src/structs.h

/* 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.
 */

/*
 * This file contains various definitions of structures that are used by Vim
 */

/*
 * There is something wrong in the SAS compiler that makes typedefs not
 * valid in include files.  Has been fixed in version 6.58.
 */
#if defined(SASC) && SASC < 658
typedef long		linenr_T;
typedef int		colnr_T;
typedef unsigned short	short_u;
#endif

/*
 * position in file or buffer
 */
typedef struct
{
    linenr_T	lnum;	/* line number */
    colnr_T	col;	/* column number */
#ifdef FEAT_VIRTUALEDIT
    colnr_T	coladd;
#endif
} pos_T;

#ifdef FEAT_VIRTUALEDIT
# define INIT_POS_T(l, c, ca) {l, c, ca}
#else
# define INIT_POS_T(l, c, ca) {l, c}
#endif

/*
 * Same, but without coladd.
 */
typedef struct
{
    linenr_T	lnum;	/* line number */
    colnr_T	col;	/* column number */
} lpos_T;

/*
 * Structure used for growing arrays.
 * This is used to store information that only grows, is deleted all at
 * once, and needs to be accessed by index.  See ga_clear() and ga_grow().
 */
typedef struct growarray
{
    int	    ga_len;		    /* current number of items used */
    int	    ga_maxlen;		    /* maximum number of items possible */
    int	    ga_itemsize;	    /* sizeof(item) */
    int	    ga_growsize;	    /* number of items to grow each time */
    void    *ga_data;		    /* pointer to the first item */
} garray_T;

#define GA_EMPTY    {0, 0, 0, 0, NULL}

typedef struct window_S		win_T;
typedef struct wininfo_S	wininfo_T;
typedef struct frame_S		frame_T;
typedef int			scid_T;		/* script ID */
typedef struct file_buffer	buf_T;  /* forward declaration */

/*
 * This is here because regexp.h needs pos_T and below regprog_T is used.
 */
#include "regexp.h"

/*
 * This is here because gui.h needs the pos_T and win_T, and win_T needs gui.h
 * for scrollbar_T.
 */
#ifdef FEAT_GUI
# include "gui.h"
#else
# ifdef FEAT_XCLIPBOARD
#  include <X11/Intrinsic.h>
# endif
# define guicolor_T int		/* avoid error in prototypes */
#endif

/*
 * marks: positions in a file
 * (a normal mark is a lnum/col pair, the same as a file position)
 */

/* (Note: for EBCDIC there are more than 26, because there are gaps in the
 * alphabet coding.  To minimize changes to the code, I decided to just
 * increase the number of possible marks. */
#define NMARKS		('z' - 'a' + 1)	/* max. # of named marks */
#define JUMPLISTSIZE	100		/* max. # of marks in jump list */
#define TAGSTACKSIZE	20		/* max. # of tags in tag stack */

typedef struct filemark
{
    pos_T	mark;		/* cursor position */
    int		fnum;		/* file number */
} fmark_T;

/* Xtended file mark: also has a file name */
typedef struct xfilemark
{
    fmark_T	fmark;
    char_u	*fname;		/* file name, used when fnum == 0 */
} xfmark_T;

/*
 * The taggy struct is used to store the information about a :tag command.
 */
typedef struct taggy
{
    char_u	*tagname;	/* tag name */
    fmark_T	fmark;		/* cursor position BEFORE ":tag" */
    int		cur_match;	/* match number */
    int		cur_fnum;	/* buffer number used for cur_match */
} taggy_T;

/*
 * Structure that contains all options that are local to a window.
 * Used twice in a window: for the current buffer and for all buffers.
 * Also used in wininfo_T.
 */
typedef struct
{
#ifdef FEAT_ARABIC
    int		wo_arab;
# define w_p_arab w_onebuf_opt.wo_arab	/* 'arabic' */
#endif
#ifdef FEAT_DIFF
    int		wo_diff;
# define w_p_diff w_onebuf_opt.wo_diff	/* 'diff' */
#endif
#ifdef FEAT_FOLDING
    long	wo_fdc;
# define w_p_fdc w_onebuf_opt.wo_fdc	/* 'foldcolumn' */
    int		wo_fen;
# define w_p_fen w_onebuf_opt.wo_fen	/* 'foldenable' */
    char_u	*wo_fdi;
# define w_p_fdi w_onebuf_opt.wo_fdi	/* 'foldignore' */
    long	wo_fdl;
# define w_p_fdl w_onebuf_opt.wo_fdl	/* 'foldlevel' */
    char_u	*wo_fdm;
# define w_p_fdm w_onebuf_opt.wo_fdm	/* 'foldmethod' */
    long	wo_fml;
# define w_p_fml w_onebuf_opt.wo_fml	/* 'foldminlines' */
    long	wo_fdn;
# define w_p_fdn w_onebuf_opt.wo_fdn	/* 'foldnestmax' */
# ifdef FEAT_EVAL
    char_u	*wo_fde;
# define w_p_fde w_onebuf_opt.wo_fde	/* 'foldexpr' */
    char_u	*wo_fdt;
#  define w_p_fdt w_onebuf_opt.wo_fdt	/* 'foldtext' */
# endif
    char_u	*wo_fmr;
# define w_p_fmr w_onebuf_opt.wo_fmr	/* 'foldmarker' */
#endif
#ifdef FEAT_LINEBREAK
    int		wo_lbr;
# define w_p_lbr w_onebuf_opt.wo_lbr	/* 'linebreak' */
#endif
    int		wo_list;
#define w_p_list w_onebuf_opt.wo_list	/* 'list' */
    int		wo_nu;
#define w_p_nu w_onebuf_opt.wo_nu	/* 'number' */
    int		wo_rnu;
#define w_p_rnu w_onebuf_opt.wo_rnu	/* 'relativenumber' */
#ifdef FEAT_LINEBREAK
    long	wo_nuw;
# define w_p_nuw w_onebuf_opt.wo_nuw	/* 'numberwidth' */
#endif
#if defined(FEAT_WINDOWS)
    int		wo_wfh;
# define w_p_wfh w_onebuf_opt.wo_wfh	/* 'winfixheight' */
    int		wo_wfw;
# define w_p_wfw w_onebuf_opt.wo_wfw	/* 'winfixwidth' */
#endif
#if defined(FEAT_WINDOWS) && defined(FEAT_QUICKFIX)
    int		wo_pvw;
# define w_p_pvw w_onebuf_opt.wo_pvw	/* 'previewwindow' */
#endif
#ifdef FEAT_RIGHTLEFT
    int		wo_rl;
# define w_p_rl w_onebuf_opt.wo_rl	/* 'rightleft' */
    char_u	*wo_rlc;
# define w_p_rlc w_onebuf_opt.wo_rlc	/* 'rightleftcmd' */
#endif
    long	wo_scr;
#define w_p_scr w_onebuf_opt.wo_scr	/* 'scroll' */
#ifdef FEAT_SPELL
    int		wo_spell;
# define w_p_spell w_onebuf_opt.wo_spell /* 'spell' */
#endif
#ifdef FEAT_SYN_HL
    int		wo_cuc;
# define w_p_cuc w_onebuf_opt.wo_cuc	/* 'cursorcolumn' */
    int		wo_cul;
# define w_p_cul w_onebuf_opt.wo_cul	/* 'cursorline' */
    char_u	*wo_cc;
# define w_p_cc w_onebuf_opt.wo_cc	/* 'colorcolumn' */
#endif
#ifdef FEAT_STL_OPT
    char_u	*wo_stl;
#define w_p_stl w_onebuf_opt.wo_stl	/* 'statusline' */
#endif
#ifdef FEAT_SCROLLBIND
    int		wo_scb;
# define w_p_scb w_onebuf_opt.wo_scb	/* 'scrollbind' */
#endif
    int		wo_wrap;
#define w_p_wrap w_onebuf_opt.wo_wrap	/* 'wrap' */
#ifdef FEAT_CONCEAL
    char_u	*wo_cocu;		/* 'concealcursor' */
# define w_p_cocu w_onebuf_opt.wo_cocu
    long	wo_cole;		/* 'conceallevel' */
# define w_p_cole w_onebuf_opt.wo_cole
#endif
#ifdef FEAT_CURSORBIND
    int		wo_crb;
# define w_p_crb w_onebuf_opt.wo_crb	/* 'cursorbind' */
#endif

#ifdef FEAT_EVAL
    int		wo_scriptID[WV_COUNT];	/* SIDs for window-local options */
# define w_p_scriptID w_onebuf_opt.wo_scriptID
#endif
} winopt_T;

/*
 * Window info stored with a buffer.
 *
 * Two types of info are kept for a buffer which are associated with a
 * specific window:
 * 1. Each window can have a different line number associated with a buffer.
 * 2. The window-local options for a buffer work in a similar way.
 * The window-info is kept in a list at b_wininfo.  It is kept in
 * most-recently-used order.
 */
struct wininfo_S
{
    wininfo_T	*wi_next;	/* next entry or NULL for last entry */
    wininfo_T	*wi_prev;	/* previous entry or NULL for first entry */
    win_T	*wi_win;	/* pointer to window that did set wi_fpos */
    pos_T	wi_fpos;	/* last cursor position in the file */
    int		wi_optset;	/* TRUE when wi_opt has useful values */
    winopt_T	wi_opt;		/* local window options */
#ifdef FEAT_FOLDING
    int		wi_fold_manual;	/* copy of w_fold_manual */
    garray_T	wi_folds;	/* clone of w_folds */
#endif
};

/*
 * Info used to pass info about a fold from the fold-detection code to the
 * code that displays the foldcolumn.
 */
typedef struct foldinfo
{
    int		fi_level;	/* level of the fold; when this is zero the
				   other fields are invalid */
    int		fi_lnum;	/* line number where fold starts */
    int		fi_low_level;	/* lowest fold level that starts in the same
				   line */
} foldinfo_T;

/* Structure to store info about the Visual area. */
typedef struct
{
    pos_T	vi_start;	/* start pos of last VIsual */
    pos_T	vi_end;		/* end position of last VIsual */
    int		vi_mode;	/* VIsual_mode of last VIsual */
    colnr_T	vi_curswant;	/* MAXCOL from w_curswant */
} visualinfo_T;

/*
 * structures used for undo
 */

typedef struct u_entry u_entry_T;
typedef struct u_header u_header_T;
struct u_entry
{
    u_entry_T	*ue_next;	/* pointer to next entry in list */
    linenr_T	ue_top;		/* number of line above undo block */
    linenr_T	ue_bot;		/* number of line below undo block */
    linenr_T	ue_lcount;	/* linecount when u_save called */
    char_u	**ue_array;	/* array of lines in undo block */
    long	ue_size;	/* number of lines in ue_array */
#ifdef U_DEBUG
    int		ue_magic;	/* magic number to check allocation */
#endif
};

struct u_header
{
    /* The following have a pointer and a number. The number is used when
     * reading the undo file in u_read_undo() */
    union {
	u_header_T *ptr;	/* pointer to next undo header in list */
	long	   seq;
    } uh_next;
    union {
	u_header_T *ptr;	/* pointer to previous header in list */
	long	   seq;
    } uh_prev;
    union {
	u_header_T *ptr;	/* pointer to next header for alt. redo */
	long	   seq;
    } uh_alt_next;
    union {
	u_header_T *ptr;	/* pointer to previous header for alt. redo */
	long	   seq;
    } uh_alt_prev;
    long	uh_seq;		/* sequence number, higher == newer undo */
    int		uh_walk;	/* used by undo_time() */
    u_entry_T	*uh_entry;	/* pointer to first entry */
    u_entry_T	*uh_getbot_entry; /* pointer to where ue_bot must be set */
    pos_T	uh_cursor;	/* cursor position before saving */
#ifdef FEAT_VIRTUALEDIT
    long	uh_cursor_vcol;
#endif
    int		uh_flags;	/* see below */
    pos_T	uh_namedm[NMARKS];	/* marks before undo/after redo */
#ifdef FEAT_VISUAL
    visualinfo_T uh_visual;	/* Visual areas before undo/after redo */
#endif
    time_t	uh_time;	/* timestamp when the change was made */
    long	uh_save_nr;	/* set when the file was saved after the
				   changes in this block */
#ifdef U_DEBUG
    int		uh_magic;	/* magic number to check allocation */
#endif
};

/* values for uh_flags */
#define UH_CHANGED  0x01	/* b_changed flag before undo/after redo */
#define UH_EMPTYBUF 0x02	/* buffer was empty */

/*
 * structures used in undo.c
 */
#if SIZEOF_INT > 2
# define ALIGN_LONG	/* longword alignment and use filler byte */
# define ALIGN_SIZE (sizeof(long))
#else
# define ALIGN_SIZE (sizeof(short))
#endif

#define ALIGN_MASK (ALIGN_SIZE - 1)

typedef struct m_info minfo_T;

/*
 * structure used to link chunks in one of the free chunk lists.
 */
struct m_info
{
#ifdef ALIGN_LONG
    long_u	m_size;		/* size of the chunk (including m_info) */
#else
    short_u	m_size;		/* size of the chunk (including m_info) */
#endif
    minfo_T	*m_next;	/* pointer to next free chunk in the list */
};

/*
 * things used in memfile.c
 */

typedef struct block_hdr    bhdr_T;
typedef struct memfile	    memfile_T;
typedef long		    blocknr_T;

/*
 * mf_hashtab_T is a chained hashtable with blocknr_T key and arbitrary
 * structures as items.  This is an intrusive data structure: we require
 * that items begin with mf_hashitem_T which contains the key and linked
 * list pointers.  List of items in each bucket is doubly-linked.
 */

typedef struct mf_hashitem_S mf_hashitem_T;

struct mf_hashitem_S
{
    mf_hashitem_T   *mhi_next;
    mf_hashitem_T   *mhi_prev;
    blocknr_T	    mhi_key;
};

#define MHT_INIT_SIZE   64

typedef struct mf_hashtab_S
{
    long_u	    mht_mask;	    /* mask used for hash value (nr of items
				     * in array is "mht_mask" + 1) */
    long_u	    mht_count;	    /* nr of items inserted into hashtable */
    mf_hashitem_T   **mht_buckets;  /* points to mht_small_buckets or
				     *dynamically allocated array */
    mf_hashitem_T   *mht_small_buckets[MHT_INIT_SIZE];   /* initial buckets */
    char	    mht_fixed;	    /* non-zero value forbids growth */
} mf_hashtab_T;

/*
 * for each (previously) used block in the memfile there is one block header.
 *
 * The block may be linked in the used list OR in the free list.
 * The used blocks are also kept in hash lists.
 *
 * The used list is a doubly linked list, most recently used block first.
 *	The blocks in the used list have a block of memory allocated.
 *	mf_used_count is the number of pages in the used list.
 * The hash lists are used to quickly find a block in the used list.
 * The free list is a single linked list, not sorted.
 *	The blocks in the free list have no block of memory allocated and
 *	the contents of the block in the file (if any) is irrelevant.
 */

struct block_hdr
{
    mf_hashitem_T bh_hashitem;      /* header for hash table and key */
#define bh_bnum bh_hashitem.mhi_key /* block number, part of bh_hashitem */

    bhdr_T	*bh_next;	    /* next block_hdr in free or used list */
    bhdr_T	*bh_prev;	    /* previous block_hdr in used list */
    char_u	*bh_data;	    /* pointer to memory (for used block) */
    int		bh_page_count;	    /* number of pages in this block */

#define BH_DIRTY    1
#define BH_LOCKED   2
    char	bh_flags;	    /* BH_DIRTY or BH_LOCKED */
};

/*
 * when a block with a negative number is flushed to the file, it gets
 * a positive number. Because the reference to the block is still the negative
 * number, we remember the translation to the new positive number in the
 * double linked trans lists. The structure is the same as the hash lists.
 */
typedef struct nr_trans NR_TRANS;

struct nr_trans
{
    mf_hashitem_T nt_hashitem;		/* header for hash table and key */
#define nt_old_bnum nt_hashitem.mhi_key	/* old, negative, number */

    blocknr_T	nt_new_bnum;		/* new, positive, number */
};

/*
 * structure used to store one block of the stuff/redo/recording buffers
 */
struct buffblock
{
    struct buffblock	*b_next;	/* pointer to next buffblock */
    char_u		b_str[1];	/* contents (actually longer) */
};

/*
 * header used for the stuff buffer and the redo buffer
 */
struct buffheader
{
    struct buffblock	bh_first;	/* first (dummy) block of list */
    struct buffblock	*bh_curr;	/* buffblock for appending */
    int			bh_index;	/* index for reading */
    int			bh_space;	/* space in bh_curr for appending */
};

/*
 * used for completion on the command line
 */
typedef struct expand
{
    int		xp_context;		/* type of expansion */
    char_u	*xp_pattern;		/* start of item to expand */
    int		xp_pattern_len;		/* bytes in xp_pattern before cursor */
#if defined(FEAT_USR_CMDS) && defined(FEAT_EVAL) && defined(FEAT_CMDL_COMPL)
    char_u	*xp_arg;		/* completion function */
    int		xp_scriptID;		/* SID for completion function */
#endif
    int		xp_backslash;		/* one of the XP_BS_ values */
#ifndef BACKSLASH_IN_FILENAME
    int		xp_shell;		/* TRUE for a shell command, more
					   characters need to be escaped */
#endif
    int		xp_numfiles;		/* number of files found by
						    file name completion */
    char_u	**xp_files;		/* list of files */
} expand_T;

/* values for xp_backslash */
#define XP_BS_NONE	0	/* nothing special for backslashes */
#define XP_BS_ONE	1	/* uses one backslash before a space */
#define XP_BS_THREE	2	/* uses three backslashes before a space */

/*
 * Command modifiers ":vertical", ":browse", ":confirm" and ":hide" set a flag.
 * This needs to be saved for recursive commands, put them in a structure for
 * easy manipulation.
 */
typedef struct
{
    int		hide;			/* TRUE when ":hide" was used */
# ifdef FEAT_BROWSE_CMD
    int		browse;			/* TRUE to invoke file dialog */
# endif
# ifdef FEAT_WINDOWS
    int		split;			/* flags for win_split() */
    int		tab;			/* > 0 when ":tab" was used */
# endif
# if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
    int		confirm;		/* TRUE to invoke yes/no dialog */
# endif
    int		keepalt;		/* TRUE when ":keepalt" was used */
    int		keepmarks;		/* TRUE when ":keepmarks" was used */
    int		keepjumps;		/* TRUE when ":keepjumps" was used */
    int		lockmarks;		/* TRUE when ":lockmarks" was used */
# ifdef FEAT_AUTOCMD
    char_u	*save_ei;		/* saved value of 'eventignore' */
# endif
} cmdmod_T;

#define MF_SEED_LEN	8

struct memfile
{
    char_u	*mf_fname;		/* name of the file */
    char_u	*mf_ffname;		/* idem, full path */
    int		mf_fd;			/* file descriptor */
    bhdr_T	*mf_free_first;		/* first block_hdr in free list */
    bhdr_T	*mf_used_first;		/* mru block_hdr in used list */
    bhdr_T	*mf_used_last;		/* lru block_hdr in used list */
    unsigned	mf_used_count;		/* number of pages in used list */
    unsigned	mf_used_count_max;	/* maximum number of pages in memory */
    mf_hashtab_T mf_hash;		/* hash lists */
    mf_hashtab_T mf_trans;		/* trans lists */
    blocknr_T	mf_blocknr_max;		/* highest positive block number + 1*/
    blocknr_T	mf_blocknr_min;		/* lowest negative block number - 1 */
    blocknr_T	mf_neg_count;		/* number of negative blocks numbers */
    blocknr_T	mf_infile_count;	/* number of pages in the file */
    unsigned	mf_page_size;		/* number of bytes in a page */
    int		mf_dirty;		/* TRUE if there are dirty blocks */
#ifdef FEAT_CRYPT
    buf_T	*mf_buffer;		/* bufer this memfile is for */
    char_u	mf_seed[MF_SEED_LEN];	/* seed for encryption */

    /* Values for key, method and seed used for reading data blocks when
     * updating for a newly set key or method. Only when mf_old_key != NULL. */
    char_u	*mf_old_key;
    int		mf_old_cm;
    char_u	mf_old_seed[MF_SEED_LEN];
#endif
};

/*
 * things used in memline.c
 */
/*
 * When searching for a specific line, we remember what blocks in the tree
 * are the branches leading to that block. This is stored in ml_stack.  Each
 * entry is a pointer to info in a block (may be data block or pointer block)
 */
typedef struct info_pointer
{
    blocknr_T	ip_bnum;	/* block number */
    linenr_T	ip_low;		/* lowest lnum in this block */
    linenr_T	ip_high;	/* highest lnum in this block */
    int		ip_index;	/* index for block with current lnum */
} infoptr_T;	/* block/index pair */

#ifdef FEAT_BYTEOFF
typedef struct ml_chunksize
{
    int		mlcs_numlines;
    long	mlcs_totalsize;
} chunksize_T;

 /* Flags when calling ml_updatechunk() */

#define ML_CHNK_ADDLINE 1
#define ML_CHNK_DELLINE 2
#define ML_CHNK_UPDLINE 3
#endif

/*
 * the memline structure holds all the information about a memline
 */
typedef struct memline
{
    linenr_T	ml_line_count;	/* number of lines in the buffer */

    memfile_T	*ml_mfp;	/* pointer to associated memfile */

#define ML_EMPTY	1	/* empty buffer */
#define ML_LINE_DIRTY	2	/* cached line was changed and allocated */
#define ML_LOCKED_DIRTY	4	/* ml_locked was changed */
#define ML_LOCKED_POS	8	/* ml_locked needs positive block number */
    int		ml_flags;

    infoptr_T	*ml_stack;	/* stack of pointer blocks (array of IPTRs) */
    int		ml_stack_top;	/* current top if ml_stack */
    int		ml_stack_size;	/* total number of entries in ml_stack */

    linenr_T	ml_line_lnum;	/* line number of cached line, 0 if not valid */
    char_u	*ml_line_ptr;	/* pointer to cached line */

    bhdr_T	*ml_locked;	/* block used by last ml_get */
    linenr_T	ml_locked_low;	/* first line in ml_locked */
    linenr_T	ml_locked_high;	/* last line in ml_locked */
    int		ml_locked_lineadd;  /* number of lines inserted in ml_locked */
#ifdef FEAT_BYTEOFF
    chunksize_T *ml_chunksize;
    int		ml_numchunks;
    int		ml_usedchunks;
#endif
} memline_T;

#if defined(FEAT_SIGNS) || defined(PROTO)
typedef struct signlist signlist_T;

struct signlist
{
    int		id;		/* unique identifier for each placed sign */
    linenr_T	lnum;		/* line number which has this sign */
    int		typenr;		/* typenr of sign */
    signlist_T	*next;		/* next signlist entry */
# ifdef FEAT_NETBEANS_INTG
    signlist_T  *prev;		/* previous entry -- for easy reordering */
# endif
};

/* type argument for buf_getsigntype() */
#define SIGN_ANY	0
#define SIGN_LINEHL	1
#define SIGN_ICON	2
#define SIGN_TEXT	3
#endif

/*
 * Argument list: Array of file names.
 * Used for the global argument list and the argument lists local to a window.
 */
typedef struct arglist
{
    garray_T	al_ga;		/* growarray with the array of file names */
    int		al_refcount;	/* number of windows using this arglist */
} alist_T;

/*
 * For each argument remember the file name as it was given, and the buffer
 * number that contains the expanded file name (required for when ":cd" is
 * used.
 */
typedef struct argentry
{
    char_u	*ae_fname;	/* file name as specified */
    int		ae_fnum;	/* buffer number with expanded file name */
} aentry_T;

#ifdef FEAT_WINDOWS
# define ALIST(win) (win)->w_alist
#else
# define ALIST(win) (&global_alist)
#endif
#define GARGLIST	((aentry_T *)global_alist.al_ga.ga_data)
#define ARGLIST		((aentry_T *)ALIST(curwin)->al_ga.ga_data)
#define WARGLIST(wp)	((aentry_T *)ALIST(wp)->al_ga.ga_data)
#define AARGLIST(al)	((aentry_T *)((al)->al_ga.ga_data))
#define GARGCOUNT	(global_alist.al_ga.ga_len)
#define ARGCOUNT	(ALIST(curwin)->al_ga.ga_len)
#define WARGCOUNT(wp)	(ALIST(wp)->al_ga.ga_len)

/*
 * A list used for saving values of "emsg_silent".  Used by ex_try() to save the
 * value of "emsg_silent" if it was non-zero.  When this is done, the CSF_SILENT
 * flag below is set.
 */

typedef struct eslist_elem eslist_T;
struct eslist_elem
{
    int		saved_emsg_silent;	/* saved value of "emsg_silent" */
    eslist_T	*next;			/* next element on the list */
};

/*
 * For conditional commands a stack is kept of nested conditionals.
 * When cs_idx < 0, there is no conditional command.
 */
#define CSTACK_LEN	50

struct condstack
{
    short	cs_flags[CSTACK_LEN];	/* CSF_ flags */
    char	cs_pending[CSTACK_LEN];	/* CSTP_: what's pending in ":finally"*/
    union {
	void	*csp_rv[CSTACK_LEN];	/* return typeval for pending return */
	void	*csp_ex[CSTACK_LEN];	/* exception for pending throw */
    }		cs_pend;
    void	*cs_forinfo[CSTACK_LEN]; /* info used by ":for" */
    int		cs_line[CSTACK_LEN];	/* line nr of ":while"/":for" line */
    int		cs_idx;			/* current entry, or -1 if none */
    int		cs_looplevel;		/* nr of nested ":while"s and ":for"s */
    int		cs_trylevel;		/* nr of nested ":try"s */
    eslist_T	*cs_emsg_silent_list;	/* saved values of "emsg_silent" */
    char	cs_lflags;		/* loop flags: CSL_ flags */
};
# define cs_rettv	cs_pend.csp_rv
# define cs_exception	cs_pend.csp_ex

/* There is no CSF_IF, the lack of CSF_WHILE, CSF_FOR and CSF_TRY means ":if"
 * was used. */
# define CSF_TRUE	0x0001	/* condition was TRUE */
# define CSF_ACTIVE	0x0002	/* current state is active */
# define CSF_ELSE	0x0004	/* ":else" has been passed */
# define CSF_WHILE	0x0008	/* is a ":while" */
# define CSF_FOR	0x0010	/* is a ":for" */

# define CSF_TRY	0x0100	/* is a ":try" */
# define CSF_FINALLY	0x0200	/* ":finally" has been passed */
# define CSF_THROWN	0x0400	/* exception thrown to this try conditional */
# define CSF_CAUGHT	0x0800  /* exception caught by this try conditional */
# define CSF_SILENT	0x1000	/* "emsg_silent" reset by ":try" */
/* Note that CSF_ELSE is only used when CSF_TRY and CSF_WHILE are unset
 * (an ":if"), and CSF_SILENT is only used when CSF_TRY is set. */

/*
 * What's pending for being reactivated at the ":endtry" of this try
 * conditional:
 */
# define CSTP_NONE	0	/* nothing pending in ":finally" clause */
# define CSTP_ERROR	1	/* an error is pending */
# define CSTP_INTERRUPT	2	/* an interrupt is pending */
# define CSTP_THROW	4	/* a throw is pending */
# define CSTP_BREAK	8	/* ":break" is pending */
# define CSTP_CONTINUE	16	/* ":continue" is pending */
# define CSTP_RETURN	24	/* ":return" is pending */
# define CSTP_FINISH	32	/* ":finish" is pending */

/*
 * Flags for the cs_lflags item in struct condstack.
 */
# define CSL_HAD_LOOP	 1	/* just found ":while" or ":for" */
# define CSL_HAD_ENDLOOP 2	/* just found ":endwhile" or ":endfor" */
# define CSL_HAD_CONT	 4	/* just found ":continue" */
# define CSL_HAD_FINA	 8	/* just found ":finally" */

/*
 * A list of error messages that can be converted to an exception.  "throw_msg"
 * is only set in the first element of the list.  Usually, it points to the
 * original message stored in that element, but sometimes it points to a later
 * message in the list.  See cause_errthrow() below.
 */
struct msglist
{
    char_u		*msg;		/* original message */
    char_u		*throw_msg;	/* msg to throw: usually original one */
    struct msglist	*next;		/* next of several messages in a row */
};

/*
 * Structure describing an exception.
 * (don't use "struct exception", it's used by the math library).
 */
typedef struct vim_exception except_T;
struct vim_exception
{
    int			type;		/* exception type */
    char_u		*value;		/* exception value */
    struct msglist	*messages;	/* message(s) causing error exception */
    char_u		*throw_name;	/* name of the throw point */
    linenr_T		throw_lnum;	/* line number of the throw point */
    except_T		*caught;	/* next exception on the caught stack */
};

/*
 * The exception types.
 */
#define ET_USER		0	/* exception caused by ":throw" command */
#define ET_ERROR	1	/* error exception */
#define ET_INTERRUPT	2	/* interrupt exception triggered by Ctrl-C */

/*
 * Structure to save the error/interrupt/exception state between calls to
 * enter_cleanup() and leave_cleanup().  Must be allocated as an automatic
 * variable by the (common) caller of these functions.
 */
typedef struct cleanup_stuff cleanup_T;
struct cleanup_stuff
{
    int pending;		/* error/interrupt/exception state */
    except_T *exception;	/* exception value */
};

#ifdef FEAT_SYN_HL
/* struct passed to in_id_list() */
struct sp_syn
{
    int		inc_tag;	/* ":syn include" unique tag */
    short	id;		/* highlight group ID of item */
    short	*cont_in_list;	/* cont.in group IDs, if non-zero */
};

/*
 * Each keyword has one keyentry, which is linked in a hash list.
 */
typedef struct keyentry keyentry_T;

struct keyentry
{
    keyentry_T	*ke_next;	/* next entry with identical "keyword[]" */
    struct sp_syn k_syn;	/* struct passed to in_id_list() */
    short	*next_list;	/* ID list for next match (if non-zero) */
    int		flags;
    int		k_char;		/* conceal substitute character */
    char_u	keyword[1];	/* actually longer */
};

/*
 * Struct used to store one state of the state stack.
 */
typedef struct buf_state
{
    int		    bs_idx;	 /* index of pattern */
    int		    bs_flags;	 /* flags for pattern */
#ifdef FEAT_CONCEAL
    int		    bs_seqnr;	 /* stores si_seqnr */
    int		    bs_cchar;	 /* stores si_cchar */
#endif
    reg_extmatch_T *bs_extmatch; /* external matches from start pattern */
} bufstate_T;

/*
 * syn_state contains the syntax state stack for the start of one line.
 * Used by b_sst_array[].
 */
typedef struct syn_state synstate_T;

struct syn_state
{
    synstate_T	*sst_next;	/* next entry in used or free list */
    linenr_T	sst_lnum;	/* line number for this state */
    union
    {
	bufstate_T	sst_stack[SST_FIX_STATES]; /* short state stack */
	garray_T	sst_ga;	/* growarray for long state stack */
    } sst_union;
    int		sst_next_flags;	/* flags for sst_next_list */
    int		sst_stacksize;	/* number of states on the stack */
    short	*sst_next_list;	/* "nextgroup" list in this state
				 * (this is a copy, don't free it! */
    disptick_T	sst_tick;	/* tick when last displayed */
    linenr_T	sst_change_lnum;/* when non-zero, change in this line
				 * may have made the state invalid */
};
#endif /* FEAT_SYN_HL */

/*
 * Structure shared between syntax.c, screen.c and gui_x11.c.
 */
typedef struct attr_entry
{
    short	    ae_attr;		/* HL_BOLD, etc. */
    union
    {
	struct
	{
	    char_u	    *start;	/* start escape sequence */
	    char_u	    *stop;	/* stop escape sequence */
	} term;
	struct
	{
	    /* These colors need to be > 8 bits to hold 256. */
	    short_u	    fg_color;	/* foreground color number */
	    short_u	    bg_color;	/* background color number */
	} cterm;
# ifdef FEAT_GUI
	struct
	{
	    guicolor_T	    fg_color;	/* foreground color handle */
	    guicolor_T	    bg_color;	/* background color handle */
	    guicolor_T	    sp_color;	/* special color handle */
	    GuiFont	    font;	/* font handle */
#  ifdef FEAT_XFONTSET
	    GuiFontset	    fontset;	/* fontset handle */
#  endif
	} gui;
# endif
    } ae_u;
} attrentry_T;

#ifdef USE_ICONV
# ifdef HAVE_ICONV_H
#  include <iconv.h>
# else
#  if defined(MACOS_X)
#   include <sys/errno.h>
#   define EILSEQ ENOENT /* MacOS X does not have EILSEQ */
typedef struct _iconv_t *iconv_t;
#  else
#   if defined(MACOS_CLASSIC)
typedef struct _iconv_t *iconv_t;
#    define EINVAL	22
#    define E2BIG	7
#    define ENOENT	2
#    define EFAULT	14
#    define EILSEQ	123
#   else
#    include <errno.h>
#   endif
#  endif
typedef void *iconv_t;
# endif
#endif

/*
 * Used for the typeahead buffer: typebuf.
 */
typedef struct
{
    char_u	*tb_buf;	/* buffer for typed characters */
    char_u	*tb_noremap;	/* mapping flags for characters in tb_buf[] */
    int		tb_buflen;	/* size of tb_buf[] */
    int		tb_off;		/* current position in tb_buf[] */
    int		tb_len;		/* number of valid bytes in tb_buf[] */
    int		tb_maplen;	/* nr of mapped bytes in tb_buf[] */
    int		tb_silent;	/* nr of silently mapped bytes in tb_buf[] */
    int		tb_no_abbr_cnt; /* nr of bytes without abbrev. in tb_buf[] */
    int		tb_change_cnt;	/* nr of time tb_buf was changed; never zero */
} typebuf_T;

/* Struct to hold the saved typeahead for save_typeahead(). */
typedef struct
{
    typebuf_T		save_typebuf;
    int			typebuf_valid;	    /* TRUE when save_typebuf valid */
    int			old_char;
    int			old_mod_mask;
    struct buffheader	save_stuffbuff;
#ifdef USE_INPUT_BUF
    char_u		*save_inputbuf;
#endif
} tasave_T;

/*
 * Used for conversion of terminal I/O and script files.
 */
typedef struct
{
    int		vc_type;	/* zero or one of the CONV_ values */
    int		vc_factor;	/* max. expansion factor */
# ifdef WIN3264
    int		vc_cpfrom;	/* codepage to convert from (CONV_CODEPAGE) */
    int		vc_cpto;	/* codepage to convert to (CONV_CODEPAGE) */
# endif
# ifdef USE_ICONV
    iconv_t	vc_fd;		/* for CONV_ICONV */
# endif
    int		vc_fail;	/* fail for invalid char, don't use '?' */
} vimconv_T;

/*
 * Structure used for reading from the viminfo file.
 */
typedef struct
{
    char_u	*vir_line;	/* text of the current line */
    FILE	*vir_fd;	/* file descriptor */
#ifdef FEAT_MBYTE
    vimconv_T	vir_conv;	/* encoding conversion */
#endif
} vir_T;

#define CONV_NONE		0
#define CONV_TO_UTF8		1
#define CONV_9_TO_UTF8		2
#define CONV_TO_LATIN1		3
#define CONV_TO_LATIN9		4
#define CONV_ICONV		5
#ifdef WIN3264
# define CONV_CODEPAGE		10	/* codepage -> codepage */
#endif
#ifdef MACOS_X
# define CONV_MAC_LATIN1	20
# define CONV_LATIN1_MAC	21
# define CONV_MAC_UTF8		22
# define CONV_UTF8_MAC		23
#endif

/*
 * Structure used for mappings and abbreviations.
 */
typedef struct mapblock mapblock_T;
struct mapblock
{
    mapblock_T	*m_next;	/* next mapblock in list */
    char_u	*m_keys;	/* mapped from, lhs */
    int		m_keylen;	/* strlen(m_keys) */
    char_u	*m_str;		/* mapped to, rhs */
    char_u	*m_orig_str;	/* rhs as entered by the user */
    int		m_mode;		/* valid mode */
    int		m_noremap;	/* if non-zero no re-mapping for m_str */
    char	m_silent;	/* <silent> used, don't echo commands */
#ifdef FEAT_EVAL
    char	m_expr;		/* <expr> used, m_str is an expression */
    scid_T	m_script_ID;	/* ID of script where map was defined */
#endif
};

/*
 * Used for highlighting in the status line.
 */
struct stl_hlrec
{
    char_u	*start;
    int		userhl;		/* 0: no HL, 1-9: User HL, < 0 for syn ID */
};


/*
 * Syntax items - usually buffer-specific.
 */

/* Item for a hashtable.  "hi_key" can be one of three values:
 * NULL:	   Never been used
 * HI_KEY_REMOVED: Entry was removed
 * Otherwise:	   Used item, pointer to the actual key; this usually is
 *		   inside the item, subtract an offset to locate the item.
 *		   This reduces the size of hashitem by 1/3.
 */
typedef struct hashitem_S
{
    long_u	hi_hash;	/* cached hash number of hi_key */
    char_u	*hi_key;
} hashitem_T;

/* The address of "hash_removed" is used as a magic number for hi_key to
 * indicate a removed item. */
#define HI_KEY_REMOVED &hash_removed
#define HASHITEM_EMPTY(hi) ((hi)->hi_key == NULL || (hi)->hi_key == &hash_removed)

/* Initial size for a hashtable.  Our items are relatively small and growing
 * is expensive, thus use 16 as a start.  Must be a power of 2. */
#define HT_INIT_SIZE 16

typedef struct hashtable_S
{
    long_u	ht_mask;	/* mask used for hash value (nr of items in
				 * array is "ht_mask" + 1) */
    long_u	ht_used;	/* number of items used */
    long_u	ht_filled;	/* number of items used + removed */
    int		ht_locked;	/* counter for hash_lock() */
    int		ht_error;	/* when set growing failed, can't add more
				   items before growing works */
    hashitem_T	*ht_array;	/* points to the array, allocated when it's
				   not "ht_smallarray" */
    hashitem_T	ht_smallarray[HT_INIT_SIZE];   /* initial array */
} hashtab_T;

typedef long_u hash_T;		/* Type for hi_hash */


#if SIZEOF_INT <= 3		/* use long if int is smaller than 32 bits */
typedef long	varnumber_T;
#else
typedef int	varnumber_T;
#endif
typedef double	float_T;

typedef struct listvar_S list_T;
typedef struct dictvar_S dict_T;

/*
 * Structure to hold an internal variable without a name.
 */
typedef struct
{
    char	v_type;	    /* see below: VAR_NUMBER, VAR_STRING, etc. */
    char	v_lock;	    /* see below: VAR_LOCKED, VAR_FIXED */
    union
    {
	varnumber_T	v_number;	/* number value */
#ifdef FEAT_FLOAT
	float_T		v_float;	/* floating number value */
#endif
	char_u		*v_string;	/* string value (can be NULL!) */
	list_T		*v_list;	/* list value (can be NULL!) */
	dict_T		*v_dict;	/* dict value (can be NULL!) */
    }		vval;
} typval_T;

/* Values for "v_type". */
#define VAR_UNKNOWN 0
#define VAR_NUMBER  1	/* "v_number" is used */
#define VAR_STRING  2	/* "v_string" is used */
#define VAR_FUNC    3	/* "v_string" is function name */
#define VAR_LIST    4	/* "v_list" is used */
#define VAR_DICT    5	/* "v_dict" is used */
#define VAR_FLOAT   6	/* "v_float" is used */

/* Values for "dv_scope". */
#define VAR_SCOPE     1	/* a:, v:, s:, etc. scope dictionaries */
#define VAR_DEF_SCOPE 2	/* l:, g: scope dictionaries: here funcrefs are not
			   allowed to mask existing functions */

/* Values for "v_lock". */
#define VAR_LOCKED  1	/* locked with lock(), can use unlock() */
#define VAR_FIXED   2	/* locked forever */

/*
 * Structure to hold an item of a list: an internal variable without a name.
 */
typedef struct listitem_S listitem_T;

struct listitem_S
{
    listitem_T	*li_next;	/* next item in list */
    listitem_T	*li_prev;	/* previous item in list */
    typval_T	li_tv;		/* type and value of the variable */
};

/*
 * Struct used by those that are using an item in a list.
 */
typedef struct listwatch_S listwatch_T;

struct listwatch_S
{
    listitem_T		*lw_item;	/* item being watched */
    listwatch_T		*lw_next;	/* next watcher */
};

/*
 * Structure to hold info about a list.
 */
struct listvar_S
{
    listitem_T	*lv_first;	/* first item, NULL if none */
    listitem_T	*lv_last;	/* last item, NULL if none */
    int		lv_refcount;	/* reference count */
    int		lv_len;		/* number of items */
    listwatch_T	*lv_watch;	/* first watcher, NULL if none */
    int		lv_idx;		/* cached index of an item */
    listitem_T	*lv_idx_item;	/* when not NULL item at index "lv_idx" */
    int		lv_copyID;	/* ID used by deepcopy() */
    list_T	*lv_copylist;	/* copied list used by deepcopy() */
    char	lv_lock;	/* zero, VAR_LOCKED, VAR_FIXED */
    list_T	*lv_used_next;	/* next list in used lists list */
    list_T	*lv_used_prev;	/* previous list in used lists list */
};

/*
 * Structure to hold an item of a Dictionary.
 * Also used for a variable.
 * The key is copied into "di_key" to avoid an extra alloc/free for it.
 */
struct dictitem_S
{
    typval_T	di_tv;		/* type and value of the variable */
    char_u	di_flags;	/* flags (only used for variable) */
    char_u	di_key[1];	/* key (actually longer!) */
};

typedef struct dictitem_S dictitem_T;

#define DI_FLAGS_RO	1 /* "di_flags" value: read-only variable */
#define DI_FLAGS_RO_SBX 2 /* "di_flags" value: read-only in the sandbox */
#define DI_FLAGS_FIX	4 /* "di_flags" value: fixed variable, not allocated */
#define DI_FLAGS_LOCK	8 /* "di_flags" value: locked variable */

/*
 * Structure to hold info about a Dictionary.
 */
struct dictvar_S
{
    int		dv_refcount;	/* reference count */
    hashtab_T	dv_hashtab;	/* hashtab that refers to the items */
    int		dv_copyID;	/* ID used by deepcopy() */
    dict_T	*dv_copydict;	/* copied dict used by deepcopy() */
    char	dv_lock;	/* zero, VAR_LOCKED, VAR_FIXED */
    char	dv_scope;	/* zero, VAR_SCOPE, VAR_DEF_SCOPE */
    dict_T	*dv_used_next;	/* next dict in used dicts list */
    dict_T	*dv_used_prev;	/* previous dict in used dicts list */
};

/* values for b_syn_spell: what to do with toplevel text */
#define SYNSPL_DEFAULT	0	/* spell check if @Spell not defined */
#define SYNSPL_TOP	1	/* spell check toplevel text */
#define SYNSPL_NOTOP	2	/* don't spell check toplevel text */

/* avoid #ifdefs for when b_spell is not available */
#ifdef FEAT_SPELL
# define B_SPELL(buf)  ((buf)->b_spell)
#else
# define B_SPELL(buf)  (0)
#endif

#ifdef FEAT_QUICKFIX
typedef struct qf_info_S qf_info_T;
#endif

#ifdef FEAT_RELTIME
/*
 * Used for :syntime: timing of executing a syntax pattern.
 */
typedef struct {
    proftime_T	total;		/* total time used */
    proftime_T	slowest;	/* time of slowest call */
    long	count;		/* nr of times used */
    long	match;		/* nr of times matched */
} syn_time_T;
#endif

/*
 * These are items normally related to a buffer.  But when using ":ownsyntax"
 * a window may have its own instance.
 */
typedef struct {
#ifdef FEAT_SYN_HL
    hashtab_T	b_keywtab;		/* syntax keywords hash table */
    hashtab_T	b_keywtab_ic;		/* idem, ignore case */
    int		b_syn_error;		/* TRUE when error occurred in HL */
    int		b_syn_ic;		/* ignore case for :syn cmds */
    int		b_syn_spell;		/* SYNSPL_ values */
    garray_T	b_syn_patterns;		/* table for syntax patterns */
    garray_T	b_syn_clusters;		/* table for syntax clusters */
    int		b_spell_cluster_id;	/* @Spell cluster ID or 0 */
    int		b_nospell_cluster_id;	/* @NoSpell cluster ID or 0 */
    int		b_syn_containedin;	/* TRUE when there is an item with a
					   "containedin" argument */
    int		b_syn_sync_flags;	/* flags about how to sync */
    short	b_syn_sync_id;		/* group to sync on */
    long	b_syn_sync_minlines;	/* minimal sync lines offset */
    long	b_syn_sync_maxlines;	/* maximal sync lines offset */
    long	b_syn_sync_linebreaks;	/* offset for multi-line pattern */
    char_u	*b_syn_linecont_pat;	/* line continuation pattern */
    regprog_T	*b_syn_linecont_prog;	/* line continuation program */
#ifdef FEAT_RELTIME
    syn_time_T  b_syn_linecont_time;
#endif
    int		b_syn_linecont_ic;	/* ignore-case flag for above */
    int		b_syn_topgrp;		/* for ":syntax include" */
# ifdef FEAT_CONCEAL
    int		b_syn_conceal;		/* auto-conceal for :syn cmds */
# endif
# ifdef FEAT_FOLDING
    int		b_syn_folditems;	/* number of patterns with the HL_FOLD
					   flag set */
# endif
    /*
     * b_sst_array[] contains the state stack for a number of lines, for the
     * start of that line (col == 0).  This avoids having to recompute the
     * syntax state too often.
     * b_sst_array[] is allocated to hold the state for all displayed lines,
     * and states for 1 out of about 20 other lines.
     * b_sst_array	pointer to an array of synstate_T
     * b_sst_len	number of entries in b_sst_array[]
     * b_sst_first	pointer to first used entry in b_sst_array[] or NULL
     * b_sst_firstfree	pointer to first free entry in b_sst_array[] or NULL
     * b_sst_freecount	number of free entries in b_sst_array[]
     * b_sst_check_lnum	entries after this lnum need to be checked for
     *			validity (MAXLNUM means no check needed)
     */
    synstate_T	*b_sst_array;
    int		b_sst_len;
    synstate_T	*b_sst_first;
    synstate_T	*b_sst_firstfree;
    int		b_sst_freecount;
    linenr_T	b_sst_check_lnum;
    short_u	b_sst_lasttick;	/* last display tick */
#endif /* FEAT_SYN_HL */

#ifdef FEAT_SPELL
    /* for spell checking */
    garray_T	b_langp;	/* list of pointers to slang_T, see spell.c */
    char_u	b_spell_ismw[256];/* flags: is midword char */
# ifdef FEAT_MBYTE
    char_u	*b_spell_ismw_mb; /* multi-byte midword chars */
# endif
    char_u	*b_p_spc;	/* 'spellcapcheck' */
    regprog_T	*b_cap_prog;	/* program for 'spellcapcheck' */
    char_u	*b_p_spf;	/* 'spellfile' */
    char_u	*b_p_spl;	/* 'spelllang' */
#endif
#if !defined(FEAT_SYN_HL) && !defined(FEAT_SPELL)
    int		dummy;
#endif
} synblock_T;


/*
 * buffer: structure that holds information about one file
 *
 * Several windows can share a single Buffer
 * A buffer is unallocated if there is no memfile for it.
 * A buffer is new if the associated file has never been loaded yet.
 */

struct file_buffer
{
    memline_T	b_ml;		/* associated memline (also contains line
				   count) */

    buf_T	*b_next;	/* links in list of buffers */
    buf_T	*b_prev;

    int		b_nwindows;	/* nr of windows open on this buffer */

    int		b_flags;	/* various BF_ flags */
#ifdef FEAT_AUTOCMD
    int		b_closing;	/* buffer is being closed, don't let
				   autocommands close it too. */
#endif

    /*
     * b_ffname has the full path of the file (NULL for no name).
     * b_sfname is the name as the user typed it (or NULL).
     * b_fname is the same as b_sfname, unless ":cd" has been done,
     *		then it is the same as b_ffname (NULL for no name).
     */
    char_u	*b_ffname;	/* full path file name */
    char_u	*b_sfname;	/* short file name */
    char_u	*b_fname;	/* current file name */

#ifdef UNIX
    int		b_dev_valid;	/* TRUE when b_dev has a valid number */
    dev_t	b_dev;		/* device number */
    ino_t	b_ino;		/* inode number */
#endif
#ifdef FEAT_CW_EDITOR
    FSSpec	b_FSSpec;	/* MacOS File Identification */
#endif
#ifdef VMS
    char	 b_fab_rfm;	/* Record format    */
    char	 b_fab_rat;	/* Record attribute */
    unsigned int b_fab_mrs;	/* Max record size  */
#endif
#ifdef FEAT_SNIFF
    int		b_sniff;	/* file was loaded through Sniff */
#endif

    int		b_fnum;		/* buffer number for this file. */

    int		b_changed;	/* 'modified': Set to TRUE if something in the
				   file has been changed and not written out. */
    int		b_changedtick;	/* incremented for each change, also for undo */

    int		b_saving;	/* Set to TRUE if we are in the middle of
				   saving the buffer. */

    /*
     * Changes to a buffer require updating of the display.  To minimize the
     * work, remember changes made and update everything at once.
     */
    int		b_mod_set;	/* TRUE when there are changes since the last
				   time the display was updated */
    linenr_T	b_mod_top;	/* topmost lnum that was changed */
    linenr_T	b_mod_bot;	/* lnum below last changed line, AFTER the
				   change */
    long	b_mod_xlines;	/* number of extra buffer lines inserted;
				   negative when lines were deleted */

    wininfo_T	*b_wininfo;	/* list of last used info for each window */

    long	b_mtime;	/* last change time of original file */
    long	b_mtime_read;	/* last change time when reading */
    off_t	b_orig_size;	/* size of original file in bytes */
    int		b_orig_mode;	/* mode of original file */

    pos_T	b_namedm[NMARKS]; /* current named marks (mark.c) */

#ifdef FEAT_VISUAL
    /* These variables are set when VIsual_active becomes FALSE */
    visualinfo_T b_visual;
# ifdef FEAT_EVAL
    int		b_visual_mode_eval;  /* b_visual.vi_mode for visualmode() */
# endif
#endif

    pos_T	b_last_cursor;	/* cursor position when last unloading this
				   buffer */
    pos_T	b_last_insert;	/* where Insert mode was left */
    pos_T	b_last_change;	/* position of last change: '. mark */

#ifdef FEAT_JUMPLIST
    /*
     * the changelist contains old change positions
     */
    pos_T	b_changelist[JUMPLISTSIZE];
    int		b_changelistlen;	/* number of active entries */
    int		b_new_change;		/* set by u_savecommon() */
#endif

    /*
     * Character table, only used in charset.c for 'iskeyword'
     * 32 bytes of 8 bits: 1 bit per character 0-255.
     */
    char_u	b_chartab[32];

#ifdef FEAT_LOCALMAP
    /* Table used for mappings local to a buffer. */
    mapblock_T	*(b_maphash[256]);

    /* First abbreviation local to a buffer. */
    mapblock_T	*b_first_abbr;
#endif
#ifdef FEAT_USR_CMDS
    /* User commands local to the buffer. */
    garray_T	b_ucmds;
#endif
    /*
     * start and end of an operator, also used for '[ and ']
     */
    pos_T	b_op_start;
    pos_T	b_op_end;

#ifdef FEAT_VIMINFO
    int		b_marks_read;	/* Have we read viminfo marks yet? */
#endif

    /*
     * The following only used in undo.c.
     */
    u_header_T	*b_u_oldhead;	/* pointer to oldest header */
    u_header_T	*b_u_newhead;	/* pointer to newest header; may not be valid
				   if b_u_curhead is not NULL */
    u_header_T	*b_u_curhead;	/* pointer to current header */
    int		b_u_numhead;	/* current number of headers */
    int		b_u_synced;	/* entry lists are synced */
    long	b_u_seq_last;	/* last used undo sequence number */
    long	b_u_save_nr_last; /* counter for last file write */
    long	b_u_seq_cur;	/* hu_seq of header below which we are now */
    time_t	b_u_time_cur;	/* uh_time of header below which we are now */
    long	b_u_save_nr_cur; /* file write nr after which we are now */

    /*
     * variables for "U" command in undo.c
     */
    char_u	*b_u_line_ptr;	/* saved line for "U" command */
    linenr_T	b_u_line_lnum;	/* line number of line in u_line */
    colnr_T	b_u_line_colnr;	/* optional column number */

#ifdef FEAT_INS_EXPAND
    int		b_scanned;	/* ^N/^P have scanned this buffer */
#endif

    /* flags for use of ":lmap" and IM control */
    long	b_p_iminsert;	/* input mode for insert */
    long	b_p_imsearch;	/* input mode for search */
#define B_IMODE_USE_INSERT -1	/*	Use b_p_iminsert value for search */
#define B_IMODE_NONE 0		/*	Input via none */
#define B_IMODE_LMAP 1		/*	Input via langmap */
#ifndef USE_IM_CONTROL
# define B_IMODE_LAST 1
#else
# define B_IMODE_IM 2		/*	Input via input method */
# define B_IMODE_LAST 2
#endif

#ifdef FEAT_KEYMAP
    short	b_kmap_state;	/* using "lmap" mappings */
# define KEYMAP_INIT	1	/* 'keymap' was set, call keymap_init() */
# define KEYMAP_LOADED	2	/* 'keymap' mappings have been loaded */
    garray_T	b_kmap_ga;	/* the keymap table */
#endif

    /*
     * Options local to a buffer.
     * They are here because their value depends on the type of file
     * or contents of the file being edited.
     */
    int		b_p_initialized;	/* set when options initialized */

#ifdef FEAT_EVAL
    int		b_p_scriptID[BV_COUNT];	/* SIDs for buffer-local options */
#endif

    int		b_p_ai;		/* 'autoindent' */
    int		b_p_ai_nopaste;	/* b_p_ai saved for paste mode */
    int		b_p_ci;		/* 'copyindent' */
    int		b_p_bin;	/* 'binary' */
#ifdef FEAT_MBYTE
    int		b_p_bomb;	/* 'bomb' */
#endif
#if defined(FEAT_QUICKFIX)
    char_u	*b_p_bh;	/* 'bufhidden' */
    char_u	*b_p_bt;	/* 'buftype' */
#endif
    int		b_p_bl;		/* 'buflisted' */
#ifdef FEAT_CINDENT
    int		b_p_cin;	/* 'cindent' */
    char_u	*b_p_cino;	/* 'cinoptions' */
    char_u	*b_p_cink;	/* 'cinkeys' */
#endif
#if defined(FEAT_CINDENT) || defined(FEAT_SMARTINDENT)
    char_u	*b_p_cinw;	/* 'cinwords' */
#endif
#ifdef FEAT_COMMENTS
    char_u	*b_p_com;	/* 'comments' */
#endif
#ifdef FEAT_FOLDING
    char_u	*b_p_cms;	/* 'commentstring' */
#endif
#ifdef FEAT_INS_EXPAND
    char_u	*b_p_cpt;	/* 'complete' */
#endif
#ifdef FEAT_COMPL_FUNC
    char_u	*b_p_cfu;	/* 'completefunc' */
    char_u	*b_p_ofu;	/* 'omnifunc' */
#endif
    int		b_p_eol;	/* 'endofline' */
    int		b_p_et;		/* 'expandtab' */
    int		b_p_et_nobin;	/* b_p_et saved for binary mode */
#ifdef FEAT_MBYTE
    char_u	*b_p_fenc;	/* 'fileencoding' */
#endif
    char_u	*b_p_ff;	/* 'fileformat' */
#ifdef FEAT_AUTOCMD
    char_u	*b_p_ft;	/* 'filetype' */
#endif
    char_u	*b_p_fo;	/* 'formatoptions' */
    char_u	*b_p_flp;	/* 'formatlistpat' */
    int		b_p_inf;	/* 'infercase' */
    char_u	*b_p_isk;	/* 'iskeyword' */
#ifdef FEAT_FIND_ID
    char_u	*b_p_def;	/* 'define' local value */
    char_u	*b_p_inc;	/* 'include' */
# ifdef FEAT_EVAL
    char_u	*b_p_inex;	/* 'includeexpr' */
    long_u	b_p_inex_flags;	/* flags for 'includeexpr' */
# endif
#endif
#if defined(FEAT_CINDENT) && defined(FEAT_EVAL)
    char_u	*b_p_inde;	/* 'indentexpr' */
    long_u	b_p_inde_flags;	/* flags for 'indentexpr' */
    char_u	*b_p_indk;	/* 'indentkeys' */
#endif
#if defined(FEAT_EVAL)
    char_u	*b_p_fex;	/* 'formatexpr' */
    long_u	b_p_fex_flags;	/* flags for 'formatexpr' */
#endif
#ifdef FEAT_CRYPT
    char_u	*b_p_key;	/* 'key' */
#endif
    char_u	*b_p_kp;	/* 'keywordprg' */
#ifdef FEAT_LISP
    int		b_p_lisp;	/* 'lisp' */
#endif
    char_u	*b_p_mps;	/* 'matchpairs' */
    int		b_p_ml;		/* 'modeline' */
    int		b_p_ml_nobin;	/* b_p_ml saved for binary mode */
    int		b_p_ma;		/* 'modifiable' */
    char_u	*b_p_nf;	/* 'nrformats' */
    int		b_p_pi;		/* 'preserveindent' */
#ifdef FEAT_TEXTOBJ
    char_u	*b_p_qe;	/* 'quoteescape' */
#endif
    int		b_p_ro;		/* 'readonly' */
    long	b_p_sw;		/* 'shiftwidth' */
#ifndef SHORT_FNAME
    int		b_p_sn;		/* 'shortname' */
#endif
#ifdef FEAT_SMARTINDENT
    int		b_p_si;		/* 'smartindent' */
#endif
    long	b_p_sts;	/* 'softtabstop' */
    long	b_p_sts_nopaste; /* b_p_sts saved for paste mode */
#ifdef FEAT_SEARCHPATH
    char_u	*b_p_sua;	/* 'suffixesadd' */
#endif
    int		b_p_swf;	/* 'swapfile' */
#ifdef FEAT_SYN_HL
    long	b_p_smc;	/* 'synmaxcol' */
    char_u	*b_p_syn;	/* 'syntax' */
#endif
    long	b_p_ts;		/* 'tabstop' */
    int		b_p_tx;		/* 'textmode' */
    long	b_p_tw;		/* 'textwidth' */
    long	b_p_tw_nobin;	/* b_p_tw saved for binary mode */
    long	b_p_tw_nopaste;	/* b_p_tw saved for paste mode */
    long	b_p_wm;		/* 'wrapmargin' */
    long	b_p_wm_nobin;	/* b_p_wm saved for binary mode */
    long	b_p_wm_nopaste;	/* b_p_wm saved for paste mode */
#ifdef FEAT_KEYMAP
    char_u	*b_p_keymap;	/* 'keymap' */
#endif

    /* local values for options which are normally global */
#ifdef FEAT_QUICKFIX
    char_u	*b_p_gp;	/* 'grepprg' local value */
    char_u	*b_p_mp;	/* 'makeprg' local value */
    char_u	*b_p_efm;	/* 'errorformat' local value */
#endif
    char_u	*b_p_ep;	/* 'equalprg' local value */
    char_u	*b_p_path;	/* 'path' local value */
    int		b_p_ar;		/* 'autoread' local value */
    char_u	*b_p_tags;	/* 'tags' local value */
#ifdef FEAT_INS_EXPAND
    char_u	*b_p_dict;	/* 'dictionary' local value */
    char_u	*b_p_tsr;	/* 'thesaurus' local value */
#endif
#ifdef FEAT_PERSISTENT_UNDO
    int		b_p_udf;	/* 'undofile' */
#endif

    /* end of buffer options */

    linenr_T	b_no_eol_lnum;	/* non-zero lnum when last line of next binary
				 * write should not have an end-of-line */

    int		b_start_eol;	/* last line had eol when it was read */
    int		b_start_ffc;	/* first char of 'ff' when edit started */
#ifdef FEAT_MBYTE
    char_u	*b_start_fenc;	/* 'fileencoding' when edit started or NULL */
    int		b_bad_char;	/* "++bad=" argument when edit started or 0 */
    int		b_start_bomb;	/* 'bomb' when it was read */
#endif

#ifdef FEAT_EVAL
    dictitem_T	b_bufvar;	/* variable for "b:" Dictionary */
    dict_T	*b_vars;	/* internal variables, local to buffer */
#endif

#if defined(FEAT_BEVAL) && defined(FEAT_EVAL)
    char_u	*b_p_bexpr;	/* 'balloonexpr' local value */
    long_u	b_p_bexpr_flags;/* flags for 'balloonexpr' */
#endif
#ifdef FEAT_CRYPT
    char_u	*b_p_cm;	/* 'cryptmethod' */
#endif

    /* When a buffer is created, it starts without a swap file.  b_may_swap is
     * then set to indicate that a swap file may be opened later.  It is reset
     * if a swap file could not be opened.
     */
    int		b_may_swap;
    int		b_did_warn;	/* Set to 1 if user has been warned on first
				   change of a read-only file */

    /* Two special kinds of buffers:
     * help buffer  - used for help files, won't use a swap file.
     * spell buffer - used for spell info, never displayed and doesn't have a
     *		      file name.
     */
    int		b_help;		/* TRUE for help file buffer (when set b_p_bt
				   is "help") */
#ifdef FEAT_SPELL
    int		b_spell;	/* TRUE for a spell file buffer, most fields
				   are not used!  Use the B_SPELL macro to
				   access b_spell without #ifdef. */
#endif

#ifndef SHORT_FNAME
    int		b_shortname;	/* this file has an 8.3 file name */
#endif

#ifdef FEAT_MZSCHEME
    void	*b_mzscheme_ref; /* The MzScheme reference to this buffer */
#endif

#ifdef FEAT_PERL
    void	*b_perl_private;
#endif

#ifdef FEAT_PYTHON
    void	*b_python_ref;	/* The Python reference to this buffer */
#endif

#ifdef FEAT_PYTHON3
    void	*b_python3_ref;	/* The Python3 reference to this buffer */
#endif

#ifdef FEAT_TCL
    void	*b_tcl_ref;
#endif

#ifdef FEAT_RUBY
    void	*b_ruby_ref;
#endif

#if defined(FEAT_SYN_HL) || defined(FEAT_SPELL)
    synblock_T	b_s;		/* Info related to syntax highlighting.  w_s
				 * normally points to this, but some windows
				 * may use a different synblock_T. */
#endif

#ifdef FEAT_SIGNS
    signlist_T	*b_signlist;	/* list of signs to draw */
#endif

#ifdef FEAT_NETBEANS_INTG
    int		b_netbeans_file;    /* TRUE when buffer is owned by NetBeans */
    int		b_was_netbeans_file;/* TRUE if b_netbeans_file was once set */
#endif

};


#ifdef FEAT_DIFF
/*
 * Stuff for diff mode.
 */
# define DB_COUNT 4	/* up to four buffers can be diff'ed */

/*
 * Each diffblock defines where a block of lines starts in each of the buffers
 * and how many lines it occupies in that buffer.  When the lines are missing
 * in the buffer the df_count[] is zero.  This is all counted in
 * buffer lines.
 * There is always at least one unchanged line in between the diffs.
 * Otherwise it would have been included in the diff above or below it.
 * df_lnum[] + df_count[] is the lnum below the change.  When in one buffer
 * lines have been inserted, in the other buffer df_lnum[] is the line below
 * the insertion and df_count[] is zero.  When appending lines at the end of
 * the buffer, df_lnum[] is one beyond the end!
 * This is using a linked list, because the number of differences is expected
 * to be reasonable small.  The list is sorted on lnum.
 */
typedef struct diffblock_S diff_T;
struct diffblock_S
{
    diff_T	*df_next;
    linenr_T	df_lnum[DB_COUNT];	/* line number in buffer */
    linenr_T	df_count[DB_COUNT];	/* nr of inserted/changed lines */
};
#endif

#define SNAP_HELP_IDX	0
#ifdef FEAT_AUTOCMD
# define SNAP_AUCMD_IDX 1
# define SNAP_COUNT	2
#else
# define SNAP_COUNT	1
#endif

/*
 * Tab pages point to the top frame of each tab page.
 * Note: Most values are NOT valid for the current tab page!  Use "curwin",
 * "firstwin", etc. for that.  "tp_topframe" is always valid and can be
 * compared against "topframe" to find the current tab page.
 */
typedef struct tabpage_S tabpage_T;
struct tabpage_S
{
    tabpage_T	    *tp_next;	    /* next tabpage or NULL */
    frame_T	    *tp_topframe;   /* topframe for the windows */
    win_T	    *tp_curwin;	    /* current window in this Tab page */
    win_T	    *tp_prevwin;    /* previous window in this Tab page */
    win_T	    *tp_firstwin;   /* first window in this Tab page */
    win_T	    *tp_lastwin;    /* last window in this Tab page */
    long	    tp_old_Rows;    /* Rows when Tab page was left */
    long	    tp_old_Columns; /* Columns when Tab page was left */
    long	    tp_ch_used;	    /* value of 'cmdheight' when frame size
				       was set */
#ifdef FEAT_GUI
    int		    tp_prev_which_scrollbars[3];
				    /* previous value of which_scrollbars */
#endif
#ifdef FEAT_DIFF
    diff_T	    *tp_first_diff;
    buf_T	    *(tp_diffbuf[DB_COUNT]);
    int		    tp_diff_invalid;	/* list of diffs is outdated */
#endif
    frame_T	    *(tp_snapshot[SNAP_COUNT]);  /* window layout snapshots */
#ifdef FEAT_EVAL
    dictitem_T	    tp_winvar;	    /* variable for "t:" Dictionary */
    dict_T	    *tp_vars;	    /* internal variables, local to tab page */
#endif

#ifdef FEAT_PYTHON
    void	    *tp_python_ref;	/* The Python value for this tab page */
#endif

#ifdef FEAT_PYTHON3
    void	    *tp_python3_ref;	/* The Python value for this tab page */
#endif
};

/*
 * Structure to cache info for displayed lines in w_lines[].
 * Each logical line has one entry.
 * The entry tells how the logical line is currently displayed in the window.
 * This is updated when displaying the window.
 * When the display is changed (e.g., when clearing the screen) w_lines_valid
 * is changed to exclude invalid entries.
 * When making changes to the buffer, wl_valid is reset to indicate wl_size
 * may not reflect what is actually in the buffer.  When wl_valid is FALSE,
 * the entries can only be used to count the number of displayed lines used.
 * wl_lnum and wl_lastlnum are invalid too.
 */
typedef struct w_line
{
    linenr_T	wl_lnum;	/* buffer line number for logical line */
    short_u	wl_size;	/* height in screen lines */
    char	wl_valid;	/* TRUE values are valid for text in buffer */
#ifdef FEAT_FOLDING
    char	wl_folded;	/* TRUE when this is a range of folded lines */
    linenr_T	wl_lastlnum;	/* last buffer line number for logical line */
#endif
} wline_T;

/*
 * Windows are kept in a tree of frames.  Each frame has a column (FR_COL)
 * or row (FR_ROW) layout or is a leaf, which has a window.
 */
struct frame_S
{
    char	fr_layout;	/* FR_LEAF, FR_COL or FR_ROW */
#ifdef FEAT_VERTSPLIT
    int		fr_width;
    int		fr_newwidth;	/* new width used in win_equal_rec() */
#endif
    int		fr_height;
    int		fr_newheight;	/* new height used in win_equal_rec() */
    frame_T	*fr_parent;	/* containing frame or NULL */
    frame_T	*fr_next;	/* frame right or below in same parent, NULL
				   for first */
    frame_T	*fr_prev;	/* frame left or above in same parent, NULL
				   for last */
    /* fr_child and fr_win are mutually exclusive */
    frame_T	*fr_child;	/* first contained frame */
    win_T	*fr_win;	/* window that fills this frame */
};

#define FR_LEAF	0	/* frame is a leaf */
#define FR_ROW	1	/* frame with a row of windows */
#define FR_COL	2	/* frame with a column of windows */

/*
 * Struct used for highlighting 'hlsearch' matches, matches defined by
 * ":match" and matches defined by match functions.
 * For 'hlsearch' there is one pattern for all windows.  For ":match" and the
 * match functions there is a different pattern for each window.
 */
typedef struct
{
    regmmatch_T	rm;	/* points to the regexp program; contains last found
			   match (may continue in next line) */
    buf_T	*buf;	/* the buffer to search for a match */
    linenr_T	lnum;	/* the line to search for a match */
    int		attr;	/* attributes to be used for a match */
    int		attr_cur; /* attributes currently active in win_line() */
    linenr_T	first_lnum;	/* first lnum to search for multi-line pat */
    colnr_T	startcol; /* in win_line() points to char where HL starts */
    colnr_T	endcol;	 /* in win_line() points to char where HL ends */
#ifdef FEAT_RELTIME
    proftime_T	tm;	/* for a time limit */
#endif
} match_T;

/*
 * matchitem_T provides a linked list for storing match items for ":match" and
 * the match functions.
 */
typedef struct matchitem matchitem_T;
struct matchitem
{
    matchitem_T	*next;
    int		id;	    /* match ID */
    int		priority;   /* match priority */
    char_u	*pattern;   /* pattern to highlight */
    int		hlg_id;	    /* highlight group ID */
    regmmatch_T	match;	    /* regexp program for pattern */
    match_T	hl;	    /* struct for doing the actual highlighting */
};

/*
 * Structure which contains all information that belongs to a window
 *
 * All row numbers are relative to the start of the window, except w_winrow.
 */
struct window_S
{
    buf_T	*w_buffer;	    /* buffer we are a window into (used
				       often, keep it the first item!) */

#if defined(FEAT_SYN_HL) || defined(FEAT_SPELL)
    synblock_T	*w_s;		    /* for :ownsyntax */
#endif

#ifdef FEAT_WINDOWS
    win_T	*w_prev;	    /* link to previous window */
    win_T	*w_next;	    /* link to next window */
#endif
#ifdef FEAT_AUTOCMD
    int		w_closing;	    /* window is being closed, don't let
				       autocommands close it too. */
#endif

    frame_T	*w_frame;	    /* frame containing this window */

    pos_T	w_cursor;	    /* cursor position in buffer */

    colnr_T	w_curswant;	    /* The column we'd like to be at.  This is
				       used to try to stay in the same column
				       for up/down cursor motions. */

    int		w_set_curswant;	    /* If set, then update w_curswant the next
				       time through cursupdate() to the
				       current virtual column */

#ifdef FEAT_VISUAL
    /*
     * the next six are used to update the visual part
     */
    char	w_old_visual_mode;  /* last known VIsual_mode */
    linenr_T	w_old_cursor_lnum;  /* last known end of visual part */
    colnr_T	w_old_cursor_fcol;  /* first column for block visual part */
    colnr_T	w_old_cursor_lcol;  /* last column for block visual part */
    linenr_T	w_old_visual_lnum;  /* last known start of visual part */
    colnr_T	w_old_visual_col;   /* last known start of visual part */
    colnr_T	w_old_curswant;	    /* last known value of Curswant */
#endif

    /*
     * "w_topline", "w_leftcol" and "w_skipcol" specify the offsets for
     * displaying the buffer.
     */
    linenr_T	w_topline;	    /* buffer line number of the line at the
				       top of the window */
#ifdef FEAT_AUTOCMD
    char	w_topline_was_set;  /* flag set to TRUE when topline is set,
				       e.g. by winrestview() */
#endif
#ifdef FEAT_DIFF
    int		w_topfill;	    /* number of filler lines above w_topline */
    int		w_old_topfill;	    /* w_topfill at last redraw */
    int		w_botfill;	    /* TRUE when filler lines are actually
				       below w_topline (at end of file) */
    int		w_old_botfill;	    /* w_botfill at last redraw */
#endif
    colnr_T	w_leftcol;	    /* window column number of the left most
				       character in the window; used when
				       'wrap' is off */
    colnr_T	w_skipcol;	    /* starting column when a single line
				       doesn't fit in the window */

    /*
     * Layout of the window in the screen.
     * May need to add "msg_scrolled" to "w_winrow" in rare situations.
     */
#ifdef FEAT_WINDOWS
    int		w_winrow;	    /* first row of window in screen */
#endif
    int		w_height;	    /* number of rows in window, excluding
				       status/command line(s) */
#ifdef FEAT_WINDOWS
    int		w_status_height;    /* number of status lines (0 or 1) */
#endif
#ifdef FEAT_VERTSPLIT
    int		w_wincol;	    /* Leftmost column of window in screen.
				       use W_WINCOL() */
    int		w_width;	    /* Width of window, excluding separation.
				       use W_WIDTH() */
    int		w_vsep_width;	    /* Number of separator columns (0 or 1).
				       use W_VSEP_WIDTH() */
#endif

    /*
     * === start of cached values ====
     */
    /*
     * Recomputing is minimized by storing the result of computations.
     * Use functions in screen.c to check if they are valid and to update.
     * w_valid is a bitfield of flags, which indicate if specific values are
     * valid or need to be recomputed.	See screen.c for values.
     */
    int		w_valid;
    pos_T	w_valid_cursor;	    /* last known position of w_cursor, used
				       to adjust w_valid */
    colnr_T	w_valid_leftcol;    /* last known w_leftcol */

    /*
     * w_cline_height is the number of physical lines taken by the buffer line
     * that the cursor is on.  We use this to avoid extra calls to plines().
     */
    int		w_cline_height;	    /* current size of cursor line */
#ifdef FEAT_FOLDING
    int		w_cline_folded;	    /* cursor line is folded */
#endif

    int		w_cline_row;	    /* starting row of the cursor line */

    colnr_T	w_virtcol;	    /* column number of the cursor in the
				       buffer line, as opposed to the column
				       number we're at on the screen.  This
				       makes a difference on lines which span
				       more than one screen line or when
				       w_leftcol is non-zero */

    /*
     * w_wrow and w_wcol specify the cursor position in the window.
     * This is related to positions in the window, not in the display or
     * buffer, thus w_wrow is relative to w_winrow.
     */
    int		w_wrow, w_wcol;	    /* cursor position in window */

    linenr_T	w_botline;	    /* number of the line below the bottom of
				       the screen */
    int		w_empty_rows;	    /* number of ~ rows in window */
#ifdef FEAT_DIFF
    int		w_filler_rows;	    /* number of filler rows at the end of the
				       window */
#endif

    /*
     * Info about the lines currently in the window is remembered to avoid
     * recomputing it every time.  The allocated size of w_lines[] is Rows.
     * Only the w_lines_valid entries are actually valid.
     * When the display is up-to-date w_lines[0].wl_lnum is equal to w_topline
     * and w_lines[w_lines_valid - 1].wl_lnum is equal to w_botline.
     * Between changing text and updating the display w_lines[] represents
     * what is currently displayed.  wl_valid is reset to indicated this.
     * This is used for efficient redrawing.
     */
    int		w_lines_valid;	    /* number of valid entries */
    wline_T	*w_lines;

#ifdef FEAT_FOLDING
    garray_T	w_folds;	    /* array of nested folds */
    char	w_fold_manual;	    /* when TRUE: some folds are opened/closed
				       manually */
    char	w_foldinvalid;	    /* when TRUE: folding needs to be
				       recomputed */
#endif
#ifdef FEAT_LINEBREAK
    int		w_nrwidth;	    /* width of 'number' and 'relativenumber'
				       column being used */
#endif

    /*
     * === end of cached values ===
     */

    int		w_redr_type;	    /* type of redraw to be performed on win */
    int		w_upd_rows;	    /* number of window lines to update when
				       w_redr_type is REDRAW_TOP */
    linenr_T	w_redraw_top;	    /* when != 0: first line needing redraw */
    linenr_T	w_redraw_bot;	    /* when != 0: last line needing redraw */
#ifdef FEAT_WINDOWS
    int		w_redr_status;	    /* if TRUE status line must be redrawn */
#endif

#ifdef FEAT_CMDL_INFO
    /* remember what is shown in the ruler for this window (if 'ruler' set) */
    pos_T	w_ru_cursor;	    /* cursor position shown in ruler */
    colnr_T	w_ru_virtcol;	    /* virtcol shown in ruler */
    linenr_T	w_ru_topline;	    /* topline shown in ruler */
    linenr_T	w_ru_line_count;    /* line count used for ruler */
# ifdef FEAT_DIFF
    int		w_ru_topfill;	    /* topfill shown in ruler */
# endif
    char	w_ru_empty;	    /* TRUE if ruler shows 0-1 (empty line) */
#endif

    int		w_alt_fnum;	    /* alternate file (for # and CTRL-^) */

#ifdef FEAT_WINDOWS
    alist_T	*w_alist;	    /* pointer to arglist for this window */
#endif
    int		w_arg_idx;	    /* current index in argument list (can be
				       out of range!) */
    int		w_arg_idx_invalid;  /* editing another file than w_arg_idx */

    char_u	*w_localdir;	    /* absolute path of local directory or
				       NULL */
    /*
     * Options local to a window.
     * They are local because they influence the layout of the window or
     * depend on the window layout.
     * There are two values: w_onebuf_opt is local to the buffer currently in
     * this window, w_allbuf_opt is for all buffers in this window.
     */
    winopt_T	w_onebuf_opt;
    winopt_T	w_allbuf_opt;

    /* A few options have local flags for P_INSECURE. */
#ifdef FEAT_STL_OPT
    long_u	w_p_stl_flags;	    /* flags for 'statusline' */
#endif
#ifdef FEAT_EVAL
    long_u	w_p_fde_flags;	    /* flags for 'foldexpr' */
    long_u	w_p_fdt_flags;	    /* flags for 'foldtext' */
#endif
#ifdef FEAT_SYN_HL
    int		*w_p_cc_cols;	    /* array of columns to highlight or NULL */
#endif

    /* transform a pointer to a "onebuf" option into a "allbuf" option */
#define GLOBAL_WO(p)	((char *)p + sizeof(winopt_T))

#ifdef FEAT_SCROLLBIND
    long	w_scbind_pos;
#endif

#ifdef FEAT_EVAL
    dictitem_T	w_winvar;	/* variable for "w:" Dictionary */
    dict_T	*w_vars;	/* internal variables, local to window */
#endif

#if defined(FEAT_RIGHTLEFT) && defined(FEAT_FKMAP)
    int		w_farsi;	/* for the window dependent Farsi functions */
#endif

    /*
     * The w_prev_pcmark field is used to check whether we really did jump to
     * a new line after setting the w_pcmark.  If not, then we revert to
     * using the previous w_pcmark.
     */
    pos_T	w_pcmark;	/* previous context mark */
    pos_T	w_prev_pcmark;	/* previous w_pcmark */

#ifdef FEAT_JUMPLIST
    /*
     * the jumplist contains old cursor positions
     */
    xfmark_T	w_jumplist[JUMPLISTSIZE];
    int		w_jumplistlen;		/* number of active entries */
    int		w_jumplistidx;		/* current position */

    int		w_changelistidx;	/* current position in b_changelist */
#endif

#ifdef FEAT_SEARCH_EXTRA
    matchitem_T	*w_match_head;		/* head of match list */
    int		w_next_match_id;	/* next match ID */
#endif

    /*
     * the tagstack grows from 0 upwards:
     * entry 0: older
     * entry 1: newer
     * entry 2: newest
     */
    taggy_T	w_tagstack[TAGSTACKSIZE];	/* the tag stack */
    int		w_tagstackidx;		/* idx just below active entry */
    int		w_tagstacklen;		/* number of tags on stack */

    /*
     * w_fraction is the fractional row of the cursor within the window, from
     * 0 at the top row to FRACTION_MULT at the last row.
     * w_prev_fraction_row was the actual cursor row when w_fraction was last
     * calculated.
     */
    int		w_fraction;
    int		w_prev_fraction_row;

#ifdef FEAT_GUI
    scrollbar_T	w_scrollbars[2];	/* vert. Scrollbars for this window */
#endif
#ifdef FEAT_LINEBREAK
    linenr_T	w_nrwidth_line_count;	/* line count when ml_nrwidth_width
					 * was computed. */
    int		w_nrwidth_width;	/* nr of chars to print line count. */
#endif

#ifdef FEAT_QUICKFIX
    qf_info_T	*w_llist;		/* Location list for this window */
    /*
     * Location list reference used in the location list window.
     * In a non-location list window, w_llist_ref is NULL.
     */
    qf_info_T	*w_llist_ref;
#endif


#ifdef FEAT_MZSCHEME
    void	*w_mzscheme_ref;	/* The MzScheme value for this window */
#endif

#ifdef FEAT_PERL
    void	*w_perl_private;
#endif

#ifdef FEAT_PYTHON
    void	*w_python_ref;		/* The Python value for this window */
#endif

#ifdef FEAT_PYTHON3
    void	*w_python3_ref;		/* The Python value for this window */
#endif

#ifdef FEAT_TCL
    void	*w_tcl_ref;
#endif

#ifdef FEAT_RUBY
    void	*w_ruby_ref;
#endif
};

/*
 * Arguments for operators.
 */
typedef struct oparg_S
{
    int		op_type;	/* current pending operator type */
    int		regname;	/* register to use for the operator */
    int		motion_type;	/* type of the current cursor motion */
    int		motion_force;	/* force motion type: 'v', 'V' or CTRL-V */
    int		use_reg_one;	/* TRUE if delete uses reg 1 even when not
				   linewise */
    int		inclusive;	/* TRUE if char motion is inclusive (only
				   valid when motion_type is MCHAR */
    int		end_adjusted;	/* backuped b_op_end one char (only used by
				   do_format()) */
    pos_T	start;		/* start of the operator */
    pos_T	end;		/* end of the operator */
    pos_T	cursor_start;	/* cursor position before motion for "gw" */

    long	line_count;	/* number of lines from op_start to op_end
				   (inclusive) */
    int		empty;		/* op_start and op_end the same (only used by
				   do_change()) */
#ifdef FEAT_VISUAL
    int		is_VIsual;	/* operator on Visual area */
    int		block_mode;	/* current operator is Visual block mode */
#endif
    colnr_T	start_vcol;	/* start col for block mode operator */
    colnr_T	end_vcol;	/* end col for block mode operator */
#ifdef FEAT_AUTOCMD
    long	prev_opcount;	/* ca.opcount saved for K_CURSORHOLD */
    long	prev_count0;	/* ca.count0 saved for K_CURSORHOLD */
#endif
} oparg_T;

/*
 * Arguments for Normal mode commands.
 */
typedef struct cmdarg_S
{
    oparg_T	*oap;		/* Operator arguments */
    int		prechar;	/* prefix character (optional, always 'g') */
    int		cmdchar;	/* command character */
    int		nchar;		/* next command character (optional) */
#ifdef FEAT_MBYTE
    int		ncharC1;	/* first composing character (optional) */
    int		ncharC2;	/* second composing character (optional) */
#endif
    int		extra_char;	/* yet another character (optional) */
    long	opcount;	/* count before an operator */
    long	count0;		/* count before command, default 0 */
    long	count1;		/* count before command, default 1 */
    int		arg;		/* extra argument from nv_cmds[] */
    int		retval;		/* return: CA_* values */
    char_u	*searchbuf;	/* return: pointer to search pattern or NULL */
} cmdarg_T;

/* values for retval: */
#define CA_COMMAND_BUSY	    1	/* skip restarting edit() once */
#define CA_NO_ADJ_OP_END    2	/* don't adjust operator end */

#ifdef CURSOR_SHAPE
/*
 * struct to store values from 'guicursor' and 'mouseshape'
 */
/* Indexes in shape_table[] */
#define SHAPE_IDX_N	0	/* Normal mode */
#define SHAPE_IDX_V	1	/* Visual mode */
#define SHAPE_IDX_I	2	/* Insert mode */
#define SHAPE_IDX_R	3	/* Replace mode */
#define SHAPE_IDX_C	4	/* Command line Normal mode */
#define SHAPE_IDX_CI	5	/* Command line Insert mode */
#define SHAPE_IDX_CR	6	/* Command line Replace mode */
#define SHAPE_IDX_O	7	/* Operator-pending mode */
#define SHAPE_IDX_VE	8	/* Visual mode with 'selection' exclusive */
#define SHAPE_IDX_CLINE	9	/* On command line */
#define SHAPE_IDX_STATUS 10	/* A status line */
#define SHAPE_IDX_SDRAG 11	/* dragging a status line */
#define SHAPE_IDX_VSEP	12	/* A vertical separator line */
#define SHAPE_IDX_VDRAG 13	/* dragging a vertical separator line */
#define SHAPE_IDX_MORE	14	/* Hit-return or More */
#define SHAPE_IDX_MOREL	15	/* Hit-return or More in last line */
#define SHAPE_IDX_SM	16	/* showing matching paren */
#define SHAPE_IDX_COUNT	17

#define SHAPE_BLOCK	0	/* block cursor */
#define SHAPE_HOR	1	/* horizontal bar cursor */
#define SHAPE_VER	2	/* vertical bar cursor */

#define MSHAPE_NUMBERED	1000	/* offset for shapes identified by number */
#define MSHAPE_HIDE	1	/* hide mouse pointer */

#define SHAPE_MOUSE	1	/* used for mouse pointer shape */
#define SHAPE_CURSOR	2	/* used for text cursor shape */

typedef struct cursor_entry
{
    int		shape;		/* one of the SHAPE_ defines */
    int		mshape;		/* one of the MSHAPE defines */
    int		percentage;	/* percentage of cell for bar */
    long	blinkwait;	/* blinking, wait time before blinking starts */
    long	blinkon;	/* blinking, on time */
    long	blinkoff;	/* blinking, off time */
    int		id;		/* highlight group ID */
    int		id_lm;		/* highlight group ID for :lmap mode */
    char	*name;		/* mode name (fixed) */
    char	used_for;	/* SHAPE_MOUSE and/or SHAPE_CURSOR */
} cursorentry_T;
#endif /* CURSOR_SHAPE */

#ifdef FEAT_MENU

/* Indices into vimmenu_T->strings[] and vimmenu_T->noremap[] for each mode */
#define MENU_INDEX_INVALID	-1
#define MENU_INDEX_NORMAL	0
#define MENU_INDEX_VISUAL	1
#define MENU_INDEX_SELECT	2
#define MENU_INDEX_OP_PENDING	3
#define MENU_INDEX_INSERT	4
#define MENU_INDEX_CMDLINE	5
#define MENU_INDEX_TIP		6
#define MENU_MODES		7

/* Menu modes */
#define MENU_NORMAL_MODE	(1 << MENU_INDEX_NORMAL)
#define MENU_VISUAL_MODE	(1 << MENU_INDEX_VISUAL)
#define MENU_SELECT_MODE	(1 << MENU_INDEX_SELECT)
#define MENU_OP_PENDING_MODE	(1 << MENU_INDEX_OP_PENDING)
#define MENU_INSERT_MODE	(1 << MENU_INDEX_INSERT)
#define MENU_CMDLINE_MODE	(1 << MENU_INDEX_CMDLINE)
#define MENU_TIP_MODE		(1 << MENU_INDEX_TIP)
#define MENU_ALL_MODES		((1 << MENU_INDEX_TIP) - 1)
/*note MENU_INDEX_TIP is not a 'real' mode*/

/* Start a menu name with this to not include it on the main menu bar */
#define MNU_HIDDEN_CHAR		']'

typedef struct VimMenu vimmenu_T;

struct VimMenu
{
    int		modes;		    /* Which modes is this menu visible for? */
    int		enabled;	    /* for which modes the menu is enabled */
    char_u	*name;		    /* Name of menu, possibly translated */
    char_u	*dname;		    /* Displayed Name ("name" without '&') */
#ifdef FEAT_MULTI_LANG
    char_u	*en_name;	    /* "name" untranslated, NULL when "name"
				     * was not translated */
    char_u	*en_dname;	    /* "dname" untranslated, NULL when "dname"
				     * was not translated */
#endif
    int		mnemonic;	    /* mnemonic key (after '&') */
    char_u	*actext;	    /* accelerator text (after TAB) */
    int		priority;	    /* Menu order priority */
#ifdef FEAT_GUI
    void	(*cb) __ARGS((vimmenu_T *));	    /* Call-back routine */
#endif
#ifdef FEAT_TOOLBAR
    char_u	*iconfile;	    /* name of file for icon or NULL */
    int		iconidx;	    /* icon index (-1 if not set) */
    int		icon_builtin;	    /* icon names is BuiltIn{nr} */
#endif
    char_u	*strings[MENU_MODES]; /* Mapped string for each mode */
    int		noremap[MENU_MODES]; /* A REMAP_ flag for each mode */
    char	silent[MENU_MODES]; /* A silent flag for each mode */
    vimmenu_T	*children;	    /* Children of sub-menu */
    vimmenu_T	*parent;	    /* Parent of menu */
    vimmenu_T	*next;		    /* Next item in menu */
#ifdef FEAT_GUI_X11
    Widget	id;		    /* Manage this to enable item */
    Widget	submenu_id;	    /* If this is submenu, add children here */
#endif
#ifdef FEAT_GUI_GTK
    GtkWidget	*id;		    /* Manage this to enable item */
    GtkWidget	*submenu_id;	    /* If this is submenu, add children here */
    GtkWidget	*tearoff_handle;
    GtkWidget   *label;		    /* Used by "set wak=" code. */
#endif
#ifdef FEAT_GUI_MOTIF
    int		sensitive;	    /* turn button on/off */
    char	**xpm;		    /* pixmap data */
    char	*xpm_fname;	    /* file with pixmap data */
#endif
#ifdef FEAT_GUI_ATHENA
    Pixmap	image;		    /* Toolbar image */
#endif
#ifdef FEAT_BEVAL_TIP
    BalloonEval *tip;		    /* tooltip for this menu item */
#endif
#ifdef FEAT_GUI_W16
    UINT	id;		    /* Id of menu item */
    HMENU	submenu_id;	    /* If this is submenu, add children here */
#endif
#ifdef FEAT_GUI_W32
    UINT	id;		    /* Id of menu item */
    HMENU	submenu_id;	    /* If this is submenu, add children here */
    HWND	tearoff_handle;	    /* hWnd of tearoff if created */
#endif
#ifdef FEAT_GUI_MAC
/*  MenuHandle	id; */
/*  short	index;	*/	    /* the item index within the father menu */
    short	menu_id;	    /* the menu id to which this item belong */
    short	submenu_id;	    /* the menu id of the children (could be
				       get through some tricks) */
    MenuHandle	menu_handle;
    MenuHandle	submenu_handle;
#endif
#ifdef FEAT_GUI_PHOTON
    PtWidget_t	*id;
    PtWidget_t	*submenu_id;
#endif
};
#else
/* For generating prototypes when FEAT_MENU isn't defined. */
typedef int vimmenu_T;

#endif /* FEAT_MENU */

/*
 * Struct to save values in before executing autocommands for a buffer that is
 * not the current buffer.  Without FEAT_AUTOCMD only "curbuf" is remembered.
 */
typedef struct
{
    buf_T	*save_curbuf;	/* saved curbuf */
#ifdef FEAT_AUTOCMD
    int		use_aucmd_win;	/* using aucmd_win */
    win_T	*save_curwin;	/* saved curwin */
    win_T	*new_curwin;	/* new curwin */
    buf_T	*new_curbuf;	/* new curbuf */
    char_u	*globaldir;	/* saved value of globaldir */
#endif
} aco_save_T;

/*
 * Generic option table item, only used for printer at the moment.
 */
typedef struct
{
    const char	*name;
    int		hasnum;
    long	number;
    char_u	*string;	/* points into option string */
    int		strlen;
    int		present;
} option_table_T;

/*
 * Structure to hold printing color and font attributes.
 */
typedef struct
{
    long_u	fg_color;
    long_u	bg_color;
    int		bold;
    int		italic;
    int		underline;
    int		undercurl;
} prt_text_attr_T;

/*
 * Structure passed back to the generic printer code.
 */
typedef struct
{
    int		n_collated_copies;
    int		n_uncollated_copies;
    int		duplex;
    int		chars_per_line;
    int		lines_per_page;
    int		has_color;
    prt_text_attr_T number;
#ifdef FEAT_SYN_HL
    int		modec;
    int		do_syntax;
#endif
    int		user_abort;
    char_u	*jobname;
#ifdef FEAT_POSTSCRIPT
    char_u	*outfile;
    char_u	*arguments;
#endif
} prt_settings_T;

#define PRINT_NUMBER_WIDTH 8

/*
 * Used for popup menu items.
 */
typedef struct
{
    char_u	*pum_text;	/* main menu text */
    char_u	*pum_kind;	/* extra kind text (may be truncated) */
    char_u	*pum_extra;	/* extra menu text (may be truncated) */
    char_u	*pum_info;	/* extra info */
} pumitem_T;

/*
 * Structure used for get_tagfname().
 */
typedef struct
{
    char_u	*tn_tags;	/* value of 'tags' when starting */
    char_u	*tn_np;		/* current position in tn_tags */
    int		tn_did_filefind_init;
    int		tn_hf_idx;
    void	*tn_search_ctx;
} tagname_T;

/*
 * Array indexes used for cptext argument of ins_compl_add().
 */
#define CPT_ABBR    0	/* "abbr" */
#define CPT_MENU    1	/* "menu" */
#define CPT_KIND    2	/* "kind" */
#define CPT_INFO    3	/* "info" */
#define CPT_COUNT   4	/* Number of entries */

typedef struct {
  UINT32_T total[2];
  UINT32_T state[8];
  char_u   buffer[64];
} context_sha256_T;