob2regpat()" function
 */
    static void
f_glob2regpat(typval_T *argvars, typval_T *rettv)
{
    char_u	*pat = get_tv_string_chk(&argvars[0]);

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = (pat == NULL)
			 ? NULL : file_pat_to_reg_pat(pat, NULL, NULL, FALSE);
}

/*
 * "has()" function
 */
    static void
f_has(typval_T *argvars, typval_T *rettv)
{
    int		i;
    char_u	*name;
    int		n = FALSE;
    static char	*(has_list[]) =
    {
#ifdef AMIGA
	"amiga",
# ifdef FEAT_ARP
	"arp",
# endif
#endif
#ifdef __BEOS__
	"beos",
#endif
#ifdef MSDOS
# ifdef DJGPP
	"dos32",
# else
	"dos16",
# endif
#endif
#ifdef MACOS
	"mac",
#endif
#if defined(MACOS_X_UNIX)
	"macunix",
#endif
#ifdef __QNX__
	"qnx",
#endif
#ifdef UNIX
	"unix",
#endif
#ifdef VMS
	"vms",
#endif
#ifdef WIN16
	"win16",
#endif
#ifdef WIN32
	"win32",
#endif
#if defined(UNIX) && (defined(__CYGWIN32__) || defined(__CYGWIN__))
	"win32unix",
#endif
#if defined(WIN64) || defined(_WIN64)
	"win64",
#endif
#ifdef EBCDIC
	"ebcdic",
#endif
#ifndef CASE_INSENSITIVE_FILENAME
	"fname_case",
#endif
#ifdef HAVE_ACL
	"acl",
#endif
#ifdef FEAT_ARABIC
	"arabic",
#endif
#ifdef FEAT_AUTOCMD
	"autocmd",
#endif
#ifdef FEAT_BEVAL
	"balloon_eval",
# ifndef FEAT_GUI_W32 /* other GUIs always have multiline balloons */
	"balloon_multiline",
# endif
#endif
#if defined(SOME_BUILTIN_TCAPS) || defined(ALL_BUILTIN_TCAPS)
	"builtin_terms",
# ifdef ALL_BUILTIN_TCAPS
	"all_builtin_terms",
# endif
#endif
#if defined(FEAT_BROWSE) && (defined(USE_FILE_CHOOSER) \
	|| defined(FEAT_GUI_W32) \
	|| defined(FEAT_GUI_MOTIF))
	"browsefilter",
#endif
#ifdef FEAT_BYTEOFF
	"byte_offset",
#endif
#ifdef FEAT_CHANNEL
	"channel",
#endif
#ifdef FEAT_CINDENT
	"cindent",
#endif
#ifdef FEAT_CLIENTSERVER
	"clientserver",
#endif
#ifdef FEAT_CLIPBOARD
	"clipboard",
#endif
#ifdef FEAT_CMDL_COMPL
	"cmdline_compl",
#endif
#ifdef FEAT_CMDHIST
	"cmdline_hist",
#endif
#ifdef FEAT_COMMENTS
	"comments",
#endif
#ifdef FEAT_CONCEAL
	"conceal",
#endif
#ifdef FEAT_CRYPT
	"cryptv",
	"crypt-blowfish",
	"crypt-blowfish2",
#endif
#ifdef FEAT_CSCOPE
	"cscope",
#endif
#ifdef FEAT_CURSORBIND
	"cursorbind",
#endif
#ifdef CURSOR_SHAPE
	"cursorshape",
#endif
#ifdef DEBUG
	"debug",
#endif
#ifdef FEAT_CON_DIALOG
	"dialog_con",
#endif
#ifdef FEAT_GUI_DIALOG
	"dialog_gui",
#endif
#ifdef FEAT_DIFF
	"diff",
#endif
#ifdef FEAT_DIGRAPHS
	"digraphs",
#endif
#ifdef FEAT_DIRECTX
	"directx",
#endif
#ifdef FEAT_DND
	"dnd",
#endif
#ifdef FEAT_EMACS_TAGS
	"emacs_tags",
#endif
	"eval",	    /* always present, of course! */
	"ex_extra", /* graduated feature */
#ifdef FEAT_SEARCH_EXTRA
	"extra_search",
#endif
#ifdef FEAT_FKMAP
	"farsi",
#endif
#ifdef FEAT_SEARCHPATH
	"file_in_path",
#endif
#ifdef FEAT_FILTERPIPE
	"filterpipe",
#endif
#ifdef FEAT_FIND_ID
	"find_in_path",
#endif
#ifdef FEAT_FLOAT
	"float",
#endif
#ifdef FEAT_FOLDING
	"folding",
#endif
#ifdef FEAT_FOOTER
	"footer",
#endif
#if !defined(USE_SYSTEM) && defined(UNIX)
	"fork",
#endif
#ifdef FEAT_GETTEXT
	"gettext",
#endif
#ifdef FEAT_GUI
	"gui",
#endif
#ifdef FEAT_GUI_ATHENA
# ifdef FEAT_GUI_NEXTAW
	"gui_neXtaw",
# else
	"gui_athena",
# endif
#endif
#ifdef FEAT_GUI_GTK
	"gui_gtk",
	"gui_gtk2",
#endif
#ifdef FEAT_GUI_GNOME
	"gui_gnome",
#endif
#ifdef FEAT_GUI_MAC
	"gui_mac",
#endif
#ifdef FEAT_GUI_MOTIF
	"gui_motif",
#endif
#ifdef FEAT_GUI_PHOTON
	"gui_photon",
#endif
#ifdef FEAT_GUI_W16
	"gui_win16",
#endif
#ifdef FEAT_GUI_W32
	"gui_win32",
#endif
#ifdef FEAT_HANGULIN
	"hangul_input",
#endif
#if defined(HAVE_ICONV_H) && defined(USE_ICONV)
	"iconv",
#endif
#ifdef FEAT_INS_EXPAND
	"insert_expand",
#endif
#ifdef FEAT_JUMPLIST
	"jumplist",
#endif
#ifdef FEAT_KEYMAP
	"keymap",
#endif
#ifdef FEAT_LANGMAP
	"langmap",
#endif
#ifdef FEAT_LIBCALL
	"libcall",
#endif
#ifdef FEAT_LINEBREAK
	"linebreak",
#endif
#ifdef FEAT_LISP
	"lispindent",
#endif
#ifdef FEAT_LISTCMDS
	"listcmds",
#endif
#ifdef FEAT_LOCALMAP
	"localmap",
#endif
#ifdef FEAT_LUA
# ifndef DYNAMIC_LUA
	"lua",
# endif
#endif
#ifdef FEAT_MENU
	"menu",
#endif
#ifdef FEAT_SESSION
	"mksession",
#endif
#ifdef FEAT_MODIFY_FNAME
	"modify_fname",
#endif
#ifdef FEAT_MOUSE
	"mouse",
#endif
#ifdef FEAT_MOUSESHAPE
	"mouseshape",
#endif
#if defined(UNIX) || defined(VMS)
# ifdef FEAT_MOUSE_DEC
	"mouse_dec",
# endif
# ifdef FEAT_MOUSE_GPM
	"mouse_gpm",
# endif
# ifdef FEAT_MOUSE_JSB
	"mouse_jsbterm",
# endif
# ifdef FEAT_MOUSE_NET
	"mouse_netterm",
# endif
# ifdef FEAT_MOUSE_PTERM
	"mouse_pterm",
# endif
# ifdef FEAT_MOUSE_SGR
	"mouse_sgr",
# endif
# ifdef FEAT_SYSMOUSE
	"mouse_sysmouse",
# endif
# ifdef FEAT_MOUSE_URXVT
	"mouse_urxvt",
# endif
# ifdef FEAT_MOUSE_XTERM
	"mouse_xterm",
# endif
#endif
#ifdef FEAT_MBYTE
	"multi_byte",
#endif
#ifdef FEAT_MBYTE_IME
	"multi_byte_ime",
#endif
#ifdef FEAT_MULTI_LANG
	"multi_lang",
#endif
#ifdef FEAT_MZSCHEME
#ifndef DYNAMIC_MZSCHEME
	"mzscheme",
#endif
#endif
#ifdef FEAT_OLE
	"ole",
#endif
#ifdef FEAT_PATH_EXTRA
	"path_extra",
#endif
#ifdef FEAT_PERL
#ifndef DYNAMIC_PERL
	"perl",
#endif
#endif
#ifdef FEAT_PERSISTENT_UNDO
	"persistent_undo",
#endif
#ifdef FEAT_PYTHON
#ifndef DYNAMIC_PYTHON
	"python",
#endif
#endif
#ifdef FEAT_PYTHON3
#ifndef DYNAMIC_PYTHON3
	"python3",
#endif
#endif
#ifdef FEAT_POSTSCRIPT
	"postscript",
#endif
#ifdef FEAT_PRINTER
	"printer",
#endif
#ifdef FEAT_PROFILE
	"profile",
#endif
#ifdef FEAT_RELTIME
	"reltime",
#endif
#ifdef FEAT_QUICKFIX
	"quickfix",
#endif
#ifdef FEAT_RIGHTLEFT
	"rightleft",
#endif
#if defined(FEAT_RUBY) && !defined(DYNAMIC_RUBY)
	"ruby",
#endif
#ifdef FEAT_SCROLLBIND
	"scrollbind",
#endif
#ifdef FEAT_CMDL_INFO
	"showcmd",
	"cmdline_info",
#endif
#ifdef FEAT_SIGNS
	"signs",
#endif
#ifdef FEAT_SMARTINDENT
	"smartindent",
#endif
#ifdef FEAT_SNIFF
	"sniff",
#endif
#ifdef STARTUPTIME
	"startuptime",
#endif
#ifdef FEAT_STL_OPT
	"statusline",
#endif
#ifdef FEAT_SUN_WORKSHOP
	"sun_workshop",
#endif
#ifdef FEAT_NETBEANS_INTG
	"netbeans_intg",
#endif
#ifdef FEAT_SPELL
	"spell",
#endif
#ifdef FEAT_SYN_HL
	"syntax",
#endif
#if defined(USE_SYSTEM) || !defined(UNIX)
	"system",
#endif
#ifdef FEAT_TAG_BINS
	"tag_binary",
#endif
#ifdef FEAT_TAG_OLDSTATIC
	"tag_old_static",
#endif
#ifdef FEAT_TAG_ANYWHITE
	"tag_any_white",
#endif
#ifdef FEAT_TCL
# ifndef DYNAMIC_TCL
	"tcl",
# endif
#endif
#ifdef TERMINFO
	"terminfo",
#endif
#ifdef FEAT_TERMRESPONSE
	"termresponse",
#endif
#ifdef FEAT_TEXTOBJ
	"textobjects",
#endif
#ifdef HAVE_TGETENT
	"tgetent",
#endif
#ifdef FEAT_TITLE
	"title",
#endif
#ifdef FEAT_TOOLBAR
	"toolbar",
#endif
#if defined(FEAT_CLIPBOARD) && defined(FEAT_X11)
	"unnamedplus",
#endif
#ifdef FEAT_USR_CMDS
	"user-commands",    /* was accidentally included in 5.4 */
	"user_commands",
#endif
#ifdef FEAT_VIMINFO
	"viminfo",
#endif
#ifdef FEAT_VERTSPLIT
	"vertsplit",
#endif
#ifdef FEAT_VIRTUALEDIT
	"virtualedit",
#endif
	"visual",
#ifdef FEAT_VISUALEXTRA
	"visualextra",
#endif
#ifdef FEAT_VREPLACE
	"vreplace",
#endif
#ifdef FEAT_WILDIGN
	"wildignore",
#endif
#ifdef FEAT_WILDMENU
	"wildmenu",
#endif
#ifdef FEAT_WINDOWS
	"windows",
#endif
#ifdef FEAT_WAK
	"winaltkeys",
#endif
#ifdef FEAT_WRITEBACKUP
	"writebackup",
#endif
#ifdef FEAT_XIM
	"xim",
#endif
#ifdef FEAT_XFONTSET
	"xfontset",
#endif
#ifdef FEAT_XPM_W32
	"xpm",
	"xpm_w32",	/* for backward compatibility */
#else
# if defined(HAVE_XPM)
	"xpm",
# endif
#endif
#ifdef USE_XSMP
	"xsmp",
#endif
#ifdef USE_XSMP_INTERACT
	"xsmp_interact",
#endif
#ifdef FEAT_XCLIPBOARD
	"xterm_clipboard",
#endif
#ifdef FEAT_XTERM_SAVE
	"xterm_save",
#endif
#if defined(UNIX) && defined(FEAT_X11)
	"X11",
#endif
	NULL
    };

    name = get_tv_string(&argvars[0]);
    for (i = 0; has_list[i] != NULL; ++i)
	if (STRICMP(name, has_list[i]) == 0)
	{
	    n = TRUE;
	    break;
	}

    if (n == FALSE)
    {
	if (STRNICMP(name, "patch", 5) == 0)
	{
	    if (name[5] == '-'
		    && STRLEN(name) > 11
		    && vim_isdigit(name[6])
		    && vim_isdigit(name[8])
		    && vim_isdigit(name[10]))
	    {
		int major = atoi((char *)name + 6);
		int minor = atoi((char *)name + 8);

		/* Expect "patch-9.9.01234". */
		n = (major < VIM_VERSION_MAJOR
		     || (major == VIM_VERSION_MAJOR
			 && (minor < VIM_VERSION_MINOR
			     || (minor == VIM_VERSION_MINOR
				 && has_patch(atoi((char *)name + 10))))));
	    }
	    else
		n = has_patch(atoi((char *)name + 5));
	}
	else if (STRICMP(name, "vim_starting") == 0)
	    n = (starting != 0);
#ifdef FEAT_MBYTE
	else if (STRICMP(name, "multi_byte_encoding") == 0)
	    n = has_mbyte;
#endif
#if defined(FEAT_BEVAL) && defined(FEAT_GUI_W32)
	else if (STRICMP(name, "balloon_multiline") == 0)
	    n = multiline_balloon_available();
#endif
#ifdef DYNAMIC_TCL
	else if (STRICMP(name, "tcl") == 0)
	    n = tcl_enabled(FALSE);
#endif
#if defined(USE_ICONV) && defined(DYNAMIC_ICONV)
	else if (STRICMP(name, "iconv") == 0)
	    n = iconv_enabled(FALSE);
#endif
#ifdef DYNAMIC_LUA
	else if (STRICMP(name, "lua") == 0)
	    n = lua_enabled(FALSE);
#endif
#ifdef DYNAMIC_MZSCHEME
	else if (STRICMP(name, "mzscheme") == 0)
	    n = mzscheme_enabled(FALSE);
#endif
#ifdef DYNAMIC_RUBY
	else if (STRICMP(name, "ruby") == 0)
	    n = ruby_enabled(FALSE);
#endif
#ifdef FEAT_PYTHON
#ifdef DYNAMIC_PYTHON
	else if (STRICMP(name, "python") == 0)
	    n = python_enabled(FALSE);
#endif
#endif
#ifdef FEAT_PYTHON3
#ifdef DYNAMIC_PYTHON3
	else if (STRICMP(name, "python3") == 0)
	    n = python3_enabled(FALSE);
#endif
#endif
#ifdef DYNAMIC_PERL
	else if (STRICMP(name, "perl") == 0)
	    n = perl_enabled(FALSE);
#endif
#ifdef FEAT_GUI
	else if (STRICMP(name, "gui_running") == 0)
	    n = (gui.in_use || gui.starting);
# ifdef FEAT_GUI_W32
	else if (STRICMP(name, "gui_win32s") == 0)
	    n = gui_is_win32s();
# endif
# ifdef FEAT_BROWSE
	else if (STRICMP(name, "browse") == 0)
	    n = gui.in_use;	/* gui_mch_browse() works when GUI is running */
# endif
#endif
#ifdef FEAT_SYN_HL
	else if (STRICMP(name, "syntax_items") == 0)
	    n = syntax_present(curwin);
#endif
#if defined(WIN3264)
	else if (STRICMP(name, "win95") == 0)
	    n = mch_windows95();
#endif
#ifdef FEAT_NETBEANS_INTG
	else if (STRICMP(name, "netbeans_enabled") == 0)
	    n = netbeans_active();
#endif
    }

    rettv->vval.v_number = n;
}

/*
 * "has_key()" function
 */
    static void
f_has_key(typval_T *argvars, typval_T *rettv)
{
    if (argvars[0].v_type != VAR_DICT)
    {
	EMSG(_(e_dictreq));
	return;
    }
    if (argvars[0].vval.v_dict == NULL)
	return;

    rettv->vval.v_number = dict_find(argvars[0].vval.v_dict,
				      get_tv_string(&argvars[1]), -1) != NULL;
}

/*
 * "haslocaldir()" function
 */
    static void
f_haslocaldir(typval_T *argvars, typval_T *rettv)
{
    win_T	*wp = NULL;

    wp = find_tabwin(&argvars[0], &argvars[1]);
    rettv->vval.v_number = (wp != NULL && wp->w_localdir != NULL);
}

/*
 * "hasmapto()" function
 */
    static void
f_hasmapto(typval_T *argvars, typval_T *rettv)
{
    char_u	*name;
    char_u	*mode;
    char_u	buf[NUMBUFLEN];
    int		abbr = FALSE;

    name = get_tv_string(&argvars[0]);
    if (argvars[1].v_type == VAR_UNKNOWN)
	mode = (char_u *)"nvo";
    else
    {
	mode = get_tv_string_buf(&argvars[1], buf);
	if (argvars[2].v_type != VAR_UNKNOWN)
	    abbr = get_tv_number(&argvars[2]);
    }

    if (map_to_exists(name, mode, abbr))
	rettv->vval.v_number = TRUE;
    else
	rettv->vval.v_number = FALSE;
}

/*
 * "histadd()" function
 */
    static void
f_histadd(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CMDHIST
    int		histype;
    char_u	*str;
    char_u	buf[NUMBUFLEN];
#endif

    rettv->vval.v_number = FALSE;
    if (check_restricted() || check_secure())
	return;
#ifdef FEAT_CMDHIST
    str = get_tv_string_chk(&argvars[0]);	/* NULL on type error */
    histype = str != NULL ? get_histtype(str) : -1;
    if (histype >= 0)
    {
	str = get_tv_string_buf(&argvars[1], buf);
	if (*str != NUL)
	{
	    init_history();
	    add_to_history(histype, str, FALSE, NUL);
	    rettv->vval.v_number = TRUE;
	    return;
	}
    }
#endif
}

/*
 * "histdel()" function
 */
    static void
f_histdel(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CMDHIST
    int		n;
    char_u	buf[NUMBUFLEN];
    char_u	*str;

    str = get_tv_string_chk(&argvars[0]);	/* NULL on type error */
    if (str == NULL)
	n = 0;
    else if (argvars[1].v_type == VAR_UNKNOWN)
	/* only one argument: clear entire history */
	n = clr_history(get_histtype(str));
    else if (argvars[1].v_type == VAR_NUMBER)
	/* index given: remove that entry */
	n = del_history_idx(get_histtype(str),
					  (int)get_tv_number(&argvars[1]));
    else
	/* string given: remove all matching entries */
	n = del_history_entry(get_histtype(str),
				      get_tv_string_buf(&argvars[1], buf));
    rettv->vval.v_number = n;
#endif
}

/*
 * "histget()" function
 */
    static void
f_histget(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CMDHIST
    int		type;
    int		idx;
    char_u	*str;

    str = get_tv_string_chk(&argvars[0]);	/* NULL on type error */
    if (str == NULL)
	rettv->vval.v_string = NULL;
    else
    {
	type = get_histtype(str);
	if (argvars[1].v_type == VAR_UNKNOWN)
	    idx = get_history_idx(type);
	else
	    idx = (int)get_tv_number_chk(&argvars[1], NULL);
						    /* -1 on type error */
	rettv->vval.v_string = vim_strsave(get_history_entry(type, idx));
    }
#else
    rettv->vval.v_string = NULL;
#endif
    rettv->v_type = VAR_STRING;
}

/*
 * "histnr()" function
 */
    static void
f_histnr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		i;

#ifdef FEAT_CMDHIST
    char_u	*history = get_tv_string_chk(&argvars[0]);

    i = history == NULL ? HIST_CMD - 1 : get_histtype(history);
    if (i >= HIST_CMD && i < HIST_COUNT)
	i = get_history_idx(i);
    else
#endif
	i = -1;
    rettv->vval.v_number = i;
}

/*
 * "highlightID(name)" function
 */
    static void
f_hlID(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = syn_name2id(get_tv_string(&argvars[0]));
}

/*
 * "highlight_exists()" function
 */
    static void
f_hlexists(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = highlight_exists(get_tv_string(&argvars[0]));
}

/*
 * "hostname()" function
 */
    static void
f_hostname(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u hostname[256];

    mch_get_host_name(hostname, 256);
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strsave(hostname);
}

/*
 * iconv() function
 */
    static void
f_iconv(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_MBYTE
    char_u	buf1[NUMBUFLEN];
    char_u	buf2[NUMBUFLEN];
    char_u	*from, *to, *str;
    vimconv_T	vimconv;
#endif

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

#ifdef FEAT_MBYTE
    str = get_tv_string(&argvars[0]);
    from = enc_canonize(enc_skip(get_tv_string_buf(&argvars[1], buf1)));
    to = enc_canonize(enc_skip(get_tv_string_buf(&argvars[2], buf2)));
    vimconv.vc_type = CONV_NONE;
    convert_setup(&vimconv, from, to);

    /* If the encodings are equal, no conversion needed. */
    if (vimconv.vc_type == CONV_NONE)
	rettv->vval.v_string = vim_strsave(str);
    else
	rettv->vval.v_string = string_convert(&vimconv, str, NULL);

    convert_setup(&vimconv, NULL, NULL);
    vim_free(from);
    vim_free(to);
#endif
}

/*
 * "indent()" function
 */
    static void
f_indent(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;

    lnum = get_tv_lnum(argvars);
    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
	rettv->vval.v_number = get_indent_lnum(lnum);
    else
	rettv->vval.v_number = -1;
}

/*
 * "index()" function
 */
    static void
f_index(typval_T *argvars, typval_T *rettv)
{
    list_T	*l;
    listitem_T	*item;
    long	idx = 0;
    int		ic = FALSE;

    rettv->vval.v_number = -1;
    if (argvars[0].v_type != VAR_LIST)
    {
	EMSG(_(e_listreq));
	return;
    }
    l = argvars[0].vval.v_list;
    if (l != NULL)
    {
	item = l->lv_first;
	if (argvars[2].v_type != VAR_UNKNOWN)
	{
	    int		error = FALSE;

	    /* Start at specified item.  Use the cached index that list_find()
	     * sets, so that a negative number also works. */
	    item = list_find(l, get_tv_number_chk(&argvars[2], &error));
	    idx = l->lv_idx;
	    if (argvars[3].v_type != VAR_UNKNOWN)
		ic = get_tv_number_chk(&argvars[3], &error);
	    if (error)
		item = NULL;
	}

	for ( ; item != NULL; item = item->li_next, ++idx)
	    if (tv_equal(&item->li_tv, &argvars[1], ic, FALSE))
	    {
		rettv->vval.v_number = idx;
		break;
	    }
    }
}

static int inputsecret_flag = 0;

static void get_user_input(typval_T *argvars, typval_T *rettv, int inputdialog);

/*
 * This function is used by f_input() and f_inputdialog() functions. The third
 * argument to f_input() specifies the type of completion to use at the
 * prompt. The third argument to f_inputdialog() specifies the value to return
 * when the user cancels the prompt.
 */
    static void
get_user_input(
    typval_T	*argvars,
    typval_T	*rettv,
    int		inputdialog)
{
    char_u	*prompt = get_tv_string_chk(&argvars[0]);
    char_u	*p = NULL;
    int		c;
    char_u	buf[NUMBUFLEN];
    int		cmd_silent_save = cmd_silent;
    char_u	*defstr = (char_u *)"";
    int		xp_type = EXPAND_NOTHING;
    char_u	*xp_arg = NULL;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

#ifdef NO_CONSOLE_INPUT
    /* While starting up, there is no place to enter text. */
    if (no_console_input())
	return;
#endif

    cmd_silent = FALSE;		/* Want to see the prompt. */
    if (prompt != NULL)
    {
	/* Only the part of the message after the last NL is considered as
	 * prompt for the command line */
	p = vim_strrchr(prompt, '\n');
	if (p == NULL)
	    p = prompt;
	else
	{
	    ++p;
	    c = *p;
	    *p = NUL;
	    msg_start();
	    msg_clr_eos();
	    msg_puts_attr(prompt, echo_attr);
	    msg_didout = FALSE;
	    msg_starthere();
	    *p = c;
	}
	cmdline_row = msg_row;

	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    defstr = get_tv_string_buf_chk(&argvars[1], buf);
	    if (defstr != NULL)
		stuffReadbuffSpec(defstr);

	    if (!inputdialog && argvars[2].v_type != VAR_UNKNOWN)
	    {
		char_u	*xp_name;
		int	xp_namelen;
		long	argt;

		/* input() with a third argument: completion */
		rettv->vval.v_string = NULL;

		xp_name = get_tv_string_buf_chk(&argvars[2], buf);
		if (xp_name == NULL)
		    return;

		xp_namelen = (int)STRLEN(xp_name);

		if (parse_compl_arg(xp_name, xp_namelen, &xp_type, &argt,
							     &xp_arg) == FAIL)
		    return;
	    }
	}

	if (defstr != NULL)
	{
	    int save_ex_normal_busy = ex_normal_busy;
	    ex_normal_busy = 0;
	    rettv->vval.v_string =
		getcmdline_prompt(inputsecret_flag ? NUL : '@', p, echo_attr,
				  xp_type, xp_arg);
	    ex_normal_busy = save_ex_normal_busy;
	}
	if (inputdialog && rettv->vval.v_string == NULL
		&& argvars[1].v_type != VAR_UNKNOWN
		&& argvars[2].v_type != VAR_UNKNOWN)
	    rettv->vval.v_string = vim_strsave(get_tv_string_buf(
							   &argvars[2], buf));

	vim_free(xp_arg);

	/* since the user typed this, no need to wait for return */
	need_wait_return = FALSE;
	msg_didout = FALSE;
    }
    cmd_silent = cmd_silent_save;
}

/*
 * "input()" function
 *     Also handles inputsecret() when inputsecret is set.
 */
    static void
f_input(typval_T *argvars, typval_T *rettv)
{
    get_user_input(argvars, rettv, FALSE);
}

/*
 * "inputdialog()" function
 */
    static void
f_inputdialog(typval_T *argvars, typval_T *rettv)
{
#if defined(FEAT_GUI_TEXTDIALOG)
    /* Use a GUI dialog if the GUI is running and 'c' is not in 'guioptions' */
    if (gui.in_use && vim_strchr(p_go, GO_CONDIALOG) == NULL)
    {
	char_u	*message;
	char_u	buf[NUMBUFLEN];
	char_u	*defstr = (char_u *)"";

	message = get_tv_string_chk(&argvars[0]);
	if (argvars[1].v_type != VAR_UNKNOWN
		&& (defstr = get_tv_string_buf_chk(&argvars[1], buf)) != NULL)
	    vim_strncpy(IObuff, defstr, IOSIZE - 1);
	else
	    IObuff[0] = NUL;
	if (message != NULL && defstr != NULL
		&& do_dialog(VIM_QUESTION, NULL, message,
			  (char_u *)_("&OK\n&Cancel"), 1, IObuff, FALSE) == 1)
	    rettv->vval.v_string = vim_strsave(IObuff);
	else
	{
	    if (message != NULL && defstr != NULL
					&& argvars[1].v_type != VAR_UNKNOWN
					&& argvars[2].v_type != VAR_UNKNOWN)
		rettv->vval.v_string = vim_strsave(
				      get_tv_string_buf(&argvars[2], buf));
	    else
		rettv->vval.v_string = NULL;
	}
	rettv->v_type = VAR_STRING;
    }
    else
#endif
	get_user_input(argvars, rettv, TRUE);
}

/*
 * "inputlist()" function
 */
    static void
f_inputlist(typval_T *argvars, typval_T *rettv)
{
    listitem_T	*li;
    int		selected;
    int		mouse_used;

#ifdef NO_CONSOLE_INPUT
    /* While starting up, there is no place to enter text. */
    if (no_console_input())
	return;
#endif
    if (argvars[0].v_type != VAR_LIST || argvars[0].vval.v_list == NULL)
    {
	EMSG2(_(e_listarg), "inputlist()");
	return;
    }

    msg_start();
    msg_row = Rows - 1;	/* for when 'cmdheight' > 1 */
    lines_left = Rows;	/* avoid more prompt */
    msg_scroll = TRUE;
    msg_clr_eos();

    for (li = argvars[0].vval.v_list->lv_first; li != NULL; li = li->li_next)
    {
	msg_puts(get_tv_string(&li->li_tv));
	msg_putchar('\n');
    }

    /* Ask for choice. */
    selected = prompt_for_number(&mouse_used);
    if (mouse_used)
	selected -= lines_left;

    rettv->vval.v_number = selected;
}


static garray_T	    ga_userinput = {0, 0, sizeof(tasave_T), 4, NULL};

/*
 * "inputrestore()" function
 */
    static void
f_inputrestore(typval_T *argvars UNUSED, typval_T *rettv)
{
    if (ga_userinput.ga_len > 0)
    {
	--ga_userinput.ga_len;
	restore_typeahead((tasave_T *)(ga_userinput.ga_data)
						       + ga_userinput.ga_len);
	/* default return is zero == OK */
    }
    else if (p_verbose > 1)
    {
	verb_msg((char_u *)_("called inputrestore() more often than inputsave()"));
	rettv->vval.v_number = 1; /* Failed */
    }
}

/*
 * "inputsave()" function
 */
    static void
f_inputsave(typval_T *argvars UNUSED, typval_T *rettv)
{
    /* Add an entry to the stack of typeahead storage. */
    if (ga_grow(&ga_userinput, 1) == OK)
    {
	save_typeahead((tasave_T *)(ga_userinput.ga_data)
						       + ga_userinput.ga_len);
	++ga_userinput.ga_len;
	/* default return is zero == OK */
    }
    else
	rettv->vval.v_number = 1; /* Failed */
}

/*
 * "inputsecret()" function
 */
    static void
f_inputsecret(typval_T *argvars, typval_T *rettv)
{
    ++cmdline_star;
    ++inputsecret_flag;
    f_input(argvars, rettv);
    --cmdline_star;
    --inputsecret_flag;
}

/*
 * "insert()" function
 */
    static void
f_insert(typval_T *argvars, typval_T *rettv)
{
    long	before = 0;
    listitem_T	*item;
    list_T	*l;
    int		error = FALSE;

    if (argvars[0].v_type != VAR_LIST)
	EMSG2(_(e_listarg), "insert()");
    else if ((l = argvars[0].vval.v_list) != NULL
	    && !tv_check_lock(l->lv_lock, (char_u *)N_("insert() argument"), TRUE))
    {
	if (argvars[2].v_type != VAR_UNKNOWN)
	    before = get_tv_number_chk(&argvars[2], &error);
	if (error)
	    return;		/* type error; errmsg already given */

	if (before == l->lv_len)
	    item = NULL;
	else
	{
	    item = list_find(l, before);
	    if (item == NULL)
	    {
		EMSGN(_(e_listidx), before);
		l = NULL;
	    }
	}
	if (l != NULL)
	{
	    list_insert_tv(l, &argvars[1], item);
	    copy_tv(&argvars[0], rettv);
	}
    }
}

/*
 * "invert(expr)" function
 */
    static void
f_invert(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = ~get_tv_number_chk(&argvars[0], NULL);
}

/*
 * "isdirectory()" function
 */
    static void
f_isdirectory(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = mch_isdir(get_tv_string(&argvars[0]));
}

/*
 * "islocked()" function
 */
    static void
f_islocked(typval_T *argvars, typval_T *rettv)
{
    lval_T	lv;
    char_u	*end;
    dictitem_T	*di;

    rettv->vval.v_number = -1;
    end = get_lval(get_tv_string(&argvars[0]), NULL, &lv, FALSE, FALSE,
					GLV_NO_AUTOLOAD, FNE_CHECK_START);
    if (end != NULL && lv.ll_name != NULL)
    {
	if (*end != NUL)
	    EMSG(_(e_trailing));
	else
	{
	    if (lv.ll_tv == NULL)
	    {
		if (check_changedtick(lv.ll_name))
		    rettv->vval.v_number = 1;	    /* always locked */
		else
		{
		    di = find_var(lv.ll_name, NULL, TRUE);
		    if (di != NULL)
		    {
			/* Consider a variable locked when:
			 * 1. the variable itself is locked
			 * 2. the value of the variable is locked.
			 * 3. the List or Dict value is locked.
			 */
			rettv->vval.v_number = ((di->di_flags & DI_FLAGS_LOCK)
						  || tv_islocked(&di->di_tv));
		    }
		}
	    }
	    else if (lv.ll_range)
		EMSG(_("E786: Range not allowed"));
	    else if (lv.ll_newkey != NULL)
		EMSG2(_(e_dictkey), lv.ll_newkey);
	    else if (lv.ll_list != NULL)
		/* List item. */
		rettv->vval.v_number = tv_islocked(&lv.ll_li->li_tv);
	    else
		/* Dictionary item. */
		rettv->vval.v_number = tv_islocked(&lv.ll_di->di_tv);
	}
    }

    clear_lval(&lv);
}

static void dict_list(typval_T *argvars, typval_T *rettv, int what);

/*
 * Turn a dict into a list:
 * "what" == 0: list of keys
 * "what" == 1: list of values
 * "what" == 2: list of items
 */
    static void
dict_list(typval_T *argvars, typval_T *rettv, int what)
{
    list_T	*l2;
    dictitem_T	*di;
    hashitem_T	*hi;
    listitem_T	*li;
    listitem_T	*li2;
    dict_T	*d;
    int		todo;

    if (argvars[0].v_type != VAR_DICT)
    {
	EMSG(_(e_dictreq));
	return;
    }
    if ((d = argvars[0].vval.v_dict) == NULL)
	return;

    if (rettv_list_alloc(rettv) == FAIL)
	return;

    todo = (int)d->dv_hashtab.ht_used;
    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    di = HI2DI(hi);

	    li = listitem_alloc();
	    if (li == NULL)
		break;
	    list_append(rettv->vval.v_list, li);

	    if (what == 0)
	    {
		/* keys() */
		li->li_tv.v_type = VAR_STRING;
		li->li_tv.v_lock = 0;
		li->li_tv.vval.v_string = vim_strsave(di->di_key);
	    }
	    else if (what == 1)
	    {
		/* values() */
		copy_tv(&di->di_tv, &li->li_tv);
	    }
	    else
	    {
		/* items() */
		l2 = list_alloc();
		li->li_tv.v_type = VAR_LIST;
		li->li_tv.v_lock = 0;
		li->li_tv.vval.v_list = l2;
		if (l2 == NULL)
		    break;
		++l2->lv_refcount;

		li2 = listitem_alloc();
		if (li2 == NULL)
		    break;
		list_append(l2, li2);
		li2->li_tv.v_type = VAR_STRING;
		li2->li_tv.v_lock = 0;
		li2->li_tv.vval.v_string = vim_strsave(di->di_key);

		li2 = listitem_alloc();
		if (li2 == NULL)
		    break;
		list_append(l2, li2);
		copy_tv(&di->di_tv, &li2->li_tv);
	    }
	}
    }
}

/*
 * "items(dict)" function
 */
    static void
f_items(typval_T *argvars, typval_T *rettv)
{
    dict_list(argvars, rettv, 2);
}

/*
 * "join()" function
 */
    static void
f_join(typval_T *argvars, typval_T *rettv)
{
    garray_T	ga;
    char_u	*sep;

    if (argvars[0].v_type != VAR_LIST)
    {
	EMSG(_(e_listreq));
	return;
    }
    if (argvars[0].vval.v_list == NULL)
	return;
    if (argvars[1].v_type == VAR_UNKNOWN)
	sep = (char_u *)" ";
    else
	sep = get_tv_string_chk(&argvars[1]);

    rettv->v_type = VAR_STRING;

    if (sep != NULL)
    {
	ga_init2(&ga, (int)sizeof(char), 80);
	list_join(&ga, argvars[0].vval.v_list, sep, TRUE, 0);
	ga_append(&ga, NUL);
	rettv->vval.v_string = (char_u *)ga.ga_data;
    }
    else
	rettv->vval.v_string = NULL;
}

/*
 * "jsondecode()" function
 */
    static void
f_jsondecode(typval_T *argvars, typval_T *rettv)
{
    js_read_T	reader;

    reader.js_buf = get_tv_string(&argvars[0]);
    reader.js_fill = NULL;
    reader.js_used = 0;
    if (json_decode_all(&reader, rettv) != OK)
	EMSG(_(e_invarg));
}

/*
 * "jsonencode()" function
 */
    static void
f_jsonencode(typval_T *argvars, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = json_encode(&argvars[0]);
}

/*
 * "keys()" function
 */
    static void
f_keys(typval_T *argvars, typval_T *rettv)
{
    dict_list(argvars, rettv, 0);
}

/*
 * "last_buffer_nr()" function.
 */
    static void
f_last_buffer_nr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		n = 0;
    buf_T	*buf;

    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
	if (n < buf->b_fnum)
	    n = buf->b_fnum;

    rettv->vval.v_number = n;
}

/*
 * "len()" function
 */
    static void
f_len(typval_T *argvars, typval_T *rettv)
{
    switch (argvars[0].v_type)
    {
	case VAR_STRING:
	case VAR_NUMBER:
	    rettv->vval.v_number = (varnumber_T)STRLEN(
					       get_tv_string(&argvars[0]));
	    break;
	case VAR_LIST:
	    rettv->vval.v_number = list_len(argvars[0].vval.v_list);
	    break;
	case VAR_DICT:
	    rettv->vval.v_number = dict_len(argvars[0].vval.v_dict);
	    break;
	case VAR_UNKNOWN:
	case VAR_SPECIAL:
	case VAR_FLOAT:
	case VAR_FUNC:
	    EMSG(_("E701: Invalid type for len()"));
	    break;
    }
}

static void libcall_common(typval_T *argvars, typval_T *rettv, int type);

    static void
libcall_common(typval_T *argvars, typval_T *rettv, int type)
{
#ifdef FEAT_LIBCALL
    char_u		*string_in;
    char_u		**string_result;
    int			nr_result;
#endif

    rettv->v_type = type;
    if (type != VAR_NUMBER)
	rettv->vval.v_string = NULL;

    if (check_restricted() || check_secure())
	return;

#ifdef FEAT_LIBCALL
    /* The first two args must be strings, otherwise its meaningless */
    if (argvars[0].v_type == VAR_STRING && argvars[1].v_type == VAR_STRING)
    {
	string_in = NULL;
	if (argvars[2].v_type == VAR_STRING)
	    string_in = argvars[2].vval.v_string;
	if (type == VAR_NUMBER)
	    string_result = NULL;
	else
	    string_result = &rettv->vval.v_string;
	if (mch_libcall(argvars[0].vval.v_string,
			     argvars[1].vval.v_string,
			     string_in,
			     argvars[2].vval.v_number,
			     string_result,
			     &nr_result) == OK
		&& type == VAR_NUMBER)
	    rettv->vval.v_number = nr_result;
    }
#endif
}

/*
 * "libcall()" function
 */
    static void
f_libcall(typval_T *argvars, typval_T *rettv)
{
    libcall_common(argvars, rettv, VAR_STRING);
}

/*
 * "libcallnr()" function
 */
    static void
f_libcallnr(typval_T *argvars, typval_T *rettv)
{
    libcall_common(argvars, rettv, VAR_NUMBER);
}

/*
 * "line(string)" function
 */
    static void
f_line(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum = 0;
    pos_T	*fp;
    int		fnum;

    fp = var2fpos(&argvars[0], TRUE, &fnum);
    if (fp != NULL)
	lnum = fp->lnum;
    rettv->vval.v_number = lnum;
}

/*
 * "line2byte(lnum)" function
 */
    static void
f_line2byte(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifndef FEAT_BYTEOFF
    rettv->vval.v_number = -1;
#else
    linenr_T	lnum;

    lnum = get_tv_lnum(argvars);
    if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count + 1)
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = ml_find_line_or_offset(curbuf, lnum, NULL);
    if (rettv->vval.v_number >= 0)
	++rettv->vval.v_number;
#endif
}

/*
 * "lispindent(lnum)" function
 */
    static void
f_lispindent(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_LISP
    pos_T	pos;
    linenr_T	lnum;

    pos = curwin->w_cursor;
    lnum = get_tv_lnum(argvars);
    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count)
    {
	curwin->w_cursor.lnum = lnum;
	rettv->vval.v_number = get_lisp_indent();
	curwin->w_cursor = pos;
    }
    else
#endif
	rettv->vval.v_number = -1;
}

/*
 * "localtime()" function
 */
    static void
f_localtime(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = (varnumber_T)time(NULL);
}

static void get_maparg(typval_T *argvars, typval_T *rettv, int exact);

    static void
get_maparg(typval_T *argvars, typval_T *rettv, int exact)
{
    char_u	*keys;
    char_u	*which;
    char_u	buf[NUMBUFLEN];
    char_u	*keys_buf = NULL;
    char_u	*rhs;
    int		mode;
    int		abbr = FALSE;
    int		get_dict = FALSE;
    mapblock_T	*mp;
    int		buffer_local;

    /* return empty string for failure */
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    keys = get_tv_string(&argvars[0]);
    if (*keys == NUL)
	return;

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	which = get_tv_string_buf_chk(&argvars[1], buf);
	if (argvars[2].v_type != VAR_UNKNOWN)
	{
	    abbr = get_tv_number(&argvars[2]);
	    if (argvars[3].v_type != VAR_UNKNOWN)
		get_dict = get_tv_number(&argvars[3]);
	}
    }
    else
	which = (char_u *)"";
    if (which == NULL)
	return;

    mode = get_map_mode(&which, 0);

    keys = replace_termcodes(keys, &keys_buf, TRUE, TRUE, FALSE);
    rhs = check_map(keys, mode, exact, FALSE, abbr, &mp, &buffer_local);
    vim_free(keys_buf);

    if (!get_dict)
    {
	/* Return a string. */
	if (rhs != NULL)
	    rettv->vval.v_string = str2special_save(rhs, FALSE);

    }
    else if (rettv_dict_alloc(rettv) != FAIL && rhs != NULL)
    {
	/* Return a dictionary. */
	char_u	    *lhs = str2special_save(mp->m_keys, TRUE);
	char_u	    *mapmode = map_mode_to_chars(mp->m_mode);
	dict_T	    *dict = rettv->vval.v_dict;

	dict_add_nr_str(dict, "lhs",	 0L, lhs);
	dict_add_nr_str(dict, "rhs",     0L, mp->m_orig_str);
	dict_add_nr_str(dict, "noremap", mp->m_noremap ? 1L : 0L , NULL);
	dict_add_nr_str(dict, "expr",    mp->m_expr    ? 1L : 0L, NULL);
	dict_add_nr_str(dict, "silent",  mp->m_silent  ? 1L : 0L, NULL);
	dict_add_nr_str(dict, "sid",     (long)mp->m_script_ID, NULL);
	dict_add_nr_str(dict, "buffer",  (long)buffer_local, NULL);
	dict_add_nr_str(dict, "nowait",  mp->m_nowait  ? 1L : 0L, NULL);
	dict_add_nr_str(dict, "mode",    0L, mapmode);

	vim_free(lhs);
	vim_free(mapmode);
    }
}

#ifdef FEAT_FLOAT
/*
 * "log()" function
 */
    static void
f_log(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = log(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "log10()" function
 */
    static void
f_log10(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = log10(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

#ifdef FEAT_LUA
/*
 * "luaeval()" function
 */
    static void
f_luaeval(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	buf[NUMBUFLEN];

    str = get_tv_string_buf(&argvars[0], buf);
    do_luaeval(str, argvars + 1, rettv);
}
#endif

/*
 * "map()" function
 */
    static void
f_map(typval_T *argvars, typval_T *rettv)
{
    filter_map(argvars, rettv, TRUE);
}

/*
 * "maparg()" function
 */
    static void
f_maparg(typval_T *argvars, typval_T *rettv)
{
    get_maparg(argvars, rettv, TRUE);
}

/*
 * "mapcheck()" function
 */
    static void
f_mapcheck(typval_T *argvars, typval_T *rettv)
{
    get_maparg(argvars, rettv, FALSE);
}

static void find_some_match(typval_T *argvars, typval_T *rettv, int start);

    static void
find_some_match(typval_T *argvars, typval_T *rettv, int type)
{
    char_u	*str = NULL;
    long	len = 0;
    char_u	*expr = NULL;
    char_u	*pat;
    regmatch_T	regmatch;
    char_u	patbuf[NUMBUFLEN];
    char_u	strbuf[NUMBUFLEN];
    char_u	*save_cpo;
    long	start = 0;
    long	nth = 1;
    colnr_T	startcol = 0;
    int		match = 0;
    list_T	*l = NULL;
    listitem_T	*li = NULL;
    long	idx = 0;
    char_u	*tofree = NULL;

    /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
    save_cpo = p_cpo;
    p_cpo = (char_u *)"";

    rettv->vval.v_number = -1;
    if (type == 3)
    {
	/* return empty list when there are no matches */
	if (rettv_list_alloc(rettv) == FAIL)
	    goto theend;
    }
    else if (type == 2)
    {
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = NULL;
    }

    if (argvars[0].v_type == VAR_LIST)
    {
	if ((l = argvars[0].vval.v_list) == NULL)
	    goto theend;
	li = l->lv_first;
    }
    else
    {
	expr = str = get_tv_string(&argvars[0]);
	len = (long)STRLEN(str);
    }

    pat = get_tv_string_buf_chk(&argvars[1], patbuf);
    if (pat == NULL)
	goto theend;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	int	    error = FALSE;

	start = get_tv_number_chk(&argvars[2], &error);
	if (error)
	    goto theend;
	if (l != NULL)
	{
	    li = list_find(l, start);
	    if (li == NULL)
		goto theend;
	    idx = l->lv_idx;	/* use the cached index */
	}
	else
	{
	    if (start < 0)
		start = 0;
	    if (start > len)
		goto theend;
	    /* When "count" argument is there ignore matches before "start",
	     * otherwise skip part of the string.  Differs when pattern is "^"
	     * or "\<". */
	    if (argvars[3].v_type != VAR_UNKNOWN)
		startcol = start;
	    else
	    {
		str += start;
		len -= start;
	    }
	}

	if (argvars[3].v_type != VAR_UNKNOWN)
	    nth = get_tv_number_chk(&argvars[3], &error);
	if (error)
	    goto theend;
    }

    regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
    if (regmatch.regprog != NULL)
    {
	regmatch.rm_ic = p_ic;

	for (;;)
	{
	    if (l != NULL)
	    {
		if (li == NULL)
		{
		    match = FALSE;
		    break;
		}
		vim_free(tofree);
		str = echo_string(&li->li_tv, &tofree, strbuf, 0);
		if (str == NULL)
		    break;
	    }

	    match = vim_regexec_nl(&regmatch, str, (colnr_T)startcol);

	    if (match && --nth <= 0)
		break;
	    if (l == NULL && !match)
		break;

	    /* Advance to just after the match. */
	    if (l != NULL)
	    {
		li = li->li_next;
		++idx;
	    }
	    else
	    {
#ifdef FEAT_MBYTE
		startcol = (colnr_T)(regmatch.startp[0]
				    + (*mb_ptr2len)(regmatch.startp[0]) - str);
#else
		startcol = (colnr_T)(regmatch.startp[0] + 1 - str);
#endif
		if (startcol > (colnr_T)len
				      || str + startcol <= regmatch.startp[0])
		{
		    match = FALSE;
		    break;
		}
	    }
	}

	if (match)
	{
	    if (type == 3)
	    {
		int i;

		/* return list with matched string and submatches */
		for (i = 0; i < NSUBEXP; ++i)
		{
		    if (regmatch.endp[i] == NULL)
		    {
			if (list_append_string(rettv->vval.v_list,
						     (char_u *)"", 0) == FAIL)
			    break;
		    }
		    else if (list_append_string(rettv->vval.v_list,
				regmatch.startp[i],
				(int)(regmatch.endp[i] - regmatch.startp[i]))
			    == FAIL)
			break;
		}
	    }
	    else if (type == 2)
	    {
		/* return matched string */
		if (l != NULL)
		    copy_tv(&li->li_tv, rettv);
		else
		    rettv->vval.v_string = vim_strnsave(regmatch.startp[0],
				(int)(regmatch.endp[0] - regmatch.startp[0]));
	    }
	    else if (l != NULL)
		rettv->vval.v_number = idx;
	    else
	    {
		if (type != 0)
		    rettv->vval.v_number =
				      (varnumber_T)(regmatch.startp[0] - str);
		else
		    rettv->vval.v_number =
					(varnumber_T)(regmatch.endp[0] - str);
		rettv->vval.v_number += (varnumber_T)(str - expr);
	    }
	}
	vim_regfree(regmatch.regprog);
    }

theend:
    vim_free(tofree);
    p_cpo = save_cpo;
}

/*
 * "match()" function
 */
    static void
f_match(typval_T *argvars, typval_T *rettv)
{
    find_some_match(argvars, rettv, 1);
}

/*
 * "matchadd()" function
 */
    static void
f_matchadd(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    char_u	buf[NUMBUFLEN];
    char_u	*grp = get_tv_string_buf_chk(&argvars[0], buf);	/* group */
    char_u	*pat = get_tv_string_buf_chk(&argvars[1], buf);	/* pattern */
    int		prio = 10;	/* default priority */
    int		id = -1;
    int		error = FALSE;
    char_u	*conceal_char = NULL;

    rettv->vval.v_number = -1;

    if (grp == NULL || pat == NULL)
	return;
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	prio = get_tv_number_chk(&argvars[2], &error);
	if (argvars[3].v_type != VAR_UNKNOWN)
	{
	    id = get_tv_number_chk(&argvars[3], &error);
	    if (argvars[4].v_type != VAR_UNKNOWN)
	    {
		if (argvars[4].v_type != VAR_DICT)
		{
		    EMSG(_(e_dictreq));
		    return;
		}
		if (dict_find(argvars[4].vval.v_dict,
					     (char_u *)"conceal", -1) != NULL)
		    conceal_char = get_dict_string(argvars[4].vval.v_dict,
						  (char_u *)"conceal", FALSE);
	    }
	}
    }
    if (error == TRUE)
	return;
    if (id >= 1 && id <= 3)
    {
	EMSGN("E798: ID is reserved for \":match\": %ld", id);
	return;
    }

    rettv->vval.v_number = match_add(curwin, grp, pat, prio, id, NULL,
								conceal_char);
#endif
}

/*
 * "matchaddpos()" function
 */
    static void
f_matchaddpos(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    char_u	buf[NUMBUFLEN];
    char_u	*group;
    int		prio = 10;
    int		id = -1;
    int		error = FALSE;
    list_T	*l;
    char_u	*conceal_char = NULL;

    rettv->vval.v_number = -1;

    group = get_tv_string_buf_chk(&argvars[0], buf);
    if (group == NULL)
	return;

    if (argvars[1].v_type != VAR_LIST)
    {
	EMSG2(_(e_listarg), "matchaddpos()");
	return;
    }
    l = argvars[1].vval.v_list;
    if (l == NULL)
	return;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	prio = get_tv_number_chk(&argvars[2], &error);
	if (argvars[3].v_type != VAR_UNKNOWN)
	{
	    id = get_tv_number_chk(&argvars[3], &error);
	    if (argvars[4].v_type != VAR_UNKNOWN)
	    {
		if (argvars[4].v_type != VAR_DICT)
		{
		    EMSG(_(e_dictreq));
		    return;
		}
		if (dict_find(argvars[4].vval.v_dict,
					     (char_u *)"conceal", -1) != NULL)
		    conceal_char = get_dict_string(argvars[4].vval.v_dict,
						  (char_u *)"conceal", FALSE);
	    }
	}
    }
    if (error == TRUE)
	return;

    /* id == 3 is ok because matchaddpos() is supposed to substitute :3match */
    if (id == 1 || id == 2)
    {
	EMSGN("E798: ID is reserved for \":match\": %ld", id);
	return;
    }

    rettv->vval.v_number = match_add(curwin, group, NULL, prio, id, l,
								conceal_char);
#endif
}

/*
 * "matcharg()" function
 */
    static void
f_matcharg(typval_T *argvars UNUSED, typval_T *rettv)
{
    if (rettv_list_alloc(rettv) == OK)
    {
#ifdef FEAT_SEARCH_EXTRA
	int	    id = get_tv_number(&argvars[0]);
	matchitem_T *m;

	if (id >= 1 && id <= 3)
	{
	    if ((m = (matchitem_T *)get_match(curwin, id)) != NULL)
	    {
		list_append_string(rettv->vval.v_list,
						syn_id2name(m->hlg_id), -1);
		list_append_string(rettv->vval.v_list, m->pattern, -1);
	    }
	    else
	    {
		list_append_string(rettv->vval.v_list, NULL, -1);
		list_append_string(rettv->vval.v_list, NULL, -1);
	    }
	}
#endif
    }
}

/*
 * "matchdelete()" function
 */
    static void
f_matchdelete(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    rettv->vval.v_number = match_delete(curwin,
				       (int)get_tv_number(&argvars[0]), TRUE);
#endif
}

/*
 * "matchend()" function
 */
    static void
f_matchend(typval_T *argvars, typval_T *rettv)
{
    find_some_match(argvars, rettv, 0);
}

/*
 * "matchlist()" function
 */
    static void
f_matchlist(typval_T *argvars, typval_T *rettv)
{
    find_some_match(argvars, rettv, 3);
}

/*
 * "matchstr()" function
 */
    static void
f_matchstr(typval_T *argvars, typval_T *rettv)
{
    find_some_match(argvars, rettv, 2);
}

static void max_min(typval_T *argvars, typval_T *rettv, int domax);

    static void
max_min(typval_T *argvars, typval_T *rettv, int domax)
{
    long	n = 0;
    long	i;
    int		error = FALSE;

    if (argvars[0].v_type == VAR_LIST)
    {
	list_T		*l;
	listitem_T	*li;

	l = argvars[0].vval.v_list;
	if (l != NULL)
	{
	    li = l->lv_first;
	    if (li != NULL)
	    {
		n = get_tv_number_chk(&li->li_tv, &error);
		for (;;)
		{
		    li = li->li_next;
		    if (li == NULL)
			break;
		    i = get_tv_number_chk(&li->li_tv, &error);
		    if (domax ? i > n : i < n)
			n = i;
		}
	    }
	}
    }
    else if (argvars[0].v_type == VAR_DICT)
    {
	dict_T		*d;
	int		first = TRUE;
	hashitem_T	*hi;
	int		todo;

	d = argvars[0].vval.v_dict;
	if (d != NULL)
	{
	    todo = (int)d->dv_hashtab.ht_used;
	    for (hi = d->dv_hashtab.ht_array; todo > 0; ++hi)
	    {
		if (!HASHITEM_EMPTY(hi))
		{
		    --todo;
		    i = get_tv_number_chk(&HI2DI(hi)->di_tv, &error);
		    if (first)
		    {
			n = i;
			first = FALSE;
		    }
		    else if (domax ? i > n : i < n)
			n = i;
		}
	    }
	}
    }
    else
	EMSG(_(e_listdictarg));
    rettv->vval.v_number = error ? 0 : n;
}

/*
 * "max()" function
 */
    static void
f_max(typval_T *argvars, typval_T *rettv)
{
    max_min(argvars, rettv, TRUE);
}

/*
 * "min()" function
 */
    static void
f_min(typval_T *argvars, typval_T *rettv)
{
    max_min(argvars, rettv, FALSE);
}

static int mkdir_recurse(char_u *dir, int prot);

/*
 * Create the directory in which "dir" is located, and higher levels when
 * needed.
 */
    static int
mkdir_recurse(char_u *dir, int prot)
{
    char_u	*p;
    char_u	*updir;
    int		r = FAIL;

    /* Get end of directory name in "dir".
     * We're done when it's "/" or "c:/". */
    p = gettail_sep(dir);
    if (p <= get_past_head(dir))
	return OK;

    /* If the directory exists we're done.  Otherwise: create it.*/
    updir = vim_strnsave(dir, (int)(p - dir));
    if (updir == NULL)
	return FAIL;
    if (mch_isdir(updir))
	r = OK;
    else if (mkdir_recurse(updir, prot) == OK)
	r = vim_mkdir_emsg(updir, prot);
    vim_free(updir);
    return r;
}

#ifdef vim_mkdir
/*
 * "mkdir()" function
 */
    static void
f_mkdir(typval_T *argvars, typval_T *rettv)
{
    char_u	*dir;
    char_u	buf[NUMBUFLEN];
    int		prot = 0755;

    rettv->vval.v_number = FAIL;
    if (check_restricted() || check_secure())
	return;

    dir = get_tv_string_buf(&argvars[0], buf);
    if (*dir == NUL)
	rettv->vval.v_number = FAIL;
    else
    {
	if (*gettail(dir) == NUL)
	    /* remove trailing slashes */
	    *gettail_sep(dir) = NUL;

	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    if (argvars[2].v_type != VAR_UNKNOWN)
		prot = get_tv_number_chk(&argvars[2], NULL);
	    if (prot != -1 && STRCMP(get_tv_string(&argvars[1]), "p") == 0)
		mkdir_recurse(dir, prot);
	}
	rettv->vval.v_number = prot == -1 ? FAIL : vim_mkdir_emsg(dir, prot);
    }
}
#endif

/*
 * "mode()" function
 */
    static void
f_mode(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[3];

    buf[1] = NUL;
    buf[2] = NUL;

    if (VIsual_active)
    {
	if (VIsual_select)
	    buf[0] = VIsual_mode + 's' - 'v';
	else
	    buf[0] = VIsual_mode;
    }
    else if (State == HITRETURN || State == ASKMORE || State == SETWSIZE
		|| State == CONFIRM)
    {
	buf[0] = 'r';
	if (State == ASKMORE)
	    buf[1] = 'm';
	else if (State == CONFIRM)
	    buf[1] = '?';
    }
    else if (State == EXTERNCMD)
	buf[0] = '!';
    else if (State & INSERT)
    {
#ifdef FEAT_VREPLACE
	if (State & VREPLACE_FLAG)
	{
	    buf[0] = 'R';
	    buf[1] = 'v';
	}
	else
#endif
	if (State & REPLACE_FLAG)
	    buf[0] = 'R';
	else
	    buf[0] = 'i';
    }
    else if (State & CMDLINE)
    {
	buf[0] = 'c';
	if (exmode_active)
	    buf[1] = 'v';
    }
    else if (exmode_active)
    {
	buf[0] = 'c';
	buf[1] = 'e';
    }
    else
    {
	buf[0] = 'n';
	if (finish_op)
	    buf[1] = 'o';
    }

    /* Clear out the minor mode when the argument is not a non-zero number or
     * non-empty string.  */
    if (!non_zero_arg(&argvars[0]))
	buf[1] = NUL;

    rettv->vval.v_string = vim_strsave(buf);
    rettv->v_type = VAR_STRING;
}

#if defined(FEAT_MZSCHEME) || defined(PROTO)
/*
 * "mzeval()" function
 */
    static void
f_mzeval(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	buf[NUMBUFLEN];

    str = get_tv_string_buf(&argvars[0], buf);
    do_mzeval(str, rettv);
}

    void
mzscheme_call_vim(char_u *name, typval_T *args, typval_T *rettv)
{
    typval_T argvars[3];

    argvars[0].v_type = VAR_STRING;
    argvars[0].vval.v_string = name;
    copy_tv(args, &argvars[1]);
    argvars[2].v_type = VAR_UNKNOWN;
    f_call(argvars, rettv);
    clear_tv(&argvars[1]);
}
#endif

/*
 * "nextnonblank()" function
 */
    static void
f_nextnonblank(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;

    for (lnum = get_tv_lnum(argvars); ; ++lnum)
    {
	if (lnum < 0 || lnum > curbuf->b_ml.ml_line_count)
	{
	    lnum = 0;
	    break;
	}
	if (*skipwhite(ml_get(lnum)) != NUL)
	    break;
    }
    rettv->vval.v_number = lnum;
}

/*
 * "nr2char()" function
 */
    static void
f_nr2char(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];

#ifdef FEAT_MBYTE
    if (has_mbyte)
    {
	int	utf8 = 0;

	if (argvars[1].v_type != VAR_UNKNOWN)
	    utf8 = get_tv_number_chk(&argvars[1], NULL);
	if (utf8)
	    buf[(*utf_char2bytes)((int)get_tv_number(&argvars[0]), buf)] = NUL;
	else
	    buf[(*mb_char2bytes)((int)get_tv_number(&argvars[0]), buf)] = NUL;
    }
    else
#endif
    {
	buf[0] = (char_u)get_tv_number(&argvars[0]);
	buf[1] = NUL;
    }
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strsave(buf);
}

/*
 * "or(expr, expr)" function
 */
    static void
f_or(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = get_tv_number_chk(&argvars[0], NULL)
					| get_tv_number_chk(&argvars[1], NULL);
}

/*
 * "pathshorten()" function
 */
    static void
f_pathshorten(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;

    rettv->v_type = VAR_STRING;
    p = get_tv_string_chk(&argvars[0]);
    if (p == NULL)
	rettv->vval.v_string = NULL;
    else
    {
	p = vim_strsave(p);
	rettv->vval.v_string = p;
	if (p != NULL)
	    shorten_dir(p);
    }
}

#ifdef FEAT_PERL
/*
 * "perleval()" function
 */
    static void
f_perleval(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	buf[NUMBUFLEN];

    str = get_tv_string_buf(&argvars[0], buf);
    do_perleval(str, rettv);
}
#endif

#ifdef FEAT_FLOAT
/*
 * "pow()" function
 */
    static void
f_pow(typval_T *argvars, typval_T *rettv)
{
    float_T	fx, fy;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &fx) == OK
				     && get_float_arg(&argvars[1], &fy) == OK)
	rettv->vval.v_float = pow(fx, fy);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "prevnonblank()" function
 */
    static void
f_prevnonblank(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;

    lnum = get_tv_lnum(argvars);
    if (lnum < 1 || lnum > curbuf->b_ml.ml_line_count)
	lnum = 0;
    else
	while (lnum >= 1 && *skipwhite(ml_get(lnum)) == NUL)
	    --lnum;
    rettv->vval.v_number = lnum;
}

/* This dummy va_list is here because:
 * - passing a NULL pointer doesn't work when va_list isn't a pointer
 * - locally in the function results in a "used before set" warning
 * - using va_start() to initialize it gives "function with fixed args" error */
static va_list	ap;

/*
 * "printf()" function
 */
    static void
f_printf(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];
    int		len;
    char_u	*s;
    int		saved_did_emsg = did_emsg;
    char	*fmt;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;

    /* Get the required length, allocate the buffer and do it for real. */
    did_emsg = FALSE;
    fmt = (char *)get_tv_string_buf(&argvars[0], buf);
    len = vim_vsnprintf(NULL, 0, fmt, ap, argvars + 1);
    if (!did_emsg)
    {
	s = alloc(len + 1);
	if (s != NULL)
	{
	    rettv->vval.v_string = s;
	    (void)vim_vsnprintf((char *)s, len + 1, fmt, ap, argvars + 1);
	}
    }
    did_emsg |= saved_did_emsg;
}

/*
 * "pumvisible()" function
 */
    static void
f_pumvisible(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_INS_EXPAND
    if (pum_visible())
	rettv->vval.v_number = 1;
#endif
}

#ifdef FEAT_PYTHON3
/*
 * "py3eval()" function
 */
    static void
f_py3eval(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	buf[NUMBUFLEN];

    str = get_tv_string_buf(&argvars[0], buf);
    do_py3eval(str, rettv);
}
#endif

#ifdef FEAT_PYTHON
/*
 * "pyeval()" function
 */
    static void
f_pyeval(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	buf[NUMBUFLEN];

    str = get_tv_string_buf(&argvars[0], buf);
    do_pyeval(str, rettv);
}
#endif

/*
 * "range()" function
 */
    static void
f_range(typval_T *argvars, typval_T *rettv)
{
    long	start;
    long	end;
    long	stride = 1;
    long	i;
    int		error = FALSE;

    start = get_tv_number_chk(&argvars[0], &error);
    if (argvars[1].v_type == VAR_UNKNOWN)
    {
	end = start - 1;
	start = 0;
    }
    else
    {
	end = get_tv_number_chk(&argvars[1], &error);
	if (argvars[2].v_type != VAR_UNKNOWN)
	    stride = get_tv_number_chk(&argvars[2], &error);
    }

    if (error)
	return;		/* type error; errmsg already given */
    if (stride == 0)
	EMSG(_("E726: Stride is zero"));
    else if (stride > 0 ? end + 1 < start : end - 1 > start)
	EMSG(_("E727: Start past end"));
    else
    {
	if (rettv_list_alloc(rettv) == OK)
	    for (i = start; stride > 0 ? i <= end : i >= end; i += stride)
		if (list_append_number(rettv->vval.v_list,
						      (varnumber_T)i) == FAIL)
		    break;
    }
}

/*
 * "readfile()" function
 */
    static void
f_readfile(typval_T *argvars, typval_T *rettv)
{
    int		binary = FALSE;
    int		failed = FALSE;
    char_u	*fname;
    FILE	*fd;
    char_u	buf[(IOSIZE/256)*256];	/* rounded to avoid odd + 1 */
    int		io_size = sizeof(buf);
    int		readlen;		/* size of last fread() */
    char_u	*prev	 = NULL;	/* previously read bytes, if any */
    long	prevlen  = 0;		/* length of data in prev */
    long	prevsize = 0;		/* size of prev buffer */
    long	maxline  = MAXLNUM;
    long	cnt	 = 0;
    char_u	*p;			/* position in buf */
    char_u	*start;			/* start of current line */

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	if (STRCMP(get_tv_string(&argvars[1]), "b") == 0)
	    binary = TRUE;
	if (argvars[2].v_type != VAR_UNKNOWN)
	    maxline = get_tv_number(&argvars[2]);
    }

    if (rettv_list_alloc(rettv) == FAIL)
	return;

    /* Always open the file in binary mode, library functions have a mind of
     * their own about CR-LF conversion. */
    fname = get_tv_string(&argvars[0]);
    if (*fname == NUL || (fd = mch_fopen((char *)fname, READBIN)) == NULL)
    {
	EMSG2(_(e_notopen), *fname == NUL ? (char_u *)_("<empty>") : fname);
	return;
    }

    while (cnt < maxline || maxline < 0)
    {
	readlen = (int)fread(buf, 1, io_size, fd);

	/* This for loop processes what was read, but is also entered at end
	 * of file so that either:
	 * - an incomplete line gets written
	 * - a "binary" file gets an empty line at the end if it ends in a
	 *   newline.  */
	for (p = buf, start = buf;
		p < buf + readlen || (readlen <= 0 && (prevlen > 0 || binary));
		++p)
	{
	    if (*p == '\n' || readlen <= 0)
	    {
		listitem_T  *li;
		char_u	    *s	= NULL;
		long_u	    len = p - start;

		/* Finished a line.  Remove CRs before NL. */
		if (readlen > 0 && !binary)
		{
		    while (len > 0 && start[len - 1] == '\r')
			--len;
		    /* removal may cross back to the "prev" string */
		    if (len == 0)
			while (prevlen > 0 && prev[prevlen - 1] == '\r')
			    --prevlen;
		}
		if (prevlen == 0)
		    s = vim_strnsave(start, (int)len);
		else
		{
		    /* Change "prev" buffer to be the right size.  This way
		     * the bytes are only copied once, and very long lines are
		     * allocated only once.  */
		    if ((s = vim_realloc(prev, prevlen + len + 1)) != NULL)
		    {
			mch_memmove(s + prevlen, start, len);
			s[prevlen + len] = NUL;
			prev = NULL; /* the list will own the string */
			prevlen = prevsize = 0;
		    }
		}
		if (s == NULL)
		{
		    do_outofmem_msg((long_u) prevlen + len + 1);
		    failed = TRUE;
		    break;
		}

		if ((li = listitem_alloc()) == NULL)
		{
		    vim_free(s);
		    failed = TRUE;
		    break;
		}
		li->li_tv.v_type = VAR_STRING;
		li->li_tv.v_lock = 0;
		li->li_tv.vval.v_string = s;
		list_append(rettv->vval.v_list, li);

		start = p + 1; /* step over newline */
		if ((++cnt >= maxline && maxline >= 0) || readlen <= 0)
		    break;
	    }
	    else if (*p == NUL)
		*p = '\n';
#ifdef FEAT_MBYTE
	    /* Check for utf8 "bom"; U+FEFF is encoded as EF BB BF.  Do this
	     * when finding the BF and check the previous two bytes. */
	    else if (*p == 0xbf && enc_utf8 && !binary)
	    {
		/* Find the two bytes before the 0xbf.	If p is at buf, or buf
		 * + 1, these may be in the "prev" string. */
		char_u back1 = p >= buf + 1 ? p[-1]
				     : prevlen >= 1 ? prev[prevlen - 1] : NUL;
		char_u back2 = p >= buf + 2 ? p[-2]
			  : p == buf + 1 && prevlen >= 1 ? prev[prevlen - 1]
			  : prevlen >= 2 ? prev[prevlen - 2] : NUL;

		if (back2 == 0xef && back1 == 0xbb)
		{
		    char_u *dest = p - 2;

		    /* Usually a BOM is at the beginning of a file, and so at
		     * the beginning of a line; then we can just step over it.
		     */
		    if (start == dest)
			start = p + 1;
		    else
		    {
			/* have to shuffle buf to close gap */
			int adjust_prevlen = 0;

			if (dest < buf)
			{
			    adjust_prevlen = (int)(buf - dest); /* must be 1 or 2 */
			    dest = buf;
			}
			if (readlen > p - buf + 1)
			    mch_memmove(dest, p + 1, readlen - (p - buf) - 1);
			readlen -= 3 - adjust_prevlen;
			prevlen -= adjust_prevlen;
			p = dest - 1;
		    }
		}
	    }
#endif
	} /* for */

	if (failed || (cnt >= maxline && maxline >= 0) || readlen <= 0)
	    break;
	if (start < p)
	{
	    /* There's part of a line in buf, store it in "prev". */
	    if (p - start + prevlen >= prevsize)
	    {
		/* need bigger "prev" buffer */
		char_u *newprev;

		/* A common use case is ordinary text files and "prev" gets a
		 * fragment of a line, so the first allocation is made
		 * small, to avoid repeatedly 'allocing' large and
		 * 'reallocing' small. */
		if (prevsize == 0)
		    prevsize = (long)(p - start);
		else
		{
		    long grow50pc = (prevsize * 3) / 2;
		    long growmin  = (long)((p - start) * 2 + prevlen);
		    prevsize = grow50pc > growmin ? grow50pc : growmin;
		}
		newprev = prev == NULL ? alloc(prevsize)
						: vim_realloc(prev, prevsize);
		if (newprev == NULL)
		{
		    do_outofmem_msg((long_u)prevsize);
		    failed = TRUE;
		    break;
		}
		prev = newprev;
	    }
	    /* Add the line part to end of "prev". */
	    mch_memmove(prev + prevlen, start, p - start);
	    prevlen += (long)(p - start);
	}
    } /* while */

    /*
     * For a negative line count use only the lines at the end of the file,
     * free the rest.
     */
    if (!failed && maxline < 0)
	while (cnt > -maxline)
	{
	    listitem_remove(rettv->vval.v_list, rettv->vval.v_list->lv_first);
	    --cnt;
	}

    if (failed)
    {
	list_free(rettv->vval.v_list, TRUE);
	/* readfile doc says an empty list is returned on error */
	rettv->vval.v_list = list_alloc();
    }

    vim_free(prev);
    fclose(fd);
}

#if defined(FEAT_RELTIME)
static int list2proftime(typval_T *arg, proftime_T *tm);

/*
 * Convert a List to proftime_T.
 * Return FAIL when there is something wrong.
 */
    static int
list2proftime(typval_T *arg, proftime_T *tm)
{
    long	n1, n2;
    int	error = FALSE;

    if (arg->v_type != VAR_LIST || arg->vval.v_list == NULL
					     || arg->vval.v_list->lv_len != 2)
	return FAIL;
    n1 = list_find_nr(arg->vval.v_list, 0L, &error);
    n2 = list_find_nr(arg->vval.v_list, 1L, &error);
# ifdef WIN3264
    tm->HighPart = n1;
    tm->LowPart = n2;
# else
    tm->tv_sec = n1;
    tm->tv_usec = n2;
# endif
    return error ? FAIL : OK;
}
#endif /* FEAT_RELTIME */

/*
 * "reltime()" function
 */
    static void
f_reltime(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_RELTIME
    proftime_T	res;
    proftime_T	start;

    if (argvars[0].v_type == VAR_UNKNOWN)
    {
	/* No arguments: get current time. */
	profile_start(&res);
    }
    else if (argvars[1].v_type == VAR_UNKNOWN)
    {
	if (list2proftime(&argvars[0], &res) == FAIL)
	    return;
	profile_end(&res);
    }
    else
    {
	/* Two arguments: compute the difference. */
	if (list2proftime(&argvars[0], &start) == FAIL
		|| list2proftime(&argvars[1], &res) == FAIL)
	    return;
	profile_sub(&res, &start);
    }

    if (rettv_list_alloc(rettv) == OK)
    {
	long	n1, n2;

# ifdef WIN3264
	n1 = res.HighPart;
	n2 = res.LowPart;
# else
	n1 = res.tv_sec;
	n2 = res.tv_usec;
# endif
	list_append_number(rettv->vval.v_list, (varnumber_T)n1);
	list_append_number(rettv->vval.v_list, (varnumber_T)n2);
    }
#endif
}

/*
 * "reltimestr()" function
 */
    static void
f_reltimestr(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_RELTIME
    proftime_T	tm;
#endif

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_RELTIME
    if (list2proftime(&argvars[0], &tm) == OK)
	rettv->vval.v_string = vim_strsave((char_u *)profile_msg(&tm));
#endif
}

#if defined(FEAT_CLIENTSERVER) && defined(FEAT_X11)
static void make_connection(void);
static int check_connection(void);

    static void
make_connection(void)
{
    if (X_DISPLAY == NULL
# ifdef FEAT_GUI
	    && !gui.in_use
# endif
	    )
    {
	x_force_connect = TRUE;
	setup_term_clip();
	x_force_connect = FALSE;
    }
}

    static int
check_connection(void)
{
    make_connection();
    if (X_DISPLAY == NULL)
    {
	EMSG(_("E240: No connection to Vim server"));
	return FAIL;
    }
    return OK;
}
#endif

#ifdef FEAT_CLIENTSERVER
static void remote_common(typval_T *argvars, typval_T *rettv, int expr);

    static void
remote_common(typval_T *argvars, typval_T *rettv, int expr)
{
    char_u	*server_name;
    char_u	*keys;
    char_u	*r = NULL;
    char_u	buf[NUMBUFLEN];
# ifdef WIN32
    HWND	w;
# else
    Window	w;
# endif

    if (check_restricted() || check_secure())
	return;

# ifdef FEAT_X11
    if (check_connection() == FAIL)
	return;
# endif

    server_name = get_tv_string_chk(&argvars[0]);
    if (server_name == NULL)
	return;		/* type error; errmsg already given */
    keys = get_tv_string_buf(&argvars[1], buf);
# ifdef WIN32
    if (serverSendToVim(server_name, keys, &r, &w, expr, TRUE) < 0)
# else
    if (serverSendToVim(X_DISPLAY, server_name, keys, &r, &w, expr, 0, TRUE)
									  < 0)
# endif
    {
	if (r != NULL)
	    EMSG(r);		/* sending worked but evaluation failed */
	else
	    EMSG2(_("E241: Unable to send to %s"), server_name);
	return;
    }

    rettv->vval.v_string = r;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	dictitem_T	v;
	char_u		str[30];
	char_u		*idvar;

	sprintf((char *)str, PRINTF_HEX_LONG_U, (long_u)w);
	v.di_tv.v_type = VAR_STRING;
	v.di_tv.vval.v_string = vim_strsave(str);
	idvar = get_tv_string_chk(&argvars[2]);
	if (idvar != NULL)
	    set_var(idvar, &v.di_tv, FALSE);
	vim_free(v.di_tv.vval.v_string);
    }
}
#endif

/*
 * "remote_expr()" function
 */
    static void
f_remote_expr(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_CLIENTSERVER
    remote_common(argvars, rettv, TRUE);
#endif
}

/*
 * "remote_foreground()" function
 */
    static void
f_remote_foreground(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_CLIENTSERVER
# ifdef WIN32
    /* On Win32 it's done in this application. */
    {
	char_u	*server_name = get_tv_string_chk(&argvars[0]);

	if (server_name != NULL)
	    serverForeground(server_name);
    }
# else
    /* Send a foreground() expression to the server. */
    argvars[1].v_type = VAR_STRING;
    argvars[1].vval.v_string = vim_strsave((char_u *)"foreground()");
    argvars[2].v_type = VAR_UNKNOWN;
    remote_common(argvars, rettv, TRUE);
    vim_free(argvars[1].vval.v_string);
# endif
#endif
}

    static void
f_remote_peek(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CLIENTSERVER
    dictitem_T	v;
    char_u	*s = NULL;
# ifdef WIN32
    long_u	n = 0;
# endif
    char_u	*serverid;

    if (check_restricted() || check_secure())
    {
	rettv->vval.v_number = -1;
	return;
    }
    serverid = get_tv_string_chk(&argvars[0]);
    if (serverid == NULL)
    {
	rettv->vval.v_number = -1;
	return;		/* type error; errmsg already given */
    }
# ifdef WIN32
    sscanf(serverid, SCANF_HEX_LONG_U, &n);
    if (n == 0)
	rettv->vval.v_number = -1;
    else
    {
	s = serverGetReply((HWND)n, FALSE, FALSE, FALSE);
	rettv->vval.v_number = (s != NULL);
    }
# else
    if (check_connection() == FAIL)
	return;

    rettv->vval.v_number = serverPeekReply(X_DISPLAY,
						serverStrToWin(serverid), &s);
# endif

    if (argvars[1].v_type != VAR_UNKNOWN && rettv->vval.v_number > 0)
    {
	char_u		*retvar;

	v.di_tv.v_type = VAR_STRING;
	v.di_tv.vval.v_string = vim_strsave(s);
	retvar = get_tv_string_chk(&argvars[1]);
	if (retvar != NULL)
	    set_var(retvar, &v.di_tv, FALSE);
	vim_free(v.di_tv.vval.v_string);
    }
#else
    rettv->vval.v_number = -1;
#endif
}

    static void
f_remote_read(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*r = NULL;

#ifdef FEAT_CLIENTSERVER
    char_u	*serverid = get_tv_string_chk(&argvars[0]);

    if (serverid != NULL && !check_restricted() && !check_secure())
    {
# ifdef WIN32
	/* The server's HWND is encoded in the 'id' parameter */
	long_u		n = 0;

	sscanf(serverid, SCANF_HEX_LONG_U, &n);
	if (n != 0)
	    r = serverGetReply((HWND)n, FALSE, TRUE, TRUE);
	if (r == NULL)
# else
	if (check_connection() == FAIL || serverReadReply(X_DISPLAY,
		serverStrToWin(serverid), &r, FALSE) < 0)
# endif
	    EMSG(_("E277: Unable to read a server reply"));
    }
#endif
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = r;
}

/*
 * "remote_send()" function
 */
    static void
f_remote_send(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
#ifdef FEAT_CLIENTSERVER
    remote_common(argvars, rettv, FALSE);
#endif
}

/*
 * "remove()" function
 */
    static void
f_remove(typval_T *argvars, typval_T *rettv)
{
    list_T	*l;
    listitem_T	*item, *item2;
    listitem_T	*li;
    long	idx;
    long	end;
    char_u	*key;
    dict_T	*d;
    dictitem_T	*di;
    char_u	*arg_errmsg = (char_u *)N_("remove() argument");

    if (argvars[0].v_type == VAR_DICT)
    {
	if (argvars[2].v_type != VAR_UNKNOWN)
	    EMSG2(_(e_toomanyarg), "remove()");
	else if ((d = argvars[0].vval.v_dict) != NULL
		&& !tv_check_lock(d->dv_lock, arg_errmsg, TRUE))
	{
	    key = get_tv_string_chk(&argvars[1]);
	    if (key != NULL)
	    {
		di = dict_find(d, key, -1);
		if (di == NULL)
		    EMSG2(_(e_dictkey), key);
		else if (!var_check_fixed(di->di_flags, arg_errmsg, TRUE)
			    && !var_check_ro(di->di_flags, arg_errmsg, TRUE))
		{
		    *rettv = di->di_tv;
		    init_tv(&di->di_tv);
		    dictitem_remove(d, di);
		}
	    }
	}
    }
    else if (argvars[0].v_type != VAR_LIST)
	EMSG2(_(e_listdictarg), "remove()");
    else if ((l = argvars[0].vval.v_list) != NULL
	    && !tv_check_lock(l->lv_lock, arg_errmsg, TRUE))
    {
	int	    error = FALSE;

	idx = get_tv_number_chk(&argvars[1], &error);
	if (error)
	    ;		/* type error: do nothing, errmsg already given */
	else if ((item = list_find(l, idx)) == NULL)
	    EMSGN(_(e_listidx), idx);
	else
	{
	    if (argvars[2].v_type == VAR_UNKNOWN)
	    {
		/* Remove one item, return its value. */
		vimlist_remove(l, item, item);
		*rettv = item->li_tv;
		vim_free(item);
	    }
	    else
	    {
		/* Remove range of items, return list with values. */
		end = get_tv_number_chk(&argvars[2], &error);
		if (error)
		    ;		/* type error: do nothing */
		else if ((item2 = list_find(l, end)) == NULL)
		    EMSGN(_(e_listidx), end);
		else
		{
		    int	    cnt = 0;

		    for (li = item; li != NULL; li = li->li_next)
		    {
			++cnt;
			if (li == item2)
			    break;
		    }
		    if (li == NULL)  /* didn't find "item2" after "item" */
			EMSG(_(e_invrange));
		    else
		    {
			vimlist_remove(l, item, item2);
			if (rettv_list_alloc(rettv) == OK)
			{
			    l = rettv->vval.v_list;
			    l->lv_first = item;
			    l->lv_last = item2;
			    item->li_prev = NULL;
			    item2->li_next = NULL;
			    l->lv_len = cnt;
			}
		    }
		}
	    }
	}
    }
}

/*
 * "rename({from}, {to})" function
 */
    static void
f_rename(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];

    if (check_restricted() || check_secure())
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = vim_rename(get_tv_string(&argvars[0]),
				      get_tv_string_buf(&argvars[1], buf));
}

/*
 * "repeat()" function
 */
    static void
f_repeat(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;
    int		n;
    int		slen;
    int		len;
    char_u	*r;
    int		i;

    n = get_tv_number(&argvars[1]);
    if (argvars[0].v_type == VAR_LIST)
    {
	if (rettv_list_alloc(rettv) == OK && argvars[0].vval.v_list != NULL)
	    while (n-- > 0)
		if (list_extend(rettv->vval.v_list,
					argvars[0].vval.v_list, NULL) == FAIL)
		    break;
    }
    else
    {
	p = get_tv_string(&argvars[0]);
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = NULL;

	slen = (int)STRLEN(p);
	len = slen * n;
	if (len <= 0)
	    return;

	r = alloc(len + 1);
	if (r != NULL)
	{
	    for (i = 0; i < n; i++)
		mch_memmove(r + i * slen, p, (size_t)slen);
	    r[len] = NUL;
	}

	rettv->vval.v_string = r;
    }
}

/*
 * "resolve()" function
 */
    static void
f_resolve(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;
#ifdef HAVE_READLINK
    char_u	*buf = NULL;
#endif

    p = get_tv_string(&argvars[0]);
#ifdef FEAT_SHORTCUT
    {
	char_u	*v = NULL;

	v = mch_resolve_shortcut(p);
	if (v != NULL)
	    rettv->vval.v_string = v;
	else
	    rettv->vval.v_string = vim_strsave(p);
    }
#else
# ifdef HAVE_READLINK
    {
	char_u	*cpy;
	int	len;
	char_u	*remain = NULL;
	char_u	*q;
	int	is_relative_to_current = FALSE;
	int	has_trailing_pathsep = FALSE;
	int	limit = 100;

	p = vim_strsave(p);

	if (p[0] == '.' && (vim_ispathsep(p[1])
				   || (p[1] == '.' && (vim_ispathsep(p[2])))))
	    is_relative_to_current = TRUE;

	len = STRLEN(p);
	if (len > 0 && after_pathsep(p, p + len))
	{
	    has_trailing_pathsep = TRUE;
	    p[len - 1] = NUL; /* the trailing slash breaks readlink() */
	}

	q = getnextcomp(p);
	if (*q != NUL)
	{
	    /* Separate the first path component in "p", and keep the
	     * remainder (beginning with the path separator). */
	    remain = vim_strsave(q - 1);
	    q[-1] = NUL;
	}

	buf = alloc(MAXPATHL + 1);
	if (buf == NULL)
	    goto fail;

	for (;;)
	{
	    for (;;)
	    {
		len = readlink((char *)p, (char *)buf, MAXPATHL);
		if (len <= 0)
		    break;
		buf[len] = NUL;

		if (limit-- == 0)
		{
		    vim_free(p);
		    vim_free(remain);
		    EMSG(_("E655: Too many symbolic links (cycle?)"));
		    rettv->vval.v_string = NULL;
		    goto fail;
		}

		/* Ensure that the result will have a trailing path separator
		 * if the argument has one. */
		if (remain == NULL && has_trailing_pathsep)
		    add_pathsep(buf);

		/* Separate the first path component in the link value and
		 * concatenate the remainders. */
		q = getnextcomp(vim_ispathsep(*buf) ? buf + 1 : buf);
		if (*q != NUL)
		{
		    if (remain == NULL)
			remain = vim_strsave(q - 1);
		    else
		    {
			cpy = concat_str(q - 1, remain);
			if (cpy != NULL)
			{
			    vim_free(remain);
			    remain = cpy;
			}
		    }
		    q[-1] = NUL;
		}

		q = gettail(p);
		if (q > p && *q == NUL)
		{
		    /* Ignore trailing path separator. */
		    q[-1] = NUL;
		    q = gettail(p);
		}
		if (q > p && !mch_isFullName(buf))
		{
		    /* symlink is relative to directory of argument */
		    cpy = alloc((unsigned)(STRLEN(p) + STRLEN(buf) + 1));
		    if (cpy != NULL)
		    {
			STRCPY(cpy, p);
			STRCPY(gettail(cpy), buf);
			vim_free(p);
			p = cpy;
		    }
		}
		else
		{
		    vim_free(p);
		    p = vim_strsave(buf);
		}
	    }

	    if (remain == NULL)
		break;

	    /* Append the first path component of "remain" to "p". */
	    q = getnextcomp(remain + 1);
	    len = q - remain - (*q != NUL);
	    cpy = vim_strnsave(p, STRLEN(p) + len);
	    if (cpy != NULL)
	    {
		STRNCAT(cpy, remain, len);
		vim_free(p);
		p = cpy;
	    }
	    /* Shorten "remain". */
	    if (*q != NUL)
		STRMOVE(remain, q - 1);
	    else
	    {
		vim_free(remain);
		remain = NULL;
	    }
	}

	/* If the result is a relative path name, make it explicitly relative to
	 * the current directory if and only if the argument had this form. */
	if (!vim_ispathsep(*p))
	{
	    if (is_relative_to_current
		    && *p != NUL
		    && !(p[0] == '.'
			&& (p[1] == NUL
			    || vim_ispathsep(p[1])
			    || (p[1] == '.'
				&& (p[2] == NUL
				    || vim_ispathsep(p[2]))))))
	    {
		/* Prepend "./". */
		cpy = concat_str((char_u *)"./", p);
		if (cpy != NULL)
		{
		    vim_free(p);
		    p = cpy;
		}
	    }
	    else if (!is_relative_to_current)
	    {
		/* Strip leading "./". */
		q = p;
		while (q[0] == '.' && vim_ispathsep(q[1]))
		    q += 2;
		if (q > p)
		    STRMOVE(p, p + 2);
	    }
	}

	/* Ensure that the result will have no trailing path separator
	 * if the argument had none.  But keep "/" or "//". */
	if (!has_trailing_pathsep)
	{
	    q = p + STRLEN(p);
	    if (after_pathsep(p, q))
		*gettail_sep(p) = NUL;
	}

	rettv->vval.v_string = p;
    }
# else
    rettv->vval.v_string = vim_strsave(p);
# endif
#endif

    simplify_filename(rettv->vval.v_string);

#ifdef HAVE_READLINK
fail:
    vim_free(buf);
#endif
    rettv->v_type = VAR_STRING;
}

/*
 * "reverse({list})" function
 */
    static void
f_reverse(typval_T *argvars, typval_T *rettv)
{
    list_T	*l;
    listitem_T	*li, *ni;

    if (argvars[0].v_type != VAR_LIST)
	EMSG2(_(e_listarg), "reverse()");
    else if ((l = argvars[0].vval.v_list) != NULL
	    && !tv_check_lock(l->lv_lock,
				    (char_u *)N_("reverse() argument"), TRUE))
    {
	li = l->lv_last;
	l->lv_first = l->lv_last = NULL;
	l->lv_len = 0;
	while (li != NULL)
	{
	    ni = li->li_prev;
	    list_append(l, li);
	    li = ni;
	}
	rettv->vval.v_list = l;
	rettv->v_type = VAR_LIST;
	++l->lv_refcount;
	l->lv_idx = l->lv_len - l->lv_idx - 1;
    }
}

#define SP_NOMOVE	0x01	    /* don't move cursor */
#define SP_REPEAT	0x02	    /* repeat to find outer pair */
#define SP_RETCOUNT	0x04	    /* return matchcount */
#define SP_SETPCMARK	0x08	    /* set previous context mark */
#define SP_START	0x10	    /* accept match at start position */
#define SP_SUBPAT	0x20	    /* return nr of matching sub-pattern */
#define SP_END		0x40	    /* leave cursor at end of match */
#define SP_COLUMN	0x80	    /* start at cursor column */

static int get_search_arg(typval_T *varp, int *flagsp);

/*
 * Get flags for a search function.
 * Possibly sets "p_ws".
 * Returns BACKWARD, FORWARD or zero (for an error).
 */
    static int
get_search_arg(typval_T *varp, int *flagsp)
{
    int		dir = FORWARD;
    char_u	*flags;
    char_u	nbuf[NUMBUFLEN];
    int		mask;

    if (varp->v_type != VAR_UNKNOWN)
    {
	flags = get_tv_string_buf_chk(varp, nbuf);
	if (flags == NULL)
	    return 0;		/* type error; errmsg already given */
	while (*flags != NUL)
	{
	    switch (*flags)
	    {
		case 'b': dir = BACKWARD; break;
		case 'w': p_ws = TRUE; break;
		case 'W': p_ws = FALSE; break;
		default:  mask = 0;
			  if (flagsp != NULL)
			     switch (*flags)
			     {
				 case 'c': mask = SP_START; break;
				 case 'e': mask = SP_END; break;
				 case 'm': mask = SP_RETCOUNT; break;
				 case 'n': mask = SP_NOMOVE; break;
				 case 'p': mask = SP_SUBPAT; break;
				 case 'r': mask = SP_REPEAT; break;
				 case 's': mask = SP_SETPCMARK; break;
				 case 'z': mask = SP_COLUMN; break;
			     }
			  if (mask == 0)
			  {
			      EMSG2(_(e_invarg2), flags);
			      dir = 0;
			  }
			  else
			      *flagsp |= mask;
	    }
	    if (dir == 0)
		break;
	    ++flags;
	}
    }
    return dir;
}

/*
 * Shared by search() and searchpos() functions.
 */
    static int
search_cmn(typval_T *argvars, pos_T *match_pos, int *flagsp)
{
    int		flags;
    char_u	*pat;
    pos_T	pos;
    pos_T	save_cursor;
    int		save_p_ws = p_ws;
    int		dir;
    int		retval = 0;	/* default: FAIL */
    long	lnum_stop = 0;
    proftime_T	tm;
#ifdef FEAT_RELTIME
    long	time_limit = 0;
#endif
    int		options = SEARCH_KEEP;
    int		subpatnum;

    pat = get_tv_string(&argvars[0]);
    dir = get_search_arg(&argvars[1], flagsp);	/* may set p_ws */
    if (dir == 0)
	goto theend;
    flags = *flagsp;
    if (flags & SP_START)
	options |= SEARCH_START;
    if (flags & SP_END)
	options |= SEARCH_END;
    if (flags & SP_COLUMN)
	options |= SEARCH_COL;

    /* Optional arguments: line number to stop searching and timeout. */
    if (argvars[1].v_type != VAR_UNKNOWN && argvars[2].v_type != VAR_UNKNOWN)
    {
	lnum_stop = get_tv_number_chk(&argvars[2], NULL);
	if (lnum_stop < 0)
	    goto theend;
#ifdef FEAT_RELTIME
	if (argvars[3].v_type != VAR_UNKNOWN)
	{
	    time_limit = get_tv_number_chk(&argvars[3], NULL);
	    if (time_limit < 0)
		goto theend;
	}
#endif
    }

#ifdef FEAT_RELTIME
    /* Set the time limit, if there is one. */
    profile_setlimit(time_limit, &tm);
#endif

    /*
     * This function does not accept SP_REPEAT and SP_RETCOUNT flags.
     * Check to make sure only those flags are set.
     * Also, Only the SP_NOMOVE or the SP_SETPCMARK flag can be set. Both
     * flags cannot be set. Check for that condition also.
     */
    if (((flags & (SP_REPEAT | SP_RETCOUNT)) != 0)
	    || ((flags & SP_NOMOVE) && (flags & SP_SETPCMARK)))
    {
	EMSG2(_(e_invarg2), get_tv_string(&argvars[1]));
	goto theend;
    }

    pos = save_cursor = curwin->w_cursor;
    subpatnum = searchit(curwin, curbuf, &pos, dir, pat, 1L,
				options, RE_SEARCH, (linenr_T)lnum_stop, &tm);
    if (subpatnum != FAIL)
    {
	if (flags & SP_SUBPAT)
	    retval = subpatnum;
	else
	    retval = pos.lnum;
	if (flags & SP_SETPCMARK)
	    setpcmark();
	curwin->w_cursor = pos;
	if (match_pos != NULL)
	{
	    /* Store the match cursor position */
	    match_pos->lnum = pos.lnum;
	    match_pos->col = pos.col + 1;
	}
	/* "/$" will put the cursor after the end of the line, may need to
	 * correct that here */
	check_cursor();
    }

    /* If 'n' flag is used: restore cursor position. */
    if (flags & SP_NOMOVE)
	curwin->w_cursor = save_cursor;
    else
	curwin->w_set_curswant = TRUE;
theend:
    p_ws = save_p_ws;

    return retval;
}

#ifdef FEAT_FLOAT

/*
 * round() is not in C90, use ceil() or floor() instead.
 */
    float_T
vim_round(float_T f)
{
    return f > 0 ? floor(f + 0.5) : ceil(f - 0.5);
}

/*
 * "round({float})" function
 */
    static void
f_round(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = vim_round(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "screenattr()" function
 */
    static void
f_screenattr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		row;
    int		col;
    int		c;

    row = get_tv_number_chk(&argvars[0], NULL) - 1;
    col = get_tv_number_chk(&argvars[1], NULL) - 1;
    if (row < 0 || row >= screen_Rows
	    || col < 0 || col >= screen_Columns)
	c = -1;
    else
	c = ScreenAttrs[LineOffset[row] + col];
    rettv->vval.v_number = c;
}

/*
 * "screenchar()" function
 */
    static void
f_screenchar(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		row;
    int		col;
    int		off;
    int		c;

    row = get_tv_number_chk(&argvars[0], NULL) - 1;
    col = get_tv_number_chk(&argvars[1], NULL) - 1;
    if (row < 0 || row >= screen_Rows
	    || col < 0 || col >= screen_Columns)
	c = -1;
    else
    {
	off = LineOffset[row] + col;
#ifdef FEAT_MBYTE
	if (enc_utf8 && ScreenLinesUC[off] != 0)
	    c = ScreenLinesUC[off];
	else
#endif
	    c = ScreenLines[off];
    }
    rettv->vval.v_number = c;
}

/*
 * "screencol()" function
 *
 * First column is 1 to be consistent with virtcol().
 */
    static void
f_screencol(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = screen_screencol() + 1;
}

/*
 * "screenrow()" function
 */
    static void
f_screenrow(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = screen_screenrow() + 1;
}

/*
 * "search()" function
 */
    static void
f_search(typval_T *argvars, typval_T *rettv)
{
    int		flags = 0;

    rettv->vval.v_number = search_cmn(argvars, NULL, &flags);
}

/*
 * "searchdecl()" function
 */
    static void
f_searchdecl(typval_T *argvars, typval_T *rettv)
{
    int		locally = 1;
    int		thisblock = 0;
    int		error = FALSE;
    char_u	*name;

    rettv->vval.v_number = 1;	/* default: FAIL */

    name = get_tv_string_chk(&argvars[0]);
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	locally = get_tv_number_chk(&argvars[1], &error) == 0;
	if (!error && argvars[2].v_type != VAR_UNKNOWN)
	    thisblock = get_tv_number_chk(&argvars[2], &error) != 0;
    }
    if (!error && name != NULL)
	rettv->vval.v_number = find_decl(name, (int)STRLEN(name),
				     locally, thisblock, SEARCH_KEEP) == FAIL;
}

/*
 * Used by searchpair() and searchpairpos()
 */
    static int
searchpair_cmn(typval_T *argvars, pos_T *match_pos)
{
    char_u	*spat, *mpat, *epat;
    char_u	*skip;
    int		save_p_ws = p_ws;
    int		dir;
    int		flags = 0;
    char_u	nbuf1[NUMBUFLEN];
    char_u	nbuf2[NUMBUFLEN];
    char_u	nbuf3[NUMBUFLEN];
    int		retval = 0;		/* default: FAIL */
    long	lnum_stop = 0;
    long	time_limit = 0;

    /* Get the three pattern arguments: start, middle, end. */
    spat = get_tv_string_chk(&argvars[0]);
    mpat = get_tv_string_buf_chk(&argvars[1], nbuf1);
    epat = get_tv_string_buf_chk(&argvars[2], nbuf2);
    if (spat == NULL || mpat == NULL || epat == NULL)
	goto theend;	    /* type error */

    /* Handle the optional fourth argument: flags */
    dir = get_search_arg(&argvars[3], &flags); /* may set p_ws */
    if (dir == 0)
	goto theend;

    /* Don't accept SP_END or SP_SUBPAT.
     * Only one of the SP_NOMOVE or SP_SETPCMARK flags can be set.
     */
    if ((flags & (SP_END | SP_SUBPAT)) != 0
	    || ((flags & SP_NOMOVE) && (flags & SP_SETPCMARK)))
    {
	EMSG2(_(e_invarg2), get_tv_string(&argvars[3]));
	goto theend;
    }

    /* Using 'r' implies 'W', otherwise it doesn't work. */
    if (flags & SP_REPEAT)
	p_ws = FALSE;

    /* Optional fifth argument: skip expression */
    if (argvars[3].v_type == VAR_UNKNOWN
	    || argvars[4].v_type == VAR_UNKNOWN)
	skip = (char_u *)"";
    else
    {
	skip = get_tv_string_buf_chk(&argvars[4], nbuf3);
	if (argvars[5].v_type != VAR_UNKNOWN)
	{
	    lnum_stop = get_tv_number_chk(&argvars[5], NULL);
	    if (lnum_stop < 0)
		goto theend;
#ifdef FEAT_RELTIME
	    if (argvars[6].v_type != VAR_UNKNOWN)
	    {
		time_limit = get_tv_number_chk(&argvars[6], NULL);
		if (time_limit < 0)
		    goto theend;
	    }
#endif
	}
    }
    if (skip == NULL)
	goto theend;	    /* type error */

    retval = do_searchpair(spat, mpat, epat, dir, skip, flags,
					    match_pos, lnum_stop, time_limit);

theend:
    p_ws = save_p_ws;

    return retval;
}

/*
 * "searchpair()" function
 */
    static void
f_searchpair(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = searchpair_cmn(argvars, NULL);
}

/*
 * "searchpairpos()" function
 */
    static void
f_searchpairpos(typval_T *argvars, typval_T *rettv)
{
    pos_T	match_pos;
    int		lnum = 0;
    int		col = 0;

    if (rettv_list_alloc(rettv) == FAIL)
	return;

    if (searchpair_cmn(argvars, &match_pos) > 0)
    {
	lnum = match_pos.lnum;
	col = match_pos.col;
    }

    list_append_number(rettv->vval.v_list, (varnumber_T)lnum);
    list_append_number(rettv->vval.v_list, (varnumber_T)col);
}

/*
 * Search for a start/middle/end thing.
 * Used by searchpair(), see its documentation for the details.
 * Returns 0 or -1 for no match,
 */
    long
do_searchpair(
    char_u	*spat,	    /* start pattern */
    char_u	*mpat,	    /* middle pattern */
    char_u	*epat,	    /* end pattern */
    int		dir,	    /* BACKWARD or FORWARD */
    char_u	*skip,	    /* skip expression */
    int		flags,	    /* SP_SETPCMARK and other SP_ values */
    pos_T	*match_pos,
    linenr_T	lnum_stop,  /* stop at this line if not zero */
    long	time_limit UNUSED) /* stop after this many msec */
{
    char_u	*save_cpo;
    char_u	*pat, *pat2 = NULL, *pat3 = NULL;
    long	retval = 0;
    pos_T	pos;
    pos_T	firstpos;
    pos_T	foundpos;
    pos_T	save_cursor;
    pos_T	save_pos;
    int		n;
    int		r;
    int		nest = 1;
    int		err;
    int		options = SEARCH_KEEP;
    proftime_T	tm;

    /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
    save_cpo = p_cpo;
    p_cpo = empty_option;

#ifdef FEAT_RELTIME
    /* Set the time limit, if there is one. */
    profile_setlimit(time_limit, &tm);
#endif

    /* Make two search patterns: start/end (pat2, for in nested pairs) and
     * start/middle/end (pat3, for the top pair). */
    pat2 = alloc((unsigned)(STRLEN(spat) + STRLEN(epat) + 15));
    pat3 = alloc((unsigned)(STRLEN(spat) + STRLEN(mpat) + STRLEN(epat) + 23));
    if (pat2 == NULL || pat3 == NULL)
	goto theend;
    sprintf((char *)pat2, "\\(%s\\m\\)\\|\\(%s\\m\\)", spat, epat);
    if (*mpat == NUL)
	STRCPY(pat3, pat2);
    else
	sprintf((char *)pat3, "\\(%s\\m\\)\\|\\(%s\\m\\)\\|\\(%s\\m\\)",
							    spat, epat, mpat);
    if (flags & SP_START)
	options |= SEARCH_START;

    save_cursor = curwin->w_cursor;
    pos = curwin->w_cursor;
    clearpos(&firstpos);
    clearpos(&foundpos);
    pat = pat3;
    for (;;)
    {
	n = searchit(curwin, curbuf, &pos, dir, pat, 1L,
					   options, RE_SEARCH, lnum_stop, &tm);
	if (n == FAIL || (firstpos.lnum != 0 && equalpos(pos, firstpos)))
	    /* didn't find it or found the first match again: FAIL */
	    break;

	if (firstpos.lnum == 0)
	    firstpos = pos;
	if (equalpos(pos, foundpos))
	{
	    /* Found the same position again.  Can happen with a pattern that
	     * has "\zs" at the end and searching backwards.  Advance one
	     * character and try again. */
	    if (dir == BACKWARD)
		decl(&pos);
	    else
		incl(&pos);
	}
	foundpos = pos;

	/* clear the start flag to avoid getting stuck here */
	options &= ~SEARCH_START;

	/* If the skip pattern matches, ignore this match. */
	if (*skip != NUL)
	{
	    save_pos = curwin->w_cursor;
	    curwin->w_cursor = pos;
	    r = eval_to_bool(skip, &err, NULL, FALSE);
	    curwin->w_cursor = save_pos;
	    if (err)
	    {
		/* Evaluating {skip} caused an error, break here. */
		curwin->w_cursor = save_cursor;
		retval = -1;
		break;
	    }
	    if (r)
		continue;
	}

	if ((dir == BACKWARD && n == 3) || (dir == FORWARD && n == 2))
	{
	    /* Found end when searching backwards or start when searching
	     * forward: nested pair. */
	    ++nest;
	    pat = pat2;		/* nested, don't search for middle */
	}
	else
	{
	    /* Found end when searching forward or start when searching
	     * backward: end of (nested) pair; or found middle in outer pair. */
	    if (--nest == 1)
		pat = pat3;	/* outer level, search for middle */
	}

	if (nest == 0)
	{
	    /* Found the match: return matchcount or line number. */
	    if (flags & SP_RETCOUNT)
		++retval;
	    else
		retval = pos.lnum;
	    if (flags & SP_SETPCMARK)
		setpcmark();
	    curwin->w_cursor = pos;
	    if (!(flags & SP_REPEAT))
		break;
	    nest = 1;	    /* search for next unmatched */
	}
    }

    if (match_pos != NULL)
    {
	/* Store the match cursor position */
	match_pos->lnum = curwin->w_cursor.lnum;
	match_pos->col = curwin->w_cursor.col + 1;
    }

    /* If 'n' flag is used or search failed: restore cursor position. */
    if ((flags & SP_NOMOVE) || retval == 0)
	curwin->w_cursor = save_cursor;

theend:
    vim_free(pat2);
    vim_free(pat3);
    if (p_cpo == empty_option)
	p_cpo = save_cpo;
    else
	/* Darn, evaluating the {skip} expression changed the value. */
	free_string_option(save_cpo);

    return retval;
}

/*
 * "searchpos()" function
 */
    static void
f_searchpos(typval_T *argvars, typval_T *rettv)
{
    pos_T	match_pos;
    int		lnum = 0;
    int		col = 0;
    int		n;
    int		flags = 0;

    if (rettv_list_alloc(rettv) == FAIL)
	return;

    n = search_cmn(argvars, &match_pos, &flags);
    if (n > 0)
    {
	lnum = match_pos.lnum;
	col = match_pos.col;
    }

    list_append_number(rettv->vval.v_list, (varnumber_T)lnum);
    list_append_number(rettv->vval.v_list, (varnumber_T)col);
    if (flags & SP_SUBPAT)
	list_append_number(rettv->vval.v_list, (varnumber_T)n);
}

    static void
f_server2client(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_CLIENTSERVER
    char_u	buf[NUMBUFLEN];
    char_u	*server = get_tv_string_chk(&argvars[0]);
    char_u	*reply = get_tv_string_buf_chk(&argvars[1], buf);

    rettv->vval.v_number = -1;
    if (server == NULL || reply == NULL)
	return;
    if (check_restricted() || check_secure())
	return;
# ifdef FEAT_X11
    if (check_connection() == FAIL)
	return;
# endif

    if (serverSendReply(server, reply) < 0)
    {
	EMSG(_("E258: Unable to send to client"));
	return;
    }
    rettv->vval.v_number = 0;
#else
    rettv->vval.v_number = -1;
#endif
}

    static void
f_serverlist(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*r = NULL;

#ifdef FEAT_CLIENTSERVER
# ifdef WIN32
    r = serverGetVimNames();
# else
    make_connection();
    if (X_DISPLAY != NULL)
	r = serverGetVimNames(X_DISPLAY);
# endif
#endif
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = r;
}

/*
 * "setbufvar()" function
 */
    static void
f_setbufvar(typval_T *argvars, typval_T *rettv UNUSED)
{
    buf_T	*buf;
    aco_save_T	aco;
    char_u	*varname, *bufvarname;
    typval_T	*varp;
    char_u	nbuf[NUMBUFLEN];

    if (check_restricted() || check_secure())
	return;
    (void)get_tv_number(&argvars[0]);	    /* issue errmsg if type error */
    varname = get_tv_string_chk(&argvars[1]);
    buf = get_buf_tv(&argvars[0], FALSE);
    varp = &argvars[2];

    if (buf != NULL && varname != NULL && varp != NULL)
    {
	/* set curbuf to be our buf, temporarily */
	aucmd_prepbuf(&aco, buf);

	if (*varname == '&')
	{
	    long	numval;
	    char_u	*strval;
	    int		error = FALSE;

	    ++varname;
	    numval = get_tv_number_chk(varp, &error);
	    strval = get_tv_string_buf_chk(varp, nbuf);
	    if (!error && strval != NULL)
		set_option_value(varname, numval, strval, OPT_LOCAL);
	}
	else
	{
	    bufvarname = alloc((unsigned)STRLEN(varname) + 3);
	    if (bufvarname != NULL)
	    {
		STRCPY(bufvarname, "b:");
		STRCPY(bufvarname + 2, varname);
		set_var(bufvarname, varp, TRUE);
		vim_free(bufvarname);
	    }
	}

	/* reset notion of buffer */
	aucmd_restbuf(&aco);
    }
}

    static void
f_setcharsearch(typval_T *argvars, typval_T *rettv UNUSED)
{
    dict_T	*d;
    dictitem_T	*di;
    char_u	*csearch;

    if (argvars[0].v_type != VAR_DICT)
    {
	EMSG(_(e_dictreq));
	return;
    }

    if ((d = argvars[0].vval.v_dict) != NULL)
    {
	csearch = get_dict_string(d, (char_u *)"char", FALSE);
	if (csearch != NULL)
	{
#ifdef FEAT_MBYTE
	    if (enc_utf8)
	    {
		int pcc[MAX_MCO];
		int c = utfc_ptr2char(csearch, pcc);

		set_last_csearch(c, csearch, utfc_ptr2len(csearch));
	    }
	    else
#endif
		set_last_csearch(PTR2CHAR(csearch),
						csearch, MB_PTR2LEN(csearch));
	}

	di = dict_find(d, (char_u *)"forward", -1);
	if (di != NULL)
	    set_csearch_direction(get_tv_number(&di->di_tv)
							? FORWARD : BACKWARD);

	di = dict_find(d, (char_u *)"until", -1);
	if (di != NULL)
	    set_csearch_until(!!get_tv_number(&di->di_tv));
    }
}

/*
 * "setcmdpos()" function
 */
    static void
f_setcmdpos(typval_T *argvars, typval_T *rettv)
{
    int		pos = (int)get_tv_number(&argvars[0]) - 1;

    if (pos >= 0)
	rettv->vval.v_number = set_cmdline_pos(pos);
}

/*
 * "setline()" function
 */
    static void
f_setline(typval_T *argvars, typval_T *rettv)
{
    linenr_T	lnum;
    char_u	*line = NULL;
    list_T	*l = NULL;
    listitem_T	*li = NULL;
    long	added = 0;
    linenr_T	lcount = curbuf->b_ml.ml_line_count;

    lnum = get_tv_lnum(&argvars[0]);
    if (argvars[1].v_type == VAR_LIST)
    {
	l = argvars[1].vval.v_list;
	li = l->lv_first;
    }
    else
	line = get_tv_string_chk(&argvars[1]);

    /* default result is zero == OK */
    for (;;)
    {
	if (l != NULL)
	{
	    /* list argument, get next string */
	    if (li == NULL)
		break;
	    line = get_tv_string_chk(&li->li_tv);
	    li = li->li_next;
	}

	rettv->vval.v_number = 1;	/* FAIL */
	if (line == NULL || lnum < 1 || lnum > curbuf->b_ml.ml_line_count + 1)
	    break;

	/* When coming here from Insert mode, sync undo, so that this can be
	 * undone separately from what was previously inserted. */
	if (u_sync_once == 2)
	{
	    u_sync_once = 1; /* notify that u_sync() was called */
	    u_sync(TRUE);
	}

	if (lnum <= curbuf->b_ml.ml_line_count)
	{
	    /* existing line, replace it */
	    if (u_savesub(lnum) == OK && ml_replace(lnum, line, TRUE) == OK)
	    {
		changed_bytes(lnum, 0);
		if (lnum == curwin->w_cursor.lnum)
		    check_cursor_col();
		rettv->vval.v_number = 0;	/* OK */
	    }
	}
	else if (added > 0 || u_save(lnum - 1, lnum) == OK)
	{
	    /* lnum is one past the last line, append the line */
	    ++added;
	    if (ml_append(lnum - 1, line, (colnr_T)0, FALSE) == OK)
		rettv->vval.v_number = 0;	/* OK */
	}

	if (l == NULL)			/* only one string argument */
	    break;
	++lnum;
    }

    if (added > 0)
	appended_lines_mark(lcount, added);
}

static void set_qf_ll_list(win_T *wp, typval_T *list_arg, typval_T *action_arg, typval_T *rettv);

/*
 * Used by "setqflist()" and "setloclist()" functions
 */
    static void
set_qf_ll_list(
    win_T	*wp UNUSED,
    typval_T	*list_arg UNUSED,
    typval_T	*action_arg UNUSED,
    typval_T	*rettv)
{
#ifdef FEAT_QUICKFIX
    char_u	*act;
    int		action = ' ';
#endif

    rettv->vval.v_number = -1;

#ifdef FEAT_QUICKFIX
    if (list_arg->v_type != VAR_LIST)
	EMSG(_(e_listreq));
    else
    {
	list_T  *l = list_arg->vval.v_list;

	if (action_arg->v_type == VAR_STRING)
	{
	    act = get_tv_string_chk(action_arg);
	    if (act == NULL)
		return;		/* type error; errmsg already given */
	    if (*act == 'a' || *act == 'r')
		action = *act;
	}

	if (l != NULL && set_errorlist(wp, l, action,
	       (char_u *)(wp == NULL ? "setqflist()" : "setloclist()")) == OK)
	    rettv->vval.v_number = 0;
    }
#endif
}

/*
 * "setloclist()" function
 */
    static void
f_setloclist(typval_T *argvars, typval_T *rettv)
{
    win_T	*win;

    rettv->vval.v_number = -1;

    win = find_win_by_nr(&argvars[0], NULL);
    if (win != NULL)
	set_qf_ll_list(win, &argvars[1], &argvars[2], rettv);
}

/*
 * "setmatches()" function
 */
    static void
f_setmatches(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_SEARCH_EXTRA
    list_T	*l;
    listitem_T	*li;
    dict_T	*d;
    list_T	*s = NULL;

    rettv->vval.v_number = -1;
    if (argvars[0].v_type != VAR_LIST)
    {
	EMSG(_(e_listreq));
	return;
    }
    if ((l = argvars[0].vval.v_list) != NULL)
    {

	/* To some extent make sure that we are dealing with a list from
	 * "getmatches()". */
	li = l->lv_first;
	while (li != NULL)
	{
	    if (li->li_tv.v_type != VAR_DICT
		    || (d = li->li_tv.vval.v_dict) == NULL)
	    {
		EMSG(_(e_invarg));
		return;
	    }
	    if (!(dict_find(d, (char_u *)"group", -1) != NULL
			&& (dict_find(d, (char_u *)"pattern", -1) != NULL
			    || dict_find(d, (char_u *)"pos1", -1) != NULL)
			&& dict_find(d, (char_u *)"priority", -1) != NULL
			&& dict_find(d, (char_u *)"id", -1) != NULL))
	    {
		EMSG(_(e_invarg));
		return;
	    }
	    li = li->li_next;
	}

	clear_matches(curwin);
	li = l->lv_first;
	while (li != NULL)
	{
	    int		i = 0;
	    char_u	buf[5];
	    dictitem_T  *di;
	    char_u	*group;
	    int		priority;
	    int		id;
	    char_u	*conceal;

	    d = li->li_tv.vval.v_dict;
	    if (dict_find(d, (char_u *)"pattern", -1) == NULL)
	    {
		if (s == NULL)
		{
		    s = list_alloc();
		    if (s == NULL)
			return;
		}

		/* match from matchaddpos() */
		for (i = 1; i < 9; i++)
		{
		    sprintf((char *)buf, (char *)"pos%d", i);
		    if ((di = dict_find(d, (char_u *)buf, -1)) != NULL)
		    {
			if (di->di_tv.v_type != VAR_LIST)
			    return;

			list_append_tv(s, &di->di_tv);
			s->lv_refcount++;
		    }
		    else
			break;
		}
	    }

	    group = get_dict_string(d, (char_u *)"group", FALSE);
	    priority = (int)get_dict_number(d, (char_u *)"priority");
	    id = (int)get_dict_number(d, (char_u *)"id");
	    conceal = dict_find(d, (char_u *)"conceal", -1) != NULL
			      ? get_dict_string(d, (char_u *)"conceal", FALSE)
			      : NULL;
	    if (i == 0)
	    {
		match_add(curwin, group,
		    get_dict_string(d, (char_u *)"pattern", FALSE),
		    priority, id, NULL, conceal);
	    }
	    else
	    {
		match_add(curwin, group, NULL, priority, id, s, conceal);
		list_unref(s);
		s = NULL;
	    }

	    li = li->li_next;
	}
	rettv->vval.v_number = 0;
    }
#endif
}

/*
 * "setpos()" function
 */
    static void
f_setpos(typval_T *argvars, typval_T *rettv)
{
    pos_T	pos;
    int		fnum;
    char_u	*name;
    colnr_T	curswant = -1;

    rettv->vval.v_number = -1;
    name = get_tv_string_chk(argvars);
    if (name != NULL)
    {
	if (list2fpos(&argvars[1], &pos, &fnum, &curswant) == OK)
	{
	    if (--pos.col < 0)
		pos.col = 0;
	    if (name[0] == '.' && name[1] == NUL)
	    {
		/* set cursor */
		if (fnum == curbuf->b_fnum)
		{
		    curwin->w_cursor = pos;
		    if (curswant >= 0)
		    {
			curwin->w_curswant = curswant - 1;
			curwin->w_set_curswant = FALSE;
		    }
		    check_cursor();
		    rettv->vval.v_number = 0;
		}
		else
		    EMSG(_(e_invarg));
	    }
	    else if (name[0] == '\'' && name[1] != NUL && name[2] == NUL)
	    {
		/* set mark */
		if (setmark_pos(name[1], &pos, fnum) == OK)
		    rettv->vval.v_number = 0;
	    }
	    else
		EMSG(_(e_invarg));
	}
    }
}

/*
 * "setqflist()" function
 */
    static void
f_setqflist(typval_T *argvars, typval_T *rettv)
{
    set_qf_ll_list(NULL, &argvars[0], &argvars[1], rettv);
}

/*
 * "setreg()" function
 */
    static void
f_setreg(typval_T *argvars, typval_T *rettv)
{
    int		regname;
    char_u	*strregname;
    char_u	*stropt;
    char_u	*strval;
    int		append;
    char_u	yank_type;
    long	block_len;

    block_len = -1;
    yank_type = MAUTO;
    append = FALSE;

    strregname = get_tv_string_chk(argvars);
    rettv->vval.v_number = 1;		/* FAIL is default */

    if (strregname == NULL)
	return;		/* type error; errmsg already given */
    regname = *strregname;
    if (regname == 0 || regname == '@')
	regname = '"';

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	stropt = get_tv_string_chk(&argvars[2]);
	if (stropt == NULL)
	    return;		/* type error */
	for (; *stropt != NUL; ++stropt)
	    switch (*stropt)
	    {
		case 'a': case 'A':	/* append */
		    append = TRUE;
		    break;
		case 'v': case 'c':	/* character-wise selection */
		    yank_type = MCHAR;
		    break;
		case 'V': case 'l':	/* line-wise selection */
		    yank_type = MLINE;
		    break;
		case 'b': case Ctrl_V:	/* block-wise selection */
		    yank_type = MBLOCK;
		    if (VIM_ISDIGIT(stropt[1]))
		    {
			++stropt;
			block_len = getdigits(&stropt) - 1;
			--stropt;
		    }
		    break;
	    }
    }

    if (argvars[1].v_type == VAR_LIST)
    {
	char_u		**lstval;
	char_u		**allocval;
	char_u		buf[NUMBUFLEN];
	char_u		**curval;
	char_u		**curallocval;
	int		len = argvars[1].vval.v_list->lv_len;
	listitem_T	*li;

	/* First half: use for pointers to result lines; second half: use for
	 * pointers to allocated copies. */
	lstval = (char_u **)alloc(sizeof(char_u *) * ((len + 1) * 2));
	if (lstval == NULL)
	    return;
	curval = lstval;
	allocval = lstval + len + 2;
	curallocval = allocval;

	for (li = argvars[1].vval.v_list->lv_first; li != NULL;
							     li = li->li_next)
	{
	    strval = get_tv_string_buf_chk(&li->li_tv, buf);
	    if (strval == NULL)
		goto free_lstval;
	    if (strval == buf)
	    {
		/* Need to make a copy, next get_tv_string_buf_chk() will
		 * overwrite the string. */
		strval = vim_strsave(buf);
		if (strval == NULL)
		    goto free_lstval;
		*curallocval++ = strval;
	    }
	    *curval++ = strval;
	}
	*curval++ = NULL;

	write_reg_contents_lst(regname, lstval, -1,
						append, yank_type, block_len);
free_lstval:
	while (curallocval > allocval)
	    vim_free(*--curallocval);
	vim_free(lstval);
    }
    else
    {
	strval = get_tv_string_chk(&argvars[1]);
	if (strval == NULL)
	    return;
	write_reg_contents_ex(regname, strval, -1,
						append, yank_type, block_len);
    }
    rettv->vval.v_number = 0;
}

/*
 * "settabvar()" function
 */
    static void
f_settabvar(typval_T *argvars, typval_T *rettv)
{
#ifdef FEAT_WINDOWS
    tabpage_T	*save_curtab;
    tabpage_T	*tp;
#endif
    char_u	*varname, *tabvarname;
    typval_T	*varp;

    rettv->vval.v_number = 0;

    if (check_restricted() || check_secure())
	return;

#ifdef FEAT_WINDOWS
    tp = find_tabpage((int)get_tv_number_chk(&argvars[0], NULL));
#endif
    varname = get_tv_string_chk(&argvars[1]);
    varp = &argvars[2];

    if (varname != NULL && varp != NULL
#ifdef FEAT_WINDOWS
	    && tp != NULL
#endif
	    )
    {
#ifdef FEAT_WINDOWS
	save_curtab = curtab;
	goto_tabpage_tp(tp, FALSE, FALSE);
#endif

	tabvarname = alloc((unsigned)STRLEN(varname) + 3);
	if (tabvarname != NULL)
	{
	    STRCPY(tabvarname, "t:");
	    STRCPY(tabvarname + 2, varname);
	    set_var(tabvarname, varp, TRUE);
	    vim_free(tabvarname);
	}

#ifdef FEAT_WINDOWS
	/* Restore current tabpage */
	if (valid_tabpage(save_curtab))
	    goto_tabpage_tp(save_curtab, FALSE, FALSE);
#endif
    }
}

/*
 * "settabwinvar()" function
 */
    static void
f_settabwinvar(typval_T *argvars, typval_T *rettv)
{
    setwinvar(argvars, rettv, 1);
}

/*
 * "setwinvar()" function
 */
    static void
f_setwinvar(typval_T *argvars, typval_T *rettv)
{
    setwinvar(argvars, rettv, 0);
}

/*
 * "setwinvar()" and "settabwinvar()" functions
 */

    static void
setwinvar(typval_T *argvars, typval_T *rettv UNUSED, int off)
{
    win_T	*win;
#ifdef FEAT_WINDOWS
    win_T	*save_curwin;
    tabpage_T	*save_curtab;
    int		need_switch_win;
#endif
    char_u	*varname, *winvarname;
    typval_T	*varp;
    char_u	nbuf[NUMBUFLEN];
    tabpage_T	*tp = NULL;

    if (check_restricted() || check_secure())
	return;

#ifdef FEAT_WINDOWS
    if (off == 1)
	tp = find_tabpage((int)get_tv_number_chk(&argvars[0], NULL));
    else
	tp = curtab;
#endif
    win = find_win_by_nr(&argvars[off], tp);
    varname = get_tv_string_chk(&argvars[off + 1]);
    varp = &argvars[off + 2];

    if (win != NULL && varname != NULL && varp != NULL)
    {
#ifdef FEAT_WINDOWS
	need_switch_win = !(tp == curtab && win == curwin);
	if (!need_switch_win
	       || switch_win(&save_curwin, &save_curtab, win, tp, TRUE) == OK)
#endif
	{
	    if (*varname == '&')
	    {
		long	numval;
		char_u	*strval;
		int		error = FALSE;

		++varname;
		numval = get_tv_number_chk(varp, &error);
		strval = get_tv_string_buf_chk(varp, nbuf);
		if (!error && strval != NULL)
		    set_option_value(varname, numval, strval, OPT_LOCAL);
	    }
	    else
	    {
		winvarname = alloc((unsigned)STRLEN(varname) + 3);
		if (winvarname != NULL)
		{
		    STRCPY(winvarname, "w:");
		    STRCPY(winvarname + 2, varname);
		    set_var(winvarname, varp, TRUE);
		    vim_free(winvarname);
		}
	    }
	}
#ifdef FEAT_WINDOWS
	if (need_switch_win)
	    restore_win(save_curwin, save_curtab, TRUE);
#endif
    }
}

#ifdef FEAT_CRYPT
/*
 * "sha256({string})" function
 */
    static void
f_sha256(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;

    p = get_tv_string(&argvars[0]);
    rettv->vval.v_string = vim_strsave(
				    sha256_bytes(p, (int)STRLEN(p), NULL, 0));
    rettv->v_type = VAR_STRING;
}
#endif /* FEAT_CRYPT */

/*
 * "shellescape({string})" function
 */
    static void
f_shellescape(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_string = vim_strsave_shellescape(
		get_tv_string(&argvars[0]), non_zero_arg(&argvars[1]), TRUE);
    rettv->v_type = VAR_STRING;
}

/*
 * shiftwidth() function
 */
    static void
f_shiftwidth(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->vval.v_number = get_sw_value(curbuf);
}

/*
 * "simplify()" function
 */
    static void
f_simplify(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;

    p = get_tv_string(&argvars[0]);
    rettv->vval.v_string = vim_strsave(p);
    simplify_filename(rettv->vval.v_string);	/* simplify in place */
    rettv->v_type = VAR_STRING;
}

#ifdef FEAT_FLOAT
/*
 * "sin()" function
 */
    static void
f_sin(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = sin(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "sinh()" function
 */
    static void
f_sinh(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = sinh(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

static int
#ifdef __BORLANDC__
    _RTLENTRYF
#endif
	item_compare(const void *s1, const void *s2);
static int
#ifdef __BORLANDC__
    _RTLENTRYF
#endif
	item_compare2(const void *s1, const void *s2);

/* struct used in the array that's given to qsort() */
typedef struct
{
    listitem_T	*item;
    int		idx;
} sortItem_T;

static int	item_compare_ic;
static int	item_compare_numeric;
static int	item_compare_numbers;
#ifdef FEAT_FLOAT
static int	item_compare_float;
#endif
static char_u	*item_compare_func;
static dict_T	*item_compare_selfdict;
static int	item_compare_func_err;
static int	item_compare_keep_zero;
static void	do_sort_uniq(typval_T *argvars, typval_T *rettv, int sort);
#define ITEM_COMPARE_FAIL 999

/*
 * Compare functions for f_sort() and f_uniq() below.
 */
    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
item_compare(const void *s1, const void *s2)
{
    sortItem_T  *si1, *si2;
    typval_T	*tv1, *tv2;
    char_u	*p1, *p2;
    char_u	*tofree1 = NULL, *tofree2 = NULL;
    int		res;
    char_u	numbuf1[NUMBUFLEN];
    char_u	numbuf2[NUMBUFLEN];

    si1 = (sortItem_T *)s1;
    si2 = (sortItem_T *)s2;
    tv1 = &si1->item->li_tv;
    tv2 = &si2->item->li_tv;

    if (item_compare_numbers)
    {
	long	v1 = get_tv_number(tv1);
	long	v2 = get_tv_number(tv2);

	return v1 == v2 ? 0 : v1 > v2 ? 1 : -1;
    }

#ifdef FEAT_FLOAT
    if (item_compare_float)
    {
	float_T	v1 = get_tv_float(tv1);
	float_T	v2 = get_tv_float(tv2);

	return v1 == v2 ? 0 : v1 > v2 ? 1 : -1;
    }
#endif

    /* tv2string() puts quotes around a string and allocates memory.  Don't do
     * that for string variables. Use a single quote when comparing with a
     * non-string to do what the docs promise. */
    if (tv1->v_type == VAR_STRING)
    {
	if (tv2->v_type != VAR_STRING || item_compare_numeric)
	    p1 = (char_u *)"'";
	else
	    p1 = tv1->vval.v_string;
    }
    else
	p1 = tv2string(tv1, &tofree1, numbuf1, 0);
    if (tv2->v_type == VAR_STRING)
    {
	if (tv1->v_type != VAR_STRING || item_compare_numeric)
	    p2 = (char_u *)"'";
	else
	    p2 = tv2->vval.v_string;
    }
    else
	p2 = tv2string(tv2, &tofree2, numbuf2, 0);
    if (p1 == NULL)
	p1 = (char_u *)"";
    if (p2 == NULL)
	p2 = (char_u *)"";
    if (!item_compare_numeric)
    {
	if (item_compare_ic)
	    res = STRICMP(p1, p2);
	else
	    res = STRCMP(p1, p2);
    }
    else
    {
	double n1, n2;
	n1 = strtod((char *)p1, (char **)&p1);
	n2 = strtod((char *)p2, (char **)&p2);
	res = n1 == n2 ? 0 : n1 > n2 ? 1 : -1;
    }

    /* When the result would be zero, compare the item indexes.  Makes the
     * sort stable. */
    if (res == 0 && !item_compare_keep_zero)
	res = si1->idx > si2->idx ? 1 : -1;

    vim_free(tofree1);
    vim_free(tofree2);
    return res;
}

    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
item_compare2(const void *s1, const void *s2)
{
    sortItem_T  *si1, *si2;
    int		res;
    typval_T	rettv;
    typval_T	argv[3];
    int		dummy;

    /* shortcut after failure in previous call; compare all items equal */
    if (item_compare_func_err)
	return 0;

    si1 = (sortItem_T *)s1;
    si2 = (sortItem_T *)s2;

    /* Copy the values.  This is needed to be able to set v_lock to VAR_FIXED
     * in the copy without changing the original list items. */
    copy_tv(&si1->item->li_tv, &argv[0]);
    copy_tv(&si2->item->li_tv, &argv[1]);

    rettv.v_type = VAR_UNKNOWN;		/* clear_tv() uses this */
    res = call_func(item_compare_func, (int)STRLEN(item_compare_func),
				 &rettv, 2, argv, 0L, 0L, &dummy, TRUE,
				 item_compare_selfdict);
    clear_tv(&argv[0]);
    clear_tv(&argv[1]);

    if (res == FAIL)
	res = ITEM_COMPARE_FAIL;
    else
	res = get_tv_number_chk(&rettv, &item_compare_func_err);
    if (item_compare_func_err)
	res = ITEM_COMPARE_FAIL;  /* return value has wrong type */
    clear_tv(&rettv);

    /* When the result would be zero, compare the pointers themselves.  Makes
     * the sort stable. */
    if (res == 0 && !item_compare_keep_zero)
	res = si1->idx > si2->idx ? 1 : -1;

    return res;
}

/*
 * "sort({list})" function
 */
    static void
do_sort_uniq(typval_T *argvars, typval_T *rettv, int sort)
{
    list_T	*l;
    listitem_T	*li;
    sortItem_T	*ptrs;
    long	len;
    long	i;

    if (argvars[0].v_type != VAR_LIST)
	EMSG2(_(e_listarg), sort ? "sort()" : "uniq()");
    else
    {
	l = argvars[0].vval.v_list;
	if (l == NULL || tv_check_lock(l->lv_lock,
	     (char_u *)(sort ? N_("sort() argument") : N_("uniq() argument")),
									TRUE))
	    return;
	rettv->vval.v_list = l;
	rettv->v_type = VAR_LIST;
	++l->lv_refcount;

	len = list_len(l);
	if (len <= 1)
	    return;	/* short list sorts pretty quickly */

	item_compare_ic = FALSE;
	item_compare_numeric = FALSE;
	item_compare_numbers = FALSE;
#ifdef FEAT_FLOAT
	item_compare_float = FALSE;
#endif
	item_compare_func = NULL;
	item_compare_selfdict = NULL;
	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    /* optional second argument: {func} */
	    if (argvars[1].v_type == VAR_FUNC)
		item_compare_func = argvars[1].vval.v_string;
	    else
	    {
		int	    error = FALSE;

		i = get_tv_number_chk(&argvars[1], &error);
		if (error)
		    return;		/* type error; errmsg already given */
		if (i == 1)
		    item_compare_ic = TRUE;
		else
		    item_compare_func = get_tv_string(&argvars[1]);
		if (item_compare_func != NULL)
		{
		    if (STRCMP(item_compare_func, "n") == 0)
		    {
			item_compare_func = NULL;
			item_compare_numeric = TRUE;
		    }
		    else if (STRCMP(item_compare_func, "N") == 0)
		    {
			item_compare_func = NULL;
			item_compare_numbers = TRUE;
		    }
#ifdef FEAT_FLOAT
		    else if (STRCMP(item_compare_func, "f") == 0)
		    {
			item_compare_func = NULL;
			item_compare_float = TRUE;
		    }
#endif
		    else if (STRCMP(item_compare_func, "i") == 0)
		    {
			item_compare_func = NULL;
			item_compare_ic = TRUE;
		    }
		}
	    }

	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		/* optional third argument: {dict} */
		if (argvars[2].v_type != VAR_DICT)
		{
		    EMSG(_(e_dictreq));
		    return;
		}
		item_compare_selfdict = argvars[2].vval.v_dict;
	    }
	}

	/* Make an array with each entry pointing to an item in the List. */
	ptrs = (sortItem_T *)alloc((int)(len * sizeof(sortItem_T)));
	if (ptrs == NULL)
	    return;

	i = 0;
	if (sort)
	{
	    /* sort(): ptrs will be the list to sort */
	    for (li = l->lv_first; li != NULL; li = li->li_next)
	    {
		ptrs[i].item = li;
		ptrs[i].idx = i;
		++i;
	    }

	    item_compare_func_err = FALSE;
	    item_compare_keep_zero = FALSE;
	    /* test the compare function */
	    if (item_compare_func != NULL
		    && item_compare2((void *)&ptrs[0], (void *)&ptrs[1])
							 == ITEM_COMPARE_FAIL)
		EMSG(_("E702: Sort compare function failed"));
	    else
	    {
		/* Sort the array with item pointers. */
		qsort((void *)ptrs, (size_t)len, sizeof(sortItem_T),
		    item_compare_func == NULL ? item_compare : item_compare2);

		if (!item_compare_func_err)
		{
		    /* Clear the List and append the items in sorted order. */
		    l->lv_first = l->lv_last = l->lv_idx_item = NULL;
		    l->lv_len = 0;
		    for (i = 0; i < len; ++i)
			list_append(l, ptrs[i].item);
		}
	    }
	}
	else
	{
	    int	(*item_compare_func_ptr)(const void *, const void *);

	    /* f_uniq(): ptrs will be a stack of items to remove */
	    item_compare_func_err = FALSE;
	    item_compare_keep_zero = TRUE;
	    item_compare_func_ptr = item_compare_func
					       ? item_compare2 : item_compare;

	    for (li = l->lv_first; li != NULL && li->li_next != NULL;
							     li = li->li_next)
	    {
		if (item_compare_func_ptr((void *)&li, (void *)&li->li_next)
									 == 0)
		    ptrs[i++].item = li;
		if (item_compare_func_err)
		{
		    EMSG(_("E882: Uniq compare function failed"));
		    break;
		}
	    }

	    if (!item_compare_func_err)
	    {
		while (--i >= 0)
		{
		    li = ptrs[i].item->li_next;
		    ptrs[i].item->li_next = li->li_next;
		    if (li->li_next != NULL)
			li->li_next->li_prev = ptrs[i].item;
		    else
			l->lv_last = ptrs[i].item;
		    list_fix_watch(l, li);
		    listitem_free(li);
		    l->lv_len--;
		}
	    }
	}

	vim_free(ptrs);
    }
}

/*
 * "sort({list})" function
 */
    static void
f_sort(typval_T *argvars, typval_T *rettv)
{
    do_sort_uniq(argvars, rettv, TRUE);
}

/*
 * "uniq({list})" function
 */
    static void
f_uniq(typval_T *argvars, typval_T *rettv)
{
    do_sort_uniq(argvars, rettv, FALSE);
}

/*
 * "soundfold({word})" function
 */
    static void
f_soundfold(typval_T *argvars, typval_T *rettv)
{
    char_u	*s;

    rettv->v_type = VAR_STRING;
    s = get_tv_string(&argvars[0]);
#ifdef FEAT_SPELL
    rettv->vval.v_string = eval_soundfold(s);
#else
    rettv->vval.v_string = vim_strsave(s);
#endif
}

/*
 * "spellbadword()" function
 */
    static void
f_spellbadword(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*word = (char_u *)"";
    hlf_T	attr = HLF_COUNT;
    int		len = 0;

    if (rettv_list_alloc(rettv) == FAIL)
	return;

#ifdef FEAT_SPELL
    if (argvars[0].v_type == VAR_UNKNOWN)
    {
	/* Find the start and length of the badly spelled word. */
	len = spell_move_to(curwin, FORWARD, TRUE, TRUE, &attr);
	if (len != 0)
	    word = ml_get_cursor();
    }
    else if (curwin->w_p_spell && *curbuf->b_s.b_p_spl != NUL)
    {
	char_u	*str = get_tv_string_chk(&argvars[0]);
	int	capcol = -1;

	if (str != NULL)
	{
	    /* Check the argument for spelling. */
	    while (*str != NUL)
	    {
		len = spell_check(curwin, str, &attr, &capcol, FALSE);
		if (attr != HLF_COUNT)
		{
		    word = str;
		    break;
		}
		str += len;
	    }
	}
    }
#endif

    list_append_string(rettv->vval.v_list, word, len);
    list_append_string(rettv->vval.v_list, (char_u *)(
			attr == HLF_SPB ? "bad" :
			attr == HLF_SPR ? "rare" :
			attr == HLF_SPL ? "local" :
			attr == HLF_SPC ? "caps" :
			""), -1);
}

/*
 * "spellsuggest()" function
 */
    static void
f_spellsuggest(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_SPELL
    char_u	*str;
    int		typeerr = FALSE;
    int		maxcount;
    garray_T	ga;
    int		i;
    listitem_T	*li;
    int		need_capital = FALSE;
#endif

    if (rettv_list_alloc(rettv) == FAIL)
	return;

#ifdef FEAT_SPELL
    if (curwin->w_p_spell && *curwin->w_s->b_p_spl != NUL)
    {
	str = get_tv_string(&argvars[0]);
	if (argvars[1].v_type != VAR_UNKNOWN)
	{
	    maxcount = get_tv_number_chk(&argvars[1], &typeerr);
	    if (maxcount <= 0)
		return;
	    if (argvars[2].v_type != VAR_UNKNOWN)
	    {
		need_capital = get_tv_number_chk(&argvars[2], &typeerr);
		if (typeerr)
		    return;
	    }
	}
	else
	    maxcount = 25;

	spell_suggest_list(&ga, str, maxcount, need_capital, FALSE);

	for (i = 0; i < ga.ga_len; ++i)
	{
	    str = ((char_u **)ga.ga_data)[i];

	    li = listitem_alloc();
	    if (li == NULL)
		vim_free(str);
	    else
	    {
		li->li_tv.v_type = VAR_STRING;
		li->li_tv.v_lock = 0;
		li->li_tv.vval.v_string = str;
		list_append(rettv->vval.v_list, li);
	    }
	}
	ga_clear(&ga);
    }
#endif
}

    static void
f_split(typval_T *argvars, typval_T *rettv)
{
    char_u	*str;
    char_u	*end;
    char_u	*pat = NULL;
    regmatch_T	regmatch;
    char_u	patbuf[NUMBUFLEN];
    char_u	*save_cpo;
    int		match;
    colnr_T	col = 0;
    int		keepempty = FALSE;
    int		typeerr = FALSE;

    /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
    save_cpo = p_cpo;
    p_cpo = (char_u *)"";

    str = get_tv_string(&argvars[0]);
    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	pat = get_tv_string_buf_chk(&argvars[1], patbuf);
	if (pat == NULL)
	    typeerr = TRUE;
	if (argvars[2].v_type != VAR_UNKNOWN)
	    keepempty = get_tv_number_chk(&argvars[2], &typeerr);
    }
    if (pat == NULL || *pat == NUL)
	pat = (char_u *)"[\\x01- ]\\+";

    if (rettv_list_alloc(rettv) == FAIL)
	return;
    if (typeerr)
	return;

    regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
    if (regmatch.regprog != NULL)
    {
	regmatch.rm_ic = FALSE;
	while (*str != NUL || keepempty)
	{
	    if (*str == NUL)
		match = FALSE;	/* empty item at the end */
	    else
		match = vim_regexec_nl(&regmatch, str, col);
	    if (match)
		end = regmatch.startp[0];
	    else
		end = str + STRLEN(str);
	    if (keepempty || end > str || (rettv->vval.v_list->lv_len > 0
			   && *str != NUL && match && end < regmatch.endp[0]))
	    {
		if (list_append_string(rettv->vval.v_list, str,
						    (int)(end - str)) == FAIL)
		    break;
	    }
	    if (!match)
		break;
	    /* Advance to just after the match. */
	    if (regmatch.endp[0] > str)
		col = 0;
	    else
	    {
		/* Don't get stuck at the same match. */
#ifdef FEAT_MBYTE
		col = (*mb_ptr2len)(regmatch.endp[0]);
#else
		col = 1;
#endif
	    }
	    str = regmatch.endp[0];
	}

	vim_regfree(regmatch.regprog);
    }

    p_cpo = save_cpo;
}

#ifdef FEAT_FLOAT
/*
 * "sqrt()" function
 */
    static void
f_sqrt(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = sqrt(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "str2float()" function
 */
    static void
f_str2float(typval_T *argvars, typval_T *rettv)
{
    char_u *p = skipwhite(get_tv_string(&argvars[0]));

    if (*p == '+')
	p = skipwhite(p + 1);
    (void)string2float(p, &rettv->vval.v_float);
    rettv->v_type = VAR_FLOAT;
}
#endif

/*
 * "str2nr()" function
 */
    static void
f_str2nr(typval_T *argvars, typval_T *rettv)
{
    int		base = 10;
    char_u	*p;
    long	n;
    int		what;

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	base = get_tv_number(&argvars[1]);
	if (base != 2 && base != 8 && base != 10 && base != 16)
	{
	    EMSG(_(e_invarg));
	    return;
	}
    }

    p = skipwhite(get_tv_string(&argvars[0]));
    if (*p == '+')
	p = skipwhite(p + 1);
    switch (base)
    {
	case 2: what = STR2NR_BIN + STR2NR_FORCE; break;
	case 8: what = STR2NR_OCT + STR2NR_FORCE; break;
	case 16: what = STR2NR_HEX + STR2NR_FORCE; break;
	default: what = 0;
    }
    vim_str2nr(p, NULL, NULL, what, &n, NULL, 0);
    rettv->vval.v_number = n;
}

#ifdef HAVE_STRFTIME
/*
 * "strftime({format}[, {time}])" function
 */
    static void
f_strftime(typval_T *argvars, typval_T *rettv)
{
    char_u	result_buf[256];
    struct tm	*curtime;
    time_t	seconds;
    char_u	*p;

    rettv->v_type = VAR_STRING;

    p = get_tv_string(&argvars[0]);
    if (argvars[1].v_type == VAR_UNKNOWN)
	seconds = time(NULL);
    else
	seconds = (time_t)get_tv_number(&argvars[1]);
    curtime = localtime(&seconds);
    /* MSVC returns NULL for an invalid value of seconds. */
    if (curtime == NULL)
	rettv->vval.v_string = vim_strsave((char_u *)_("(Invalid)"));
    else
    {
# ifdef FEAT_MBYTE
	vimconv_T   conv;
	char_u	    *enc;

	conv.vc_type = CONV_NONE;
	enc = enc_locale();
	convert_setup(&conv, p_enc, enc);
	if (conv.vc_type != CONV_NONE)
	    p = string_convert(&conv, p, NULL);
# endif
	if (p != NULL)
	    (void)strftime((char *)result_buf, sizeof(result_buf),
							  (char *)p, curtime);
	else
	    result_buf[0] = NUL;

# ifdef FEAT_MBYTE
	if (conv.vc_type != CONV_NONE)
	    vim_free(p);
	convert_setup(&conv, enc, p_enc);
	if (conv.vc_type != CONV_NONE)
	    rettv->vval.v_string = string_convert(&conv, result_buf, NULL);
	else
# endif
	    rettv->vval.v_string = vim_strsave(result_buf);

# ifdef FEAT_MBYTE
	/* Release conversion descriptors */
	convert_setup(&conv, NULL, NULL);
	vim_free(enc);
# endif
    }
}
#endif

/*
 * "stridx()" function
 */
    static void
f_stridx(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];
    char_u	*needle;
    char_u	*haystack;
    char_u	*save_haystack;
    char_u	*pos;
    int		start_idx;

    needle = get_tv_string_chk(&argvars[1]);
    save_haystack = haystack = get_tv_string_buf_chk(&argvars[0], buf);
    rettv->vval.v_number = -1;
    if (needle == NULL || haystack == NULL)
	return;		/* type error; errmsg already given */

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	int	    error = FALSE;

	start_idx = get_tv_number_chk(&argvars[2], &error);
	if (error || start_idx >= (int)STRLEN(haystack))
	    return;
	if (start_idx >= 0)
	    haystack += start_idx;
    }

    pos	= (char_u *)strstr((char *)haystack, (char *)needle);
    if (pos != NULL)
	rettv->vval.v_number = (varnumber_T)(pos - save_haystack);
}

/*
 * "string()" function
 */
    static void
f_string(typval_T *argvars, typval_T *rettv)
{
    char_u	*tofree;
    char_u	numbuf[NUMBUFLEN];

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = tv2string(&argvars[0], &tofree, numbuf, 0);
    /* Make a copy if we have a value but it's not in allocated memory. */
    if (rettv->vval.v_string != NULL && tofree == NULL)
	rettv->vval.v_string = vim_strsave(rettv->vval.v_string);
}

/*
 * "strlen()" function
 */
    static void
f_strlen(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = (varnumber_T)(STRLEN(
					      get_tv_string(&argvars[0])));
}

/*
 * "strchars()" function
 */
    static void
f_strchars(typval_T *argvars, typval_T *rettv)
{
    char_u		*s = get_tv_string(&argvars[0]);
    int			skipcc = 0;
#ifdef FEAT_MBYTE
    varnumber_T		len = 0;
    int			(*func_mb_ptr2char_adv)(char_u **pp);
#endif

    if (argvars[1].v_type != VAR_UNKNOWN)
	skipcc = get_tv_number_chk(&argvars[1], NULL);
    if (skipcc < 0 || skipcc > 1)
	EMSG(_(e_invarg));
    else
    {
#ifdef FEAT_MBYTE
	func_mb_ptr2char_adv = skipcc ? mb_ptr2char_adv : mb_cptr2char_adv;
	while (*s != NUL)
	{
	    func_mb_ptr2char_adv(&s);
	    ++len;
	}
	rettv->vval.v_number = len;
#else
	rettv->vval.v_number = (varnumber_T)(STRLEN(s));
#endif
    }
}

/*
 * "strdisplaywidth()" function
 */
    static void
f_strdisplaywidth(typval_T *argvars, typval_T *rettv)
{
    char_u	*s = get_tv_string(&argvars[0]);
    int		col = 0;

    if (argvars[1].v_type != VAR_UNKNOWN)
	col = get_tv_number(&argvars[1]);

    rettv->vval.v_number = (varnumber_T)(linetabsize_col(col, s) - col);
}

/*
 * "strwidth()" function
 */
    static void
f_strwidth(typval_T *argvars, typval_T *rettv)
{
    char_u	*s = get_tv_string(&argvars[0]);

    rettv->vval.v_number = (varnumber_T)(
#ifdef FEAT_MBYTE
	    mb_string2cells(s, -1)
#else
	    STRLEN(s)
#endif
	    );
}

/*
 * "strpart()" function
 */
    static void
f_strpart(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;
    int		n;
    int		len;
    int		slen;
    int		error = FALSE;

    p = get_tv_string(&argvars[0]);
    slen = (int)STRLEN(p);

    n = get_tv_number_chk(&argvars[1], &error);
    if (error)
	len = 0;
    else if (argvars[2].v_type != VAR_UNKNOWN)
	len = get_tv_number(&argvars[2]);
    else
	len = slen - n;	    /* default len: all bytes that are available. */

    /*
     * Only return the overlap between the specified part and the actual
     * string.
     */
    if (n < 0)
    {
	len += n;
	n = 0;
    }
    else if (n > slen)
	n = slen;
    if (len < 0)
	len = 0;
    else if (n + len > slen)
	len = slen - n;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_strnsave(p + n, len);
}

/*
 * "strridx()" function
 */
    static void
f_strridx(typval_T *argvars, typval_T *rettv)
{
    char_u	buf[NUMBUFLEN];
    char_u	*needle;
    char_u	*haystack;
    char_u	*rest;
    char_u	*lastmatch = NULL;
    int		haystack_len, end_idx;

    needle = get_tv_string_chk(&argvars[1]);
    haystack = get_tv_string_buf_chk(&argvars[0], buf);

    rettv->vval.v_number = -1;
    if (needle == NULL || haystack == NULL)
	return;		/* type error; errmsg already given */

    haystack_len = (int)STRLEN(haystack);
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	/* Third argument: upper limit for index */
	end_idx = get_tv_number_chk(&argvars[2], NULL);
	if (end_idx < 0)
	    return;	/* can never find a match */
    }
    else
	end_idx = haystack_len;

    if (*needle == NUL)
    {
	/* Empty string matches past the end. */
	lastmatch = haystack + end_idx;
    }
    else
    {
	for (rest = haystack; *rest != '\0'; ++rest)
	{
	    rest = (char_u *)strstr((char *)rest, (char *)needle);
	    if (rest == NULL || rest > haystack + end_idx)
		break;
	    lastmatch = rest;
	}
    }

    if (lastmatch == NULL)
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = (varnumber_T)(lastmatch - haystack);
}

/*
 * "strtrans()" function
 */
    static void
f_strtrans(typval_T *argvars, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = transstr(get_tv_string(&argvars[0]));
}

/*
 * "submatch()" function
 */
    static void
f_submatch(typval_T *argvars, typval_T *rettv)
{
    int		error = FALSE;
    int		no;
    int		retList = 0;

    no = (int)get_tv_number_chk(&argvars[0], &error);
    if (error)
	return;
    error = FALSE;
    if (argvars[1].v_type != VAR_UNKNOWN)
	retList = get_tv_number_chk(&argvars[1], &error);
    if (error)
	return;

    if (retList == 0)
    {
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = reg_submatch(no);
    }
    else
    {
	rettv->v_type = VAR_LIST;
	rettv->vval.v_list = reg_submatch_list(no);
    }
}

/*
 * "substitute()" function
 */
    static void
f_substitute(typval_T *argvars, typval_T *rettv)
{
    char_u	patbuf[NUMBUFLEN];
    char_u	subbuf[NUMBUFLEN];
    char_u	flagsbuf[NUMBUFLEN];

    char_u	*str = get_tv_string_chk(&argvars[0]);
    char_u	*pat = get_tv_string_buf_chk(&argvars[1], patbuf);
    char_u	*sub = get_tv_string_buf_chk(&argvars[2], subbuf);
    char_u	*flg = get_tv_string_buf_chk(&argvars[3], flagsbuf);

    rettv->v_type = VAR_STRING;
    if (str == NULL || pat == NULL || sub == NULL || flg == NULL)
	rettv->vval.v_string = NULL;
    else
	rettv->vval.v_string = do_string_sub(str, pat, sub, flg);
}

/*
 * "synID(lnum, col, trans)" function
 */
    static void
f_synID(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		id = 0;
#ifdef FEAT_SYN_HL
    long	lnum;
    long	col;
    int		trans;
    int		transerr = FALSE;

    lnum = get_tv_lnum(argvars);		/* -1 on type error */
    col = get_tv_number(&argvars[1]) - 1;	/* -1 on type error */
    trans = get_tv_number_chk(&argvars[2], &transerr);

    if (!transerr && lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count
	    && col >= 0 && col < (long)STRLEN(ml_get(lnum)))
	id = syn_get_id(curwin, lnum, (colnr_T)col, trans, NULL, FALSE);
#endif

    rettv->vval.v_number = id;
}

/*
 * "synIDattr(id, what [, mode])" function
 */
    static void
f_synIDattr(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*p = NULL;
#ifdef FEAT_SYN_HL
    int		id;
    char_u	*what;
    char_u	*mode;
    char_u	modebuf[NUMBUFLEN];
    int		modec;

    id = get_tv_number(&argvars[0]);
    what = get_tv_string(&argvars[1]);
    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	mode = get_tv_string_buf(&argvars[2], modebuf);
	modec = TOLOWER_ASC(mode[0]);
	if (modec != 't' && modec != 'c' && modec != 'g')
	    modec = 0;	/* replace invalid with current */
    }
    else
    {
#ifdef FEAT_GUI
	if (gui.in_use)
	    modec = 'g';
	else
#endif
	    if (t_colors > 1)
	    modec = 'c';
	else
	    modec = 't';
    }


    switch (TOLOWER_ASC(what[0]))
    {
	case 'b':
		if (TOLOWER_ASC(what[1]) == 'g')	/* bg[#] */
		    p = highlight_color(id, what, modec);
		else					/* bold */
		    p = highlight_has_attr(id, HL_BOLD, modec);
		break;

	case 'f':					/* fg[#] or font */
		p = highlight_color(id, what, modec);
		break;

	case 'i':
		if (TOLOWER_ASC(what[1]) == 'n')	/* inverse */
		    p = highlight_has_attr(id, HL_INVERSE, modec);
		else					/* italic */
		    p = highlight_has_attr(id, HL_ITALIC, modec);
		break;

	case 'n':					/* name */
		p = get_highlight_name(NULL, id - 1);
		break;

	case 'r':					/* reverse */
		p = highlight_has_attr(id, HL_INVERSE, modec);
		break;

	case 's':
		if (TOLOWER_ASC(what[1]) == 'p')	/* sp[#] */
		    p = highlight_color(id, what, modec);
		else					/* standout */
		    p = highlight_has_attr(id, HL_STANDOUT, modec);
		break;

	case 'u':
		if (STRLEN(what) <= 5 || TOLOWER_ASC(what[5]) != 'c')
							/* underline */
		    p = highlight_has_attr(id, HL_UNDERLINE, modec);
		else
							/* undercurl */
		    p = highlight_has_attr(id, HL_UNDERCURL, modec);
		break;
    }

    if (p != NULL)
	p = vim_strsave(p);
#endif
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = p;
}

/*
 * "synIDtrans(id)" function
 */
    static void
f_synIDtrans(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		id;

#ifdef FEAT_SYN_HL
    id = get_tv_number(&argvars[0]);

    if (id > 0)
	id = syn_get_final_id(id);
    else
#endif
	id = 0;

    rettv->vval.v_number = id;
}

/*
 * "synconcealed(lnum, col)" function
 */
    static void
f_synconcealed(typval_T *argvars UNUSED, typval_T *rettv)
{
#if defined(FEAT_SYN_HL) && defined(FEAT_CONCEAL)
    long	lnum;
    long	col;
    int		syntax_flags = 0;
    int		cchar;
    int		matchid = 0;
    char_u	str[NUMBUFLEN];
#endif

    rettv->v_type = VAR_LIST;
    rettv->vval.v_list = NULL;

#if defined(FEAT_SYN_HL) && defined(FEAT_CONCEAL)
    lnum = get_tv_lnum(argvars);		/* -1 on type error */
    col = get_tv_number(&argvars[1]) - 1;	/* -1 on type error */

    vim_memset(str, NUL, sizeof(str));

    if (rettv_list_alloc(rettv) != FAIL)
    {
	if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count
	    && col >= 0 && col <= (long)STRLEN(ml_get(lnum))
	    && curwin->w_p_cole > 0)
	{
	    (void)syn_get_id(curwin, lnum, col, FALSE, NULL, FALSE);
	    syntax_flags = get_syntax_info(&matchid);

	    /* get the conceal character */
	    if ((syntax_flags & HL_CONCEAL) && curwin->w_p_cole < 3)
	    {
		cchar = syn_get_sub_char();
		if (cchar == NUL && curwin->w_p_cole == 1 && lcs_conceal != NUL)
		    cchar = lcs_conceal;
		if (cchar != NUL)
		{
# ifdef FEAT_MBYTE
		    if (has_mbyte)
			(*mb_char2bytes)(cchar, str);
		    else
# endif
			str[0] = cchar;
		}
	    }
	}

	list_append_number(rettv->vval.v_list,
					    (syntax_flags & HL_CONCEAL) != 0);
	/* -1 to auto-determine strlen */
	list_append_string(rettv->vval.v_list, str, -1);
	list_append_number(rettv->vval.v_list, matchid);
    }
#endif
}

/*
 * "synstack(lnum, col)" function
 */
    static void
f_synstack(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_SYN_HL
    long	lnum;
    long	col;
    int		i;
    int		id;
#endif

    rettv->v_type = VAR_LIST;
    rettv->vval.v_list = NULL;

#ifdef FEAT_SYN_HL
    lnum = get_tv_lnum(argvars);		/* -1 on type error */
    col = get_tv_number(&argvars[1]) - 1;	/* -1 on type error */

    if (lnum >= 1 && lnum <= curbuf->b_ml.ml_line_count
	    && col >= 0 && col <= (long)STRLEN(ml_get(lnum))
	    && rettv_list_alloc(rettv) != FAIL)
    {
	(void)syn_get_id(curwin, lnum, (colnr_T)col, FALSE, NULL, TRUE);
	for (i = 0; ; ++i)
	{
	    id = syn_get_stack_item(i);
	    if (id < 0)
		break;
	    if (list_append_number(rettv->vval.v_list, id) == FAIL)
		break;
	}
    }
#endif
}

    static void
get_cmd_output_as_rettv(
    typval_T	*argvars,
    typval_T	*rettv,
    int		retlist)
{
    char_u	*res = NULL;
    char_u	*p;
    char_u	*infile = NULL;
    char_u	buf[NUMBUFLEN];
    int		err = FALSE;
    FILE	*fd;
    list_T	*list = NULL;
    int		flags = SHELL_SILENT;

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
    if (check_restricted() || check_secure())
	goto errret;

    if (argvars[1].v_type != VAR_UNKNOWN)
    {
	/*
	 * Write the string to a temp file, to be used for input of the shell
	 * command.
	 */
	if ((infile = vim_tempname('i', TRUE)) == NULL)
	{
	    EMSG(_(e_notmp));
	    goto errret;
	}

	fd = mch_fopen((char *)infile, WRITEBIN);
	if (fd == NULL)
	{
	    EMSG2(_(e_notopen), infile);
	    goto errret;
	}
	if (argvars[1].v_type == VAR_LIST)
	{
	    if (write_list(fd, argvars[1].vval.v_list, TRUE) == FAIL)
		err = TRUE;
	}
	else
	{
	    size_t len;

	    p = get_tv_string_buf_chk(&argvars[1], buf);
	    if (p == NULL)
	    {
		fclose(fd);
		goto errret;		/* type error; errmsg already given */
	    }
	    len = STRLEN(p);
	    if (len > 0 && fwrite(p, len, 1, fd) != 1)
		err = TRUE;
	}
	if (fclose(fd) != 0)
	    err = TRUE;
	if (err)
	{
	    EMSG(_("E677: Error writing temp file"));
	    goto errret;
	}
    }

    /* Omit SHELL_COOKED when invoked with ":silent".  Avoids that the shell
     * echoes typeahead, that messes up the display. */
    if (!msg_silent)
	flags += SHELL_COOKED;

    if (retlist)
    {
	int		len;
	listitem_T	*li;
	char_u		*s = NULL;
	char_u		*start;
	char_u		*end;
	int		i;

	res = get_cmd_output(get_tv_string(&argvars[0]), infile, flags, &len);
	if (res == NULL)
	    goto errret;

	list = list_alloc();
	if (list == NULL)
	    goto errret;

	for (i = 0; i < len; ++i)
	{
	    start = res + i;
	    while (i < len && res[i] != NL)
		++i;
	    end = res + i;

	    s = alloc((unsigned)(end - start + 1));
	    if (s == NULL)
		goto errret;

	    for (p = s; start < end; ++p, ++start)
		*p = *start == NUL ? NL : *start;
	    *p = NUL;

	    li = listitem_alloc();
	    if (li == NULL)
	    {
		vim_free(s);
		goto errret;
	    }
	    li->li_tv.v_type = VAR_STRING;
	    li->li_tv.v_lock = 0;
	    li->li_tv.vval.v_string = s;
	    list_append(list, li);
	}

	++list->lv_refcount;
	rettv->v_type = VAR_LIST;
	rettv->vval.v_list = list;
	list = NULL;
    }
    else
    {
	res = get_cmd_output(get_tv_string(&argvars[0]), infile, flags, NULL);
#ifdef USE_CR
	/* translate <CR> into <NL> */
	if (res != NULL)
	{
	    char_u	*s;

	    for (s = res; *s; ++s)
	    {
		if (*s == CAR)
		    *s = NL;
	    }
	}
#else
# ifdef USE_CRNL
	/* translate <CR><NL> into <NL> */
	if (res != NULL)
	{
	    char_u	*s, *d;

	    d = res;
	    for (s = res; *s; ++s)
	    {
		if (s[0] == CAR && s[1] == NL)
		    ++s;
		*d++ = *s;
	    }
	    *d = NUL;
	}
# endif
#endif
	rettv->vval.v_string = res;
	res = NULL;
    }

errret:
    if (infile != NULL)
    {
	mch_remove(infile);
	vim_free(infile);
    }
    if (res != NULL)
	vim_free(res);
    if (list != NULL)
	list_free(list, TRUE);
}

/*
 * "system()" function
 */
    static void
f_system(typval_T *argvars, typval_T *rettv)
{
    get_cmd_output_as_rettv(argvars, rettv, FALSE);
}

/*
 * "systemlist()" function
 */
    static void
f_systemlist(typval_T *argvars, typval_T *rettv)
{
    get_cmd_output_as_rettv(argvars, rettv, TRUE);
}

/*
 * "tabpagebuflist()" function
 */
    static void
f_tabpagebuflist(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_WINDOWS
    tabpage_T	*tp;
    win_T	*wp = NULL;

    if (argvars[0].v_type == VAR_UNKNOWN)
	wp = firstwin;
    else
    {
	tp = find_tabpage((int)get_tv_number(&argvars[0]));
	if (tp != NULL)
	    wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
    }
    if (wp != NULL && rettv_list_alloc(rettv) != FAIL)
    {
	for (; wp != NULL; wp = wp->w_next)
	    if (list_append_number(rettv->vval.v_list,
						wp->w_buffer->b_fnum) == FAIL)
		break;
    }
#endif
}


/*
 * "tabpagenr()" function
 */
    static void
f_tabpagenr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		nr = 1;
#ifdef FEAT_WINDOWS
    char_u	*arg;

    if (argvars[0].v_type != VAR_UNKNOWN)
    {
	arg = get_tv_string_chk(&argvars[0]);
	nr = 0;
	if (arg != NULL)
	{
	    if (STRCMP(arg, "$") == 0)
		nr = tabpage_index(NULL) - 1;
	    else
		EMSG2(_(e_invexpr2), arg);
	}
    }
    else
	nr = tabpage_index(curtab);
#endif
    rettv->vval.v_number = nr;
}


#ifdef FEAT_WINDOWS
static int get_winnr(tabpage_T *tp, typval_T *argvar);

/*
 * Common code for tabpagewinnr() and winnr().
 */
    static int
get_winnr(tabpage_T *tp, typval_T *argvar)
{
    win_T	*twin;
    int		nr = 1;
    win_T	*wp;
    char_u	*arg;

    twin = (tp == curtab) ? curwin : tp->tp_curwin;
    if (argvar->v_type != VAR_UNKNOWN)
    {
	arg = get_tv_string_chk(argvar);
	if (arg == NULL)
	    nr = 0;		/* type error; errmsg already given */
	else if (STRCMP(arg, "$") == 0)
	    twin = (tp == curtab) ? lastwin : tp->tp_lastwin;
	else if (STRCMP(arg, "#") == 0)
	{
	    twin = (tp == curtab) ? prevwin : tp->tp_prevwin;
	    if (twin == NULL)
		nr = 0;
	}
	else
	{
	    EMSG2(_(e_invexpr2), arg);
	    nr = 0;
	}
    }

    if (nr > 0)
	for (wp = (tp == curtab) ? firstwin : tp->tp_firstwin;
					      wp != twin; wp = wp->w_next)
	{
	    if (wp == NULL)
	    {
		/* didn't find it in this tabpage */
		nr = 0;
		break;
	    }
	    ++nr;
	}
    return nr;
}
#endif

/*
 * "tabpagewinnr()" function
 */
    static void
f_tabpagewinnr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		nr = 1;
#ifdef FEAT_WINDOWS
    tabpage_T	*tp;

    tp = find_tabpage((int)get_tv_number(&argvars[0]));
    if (tp == NULL)
	nr = 0;
    else
	nr = get_winnr(tp, &argvars[1]);
#endif
    rettv->vval.v_number = nr;
}


/*
 * "tagfiles()" function
 */
    static void
f_tagfiles(typval_T *argvars UNUSED, typval_T *rettv)
{
    char_u	*fname;
    tagname_T	tn;
    int		first;

    if (rettv_list_alloc(rettv) == FAIL)
	return;
    fname = alloc(MAXPATHL);
    if (fname == NULL)
	return;

    for (first = TRUE; ; first = FALSE)
	if (get_tagfname(&tn, first, fname) == FAIL
		|| list_append_string(rettv->vval.v_list, fname, -1) == FAIL)
	    break;
    tagname_free(&tn);
    vim_free(fname);
}

/*
 * "taglist()" function
 */
    static void
f_taglist(typval_T *argvars, typval_T *rettv)
{
    char_u  *tag_pattern;

    tag_pattern = get_tv_string(&argvars[0]);

    rettv->vval.v_number = FALSE;
    if (*tag_pattern == NUL)
	return;

    if (rettv_list_alloc(rettv) == OK)
	(void)get_tags(rettv->vval.v_list, tag_pattern);
}

/*
 * "tempname()" function
 */
    static void
f_tempname(typval_T *argvars UNUSED, typval_T *rettv)
{
    static int	x = 'A';

    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = vim_tempname(x, FALSE);

    /* Advance 'x' to use A-Z and 0-9, so that there are at least 34 different
     * names.  Skip 'I' and 'O', they are used for shell redirection. */
    do
    {
	if (x == 'Z')
	    x = '0';
	else if (x == '9')
	    x = 'A';
	else
	{
#ifdef EBCDIC
	    if (x == 'I')
		x = 'J';
	    else if (x == 'R')
		x = 'S';
	    else
#endif
		++x;
	}
    } while (x == 'I' || x == 'O');
}

/*
 * "test(list)" function: Just checking the walls...
 */
    static void
f_test(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
    /* Used for unit testing.  Change the code below to your liking. */
#if 0
    listitem_T	*li;
    list_T	*l;
    char_u	*bad, *good;

    if (argvars[0].v_type != VAR_LIST)
	return;
    l = argvars[0].vval.v_list;
    if (l == NULL)
	return;
    li = l->lv_first;
    if (li == NULL)
	return;
    bad = get_tv_string(&li->li_tv);
    li = li->li_next;
    if (li == NULL)
	return;
    good = get_tv_string(&li->li_tv);
    rettv->vval.v_number = test_edit_score(bad, good);
#endif
}

#ifdef FEAT_FLOAT
/*
 * "tan()" function
 */
    static void
f_tan(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = tan(f);
    else
	rettv->vval.v_float = 0.0;
}

/*
 * "tanh()" function
 */
    static void
f_tanh(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	rettv->vval.v_float = tanh(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "tolower(string)" function
 */
    static void
f_tolower(typval_T *argvars, typval_T *rettv)
{
    char_u	*p;

    p = vim_strsave(get_tv_string(&argvars[0]));
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = p;

    if (p != NULL)
	while (*p != NUL)
	{
#ifdef FEAT_MBYTE
	    int		l;

	    if (enc_utf8)
	    {
		int c, lc;

		c = utf_ptr2char(p);
		lc = utf_tolower(c);
		l = utf_ptr2len(p);
		/* TODO: reallocate string when byte count changes. */
		if (utf_char2len(lc) == l)
		    utf_char2bytes(lc, p);
		p += l;
	    }
	    else if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1)
		p += l;		/* skip multi-byte character */
	    else
#endif
	    {
		*p = TOLOWER_LOC(*p); /* note that tolower() can be a macro */
		++p;
	    }
	}
}

/*
 * "toupper(string)" function
 */
    static void
f_toupper(typval_T *argvars, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = strup_save(get_tv_string(&argvars[0]));
}

/*
 * "tr(string, fromstr, tostr)" function
 */
    static void
f_tr(typval_T *argvars, typval_T *rettv)
{
    char_u	*in_str;
    char_u	*fromstr;
    char_u	*tostr;
    char_u	*p;
#ifdef FEAT_MBYTE
    int		inlen;
    int		fromlen;
    int		tolen;
    int		idx;
    char_u	*cpstr;
    int		cplen;
    int		first = TRUE;
#endif
    char_u	buf[NUMBUFLEN];
    char_u	buf2[NUMBUFLEN];
    garray_T	ga;

    in_str = get_tv_string(&argvars[0]);
    fromstr = get_tv_string_buf_chk(&argvars[1], buf);
    tostr = get_tv_string_buf_chk(&argvars[2], buf2);

    /* Default return value: empty string. */
    rettv->v_type = VAR_STRING;
    rettv->vval.v_string = NULL;
    if (fromstr == NULL || tostr == NULL)
	    return;		/* type error; errmsg already given */
    ga_init2(&ga, (int)sizeof(char), 80);

#ifdef FEAT_MBYTE
    if (!has_mbyte)
#endif
	/* not multi-byte: fromstr and tostr must be the same length */
	if (STRLEN(fromstr) != STRLEN(tostr))
	{
#ifdef FEAT_MBYTE
error:
#endif
	    EMSG2(_(e_invarg2), fromstr);
	    ga_clear(&ga);
	    return;
	}

    /* fromstr and tostr have to contain the same number of chars */
    while (*in_str != NUL)
    {
#ifdef FEAT_MBYTE
	if (has_mbyte)
	{
	    inlen = (*mb_ptr2len)(in_str);
	    cpstr = in_str;
	    cplen = inlen;
	    idx = 0;
	    for (p = fromstr; *p != NUL; p += fromlen)
	    {
		fromlen = (*mb_ptr2len)(p);
		if (fromlen == inlen && STRNCMP(in_str, p, inlen) == 0)
		{
		    for (p = tostr; *p != NUL; p += tolen)
		    {
			tolen = (*mb_ptr2len)(p);
			if (idx-- == 0)
			{
			    cplen = tolen;
			    cpstr = p;
			    break;
			}
		    }
		    if (*p == NUL)	/* tostr is shorter than fromstr */
			goto error;
		    break;
		}
		++idx;
	    }

	    if (first && cpstr == in_str)
	    {
		/* Check that fromstr and tostr have the same number of
		 * (multi-byte) characters.  Done only once when a character
		 * of in_str doesn't appear in fromstr. */
		first = FALSE;
		for (p = tostr; *p != NUL; p += tolen)
		{
		    tolen = (*mb_ptr2len)(p);
		    --idx;
		}
		if (idx != 0)
		    goto error;
	    }

	    (void)ga_grow(&ga, cplen);
	    mch_memmove((char *)ga.ga_data + ga.ga_len, cpstr, (size_t)cplen);
	    ga.ga_len += cplen;

	    in_str += inlen;
	}
	else
#endif
	{
	    /* When not using multi-byte chars we can do it faster. */
	    p = vim_strchr(fromstr, *in_str);
	    if (p != NULL)
		ga_append(&ga, tostr[p - fromstr]);
	    else
		ga_append(&ga, *in_str);
	    ++in_str;
	}
    }

    /* add a terminating NUL */
    (void)ga_grow(&ga, 1);
    ga_append(&ga, NUL);

    rettv->vval.v_string = ga.ga_data;
}

#ifdef FEAT_FLOAT
/*
 * "trunc({float})" function
 */
    static void
f_trunc(typval_T *argvars, typval_T *rettv)
{
    float_T	f;

    rettv->v_type = VAR_FLOAT;
    if (get_float_arg(argvars, &f) == OK)
	/* trunc() is not in C90, use floor() or ceil() instead. */
	rettv->vval.v_float = f > 0 ? floor(f) : ceil(f);
    else
	rettv->vval.v_float = 0.0;
}
#endif

/*
 * "type(expr)" function
 */
    static void
f_type(typval_T *argvars, typval_T *rettv)
{
    int n;

    switch (argvars[0].v_type)
    {
	case VAR_NUMBER: n = 0; break;
	case VAR_STRING: n = 1; break;
	case VAR_FUNC:   n = 2; break;
	case VAR_LIST:   n = 3; break;
	case VAR_DICT:   n = 4; break;
#ifdef FEAT_FLOAT
	case VAR_FLOAT:  n = 5; break;
#endif
	case VAR_SPECIAL:
	     if (argvars[0].vval.v_number == VVAL_FALSE
		     || argvars[0].vval.v_number == VVAL_TRUE)
		 n = 6;
	     else
		 n = 7;
	     break;
	case VAR_UNKNOWN:
	     EMSG2(_(e_intern2), "f_type(UNKNOWN)");
	     n = -1;
	     break;
    }
    rettv->vval.v_number = n;
}

/*
 * "undofile(name)" function
 */
    static void
f_undofile(typval_T *argvars UNUSED, typval_T *rettv)
{
    rettv->v_type = VAR_STRING;
#ifdef FEAT_PERSISTENT_UNDO
    {
	char_u *fname = get_tv_string(&argvars[0]);

	if (*fname == NUL)
	{
	    /* If there is no file name there will be no undo file. */
	    rettv->vval.v_string = NULL;
	}
	else
	{
	    char_u *ffname = FullName_save(fname, FALSE);

	    if (ffname != NULL)
		rettv->vval.v_string = u_get_undo_file_name(ffname, FALSE);
	    vim_free(ffname);
	}
    }
#else
    rettv->vval.v_string = NULL;
#endif
}

/*
 * "undotree()" function
 */
    static void
f_undotree(typval_T *argvars UNUSED, typval_T *rettv)
{
    if (rettv_dict_alloc(rettv) == OK)
    {
	dict_T *dict = rettv->vval.v_dict;
	list_T *list;

	dict_add_nr_str(dict, "synced", (long)curbuf->b_u_synced, NULL);
	dict_add_nr_str(dict, "seq_last", curbuf->b_u_seq_last, NULL);
	dict_add_nr_str(dict, "save_last",
					(long)curbuf->b_u_save_nr_last, NULL);
	dict_add_nr_str(dict, "seq_cur", curbuf->b_u_seq_cur, NULL);
	dict_add_nr_str(dict, "time_cur", (long)curbuf->b_u_time_cur, NULL);
	dict_add_nr_str(dict, "save_cur", (long)curbuf->b_u_save_nr_cur, NULL);

	list = list_alloc();
	if (list != NULL)
	{
	    u_eval_tree(curbuf->b_u_oldhead, list);
	    dict_add_list(dict, "entries", list);
	}
    }
}

/*
 * "values(dict)" function
 */
    static void
f_values(typval_T *argvars, typval_T *rettv)
{
    dict_list(argvars, rettv, 1);
}

/*
 * "virtcol(string)" function
 */
    static void
f_virtcol(typval_T *argvars, typval_T *rettv)
{
    colnr_T	vcol = 0;
    pos_T	*fp;
    int		fnum = curbuf->b_fnum;

    fp = var2fpos(&argvars[0], FALSE, &fnum);
    if (fp != NULL && fp->lnum <= curbuf->b_ml.ml_line_count
						    && fnum == curbuf->b_fnum)
    {
	getvvcol(curwin, fp, NULL, NULL, &vcol);
	++vcol;
    }

    rettv->vval.v_number = vcol;
}

/*
 * "visualmode()" function
 */
    static void
f_visualmode(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
    char_u	str[2];

    rettv->v_type = VAR_STRING;
    str[0] = curbuf->b_visual_mode_eval;
    str[1] = NUL;
    rettv->vval.v_string = vim_strsave(str);

    /* A non-zero number or non-empty string argument: reset mode. */
    if (non_zero_arg(&argvars[0]))
	curbuf->b_visual_mode_eval = NUL;
}

/*
 * "wildmenumode()" function
 */
    static void
f_wildmenumode(typval_T *argvars UNUSED, typval_T *rettv UNUSED)
{
#ifdef FEAT_WILDMENU
    if (wild_menu_showing)
	rettv->vval.v_number = 1;
#endif
}

/*
 * "winbufnr(nr)" function
 */
    static void
f_winbufnr(typval_T *argvars, typval_T *rettv)
{
    win_T	*wp;

    wp = find_win_by_nr(&argvars[0], NULL);
    if (wp == NULL)
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = wp->w_buffer->b_fnum;
}

/*
 * "wincol()" function
 */
    static void
f_wincol(typval_T *argvars UNUSED, typval_T *rettv)
{
    validate_cursor();
    rettv->vval.v_number = curwin->w_wcol + 1;
}

/*
 * "winheight(nr)" function
 */
    static void
f_winheight(typval_T *argvars, typval_T *rettv)
{
    win_T	*wp;

    wp = find_win_by_nr(&argvars[0], NULL);
    if (wp == NULL)
	rettv->vval.v_number = -1;
    else
	rettv->vval.v_number = wp->w_height;
}

/*
 * "winline()" function
 */
    static void
f_winline(typval_T *argvars UNUSED, typval_T *rettv)
{
    validate_cursor();
    rettv->vval.v_number = curwin->w_wrow + 1;
}

/*
 * "winnr()" function
 */
    static void
f_winnr(typval_T *argvars UNUSED, typval_T *rettv)
{
    int		nr = 1;

#ifdef FEAT_WINDOWS
    nr = get_winnr(curtab, &argvars[0]);
#endif
    rettv->vval.v_number = nr;
}

/*
 * "winrestcmd()" function
 */
    static void
f_winrestcmd(typval_T *argvars UNUSED, typval_T *rettv)
{
#ifdef FEAT_WINDOWS
    win_T	*wp;
    int		winnr = 1;
    garray_T	ga;
    char_u	buf[50];

    ga_init2(&ga, (int)sizeof(char), 70);
    for (wp = firstwin; wp != NULL; wp = wp->w_next)
    {
	sprintf((char *)buf, "%dresize %d|", winnr, wp->w_height);
	ga_concat(&ga, buf);
# ifdef FEAT_VERTSPLIT
	sprintf((char *)buf, "vert %dresize %d|", winnr, wp->w_width);
	ga_concat(&ga, buf);
# endif
	++winnr;
    }
    ga_append(&ga, NUL);

    rettv->vval.v_string = ga.ga_data;
#else
    rettv->vval.v_string = NULL;
#endif
    rettv->v_type = VAR_STRING;
}

/*
 * "winrestview()" function
 */
    static void
f_winrestview(typval_T *argvars, typval_T *rettv UNUSED)
{
    dict_T	*dict;

    if (argvars[0].v_type != VAR_DICT
	    || (dict = argvars[0].vval.v_dict) == NULL)
	EMSG(_(e_invarg));
    else
    {
	if (dict_find(dict, (char_u *)"lnum", -1) != NULL)
	    curwin->w_cursor.lnum = get_dict_number(dict, (char_u *)"lnum");
	if (dict_find(dict, (char_u *)"col", -1) != NULL)
	    curwin->w_cursor.col = get_dict_number(dict, (char_u *)"col");
#ifdef FEAT_VIRTUALEDIT
	if (dict_find(dict, (char_u *)"coladd", -1) != NULL)
	    curwin->w_cursor.coladd = get_dict_number(dict, (char_u *)"coladd");
#endif
	if (dict_find(dict, (char_u *)"curswant", -1) != NULL)
	{
	    curwin->w_curswant = get_dict_number(dict, (char_u *)"curswant");
	    curwin->w_set_curswant = FALSE;
	}

	if (dict_find(dict, (char_u *)"topline", -1) != NULL)
	    set_topline(curwin, get_dict_number(dict, (char_u *)"topline"));
#ifdef FEAT_DIFF
	if (dict_find(dict, (char_u *)"topfill", -1) != NULL)
	    curwin->w_topfill = get_dict_number(dict, (char_u *)"topfill");
#endif
	if (dict_find(dict, (char_u *)"leftcol", -1) != NULL)
	    curwin->w_leftcol = get_dict_number(dict, (char_u *)"leftcol");
	if (dict_find(dict, (char_u *)"skipcol", -1) != NULL)
	    curwin->w_skipcol = get_dict_number(dict, (char_u *)"skipcol");

	check_cursor();
	win_new_height(curwin, curwin->w_height);
# ifdef FEAT_VERTSPLIT
	win_new_width(curwin, W_WIDTH(curwin));
# endif
	changed_window_setting();

	if (curwin->w_topline <= 0)
	    curwin->w_topline = 1;
	if (curwin->w_topline > curbuf->b_ml.ml_line_count)
	    curwin->w_topline = curbuf->b_ml.ml_line_count;
#ifdef FEAT_DIFF
	check_topfill(curwin, TRUE);
#endif
    }
}

/*
 * "winsaveview()" function
 */
    static void
f_winsaveview(typval_T *argvars UNUSED, typval_T *rettv)
{
    dict_T	*dict;

    if (rettv_dict_alloc(rettv) == FAIL)
	return;
    dict = rettv->vval.v_dict;

    dict_add_nr_str(dict, "lnum", (long)curwin->w_cursor.lnum, NULL);
    dict_add_nr_str(dict, "col", (long)curwin->w_cursor.col, NULL);
#ifdef FEAT_VIRTUALEDIT
    dict_add_nr_str(dict, "coladd", (long)curwin->w_cursor.coladd, NULL);
#endif
    update_curswant();
    dict_add_nr_str(dict, "curswant", (long)curwin->w_curswant, NULL);

    dict_add_nr_str(dict, "topline", (long)curwin->w_topline, NULL);
#ifdef FEAT_DIFF
    dict_add_nr_str(dict, "topfill", (long)curwin->w_topfill, NULL);
#endif
    dict_add_nr_str(dict, "leftcol", (long)curwin->w_leftcol, NULL);
    dict_add_nr_str(dict, "skipcol", (long)curwin->w_skipcol, NULL);
}

/*
 * "winwidth(nr)" function
 */
    static void
f_winwidth(typval_T *argvars, typval_T *rettv)
{
    win_T	*wp;

    wp = find_win_by_nr(&argvars[0], NULL);
    if (wp == NULL)
	rettv->vval.v_number = -1;
    else
#ifdef FEAT_VERTSPLIT
	rettv->vval.v_number = wp->w_width;
#else
	rettv->vval.v_number = Columns;
#endif
}

/*
 * "wordcount()" function
 */
    static void
f_wordcount(typval_T *argvars UNUSED, typval_T *rettv)
{
    if (rettv_dict_alloc(rettv) == FAIL)
	return;
    cursor_pos_info(rettv->vval.v_dict);
}

/*
 * Write list of strings to file
 */
    static int
write_list(FILE *fd, list_T *list, int binary)
{
    listitem_T	*li;
    int		c;
    int		ret = OK;
    char_u	*s;

    for (li = list->lv_first; li != NULL; li = li->li_next)
    {
	for (s = get_tv_string(&li->li_tv); *s != NUL; ++s)
	{
	    if (*s == '\n')
		c = putc(NUL, fd);
	    else
		c = putc(*s, fd);
	    if (c == EOF)
	    {
		ret = FAIL;
		break;
	    }
	}
	if (!binary || li->li_next != NULL)
	    if (putc('\n', fd) == EOF)
	    {
		ret = FAIL;
		break;
	    }
	if (ret == FAIL)
	{
	    EMSG(_(e_write));
	    break;
	}
    }
    return ret;
}

/*
 * "writefile()" function
 */
    static void
f_writefile(typval_T *argvars, typval_T *rettv)
{
    int		binary = FALSE;
    int		append = FALSE;
    char_u	*fname;
    FILE	*fd;
    int		ret = 0;

    if (check_restricted() || check_secure())
	return;

    if (argvars[0].v_type != VAR_LIST)
    {
	EMSG2(_(e_listarg), "writefile()");
	return;
    }
    if (argvars[0].vval.v_list == NULL)
	return;

    if (argvars[2].v_type != VAR_UNKNOWN)
    {
	if (vim_strchr(get_tv_string(&argvars[2]), 'b') != NULL)
	    binary = TRUE;
	if (vim_strchr(get_tv_string(&argvars[2]), 'a') != NULL)
	    append = TRUE;
    }

    /* Always open the file in binary mode, library functions have a mind of
     * their own about CR-LF conversion. */
    fname = get_tv_string(&argvars[1]);
    if (*fname == NUL || (fd = mch_fopen((char *)fname,
				      append ? APPENDBIN : WRITEBIN)) == NULL)
    {
	EMSG2(_(e_notcreate), *fname == NUL ? (char_u *)_("<empty>") : fname);
	ret = -1;
    }
    else
    {
	if (write_list(fd, argvars[0].vval.v_list, binary) == FAIL)
	    ret = -1;
	fclose(fd);
    }

    rettv->vval.v_number = ret;
}

/*
 * "xor(expr, expr)" function
 */
    static void
f_xor(typval_T *argvars, typval_T *rettv)
{
    rettv->vval.v_number = get_tv_number_chk(&argvars[0], NULL)
					^ get_tv_number_chk(&argvars[1], NULL);
}


/*
 * Translate a String variable into a position.
 * Returns NULL when there is an error.
 */
    static pos_T *
var2fpos(
    typval_T	*varp,
    int		dollar_lnum,	/* TRUE when $ is last line */
    int		*fnum)		/* set to fnum for '0, 'A, etc. */
{
    char_u		*name;
    static pos_T	pos;
    pos_T		*pp;

    /* Argument can be [lnum, col, coladd]. */
    if (varp->v_type == VAR_LIST)
    {
	list_T		*l;
	int		len;
	int		error = FALSE;
	listitem_T	*li;

	l = varp->vval.v_list;
	if (l == NULL)
	    return NULL;

	/* Get the line number */
	pos.lnum = list_find_nr(l, 0L, &error);
	if (error || pos.lnum <= 0 || pos.lnum > curbuf->b_ml.ml_line_count)
	    return NULL;	/* invalid line number */

	/* Get the column number */
	pos.col = list_find_nr(l, 1L, &error);
	if (error)
	    return NULL;
	len = (long)STRLEN(ml_get(pos.lnum));

	/* We accept "$" for the column number: last column. */
	li = list_find(l, 1L);
	if (li != NULL && li->li_tv.v_type == VAR_STRING
		&& li->li_tv.vval.v_string != NULL
		&& STRCMP(li->li_tv.vval.v_string, "$") == 0)
	    pos.col = len + 1;

	/* Accept a position up to the NUL after the line. */
	if (pos.col == 0 || (int)pos.col > len + 1)
	    return NULL;	/* invalid column number */
	--pos.col;

#ifdef FEAT_VIRTUALEDIT
	/* Get the virtual offset.  Defaults to zero. */
	pos.coladd = list_find_nr(l, 2L, &error);
	if (error)
	    pos.coladd = 0;
#endif

	return &pos;
    }

    name = get_tv_string_chk(varp);
    if (name == NULL)
	return NULL;
    if (name[0] == '.')				/* cursor */
	return &curwin->w_cursor;
    if (name[0] == 'v' && name[1] == NUL)	/* Visual start */
    {
	if (VIsual_active)
	    return &VIsual;
	return &curwin->w_cursor;
    }
    if (name[0] == '\'')			/* mark */
    {
	pp = getmark_buf_fnum(curbuf, name[1], FALSE, fnum);
	if (pp == NULL || pp == (pos_T *)-1 || pp->lnum <= 0)
	    return NULL;
	return pp;
    }

#ifdef FEAT_VIRTUALEDIT
    pos.coladd = 0;
#endif

    if (name[0] == 'w' && dollar_lnum)
    {
	pos.col = 0;
	if (name[1] == '0')		/* "w0": first visible line */
	{
	    update_topline();
	    pos.lnum = curwin->w_topline;
	    return &pos;
	}
	else if (name[1] == '$')	/* "w$": last visible line */
	{
	    validate_botline();
	    pos.lnum = curwin->w_botline - 1;
	    return &pos;
	}
    }
    else if (name[0] == '$')		/* last column or line */
    {
	if (dollar_lnum)
	{
	    pos.lnum = curbuf->b_ml.ml_line_count;
	    pos.col = 0;
	}
	else
	{
	    pos.lnum = curwin->w_cursor.lnum;
	    pos.col = (colnr_T)STRLEN(ml_get_curline());
	}
	return &pos;
    }
    return NULL;
}

/*
 * Convert list in "arg" into a position and optional file number.
 * When "fnump" is NULL there is no file number, only 3 items.
 * Note that the column is passed on as-is, the caller may want to decrement
 * it to use 1 for the first column.
 * Return FAIL when conversion is not possible, doesn't check the position for
 * validity.
 */
    static int
list2fpos(
    typval_T	*arg,
    pos_T	*posp,
    int		*fnump,
    colnr_T	*curswantp)
{
    list_T	*l = arg->vval.v_list;
    long	i = 0;
    long	n;

    /* List must be: [fnum, lnum, col, coladd, curswant], where "fnum" is only
     * there when "fnump" isn't NULL; "coladd" and "curswant" are optional. */
    if (arg->v_type != VAR_LIST
	    || l == NULL
	    || l->lv_len < (fnump == NULL ? 2 : 3)
	    || l->lv_len > (fnump == NULL ? 4 : 5))
	return FAIL;

    if (fnump != NULL)
    {
	n = list_find_nr(l, i++, NULL);	/* fnum */
	if (n < 0)
	    return FAIL;
	if (n == 0)
	    n = curbuf->b_fnum;		/* current buffer */
	*fnump = n;
    }

    n = list_find_nr(l, i++, NULL);	/* lnum */
    if (n < 0)
	return FAIL;
    posp->lnum = n;

    n = list_find_nr(l, i++, NULL);	/* col */
    if (n < 0)
	return FAIL;
    posp->col = n;

#ifdef FEAT_VIRTUALEDIT
    n = list_find_nr(l, i, NULL);	/* off */
    if (n < 0)
	posp->coladd = 0;
    else
	posp->coladd = n;
#endif

    if (curswantp != NULL)
	*curswantp = list_find_nr(l, i + 1, NULL);  /* curswant */

    return OK;
}

/*
 * Get the length of an environment variable name.
 * Advance "arg" to the first character after the name.
 * Return 0 for error.
 */
    static int
get_env_len(char_u **arg)
{
    char_u	*p;
    int		len;

    for (p = *arg; vim_isIDc(*p); ++p)
	;
    if (p == *arg)	    /* no name found */
	return 0;

    len = (int)(p - *arg);
    *arg = p;
    return len;
}

/*
 * Get the length of the name of a function or internal variable.
 * "arg" is advanced to the first non-white character after the name.
 * Return 0 if something is wrong.
 */
    static int
get_id_len(char_u **arg)
{
    char_u	*p;
    int		len;

    /* Find the end of the name. */
    for (p = *arg; eval_isnamec(*p); ++p)
    {
	if (*p == ':')
	{
	    /* "s:" is start of "s:var", but "n:" is not and can be used in
	     * slice "[n:]".  Also "xx:" is not a namespace. */
	    len = (int)(p - *arg);
	    if ((len == 1 && vim_strchr(NAMESPACE_CHAR, **arg) == NULL)
		    || len > 1)
		break;
	}
    }
    if (p == *arg)	    /* no name found */
	return 0;

    len = (int)(p - *arg);
    *arg = skipwhite(p);

    return len;
}

/*
 * Get the length of the name of a variable or function.
 * Only the name is recognized, does not handle ".key" or "[idx]".
 * "arg" is advanced to the first non-white character after the name.
 * Return -1 if curly braces expansion failed.
 * Return 0 if something else is wrong.
 * If the name contains 'magic' {}'s, expand them and return the
 * expanded name in an allocated string via 'alias' - caller must free.
 */
    static int
get_name_len(
    char_u	**arg,
    char_u	**alias,
    int		evaluate,
    int		verbose)
{
    int		len;
    char_u	*p;
    char_u	*expr_start;
    char_u	*expr_end;

    *alias = NULL;  /* default to no alias */

    if ((*arg)[0] == K_SPECIAL && (*arg)[1] == KS_EXTRA
						  && (*arg)[2] == (int)KE_SNR)
    {
	/* hard coded <SNR>, already translated */
	*arg += 3;
	return get_id_len(arg) + 3;
    }
    len = eval_fname_script(*arg);
    if (len > 0)
    {
	/* literal "<SID>", "s:" or "<SNR>" */
	*arg += len;
    }

    /*
     * Find the end of the name; check for {} construction.
     */
    p = find_name_end(*arg, &expr_start, &expr_end,
					       len > 0 ? 0 : FNE_CHECK_START);
    if (expr_start != NULL)
    {
	char_u	*temp_string;

	if (!evaluate)
	{
	    len += (int)(p - *arg);
	    *arg = skipwhite(p);
	    return len;
	}

	/*
	 * Include any <SID> etc in the expanded string:
	 * Thus the -len here.
	 */
	temp_string = make_expanded_name(*arg - len, expr_start, expr_end, p);
	if (temp_string == NULL)
	    return -1;
	*alias = temp_string;
	*arg = skipwhite(p);
	return (int)STRLEN(temp_string);
    }

    len += get_id_len(arg);
    if (len == 0 && verbose)
	EMSG2(_(e_invexpr2), *arg);

    return len;
}

/*
 * Find the end of a variable or function name, taking care of magic braces.
 * If "expr_start" is not NULL then "expr_start" and "expr_end" are set to the
 * start and end of the first magic braces item.
 * "flags" can have FNE_INCL_BR and FNE_CHECK_START.
 * Return a pointer to just after the name.  Equal to "arg" if there is no
 * valid name.
 */
    static char_u *
find_name_end(
    char_u	*arg,
    char_u	**expr_start,
    char_u	**expr_end,
    int		flags)
{
    int		mb_nest = 0;
    int		br_nest = 0;
    char_u	*p;
    int		len;

    if (expr_start != NULL)
    {
	*expr_start = NULL;
	*expr_end = NULL;
    }

    /* Quick check for valid starting character. */
    if ((flags & FNE_CHECK_START) && !eval_isnamec1(*arg) && *arg != '{')
	return arg;

    for (p = arg; *p != NUL
		    && (eval_isnamec(*p)
			|| *p == '{'
			|| ((flags & FNE_INCL_BR) && (*p == '[' || *p == '.'))
			|| mb_nest != 0
			|| br_nest != 0); mb_ptr_adv(p))
    {
	if (*p == '\'')
	{
	    /* skip over 'string' to avoid counting [ and ] inside it. */
	    for (p = p + 1; *p != NUL && *p != '\''; mb_ptr_adv(p))
		;
	    if (*p == NUL)
		break;
	}
	else if (*p == '"')
	{
	    /* skip over "str\"ing" to avoid counting [ and ] inside it. */
	    for (p = p + 1; *p != NUL && *p != '"'; mb_ptr_adv(p))
		if (*p == '\\' && p[1] != NUL)
		    ++p;
	    if (*p == NUL)
		break;
	}
	else if (br_nest == 0 && mb_nest == 0 && *p == ':')
	{
	    /* "s:" is start of "s:var", but "n:" is not and can be used in
	     * slice "[n:]".  Also "xx:" is not a namespace. But {ns}: is. */
	    len = (int)(p - arg);
	    if ((len == 1 && vim_strchr(NAMESPACE_CHAR, *arg) == NULL)
		    || (len > 1 && p[-1] != '}'))
		break;
	}

	if (mb_nest == 0)
	{
	    if (*p == '[')
		++br_nest;
	    else if (*p == ']')
		--br_nest;
	}

	if (br_nest == 0)
	{
	    if (*p == '{')
	    {
		mb_nest++;
		if (expr_start != NULL && *expr_start == NULL)
		    *expr_start = p;
	    }
	    else if (*p == '}')
	    {
		mb_nest--;
		if (expr_start != NULL && mb_nest == 0 && *expr_end == NULL)
		    *expr_end = p;
	    }
	}
    }

    return p;
}

/*
 * Expands out the 'magic' {}'s in a variable/function name.
 * Note that this can call itself recursively, to deal with
 * constructs like foo{bar}{baz}{bam}
 * The four pointer arguments point to "foo{expre}ss{ion}bar"
 *			"in_start"      ^
 *			"expr_start"	   ^
 *			"expr_end"		 ^
 *			"in_end"			    ^
 *
 * Returns a new allocated string, which the caller must free.
 * Returns NULL for failure.
 */
    static char_u *
make_expanded_name(
    char_u	*in_start,
    char_u	*expr_start,
    char_u	*expr_end,
    char_u	*in_end)
{
    char_u	c1;
    char_u	*retval = NULL;
    char_u	*temp_result;
    char_u	*nextcmd = NULL;

    if (expr_end == NULL || in_end == NULL)
	return NULL;
    *expr_start	= NUL;
    *expr_end = NUL;
    c1 = *in_end;
    *in_end = NUL;

    temp_result = eval_to_string(expr_start + 1, &nextcmd, FALSE);
    if (temp_result != NULL && nextcmd == NULL)
    {
	retval = alloc((unsigned)(STRLEN(temp_result) + (expr_start - in_start)
						   + (in_end - expr_end) + 1));
	if (retval != NULL)
	{
	    STRCPY(retval, in_start);
	    STRCAT(retval, temp_result);
	    STRCAT(retval, expr_end + 1);
	}
    }
    vim_free(temp_result);

    *in_end = c1;		/* put char back for error messages */
    *expr_start = '{';
    *expr_end = '}';

    if (retval != NULL)
    {
	temp_result = find_name_end(retval, &expr_start, &expr_end, 0);
	if (expr_start != NULL)
	{
	    /* Further expansion! */
	    temp_result = make_expanded_name(retval, expr_start,
						       expr_end, temp_result);
	    vim_free(retval);
	    retval = temp_result;
	}
    }

    return retval;
}

/*
 * Return TRUE if character "c" can be used in a variable or function name.
 * Does not include '{' or '}' for magic braces.
 */
    static int
eval_isnamec(int c)
{
    return (ASCII_ISALNUM(c) || c == '_' || c == ':' || c == AUTOLOAD_CHAR);
}

/*
 * Return TRUE if character "c" can be used as the first character in a
 * variable or function name (excluding '{' and '}').
 */
    static int
eval_isnamec1(int c)
{
    return (ASCII_ISALPHA(c) || c == '_');
}

/*
 * Set number v: variable to "val".
 */
    void
set_vim_var_nr(int idx, long val)
{
    vimvars[idx].vv_nr = val;
}

/*
 * Get number v: variable value.
 */
    long
get_vim_var_nr(int idx)
{
    return vimvars[idx].vv_nr;
}

/*
 * Get string v: variable value.  Uses a static buffer, can only be used once.
 */
    char_u *
get_vim_var_str(int idx)
{
    return get_tv_string(&vimvars[idx].vv_tv);
}

/*
 * Get List v: variable value.  Caller must take care of reference count when
 * needed.
 */
    list_T *
get_vim_var_list(int idx)
{
    return vimvars[idx].vv_list;
}

/*
 * Set v:char to character "c".
 */
    void
set_vim_var_char(int c)
{
    char_u	buf[MB_MAXBYTES + 1];

#ifdef FEAT_MBYTE
    if (has_mbyte)
	buf[(*mb_char2bytes)(c, buf)] = NUL;
    else
#endif
    {
	buf[0] = c;
	buf[1] = NUL;
    }
    set_vim_var_string(VV_CHAR, buf, -1);
}

/*
 * Set v:count to "count" and v:count1 to "count1".
 * When "set_prevcount" is TRUE first set v:prevcount from v:count.
 */
    void
set_vcount(
    long	count,
    long	count1,
    int		set_prevcount)
{
    if (set_prevcount)
	vimvars[VV_PREVCOUNT].vv_nr = vimvars[VV_COUNT].vv_nr;
    vimvars[VV_COUNT].vv_nr = count;
    vimvars[VV_COUNT1].vv_nr = count1;
}

/*
 * Set string v: variable to a copy of "val".
 */
    void
set_vim_var_string(
    int		idx,
    char_u	*val,
    int		len)	    /* length of "val" to use or -1 (whole string) */
{
    clear_tv(&vimvars[idx].vv_di.di_tv);
    vimvars[idx].vv_type = VAR_STRING;
    if (val == NULL)
	vimvars[idx].vv_str = NULL;
    else if (len == -1)
	vimvars[idx].vv_str = vim_strsave(val);
    else
	vimvars[idx].vv_str = vim_strnsave(val, len);
}

/*
 * Set List v: variable to "val".
 */
    void
set_vim_var_list(int idx, list_T *val)
{
    clear_tv(&vimvars[idx].vv_di.di_tv);
    vimvars[idx].vv_type = VAR_LIST;
    vimvars[idx].vv_list = val;
    if (val != NULL)
	++val->lv_refcount;
}

/*
 * Set Dictionary v: variable to "val".
 */
    void
set_vim_var_dict(int idx, dict_T *val)
{
    int		todo;
    hashitem_T	*hi;

    clear_tv(&vimvars[idx].vv_di.di_tv);
    vimvars[idx].vv_type = VAR_DICT;
    vimvars[idx].vv_dict = val;
    if (val != NULL)
    {
	++val->dv_refcount;

	/* Set readonly */
	todo = (int)val->dv_hashtab.ht_used;
	for (hi = val->dv_hashtab.ht_array; todo > 0 ; ++hi)
	{
	    if (HASHITEM_EMPTY(hi))
		continue;
	    --todo;
	    HI2DI(hi)->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
	}
    }
}

/*
 * Set v:register if needed.
 */
    void
set_reg_var(int c)
{
    char_u	regname;

    if (c == 0 || c == ' ')
	regname = '"';
    else
	regname = c;
    /* Avoid free/alloc when the value is already right. */
    if (vimvars[VV_REG].vv_str == NULL || vimvars[VV_REG].vv_str[0] != c)
	set_vim_var_string(VV_REG, &regname, 1);
}

/*
 * Get or set v:exception.  If "oldval" == NULL, return the current value.
 * Otherwise, restore the value to "oldval" and return NULL.
 * Must always be called in pairs to save and restore v:exception!  Does not
 * take care of memory allocations.
 */
    char_u *
v_exception(char_u *oldval)
{
    if (oldval == NULL)
	return vimvars[VV_EXCEPTION].vv_str;

    vimvars[VV_EXCEPTION].vv_str = oldval;
    return NULL;
}

/*
 * Get or set v:throwpoint.  If "oldval" == NULL, return the current value.
 * Otherwise, restore the value to "oldval" and return NULL.
 * Must always be called in pairs to save and restore v:throwpoint!  Does not
 * take care of memory allocations.
 */
    char_u *
v_throwpoint(char_u *oldval)
{
    if (oldval == NULL)
	return vimvars[VV_THROWPOINT].vv_str;

    vimvars[VV_THROWPOINT].vv_str = oldval;
    return NULL;
}

#if defined(FEAT_AUTOCMD) || defined(PROTO)
/*
 * Set v:cmdarg.
 * If "eap" != NULL, use "eap" to generate the value and return the old value.
 * If "oldarg" != NULL, restore the value to "oldarg" and return NULL.
 * Must always be called in pairs!
 */
    char_u *
set_cmdarg(exarg_T *eap, char_u *oldarg)
{
    char_u	*oldval;
    char_u	*newval;
    unsigned	len;

    oldval = vimvars[VV_CMDARG].vv_str;
    if (eap == NULL)
    {
	vim_free(oldval);
	vimvars[VV_CMDARG].vv_str = oldarg;
	return NULL;
    }

    if (eap->force_bin == FORCE_BIN)
	len = 6;
    else if (eap->force_bin == FORCE_NOBIN)
	len = 8;
    else
	len = 0;

    if (eap->read_edit)
	len += 7;

    if (eap->force_ff != 0)
	len += (unsigned)STRLEN(eap->cmd + eap->force_ff) + 6;
# ifdef FEAT_MBYTE
    if (eap->force_enc != 0)
	len += (unsigned)STRLEN(eap->cmd + eap->force_enc) + 7;
    if (eap->bad_char != 0)
	len += 7 + 4;  /* " ++bad=" + "keep" or "drop" */
# endif

    newval = alloc(len + 1);
    if (newval == NULL)
	return NULL;

    if (eap->force_bin == FORCE_BIN)
	sprintf((char *)newval, " ++bin");
    else if (eap->force_bin == FORCE_NOBIN)
	sprintf((char *)newval, " ++nobin");
    else
	*newval = NUL;

    if (eap->read_edit)
	STRCAT(newval, " ++edit");

    if (eap->force_ff != 0)
	sprintf((char *)newval + STRLEN(newval), " ++ff=%s",
						eap->cmd + eap->force_ff);
# ifdef FEAT_MBYTE
    if (eap->force_enc != 0)
	sprintf((char *)newval + STRLEN(newval), " ++enc=%s",
					       eap->cmd + eap->force_enc);
    if (eap->bad_char == BAD_KEEP)
	STRCPY(newval + STRLEN(newval), " ++bad=keep");
    else if (eap->bad_char == BAD_DROP)
	STRCPY(newval + STRLEN(newval), " ++bad=drop");
    else if (eap->bad_char != 0)
	sprintf((char *)newval + STRLEN(newval), " ++bad=%c", eap->bad_char);
# endif
    vimvars[VV_CMDARG].vv_str = newval;
    return oldval;
}
#endif

/*
 * Get the value of internal variable "name".
 * Return OK or FAIL.
 */
    static int
get_var_tv(
    char_u	*name,
    int		len,		/* length of "name" */
    typval_T	*rettv,		/* NULL when only checking existence */
    dictitem_T	**dip,		/* non-NULL when typval's dict item is needed */
    int		verbose,	/* may give error message */
    int		no_autoload)	/* do not use script autoloading */
{
    int		ret = OK;
    typval_T	*tv = NULL;
    typval_T	atv;
    dictitem_T	*v;
    int		cc;

    /* truncate the name, so that we can use strcmp() */
    cc = name[len];
    name[len] = NUL;

    /*
     * Check for "b:changedtick".
     */
    if (STRCMP(name, "b:changedtick") == 0)
    {
	atv.v_type = VAR_NUMBER;
	atv.vval.v_number = curbuf->b_changedtick;
	tv = &atv;
    }

    /*
     * Check for user-defined variables.
     */
    else
    {
	v = find_var(name, NULL, no_autoload);
	if (v != NULL)
	{
	    tv = &v->di_tv;
	    if (dip != NULL)
		*dip = v;
	}
    }

    if (tv == NULL)
    {
	if (rettv != NULL && verbose)
	    EMSG2(_(e_undefvar), name);
	ret = FAIL;
    }
    else if (rettv != NULL)
	copy_tv(tv, rettv);

    name[len] = cc;

    return ret;
}

/*
 * Handle expr[expr], expr[expr:expr] subscript and .name lookup.
 * Also handle function call with Funcref variable: func(expr)
 * Can all be combined: dict.func(expr)[idx]['func'](expr)
 */
    static int
handle_subscript(
    char_u	**arg,
    typval_T	*rettv,
    int		evaluate,	/* do more than finding the end */
    int		verbose)	/* give error messages */
{
    int		ret = OK;
    dict_T	*selfdict = NULL;
    char_u	*s;
    int		len;
    typval_T	functv;

    while (ret == OK
	    && (**arg == '['
		|| (**arg == '.' && rettv->v_type == VAR_DICT)
		|| (**arg == '(' && (!evaluate || rettv->v_type == VAR_FUNC)))
	    && !vim_iswhite(*(*arg - 1)))
    {
	if (**arg == '(')
	{
	    /* need to copy the funcref so that we can clear rettv */
	    if (evaluate)
	    {
		functv = *rettv;
		rettv->v_type = VAR_UNKNOWN;

		/* Invoke the function.  Recursive! */
		s = functv.vval.v_string;
	    }
	    else
		s = (char_u *)"";
	    ret = get_func_tv(s, (int)STRLEN(s), rettv, arg,
			curwin->w_cursor.lnum, curwin->w_cursor.lnum,
			&len, evaluate, selfdict);

	    /* Clear the funcref afterwards, so that deleting it while
	     * evaluating the arguments is possible (see test55). */
	    if (evaluate)
		clear_tv(&functv);

	    /* Stop the expression evaluation when immediately aborting on
	     * error, or when an interrupt occurred or an exception was thrown
	     * but not caught. */
	    if (aborting())
	    {
		if (ret == OK)
		    clear_tv(rettv);
		ret = FAIL;
	    }
	    dict_unref(selfdict);
	    selfdict = NULL;
	}
	else /* **arg == '[' || **arg == '.' */
	{
	    dict_unref(selfdict);
	    if (rettv->v_type == VAR_DICT)
	    {
		selfdict = rettv->vval.v_dict;
		if (selfdict != NULL)
		    ++selfdict->dv_refcount;
	    }
	    else
		selfdict = NULL;
	    if (eval_index(arg, rettv, evaluate, verbose) == FAIL)
	    {
		clear_tv(rettv);
		ret = FAIL;
	    }
	}
    }
    dict_unref(selfdict);
    return ret;
}

/*
 * Allocate memory for a variable type-value, and make it empty (0 or NULL
 * value).
 */
    typval_T *
alloc_tv(void)
{
    return (typval_T *)alloc_clear((unsigned)sizeof(typval_T));
}

/*
 * Allocate memory for a variable type-value, and assign a string to it.
 * The string "s" must have been allocated, it is consumed.
 * Return NULL for out of memory, the variable otherwise.
 */
    static typval_T *
alloc_string_tv(char_u *s)
{
    typval_T	*rettv;

    rettv = alloc_tv();
    if (rettv != NULL)
    {
	rettv->v_type = VAR_STRING;
	rettv->vval.v_string = s;
    }
    else
	vim_free(s);
    return rettv;
}

/*
 * Free the memory for a variable type-value.
 */
    void
free_tv(typval_T *varp)
{
    if (varp != NULL)
    {
	switch (varp->v_type)
	{
	    case VAR_FUNC:
		func_unref(varp->vval.v_string);
		/*FALLTHROUGH*/
	    case VAR_STRING:
		vim_free(varp->vval.v_string);
		break;
	    case VAR_LIST:
		list_unref(varp->vval.v_list);
		break;
	    case VAR_DICT:
		dict_unref(varp->vval.v_dict);
		break;
	    case VAR_NUMBER:
#ifdef FEAT_FLOAT
	    case VAR_FLOAT:
#endif
	    case VAR_UNKNOWN:
	    case VAR_SPECIAL:
		break;
	}
	vim_free(varp);
    }
}

/*
 * Free the memory for a variable value and set the value to NULL or 0.
 */
    void
clear_tv(typval_T *varp)
{
    if (varp != NULL)
    {
	switch (varp->v_type)
	{
	    case VAR_FUNC:
		func_unref(varp->vval.v_string);
		/*FALLTHROUGH*/
	    case VAR_STRING:
		vim_free(varp->vval.v_string);
		varp->vval.v_string = NULL;
		break;
	    case VAR_LIST:
		list_unref(varp->vval.v_list);
		varp->vval.v_list = NULL;
		break;
	    case VAR_DICT:
		dict_unref(varp->vval.v_dict);
		varp->vval.v_dict = NULL;
		break;
	    case VAR_NUMBER:
	    case VAR_SPECIAL:
		varp->vval.v_number = 0;
		break;
#ifdef FEAT_FLOAT
	    case VAR_FLOAT:
		varp->vval.v_float = 0.0;
		break;
#endif
	    case VAR_UNKNOWN:
		break;
	}
	varp->v_lock = 0;
    }
}

/*
 * Set the value of a variable to NULL without freeing items.
 */
    static void
init_tv(typval_T *varp)
{
    if (varp != NULL)
	vim_memset(varp, 0, sizeof(typval_T));
}

/*
 * Get the number value of a variable.
 * If it is a String variable, uses vim_str2nr().
 * For incompatible types, return 0.
 * get_tv_number_chk() is similar to get_tv_number(), but informs the
 * caller of incompatible types: it sets *denote to TRUE if "denote"
 * is not NULL or returns -1 otherwise.
 */
    static long
get_tv_number(typval_T *varp)
{
    int		error = FALSE;

    return get_tv_number_chk(varp, &error);	/* return 0L on error */
}

    long
get_tv_number_chk(typval_T *varp, int *denote)
{
    long	n = 0L;

    switch (varp->v_type)
    {
	case VAR_NUMBER:
	    return (long)(varp->vval.v_number);
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    EMSG(_("E805: Using a Float as a Number"));
	    break;
#endif
	case VAR_FUNC:
	    EMSG(_("E703: Using a Funcref as a Number"));
	    break;
	case VAR_STRING:
	    if (varp->vval.v_string != NULL)
		vim_str2nr(varp->vval.v_string, NULL, NULL,
						    STR2NR_ALL, &n, NULL, 0);
	    return n;
	case VAR_LIST:
	    EMSG(_("E745: Using a List as a Number"));
	    break;
	case VAR_DICT:
	    EMSG(_("E728: Using a Dictionary as a Number"));
	    break;
	case VAR_SPECIAL:
	    return varp->vval.v_number == VVAL_TRUE ? 1 : 0;
	    break;
	case VAR_UNKNOWN:
	    EMSG2(_(e_intern2), "get_tv_number(UNKNOWN)");
	    break;
    }
    if (denote == NULL)		/* useful for values that must be unsigned */
	n = -1;
    else
	*denote = TRUE;
    return n;
}

#ifdef FEAT_FLOAT
    static float_T
get_tv_float(typval_T *varp)
{
    switch (varp->v_type)
    {
	case VAR_NUMBER:
	    return (float_T)(varp->vval.v_number);
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    return varp->vval.v_float;
#endif
	case VAR_FUNC:
	    EMSG(_("E891: Using a Funcref as a Float"));
	    break;
	case VAR_STRING:
	    EMSG(_("E892: Using a String as a Float"));
	    break;
	case VAR_LIST:
	    EMSG(_("E893: Using a List as a Float"));
	    break;
	case VAR_DICT:
	    EMSG(_("E894: Using a Dictionary as a Float"));
	    break;
	case VAR_SPECIAL:
	    EMSG(_("E907: Using a special value as a Float"));
	    break;
	case VAR_UNKNOWN:
	    EMSG2(_(e_intern2), "get_tv_float(UNKNOWN)");
	    break;
    }
    return 0;
}
#endif

/*
 * Get the lnum from the first argument.
 * Also accepts ".", "$", etc., but that only works for the current buffer.
 * Returns -1 on error.
 */
    static linenr_T
get_tv_lnum(typval_T *argvars)
{
    typval_T	rettv;
    linenr_T	lnum;

    lnum = get_tv_number_chk(&argvars[0], NULL);
    if (lnum == 0)  /* no valid number, try using line() */
    {
	rettv.v_type = VAR_NUMBER;
	f_line(argvars, &rettv);
	lnum = rettv.vval.v_number;
	clear_tv(&rettv);
    }
    return lnum;
}

/*
 * Get the lnum from the first argument.
 * Also accepts "$", then "buf" is used.
 * Returns 0 on error.
 */
    static linenr_T
get_tv_lnum_buf(typval_T *argvars, buf_T *buf)
{
    if (argvars[0].v_type == VAR_STRING
	    && argvars[0].vval.v_string != NULL
	    && argvars[0].vval.v_string[0] == '$'
	    && buf != NULL)
	return buf->b_ml.ml_line_count;
    return get_tv_number_chk(&argvars[0], NULL);
}

/*
 * Get the string value of a variable.
 * If it is a Number variable, the number is converted into a string.
 * get_tv_string() uses a single, static buffer.  YOU CAN ONLY USE IT ONCE!
 * get_tv_string_buf() uses a given buffer.
 * If the String variable has never been set, return an empty string.
 * Never returns NULL;
 * get_tv_string_chk() and get_tv_string_buf_chk() are similar, but return
 * NULL on error.
 */
    static char_u *
get_tv_string(typval_T *varp)
{
    static char_u   mybuf[NUMBUFLEN];

    return get_tv_string_buf(varp, mybuf);
}

    static char_u *
get_tv_string_buf(typval_T *varp, char_u *buf)
{
    char_u	*res =  get_tv_string_buf_chk(varp, buf);

    return res != NULL ? res : (char_u *)"";
}

/*
 * Careful: This uses a single, static buffer.  YOU CAN ONLY USE IT ONCE!
 */
    char_u *
get_tv_string_chk(typval_T *varp)
{
    static char_u   mybuf[NUMBUFLEN];

    return get_tv_string_buf_chk(varp, mybuf);
}

    char_u *
get_tv_string_buf_chk(typval_T *varp, char_u *buf)
{
    switch (varp->v_type)
    {
	case VAR_NUMBER:
	    sprintf((char *)buf, "%ld", (long)varp->vval.v_number);
	    return buf;
	case VAR_FUNC:
	    EMSG(_("E729: using Funcref as a String"));
	    break;
	case VAR_LIST:
	    EMSG(_("E730: using List as a String"));
	    break;
	case VAR_DICT:
	    EMSG(_("E731: using Dictionary as a String"));
	    break;
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    EMSG(_(e_float_as_string));
	    break;
#endif
	case VAR_STRING:
	    if (varp->vval.v_string != NULL)
		return varp->vval.v_string;
	    return (char_u *)"";
	case VAR_SPECIAL:
	    STRCPY(buf, get_var_special_name(varp->vval.v_number));
	    return buf;
	case VAR_UNKNOWN:
	    EMSG(_("E908: using an invalid value as a String"));
	    break;
    }
    return NULL;
}

/*
 * Find variable "name" in the list of variables.
 * Return a pointer to it if found, NULL if not found.
 * Careful: "a:0" variables don't have a name.
 * When "htp" is not NULL we are writing to the variable, set "htp" to the
 * hashtab_T used.
 */
    static dictitem_T *
find_var(char_u *name, hashtab_T **htp, int no_autoload)
{
    char_u	*varname;
    hashtab_T	*ht;

    ht = find_var_ht(name, &varname);
    if (htp != NULL)
	*htp = ht;
    if (ht == NULL)
	return NULL;
    return find_var_in_ht(ht, *name, varname, no_autoload || htp != NULL);
}

/*
 * Find variable "varname" in hashtab "ht" with name "htname".
 * Returns NULL if not found.
 */
    static dictitem_T *
find_var_in_ht(
    hashtab_T	*ht,
    int		htname,
    char_u	*varname,
    int		no_autoload)
{
    hashitem_T	*hi;

    if (*varname == NUL)
    {
	/* Must be something like "s:", otherwise "ht" would be NULL. */
	switch (htname)
	{
	    case 's': return &SCRIPT_SV(current_SID)->sv_var;
	    case 'g': return &globvars_var;
	    case 'v': return &vimvars_var;
	    case 'b': return &curbuf->b_bufvar;
	    case 'w': return &curwin->w_winvar;
#ifdef FEAT_WINDOWS
	    case 't': return &curtab->tp_winvar;
#endif
	    case 'l': return current_funccal == NULL
					? NULL : &current_funccal->l_vars_var;
	    case 'a': return current_funccal == NULL
				       ? NULL : &current_funccal->l_avars_var;
	}
	return NULL;
    }

    hi = hash_find(ht, varname);
    if (HASHITEM_EMPTY(hi))
    {
	/* For global variables we may try auto-loading the script.  If it
	 * worked find the variable again.  Don't auto-load a script if it was
	 * loaded already, otherwise it would be loaded every time when
	 * checking if a function name is a Funcref variable. */
	if (ht == &globvarht && !no_autoload)
	{
	    /* Note: script_autoload() may make "hi" invalid. It must either
	     * be obtained again or not used. */
	    if (!script_autoload(varname, FALSE) || aborting())
		return NULL;
	    hi = hash_find(ht, varname);
	}
	if (HASHITEM_EMPTY(hi))
	    return NULL;
    }
    return HI2DI(hi);
}

/*
 * Find the hashtab used for a variable name.
 * Return NULL if the name is not valid.
 * Set "varname" to the start of name without ':'.
 */
    static hashtab_T *
find_var_ht(char_u *name, char_u **varname)
{
    hashitem_T	*hi;

    if (name[0] == NUL)
	return NULL;
    if (name[1] != ':')
    {
	/* The name must not start with a colon or #. */
	if (name[0] == ':' || name[0] == AUTOLOAD_CHAR)
	    return NULL;
	*varname = name;

	/* "version" is "v:version" in all scopes */
	hi = hash_find(&compat_hashtab, name);
	if (!HASHITEM_EMPTY(hi))
	    return &compat_hashtab;

	if (current_funccal == NULL)
	    return &globvarht;			/* global variable */
	return &get_funccal()->l_vars.dv_hashtab; /* l: variable */
    }
    *varname = name + 2;
    if (*name == 'g')				/* global variable */
	return &globvarht;
    /* There must be no ':' or '#' in the rest of the name, unless g: is used
     */
    if (vim_strchr(name + 2, ':') != NULL
			       || vim_strchr(name + 2, AUTOLOAD_CHAR) != NULL)
	return NULL;
    if (*name == 'b')				/* buffer variable */
	return &curbuf->b_vars->dv_hashtab;
    if (*name == 'w')				/* window variable */
	return &curwin->w_vars->dv_hashtab;
#ifdef FEAT_WINDOWS
    if (*name == 't')				/* tab page variable */
	return &curtab->tp_vars->dv_hashtab;
#endif
    if (*name == 'v')				/* v: variable */
	return &vimvarht;
    if (*name == 'a' && current_funccal != NULL) /* function argument */
	return &get_funccal()->l_avars.dv_hashtab;
    if (*name == 'l' && current_funccal != NULL) /* local function variable */
	return &get_funccal()->l_vars.dv_hashtab;
    if (*name == 's'				/* script variable */
	    && current_SID > 0 && current_SID <= ga_scripts.ga_len)
	return &SCRIPT_VARS(current_SID);
    return NULL;
}

/*
 * Get function call environment based on bactrace debug level
 */
    static funccall_T *
get_funccal(void)
{
    int		i;
    funccall_T	*funccal;
    funccall_T	*temp_funccal;

    funccal = current_funccal;
    if (debug_backtrace_level > 0)
    {
	for (i = 0; i < debug_backtrace_level; i++)
	{
	    temp_funccal = funccal->caller;
	    if (temp_funccal)
		funccal = temp_funccal;
	    else
		/* backtrace level overflow. reset to max */
		debug_backtrace_level = i;
	}
    }
    return funccal;
}

/*
 * Get the string value of a (global/local) variable.
 * Note: see get_tv_string() for how long the pointer remains valid.
 * Returns NULL when it doesn't exist.
 */
    char_u *
get_var_value(char_u *name)
{
    dictitem_T	*v;

    v = find_var(name, NULL, FALSE);
    if (v == NULL)
	return NULL;
    return get_tv_string(&v->di_tv);
}

/*
 * Allocate a new hashtab for a sourced script.  It will be used while
 * sourcing this script and when executing functions defined in the script.
 */
    void
new_script_vars(scid_T id)
{
    int		i;
    hashtab_T	*ht;
    scriptvar_T *sv;

    if (ga_grow(&ga_scripts, (int)(id - ga_scripts.ga_len)) == OK)
    {
	/* Re-allocating ga_data means that an ht_array pointing to
	 * ht_smallarray becomes invalid.  We can recognize this: ht_mask is
	 * at its init value.  Also reset "v_dict", it's always the same. */
	for (i = 1; i <= ga_scripts.ga_len; ++i)
	{
	    ht = &SCRIPT_VARS(i);
	    if (ht->ht_mask == HT_INIT_SIZE - 1)
		ht->ht_array = ht->ht_smallarray;
	    sv = SCRIPT_SV(i);
	    sv->sv_var.di_tv.vval.v_dict = &sv->sv_dict;
	}

	while (ga_scripts.ga_len < id)
	{
	    sv = SCRIPT_SV(ga_scripts.ga_len + 1) =
		(scriptvar_T *)alloc_clear(sizeof(scriptvar_T));
	    init_var_dict(&sv->sv_dict, &sv->sv_var, VAR_SCOPE);
	    ++ga_scripts.ga_len;
	}
    }
}

/*
 * Initialize dictionary "dict" as a scope and set variable "dict_var" to
 * point to it.
 */
    void
init_var_dict(dict_T *dict, dictitem_T *dict_var, int scope)
{
    hash_init(&dict->dv_hashtab);
    dict->dv_lock = 0;
    dict->dv_scope = scope;
    dict->dv_refcount = DO_NOT_FREE_CNT;
    dict->dv_copyID = 0;
    dict_var->di_tv.vval.v_dict = dict;
    dict_var->di_tv.v_type = VAR_DICT;
    dict_var->di_tv.v_lock = VAR_FIXED;
    dict_var->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
    dict_var->di_key[0] = NUL;
}

/*
 * Unreference a dictionary initialized by init_var_dict().
 */
    void
unref_var_dict(dict_T *dict)
{
    /* Now the dict needs to be freed if no one else is using it, go back to
     * normal reference counting. */
    dict->dv_refcount -= DO_NOT_FREE_CNT - 1;
    dict_unref(dict);
}

/*
 * Clean up a list of internal variables.
 * Frees all allocated variables and the value they contain.
 * Clears hashtab "ht", does not free it.
 */
    void
vars_clear(hashtab_T *ht)
{
    vars_clear_ext(ht, TRUE);
}

/*
 * Like vars_clear(), but only free the value if "free_val" is TRUE.
 */
    static void
vars_clear_ext(hashtab_T *ht, int free_val)
{
    int		todo;
    hashitem_T	*hi;
    dictitem_T	*v;

    hash_lock(ht);
    todo = (int)ht->ht_used;
    for (hi = ht->ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;

	    /* Free the variable.  Don't remove it from the hashtab,
	     * ht_array might change then.  hash_clear() takes care of it
	     * later. */
	    v = HI2DI(hi);
	    if (free_val)
		clear_tv(&v->di_tv);
	    if (v->di_flags & DI_FLAGS_ALLOC)
		vim_free(v);
	}
    }
    hash_clear(ht);
    ht->ht_used = 0;
}

/*
 * Delete a variable from hashtab "ht" at item "hi".
 * Clear the variable value and free the dictitem.
 */
    static void
delete_var(hashtab_T *ht, hashitem_T *hi)
{
    dictitem_T	*di = HI2DI(hi);

    hash_remove(ht, hi);
    clear_tv(&di->di_tv);
    vim_free(di);
}

/*
 * List the value of one internal variable.
 */
    static void
list_one_var(dictitem_T *v, char_u *prefix, int *first)
{
    char_u	*tofree;
    char_u	*s;
    char_u	numbuf[NUMBUFLEN];

    s = echo_string(&v->di_tv, &tofree, numbuf, get_copyID());
    list_one_var_a(prefix, v->di_key, v->di_tv.v_type,
					 s == NULL ? (char_u *)"" : s, first);
    vim_free(tofree);
}

    static void
list_one_var_a(
    char_u	*prefix,
    char_u	*name,
    int		type,
    char_u	*string,
    int		*first)  /* when TRUE clear rest of screen and set to FALSE */
{
    /* don't use msg() or msg_attr() to avoid overwriting "v:statusmsg" */
    msg_start();
    msg_puts(prefix);
    if (name != NULL)	/* "a:" vars don't have a name stored */
	msg_puts(name);
    msg_putchar(' ');
    msg_advance(22);
    if (type == VAR_NUMBER)
	msg_putchar('#');
    else if (type == VAR_FUNC)
	msg_putchar('*');
    else if (type == VAR_LIST)
    {
	msg_putchar('[');
	if (*string == '[')
	    ++string;
    }
    else if (type == VAR_DICT)
    {
	msg_putchar('{');
	if (*string == '{')
	    ++string;
    }
    else
	msg_putchar(' ');

    msg_outtrans(string);

    if (type == VAR_FUNC)
	msg_puts((char_u *)"()");
    if (*first)
    {
	msg_clr_eos();
	*first = FALSE;
    }
}

/*
 * Set variable "name" to value in "tv".
 * If the variable already exists, the value is updated.
 * Otherwise the variable is created.
 */
    static void
set_var(
    char_u	*name,
    typval_T	*tv,
    int		copy)	    /* make copy of value in "tv" */
{
    dictitem_T	*v;
    char_u	*varname;
    hashtab_T	*ht;

    ht = find_var_ht(name, &varname);
    if (ht == NULL || *varname == NUL)
    {
	EMSG2(_(e_illvar), name);
	return;
    }
    v = find_var_in_ht(ht, 0, varname, TRUE);

    if (tv->v_type == VAR_FUNC && var_check_func_name(name, v == NULL))
	return;

    if (v != NULL)
    {
	/* existing variable, need to clear the value */
	if (var_check_ro(v->di_flags, name, FALSE)
			       || tv_check_lock(v->di_tv.v_lock, name, FALSE))
	    return;
	if (v->di_tv.v_type != tv->v_type
		&& !((v->di_tv.v_type == VAR_STRING
			|| v->di_tv.v_type == VAR_NUMBER)
		    && (tv->v_type == VAR_STRING
			|| tv->v_type == VAR_NUMBER))
#ifdef FEAT_FLOAT
		&& !((v->di_tv.v_type == VAR_NUMBER
			|| v->di_tv.v_type == VAR_FLOAT)
		    && (tv->v_type == VAR_NUMBER
			|| tv->v_type == VAR_FLOAT))
#endif
		)
	{
	    EMSG2(_("E706: Variable type mismatch for: %s"), name);
	    return;
	}

	/*
	 * Handle setting internal v: variables separately where needed to
	 * prevent changing the type.
	 */
	if (ht == &vimvarht)
	{
	    if (v->di_tv.v_type == VAR_STRING)
	    {
		vim_free(v->di_tv.vval.v_string);
		if (copy || tv->v_type != VAR_STRING)
		    v->di_tv.vval.v_string = vim_strsave(get_tv_string(tv));
		else
		{
		    /* Take over the string to avoid an extra alloc/free. */
		    v->di_tv.vval.v_string = tv->vval.v_string;
		    tv->vval.v_string = NULL;
		}
		return;
	    }
	    else if (v->di_tv.v_type == VAR_NUMBER)
	    {
		v->di_tv.vval.v_number = get_tv_number(tv);
		if (STRCMP(varname, "searchforward") == 0)
		    set_search_direction(v->di_tv.vval.v_number ? '/' : '?');
#ifdef FEAT_SEARCH_EXTRA
		else if (STRCMP(varname, "hlsearch") == 0)
		{
		    no_hlsearch = !v->di_tv.vval.v_number;
		    redraw_all_later(SOME_VALID);
		}
#endif
		return;
	    }
	    else if (v->di_tv.v_type != tv->v_type)
		EMSG2(_(e_intern2), "set_var()");
	}

	clear_tv(&v->di_tv);
    }
    else		    /* add a new variable */
    {
	/* Can't add "v:" variable. */
	if (ht == &vimvarht)
	{
	    EMSG2(_(e_illvar), name);
	    return;
	}

	/* Make sure the variable name is valid. */
	if (!valid_varname(varname))
	    return;

	v = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T)
							  + STRLEN(varname)));
	if (v == NULL)
	    return;
	STRCPY(v->di_key, varname);
	if (hash_add(ht, DI2HIKEY(v)) == FAIL)
	{
	    vim_free(v);
	    return;
	}
	v->di_flags = DI_FLAGS_ALLOC;
    }

    if (copy || tv->v_type == VAR_NUMBER || tv->v_type == VAR_FLOAT)
	copy_tv(tv, &v->di_tv);
    else
    {
	v->di_tv = *tv;
	v->di_tv.v_lock = 0;
	init_tv(tv);
    }
}

/*
 * Return TRUE if di_flags "flags" indicates variable "name" is read-only.
 * Also give an error message.
 */
    static int
var_check_ro(int flags, char_u *name, int use_gettext)
{
    if (flags & DI_FLAGS_RO)
    {
	EMSG2(_(e_readonlyvar), use_gettext ? (char_u *)_(name) : name);
	return TRUE;
    }
    if ((flags & DI_FLAGS_RO_SBX) && sandbox)
    {
	EMSG2(_(e_readonlysbx), use_gettext ? (char_u *)_(name) : name);
	return TRUE;
    }
    return FALSE;
}

/*
 * Return TRUE if di_flags "flags" indicates variable "name" is fixed.
 * Also give an error message.
 */
    static int
var_check_fixed(int flags, char_u *name, int use_gettext)
{
    if (flags & DI_FLAGS_FIX)
    {
	EMSG2(_("E795: Cannot delete variable %s"),
				      use_gettext ? (char_u *)_(name) : name);
	return TRUE;
    }
    return FALSE;
}

/*
 * Check if a funcref is assigned to a valid variable name.
 * Return TRUE and give an error if not.
 */
    static int
var_check_func_name(
    char_u *name,    /* points to start of variable name */
    int    new_var)  /* TRUE when creating the variable */
{
    /* Allow for w: b: s: and t:. */
    if (!(vim_strchr((char_u *)"wbst", name[0]) != NULL && name[1] == ':')
	    && !ASCII_ISUPPER((name[0] != NUL && name[1] == ':')
						     ? name[2] : name[0]))
    {
	EMSG2(_("E704: Funcref variable name must start with a capital: %s"),
									name);
	return TRUE;
    }
    /* Don't allow hiding a function.  When "v" is not NULL we might be
     * assigning another function to the same var, the type is checked
     * below. */
    if (new_var && function_exists(name))
    {
	EMSG2(_("E705: Variable name conflicts with existing function: %s"),
								    name);
	return TRUE;
    }
    return FALSE;
}

/*
 * Check if a variable name is valid.
 * Return FALSE and give an error if not.
 */
    static int
valid_varname(char_u *varname)
{
    char_u *p;

    for (p = varname; *p != NUL; ++p)
	if (!eval_isnamec1(*p) && (p == varname || !VIM_ISDIGIT(*p))
						   && *p != AUTOLOAD_CHAR)
	{
	    EMSG2(_(e_illvar), varname);
	    return FALSE;
	}
    return TRUE;
}

/*
 * Return TRUE if typeval "tv" is set to be locked (immutable).
 * Also give an error message, using "name" or _("name") when use_gettext is
 * TRUE.
 */
    static int
tv_check_lock(int lock, char_u *name, int use_gettext)
{
    if (lock & VAR_LOCKED)
    {
	EMSG2(_("E741: Value is locked: %s"),
				name == NULL ? (char_u *)_("Unknown")
					     : use_gettext ? (char_u *)_(name)
					     : name);
	return TRUE;
    }
    if (lock & VAR_FIXED)
    {
	EMSG2(_("E742: Cannot change value of %s"),
				name == NULL ? (char_u *)_("Unknown")
					     : use_gettext ? (char_u *)_(name)
					     : name);
	return TRUE;
    }
    return FALSE;
}

/*
 * Copy the values from typval_T "from" to typval_T "to".
 * When needed allocates string or increases reference count.
 * Does not make a copy of a list or dict but copies the reference!
 * It is OK for "from" and "to" to point to the same item.  This is used to
 * make a copy later.
 */
    void
copy_tv(typval_T *from, typval_T *to)
{
    to->v_type = from->v_type;
    to->v_lock = 0;
    switch (from->v_type)
    {
	case VAR_NUMBER:
	case VAR_SPECIAL:
	    to->vval.v_number = from->vval.v_number;
	    break;
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
	    to->vval.v_float = from->vval.v_float;
	    break;
#endif
	case VAR_STRING:
	case VAR_FUNC:
	    if (from->vval.v_string == NULL)
		to->vval.v_string = NULL;
	    else
	    {
		to->vval.v_string = vim_strsave(from->vval.v_string);
		if (from->v_type == VAR_FUNC)
		    func_ref(to->vval.v_string);
	    }
	    break;
	case VAR_LIST:
	    if (from->vval.v_list == NULL)
		to->vval.v_list = NULL;
	    else
	    {
		to->vval.v_list = from->vval.v_list;
		++to->vval.v_list->lv_refcount;
	    }
	    break;
	case VAR_DICT:
	    if (from->vval.v_dict == NULL)
		to->vval.v_dict = NULL;
	    else
	    {
		to->vval.v_dict = from->vval.v_dict;
		++to->vval.v_dict->dv_refcount;
	    }
	    break;
	case VAR_UNKNOWN:
	    EMSG2(_(e_intern2), "copy_tv(UNKNOWN)");
	    break;
    }
}

/*
 * Make a copy of an item.
 * Lists and Dictionaries are also copied.  A deep copy if "deep" is set.
 * For deepcopy() "copyID" is zero for a full copy or the ID for when a
 * reference to an already copied list/dict can be used.
 * Returns FAIL or OK.
 */
    static int
item_copy(
    typval_T	*from,
    typval_T	*to,
    int		deep,
    int		copyID)
{
    static int	recurse = 0;
    int		ret = OK;

    if (recurse >= DICT_MAXNEST)
    {
	EMSG(_("E698: variable nested too deep for making a copy"));
	return FAIL;
    }
    ++recurse;

    switch (from->v_type)
    {
	case VAR_NUMBER:
#ifdef FEAT_FLOAT
	case VAR_FLOAT:
#endif
	case VAR_STRING:
	case VAR_FUNC:
	case VAR_SPECIAL:
	    copy_tv(from, to);
	    break;
	case VAR_LIST:
	    to->v_type = VAR_LIST;
	    to->v_lock = 0;
	    if (from->vval.v_list == NULL)
		to->vval.v_list = NULL;
	    else if (copyID != 0 && from->vval.v_list->lv_copyID == copyID)
	    {
		/* use the copy made earlier */
		to->vval.v_list = from->vval.v_list->lv_copylist;
		++to->vval.v_list->lv_refcount;
	    }
	    else
		to->vval.v_list = list_copy(from->vval.v_list, deep, copyID);
	    if (to->vval.v_list == NULL)
		ret = FAIL;
	    break;
	case VAR_DICT:
	    to->v_type = VAR_DICT;
	    to->v_lock = 0;
	    if (from->vval.v_dict == NULL)
		to->vval.v_dict = NULL;
	    else if (copyID != 0 && from->vval.v_dict->dv_copyID == copyID)
	    {
		/* use the copy made earlier */
		to->vval.v_dict = from->vval.v_dict->dv_copydict;
		++to->vval.v_dict->dv_refcount;
	    }
	    else
		to->vval.v_dict = dict_copy(from->vval.v_dict, deep, copyID);
	    if (to->vval.v_dict == NULL)
		ret = FAIL;
	    break;
	case VAR_UNKNOWN:
	    EMSG2(_(e_intern2), "item_copy(UNKNOWN)");
	    ret = FAIL;
    }
    --recurse;
    return ret;
}

/*
 * ":echo expr1 ..."	print each argument separated with a space, add a
 *			newline at the end.
 * ":echon expr1 ..."	print each argument plain.
 */
    void
ex_echo(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    typval_T	rettv;
    char_u	*tofree;
    char_u	*p;
    int		needclr = TRUE;
    int		atstart = TRUE;
    char_u	numbuf[NUMBUFLEN];

    if (eap->skip)
	++emsg_skip;
    while (*arg != NUL && *arg != '|' && *arg != '\n' && !got_int)
    {
	/* If eval1() causes an error message the text from the command may
	 * still need to be cleared. E.g., "echo 22,44". */
	need_clr_eos = needclr;

	p = arg;
	if (eval1(&arg, &rettv, !eap->skip) == FAIL)
	{
	    /*
	     * Report the invalid expression unless the expression evaluation
	     * has been cancelled due to an aborting error, an interrupt, or an
	     * exception.
	     */
	    if (!aborting())
		EMSG2(_(e_invexpr2), p);
	    need_clr_eos = FALSE;
	    break;
	}
	need_clr_eos = FALSE;

	if (!eap->skip)
	{
	    if (atstart)
	    {
		atstart = FALSE;
		/* Call msg_start() after eval1(), evaluating the expression
		 * may cause a message to appear. */
		if (eap->cmdidx == CMD_echo)
		{
		    /* Mark the saved text as finishing the line, so that what
		     * follows is displayed on a new line when scrolling back
		     * at the more prompt. */
		    msg_sb_eol();
		    msg_start();
		}
	    }
	    else if (eap->cmdidx == CMD_echo)
		msg_puts_attr((char_u *)" ", echo_attr);
	    p = echo_string(&rettv, &tofree, numbuf, get_copyID());
	    if (p != NULL)
		for ( ; *p != NUL && !got_int; ++p)
		{
		    if (*p == '\n' || *p == '\r' || *p == TAB)
		    {
			if (*p != TAB && needclr)
			{
			    /* remove any text still there from the command */
			    msg_clr_eos();
			    needclr = FALSE;
			}
			msg_putchar_attr(*p, echo_attr);
		    }
		    else
		    {
#ifdef FEAT_MBYTE
			if (has_mbyte)
			{
			    int i = (*mb_ptr2len)(p);

			    (void)msg_outtrans_len_attr(p, i, echo_attr);
			    p += i - 1;
			}
			else
#endif
			    (void)msg_outtrans_len_attr(p, 1, echo_attr);
		    }
		}
	    vim_free(tofree);
	}
	clear_tv(&rettv);
	arg = skipwhite(arg);
    }
    eap->nextcmd = check_nextcmd(arg);

    if (eap->skip)
	--emsg_skip;
    else
    {
	/* remove text that may still be there from the command */
	if (needclr)
	    msg_clr_eos();
	if (eap->cmdidx == CMD_echo)
	    msg_end();
    }
}

/*
 * ":echohl {name}".
 */
    void
ex_echohl(exarg_T *eap)
{
    int		id;

    id = syn_name2id(eap->arg);
    if (id == 0)
	echo_attr = 0;
    else
	echo_attr = syn_id2attr(id);
}

/*
 * ":execute expr1 ..."	execute the result of an expression.
 * ":echomsg expr1 ..."	Print a message
 * ":echoerr expr1 ..."	Print an error
 * Each gets spaces around each argument and a newline at the end for
 * echo commands
 */
    void
ex_execute(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    typval_T	rettv;
    int		ret = OK;
    char_u	*p;
    garray_T	ga;
    int		len;
    int		save_did_emsg;

    ga_init2(&ga, 1, 80);

    if (eap->skip)
	++emsg_skip;
    while (*arg != NUL && *arg != '|' && *arg != '\n')
    {
	p = arg;
	if (eval1(&arg, &rettv, !eap->skip) == FAIL)
	{
	    /*
	     * Report the invalid expression unless the expression evaluation
	     * has been cancelled due to an aborting error, an interrupt, or an
	     * exception.
	     */
	    if (!aborting())
		EMSG2(_(e_invexpr2), p);
	    ret = FAIL;
	    break;
	}

	if (!eap->skip)
	{
	    p = get_tv_string(&rettv);
	    len = (int)STRLEN(p);
	    if (ga_grow(&ga, len + 2) == FAIL)
	    {
		clear_tv(&rettv);
		ret = FAIL;
		break;
	    }
	    if (ga.ga_len)
		((char_u *)(ga.ga_data))[ga.ga_len++] = ' ';
	    STRCPY((char_u *)(ga.ga_data) + ga.ga_len, p);
	    ga.ga_len += len;
	}

	clear_tv(&rettv);
	arg = skipwhite(arg);
    }

    if (ret != FAIL && ga.ga_data != NULL)
    {
	if (eap->cmdidx == CMD_echomsg)
	{
	    MSG_ATTR(ga.ga_data, echo_attr);
	    out_flush();
	}
	else if (eap->cmdidx == CMD_echoerr)
	{
	    /* We don't want to abort following commands, restore did_emsg. */
	    save_did_emsg = did_emsg;
	    EMSG((char_u *)ga.ga_data);
	    if (!force_abort)
		did_emsg = save_did_emsg;
	}
	else if (eap->cmdidx == CMD_execute)
	    do_cmdline((char_u *)ga.ga_data,
		       eap->getline, eap->cookie, DOCMD_NOWAIT|DOCMD_VERBOSE);
    }

    ga_clear(&ga);

    if (eap->skip)
	--emsg_skip;

    eap->nextcmd = check_nextcmd(arg);
}

/*
 * Skip over the name of an option: "&option", "&g:option" or "&l:option".
 * "arg" points to the "&" or '+' when called, to "option" when returning.
 * Returns NULL when no option name found.  Otherwise pointer to the char
 * after the option name.
 */
    static char_u *
find_option_end(char_u **arg, int *opt_flags)
{
    char_u	*p = *arg;

    ++p;
    if (*p == 'g' && p[1] == ':')
    {
	*opt_flags = OPT_GLOBAL;
	p += 2;
    }
    else if (*p == 'l' && p[1] == ':')
    {
	*opt_flags = OPT_LOCAL;
	p += 2;
    }
    else
	*opt_flags = 0;

    if (!ASCII_ISALPHA(*p))
	return NULL;
    *arg = p;

    if (p[0] == 't' && p[1] == '_' && p[2] != NUL && p[3] != NUL)
	p += 4;	    /* termcap option */
    else
	while (ASCII_ISALPHA(*p))
	    ++p;
    return p;
}

/*
 * ":function"
 */
    void
ex_function(exarg_T *eap)
{
    char_u	*theline;
    int		i;
    int		j;
    int		c;
    int		saved_did_emsg;
    int		saved_wait_return = need_wait_return;
    char_u	*name = NULL;
    char_u	*p;
    char_u	*arg;
    char_u	*line_arg = NULL;
    garray_T	newargs;
    garray_T	newlines;
    int		varargs = FALSE;
    int		mustend = FALSE;
    int		flags = 0;
    ufunc_T	*fp;
    int		indent;
    int		nesting;
    char_u	*skip_until = NULL;
    dictitem_T	*v;
    funcdict_T	fudi;
    static int	func_nr = 0;	    /* number for nameless function */
    int		paren;
    hashtab_T	*ht;
    int		todo;
    hashitem_T	*hi;
    int		sourcing_lnum_off;

    /*
     * ":function" without argument: list functions.
     */
    if (ends_excmd(*eap->arg))
    {
	if (!eap->skip)
	{
	    todo = (int)func_hashtab.ht_used;
	    for (hi = func_hashtab.ht_array; todo > 0 && !got_int; ++hi)
	    {
		if (!HASHITEM_EMPTY(hi))
		{
		    --todo;
		    fp = HI2UF(hi);
		    if (!isdigit(*fp->uf_name))
			list_func_head(fp, FALSE);
		}
	    }
	}
	eap->nextcmd = check_nextcmd(eap->arg);
	return;
    }

    /*
     * ":function /pat": list functions matching pattern.
     */
    if (*eap->arg == '/')
    {
	p = skip_regexp(eap->arg + 1, '/', TRUE, NULL);
	if (!eap->skip)
	{
	    regmatch_T	regmatch;

	    c = *p;
	    *p = NUL;
	    regmatch.regprog = vim_regcomp(eap->arg + 1, RE_MAGIC);
	    *p = c;
	    if (regmatch.regprog != NULL)
	    {
		regmatch.rm_ic = p_ic;

		todo = (int)func_hashtab.ht_used;
		for (hi = func_hashtab.ht_array; todo > 0 && !got_int; ++hi)
		{
		    if (!HASHITEM_EMPTY(hi))
		    {
			--todo;
			fp = HI2UF(hi);
			if (!isdigit(*fp->uf_name)
				    && vim_regexec(&regmatch, fp->uf_name, 0))
			    list_func_head(fp, FALSE);
		    }
		}
		vim_regfree(regmatch.regprog);
	    }
	}
	if (*p == '/')
	    ++p;
	eap->nextcmd = check_nextcmd(p);
	return;
    }

    /*
     * Get the function name.  There are these situations:
     * func	    normal function name
     *		    "name" == func, "fudi.fd_dict" == NULL
     * dict.func    new dictionary entry
     *		    "name" == NULL, "fudi.fd_dict" set,
     *		    "fudi.fd_di" == NULL, "fudi.fd_newkey" == func
     * dict.func    existing dict entry with a Funcref
     *		    "name" == func, "fudi.fd_dict" set,
     *		    "fudi.fd_di" set, "fudi.fd_newkey" == NULL
     * dict.func    existing dict entry that's not a Funcref
     *		    "name" == NULL, "fudi.fd_dict" set,
     *		    "fudi.fd_di" set, "fudi.fd_newkey" == NULL
     * s:func	    script-local function name
     * g:func	    global function name, same as "func"
     */
    p = eap->arg;
    name = trans_function_name(&p, eap->skip, 0, &fudi);
    paren = (vim_strchr(p, '(') != NULL);
    if (name == NULL && (fudi.fd_dict == NULL || !paren) && !eap->skip)
    {
	/*
	 * Return on an invalid expression in braces, unless the expression
	 * evaluation has been cancelled due to an aborting error, an
	 * interrupt, or an exception.
	 */
	if (!aborting())
	{
	    if (!eap->skip && fudi.fd_newkey != NULL)
		EMSG2(_(e_dictkey), fudi.fd_newkey);
	    vim_free(fudi.fd_newkey);
	    return;
	}
	else
	    eap->skip = TRUE;
    }

    /* An error in a function call during evaluation of an expression in magic
     * braces should not cause the function not to be defined. */
    saved_did_emsg = did_emsg;
    did_emsg = FALSE;

    /*
     * ":function func" with only function name: list function.
     */
    if (!paren)
    {
	if (!ends_excmd(*skipwhite(p)))
	{
	    EMSG(_(e_trailing));
	    goto ret_free;
	}
	eap->nextcmd = check_nextcmd(p);
	if (eap->nextcmd != NULL)
	    *p = NUL;
	if (!eap->skip && !got_int)
	{
	    fp = find_func(name);
	    if (fp != NULL)
	    {
		list_func_head(fp, TRUE);
		for (j = 0; j < fp->uf_lines.ga_len && !got_int; ++j)
		{
		    if (FUNCLINE(fp, j) == NULL)
			continue;
		    msg_putchar('\n');
		    msg_outnum((long)(j + 1));
		    if (j < 9)
			msg_putchar(' ');
		    if (j < 99)
			msg_putchar(' ');
		    msg_prt_line(FUNCLINE(fp, j), FALSE);
		    out_flush();	/* show a line at a time */
		    ui_breakcheck();
		}
		if (!got_int)
		{
		    msg_putchar('\n');
		    msg_puts((char_u *)"   endfunction");
		}
	    }
	    else
		emsg_funcname(N_("E123: Undefined function: %s"), name);
	}
	goto ret_free;
    }

    /*
     * ":function name(arg1, arg2)" Define function.
     */
    p = skipwhite(p);
    if (*p != '(')
    {
	if (!eap->skip)
	{
	    EMSG2(_("E124: Missing '(': %s"), eap->arg);
	    goto ret_free;
	}
	/* attempt to continue by skipping some text */
	if (vim_strchr(p, '(') != NULL)
	    p = vim_strchr(p, '(');
    }
    p = skipwhite(p + 1);

    ga_init2(&newargs, (int)sizeof(char_u *), 3);
    ga_init2(&newlines, (int)sizeof(char_u *), 3);

    if (!eap->skip)
    {
	/* Check the name of the function.  Unless it's a dictionary function
	 * (that we are overwriting). */
	if (name != NULL)
	    arg = name;
	else
	    arg = fudi.fd_newkey;
	if (arg != NULL && (fudi.fd_di == NULL
				     || fudi.fd_di->di_tv.v_type != VAR_FUNC))
	{
	    if (*arg == K_SPECIAL)
		j = 3;
	    else
		j = 0;
	    while (arg[j] != NUL && (j == 0 ? eval_isnamec1(arg[j])
						      : eval_isnamec(arg[j])))
		++j;
	    if (arg[j] != NUL)
		emsg_funcname((char *)e_invarg2, arg);
	}
	/* Disallow using the g: dict. */
	if (fudi.fd_dict != NULL && fudi.fd_dict->dv_scope == VAR_DEF_SCOPE)
	    EMSG(_("E862: Cannot use g: here"));
    }

    /*
     * Isolate the arguments: "arg1, arg2, ...)"
     */
    while (*p != ')')
    {
	if (p[0] == '.' && p[1] == '.' && p[2] == '.')
	{
	    varargs = TRUE;
	    p += 3;
	    mustend = TRUE;
	}
	else
	{
	    arg = p;
	    while (ASCII_ISALNUM(*p) || *p == '_')
		++p;
	    if (arg == p || isdigit(*arg)
		    || (p - arg == 9 && STRNCMP(arg, "firstline", 9) == 0)
		    || (p - arg == 8 && STRNCMP(arg, "lastline", 8) == 0))
	    {
		if (!eap->skip)
		    EMSG2(_("E125: Illegal argument: %s"), arg);
		break;
	    }
	    if (ga_grow(&newargs, 1) == FAIL)
		goto erret;
	    c = *p;
	    *p = NUL;
	    arg = vim_strsave(arg);
	    if (arg == NULL)
		goto erret;

	    /* Check for duplicate argument name. */
	    for (i = 0; i < newargs.ga_len; ++i)
		if (STRCMP(((char_u **)(newargs.ga_data))[i], arg) == 0)
		{
		    EMSG2(_("E853: Duplicate argument name: %s"), arg);
		    vim_free(arg);
		    goto erret;
		}

	    ((char_u **)(newargs.ga_data))[newargs.ga_len] = arg;
	    *p = c;
	    newargs.ga_len++;
	    if (*p == ',')
		++p;
	    else
		mustend = TRUE;
	}
	p = skipwhite(p);
	if (mustend && *p != ')')
	{
	    if (!eap->skip)
		EMSG2(_(e_invarg2), eap->arg);
	    break;
	}
    }
    if (*p != ')')
	goto erret;
    ++p;	/* skip the ')' */

    /* find extra arguments "range", "dict" and "abort" */
    for (;;)
    {
	p = skipwhite(p);
	if (STRNCMP(p, "range", 5) == 0)
	{
	    flags |= FC_RANGE;
	    p += 5;
	}
	else if (STRNCMP(p, "dict", 4) == 0)
	{
	    flags |= FC_DICT;
	    p += 4;
	}
	else if (STRNCMP(p, "abort", 5) == 0)
	{
	    flags |= FC_ABORT;
	    p += 5;
	}
	else
	    break;
    }

    /* When there is a line break use what follows for the function body.
     * Makes 'exe "func Test()\n...\nendfunc"' work. */
    if (*p == '\n')
	line_arg = p + 1;
    else if (*p != NUL && *p != '"' && !eap->skip && !did_emsg)
	EMSG(_(e_trailing));

    /*
     * Read the body of the function, until ":endfunction" is found.
     */
    if (KeyTyped)
    {
	/* Check if the function already exists, don't let the user type the
	 * whole function before telling him it doesn't work!  For a script we
	 * need to skip the body to be able to find what follows. */
	if (!eap->skip && !eap->forceit)
	{
	    if (fudi.fd_dict != NULL && fudi.fd_newkey == NULL)
		EMSG(_(e_funcdict));
	    else if (name != NULL && find_func(name) != NULL)
		emsg_funcname(e_funcexts, name);
	}

	if (!eap->skip && did_emsg)
	    goto erret;

	msg_putchar('\n');	    /* don't overwrite the function name */
	cmdline_row = msg_row;
    }

    indent = 2;
    nesting = 0;
    for (;;)
    {
	if (KeyTyped)
	{
	    msg_scroll = TRUE;
	    saved_wait_return = FALSE;
	}
	need_wait_return = FALSE;
	sourcing_lnum_off = sourcing_lnum;

	if (line_arg != NULL)
	{
	    /* Use eap->arg, split up in parts by line breaks. */
	    theline = line_arg;
	    p = vim_strchr(theline, '\n');
	    if (p == NULL)
		line_arg += STRLEN(line_arg);
	    else
	    {
		*p = NUL;
		line_arg = p + 1;
	    }
	}
	else if (eap->getline == NULL)
	    theline = getcmdline(':', 0L, indent);
	else
	    theline = eap->getline(':', eap->cookie, indent);
	if (KeyTyped)
	    lines_left = Rows - 1;
	if (theline == NULL)
	{
	    EMSG(_("E126: Missing :endfunction"));
	    goto erret;
	}

	/* Detect line continuation: sourcing_lnum increased more than one. */
	if (sourcing_lnum > sourcing_lnum_off + 1)
	    sourcing_lnum_off = sourcing_lnum - sourcing_lnum_off - 1;
	else
	    sourcing_lnum_off = 0;

	if (skip_until != NULL)
	{
	    /* between ":append" and "." and between ":python <<EOF" and "EOF"
	     * don't check for ":endfunc". */
	    if (STRCMP(theline, skip_until) == 0)
	    {
		vim_free(skip_until);
		skip_until = NULL;
	    }
	}
	else
	{
	    /* skip ':' and blanks*/
	    for (p = theline; vim_iswhite(*p) || *p == ':'; ++p)
		;

	    /* Check for "endfunction". */
	    if (checkforcmd(&p, "endfunction", 4) && nesting-- == 0)
	    {
		if (line_arg == NULL)
		    vim_free(theline);
		break;
	    }

	    /* Increase indent inside "if", "while", "for" and "try", decrease
	     * at "end". */
	    if (indent > 2 && STRNCMP(p, "end", 3) == 0)
		indent -= 2;
	    else if (STRNCMP(p, "if", 2) == 0
		    || STRNCMP(p, "wh", 2) == 0
		    || STRNCMP(p, "for", 3) == 0
		    || STRNCMP(p, "try", 3) == 0)
		indent += 2;

	    /* Check for defining a function inside this function. */
	    if (checkforcmd(&p, "function", 2))
	    {
		if (*p == '!')
		    p = skipwhite(p + 1);
		p += eval_fname_script(p);
		vim_free(trans_function_name(&p, TRUE, 0, NULL));
		if (*skipwhite(p) == '(')
		{
		    ++nesting;
		    indent += 2;
		}
	    }

	    /* Check for ":append" or ":insert". */
	    p = skip_range(p, NULL);
	    if ((p[0] == 'a' && (!ASCII_ISALPHA(p[1]) || p[1] == 'p'))
		    || (p[0] == 'i'
			&& (!ASCII_ISALPHA(p[1]) || (p[1] == 'n'
				&& (!ASCII_ISALPHA(p[2]) || (p[2] == 's'))))))
		skip_until = vim_strsave((char_u *)".");

	    /* Check for ":python <<EOF", ":tcl <<EOF", etc. */
	    arg = skipwhite(skiptowhite(p));
	    if (arg[0] == '<' && arg[1] =='<'
		    && ((p[0] == 'p' && p[1] == 'y'
				    && (!ASCII_ISALPHA(p[2]) || p[2] == 't'))
			|| (p[0] == 'p' && p[1] == 'e'
				    && (!ASCII_ISALPHA(p[2]) || p[2] == 'r'))
			|| (p[0] == 't' && p[1] == 'c'
				    && (!ASCII_ISALPHA(p[2]) || p[2] == 'l'))
			|| (p[0] == 'l' && p[1] == 'u' && p[2] == 'a'
				    && !ASCII_ISALPHA(p[3]))
			|| (p[0] == 'r' && p[1] == 'u' && p[2] == 'b'
				    && (!ASCII_ISALPHA(p[3]) || p[3] == 'y'))
			|| (p[0] == 'm' && p[1] == 'z'
				    && (!ASCII_ISALPHA(p[2]) || p[2] == 's'))
			))
	    {
		/* ":python <<" continues until a dot, like ":append" */
		p = skipwhite(arg + 2);
		if (*p == NUL)
		    skip_until = vim_strsave((char_u *)".");
		else
		    skip_until = vim_strsave(p);
	    }
	}

	/* Add the line to the function. */
	if (ga_grow(&newlines, 1 + sourcing_lnum_off) == FAIL)
	{
	    if (line_arg == NULL)
		vim_free(theline);
	    goto erret;
	}

	/* Copy the line to newly allocated memory.  get_one_sourceline()
	 * allocates 250 bytes per line, this saves 80% on average.  The cost
	 * is an extra alloc/free. */
	p = vim_strsave(theline);
	if (p != NULL)
	{
	    if (line_arg == NULL)
		vim_free(theline);
	    theline = p;
	}

	((char_u **)(newlines.ga_data))[newlines.ga_len++] = theline;

	/* Add NULL lines for continuation lines, so that the line count is
	 * equal to the index in the growarray.   */
	while (sourcing_lnum_off-- > 0)
	    ((char_u **)(newlines.ga_data))[newlines.ga_len++] = NULL;

	/* Check for end of eap->arg. */
	if (line_arg != NULL && *line_arg == NUL)
	    line_arg = NULL;
    }

    /* Don't define the function when skipping commands or when an error was
     * detected. */
    if (eap->skip || did_emsg)
	goto erret;

    /*
     * If there are no errors, add the function
     */
    if (fudi.fd_dict == NULL)
    {
	v = find_var(name, &ht, FALSE);
	if (v != NULL && v->di_tv.v_type == VAR_FUNC)
	{
	    emsg_funcname(N_("E707: Function name conflicts with variable: %s"),
									name);
	    goto erret;
	}

	fp = find_func(name);
	if (fp != NULL)
	{
	    if (!eap->forceit)
	    {
		emsg_funcname(e_funcexts, name);
		goto erret;
	    }
	    if (fp->uf_calls > 0)
	    {
		emsg_funcname(N_("E127: Cannot redefine function %s: It is in use"),
									name);
		goto erret;
	    }
	    /* redefine existing function */
	    ga_clear_strings(&(fp->uf_args));
	    ga_clear_strings(&(fp->uf_lines));
	    vim_free(name);
	    name = NULL;
	}
    }
    else
    {
	char	numbuf[20];

	fp = NULL;
	if (fudi.fd_newkey == NULL && !eap->forceit)
	{
	    EMSG(_(e_funcdict));
	    goto erret;
	}
	if (fudi.fd_di == NULL)
	{
	    /* Can't add a function to a locked dictionary */
	    if (tv_check_lock(fudi.fd_dict->dv_lock, eap->arg, FALSE))
		goto erret;
	}
	    /* Can't change an existing function if it is locked */
	else if (tv_check_lock(fudi.fd_di->di_tv.v_lock, eap->arg, FALSE))
	    goto erret;

	/* Give the function a sequential number.  Can only be used with a
	 * Funcref! */
	vim_free(name);
	sprintf(numbuf, "%d", ++func_nr);
	name = vim_strsave((char_u *)numbuf);
	if (name == NULL)
	    goto erret;
    }

    if (fp == NULL)
    {
	if (fudi.fd_dict == NULL && vim_strchr(name, AUTOLOAD_CHAR) != NULL)
	{
	    int	    slen, plen;
	    char_u  *scriptname;

	    /* Check that the autoload name matches the script name. */
	    j = FAIL;
	    if (sourcing_name != NULL)
	    {
		scriptname = autoload_name(name);
		if (scriptname != NULL)
		{
		    p = vim_strchr(scriptname, '/');
		    plen = (int)STRLEN(p);
		    slen = (int)STRLEN(sourcing_name);
		    if (slen > plen && fnamecmp(p,
					    sourcing_name + slen - plen) == 0)
			j = OK;
		    vim_free(scriptname);
		}
	    }
	    if (j == FAIL)
	    {
		EMSG2(_("E746: Function name does not match script file name: %s"), name);
		goto erret;
	    }
	}

	fp = (ufunc_T *)alloc((unsigned)(sizeof(ufunc_T) + STRLEN(name)));
	if (fp == NULL)
	    goto erret;

	if (fudi.fd_dict != NULL)
	{
	    if (fudi.fd_di == NULL)
	    {
		/* add new dict entry */
		fudi.fd_di = dictitem_alloc(fudi.fd_newkey);
		if (fudi.fd_di == NULL)
		{
		    vim_free(fp);
		    goto erret;
		}
		if (dict_add(fudi.fd_dict, fudi.fd_di) == FAIL)
		{
		    vim_free(fudi.fd_di);
		    vim_free(fp);
		    goto erret;
		}
	    }
	    else
		/* overwrite existing dict entry */
		clear_tv(&fudi.fd_di->di_tv);
	    fudi.fd_di->di_tv.v_type = VAR_FUNC;
	    fudi.fd_di->di_tv.v_lock = 0;
	    fudi.fd_di->di_tv.vval.v_string = vim_strsave(name);
	    fp->uf_refcount = 1;

	    /* behave like "dict" was used */
	    flags |= FC_DICT;
	}

	/* insert the new function in the function list */
	STRCPY(fp->uf_name, name);
	if (hash_add(&func_hashtab, UF2HIKEY(fp)) == FAIL)
	{
	    vim_free(fp);
	    goto erret;
	}
    }
    fp->uf_args = newargs;
    fp->uf_lines = newlines;
#ifdef FEAT_PROFILE
    fp->uf_tml_count = NULL;
    fp->uf_tml_total = NULL;
    fp->uf_tml_self = NULL;
    fp->uf_profiling = FALSE;
    if (prof_def_func())
	func_do_profile(fp);
#endif
    fp->uf_varargs = varargs;
    fp->uf_flags = flags;
    fp->uf_calls = 0;
    fp->uf_script_ID = current_SID;
    goto ret_free;

erret:
    ga_clear_strings(&newargs);
    ga_clear_strings(&newlines);
ret_free:
    vim_free(skip_until);
    vim_free(fudi.fd_newkey);
    vim_free(name);
    did_emsg |= saved_did_emsg;
    need_wait_return |= saved_wait_return;
}

/*
 * Get a function name, translating "<SID>" and "<SNR>".
 * Also handles a Funcref in a List or Dictionary.
 * Returns the function name in allocated memory, or NULL for failure.
 * flags:
 * TFN_INT:	    internal function name OK
 * TFN_QUIET:	    be quiet
 * TFN_NO_AUTOLOAD: do not use script autoloading
 * Advances "pp" to just after the function name (if no error).
 */
    static char_u *
trans_function_name(
    char_u	**pp,
    int		skip,		/* only find the end, don't evaluate */
    int		flags,
    funcdict_T	*fdp)		/* return: info about dictionary used */
{
    char_u	*name = NULL;
    char_u	*start;
    char_u	*end;
    int		lead;
    char_u	sid_buf[20];
    int		len;
    lval_T	lv;

    if (fdp != NULL)
	vim_memset(fdp, 0, sizeof(funcdict_T));
    start = *pp;

    /* Check for hard coded <SNR>: already translated function ID (from a user
     * command). */
    if ((*pp)[0] == K_SPECIAL && (*pp)[1] == KS_EXTRA
						   && (*pp)[2] == (int)KE_SNR)
    {
	*pp += 3;
	len = get_id_len(pp) + 3;
	return vim_strnsave(start, len);
    }

    /* A name starting with "<SID>" or "<SNR>" is local to a script.  But
     * don't skip over "s:", get_lval() needs it for "s:dict.func". */
    lead = eval_fname_script(start);
    if (lead > 2)
	start += lead;

    /* Note that TFN_ flags use the same values as GLV_ flags. */
    end = get_lval(start, NULL, &lv, FALSE, skip, flags,
					      lead > 2 ? 0 : FNE_CHECK_START);
    if (end == start)
    {
	if (!skip)
	    EMSG(_("E129: Function name required"));
	goto theend;
    }
    if (end == NULL || (lv.ll_tv != NULL && (lead > 2 || lv.ll_range)))
    {
	/*
	 * Report an invalid expression in braces, unless the expression
	 * evaluation has been cancelled due to an aborting error, an
	 * interrupt, or an exception.
	 */
	if (!aborting())
	{
	    if (end != NULL)
		EMSG2(_(e_invarg2), start);
	}
	else
	    *pp = find_name_end(start, NULL, NULL, FNE_INCL_BR);
	goto theend;
    }

    if (lv.ll_tv != NULL)
    {
	if (fdp != NULL)
	{
	    fdp->fd_dict = lv.ll_dict;
	    fdp->fd_newkey = lv.ll_newkey;
	    lv.ll_newkey = NULL;
	    fdp->fd_di = lv.ll_di;
	}
	if (lv.ll_tv->v_type == VAR_FUNC && lv.ll_tv->vval.v_string != NULL)
	{
	    name = vim_strsave(lv.ll_tv->vval.v_string);
	    *pp = end;
	}
	else
	{
	    if (!skip && !(flags & TFN_QUIET) && (fdp == NULL
			     || lv.ll_dict == NULL || fdp->fd_newkey == NULL))
		EMSG(_(e_funcref));
	    else
		*pp = end;
	    name = NULL;
	}
	goto theend;
    }

    if (lv.ll_name == NULL)
    {
	/* Error found, but continue after the function name. */
	*pp = end;
	goto theend;
    }

    /* Check if the name is a Funcref.  If so, use the value. */
    if (lv.ll_exp_name != NULL)
    {
	len = (int)STRLEN(lv.ll_exp_name);
	name = deref_func_name(lv.ll_exp_name, &len, flags & TFN_NO_AUTOLOAD);
	if (name == lv.ll_exp_name)
	    name = NULL;
    }
    else
    {
	len = (int)(end - *pp);
	name = deref_func_name(*pp, &len, flags & TFN_NO_AUTOLOAD);
	if (name == *pp)
	    name = NULL;
    }
    if (name != NULL)
    {
	name = vim_strsave(name);
	*pp = end;
	if (STRNCMP(name, "<SNR>", 5) == 0)
	{
	    /* Change "<SNR>" to the byte sequence. */
	    name[0] = K_SPECIAL;
	    name[1] = KS_EXTRA;
	    name[2] = (int)KE_SNR;
	    mch_memmove(name + 3, name + 5, STRLEN(name + 5) + 1);
	}
	goto theend;
    }

    if (lv.ll_exp_name != NULL)
    {
	len = (int)STRLEN(lv.ll_exp_name);
	if (lead <= 2 && lv.ll_name == lv.ll_exp_name
					 && STRNCMP(lv.ll_name, "s:", 2) == 0)
	{
	    /* When there was "s:" already or the name expanded to get a
	     * leading "s:" then remove it. */
	    lv.ll_name += 2;
	    len -= 2;
	    lead = 2;
	}
    }
    else
    {
	/* skip over "s:" and "g:" */
	if (lead == 2 || (lv.ll_name[0] == 'g' && lv.ll_name[1] == ':'))
	    lv.ll_name += 2;
	len = (int)(end - lv.ll_name);
    }

    /*
     * Copy the function name to allocated memory.
     * Accept <SID>name() inside a script, translate into <SNR>123_name().
     * Accept <SNR>123_name() outside a script.
     */
    if (skip)
	lead = 0;	/* do nothing */
    else if (lead > 0)
    {
	lead = 3;
	if ((lv.ll_exp_name != NULL && eval_fname_sid(lv.ll_exp_name))
						       || eval_fname_sid(*pp))
	{
	    /* It's "s:" or "<SID>" */
	    if (current_SID <= 0)
	    {
		EMSG(_(e_usingsid));
		goto theend;
	    }
	    sprintf((char *)sid_buf, "%ld_", (long)current_SID);
	    lead += (int)STRLEN(sid_buf);
	}
    }
    else if (!(flags & TFN_INT) && builtin_function(lv.ll_name, len))
    {
	EMSG2(_("E128: Function name must start with a capital or \"s:\": %s"),
								       start);
	goto theend;
    }
    if (!skip && !(flags & TFN_QUIET))
    {
	char_u *cp = vim_strchr(lv.ll_name, ':');

	if (cp != NULL && cp < end)
	{
	    EMSG2(_("E884: Function name cannot contain a colon: %s"), start);
	    goto theend;
	}
    }

    name = alloc((unsigned)(len + lead + 1));
    if (name != NULL)
    {
	if (lead > 0)
	{
	    name[0] = K_SPECIAL;
	    name[1] = KS_EXTRA;
	    name[2] = (int)KE_SNR;
	    if (lead > 3)	/* If it's "<SID>" */
		STRCPY(name + 3, sid_buf);
	}
	mch_memmove(name + lead, lv.ll_name, (size_t)len);
	name[lead + len] = NUL;
    }
    *pp = end;

theend:
    clear_lval(&lv);
    return name;
}

/*
 * Return 5 if "p" starts with "<SID>" or "<SNR>" (ignoring case).
 * Return 2 if "p" starts with "s:".
 * Return 0 otherwise.
 */
    static int
eval_fname_script(char_u *p)
{
    /* Use MB_STRICMP() because in Turkish comparing the "I" may not work with
     * the standard library function. */
    if (p[0] == '<' && (MB_STRNICMP(p + 1, "SID>", 4) == 0
				       || MB_STRNICMP(p + 1, "SNR>", 4) == 0))
	return 5;
    if (p[0] == 's' && p[1] == ':')
	return 2;
    return 0;
}

/*
 * Return TRUE if "p" starts with "<SID>" or "s:".
 * Only works if eval_fname_script() returned non-zero for "p"!
 */
    static int
eval_fname_sid(char_u *p)
{
    return (*p == 's' || TOUPPER_ASC(p[2]) == 'I');
}

/*
 * List the head of the function: "name(arg1, arg2)".
 */
    static void
list_func_head(ufunc_T *fp, int indent)
{
    int		j;

    msg_start();
    if (indent)
	MSG_PUTS("   ");
    MSG_PUTS("function ");
    if (fp->uf_name[0] == K_SPECIAL)
    {
	MSG_PUTS_ATTR("<SNR>", hl_attr(HLF_8));
	msg_puts(fp->uf_name + 3);
    }
    else
	msg_puts(fp->uf_name);
    msg_putchar('(');
    for (j = 0; j < fp->uf_args.ga_len; ++j)
    {
	if (j)
	    MSG_PUTS(", ");
	msg_puts(FUNCARG(fp, j));
    }
    if (fp->uf_varargs)
    {
	if (j)
	    MSG_PUTS(", ");
	MSG_PUTS("...");
    }
    msg_putchar(')');
    if (fp->uf_flags & FC_ABORT)
	MSG_PUTS(" abort");
    if (fp->uf_flags & FC_RANGE)
	MSG_PUTS(" range");
    if (fp->uf_flags & FC_DICT)
	MSG_PUTS(" dict");
    msg_clr_eos();
    if (p_verbose > 0)
	last_set_msg(fp->uf_script_ID);
}

/*
 * Find a function by name, return pointer to it in ufuncs.
 * Return NULL for unknown function.
 */
    static ufunc_T *
find_func(char_u *name)
{
    hashitem_T	*hi;

    hi = hash_find(&func_hashtab, name);
    if (!HASHITEM_EMPTY(hi))
	return HI2UF(hi);
    return NULL;
}

#if defined(EXITFREE) || defined(PROTO)
    void
free_all_functions(void)
{
    hashitem_T	*hi;

    /* Need to start all over every time, because func_free() may change the
     * hash table. */
    while (func_hashtab.ht_used > 0)
	for (hi = func_hashtab.ht_array; ; ++hi)
	    if (!HASHITEM_EMPTY(hi))
	    {
		func_free(HI2UF(hi));
		break;
	    }
}
#endif

    int
translated_function_exists(char_u *name)
{
    if (builtin_function(name, -1))
	return find_internal_func(name) >= 0;
    return find_func(name) != NULL;
}

/*
 * Return TRUE if a function "name" exists.
 */
    static int
function_exists(char_u *name)
{
    char_u  *nm = name;
    char_u  *p;
    int	    n = FALSE;

    p = trans_function_name(&nm, FALSE, TFN_INT|TFN_QUIET|TFN_NO_AUTOLOAD,
			    NULL);
    nm = skipwhite(nm);

    /* Only accept "funcname", "funcname ", "funcname (..." and
     * "funcname(...", not "funcname!...". */
    if (p != NULL && (*nm == NUL || *nm == '('))
	n = translated_function_exists(p);
    vim_free(p);
    return n;
}

    char_u *
get_expanded_name(char_u *name, int check)
{
    char_u	*nm = name;
    char_u	*p;

    p = trans_function_name(&nm, FALSE, TFN_INT|TFN_QUIET, NULL);

    if (p != NULL && *nm == NUL)
	if (!check || translated_function_exists(p))
	    return p;

    vim_free(p);
    return NULL;
}

/*
 * Return TRUE if "name" looks like a builtin function name: starts with a
 * lower case letter and doesn't contain AUTOLOAD_CHAR.
 * "len" is the length of "name", or -1 for NUL terminated.
 */
    static int
builtin_function(char_u *name, int len)
{
    char_u *p;

    if (!ASCII_ISLOWER(name[0]))
	return FALSE;
    p = vim_strchr(name, AUTOLOAD_CHAR);
    return p == NULL || (len > 0 && p > name + len);
}

#if defined(FEAT_PROFILE) || defined(PROTO)
/*
 * Start profiling function "fp".
 */
    static void
func_do_profile(ufunc_T *fp)
{
    int		len = fp->uf_lines.ga_len;

    if (len == 0)
	len = 1;  /* avoid getting error for allocating zero bytes */
    fp->uf_tm_count = 0;
    profile_zero(&fp->uf_tm_self);
    profile_zero(&fp->uf_tm_total);
    if (fp->uf_tml_count == NULL)
	fp->uf_tml_count = (int *)alloc_clear((unsigned) (sizeof(int) * len));
    if (fp->uf_tml_total == NULL)
	fp->uf_tml_total = (proftime_T *)alloc_clear((unsigned)
						  (sizeof(proftime_T) * len));
    if (fp->uf_tml_self == NULL)
	fp->uf_tml_self = (proftime_T *)alloc_clear((unsigned)
						  (sizeof(proftime_T) * len));
    fp->uf_tml_idx = -1;
    if (fp->uf_tml_count == NULL || fp->uf_tml_total == NULL
						   || fp->uf_tml_self == NULL)
	return;	    /* out of memory */

    fp->uf_profiling = TRUE;
}

/*
 * Dump the profiling results for all functions in file "fd".
 */
    void
func_dump_profile(FILE *fd)
{
    hashitem_T	*hi;
    int		todo;
    ufunc_T	*fp;
    int		i;
    ufunc_T	**sorttab;
    int		st_len = 0;

    todo = (int)func_hashtab.ht_used;
    if (todo == 0)
	return;     /* nothing to dump */

    sorttab = (ufunc_T **)alloc((unsigned)(sizeof(ufunc_T *) * todo));

    for (hi = func_hashtab.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    fp = HI2UF(hi);
	    if (fp->uf_profiling)
	    {
		if (sorttab != NULL)
		    sorttab[st_len++] = fp;

		if (fp->uf_name[0] == K_SPECIAL)
		    fprintf(fd, "FUNCTION  <SNR>%s()\n", fp->uf_name + 3);
		else
		    fprintf(fd, "FUNCTION  %s()\n", fp->uf_name);
		if (fp->uf_tm_count == 1)
		    fprintf(fd, "Called 1 time\n");
		else
		    fprintf(fd, "Called %d times\n", fp->uf_tm_count);
		fprintf(fd, "Total time: %s\n", profile_msg(&fp->uf_tm_total));
		fprintf(fd, " Self time: %s\n", profile_msg(&fp->uf_tm_self));
		fprintf(fd, "\n");
		fprintf(fd, "count  total (s)   self (s)\n");

		for (i = 0; i < fp->uf_lines.ga_len; ++i)
		{
		    if (FUNCLINE(fp, i) == NULL)
			continue;
		    prof_func_line(fd, fp->uf_tml_count[i],
			     &fp->uf_tml_total[i], &fp->uf_tml_self[i], TRUE);
		    fprintf(fd, "%s\n", FUNCLINE(fp, i));
		}
		fprintf(fd, "\n");
	    }
	}
    }

    if (sorttab != NULL && st_len > 0)
    {
	qsort((void *)sorttab, (size_t)st_len, sizeof(ufunc_T *),
							      prof_total_cmp);
	prof_sort_list(fd, sorttab, st_len, "TOTAL", FALSE);
	qsort((void *)sorttab, (size_t)st_len, sizeof(ufunc_T *),
							      prof_self_cmp);
	prof_sort_list(fd, sorttab, st_len, "SELF", TRUE);
    }

    vim_free(sorttab);
}

    static void
prof_sort_list(
    FILE	*fd,
    ufunc_T	**sorttab,
    int		st_len,
    char	*title,
    int		prefer_self)	/* when equal print only self time */
{
    int		i;
    ufunc_T	*fp;

    fprintf(fd, "FUNCTIONS SORTED ON %s TIME\n", title);
    fprintf(fd, "count  total (s)   self (s)  function\n");
    for (i = 0; i < 20 && i < st_len; ++i)
    {
	fp = sorttab[i];
	prof_func_line(fd, fp->uf_tm_count, &fp->uf_tm_total, &fp->uf_tm_self,
								 prefer_self);
	if (fp->uf_name[0] == K_SPECIAL)
	    fprintf(fd, " <SNR>%s()\n", fp->uf_name + 3);
	else
	    fprintf(fd, " %s()\n", fp->uf_name);
    }
    fprintf(fd, "\n");
}

/*
 * Print the count and times for one function or function line.
 */
    static void
prof_func_line(
    FILE	*fd,
    int		count,
    proftime_T	*total,
    proftime_T	*self,
    int		prefer_self)	/* when equal print only self time */
{
    if (count > 0)
    {
	fprintf(fd, "%5d ", count);
	if (prefer_self && profile_equal(total, self))
	    fprintf(fd, "           ");
	else
	    fprintf(fd, "%s ", profile_msg(total));
	if (!prefer_self && profile_equal(total, self))
	    fprintf(fd, "           ");
	else
	    fprintf(fd, "%s ", profile_msg(self));
    }
    else
	fprintf(fd, "                            ");
}

/*
 * Compare function for total time sorting.
 */
    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
prof_total_cmp(const void *s1, const void *s2)
{
    ufunc_T	*p1, *p2;

    p1 = *(ufunc_T **)s1;
    p2 = *(ufunc_T **)s2;
    return profile_cmp(&p1->uf_tm_total, &p2->uf_tm_total);
}

/*
 * Compare function for self time sorting.
 */
    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
prof_self_cmp(const void *s1, const void *s2)
{
    ufunc_T	*p1, *p2;

    p1 = *(ufunc_T **)s1;
    p2 = *(ufunc_T **)s2;
    return profile_cmp(&p1->uf_tm_self, &p2->uf_tm_self);
}

#endif

/*
 * If "name" has a package name try autoloading the script for it.
 * Return TRUE if a package was loaded.
 */
    static int
script_autoload(
    char_u	*name,
    int		reload)	    /* load script again when already loaded */
{
    char_u	*p;
    char_u	*scriptname, *tofree;
    int		ret = FALSE;
    int		i;

    /* If there is no '#' after name[0] there is no package name. */
    p = vim_strchr(name, AUTOLOAD_CHAR);
    if (p == NULL || p == name)
	return FALSE;

    tofree = scriptname = autoload_name(name);

    /* Find the name in the list of previously loaded package names.  Skip
     * "autoload/", it's always the same. */
    for (i = 0; i < ga_loaded.ga_len; ++i)
	if (STRCMP(((char_u **)ga_loaded.ga_data)[i] + 9, scriptname + 9) == 0)
	    break;
    if (!reload && i < ga_loaded.ga_len)
	ret = FALSE;	    /* was loaded already */
    else
    {
	/* Remember the name if it wasn't loaded already. */
	if (i == ga_loaded.ga_len && ga_grow(&ga_loaded, 1) == OK)
	{
	    ((char_u **)ga_loaded.ga_data)[ga_loaded.ga_len++] = scriptname;
	    tofree = NULL;
	}

	/* Try loading the package from $VIMRUNTIME/autoload/<name>.vim */
	if (source_runtime(scriptname, FALSE) == OK)
	    ret = TRUE;
    }

    vim_free(tofree);
    return ret;
}

/*
 * Return the autoload script name for a function or variable name.
 * Returns NULL when out of memory.
 */
    static char_u *
autoload_name(char_u *name)
{
    char_u	*p;
    char_u	*scriptname;

    /* Get the script file name: replace '#' with '/', append ".vim". */
    scriptname = alloc((unsigned)(STRLEN(name) + 14));
    if (scriptname == NULL)
	return FALSE;
    STRCPY(scriptname, "autoload/");
    STRCAT(scriptname, name);
    *vim_strrchr(scriptname, AUTOLOAD_CHAR) = NUL;
    STRCAT(scriptname, ".vim");
    while ((p = vim_strchr(scriptname, AUTOLOAD_CHAR)) != NULL)
	*p = '/';
    return scriptname;
}

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)

/*
 * Function given to ExpandGeneric() to obtain the list of user defined
 * function names.
 */
    char_u *
get_user_func_name(expand_T *xp, int idx)
{
    static long_u	done;
    static hashitem_T	*hi;
    ufunc_T		*fp;

    if (idx == 0)
    {
	done = 0;
	hi = func_hashtab.ht_array;
    }
    if (done < func_hashtab.ht_used)
    {
	if (done++ > 0)
	    ++hi;
	while (HASHITEM_EMPTY(hi))
	    ++hi;
	fp = HI2UF(hi);

	if (fp->uf_flags & FC_DICT)
	    return (char_u *)""; /* don't show dict functions */

	if (STRLEN(fp->uf_name) + 4 >= IOSIZE)
	    return fp->uf_name;	/* prevents overflow */

	cat_func_name(IObuff, fp);
	if (xp->xp_context != EXPAND_USER_FUNC)
	{
	    STRCAT(IObuff, "(");
	    if (!fp->uf_varargs && fp->uf_args.ga_len == 0)
		STRCAT(IObuff, ")");
	}
	return IObuff;
    }
    return NULL;
}

#endif /* FEAT_CMDL_COMPL */

/*
 * Copy the function name of "fp" to buffer "buf".
 * "buf" must be able to hold the function name plus three bytes.
 * Takes care of script-local function names.
 */
    static void
cat_func_name(char_u *buf, ufunc_T *fp)
{
    if (fp->uf_name[0] == K_SPECIAL)
    {
	STRCPY(buf, "<SNR>");
	STRCAT(buf, fp->uf_name + 3);
    }
    else
	STRCPY(buf, fp->uf_name);
}

/*
 * ":delfunction {name}"
 */
    void
ex_delfunction(exarg_T *eap)
{
    ufunc_T	*fp = NULL;
    char_u	*p;
    char_u	*name;
    funcdict_T	fudi;

    p = eap->arg;
    name = trans_function_name(&p, eap->skip, 0, &fudi);
    vim_free(fudi.fd_newkey);
    if (name == NULL)
    {
	if (fudi.fd_dict != NULL && !eap->skip)
	    EMSG(_(e_funcref));
	return;
    }
    if (!ends_excmd(*skipwhite(p)))
    {
	vim_free(name);
	EMSG(_(e_trailing));
	return;
    }
    eap->nextcmd = check_nextcmd(p);
    if (eap->nextcmd != NULL)
	*p = NUL;

    if (!eap->skip)
	fp = find_func(name);
    vim_free(name);

    if (!eap->skip)
    {
	if (fp == NULL)
	{
	    EMSG2(_(e_nofunc), eap->arg);
	    return;
	}
	if (fp->uf_calls > 0)
	{
	    EMSG2(_("E131: Cannot delete function %s: It is in use"), eap->arg);
	    return;
	}

	if (fudi.fd_dict != NULL)
	{
	    /* Delete the dict item that refers to the function, it will
	     * invoke func_unref() and possibly delete the function. */
	    dictitem_remove(fudi.fd_dict, fudi.fd_di);
	}
	else
	    func_free(fp);
    }
}

/*
 * Free a function and remove it from the list of functions.
 */
    static void
func_free(ufunc_T *fp)
{
    hashitem_T	*hi;

    /* clear this function */
    ga_clear_strings(&(fp->uf_args));
    ga_clear_strings(&(fp->uf_lines));
#ifdef FEAT_PROFILE
    vim_free(fp->uf_tml_count);
    vim_free(fp->uf_tml_total);
    vim_free(fp->uf_tml_self);
#endif

    /* remove the function from the function hashtable */
    hi = hash_find(&func_hashtab, UF2HIKEY(fp));
    if (HASHITEM_EMPTY(hi))
	EMSG2(_(e_intern2), "func_free()");
    else
	hash_remove(&func_hashtab, hi);

    vim_free(fp);
}

/*
 * Unreference a Function: decrement the reference count and free it when it
 * becomes zero.  Only for numbered functions.
 */
    void
func_unref(char_u *name)
{
    ufunc_T *fp;

    if (name != NULL && isdigit(*name))
    {
	fp = find_func(name);
	if (fp == NULL)
	    EMSG2(_(e_intern2), "func_unref()");
	else if (--fp->uf_refcount <= 0)
	{
	    /* Only delete it when it's not being used.  Otherwise it's done
	     * when "uf_calls" becomes zero. */
	    if (fp->uf_calls == 0)
		func_free(fp);
	}
    }
}

/*
 * Count a reference to a Function.
 */
    void
func_ref(char_u *name)
{
    ufunc_T *fp;

    if (name != NULL && isdigit(*name))
    {
	fp = find_func(name);
	if (fp == NULL)
	    EMSG2(_(e_intern2), "func_ref()");
	else
	    ++fp->uf_refcount;
    }
}

/*
 * Call a user function.
 */
    static void
call_user_func(
    ufunc_T	*fp,		/* pointer to function */
    int		argcount,	/* nr of args */
    typval_T	*argvars,	/* arguments */
    typval_T	*rettv,		/* return value */
    linenr_T	firstline,	/* first line of range */
    linenr_T	lastline,	/* last line of range */
    dict_T	*selfdict)	/* Dictionary for "self" */
{
    char_u	*save_sourcing_name;
    linenr_T	save_sourcing_lnum;
    scid_T	save_current_SID;
    funccall_T	*fc;
    int		save_did_emsg;
    static int	depth = 0;
    dictitem_T	*v;
    int		fixvar_idx = 0;	/* index in fixvar[] */
    int		i;
    int		ai;
    char_u	numbuf[NUMBUFLEN];
    char_u	*name;
    size_t	len;
#ifdef FEAT_PROFILE
    proftime_T	wait_start;
    proftime_T	call_start;
#endif

    /* If depth of calling is getting too high, don't execute the function */
    if (depth >= p_mfd)
    {
	EMSG(_("E132: Function call depth is higher than 'maxfuncdepth'"));
	rettv->v_type = VAR_NUMBER;
	rettv->vval.v_number = -1;
	return;
    }
    ++depth;

    line_breakcheck();		/* check for CTRL-C hit */

    fc = (funccall_T *)alloc(sizeof(funccall_T));
    fc->caller = current_funccal;
    current_funccal = fc;
    fc->func = fp;
    fc->rettv = rettv;
    rettv->vval.v_number = 0;
    fc->linenr = 0;
    fc->returned = FALSE;
    fc->level = ex_nesting_level;
    /* Check if this function has a breakpoint. */
    fc->breakpoint = dbg_find_breakpoint(FALSE, fp->uf_name, (linenr_T)0);
    fc->dbg_tick = debug_tick;

    /*
     * Note about using fc->fixvar[]: This is an array of FIXVAR_CNT variables
     * with names up to VAR_SHORT_LEN long.  This avoids having to alloc/free
     * each argument variable and saves a lot of time.
     */
    /*
     * Init l: variables.
     */
    init_var_dict(&fc->l_vars, &fc->l_vars_var, VAR_DEF_SCOPE);
    if (selfdict != NULL)
    {
	/* Set l:self to "selfdict".  Use "name" to avoid a warning from
	 * some compiler that checks the destination size. */
	v = &fc->fixvar[fixvar_idx++].var;
	name = v->di_key;
	STRCPY(name, "self");
	v->di_flags = DI_FLAGS_RO + DI_FLAGS_FIX;
	hash_add(&fc->l_vars.dv_hashtab, DI2HIKEY(v));
	v->di_tv.v_type = VAR_DICT;
	v->di_tv.v_lock = 0;
	v->di_tv.vval.v_dict = selfdict;
	++selfdict->dv_refcount;
    }

    /*
     * Init a: variables.
     * Set a:0 to "argcount".
     * Set a:000 to a list with room for the "..." arguments.
     */
    init_var_dict(&fc->l_avars, &fc->l_avars_var, VAR_SCOPE);
    add_nr_var(&fc->l_avars, &fc->fixvar[fixvar_idx++].var, "0",
				(varnumber_T)(argcount - fp->uf_args.ga_len));
    /* Use "name" to avoid a warning from some compiler that checks the
     * destination size. */
    v = &fc->fixvar[fixvar_idx++].var;
    name = v->di_key;
    STRCPY(name, "000");
    v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
    hash_add(&fc->l_avars.dv_hashtab, DI2HIKEY(v));
    v->di_tv.v_type = VAR_LIST;
    v->di_tv.v_lock = VAR_FIXED;
    v->di_tv.vval.v_list = &fc->l_varlist;
    vim_memset(&fc->l_varlist, 0, sizeof(list_T));
    fc->l_varlist.lv_refcount = DO_NOT_FREE_CNT;
    fc->l_varlist.lv_lock = VAR_FIXED;

    /*
     * Set a:firstline to "firstline" and a:lastline to "lastline".
     * Set a:name to named arguments.
     * Set a:N to the "..." arguments.
     */
    add_nr_var(&fc->l_avars, &fc->fixvar[fixvar_idx++].var, "firstline",
						      (varnumber_T)firstline);
    add_nr_var(&fc->l_avars, &fc->fixvar[fixvar_idx++].var, "lastline",
						       (varnumber_T)lastline);
    for (i = 0; i < argcount; ++i)
    {
	ai = i - fp->uf_args.ga_len;
	if (ai < 0)
	    /* named argument a:name */
	    name = FUNCARG(fp, i);
	else
	{
	    /* "..." argument a:1, a:2, etc. */
	    sprintf((char *)numbuf, "%d", ai + 1);
	    name = numbuf;
	}
	if (fixvar_idx < FIXVAR_CNT && STRLEN(name) <= VAR_SHORT_LEN)
	{
	    v = &fc->fixvar[fixvar_idx++].var;
	    v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
	}
	else
	{
	    v = (dictitem_T *)alloc((unsigned)(sizeof(dictitem_T)
							     + STRLEN(name)));
	    if (v == NULL)
		break;
	    v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX | DI_FLAGS_ALLOC;
	}
	STRCPY(v->di_key, name);
	hash_add(&fc->l_avars.dv_hashtab, DI2HIKEY(v));

	/* Note: the values are copied directly to avoid alloc/free.
	 * "argvars" must have VAR_FIXED for v_lock. */
	v->di_tv = argvars[i];
	v->di_tv.v_lock = VAR_FIXED;

	if (ai >= 0 && ai < MAX_FUNC_ARGS)
	{
	    list_append(&fc->l_varlist, &fc->l_listitems[ai]);
	    fc->l_listitems[ai].li_tv = argvars[i];
	    fc->l_listitems[ai].li_tv.v_lock = VAR_FIXED;
	}
    }

    /* Don't redraw while executing the function. */
    ++RedrawingDisabled;
    save_sourcing_name = sourcing_name;
    save_sourcing_lnum = sourcing_lnum;
    sourcing_lnum = 1;
    /* need space for function name + ("function " + 3) or "[number]" */
    len = (save_sourcing_name == NULL ? 0 : STRLEN(save_sourcing_name))
						   + STRLEN(fp->uf_name) + 20;
    sourcing_name = alloc((unsigned)len);
    if (sourcing_name != NULL)
    {
	if (save_sourcing_name != NULL
			  && STRNCMP(save_sourcing_name, "function ", 9) == 0)
	    sprintf((char *)sourcing_name, "%s[%d]..",
				 save_sourcing_name, (int)save_sourcing_lnum);
	else
	    STRCPY(sourcing_name, "function ");
	cat_func_name(sourcing_name + STRLEN(sourcing_name), fp);

	if (p_verbose >= 12)
	{
	    ++no_wait_return;
	    verbose_enter_scroll();

	    smsg((char_u *)_("calling %s"), sourcing_name);
	    if (p_verbose >= 14)
	    {
		char_u	buf[MSG_BUF_LEN];
		char_u	numbuf2[NUMBUFLEN];
		char_u	*tofree;
		char_u	*s;

		msg_puts((char_u *)"(");
		for (i = 0; i < argcount; ++i)
		{
		    if (i > 0)
			msg_puts((char_u *)", ");
		    if (argvars[i].v_type == VAR_NUMBER)
			msg_outnum((long)argvars[i].vval.v_number);
		    else
		    {
			/* Do not want errors such as E724 here. */
			++emsg_off;
			s = tv2string(&argvars[i], &tofree, numbuf2, 0);
			--emsg_off;
			if (s != NULL)
			{
			    if (vim_strsize(s) > MSG_BUF_CLEN)
			    {
				trunc_string(s, buf, MSG_BUF_CLEN, MSG_BUF_LEN);
				s = buf;
			    }
			    msg_puts(s);
			    vim_free(tofree);
			}
		    }
		}
		msg_puts((char_u *)")");
	    }
	    msg_puts((char_u *)"\n");   /* don't overwrite this either */

	    verbose_leave_scroll();
	    --no_wait_return;
	}
    }
#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
    {
	if (!fp->uf_profiling && has_profiling(FALSE, fp->uf_name, NULL))
	    func_do_profile(fp);
	if (fp->uf_profiling
		    || (fc->caller != NULL && fc->caller->func->uf_profiling))
	{
	    ++fp->uf_tm_count;
	    profile_start(&call_start);
	    profile_zero(&fp->uf_tm_children);
	}
	script_prof_save(&wait_start);
    }
#endif

    save_current_SID = current_SID;
    current_SID = fp->uf_script_ID;
    save_did_emsg = did_emsg;
    did_emsg = FALSE;

    /* call do_cmdline() to execute the lines */
    do_cmdline(NULL, get_func_line, (void *)fc,
				     DOCMD_NOWAIT|DOCMD_VERBOSE|DOCMD_REPEAT);

    --RedrawingDisabled;

    /* when the function was aborted because of an error, return -1 */
    if ((did_emsg && (fp->uf_flags & FC_ABORT)) || rettv->v_type == VAR_UNKNOWN)
    {
	clear_tv(rettv);
	rettv->v_type = VAR_NUMBER;
	rettv->vval.v_number = -1;
    }

#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES && (fp->uf_profiling
		    || (fc->caller != NULL && fc->caller->func->uf_profiling)))
    {
	profile_end(&call_start);
	profile_sub_wait(&wait_start, &call_start);
	profile_add(&fp->uf_tm_total, &call_start);
	profile_self(&fp->uf_tm_self, &call_start, &fp->uf_tm_children);
	if (fc->caller != NULL && fc->caller->func->uf_profiling)
	{
	    profile_add(&fc->caller->func->uf_tm_children, &call_start);
	    profile_add(&fc->caller->func->uf_tml_children, &call_start);
	}
    }
#endif

    /* when being verbose, mention the return value */
    if (p_verbose >= 12)
    {
	++no_wait_return;
	verbose_enter_scroll();

	if (aborting())
	    smsg((char_u *)_("%s aborted"), sourcing_name);
	else if (fc->rettv->v_type == VAR_NUMBER)
	    smsg((char_u *)_("%s returning #%ld"), sourcing_name,
					       (long)fc->rettv->vval.v_number);
	else
	{
	    char_u	buf[MSG_BUF_LEN];
	    char_u	numbuf2[NUMBUFLEN];
	    char_u	*tofree;
	    char_u	*s;

	    /* The value may be very long.  Skip the middle part, so that we
	     * have some idea how it starts and ends. smsg() would always
	     * truncate it at the end. Don't want errors such as E724 here. */
	    ++emsg_off;
	    s = tv2string(fc->rettv, &tofree, numbuf2, 0);
	    --emsg_off;
	    if (s != NULL)
	    {
		if (vim_strsize(s) > MSG_BUF_CLEN)
		{
		    trunc_string(s, buf, MSG_BUF_CLEN, MSG_BUF_LEN);
		    s = buf;
		}
		smsg((char_u *)_("%s returning %s"), sourcing_name, s);
		vim_free(tofree);
	    }
	}
	msg_puts((char_u *)"\n");   /* don't overwrite this either */

	verbose_leave_scroll();
	--no_wait_return;
    }

    vim_free(sourcing_name);
    sourcing_name = save_sourcing_name;
    sourcing_lnum = save_sourcing_lnum;
    current_SID = save_current_SID;
#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
	script_prof_restore(&wait_start);
#endif

    if (p_verbose >= 12 && sourcing_name != NULL)
    {
	++no_wait_return;
	verbose_enter_scroll();

	smsg((char_u *)_("continuing in %s"), sourcing_name);
	msg_puts((char_u *)"\n");   /* don't overwrite this either */

	verbose_leave_scroll();
	--no_wait_return;
    }

    did_emsg |= save_did_emsg;
    current_funccal = fc->caller;
    --depth;

    /* If the a:000 list and the l: and a: dicts are not referenced we can
     * free the funccall_T and what's in it. */
    if (fc->l_varlist.lv_refcount == DO_NOT_FREE_CNT
	    && fc->l_vars.dv_refcount == DO_NOT_FREE_CNT
	    && fc->l_avars.dv_refcount == DO_NOT_FREE_CNT)
    {
	free_funccal(fc, FALSE);
    }
    else
    {
	hashitem_T	*hi;
	listitem_T	*li;
	int		todo;

	/* "fc" is still in use.  This can happen when returning "a:000" or
	 * assigning "l:" to a global variable.
	 * Link "fc" in the list for garbage collection later. */
	fc->caller = previous_funccal;
	previous_funccal = fc;

	/* Make a copy of the a: variables, since we didn't do that above. */
	todo = (int)fc->l_avars.dv_hashtab.ht_used;
	for (hi = fc->l_avars.dv_hashtab.ht_array; todo > 0; ++hi)
	{
	    if (!HASHITEM_EMPTY(hi))
	    {
		--todo;
		v = HI2DI(hi);
		copy_tv(&v->di_tv, &v->di_tv);
	    }
	}

	/* Make a copy of the a:000 items, since we didn't do that above. */
	for (li = fc->l_varlist.lv_first; li != NULL; li = li->li_next)
	    copy_tv(&li->li_tv, &li->li_tv);
    }
}

/*
 * Return TRUE if items in "fc" do not have "copyID".  That means they are not
 * referenced from anywhere that is in use.
 */
    static int
can_free_funccal(funccall_T *fc, int copyID)
{
    return (fc->l_varlist.lv_copyID != copyID
	    && fc->l_vars.dv_copyID != copyID
	    && fc->l_avars.dv_copyID != copyID);
}

/*
 * Free "fc" and what it contains.
 */
   static void
free_funccal(
    funccall_T	*fc,
    int		free_val)  /* a: vars were allocated */
{
    listitem_T	*li;

    /* The a: variables typevals may not have been allocated, only free the
     * allocated variables. */
    vars_clear_ext(&fc->l_avars.dv_hashtab, free_val);

    /* free all l: variables */
    vars_clear(&fc->l_vars.dv_hashtab);

    /* Free the a:000 variables if they were allocated. */
    if (free_val)
	for (li = fc->l_varlist.lv_first; li != NULL; li = li->li_next)
	    clear_tv(&li->li_tv);

    vim_free(fc);
}

/*
 * Add a number variable "name" to dict "dp" with value "nr".
 */
    static void
add_nr_var(
    dict_T	*dp,
    dictitem_T	*v,
    char	*name,
    varnumber_T nr)
{
    STRCPY(v->di_key, name);
    v->di_flags = DI_FLAGS_RO | DI_FLAGS_FIX;
    hash_add(&dp->dv_hashtab, DI2HIKEY(v));
    v->di_tv.v_type = VAR_NUMBER;
    v->di_tv.v_lock = VAR_FIXED;
    v->di_tv.vval.v_number = nr;
}

/*
 * ":return [expr]"
 */
    void
ex_return(exarg_T *eap)
{
    char_u	*arg = eap->arg;
    typval_T	rettv;
    int		returning = FALSE;

    if (current_funccal == NULL)
    {
	EMSG(_("E133: :return not inside a function"));
	return;
    }

    if (eap->skip)
	++emsg_skip;

    eap->nextcmd = NULL;
    if ((*arg != NUL && *arg != '|' && *arg != '\n')
	    && eval0(arg, &rettv, &eap->nextcmd, !eap->skip) != FAIL)
    {
	if (!eap->skip)
	    returning = do_return(eap, FALSE, TRUE, &rettv);
	else
	    clear_tv(&rettv);
    }
    /* It's safer to return also on error. */
    else if (!eap->skip)
    {
	/*
	 * Return unless the expression evaluation has been cancelled due to an
	 * aborting error, an interrupt, or an exception.
	 */
	if (!aborting())
	    returning = do_return(eap, FALSE, TRUE, NULL);
    }

    /* When skipping or the return gets pending, advance to the next command
     * in this line (!returning).  Otherwise, ignore the rest of the line.
     * Following lines will be ignored by get_func_line(). */
    if (returning)
	eap->nextcmd = NULL;
    else if (eap->nextcmd == NULL)	    /* no argument */
	eap->nextcmd = check_nextcmd(arg);

    if (eap->skip)
	--emsg_skip;
}

/*
 * Return from a function.  Possibly makes the return pending.  Also called
 * for a pending return at the ":endtry" or after returning from an extra
 * do_cmdline().  "reanimate" is used in the latter case.  "is_cmd" is set
 * when called due to a ":return" command.  "rettv" may point to a typval_T
 * with the return rettv.  Returns TRUE when the return can be carried out,
 * FALSE when the return gets pending.
 */
    int
do_return(
    exarg_T	*eap,
    int		reanimate,
    int		is_cmd,
    void	*rettv)
{
    int		idx;
    struct condstack *cstack = eap->cstack;

    if (reanimate)
	/* Undo the return. */
	current_funccal->returned = FALSE;

    /*
     * Cleanup (and inactivate) conditionals, but stop when a try conditional
     * not in its finally clause (which then is to be executed next) is found.
     * In this case, make the ":return" pending for execution at the ":endtry".
     * Otherwise, return normally.
     */
    idx = cleanup_conditionals(eap->cstack, 0, TRUE);
    if (idx >= 0)
    {
	cstack->cs_pending[idx] = CSTP_RETURN;

	if (!is_cmd && !reanimate)
	    /* A pending return again gets pending.  "rettv" points to an
	     * allocated variable with the rettv of the original ":return"'s
	     * argument if present or is NULL else. */
	    cstack->cs_rettv[idx] = rettv;
	else
	{
	    /* When undoing a return in order to make it pending, get the stored
	     * return rettv. */
	    if (reanimate)
		rettv = current_funccal->rettv;

	    if (rettv != NULL)
	    {
		/* Store the value of the pending return. */
		if ((cstack->cs_rettv[idx] = alloc_tv()) != NULL)
		    *(typval_T *)cstack->cs_rettv[idx] = *(typval_T *)rettv;
		else
		    EMSG(_(e_outofmem));
	    }
	    else
		cstack->cs_rettv[idx] = NULL;

	    if (reanimate)
	    {
		/* The pending return value could be overwritten by a ":return"
		 * without argument in a finally clause; reset the default
		 * return value. */
		current_funccal->rettv->v_type = VAR_NUMBER;
		current_funccal->rettv->vval.v_number = 0;
	    }
	}
	report_make_pending(CSTP_RETURN, rettv);
    }
    else
    {
	current_funccal->returned = TRUE;

	/* If the return is carried out now, store the return value.  For
	 * a return immediately after reanimation, the value is already
	 * there. */
	if (!reanimate && rettv != NULL)
	{
	    clear_tv(current_funccal->rettv);
	    *current_funccal->rettv = *(typval_T *)rettv;
	    if (!is_cmd)
		vim_free(rettv);
	}
    }

    return idx < 0;
}

/*
 * Free the variable with a pending return value.
 */
    void
discard_pending_return(void *rettv)
{
    free_tv((typval_T *)rettv);
}

/*
 * Generate a return command for producing the value of "rettv".  The result
 * is an allocated string.  Used by report_pending() for verbose messages.
 */
    char_u *
get_return_cmd(void *rettv)
{
    char_u	*s = NULL;
    char_u	*tofree = NULL;
    char_u	numbuf[NUMBUFLEN];

    if (rettv != NULL)
	s = echo_string((typval_T *)rettv, &tofree, numbuf, 0);
    if (s == NULL)
	s = (char_u *)"";

    STRCPY(IObuff, ":return ");
    STRNCPY(IObuff + 8, s, IOSIZE - 8);
    if (STRLEN(s) + 8 >= IOSIZE)
	STRCPY(IObuff + IOSIZE - 4, "...");
    vim_free(tofree);
    return vim_strsave(IObuff);
}

/*
 * Get next function line.
 * Called by do_cmdline() to get the next line.
 * Returns allocated string, or NULL for end of function.
 */
    char_u *
get_func_line(
    int	    c UNUSED,
    void    *cookie,
    int	    indent UNUSED)
{
    funccall_T	*fcp = (funccall_T *)cookie;
    ufunc_T	*fp = fcp->func;
    char_u	*retval;
    garray_T	*gap;  /* growarray with function lines */

    /* If breakpoints have been added/deleted need to check for it. */
    if (fcp->dbg_tick != debug_tick)
    {
	fcp->breakpoint = dbg_find_breakpoint(FALSE, fp->uf_name,
							       sourcing_lnum);
	fcp->dbg_tick = debug_tick;
    }
#ifdef FEAT_PROFILE
    if (do_profiling == PROF_YES)
	func_line_end(cookie);
#endif

    gap = &fp->uf_lines;
    if (((fp->uf_flags & FC_ABORT) && did_emsg && !aborted_in_try())
	    || fcp->returned)
	retval = NULL;
    else
    {
	/* Skip NULL lines (continuation lines). */
	while (fcp->linenr < gap->ga_len
			  && ((char_u **)(gap->ga_data))[fcp->linenr] == NULL)
	    ++fcp->linenr;
	if (fcp->linenr >= gap->ga_len)
	    retval = NULL;
	else
	{
	    retval = vim_strsave(((char_u **)(gap->ga_data))[fcp->linenr++]);
	    sourcing_lnum = fcp->linenr;
#ifdef FEAT_PROFILE
	    if (do_profiling == PROF_YES)
		func_line_start(cookie);
#endif
	}
    }

    /* Did we encounter a breakpoint? */
    if (fcp->breakpoint != 0 && fcp->breakpoint <= sourcing_lnum)
    {
	dbg_breakpoint(fp->uf_name, sourcing_lnum);
	/* Find next breakpoint. */
	fcp->breakpoint = dbg_find_breakpoint(FALSE, fp->uf_name,
							       sourcing_lnum);
	fcp->dbg_tick = debug_tick;
    }

    return retval;
}

#if defined(FEAT_PROFILE) || defined(PROTO)
/*
 * Called when starting to read a function line.
 * "sourcing_lnum" must be correct!
 * When skipping lines it may not actually be executed, but we won't find out
 * until later and we need to store the time now.
 */
    void
func_line_start(void *cookie)
{
    funccall_T	*fcp = (funccall_T *)cookie;
    ufunc_T	*fp = fcp->func;

    if (fp->uf_profiling && sourcing_lnum >= 1
				      && sourcing_lnum <= fp->uf_lines.ga_len)
    {
	fp->uf_tml_idx = sourcing_lnum - 1;
	/* Skip continuation lines. */
	while (fp->uf_tml_idx > 0 && FUNCLINE(fp, fp->uf_tml_idx) == NULL)
	    --fp->uf_tml_idx;
	fp->uf_tml_execed = FALSE;
	profile_start(&fp->uf_tml_start);
	profile_zero(&fp->uf_tml_children);
	profile_get_wait(&fp->uf_tml_wait);
    }
}

/*
 * Called when actually executing a function line.
 */
    void
func_line_exec(void *cookie)
{
    funccall_T	*fcp = (funccall_T *)cookie;
    ufunc_T	*fp = fcp->func;

    if (fp->uf_profiling && fp->uf_tml_idx >= 0)
	fp->uf_tml_execed = TRUE;
}

/*
 * Called when done with a function line.
 */
    void
func_line_end(void *cookie)
{
    funccall_T	*fcp = (funccall_T *)cookie;
    ufunc_T	*fp = fcp->func;

    if (fp->uf_profiling && fp->uf_tml_idx >= 0)
    {
	if (fp->uf_tml_execed)
	{
	    ++fp->uf_tml_count[fp->uf_tml_idx];
	    profile_end(&fp->uf_tml_start);
	    profile_sub_wait(&fp->uf_tml_wait, &fp->uf_tml_start);
	    profile_add(&fp->uf_tml_total[fp->uf_tml_idx], &fp->uf_tml_start);
	    profile_self(&fp->uf_tml_self[fp->uf_tml_idx], &fp->uf_tml_start,
							&fp->uf_tml_children);
	}
	fp->uf_tml_idx = -1;
    }
}
#endif

/*
 * Return TRUE if the currently active function should be ended, because a
 * return was encountered or an error occurred.  Used inside a ":while".
 */
    int
func_has_ended(void *cookie)
{
    funccall_T  *fcp = (funccall_T *)cookie;

    /* Ignore the "abort" flag if the abortion behavior has been changed due to
     * an error inside a try conditional. */
    return (((fcp->func->uf_flags & FC_ABORT) && did_emsg && !aborted_in_try())
	    || fcp->returned);
}

/*
 * return TRUE if cookie indicates a function which "abort"s on errors.
 */
    int
func_has_abort(
    void    *cookie)
{
    return ((funccall_T *)cookie)->func->uf_flags & FC_ABORT;
}

#if defined(FEAT_VIMINFO) || defined(FEAT_SESSION)
typedef enum
{
    VAR_FLAVOUR_DEFAULT,	/* doesn't start with uppercase */
    VAR_FLAVOUR_SESSION,	/* starts with uppercase, some lower */
    VAR_FLAVOUR_VIMINFO		/* all uppercase */
} var_flavour_T;

static var_flavour_T var_flavour(char_u *varname);

    static var_flavour_T
var_flavour(char_u *varname)
{
    char_u *p = varname;

    if (ASCII_ISUPPER(*p))
    {
	while (*(++p))
	    if (ASCII_ISLOWER(*p))
		return VAR_FLAVOUR_SESSION;
	return VAR_FLAVOUR_VIMINFO;
    }
    else
	return VAR_FLAVOUR_DEFAULT;
}
#endif

#if defined(FEAT_VIMINFO) || defined(PROTO)
/*
 * Restore global vars that start with a capital from the viminfo file
 */
    int
read_viminfo_varlist(vir_T *virp, int writing)
{
    char_u	*tab;
    int		type = VAR_NUMBER;
    typval_T	tv;
    funccall_T  *save_funccal;

    if (!writing && (find_viminfo_parameter('!') != NULL))
    {
	tab = vim_strchr(virp->vir_line + 1, '\t');
	if (tab != NULL)
	{
	    *tab++ = '\0';	/* isolate the variable name */
	    switch (*tab)
	    {
		case 'S': type = VAR_STRING; break;
#ifdef FEAT_FLOAT
		case 'F': type = VAR_FLOAT; break;
#endif
		case 'D': type = VAR_DICT; break;
		case 'L': type = VAR_LIST; break;
		case 'X': type = VAR_SPECIAL; break;
	    }

	    tab = vim_strchr(tab, '\t');
	    if (tab != NULL)
	    {
		tv.v_type = type;
		if (type == VAR_STRING || type == VAR_DICT || type == VAR_LIST)
		    tv.vval.v_string = viminfo_readstring(virp,
				       (int)(tab - virp->vir_line + 1), TRUE);
#ifdef FEAT_FLOAT
		else if (type == VAR_FLOAT)
		    (void)string2float(tab + 1, &tv.vval.v_float);
#endif
		else
		    tv.vval.v_number = atol((char *)tab + 1);
		if (type == VAR_DICT || type == VAR_LIST)
		{
		    typval_T *etv = eval_expr(tv.vval.v_string, NULL);

		    if (etv == NULL)
			/* Failed to parse back the dict or list, use it as a
			 * string. */
			tv.v_type = VAR_STRING;
		    else
		    {
			vim_free(tv.vval.v_string);
			tv = *etv;
			vim_free(etv);
		    }
		}

		/* when in a function use global variables */
		save_funccal = current_funccal;
		current_funccal = NULL;
		set_var(virp->vir_line + 1, &tv, FALSE);
		current_funccal = save_funccal;

		if (tv.v_type == VAR_STRING)
		    vim_free(tv.vval.v_string);
		else if (tv.v_type == VAR_DICT || tv.v_type == VAR_LIST)
		    clear_tv(&tv);
	    }
	}
    }

    return viminfo_readline(virp);
}

/*
 * Write global vars that start with a capital to the viminfo file
 */
    void
write_viminfo_varlist(FILE *fp)
{
    hashitem_T	*hi;
    dictitem_T	*this_var;
    int		todo;
    char	*s;
    char_u	*p;
    char_u	*tofree;
    char_u	numbuf[NUMBUFLEN];

    if (find_viminfo_parameter('!') == NULL)
	return;

    fputs(_("\n# global variables:\n"), fp);

    todo = (int)globvarht.ht_used;
    for (hi = globvarht.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    this_var = HI2DI(hi);
	    if (var_flavour(this_var->di_key) == VAR_FLAVOUR_VIMINFO)
	    {
		switch (this_var->di_tv.v_type)
		{
		    case VAR_STRING: s = "STR"; break;
		    case VAR_NUMBER: s = "NUM"; break;
#ifdef FEAT_FLOAT
		    case VAR_FLOAT:  s = "FLO"; break;
#endif
		    case VAR_DICT:   s = "DIC"; break;
		    case VAR_LIST:   s = "LIS"; break;
		    case VAR_SPECIAL: s = "XPL"; break;

		    case VAR_UNKNOWN:
		    case VAR_FUNC:
				     continue;
		}
		fprintf(fp, "!%s\t%s\t", this_var->di_key, s);
		p = echo_string(&this_var->di_tv, &tofree, numbuf, 0);
		if (p != NULL)
		    viminfo_writestring(fp, p);
		vim_free(tofree);
	    }
	}
    }
}
#endif

#if defined(FEAT_SESSION) || defined(PROTO)
    int
store_session_globals(FILE *fd)
{
    hashitem_T	*hi;
    dictitem_T	*this_var;
    int		todo;
    char_u	*p, *t;

    todo = (int)globvarht.ht_used;
    for (hi = globvarht.ht_array; todo > 0; ++hi)
    {
	if (!HASHITEM_EMPTY(hi))
	{
	    --todo;
	    this_var = HI2DI(hi);
	    if ((this_var->di_tv.v_type == VAR_NUMBER
			|| this_var->di_tv.v_type == VAR_STRING)
		    && var_flavour(this_var->di_key) == VAR_FLAVOUR_SESSION)
	    {
		/* Escape special characters with a backslash.  Turn a LF and
		 * CR into \n and \r. */
		p = vim_strsave_escaped(get_tv_string(&this_var->di_tv),
							(char_u *)"\\\"\n\r");
		if (p == NULL)	    /* out of memory */
		    break;
		for (t = p; *t != NUL; ++t)
		    if (*t == '\n')
			*t = 'n';
		    else if (*t == '\r')
			*t = 'r';
		if ((fprintf(fd, "let %s = %c%s%c",
				this_var->di_key,
				(this_var->di_tv.v_type == VAR_STRING) ? '"'
									: ' ',
				p,
				(this_var->di_tv.v_type == VAR_STRING) ? '"'
								   : ' ') < 0)
			|| put_eol(fd) == FAIL)
		{
		    vim_free(p);
		    return FAIL;
		}
		vim_free(p);
	    }
#ifdef FEAT_FLOAT
	    else if (this_var->di_tv.v_type == VAR_FLOAT
		    && var_flavour(this_var->di_key) == VAR_FLAVOUR_SESSION)
	    {
		float_T f = this_var->di_tv.vval.v_float;
		int sign = ' ';

		if (f < 0)
		{
		    f = -f;
		    sign = '-';
		}
		if ((fprintf(fd, "let %s = %c%f",
					       this_var->di_key, sign, f) < 0)
			|| put_eol(fd) == FAIL)
		    return FAIL;
	    }
#endif
	}
    }
    return OK;
}
#endif

/*
 * Display script name where an item was last set.
 * Should only be invoked when 'verbose' is non-zero.
 */
    void
last_set_msg(scid_T scriptID)
{
    char_u *p;

    if (scriptID != 0)
    {
	p = home_replace_save(NULL, get_scriptname(scriptID));
	if (p != NULL)
	{
	    verbose_enter();
	    MSG_PUTS(_("\n\tLast set from "));
	    MSG_PUTS(p);
	    vim_free(p);
	    verbose_leave();
	}
    }
}

/*
 * List v:oldfiles in a nice way.
 */
    void
ex_oldfiles(exarg_T *eap UNUSED)
{
    list_T	*l = vimvars[VV_OLDFILES].vv_list;
    listitem_T	*li;
    int		nr = 0;

    if (l == NULL)
	msg((char_u *)_("No old files"));
    else
    {
	msg_start();
	msg_scroll = TRUE;
	for (li = l->lv_first; li != NULL && !got_int; li = li->li_next)
	{
	    msg_outnum((long)++nr);
	    MSG_PUTS(": ");
	    msg_outtrans(get_tv_string(&li->li_tv));
	    msg_putchar('\n');
	    out_flush();	    /* output one line at a time */
	    ui_breakcheck();
	}
	/* Assume "got_int" was set to truncate the listing. */
	got_int = FALSE;

#ifdef FEAT_BROWSE_CMD
	if (cmdmod.browse)
	{
	    quit_more = FALSE;
	    nr = prompt_for_number(FALSE);
	    msg_starthere();
	    if (nr > 0)
	    {
		char_u *p = list_find_str(get_vim_var_list(VV_OLDFILES),
								    (long)nr);

		if (p != NULL)
		{
		    p = expand_env_save(p);
		    eap->arg = p;
		    eap->cmdidx = CMD_edit;
		    cmdmod.browse = FALSE;
		    do_exedit(eap, NULL);
		    vim_free(p);
		}
	    }
	}
#endif
    }
}

/* reset v:option_new, v:option_old and v:option_type */
    void
reset_v_option_vars(void)
{
    set_vim_var_string(VV_OPTION_NEW,  NULL, -1);
    set_vim_var_string(VV_OPTION_OLD,  NULL, -1);
    set_vim_var_string(VV_OPTION_TYPE, NULL, -1);
}


#endif /* FEAT_EVAL */


#if defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) || defined(PROTO)

#ifdef WIN3264
/*
 * Functions for ":8" filename modifier: get 8.3 version of a filename.
 */
static int get_short_pathname(char_u **fnamep, char_u **bufp, int *fnamelen);
static int shortpath_for_invalid_fname(char_u **fname, char_u **bufp, int *fnamelen);
static int shortpath_for_partial(char_u **fnamep, char_u **bufp, int *fnamelen);

/*
 * Get the short path (8.3) for the filename in "fnamep".
 * Only works for a valid file name.
 * When the path gets longer "fnamep" is changed and the allocated buffer
 * is put in "bufp".
 * *fnamelen is the length of "fnamep" and set to 0 for a nonexistent path.
 * Returns OK on success, FAIL on failure.
 */
    static int
get_short_pathname(char_u **fnamep, char_u **bufp, int *fnamelen)
{
    int		l, len;
    char_u	*newbuf;

    len = *fnamelen;
    l = GetShortPathName(*fnamep, *fnamep, len);
    if (l > len - 1)
    {
	/* If that doesn't work (not enough space), then save the string
	 * and try again with a new buffer big enough. */
	newbuf = vim_strnsave(*fnamep, l);
	if (newbuf == NULL)
	    return FAIL;

	vim_free(*bufp);
	*fnamep = *bufp = newbuf;

	/* Really should always succeed, as the buffer is big enough. */
	l = GetShortPathName(*fnamep, *fnamep, l+1);
    }

    *fnamelen = l;
    return OK;
}

/*
 * Get the short path (8.3) for the filename in "fname". The converted
 * path is returned in "bufp".
 *
 * Some of the directories specified in "fname" may not exist. This function
 * will shorten the existing directories at the beginning of the path and then
 * append the remaining non-existing path.
 *
 * fname - Pointer to the filename to shorten.  On return, contains the
 *	   pointer to the shortened pathname
 * bufp -  Pointer to an allocated buffer for the filename.
 * fnamelen - Length of the filename pointed to by fname
 *
 * Returns OK on success (or nothing done) and FAIL on failure (out of memory).
 */
    static int
shortpath_for_invalid_fname(
    char_u	**fname,
    char_u	**bufp,
    int		*fnamelen)
{
    char_u	*short_fname, *save_fname, *pbuf_unused;
    char_u	*endp, *save_endp;
    char_u	ch;
    int		old_len, len;
    int		new_len, sfx_len;
    int		retval = OK;

    /* Make a copy */
    old_len = *fnamelen;
    save_fname = vim_strnsave(*fname, old_len);
    pbuf_unused = NULL;
    short_fname = NULL;

    endp = save_fname + old_len - 1; /* Find the end of the copy */
    save_endp = endp;

    /*
     * Try shortening the supplied path till it succeeds by removing one
     * directory at a time from the tail of the path.
     */
    len = 0;
    for (;;)
    {
	/* go back one path-separator */
	while (endp > save_fname && !after_pathsep(save_fname, endp + 1))
	    --endp;
	if (endp <= save_fname)
	    break;		/* processed the complete path */

	/*
	 * Replace the path separator with a NUL and try to shorten the
	 * resulting path.
	 */
	ch = *endp;
	*endp = 0;
	short_fname = save_fname;
	len = (int)STRLEN(short_fname) + 1;
	if (get_short_pathname(&short_fname, &pbuf_unused, &len) == FAIL)
	{
	    retval = FAIL;
	    goto theend;
	}
	*endp = ch;	/* preserve the string */

	if (len > 0)
	    break;	/* successfully shortened the path */

	/* failed to shorten the path. Skip the path separator */
	--endp;
    }

    if (len > 0)
    {
	/*
	 * Succeeded in shortening the path. Now concatenate the shortened
	 * path with the remaining path at the tail.
	 */

	/* Compute the length of the new path. */
	sfx_len = (int)(save_endp - endp) + 1;
	new_len = len + sfx_len;

	*fnamelen = new_len;
	vim_free(*bufp);
	if (new_len > old_len)
	{
	    /* There is not enough space in the currently allocated string,
	     * copy it to a buffer big enough. */
	    *fname = *bufp = vim_strnsave(short_fname, new_len);
	    if (*fname == NULL)
	    {
		retval = FAIL;
		goto theend;
	    }
	}
	else
	{
	    /* Transfer short_fname to the main buffer (it's big enough),
	     * unless get_short_pathname() did its work in-place. */
	    *fname = *bufp = save_fname;
	    if (short_fname != save_fname)
		vim_strncpy(save_fname, short_fname, len);
	    save_fname = NULL;
	}

	/* concat the not-shortened part of the path */
	vim_strncpy(*fname + len, endp, sfx_len);
	(*fname)[new_len] = NUL;
    }

theend:
    vim_free(pbuf_unused);
    vim_free(save_fname);

    return retval;
}

/*
 * Get a pathname for a partial path.
 * Returns OK for success, FAIL for failure.
 */
    static int
shortpath_for_partial(
    char_u	**fnamep,
    char_u	**bufp,
    int		*fnamelen)
{
    int		sepcount, len, tflen;
    char_u	*p;
    char_u	*pbuf, *tfname;
    int		hasTilde;

    /* Count up the path separators from the RHS.. so we know which part
     * of the path to return. */
    sepcount = 0;
    for (p = *fnamep; p < *fnamep + *fnamelen; mb_ptr_adv(p))
	if (vim_ispathsep(*p))
	    ++sepcount;

    /* Need full path first (use expand_env() to remove a "~/") */
    hasTilde = (**fnamep == '~');
    if (hasTilde)
	pbuf = tfname = expand_env_save(*fnamep);
    else
	pbuf = tfname = FullName_save(*fnamep, FALSE);

    len = tflen = (int)STRLEN(tfname);

    if (get_short_pathname(&tfname, &pbuf, &len) == FAIL)
	return FAIL;

    if (len == 0)
    {
	/* Don't have a valid filename, so shorten the rest of the
	 * path if we can. This CAN give us invalid 8.3 filenames, but
	 * there's not a lot of point in guessing what it might be.
	 */
	len = tflen;
	if (shortpath_for_invalid_fname(&tfname, &pbuf, &len) == FAIL)
	    return FAIL;
    }

    /* Count the paths backward to find the beginning of the desired string. */
    for (p = tfname + len - 1; p >= tfname; --p)
    {
#ifdef FEAT_MBYTE
	if (has_mbyte)
	    p -= mb_head_off(tfname, p);
#endif
	if (vim_ispathsep(*p))
	{
	    if (sepcount == 0 || (hasTilde && sepcount == 1))
		break;
	    else
		sepcount --;
	}
    }
    if (hasTilde)
    {
	--p;
	if (p >= tfname)
	    *p = '~';
	else
	    return FAIL;
    }
    else
	++p;

    /* Copy in the string - p indexes into tfname - allocated at pbuf */
    vim_free(*bufp);
    *fnamelen = (int)STRLEN(p);
    *bufp = pbuf;
    *fnamep = p;

    return OK;
}
#endif /* WIN3264 */

/*
 * Adjust a filename, according to a string of modifiers.
 * *fnamep must be NUL terminated when called.  When returning, the length is
 * determined by *fnamelen.
 * Returns VALID_ flags or -1 for failure.
 * When there is an error, *fnamep is set to NULL.
 */
    int
modify_fname(
    char_u	*src,		/* string with modifiers */
    int		*usedlen,	/* characters after src that are used */
    char_u	**fnamep,	/* file name so far */
    char_u	**bufp,		/* buffer for allocated file name or NULL */
    int		*fnamelen)	/* length of fnamep */
{
    int		valid = 0;
    char_u	*tail;
    char_u	*s, *p, *pbuf;
    char_u	dirname[MAXPATHL];
    int		c;
    int		has_fullname = 0;
#ifdef WIN3264
    char_u	*fname_start = *fnamep;
    int		has_shortname = 0;
#endif

repeat:
    /* ":p" - full path/file_name */
    if (src[*usedlen] == ':' && src[*usedlen + 1] == 'p')
    {
	has_fullname = 1;

	valid |= VALID_PATH;
	*usedlen += 2;

	/* Expand "~/path" for all systems and "~user/path" for Unix and VMS */
	if ((*fnamep)[0] == '~'
#if !defined(UNIX) && !(defined(VMS) && defined(USER_HOME))
		&& ((*fnamep)[1] == '/'
# ifdef BACKSLASH_IN_FILENAME
		    || (*fnamep)[1] == '\\'
# endif
		    || (*fnamep)[1] == NUL)

#endif
	   )
	{
	    *fnamep = expand_env_save(*fnamep);
	    vim_free(*bufp);	/* free any allocated file name */
	    *bufp = *fnamep;
	    if (*fnamep == NULL)
		return -1;
	}

	/* When "/." or "/.." is used: force expansion to get rid of it. */
	for (p = *fnamep; *p != NUL; mb_ptr_adv(p))
	{
	    if (vim_ispathsep(*p)
		    && p[1] == '.'
		    && (p[2] == NUL
			|| vim_ispathsep(p[2])
			|| (p[2] == '.'
			    && (p[3] == NUL || vim_ispathsep(p[3])))))
		break;
	}

	/* FullName_save() is slow, don't use it when not needed. */
	if (*p != NUL || !vim_isAbsName(*fnamep))
	{
	    *fnamep = FullName_save(*fnamep, *p != NUL);
	    vim_free(*bufp);	/* free any allocated file name */
	    *bufp = *fnamep;
	    if (*fnamep == NULL)
		return -1;
	}

#ifdef WIN3264
# if _WIN32_WINNT >= 0x0500
	if (vim_strchr(*fnamep, '~') != NULL)
	{
	    /* Expand 8.3 filename to full path.  Needed to make sure the same
	     * file does not have two different names.
	     * Note: problem does not occur if _WIN32_WINNT < 0x0500. */
	    p = alloc(_MAX_PATH + 1);
	    if (p != NULL)
	    {
		if (GetLongPathName(*fnamep, p, _MAX_PATH))
		{
		    vim_free(*bufp);
		    *bufp = *fnamep = p;
		}
		else
		    vim_free(p);
	    }
	}
# endif
#endif
	/* Append a path separator to a directory. */
	if (mch_isdir(*fnamep))
	{
	    /* Make room for one or two extra characters. */
	    *fnamep = vim_strnsave(*fnamep, (int)STRLEN(*fnamep) + 2);
	    vim_free(*bufp);	/* free any allocated file name */
	    *bufp = *fnamep;
	    if (*fnamep == NULL)
		return -1;
	    add_pathsep(*fnamep);
	}
    }

    /* ":." - path relative to the current directory */
    /* ":~" - path relative to the home directory */
    /* ":8" - shortname path - postponed till after */
    while (src[*usedlen] == ':'
		  && ((c = src[*usedlen + 1]) == '.' || c == '~' || c == '8'))
    {
	*usedlen += 2;
	if (c == '8')
	{
#ifdef WIN3264
	    has_shortname = 1; /* Postpone this. */
#endif
	    continue;
	}
	pbuf = NULL;
	/* Need full path first (use expand_env() to remove a "~/") */
	if (!has_fullname)
	{
	    if (c == '.' && **fnamep == '~')
		p = pbuf = expand_env_save(*fnamep);
	    else
		p = pbuf = FullName_save(*fnamep, FALSE);
	}
	else
	    p = *fnamep;

	has_fullname = 0;

	if (p != NULL)
	{
	    if (c == '.')
	    {
		mch_dirname(dirname, MAXPATHL);
		s = shorten_fname(p, dirname);
		if (s != NULL)
		{
		    *fnamep = s;
		    if (pbuf != NULL)
		    {
			vim_free(*bufp);   /* free any allocated file name */
			*bufp = pbuf;
			pbuf = NULL;
		    }
		}
	    }
	    else
	    {
		home_replace(NULL, p, dirname, MAXPATHL, TRUE);
		/* Only replace it when it starts with '~' */
		if (*dirname == '~')
		{
		    s = vim_strsave(dirname);
		    if (s != NULL)
		    {
			*fnamep = s;
			vim_free(*bufp);
			*bufp = s;
		    }
		}
	    }
	    vim_free(pbuf);
	}
    }

    tail = gettail(*fnamep);
    *fnamelen = (int)STRLEN(*fnamep);

    /* ":h" - head, remove "/file_name", can be repeated  */
    /* Don't remove the first "/" or "c:\" */
    while (src[*usedlen] == ':' && src[*usedlen + 1] == 'h')
    {
	valid |= VALID_HEAD;
	*usedlen += 2;
	s = get_past_head(*fnamep);
	while (tail > s && after_pathsep(s, tail))
	    mb_ptr_back(*fnamep, tail);
	*fnamelen = (int)(tail - *fnamep);
#ifdef VMS
	if (*fnamelen > 0)
	    *fnamelen += 1; /* the path separator is part of the path */
#endif
	if (*fnamelen == 0)
	{
	    /* Result is empty.  Turn it into "." to make ":cd %:h" work. */
	    p = vim_strsave((char_u *)".");
	    if (p == NULL)
		return -1;
	    vim_free(*bufp);
	    *bufp = *fnamep = tail = p;
	    *fnamelen = 1;
	}
	else
	{
	    while (tail > s && !after_pathsep(s, tail))
		mb_ptr_back(*fnamep, tail);
	}
    }

    /* ":8" - shortname  */
    if (src[*usedlen] == ':' && src[*usedlen + 1] == '8')
    {
	*usedlen += 2;
#ifdef WIN3264
	has_shortname = 1;
#endif
    }

#ifdef WIN3264
    /*
     * Handle ":8" after we have done 'heads' and before we do 'tails'.
     */
    if (has_shortname)
    {
	/* Copy the string if it is shortened by :h and when it wasn't copied
	 * yet, because we are going to change it in place.  Avoids changing
	 * the buffer name for "%:8". */
	if (*fnamelen < (int)STRLEN(*fnamep) || *fnamep == fname_start)
	{
	    p = vim_strnsave(*fnamep, *fnamelen);
	    if (p == NULL)
		return -1;
	    vim_free(*bufp);
	    *bufp = *fnamep = p;
	}

	/* Split into two implementations - makes it easier.  First is where
	 * there isn't a full name already, second is where there is. */
	if (!has_fullname && !vim_isAbsName(*fnamep))
	{
	    if (shortpath_for_partial(fnamep, bufp, fnamelen) == FAIL)
		return -1;
	}
	else
	{
	    int		l = *fnamelen;

	    /* Simple case, already have the full-name.
	     * Nearly always shorter, so try first time. */
	    if (get_short_pathname(fnamep, bufp, &l) == FAIL)
		return -1;

	    if (l == 0)
	    {
		/* Couldn't find the filename, search the paths. */
		l = *fnamelen;
		if (shortpath_for_invalid_fname(fnamep, bufp, &l) == FAIL)
		    return -1;
	    }
	    *fnamelen = l;
	}
    }
#endif /* WIN3264 */

    /* ":t" - tail, just the basename */
    if (src[*usedlen] == ':' && src[*usedlen + 1] == 't')
    {
	*usedlen += 2;
	*fnamelen -= (int)(tail - *fnamep);
	*fnamep = tail;
    }

    /* ":e" - extension, can be repeated */
    /* ":r" - root, without extension, can be repeated */
    while (src[*usedlen] == ':'
	    && (src[*usedlen + 1] == 'e' || src[*usedlen + 1] == 'r'))
    {
	/* find a '.' in the tail:
	 * - for second :e: before the current fname
	 * - otherwise: The last '.'
	 */
	if (src[*usedlen + 1] == 'e' && *fnamep > tail)
	    s = *fnamep - 2;
	else
	    s = *fnamep + *fnamelen - 1;
	for ( ; s > tail; --s)
	    if (s[0] == '.')
		break;
	if (src[*usedlen + 1] == 'e')		/* :e */
	{
	    if (s > tail)
	    {
		*fnamelen += (int)(*fnamep - (s + 1));
		*fnamep = s + 1;
#ifdef VMS
		/* cut version from the extension */
		s = *fnamep + *fnamelen - 1;
		for ( ; s > *fnamep; --s)
		    if (s[0] == ';')
			break;
		if (s > *fnamep)
		    *fnamelen = s - *fnamep;
#endif
	    }
	    else if (*fnamep <= tail)
		*fnamelen = 0;
	}
	else				/* :r */
	{
	    if (s > tail)	/* remove one extension */
		*fnamelen = (int)(s - *fnamep);
	}
	*usedlen += 2;
    }

    /* ":s?pat?foo?" - substitute */
    /* ":gs?pat?foo?" - global substitute */
    if (src[*usedlen] == ':'
	    && (src[*usedlen + 1] == 's'
		|| (src[*usedlen + 1] == 'g' && src[*usedlen + 2] == 's')))
    {
	char_u	    *str;
	char_u	    *pat;
	char_u	    *sub;
	int	    sep;
	char_u	    *flags;
	int	    didit = FALSE;

	flags = (char_u *)"";
	s = src + *usedlen + 2;
	if (src[*usedlen + 1] == 'g')
	{
	    flags = (char_u *)"g";
	    ++s;
	}

	sep = *s++;
	if (sep)
	{
	    /* find end of pattern */
	    p = vim_strchr(s, sep);
	    if (p != NULL)
	    {
		pat = vim_strnsave(s, (int)(p - s));
		if (pat != NULL)
		{
		    s = p + 1;
		    /* find end of substitution */
		    p = vim_strchr(s, sep);
		    if (p != NULL)
		    {
			sub = vim_strnsave(s, (int)(p - s));
			str = vim_strnsave(*fnamep, *fnamelen);
			if (sub != NULL && str != NULL)
			{
			    *usedlen = (int)(p + 1 - src);
			    s = do_string_sub(str, pat, sub, flags);
			    if (s != NULL)
			    {
				*fnamep = s;
				*fnamelen = (int)STRLEN(s);
				vim_free(*bufp);
				*bufp = s;
				didit = TRUE;
			    }
			}
			vim_free(sub);
			vim_free(str);
		    }
		    vim_free(pat);
		}
	    }
	    /* after using ":s", repeat all the modifiers */
	    if (didit)
		goto repeat;
	}
    }

    if (src[*usedlen] == ':' && src[*usedlen + 1] == 'S')
    {
	p = vim_strsave_shellescape(*fnamep, FALSE, FALSE);
	if (p == NULL)
	    return -1;
	vim_free(*bufp);
	*bufp = *fnamep = p;
	*fnamelen = (int)STRLEN(p);
	*usedlen += 2;
    }

    return valid;
}

/*
 * Perform a substitution on "str" with pattern "pat" and substitute "sub".
 * "flags" can be "g" to do a global substitute.
 * Returns an allocated string, NULL for error.
 */
    char_u *
do_string_sub(
    char_u	*str,
    char_u	*pat,
    char_u	*sub,
    char_u	*flags)
{
    int		sublen;
    regmatch_T	regmatch;
    int		i;
    int		do_all;
    char_u	*tail;
    char_u	*end;
    garray_T	ga;
    char_u	*ret;
    char_u	*save_cpo;
    char_u	*zero_width = NULL;

    /* Make 'cpoptions' empty, so that the 'l' flag doesn't work here */
    save_cpo = p_cpo;
    p_cpo = empty_option;

    ga_init2(&ga, 1, 200);

    do_all = (flags[0] == 'g');

    regmatch.rm_ic = p_ic;
    regmatch.regprog = vim_regcomp(pat, RE_MAGIC + RE_STRING);
    if (regmatch.regprog != NULL)
    {
	tail = str;
	end = str + STRLEN(str);
	while (vim_regexec_nl(&regmatch, str, (colnr_T)(tail - str)))
	{
	    /* Skip empty match except for first match. */
	    if (regmatch.startp[0] == regmatch.endp[0])
	    {
		if (zero_width == regmatch.startp[0])
		{
		    /* avoid getting stuck on a match with an empty string */
		    i = MB_PTR2LEN(tail);
		    mch_memmove((char_u *)ga.ga_data + ga.ga_len, tail,
								   (size_t)i);
		    ga.ga_len += i;
		    tail += i;
		    continue;
		}
		zero_width = regmatch.startp[0];
	    }

	    /*
	     * Get some space for a temporary buffer to do the substitution
	     * into.  It will contain:
	     * - The text up to where the match is.
	     * - The substituted text.
	     * - The text after the match.
	     */
	    sublen = vim_regsub(&regmatch, sub, tail, FALSE, TRUE, FALSE);
	    if (ga_grow(&ga, (int)((end - tail) + sublen -
			    (regmatch.endp[0] - regmatch.startp[0]))) == FAIL)
	    {
		ga_clear(&ga);
		break;
	    }

	    /* copy the text up to where the match is */
	    i = (int)(regmatch.startp[0] - tail);
	    mch_memmove((char_u *)ga.ga_data + ga.ga_len, tail, (size_t)i);
	    /* add the substituted text */
	    (void)vim_regsub(&regmatch, sub, (char_u *)ga.ga_data
					  + ga.ga_len + i, TRUE, TRUE, FALSE);
	    ga.ga_len += i + sublen - 1;
	    tail = regmatch.endp[0];
	    if (*tail == NUL)
		break;
	    if (!do_all)
		break;
	}

	if (ga.ga_data != NULL)
	    STRCPY((char *)ga.ga_data + ga.ga_len, tail);

	vim_regfree(regmatch.regprog);
    }

    ret = vim_strsave(ga.ga_data == NULL ? str : (char_u *)ga.ga_data);
    ga_clear(&ga);
    if (p_cpo == empty_option)
	p_cpo = save_cpo;
    else
	/* Darn, evaluating {sub} expression changed the value. */
	free_string_option(save_cpo);

    return ret;
}

#endif /* defined(FEAT_MODIFY_FNAME) || defined(FEAT_EVAL) */