diff --git a/src/spellfile.c b/src/spellfile.c
new file mode 100644
index 0000000..7814979
--- /dev/null
+++ b/src/spellfile.c
@@ -0,0 +1,6749 @@
+/* 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.
+ */
+
+/*
+ * spellfile.c: code for reading and writing spell files.
+ *
+ * See spell.c for information about spell checking.
+ */
+
+/*
+ * Vim spell file format: <HEADER>
+ *			  <SECTIONS>
+ *			  <LWORDTREE>
+ *			  <KWORDTREE>
+ *			  <PREFIXTREE>
+ *
+ * <HEADER>: <fileID> <versionnr>
+ *
+ * <fileID>     8 bytes    "VIMspell"
+ * <versionnr>  1 byte	    VIMSPELLVERSION
+ *
+ *
+ * Sections make it possible to add information to the .spl file without
+ * making it incompatible with previous versions.  There are two kinds of
+ * sections:
+ * 1. Not essential for correct spell checking.  E.g. for making suggestions.
+ *    These are skipped when not supported.
+ * 2. Optional information, but essential for spell checking when present.
+ *    E.g. conditions for affixes.  When this section is present but not
+ *    supported an error message is given.
+ *
+ * <SECTIONS>: <section> ... <sectionend>
+ *
+ * <section>: <sectionID> <sectionflags> <sectionlen> (section contents)
+ *
+ * <sectionID>	  1 byte    number from 0 to 254 identifying the section
+ *
+ * <sectionflags> 1 byte    SNF_REQUIRED: this section is required for correct
+ *					    spell checking
+ *
+ * <sectionlen>   4 bytes   length of section contents, MSB first
+ *
+ * <sectionend>	  1 byte    SN_END
+ *
+ *
+ * sectionID == SN_INFO: <infotext>
+ * <infotext>	 N bytes    free format text with spell file info (version,
+ *			    website, etc)
+ *
+ * sectionID == SN_REGION: <regionname> ...
+ * <regionname>	 2 bytes    Up to 8 region names: ca, au, etc.  Lower case.
+ *			    First <regionname> is region 1.
+ *
+ * sectionID == SN_CHARFLAGS: <charflagslen> <charflags>
+ *				<folcharslen> <folchars>
+ * <charflagslen> 1 byte    Number of bytes in <charflags> (should be 128).
+ * <charflags>  N bytes     List of flags (first one is for character 128):
+ *			    0x01  word character	CF_WORD
+ *			    0x02  upper-case character	CF_UPPER
+ * <folcharslen>  2 bytes   Number of bytes in <folchars>.
+ * <folchars>     N bytes   Folded characters, first one is for character 128.
+ *
+ * sectionID == SN_MIDWORD: <midword>
+ * <midword>     N bytes    Characters that are word characters only when used
+ *			    in the middle of a word.
+ *
+ * sectionID == SN_PREFCOND: <prefcondcnt> <prefcond> ...
+ * <prefcondcnt> 2 bytes    Number of <prefcond> items following.
+ * <prefcond> : <condlen> <condstr>
+ * <condlen>	1 byte	    Length of <condstr>.
+ * <condstr>	N bytes	    Condition for the prefix.
+ *
+ * sectionID == SN_REP: <repcount> <rep> ...
+ * <repcount>	 2 bytes    number of <rep> items, MSB first.
+ * <rep> : <repfromlen> <repfrom> <reptolen> <repto>
+ * <repfromlen>	 1 byte	    length of <repfrom>
+ * <repfrom>	 N bytes    "from" part of replacement
+ * <reptolen>	 1 byte	    length of <repto>
+ * <repto>	 N bytes    "to" part of replacement
+ *
+ * sectionID == SN_REPSAL: <repcount> <rep> ...
+ *   just like SN_REP but for soundfolded words
+ *
+ * sectionID == SN_SAL: <salflags> <salcount> <sal> ...
+ * <salflags>	 1 byte	    flags for soundsalike conversion:
+ *			    SAL_F0LLOWUP
+ *			    SAL_COLLAPSE
+ *			    SAL_REM_ACCENTS
+ * <salcount>    2 bytes    number of <sal> items following
+ * <sal> : <salfromlen> <salfrom> <saltolen> <salto>
+ * <salfromlen>	 1 byte	    length of <salfrom>
+ * <salfrom>	 N bytes    "from" part of soundsalike
+ * <saltolen>	 1 byte	    length of <salto>
+ * <salto>	 N bytes    "to" part of soundsalike
+ *
+ * sectionID == SN_SOFO: <sofofromlen> <sofofrom> <sofotolen> <sofoto>
+ * <sofofromlen> 2 bytes    length of <sofofrom>
+ * <sofofrom>	 N bytes    "from" part of soundfold
+ * <sofotolen>	 2 bytes    length of <sofoto>
+ * <sofoto>	 N bytes    "to" part of soundfold
+ *
+ * sectionID == SN_SUGFILE: <timestamp>
+ * <timestamp>   8 bytes    time in seconds that must match with .sug file
+ *
+ * sectionID == SN_NOSPLITSUGS: nothing
+	 *
+ * sectionID == SN_NOCOMPOUNDSUGS: nothing
+ *
+ * sectionID == SN_WORDS: <word> ...
+ * <word>	 N bytes    NUL terminated common word
+ *
+ * sectionID == SN_MAP: <mapstr>
+ * <mapstr>	 N bytes    String with sequences of similar characters,
+ *			    separated by slashes.
+ *
+ * sectionID == SN_COMPOUND: <compmax> <compminlen> <compsylmax> <compoptions>
+ *				<comppatcount> <comppattern> ... <compflags>
+ * <compmax>     1 byte	    Maximum nr of words in compound word.
+ * <compminlen>  1 byte	    Minimal word length for compounding.
+ * <compsylmax>  1 byte	    Maximum nr of syllables in compound word.
+ * <compoptions> 2 bytes    COMP_ flags.
+ * <comppatcount> 2 bytes   number of <comppattern> following
+ * <compflags>   N bytes    Flags from COMPOUNDRULE items, separated by
+ *			    slashes.
+ *
+ * <comppattern>: <comppatlen> <comppattext>
+ * <comppatlen>	 1 byte	    length of <comppattext>
+ * <comppattext> N bytes    end or begin chars from CHECKCOMPOUNDPATTERN
+ *
+ * sectionID == SN_NOBREAK: (empty, its presence is what matters)
+ *
+ * sectionID == SN_SYLLABLE: <syllable>
+ * <syllable>    N bytes    String from SYLLABLE item.
+ *
+ * <LWORDTREE>: <wordtree>
+ *
+ * <KWORDTREE>: <wordtree>
+ *
+ * <PREFIXTREE>: <wordtree>
+ *
+ *
+ * <wordtree>: <nodecount> <nodedata> ...
+ *
+ * <nodecount>	4 bytes	    Number of nodes following.  MSB first.
+ *
+ * <nodedata>: <siblingcount> <sibling> ...
+ *
+ * <siblingcount> 1 byte    Number of siblings in this node.  The siblings
+ *			    follow in sorted order.
+ *
+ * <sibling>: <byte> [ <nodeidx> <xbyte>
+ *		      | <flags> [<flags2>] [<region>] [<affixID>]
+ *		      | [<pflags>] <affixID> <prefcondnr> ]
+ *
+ * <byte>	1 byte	    Byte value of the sibling.  Special cases:
+ *			    BY_NOFLAGS: End of word without flags and for all
+ *					regions.
+ *					For PREFIXTREE <affixID> and
+ *					<prefcondnr> follow.
+ *			    BY_FLAGS:   End of word, <flags> follow.
+ *					For PREFIXTREE <pflags>, <affixID>
+ *					and <prefcondnr> follow.
+ *			    BY_FLAGS2:  End of word, <flags> and <flags2>
+ *					follow.  Not used in PREFIXTREE.
+ *			    BY_INDEX:   Child of sibling is shared, <nodeidx>
+ *					and <xbyte> follow.
+ *
+ * <nodeidx>	3 bytes	    Index of child for this sibling, MSB first.
+ *
+ * <xbyte>	1 byte	    byte value of the sibling.
+ *
+ * <flags>	1 byte	    bitmask of:
+ *			    WF_ALLCAP	word must have only capitals
+ *			    WF_ONECAP   first char of word must be capital
+ *			    WF_KEEPCAP	keep-case word
+ *			    WF_FIXCAP   keep-case word, all caps not allowed
+ *			    WF_RARE	rare word
+ *			    WF_BANNED	bad word
+ *			    WF_REGION	<region> follows
+ *			    WF_AFX	<affixID> follows
+ *
+ * <flags2>	1 byte	    Bitmask of:
+ *			    WF_HAS_AFF >> 8   word includes affix
+ *			    WF_NEEDCOMP >> 8  word only valid in compound
+ *			    WF_NOSUGGEST >> 8  word not used for suggestions
+ *			    WF_COMPROOT >> 8  word already a compound
+ *			    WF_NOCOMPBEF >> 8 no compounding before this word
+ *			    WF_NOCOMPAFT >> 8 no compounding after this word
+ *
+ * <pflags>	1 byte	    bitmask of:
+ *			    WFP_RARE	rare prefix
+ *			    WFP_NC	non-combining prefix
+ *			    WFP_UP	letter after prefix made upper case
+ *
+ * <region>	1 byte	    Bitmask for regions in which word is valid.  When
+ *			    omitted it's valid in all regions.
+ *			    Lowest bit is for region 1.
+ *
+ * <affixID>	1 byte	    ID of affix that can be used with this word.  In
+ *			    PREFIXTREE used for the required prefix ID.
+ *
+ * <prefcondnr>	2 bytes	    Prefix condition number, index in <prefcond> list
+ *			    from HEADER.
+ *
+ * All text characters are in 'encoding', but stored as single bytes.
+ */
+
+/*
+ * Vim .sug file format:  <SUGHEADER>
+ *			  <SUGWORDTREE>
+ *			  <SUGTABLE>
+ *
+ * <SUGHEADER>: <fileID> <versionnr> <timestamp>
+ *
+ * <fileID>     6 bytes     "VIMsug"
+ * <versionnr>  1 byte      VIMSUGVERSION
+ * <timestamp>  8 bytes     timestamp that must match with .spl file
+ *
+ *
+ * <SUGWORDTREE>: <wordtree>  (see above, no flags or region used)
+ *
+ *
+ * <SUGTABLE>: <sugwcount> <sugline> ...
+ *
+ * <sugwcount>	4 bytes	    number of <sugline> following
+ *
+ * <sugline>: <sugnr> ... NUL
+ *
+ * <sugnr>:     X bytes     word number that results in this soundfolded word,
+ *			    stored as an offset to the previous number in as
+ *			    few bytes as possible, see offset2bytes())
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_SPELL) || defined(PROTO)
+
+#ifndef UNIX		/* it's in os_unix.h for Unix */
+# include <time.h>	/* for time_t */
+#endif
+
+#ifndef UNIX		/* it's in os_unix.h for Unix */
+# include <time.h>	/* for time_t */
+#endif
+
+/* Special byte values for <byte>.  Some are only used in the tree for
+ * postponed prefixes, some only in the other trees.  This is a bit messy... */
+#define BY_NOFLAGS	0	/* end of word without flags or region; for
+				 * postponed prefix: no <pflags> */
+#define BY_INDEX	1	/* child is shared, index follows */
+#define BY_FLAGS	2	/* end of word, <flags> byte follows; for
+				 * postponed prefix: <pflags> follows */
+#define BY_FLAGS2	3	/* end of word, <flags> and <flags2> bytes
+				 * follow; never used in prefix tree */
+#define BY_SPECIAL  BY_FLAGS2	/* highest special byte value */
+
+/* Flags used in .spl file for soundsalike flags. */
+#define SAL_F0LLOWUP		1
+#define SAL_COLLAPSE		2
+#define SAL_REM_ACCENTS		4
+
+#define VIMSPELLMAGIC "VIMspell"  /* string at start of Vim spell file */
+#define VIMSPELLMAGICL 8
+#define VIMSPELLVERSION 50
+
+/* Section IDs.  Only renumber them when VIMSPELLVERSION changes! */
+#define SN_REGION	0	/* <regionname> section */
+#define SN_CHARFLAGS	1	/* charflags section */
+#define SN_MIDWORD	2	/* <midword> section */
+#define SN_PREFCOND	3	/* <prefcond> section */
+#define SN_REP		4	/* REP items section */
+#define SN_SAL		5	/* SAL items section */
+#define SN_SOFO		6	/* soundfolding section */
+#define SN_MAP		7	/* MAP items section */
+#define SN_COMPOUND	8	/* compound words section */
+#define SN_SYLLABLE	9	/* syllable section */
+#define SN_NOBREAK	10	/* NOBREAK section */
+#define SN_SUGFILE	11	/* timestamp for .sug file */
+#define SN_REPSAL	12	/* REPSAL items section */
+#define SN_WORDS	13	/* common words */
+#define SN_NOSPLITSUGS	14	/* don't split word for suggestions */
+#define SN_INFO		15	/* info section */
+#define SN_NOCOMPOUNDSUGS 16	/* don't compound for suggestions */
+#define SN_END		255	/* end of sections */
+
+#define SNF_REQUIRED	1	/* <sectionflags>: required section */
+
+#define CF_WORD		0x01
+#define CF_UPPER	0x02
+
+static int set_spell_finish(spelltab_T	*new_st);
+static int write_spell_prefcond(FILE *fd, garray_T *gap);
+static char_u *read_cnt_string(FILE *fd, int cnt_bytes, int *lenp);
+static int read_region_section(FILE *fd, slang_T *slang, int len);
+static int read_charflags_section(FILE *fd);
+static int read_prefcond_section(FILE *fd, slang_T *lp);
+static int read_rep_section(FILE *fd, garray_T *gap, short *first);
+static int read_sal_section(FILE *fd, slang_T *slang);
+static int read_words_section(FILE *fd, slang_T *lp, int len);
+static int read_sofo_section(FILE *fd, slang_T *slang);
+static int read_compound(FILE *fd, slang_T *slang, int len);
+static int set_sofo(slang_T *lp, char_u *from, char_u *to);
+static void set_sal_first(slang_T *lp);
+#ifdef FEAT_MBYTE
+static int *mb_str2wide(char_u *s);
+#endif
+static int spell_read_tree(FILE *fd, char_u **bytsp, idx_T **idxsp, int prefixtree, int prefixcnt);
+static idx_T read_tree_node(FILE *fd, char_u *byts, idx_T *idxs, int maxidx, idx_T startidx, int prefixtree, int maxprefcondnr);
+static void spell_reload_one(char_u *fname, int added_word);
+static void set_spell_charflags(char_u *flags, int cnt, char_u *upp);
+static int set_spell_chartab(char_u *fol, char_u *low, char_u *upp);
+static void set_map_str(slang_T *lp, char_u *map);
+
+
+static char *e_spell_trunc = N_("E758: Truncated spell file");
+static char *e_afftrailing = N_("Trailing text in %s line %d: %s");
+static char *e_affname = N_("Affix name too long in %s line %d: %s");
+static char *e_affform = N_("E761: Format error in affix file FOL, LOW or UPP");
+static char *e_affrange = N_("E762: Character in FOL, LOW or UPP is out of range");
+static char *msg_compressing = N_("Compressing word tree...");
+
+/*
+ * Load one spell file and store the info into a slang_T.
+ *
+ * This is invoked in three ways:
+ * - From spell_load_cb() to load a spell file for the first time.  "lang" is
+ *   the language name, "old_lp" is NULL.  Will allocate an slang_T.
+ * - To reload a spell file that was changed.  "lang" is NULL and "old_lp"
+ *   points to the existing slang_T.
+ * - Just after writing a .spl file; it's read back to produce the .sug file.
+ *   "old_lp" is NULL and "lang" is NULL.  Will allocate an slang_T.
+ *
+ * Returns the slang_T the spell file was loaded into.  NULL for error.
+ */
+    slang_T *
+spell_load_file(
+    char_u	*fname,
+    char_u	*lang,
+    slang_T	*old_lp,
+    int		silent)		/* no error if file doesn't exist */
+{
+    FILE	*fd;
+    char_u	buf[VIMSPELLMAGICL];
+    char_u	*p;
+    int		i;
+    int		n;
+    int		len;
+    char_u	*save_sourcing_name = sourcing_name;
+    linenr_T	save_sourcing_lnum = sourcing_lnum;
+    slang_T	*lp = NULL;
+    int		c = 0;
+    int		res;
+
+    fd = mch_fopen((char *)fname, "r");
+    if (fd == NULL)
+    {
+	if (!silent)
+	    EMSG2(_(e_notopen), fname);
+	else if (p_verbose > 2)
+	{
+	    verbose_enter();
+	    smsg((char_u *)e_notopen, fname);
+	    verbose_leave();
+	}
+	goto endFAIL;
+    }
+    if (p_verbose > 2)
+    {
+	verbose_enter();
+	smsg((char_u *)_("Reading spell file \"%s\""), fname);
+	verbose_leave();
+    }
+
+    if (old_lp == NULL)
+    {
+	lp = slang_alloc(lang);
+	if (lp == NULL)
+	    goto endFAIL;
+
+	/* Remember the file name, used to reload the file when it's updated. */
+	lp->sl_fname = vim_strsave(fname);
+	if (lp->sl_fname == NULL)
+	    goto endFAIL;
+
+	/* Check for .add.spl (_add.spl for VMS). */
+	lp->sl_add = strstr((char *)gettail(fname), SPL_FNAME_ADD) != NULL;
+    }
+    else
+	lp = old_lp;
+
+    /* Set sourcing_name, so that error messages mention the file name. */
+    sourcing_name = fname;
+    sourcing_lnum = 0;
+
+    /*
+     * <HEADER>: <fileID>
+     */
+    for (i = 0; i < VIMSPELLMAGICL; ++i)
+	buf[i] = getc(fd);				/* <fileID> */
+    if (STRNCMP(buf, VIMSPELLMAGIC, VIMSPELLMAGICL) != 0)
+    {
+	EMSG(_("E757: This does not look like a spell file"));
+	goto endFAIL;
+    }
+    c = getc(fd);					/* <versionnr> */
+    if (c < VIMSPELLVERSION)
+    {
+	EMSG(_("E771: Old spell file, needs to be updated"));
+	goto endFAIL;
+    }
+    else if (c > VIMSPELLVERSION)
+    {
+	EMSG(_("E772: Spell file is for newer version of Vim"));
+	goto endFAIL;
+    }
+
+
+    /*
+     * <SECTIONS>: <section> ... <sectionend>
+     * <section>: <sectionID> <sectionflags> <sectionlen> (section contents)
+     */
+    for (;;)
+    {
+	n = getc(fd);			    /* <sectionID> or <sectionend> */
+	if (n == SN_END)
+	    break;
+	c = getc(fd);					/* <sectionflags> */
+	len = get4c(fd);				/* <sectionlen> */
+	if (len < 0)
+	    goto truncerr;
+
+	res = 0;
+	switch (n)
+	{
+	    case SN_INFO:
+		lp->sl_info = read_string(fd, len);	/* <infotext> */
+		if (lp->sl_info == NULL)
+		    goto endFAIL;
+		break;
+
+	    case SN_REGION:
+		res = read_region_section(fd, lp, len);
+		break;
+
+	    case SN_CHARFLAGS:
+		res = read_charflags_section(fd);
+		break;
+
+	    case SN_MIDWORD:
+		lp->sl_midword = read_string(fd, len);	/* <midword> */
+		if (lp->sl_midword == NULL)
+		    goto endFAIL;
+		break;
+
+	    case SN_PREFCOND:
+		res = read_prefcond_section(fd, lp);
+		break;
+
+	    case SN_REP:
+		res = read_rep_section(fd, &lp->sl_rep, lp->sl_rep_first);
+		break;
+
+	    case SN_REPSAL:
+		res = read_rep_section(fd, &lp->sl_repsal, lp->sl_repsal_first);
+		break;
+
+	    case SN_SAL:
+		res = read_sal_section(fd, lp);
+		break;
+
+	    case SN_SOFO:
+		res = read_sofo_section(fd, lp);
+		break;
+
+	    case SN_MAP:
+		p = read_string(fd, len);		/* <mapstr> */
+		if (p == NULL)
+		    goto endFAIL;
+		set_map_str(lp, p);
+		vim_free(p);
+		break;
+
+	    case SN_WORDS:
+		res = read_words_section(fd, lp, len);
+		break;
+
+	    case SN_SUGFILE:
+		lp->sl_sugtime = get8ctime(fd);		/* <timestamp> */
+		break;
+
+	    case SN_NOSPLITSUGS:
+		lp->sl_nosplitsugs = TRUE;
+		break;
+
+	    case SN_NOCOMPOUNDSUGS:
+		lp->sl_nocompoundsugs = TRUE;
+		break;
+
+	    case SN_COMPOUND:
+		res = read_compound(fd, lp, len);
+		break;
+
+	    case SN_NOBREAK:
+		lp->sl_nobreak = TRUE;
+		break;
+
+	    case SN_SYLLABLE:
+		lp->sl_syllable = read_string(fd, len);	/* <syllable> */
+		if (lp->sl_syllable == NULL)
+		    goto endFAIL;
+		if (init_syl_tab(lp) == FAIL)
+		    goto endFAIL;
+		break;
+
+	    default:
+		/* Unsupported section.  When it's required give an error
+		 * message.  When it's not required skip the contents. */
+		if (c & SNF_REQUIRED)
+		{
+		    EMSG(_("E770: Unsupported section in spell file"));
+		    goto endFAIL;
+		}
+		while (--len >= 0)
+		    if (getc(fd) < 0)
+			goto truncerr;
+		break;
+	}
+someerror:
+	if (res == SP_FORMERROR)
+	{
+	    EMSG(_(e_format));
+	    goto endFAIL;
+	}
+	if (res == SP_TRUNCERROR)
+	{
+truncerr:
+	    EMSG(_(e_spell_trunc));
+	    goto endFAIL;
+	}
+	if (res == SP_OTHERERROR)
+	    goto endFAIL;
+    }
+
+    /* <LWORDTREE> */
+    res = spell_read_tree(fd, &lp->sl_fbyts, &lp->sl_fidxs, FALSE, 0);
+    if (res != 0)
+	goto someerror;
+
+    /* <KWORDTREE> */
+    res = spell_read_tree(fd, &lp->sl_kbyts, &lp->sl_kidxs, FALSE, 0);
+    if (res != 0)
+	goto someerror;
+
+    /* <PREFIXTREE> */
+    res = spell_read_tree(fd, &lp->sl_pbyts, &lp->sl_pidxs, TRUE,
+							    lp->sl_prefixcnt);
+    if (res != 0)
+	goto someerror;
+
+    /* For a new file link it in the list of spell files. */
+    if (old_lp == NULL && lang != NULL)
+    {
+	lp->sl_next = first_lang;
+	first_lang = lp;
+    }
+
+    goto endOK;
+
+endFAIL:
+    if (lang != NULL)
+	/* truncating the name signals the error to spell_load_lang() */
+	*lang = NUL;
+    if (lp != NULL && old_lp == NULL)
+	slang_free(lp);
+    lp = NULL;
+
+endOK:
+    if (fd != NULL)
+	fclose(fd);
+    sourcing_name = save_sourcing_name;
+    sourcing_lnum = save_sourcing_lnum;
+
+    return lp;
+}
+
+/*
+ * Fill in the wordcount fields for a trie.
+ * Returns the total number of words.
+ */
+    static void
+tree_count_words(char_u *byts, idx_T *idxs)
+{
+    int		depth;
+    idx_T	arridx[MAXWLEN];
+    int		curi[MAXWLEN];
+    int		c;
+    idx_T	n;
+    int		wordcount[MAXWLEN];
+
+    arridx[0] = 0;
+    curi[0] = 1;
+    wordcount[0] = 0;
+    depth = 0;
+    while (depth >= 0 && !got_int)
+    {
+	if (curi[depth] > byts[arridx[depth]])
+	{
+	    /* Done all bytes at this node, go up one level. */
+	    idxs[arridx[depth]] = wordcount[depth];
+	    if (depth > 0)
+		wordcount[depth - 1] += wordcount[depth];
+
+	    --depth;
+	    fast_breakcheck();
+	}
+	else
+	{
+	    /* Do one more byte at this node. */
+	    n = arridx[depth] + curi[depth];
+	    ++curi[depth];
+
+	    c = byts[n];
+	    if (c == 0)
+	    {
+		/* End of word, count it. */
+		++wordcount[depth];
+
+		/* Skip over any other NUL bytes (same word with different
+		 * flags). */
+		while (byts[n + 1] == 0)
+		{
+		    ++n;
+		    ++curi[depth];
+		}
+	    }
+	    else
+	    {
+		/* Normal char, go one level deeper to count the words. */
+		++depth;
+		arridx[depth] = idxs[n];
+		curi[depth] = 1;
+		wordcount[depth] = 0;
+	    }
+	}
+    }
+}
+
+/*
+ * Load the .sug files for languages that have one and weren't loaded yet.
+ */
+    void
+suggest_load_files(void)
+{
+    langp_T	*lp;
+    int		lpi;
+    slang_T	*slang;
+    char_u	*dotp;
+    FILE	*fd;
+    char_u	buf[MAXWLEN];
+    int		i;
+    time_t	timestamp;
+    int		wcount;
+    int		wordnr;
+    garray_T	ga;
+    int		c;
+
+    /* Do this for all languages that support sound folding. */
+    for (lpi = 0; lpi < curwin->w_s->b_langp.ga_len; ++lpi)
+    {
+	lp = LANGP_ENTRY(curwin->w_s->b_langp, lpi);
+	slang = lp->lp_slang;
+	if (slang->sl_sugtime != 0 && !slang->sl_sugloaded)
+	{
+	    /* Change ".spl" to ".sug" and open the file.  When the file isn't
+	     * found silently skip it.  Do set "sl_sugloaded" so that we
+	     * don't try again and again. */
+	    slang->sl_sugloaded = TRUE;
+
+	    dotp = vim_strrchr(slang->sl_fname, '.');
+	    if (dotp == NULL || fnamecmp(dotp, ".spl") != 0)
+		continue;
+	    STRCPY(dotp, ".sug");
+	    fd = mch_fopen((char *)slang->sl_fname, "r");
+	    if (fd == NULL)
+		goto nextone;
+
+	    /*
+	     * <SUGHEADER>: <fileID> <versionnr> <timestamp>
+	     */
+	    for (i = 0; i < VIMSUGMAGICL; ++i)
+		buf[i] = getc(fd);			/* <fileID> */
+	    if (STRNCMP(buf, VIMSUGMAGIC, VIMSUGMAGICL) != 0)
+	    {
+		EMSG2(_("E778: This does not look like a .sug file: %s"),
+							     slang->sl_fname);
+		goto nextone;
+	    }
+	    c = getc(fd);				/* <versionnr> */
+	    if (c < VIMSUGVERSION)
+	    {
+		EMSG2(_("E779: Old .sug file, needs to be updated: %s"),
+							     slang->sl_fname);
+		goto nextone;
+	    }
+	    else if (c > VIMSUGVERSION)
+	    {
+		EMSG2(_("E780: .sug file is for newer version of Vim: %s"),
+							     slang->sl_fname);
+		goto nextone;
+	    }
+
+	    /* Check the timestamp, it must be exactly the same as the one in
+	     * the .spl file.  Otherwise the word numbers won't match. */
+	    timestamp = get8ctime(fd);			/* <timestamp> */
+	    if (timestamp != slang->sl_sugtime)
+	    {
+		EMSG2(_("E781: .sug file doesn't match .spl file: %s"),
+							     slang->sl_fname);
+		goto nextone;
+	    }
+
+	    /*
+	     * <SUGWORDTREE>: <wordtree>
+	     * Read the trie with the soundfolded words.
+	     */
+	    if (spell_read_tree(fd, &slang->sl_sbyts, &slang->sl_sidxs,
+							       FALSE, 0) != 0)
+	    {
+someerror:
+		EMSG2(_("E782: error while reading .sug file: %s"),
+							     slang->sl_fname);
+		slang_clear_sug(slang);
+		goto nextone;
+	    }
+
+	    /*
+	     * <SUGTABLE>: <sugwcount> <sugline> ...
+	     *
+	     * Read the table with word numbers.  We use a file buffer for
+	     * this, because it's so much like a file with lines.  Makes it
+	     * possible to swap the info and save on memory use.
+	     */
+	    slang->sl_sugbuf = open_spellbuf();
+	    if (slang->sl_sugbuf == NULL)
+		goto someerror;
+							    /* <sugwcount> */
+	    wcount = get4c(fd);
+	    if (wcount < 0)
+		goto someerror;
+
+	    /* Read all the wordnr lists into the buffer, one NUL terminated
+	     * list per line. */
+	    ga_init2(&ga, 1, 100);
+	    for (wordnr = 0; wordnr < wcount; ++wordnr)
+	    {
+		ga.ga_len = 0;
+		for (;;)
+		{
+		    c = getc(fd);			    /* <sugline> */
+		    if (c < 0 || ga_grow(&ga, 1) == FAIL)
+			goto someerror;
+		    ((char_u *)ga.ga_data)[ga.ga_len++] = c;
+		    if (c == NUL)
+			break;
+		}
+		if (ml_append_buf(slang->sl_sugbuf, (linenr_T)wordnr,
+					 ga.ga_data, ga.ga_len, TRUE) == FAIL)
+		    goto someerror;
+	    }
+	    ga_clear(&ga);
+
+	    /*
+	     * Need to put word counts in the word tries, so that we can find
+	     * a word by its number.
+	     */
+	    tree_count_words(slang->sl_fbyts, slang->sl_fidxs);
+	    tree_count_words(slang->sl_sbyts, slang->sl_sidxs);
+
+nextone:
+	    if (fd != NULL)
+		fclose(fd);
+	    STRCPY(dotp, ".spl");
+	}
+    }
+}
+
+
+/*
+ * Read a length field from "fd" in "cnt_bytes" bytes.
+ * Allocate memory, read the string into it and add a NUL at the end.
+ * Returns NULL when the count is zero.
+ * Sets "*cntp" to SP_*ERROR when there is an error, length of the result
+ * otherwise.
+ */
+    static char_u *
+read_cnt_string(FILE *fd, int cnt_bytes, int *cntp)
+{
+    int		cnt = 0;
+    int		i;
+    char_u	*str;
+
+    /* read the length bytes, MSB first */
+    for (i = 0; i < cnt_bytes; ++i)
+	cnt = (cnt << 8) + getc(fd);
+    if (cnt < 0)
+    {
+	*cntp = SP_TRUNCERROR;
+	return NULL;
+    }
+    *cntp = cnt;
+    if (cnt == 0)
+	return NULL;	    /* nothing to read, return NULL */
+
+    str = read_string(fd, cnt);
+    if (str == NULL)
+	*cntp = SP_OTHERERROR;
+    return str;
+}
+
+/*
+ * Read SN_REGION: <regionname> ...
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_region_section(FILE *fd, slang_T *lp, int len)
+{
+    int		i;
+
+    if (len > 16)
+	return SP_FORMERROR;
+    for (i = 0; i < len; ++i)
+	lp->sl_regions[i] = getc(fd);			/* <regionname> */
+    lp->sl_regions[len] = NUL;
+    return 0;
+}
+
+/*
+ * Read SN_CHARFLAGS section: <charflagslen> <charflags>
+ *				<folcharslen> <folchars>
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_charflags_section(FILE *fd)
+{
+    char_u	*flags;
+    char_u	*fol;
+    int		flagslen, follen;
+
+    /* <charflagslen> <charflags> */
+    flags = read_cnt_string(fd, 1, &flagslen);
+    if (flagslen < 0)
+	return flagslen;
+
+    /* <folcharslen> <folchars> */
+    fol = read_cnt_string(fd, 2, &follen);
+    if (follen < 0)
+    {
+	vim_free(flags);
+	return follen;
+    }
+
+    /* Set the word-char flags and fill SPELL_ISUPPER() table. */
+    if (flags != NULL && fol != NULL)
+	set_spell_charflags(flags, flagslen, fol);
+
+    vim_free(flags);
+    vim_free(fol);
+
+    /* When <charflagslen> is zero then <fcharlen> must also be zero. */
+    if ((flags == NULL) != (fol == NULL))
+	return SP_FORMERROR;
+    return 0;
+}
+
+/*
+ * Read SN_PREFCOND section.
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_prefcond_section(FILE *fd, slang_T *lp)
+{
+    int		cnt;
+    int		i;
+    int		n;
+    char_u	*p;
+    char_u	buf[MAXWLEN + 1];
+
+    /* <prefcondcnt> <prefcond> ... */
+    cnt = get2c(fd);					/* <prefcondcnt> */
+    if (cnt <= 0)
+	return SP_FORMERROR;
+
+    lp->sl_prefprog = (regprog_T **)alloc_clear(
+					 (unsigned)sizeof(regprog_T *) * cnt);
+    if (lp->sl_prefprog == NULL)
+	return SP_OTHERERROR;
+    lp->sl_prefixcnt = cnt;
+
+    for (i = 0; i < cnt; ++i)
+    {
+	/* <prefcond> : <condlen> <condstr> */
+	n = getc(fd);					/* <condlen> */
+	if (n < 0 || n >= MAXWLEN)
+	    return SP_FORMERROR;
+
+	/* When <condlen> is zero we have an empty condition.  Otherwise
+	 * compile the regexp program used to check for the condition. */
+	if (n > 0)
+	{
+	    buf[0] = '^';	    /* always match at one position only */
+	    p = buf + 1;
+	    while (n-- > 0)
+		*p++ = getc(fd);			/* <condstr> */
+	    *p = NUL;
+	    lp->sl_prefprog[i] = vim_regcomp(buf, RE_MAGIC + RE_STRING);
+	}
+    }
+    return 0;
+}
+
+/*
+ * Read REP or REPSAL items section from "fd": <repcount> <rep> ...
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_rep_section(FILE *fd, garray_T *gap, short *first)
+{
+    int		cnt;
+    fromto_T	*ftp;
+    int		i;
+
+    cnt = get2c(fd);					/* <repcount> */
+    if (cnt < 0)
+	return SP_TRUNCERROR;
+
+    if (ga_grow(gap, cnt) == FAIL)
+	return SP_OTHERERROR;
+
+    /* <rep> : <repfromlen> <repfrom> <reptolen> <repto> */
+    for (; gap->ga_len < cnt; ++gap->ga_len)
+    {
+	ftp = &((fromto_T *)gap->ga_data)[gap->ga_len];
+	ftp->ft_from = read_cnt_string(fd, 1, &i);
+	if (i < 0)
+	    return i;
+	if (i == 0)
+	    return SP_FORMERROR;
+	ftp->ft_to = read_cnt_string(fd, 1, &i);
+	if (i <= 0)
+	{
+	    vim_free(ftp->ft_from);
+	    if (i < 0)
+		return i;
+	    return SP_FORMERROR;
+	}
+    }
+
+    /* Fill the first-index table. */
+    for (i = 0; i < 256; ++i)
+	first[i] = -1;
+    for (i = 0; i < gap->ga_len; ++i)
+    {
+	ftp = &((fromto_T *)gap->ga_data)[i];
+	if (first[*ftp->ft_from] == -1)
+	    first[*ftp->ft_from] = i;
+    }
+    return 0;
+}
+
+/*
+ * Read SN_SAL section: <salflags> <salcount> <sal> ...
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_sal_section(FILE *fd, slang_T *slang)
+{
+    int		i;
+    int		cnt;
+    garray_T	*gap;
+    salitem_T	*smp;
+    int		ccnt;
+    char_u	*p;
+    int		c = NUL;
+
+    slang->sl_sofo = FALSE;
+
+    i = getc(fd);				/* <salflags> */
+    if (i & SAL_F0LLOWUP)
+	slang->sl_followup = TRUE;
+    if (i & SAL_COLLAPSE)
+	slang->sl_collapse = TRUE;
+    if (i & SAL_REM_ACCENTS)
+	slang->sl_rem_accents = TRUE;
+
+    cnt = get2c(fd);				/* <salcount> */
+    if (cnt < 0)
+	return SP_TRUNCERROR;
+
+    gap = &slang->sl_sal;
+    ga_init2(gap, sizeof(salitem_T), 10);
+    if (ga_grow(gap, cnt + 1) == FAIL)
+	return SP_OTHERERROR;
+
+    /* <sal> : <salfromlen> <salfrom> <saltolen> <salto> */
+    for (; gap->ga_len < cnt; ++gap->ga_len)
+    {
+	smp = &((salitem_T *)gap->ga_data)[gap->ga_len];
+	ccnt = getc(fd);			/* <salfromlen> */
+	if (ccnt < 0)
+	    return SP_TRUNCERROR;
+	if ((p = alloc(ccnt + 2)) == NULL)
+	    return SP_OTHERERROR;
+	smp->sm_lead = p;
+
+	/* Read up to the first special char into sm_lead. */
+	for (i = 0; i < ccnt; ++i)
+	{
+	    c = getc(fd);			/* <salfrom> */
+	    if (vim_strchr((char_u *)"0123456789(-<^$", c) != NULL)
+		break;
+	    *p++ = c;
+	}
+	smp->sm_leadlen = (int)(p - smp->sm_lead);
+	*p++ = NUL;
+
+	/* Put (abc) chars in sm_oneof, if any. */
+	if (c == '(')
+	{
+	    smp->sm_oneof = p;
+	    for (++i; i < ccnt; ++i)
+	    {
+		c = getc(fd);			/* <salfrom> */
+		if (c == ')')
+		    break;
+		*p++ = c;
+	    }
+	    *p++ = NUL;
+	    if (++i < ccnt)
+		c = getc(fd);
+	}
+	else
+	    smp->sm_oneof = NULL;
+
+	/* Any following chars go in sm_rules. */
+	smp->sm_rules = p;
+	if (i < ccnt)
+	    /* store the char we got while checking for end of sm_lead */
+	    *p++ = c;
+	for (++i; i < ccnt; ++i)
+	    *p++ = getc(fd);			/* <salfrom> */
+	*p++ = NUL;
+
+	/* <saltolen> <salto> */
+	smp->sm_to = read_cnt_string(fd, 1, &ccnt);
+	if (ccnt < 0)
+	{
+	    vim_free(smp->sm_lead);
+	    return ccnt;
+	}
+
+#ifdef FEAT_MBYTE
+	if (has_mbyte)
+	{
+	    /* convert the multi-byte strings to wide char strings */
+	    smp->sm_lead_w = mb_str2wide(smp->sm_lead);
+	    smp->sm_leadlen = mb_charlen(smp->sm_lead);
+	    if (smp->sm_oneof == NULL)
+		smp->sm_oneof_w = NULL;
+	    else
+		smp->sm_oneof_w = mb_str2wide(smp->sm_oneof);
+	    if (smp->sm_to == NULL)
+		smp->sm_to_w = NULL;
+	    else
+		smp->sm_to_w = mb_str2wide(smp->sm_to);
+	    if (smp->sm_lead_w == NULL
+		    || (smp->sm_oneof_w == NULL && smp->sm_oneof != NULL)
+		    || (smp->sm_to_w == NULL && smp->sm_to != NULL))
+	    {
+		vim_free(smp->sm_lead);
+		vim_free(smp->sm_to);
+		vim_free(smp->sm_lead_w);
+		vim_free(smp->sm_oneof_w);
+		vim_free(smp->sm_to_w);
+		return SP_OTHERERROR;
+	    }
+	}
+#endif
+    }
+
+    if (gap->ga_len > 0)
+    {
+	/* Add one extra entry to mark the end with an empty sm_lead.  Avoids
+	 * that we need to check the index every time. */
+	smp = &((salitem_T *)gap->ga_data)[gap->ga_len];
+	if ((p = alloc(1)) == NULL)
+	    return SP_OTHERERROR;
+	p[0] = NUL;
+	smp->sm_lead = p;
+	smp->sm_leadlen = 0;
+	smp->sm_oneof = NULL;
+	smp->sm_rules = p;
+	smp->sm_to = NULL;
+#ifdef FEAT_MBYTE
+	if (has_mbyte)
+	{
+	    smp->sm_lead_w = mb_str2wide(smp->sm_lead);
+	    smp->sm_leadlen = 0;
+	    smp->sm_oneof_w = NULL;
+	    smp->sm_to_w = NULL;
+	}
+#endif
+	++gap->ga_len;
+    }
+
+    /* Fill the first-index table. */
+    set_sal_first(slang);
+
+    return 0;
+}
+
+/*
+ * Read SN_WORDS: <word> ...
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_words_section(FILE *fd, slang_T *lp, int len)
+{
+    int		done = 0;
+    int		i;
+    int		c;
+    char_u	word[MAXWLEN];
+
+    while (done < len)
+    {
+	/* Read one word at a time. */
+	for (i = 0; ; ++i)
+	{
+	    c = getc(fd);
+	    if (c == EOF)
+		return SP_TRUNCERROR;
+	    word[i] = c;
+	    if (word[i] == NUL)
+		break;
+	    if (i == MAXWLEN - 1)
+		return SP_FORMERROR;
+	}
+
+	/* Init the count to 10. */
+	count_common_word(lp, word, -1, 10);
+	done += i + 1;
+    }
+    return 0;
+}
+
+/*
+ * SN_SOFO: <sofofromlen> <sofofrom> <sofotolen> <sofoto>
+ * Return SP_*ERROR flags.
+ */
+    static int
+read_sofo_section(FILE *fd, slang_T *slang)
+{
+    int		cnt;
+    char_u	*from, *to;
+    int		res;
+
+    slang->sl_sofo = TRUE;
+
+    /* <sofofromlen> <sofofrom> */
+    from = read_cnt_string(fd, 2, &cnt);
+    if (cnt < 0)
+	return cnt;
+
+    /* <sofotolen> <sofoto> */
+    to = read_cnt_string(fd, 2, &cnt);
+    if (cnt < 0)
+    {
+	vim_free(from);
+	return cnt;
+    }
+
+    /* Store the info in slang->sl_sal and/or slang->sl_sal_first. */
+    if (from != NULL && to != NULL)
+	res = set_sofo(slang, from, to);
+    else if (from != NULL || to != NULL)
+	res = SP_FORMERROR;    /* only one of two strings is an error */
+    else
+	res = 0;
+
+    vim_free(from);
+    vim_free(to);
+    return res;
+}
+
+/*
+ * Read the compound section from the .spl file:
+ *	<compmax> <compminlen> <compsylmax> <compoptions> <compflags>
+ * Returns SP_*ERROR flags.
+ */
+    static int
+read_compound(FILE *fd, slang_T *slang, int len)
+{
+    int		todo = len;
+    int		c;
+    int		atstart;
+    char_u	*pat;
+    char_u	*pp;
+    char_u	*cp;
+    char_u	*ap;
+    char_u	*crp;
+    int		cnt;
+    garray_T	*gap;
+
+    if (todo < 2)
+	return SP_FORMERROR;	/* need at least two bytes */
+
+    --todo;
+    c = getc(fd);					/* <compmax> */
+    if (c < 2)
+	c = MAXWLEN;
+    slang->sl_compmax = c;
+
+    --todo;
+    c = getc(fd);					/* <compminlen> */
+    if (c < 1)
+	c = 0;
+    slang->sl_compminlen = c;
+
+    --todo;
+    c = getc(fd);					/* <compsylmax> */
+    if (c < 1)
+	c = MAXWLEN;
+    slang->sl_compsylmax = c;
+
+    c = getc(fd);					/* <compoptions> */
+    if (c != 0)
+	ungetc(c, fd);	    /* be backwards compatible with Vim 7.0b */
+    else
+    {
+	--todo;
+	c = getc(fd);	    /* only use the lower byte for now */
+	--todo;
+	slang->sl_compoptions = c;
+
+	gap = &slang->sl_comppat;
+	c = get2c(fd);					/* <comppatcount> */
+	todo -= 2;
+	ga_init2(gap, sizeof(char_u *), c);
+	if (ga_grow(gap, c) == OK)
+	    while (--c >= 0)
+	    {
+		((char_u **)(gap->ga_data))[gap->ga_len++] =
+						 read_cnt_string(fd, 1, &cnt);
+					    /* <comppatlen> <comppattext> */
+		if (cnt < 0)
+		    return cnt;
+		todo -= cnt + 1;
+	    }
+    }
+    if (todo < 0)
+	return SP_FORMERROR;
+
+    /* Turn the COMPOUNDRULE items into a regexp pattern:
+     * "a[bc]/a*b+" -> "^\(a[bc]\|a*b\+\)$".
+     * Inserting backslashes may double the length, "^\(\)$<Nul>" is 7 bytes.
+     * Conversion to utf-8 may double the size. */
+    c = todo * 2 + 7;
+#ifdef FEAT_MBYTE
+    if (enc_utf8)
+	c += todo * 2;
+#endif
+    pat = alloc((unsigned)c);
+    if (pat == NULL)
+	return SP_OTHERERROR;
+
+    /* We also need a list of all flags that can appear at the start and one
+     * for all flags. */
+    cp = alloc(todo + 1);
+    if (cp == NULL)
+    {
+	vim_free(pat);
+	return SP_OTHERERROR;
+    }
+    slang->sl_compstartflags = cp;
+    *cp = NUL;
+
+    ap = alloc(todo + 1);
+    if (ap == NULL)
+    {
+	vim_free(pat);
+	return SP_OTHERERROR;
+    }
+    slang->sl_compallflags = ap;
+    *ap = NUL;
+
+    /* And a list of all patterns in their original form, for checking whether
+     * compounding may work in match_compoundrule().  This is freed when we
+     * encounter a wildcard, the check doesn't work then. */
+    crp = alloc(todo + 1);
+    slang->sl_comprules = crp;
+
+    pp = pat;
+    *pp++ = '^';
+    *pp++ = '\\';
+    *pp++ = '(';
+
+    atstart = 1;
+    while (todo-- > 0)
+    {
+	c = getc(fd);					/* <compflags> */
+	if (c == EOF)
+	{
+	    vim_free(pat);
+	    return SP_TRUNCERROR;
+	}
+
+	/* Add all flags to "sl_compallflags". */
+	if (vim_strchr((char_u *)"?*+[]/", c) == NULL
+		&& !byte_in_str(slang->sl_compallflags, c))
+	{
+	    *ap++ = c;
+	    *ap = NUL;
+	}
+
+	if (atstart != 0)
+	{
+	    /* At start of item: copy flags to "sl_compstartflags".  For a
+	     * [abc] item set "atstart" to 2 and copy up to the ']'. */
+	    if (c == '[')
+		atstart = 2;
+	    else if (c == ']')
+		atstart = 0;
+	    else
+	    {
+		if (!byte_in_str(slang->sl_compstartflags, c))
+		{
+		    *cp++ = c;
+		    *cp = NUL;
+		}
+		if (atstart == 1)
+		    atstart = 0;
+	    }
+	}
+
+	/* Copy flag to "sl_comprules", unless we run into a wildcard. */
+	if (crp != NULL)
+	{
+	    if (c == '?' || c == '+' || c == '*')
+	    {
+		vim_free(slang->sl_comprules);
+		slang->sl_comprules = NULL;
+		crp = NULL;
+	    }
+	    else
+		*crp++ = c;
+	}
+
+	if (c == '/')	    /* slash separates two items */
+	{
+	    *pp++ = '\\';
+	    *pp++ = '|';
+	    atstart = 1;
+	}
+	else		    /* normal char, "[abc]" and '*' are copied as-is */
+	{
+	    if (c == '?' || c == '+' || c == '~')
+		*pp++ = '\\';	    /* "a?" becomes "a\?", "a+" becomes "a\+" */
+#ifdef FEAT_MBYTE
+	    if (enc_utf8)
+		pp += mb_char2bytes(c, pp);
+	    else
+#endif
+		*pp++ = c;
+	}
+    }
+
+    *pp++ = '\\';
+    *pp++ = ')';
+    *pp++ = '$';
+    *pp = NUL;
+
+    if (crp != NULL)
+	*crp = NUL;
+
+    slang->sl_compprog = vim_regcomp(pat, RE_MAGIC + RE_STRING + RE_STRICT);
+    vim_free(pat);
+    if (slang->sl_compprog == NULL)
+	return SP_FORMERROR;
+
+    return 0;
+}
+
+/*
+ * Set the SOFOFROM and SOFOTO items in language "lp".
+ * Returns SP_*ERROR flags when there is something wrong.
+ */
+    static int
+set_sofo(slang_T *lp, char_u *from, char_u *to)
+{
+    int		i;
+
+#ifdef FEAT_MBYTE
+    garray_T	*gap;
+    char_u	*s;
+    char_u	*p;
+    int		c;
+    int		*inp;
+
+    if (has_mbyte)
+    {
+	/* Use "sl_sal" as an array with 256 pointers to a list of wide
+	 * characters.  The index is the low byte of the character.
+	 * The list contains from-to pairs with a terminating NUL.
+	 * sl_sal_first[] is used for latin1 "from" characters. */
+	gap = &lp->sl_sal;
+	ga_init2(gap, sizeof(int *), 1);
+	if (ga_grow(gap, 256) == FAIL)
+	    return SP_OTHERERROR;
+	vim_memset(gap->ga_data, 0, sizeof(int *) * 256);
+	gap->ga_len = 256;
+
+	/* First count the number of items for each list.  Temporarily use
+	 * sl_sal_first[] for this. */
+	for (p = from, s = to; *p != NUL && *s != NUL; )
+	{
+	    c = mb_cptr2char_adv(&p);
+	    mb_cptr_adv(s);
+	    if (c >= 256)
+		++lp->sl_sal_first[c & 0xff];
+	}
+	if (*p != NUL || *s != NUL)	    /* lengths differ */
+	    return SP_FORMERROR;
+
+	/* Allocate the lists. */
+	for (i = 0; i < 256; ++i)
+	    if (lp->sl_sal_first[i] > 0)
+	    {
+		p = alloc(sizeof(int) * (lp->sl_sal_first[i] * 2 + 1));
+		if (p == NULL)
+		    return SP_OTHERERROR;
+		((int **)gap->ga_data)[i] = (int *)p;
+		*(int *)p = 0;
+	    }
+
+	/* Put the characters up to 255 in sl_sal_first[] the rest in a sl_sal
+	 * list. */
+	vim_memset(lp->sl_sal_first, 0, sizeof(salfirst_T) * 256);
+	for (p = from, s = to; *p != NUL && *s != NUL; )
+	{
+	    c = mb_cptr2char_adv(&p);
+	    i = mb_cptr2char_adv(&s);
+	    if (c >= 256)
+	    {
+		/* Append the from-to chars at the end of the list with
+		 * the low byte. */
+		inp = ((int **)gap->ga_data)[c & 0xff];
+		while (*inp != 0)
+		    ++inp;
+		*inp++ = c;		/* from char */
+		*inp++ = i;		/* to char */
+		*inp++ = NUL;		/* NUL at the end */
+	    }
+	    else
+		/* mapping byte to char is done in sl_sal_first[] */
+		lp->sl_sal_first[c] = i;
+	}
+    }
+    else
+#endif
+    {
+	/* mapping bytes to bytes is done in sl_sal_first[] */
+	if (STRLEN(from) != STRLEN(to))
+	    return SP_FORMERROR;
+
+	for (i = 0; to[i] != NUL; ++i)
+	    lp->sl_sal_first[from[i]] = to[i];
+	lp->sl_sal.ga_len = 1;		/* indicates we have soundfolding */
+    }
+
+    return 0;
+}
+
+/*
+ * Fill the first-index table for "lp".
+ */
+    static void
+set_sal_first(slang_T *lp)
+{
+    salfirst_T	*sfirst;
+    int		i;
+    salitem_T	*smp;
+    int		c;
+    garray_T	*gap = &lp->sl_sal;
+
+    sfirst = lp->sl_sal_first;
+    for (i = 0; i < 256; ++i)
+	sfirst[i] = -1;
+    smp = (salitem_T *)gap->ga_data;
+    for (i = 0; i < gap->ga_len; ++i)
+    {
+#ifdef FEAT_MBYTE
+	if (has_mbyte)
+	    /* Use the lowest byte of the first character.  For latin1 it's
+	     * the character, for other encodings it should differ for most
+	     * characters. */
+	    c = *smp[i].sm_lead_w & 0xff;
+	else
+#endif
+	    c = *smp[i].sm_lead;
+	if (sfirst[c] == -1)
+	{
+	    sfirst[c] = i;
+#ifdef FEAT_MBYTE
+	    if (has_mbyte)
+	    {
+		int		n;
+
+		/* Make sure all entries with this byte are following each
+		 * other.  Move the ones that are in the wrong position.  Do
+		 * keep the same ordering! */
+		while (i + 1 < gap->ga_len
+				       && (*smp[i + 1].sm_lead_w & 0xff) == c)
+		    /* Skip over entry with same index byte. */
+		    ++i;
+
+		for (n = 1; i + n < gap->ga_len; ++n)
+		    if ((*smp[i + n].sm_lead_w & 0xff) == c)
+		    {
+			salitem_T  tsal;
+
+			/* Move entry with same index byte after the entries
+			 * we already found. */
+			++i;
+			--n;
+			tsal = smp[i + n];
+			mch_memmove(smp + i + 1, smp + i,
+						       sizeof(salitem_T) * n);
+			smp[i] = tsal;
+		    }
+	    }
+#endif
+	}
+    }
+}
+
+#ifdef FEAT_MBYTE
+/*
+ * Turn a multi-byte string into a wide character string.
+ * Return it in allocated memory (NULL for out-of-memory)
+ */
+    static int *
+mb_str2wide(char_u *s)
+{
+    int		*res;
+    char_u	*p;
+    int		i = 0;
+
+    res = (int *)alloc(sizeof(int) * (mb_charlen(s) + 1));
+    if (res != NULL)
+    {
+	for (p = s; *p != NUL; )
+	    res[i++] = mb_ptr2char_adv(&p);
+	res[i] = NUL;
+    }
+    return res;
+}
+#endif
+
+/*
+ * Read a tree from the .spl or .sug file.
+ * Allocates the memory and stores pointers in "bytsp" and "idxsp".
+ * This is skipped when the tree has zero length.
+ * Returns zero when OK, SP_ value for an error.
+ */
+    static int
+spell_read_tree(
+    FILE	*fd,
+    char_u	**bytsp,
+    idx_T	**idxsp,
+    int		prefixtree,	/* TRUE for the prefix tree */
+    int		prefixcnt)	/* when "prefixtree" is TRUE: prefix count */
+{
+    int		len;
+    int		idx;
+    char_u	*bp;
+    idx_T	*ip;
+
+    /* The tree size was computed when writing the file, so that we can
+     * allocate it as one long block. <nodecount> */
+    len = get4c(fd);
+    if (len < 0)
+	return SP_TRUNCERROR;
+    if (len > 0)
+    {
+	/* Allocate the byte array. */
+	bp = lalloc((long_u)len, TRUE);
+	if (bp == NULL)
+	    return SP_OTHERERROR;
+	*bytsp = bp;
+
+	/* Allocate the index array. */
+	ip = (idx_T *)lalloc_clear((long_u)(len * sizeof(int)), TRUE);
+	if (ip == NULL)
+	    return SP_OTHERERROR;
+	*idxsp = ip;
+
+	/* Recursively read the tree and store it in the array. */
+	idx = read_tree_node(fd, bp, ip, len, 0, prefixtree, prefixcnt);
+	if (idx < 0)
+	    return idx;
+    }
+    return 0;
+}
+
+/*
+ * Read one row of siblings from the spell file and store it in the byte array
+ * "byts" and index array "idxs".  Recursively read the children.
+ *
+ * NOTE: The code here must match put_node()!
+ *
+ * Returns the index (>= 0) following the siblings.
+ * Returns SP_TRUNCERROR if the file is shorter than expected.
+ * Returns SP_FORMERROR if there is a format error.
+ */
+    static idx_T
+read_tree_node(
+    FILE	*fd,
+    char_u	*byts,
+    idx_T	*idxs,
+    int		maxidx,		    /* size of arrays */
+    idx_T	startidx,	    /* current index in "byts" and "idxs" */
+    int		prefixtree,	    /* TRUE for reading PREFIXTREE */
+    int		maxprefcondnr)	    /* maximum for <prefcondnr> */
+{
+    int		len;
+    int		i;
+    int		n;
+    idx_T	idx = startidx;
+    int		c;
+    int		c2;
+#define SHARED_MASK	0x8000000
+
+    len = getc(fd);					/* <siblingcount> */
+    if (len <= 0)
+	return SP_TRUNCERROR;
+
+    if (startidx + len >= maxidx)
+	return SP_FORMERROR;
+    byts[idx++] = len;
+
+    /* Read the byte values, flag/region bytes and shared indexes. */
+    for (i = 1; i <= len; ++i)
+    {
+	c = getc(fd);					/* <byte> */
+	if (c < 0)
+	    return SP_TRUNCERROR;
+	if (c <= BY_SPECIAL)
+	{
+	    if (c == BY_NOFLAGS && !prefixtree)
+	    {
+		/* No flags, all regions. */
+		idxs[idx] = 0;
+		c = 0;
+	    }
+	    else if (c != BY_INDEX)
+	    {
+		if (prefixtree)
+		{
+		    /* Read the optional pflags byte, the prefix ID and the
+		     * condition nr.  In idxs[] store the prefix ID in the low
+		     * byte, the condition index shifted up 8 bits, the flags
+		     * shifted up 24 bits. */
+		    if (c == BY_FLAGS)
+			c = getc(fd) << 24;		/* <pflags> */
+		    else
+			c = 0;
+
+		    c |= getc(fd);			/* <affixID> */
+
+		    n = get2c(fd);			/* <prefcondnr> */
+		    if (n >= maxprefcondnr)
+			return SP_FORMERROR;
+		    c |= (n << 8);
+		}
+		else /* c must be BY_FLAGS or BY_FLAGS2 */
+		{
+		    /* Read flags and optional region and prefix ID.  In
+		     * idxs[] the flags go in the low two bytes, region above
+		     * that and prefix ID above the region. */
+		    c2 = c;
+		    c = getc(fd);			/* <flags> */
+		    if (c2 == BY_FLAGS2)
+			c = (getc(fd) << 8) + c;	/* <flags2> */
+		    if (c & WF_REGION)
+			c = (getc(fd) << 16) + c;	/* <region> */
+		    if (c & WF_AFX)
+			c = (getc(fd) << 24) + c;	/* <affixID> */
+		}
+
+		idxs[idx] = c;
+		c = 0;
+	    }
+	    else /* c == BY_INDEX */
+	    {
+							/* <nodeidx> */
+		n = get3c(fd);
+		if (n < 0 || n >= maxidx)
+		    return SP_FORMERROR;
+		idxs[idx] = n + SHARED_MASK;
+		c = getc(fd);				/* <xbyte> */
+	    }
+	}
+	byts[idx++] = c;
+    }
+
+    /* Recursively read the children for non-shared siblings.
+     * Skip the end-of-word ones (zero byte value) and the shared ones (and
+     * remove SHARED_MASK) */
+    for (i = 1; i <= len; ++i)
+	if (byts[startidx + i] != 0)
+	{
+	    if (idxs[startidx + i] & SHARED_MASK)
+		idxs[startidx + i] &= ~SHARED_MASK;
+	    else
+	    {
+		idxs[startidx + i] = idx;
+		idx = read_tree_node(fd, byts, idxs, maxidx, idx,
+						     prefixtree, maxprefcondnr);
+		if (idx < 0)
+		    break;
+	    }
+	}
+
+    return idx;
+}
+
+/*
+ * Reload the spell file "fname" if it's loaded.
+ */
+    static void
+spell_reload_one(
+    char_u	*fname,
+    int		added_word)	/* invoked through "zg" */
+{
+    slang_T	*slang;
+    int		didit = FALSE;
+
+    for (slang = first_lang; slang != NULL; slang = slang->sl_next)
+    {
+	if (fullpathcmp(fname, slang->sl_fname, FALSE) == FPC_SAME)
+	{
+	    slang_clear(slang);
+	    if (spell_load_file(fname, NULL, slang, FALSE) == NULL)
+		/* reloading failed, clear the language */
+		slang_clear(slang);
+	    redraw_all_later(SOME_VALID);
+	    didit = TRUE;
+	}
+    }
+
+    /* When "zg" was used and the file wasn't loaded yet, should redo
+     * 'spelllang' to load it now. */
+    if (added_word && !didit)
+	did_set_spelllang(curwin);
+}
+
+
+/*
+ * Functions for ":mkspell".
+ */
+
+#define MAXLINELEN  500		/* Maximum length in bytes of a line in a .aff
+				   and .dic file. */
+/*
+ * Main structure to store the contents of a ".aff" file.
+ */
+typedef struct afffile_S
+{
+    char_u	*af_enc;	/* "SET", normalized, alloc'ed string or NULL */
+    int		af_flagtype;	/* AFT_CHAR, AFT_LONG, AFT_NUM or AFT_CAPLONG */
+    unsigned	af_rare;	/* RARE ID for rare word */
+    unsigned	af_keepcase;	/* KEEPCASE ID for keep-case word */
+    unsigned	af_bad;		/* BAD ID for banned word */
+    unsigned	af_needaffix;	/* NEEDAFFIX ID */
+    unsigned	af_circumfix;	/* CIRCUMFIX ID */
+    unsigned	af_needcomp;	/* NEEDCOMPOUND ID */
+    unsigned	af_comproot;	/* COMPOUNDROOT ID */
+    unsigned	af_compforbid;	/* COMPOUNDFORBIDFLAG ID */
+    unsigned	af_comppermit;	/* COMPOUNDPERMITFLAG ID */
+    unsigned	af_nosuggest;	/* NOSUGGEST ID */
+    int		af_pfxpostpone;	/* postpone prefixes without chop string and
+				   without flags */
+    int		af_ignoreextra;	/* IGNOREEXTRA present */
+    hashtab_T	af_pref;	/* hashtable for prefixes, affheader_T */
+    hashtab_T	af_suff;	/* hashtable for suffixes, affheader_T */
+    hashtab_T	af_comp;	/* hashtable for compound flags, compitem_T */
+} afffile_T;
+
+#define AFT_CHAR	0	/* flags are one character */
+#define AFT_LONG	1	/* flags are two characters */
+#define AFT_CAPLONG	2	/* flags are one or two characters */
+#define AFT_NUM		3	/* flags are numbers, comma separated */
+
+typedef struct affentry_S affentry_T;
+/* Affix entry from ".aff" file.  Used for prefixes and suffixes. */
+struct affentry_S
+{
+    affentry_T	*ae_next;	/* next affix with same name/number */
+    char_u	*ae_chop;	/* text to chop off basic word (can be NULL) */
+    char_u	*ae_add;	/* text to add to basic word (can be NULL) */
+    char_u	*ae_flags;	/* flags on the affix (can be NULL) */
+    char_u	*ae_cond;	/* condition (NULL for ".") */
+    regprog_T	*ae_prog;	/* regexp program for ae_cond or NULL */
+    char	ae_compforbid;	/* COMPOUNDFORBIDFLAG found */
+    char	ae_comppermit;	/* COMPOUNDPERMITFLAG found */
+};
+
+#ifdef FEAT_MBYTE
+# define AH_KEY_LEN 17		/* 2 x 8 bytes + NUL */
+#else
+# define AH_KEY_LEN 7		/* 6 digits + NUL */
+#endif
+
+/* Affix header from ".aff" file.  Used for af_pref and af_suff. */
+typedef struct affheader_S
+{
+    char_u	ah_key[AH_KEY_LEN]; /* key for hashtab == name of affix */
+    unsigned	ah_flag;	/* affix name as number, uses "af_flagtype" */
+    int		ah_newID;	/* prefix ID after renumbering; 0 if not used */
+    int		ah_combine;	/* suffix may combine with prefix */
+    int		ah_follows;	/* another affix block should be following */
+    affentry_T	*ah_first;	/* first affix entry */
+} affheader_T;
+
+#define HI2AH(hi)   ((affheader_T *)(hi)->hi_key)
+
+/* Flag used in compound items. */
+typedef struct compitem_S
+{
+    char_u	ci_key[AH_KEY_LEN]; /* key for hashtab == name of compound */
+    unsigned	ci_flag;	/* affix name as number, uses "af_flagtype" */
+    int		ci_newID;	/* affix ID after renumbering. */
+} compitem_T;
+
+#define HI2CI(hi)   ((compitem_T *)(hi)->hi_key)
+
+/*
+ * Structure that is used to store the items in the word tree.  This avoids
+ * the need to keep track of each allocated thing, everything is freed all at
+ * once after ":mkspell" is done.
+ * Note: "sb_next" must be just before "sb_data" to make sure the alignment of
+ * "sb_data" is correct for systems where pointers must be aligned on
+ * pointer-size boundaries and sizeof(pointer) > sizeof(int) (e.g., Sparc).
+ */
+#define  SBLOCKSIZE 16000	/* size of sb_data */
+typedef struct sblock_S sblock_T;
+struct sblock_S
+{
+    int		sb_used;	/* nr of bytes already in use */
+    sblock_T	*sb_next;	/* next block in list */
+    char_u	sb_data[1];	/* data, actually longer */
+};
+
+/*
+ * A node in the tree.
+ */
+typedef struct wordnode_S wordnode_T;
+struct wordnode_S
+{
+    union   /* shared to save space */
+    {
+	char_u	hashkey[6];	/* the hash key, only used while compressing */
+	int	index;		/* index in written nodes (valid after first
+				   round) */
+    } wn_u1;
+    union   /* shared to save space */
+    {
+	wordnode_T *next;	/* next node with same hash key */
+	wordnode_T *wnode;	/* parent node that will write this node */
+    } wn_u2;
+    wordnode_T	*wn_child;	/* child (next byte in word) */
+    wordnode_T  *wn_sibling;	/* next sibling (alternate byte in word,
+				   always sorted) */
+    int		wn_refs;	/* Nr. of references to this node.  Only
+				   relevant for first node in a list of
+				   siblings, in following siblings it is
+				   always one. */
+    char_u	wn_byte;	/* Byte for this node. NUL for word end */
+
+    /* Info for when "wn_byte" is NUL.
+     * In PREFIXTREE "wn_region" is used for the prefcondnr.
+     * In the soundfolded word tree "wn_flags" has the MSW of the wordnr and
+     * "wn_region" the LSW of the wordnr. */
+    char_u	wn_affixID;	/* supported/required prefix ID or 0 */
+    short_u	wn_flags;	/* WF_ flags */
+    short	wn_region;	/* region mask */
+
+#ifdef SPELL_PRINTTREE
+    int		wn_nr;		/* sequence nr for printing */
+#endif
+};
+
+#define WN_MASK	 0xffff		/* mask relevant bits of "wn_flags" */
+
+#define HI2WN(hi)    (wordnode_T *)((hi)->hi_key)
+
+/*
+ * Info used while reading the spell files.
+ */
+typedef struct spellinfo_S
+{
+    wordnode_T	*si_foldroot;	/* tree with case-folded words */
+    long	si_foldwcount;	/* nr of words in si_foldroot */
+
+    wordnode_T	*si_keeproot;	/* tree with keep-case words */
+    long	si_keepwcount;	/* nr of words in si_keeproot */
+
+    wordnode_T	*si_prefroot;	/* tree with postponed prefixes */
+
+    long	si_sugtree;	/* creating the soundfolding trie */
+
+    sblock_T	*si_blocks;	/* memory blocks used */
+    long	si_blocks_cnt;	/* memory blocks allocated */
+    int		si_did_emsg;	/* TRUE when ran out of memory */
+
+    long	si_compress_cnt;    /* words to add before lowering
+				       compression limit */
+    wordnode_T	*si_first_free; /* List of nodes that have been freed during
+				   compression, linked by "wn_child" field. */
+    long	si_free_count;	/* number of nodes in si_first_free */
+#ifdef SPELL_PRINTTREE
+    int		si_wordnode_nr;	/* sequence nr for nodes */
+#endif
+    buf_T	*si_spellbuf;	/* buffer used to store soundfold word table */
+
+    int		si_ascii;	/* handling only ASCII words */
+    int		si_add;		/* addition file */
+    int		si_clear_chartab;   /* when TRUE clear char tables */
+    int		si_region;	/* region mask */
+    vimconv_T	si_conv;	/* for conversion to 'encoding' */
+    int		si_memtot;	/* runtime memory used */
+    int		si_verbose;	/* verbose messages */
+    int		si_msg_count;	/* number of words added since last message */
+    char_u	*si_info;	/* info text chars or NULL  */
+    int		si_region_count; /* number of regions supported (1 when there
+				    are no regions) */
+    char_u	si_region_name[17]; /* region names; used only if
+				     * si_region_count > 1) */
+
+    garray_T	si_rep;		/* list of fromto_T entries from REP lines */
+    garray_T	si_repsal;	/* list of fromto_T entries from REPSAL lines */
+    garray_T	si_sal;		/* list of fromto_T entries from SAL lines */
+    char_u	*si_sofofr;	/* SOFOFROM text */
+    char_u	*si_sofoto;	/* SOFOTO text */
+    int		si_nosugfile;	/* NOSUGFILE item found */
+    int		si_nosplitsugs;	/* NOSPLITSUGS item found */
+    int		si_nocompoundsugs; /* NOCOMPOUNDSUGS item found */
+    int		si_followup;	/* soundsalike: ? */
+    int		si_collapse;	/* soundsalike: ? */
+    hashtab_T	si_commonwords;	/* hashtable for common words */
+    time_t	si_sugtime;	/* timestamp for .sug file */
+    int		si_rem_accents;	/* soundsalike: remove accents */
+    garray_T	si_map;		/* MAP info concatenated */
+    char_u	*si_midword;	/* MIDWORD chars or NULL  */
+    int		si_compmax;	/* max nr of words for compounding */
+    int		si_compminlen;	/* minimal length for compounding */
+    int		si_compsylmax;	/* max nr of syllables for compounding */
+    int		si_compoptions;	/* COMP_ flags */
+    garray_T	si_comppat;	/* CHECKCOMPOUNDPATTERN items, each stored as
+				   a string */
+    char_u	*si_compflags;	/* flags used for compounding */
+    char_u	si_nobreak;	/* NOBREAK */
+    char_u	*si_syllable;	/* syllable string */
+    garray_T	si_prefcond;	/* table with conditions for postponed
+				 * prefixes, each stored as a string */
+    int		si_newprefID;	/* current value for ah_newID */
+    int		si_newcompID;	/* current value for compound ID */
+} spellinfo_T;
+
+static afffile_T *spell_read_aff(spellinfo_T *spin, char_u *fname);
+static int is_aff_rule(char_u **items, int itemcnt, char *rulename, int	 mincount);
+static void aff_process_flags(afffile_T *affile, affentry_T *entry);
+static int spell_info_item(char_u *s);
+static unsigned affitem2flag(int flagtype, char_u *item, char_u	*fname, int lnum);
+static unsigned get_affitem(int flagtype, char_u **pp);
+static void process_compflags(spellinfo_T *spin, afffile_T *aff, char_u *compflags);
+static void check_renumber(spellinfo_T *spin);
+static int flag_in_afflist(int flagtype, char_u *afflist, unsigned flag);
+static void aff_check_number(int spinval, int affval, char *name);
+static void aff_check_string(char_u *spinval, char_u *affval, char *name);
+static int str_equal(char_u *s1, char_u	*s2);
+static void add_fromto(spellinfo_T *spin, garray_T *gap, char_u	*from, char_u *to);
+static int sal_to_bool(char_u *s);
+static void spell_free_aff(afffile_T *aff);
+static int spell_read_dic(spellinfo_T *spin, char_u *fname, afffile_T *affile);
+static int get_affix_flags(afffile_T *affile, char_u *afflist);
+static int get_pfxlist(afffile_T *affile, char_u *afflist, char_u *store_afflist);
+static void get_compflags(afffile_T *affile, char_u *afflist, char_u *store_afflist);
+static int store_aff_word(spellinfo_T *spin, char_u *word, char_u *afflist, afffile_T *affile, hashtab_T *ht, hashtab_T *xht, int condit, int flags, char_u *pfxlist, int pfxlen);
+static int spell_read_wordfile(spellinfo_T *spin, char_u *fname);
+static void *getroom(spellinfo_T *spin, size_t len, int align);
+static char_u *getroom_save(spellinfo_T *spin, char_u *s);
+static void free_blocks(sblock_T *bl);
+static wordnode_T *wordtree_alloc(spellinfo_T *spin);
+static int store_word(spellinfo_T *spin, char_u *word, int flags, int region, char_u *pfxlist, int need_affix);
+static int tree_add_word(spellinfo_T *spin, char_u *word, wordnode_T *tree, int flags, int region, int affixID);
+static wordnode_T *get_wordnode(spellinfo_T *spin);
+static int deref_wordnode(spellinfo_T *spin, wordnode_T *node);
+static void free_wordnode(spellinfo_T *spin, wordnode_T *n);
+static void wordtree_compress(spellinfo_T *spin, wordnode_T *root);
+static int node_compress(spellinfo_T *spin, wordnode_T *node, hashtab_T *ht, int *tot);
+static int node_equal(wordnode_T *n1, wordnode_T *n2);
+static int write_vim_spell(spellinfo_T *spin, char_u *fname);
+static void clear_node(wordnode_T *node);
+static int put_node(FILE *fd, wordnode_T *node, int idx, int regionmask, int prefixtree);
+static void spell_make_sugfile(spellinfo_T *spin, char_u *wfname);
+static int sug_filltree(spellinfo_T *spin, slang_T *slang);
+static int sug_maketable(spellinfo_T *spin);
+static int sug_filltable(spellinfo_T *spin, wordnode_T *node, int startwordnr, garray_T *gap);
+static int offset2bytes(int nr, char_u *buf);
+static void sug_write(spellinfo_T *spin, char_u *fname);
+static void spell_message(spellinfo_T *spin, char_u *str);
+static void init_spellfile(void);
+
+/* In the postponed prefixes tree wn_flags is used to store the WFP_ flags,
+ * but it must be negative to indicate the prefix tree to tree_add_word().
+ * Use a negative number with the lower 8 bits zero. */
+#define PFX_FLAGS	-256
+
+/* flags for "condit" argument of store_aff_word() */
+#define CONDIT_COMB	1	/* affix must combine */
+#define CONDIT_CFIX	2	/* affix must have CIRCUMFIX flag */
+#define CONDIT_SUF	4	/* add a suffix for matching flags */
+#define CONDIT_AFF	8	/* word already has an affix */
+
+/*
+ * Tunable parameters for when the tree is compressed.  See 'mkspellmem'.
+ */
+static long compress_start = 30000;	/* memory / SBLOCKSIZE */
+static long compress_inc = 100;		/* memory / SBLOCKSIZE */
+static long compress_added = 500000;	/* word count */
+
+/*
+ * Check the 'mkspellmem' option.  Return FAIL if it's wrong.
+ * Sets "sps_flags".
+ */
+    int
+spell_check_msm(void)
+{
+    char_u	*p = p_msm;
+    long	start = 0;
+    long	incr = 0;
+    long	added = 0;
+
+    if (!VIM_ISDIGIT(*p))
+	return FAIL;
+    /* block count = (value * 1024) / SBLOCKSIZE (but avoid overflow)*/
+    start = (getdigits(&p) * 10) / (SBLOCKSIZE / 102);
+    if (*p != ',')
+	return FAIL;
+    ++p;
+    if (!VIM_ISDIGIT(*p))
+	return FAIL;
+    incr = (getdigits(&p) * 102) / (SBLOCKSIZE / 10);
+    if (*p != ',')
+	return FAIL;
+    ++p;
+    if (!VIM_ISDIGIT(*p))
+	return FAIL;
+    added = getdigits(&p) * 1024;
+    if (*p != NUL)
+	return FAIL;
+
+    if (start == 0 || incr == 0 || added == 0 || incr > start)
+	return FAIL;
+
+    compress_start = start;
+    compress_inc = incr;
+    compress_added = added;
+    return OK;
+}
+
+#ifdef SPELL_PRINTTREE
+/*
+ * For debugging the tree code: print the current tree in a (more or less)
+ * readable format, so that we can see what happens when adding a word and/or
+ * compressing the tree.
+ * Based on code from Olaf Seibert.
+ */
+#define PRINTLINESIZE	1000
+#define PRINTWIDTH	6
+
+#define PRINTSOME(l, depth, fmt, a1, a2) vim_snprintf(l + depth * PRINTWIDTH, \
+	    PRINTLINESIZE - PRINTWIDTH * depth, fmt, a1, a2)
+
+static char line1[PRINTLINESIZE];
+static char line2[PRINTLINESIZE];
+static char line3[PRINTLINESIZE];
+
+    static void
+spell_clear_flags(wordnode_T *node)
+{
+    wordnode_T	*np;
+
+    for (np = node; np != NULL; np = np->wn_sibling)
+    {
+	np->wn_u1.index = FALSE;
+	spell_clear_flags(np->wn_child);
+    }
+}
+
+    static void
+spell_print_node(wordnode_T *node, int depth)
+{
+    if (node->wn_u1.index)
+    {
+	/* Done this node before, print the reference. */
+	PRINTSOME(line1, depth, "(%d)", node->wn_nr, 0);
+	PRINTSOME(line2, depth, "    ", 0, 0);
+	PRINTSOME(line3, depth, "    ", 0, 0);
+	msg((char_u *)line1);
+	msg((char_u *)line2);
+	msg((char_u *)line3);
+    }
+    else
+    {
+	node->wn_u1.index = TRUE;
+
+	if (node->wn_byte != NUL)
+	{
+	    if (node->wn_child != NULL)
+		PRINTSOME(line1, depth, " %c -> ", node->wn_byte, 0);
+	    else
+		/* Cannot happen? */
+		PRINTSOME(line1, depth, " %c ???", node->wn_byte, 0);
+	}
+	else
+	    PRINTSOME(line1, depth, " $    ", 0, 0);
+
+	PRINTSOME(line2, depth, "%d/%d    ", node->wn_nr, node->wn_refs);
+
+	if (node->wn_sibling != NULL)
+	    PRINTSOME(line3, depth, " |    ", 0, 0);
+	else
+	    PRINTSOME(line3, depth, "      ", 0, 0);
+
+	if (node->wn_byte == NUL)
+	{
+	    msg((char_u *)line1);
+	    msg((char_u *)line2);
+	    msg((char_u *)line3);
+	}
+
+	/* do the children */
+	if (node->wn_byte != NUL && node->wn_child != NULL)
+	    spell_print_node(node->wn_child, depth + 1);
+
+	/* do the siblings */
+	if (node->wn_sibling != NULL)
+	{
+	    /* get rid of all parent details except | */
+	    STRCPY(line1, line3);
+	    STRCPY(line2, line3);
+	    spell_print_node(node->wn_sibling, depth);
+	}
+    }
+}
+
+    static void
+spell_print_tree(wordnode_T *root)
+{
+    if (root != NULL)
+    {
+	/* Clear the "wn_u1.index" fields, used to remember what has been
+	 * done. */
+	spell_clear_flags(root);
+
+	/* Recursively print the tree. */
+	spell_print_node(root, 0);
+    }
+}
+#endif /* SPELL_PRINTTREE */
+
+/*
+ * Read the affix file "fname".
+ * Returns an afffile_T, NULL for complete failure.
+ */
+    static afffile_T *
+spell_read_aff(spellinfo_T *spin, char_u *fname)
+{
+    FILE	*fd;
+    afffile_T	*aff;
+    char_u	rline[MAXLINELEN];
+    char_u	*line;
+    char_u	*pc = NULL;
+#define MAXITEMCNT  30
+    char_u	*(items[MAXITEMCNT]);
+    int		itemcnt;
+    char_u	*p;
+    int		lnum = 0;
+    affheader_T	*cur_aff = NULL;
+    int		did_postpone_prefix = FALSE;
+    int		aff_todo = 0;
+    hashtab_T	*tp;
+    char_u	*low = NULL;
+    char_u	*fol = NULL;
+    char_u	*upp = NULL;
+    int		do_rep;
+    int		do_repsal;
+    int		do_sal;
+    int		do_mapline;
+    int		found_map = FALSE;
+    hashitem_T	*hi;
+    int		l;
+    int		compminlen = 0;		/* COMPOUNDMIN value */
+    int		compsylmax = 0;		/* COMPOUNDSYLMAX value */
+    int		compoptions = 0;	/* COMP_ flags */
+    int		compmax = 0;		/* COMPOUNDWORDMAX value */
+    char_u	*compflags = NULL;	/* COMPOUNDFLAG and COMPOUNDRULE
+					   concatenated */
+    char_u	*midword = NULL;	/* MIDWORD value */
+    char_u	*syllable = NULL;	/* SYLLABLE value */
+    char_u	*sofofrom = NULL;	/* SOFOFROM value */
+    char_u	*sofoto = NULL;		/* SOFOTO value */
+
+    /*
+     * Open the file.
+     */
+    fd = mch_fopen((char *)fname, "r");
+    if (fd == NULL)
+    {
+	EMSG2(_(e_notopen), fname);
+	return NULL;
+    }
+
+    vim_snprintf((char *)IObuff, IOSIZE, _("Reading affix file %s ..."), fname);
+    spell_message(spin, IObuff);
+
+    /* Only do REP lines when not done in another .aff file already. */
+    do_rep = spin->si_rep.ga_len == 0;
+
+    /* Only do REPSAL lines when not done in another .aff file already. */
+    do_repsal = spin->si_repsal.ga_len == 0;
+
+    /* Only do SAL lines when not done in another .aff file already. */
+    do_sal = spin->si_sal.ga_len == 0;
+
+    /* Only do MAP lines when not done in another .aff file already. */
+    do_mapline = spin->si_map.ga_len == 0;
+
+    /*
+     * Allocate and init the afffile_T structure.
+     */
+    aff = (afffile_T *)getroom(spin, sizeof(afffile_T), TRUE);
+    if (aff == NULL)
+    {
+	fclose(fd);
+	return NULL;
+    }
+    hash_init(&aff->af_pref);
+    hash_init(&aff->af_suff);
+    hash_init(&aff->af_comp);
+
+    /*
+     * Read all the lines in the file one by one.
+     */
+    while (!vim_fgets(rline, MAXLINELEN, fd) && !got_int)
+    {
+	line_breakcheck();
+	++lnum;
+
+	/* Skip comment lines. */
+	if (*rline == '#')
+	    continue;
+
+	/* Convert from "SET" to 'encoding' when needed. */
+	vim_free(pc);
+#ifdef FEAT_MBYTE
+	if (spin->si_conv.vc_type != CONV_NONE)
+	{
+	    pc = string_convert(&spin->si_conv, rline, NULL);
+	    if (pc == NULL)
+	    {
+		smsg((char_u *)_("Conversion failure for word in %s line %d: %s"),
+							   fname, lnum, rline);
+		continue;
+	    }
+	    line = pc;
+	}
+	else
+#endif
+	{
+	    pc = NULL;
+	    line = rline;
+	}
+
+	/* Split the line up in white separated items.  Put a NUL after each
+	 * item. */
+	itemcnt = 0;
+	for (p = line; ; )
+	{
+	    while (*p != NUL && *p <= ' ')  /* skip white space and CR/NL */
+		++p;
+	    if (*p == NUL)
+		break;
+	    if (itemcnt == MAXITEMCNT)	    /* too many items */
+		break;
+	    items[itemcnt++] = p;
+	    /* A few items have arbitrary text argument, don't split them. */
+	    if (itemcnt == 2 && spell_info_item(items[0]))
+		while (*p >= ' ' || *p == TAB)    /* skip until CR/NL */
+		    ++p;
+	    else
+		while (*p > ' ')    /* skip until white space or CR/NL */
+		    ++p;
+	    if (*p == NUL)
+		break;
+	    *p++ = NUL;
+	}
+
+	/* Handle non-empty lines. */
+	if (itemcnt > 0)
+	{
+	    if (is_aff_rule(items, itemcnt, "SET", 2) && aff->af_enc == NULL)
+	    {
+#ifdef FEAT_MBYTE
+		/* Setup for conversion from "ENC" to 'encoding'. */
+		aff->af_enc = enc_canonize(items[1]);
+		if (aff->af_enc != NULL && !spin->si_ascii
+			&& convert_setup(&spin->si_conv, aff->af_enc,
+							       p_enc) == FAIL)
+		    smsg((char_u *)_("Conversion in %s not supported: from %s to %s"),
+					       fname, aff->af_enc, p_enc);
+		spin->si_conv.vc_fail = TRUE;
+#else
+		    smsg((char_u *)_("Conversion in %s not supported"), fname);
+#endif
+	    }
+	    else if (is_aff_rule(items, itemcnt, "FLAG", 2)
+					      && aff->af_flagtype == AFT_CHAR)
+	    {
+		if (STRCMP(items[1], "long") == 0)
+		    aff->af_flagtype = AFT_LONG;
+		else if (STRCMP(items[1], "num") == 0)
+		    aff->af_flagtype = AFT_NUM;
+		else if (STRCMP(items[1], "caplong") == 0)
+		    aff->af_flagtype = AFT_CAPLONG;
+		else
+		    smsg((char_u *)_("Invalid value for FLAG in %s line %d: %s"),
+			    fname, lnum, items[1]);
+		if (aff->af_rare != 0
+			|| aff->af_keepcase != 0
+			|| aff->af_bad != 0
+			|| aff->af_needaffix != 0
+			|| aff->af_circumfix != 0
+			|| aff->af_needcomp != 0
+			|| aff->af_comproot != 0
+			|| aff->af_nosuggest != 0
+			|| compflags != NULL
+			|| aff->af_suff.ht_used > 0
+			|| aff->af_pref.ht_used > 0)
+		    smsg((char_u *)_("FLAG after using flags in %s line %d: %s"),
+			    fname, lnum, items[1]);
+	    }
+	    else if (spell_info_item(items[0]))
+	    {
+		    p = (char_u *)getroom(spin,
+			    (spin->si_info == NULL ? 0 : STRLEN(spin->si_info))
+			    + STRLEN(items[0])
+			    + STRLEN(items[1]) + 3, FALSE);
+		    if (p != NULL)
+		    {
+			if (spin->si_info != NULL)
+			{
+			    STRCPY(p, spin->si_info);
+			    STRCAT(p, "\n");
+			}
+			STRCAT(p, items[0]);
+			STRCAT(p, " ");
+			STRCAT(p, items[1]);
+			spin->si_info = p;
+		    }
+	    }
+	    else if (is_aff_rule(items, itemcnt, "MIDWORD", 2)
+							   && midword == NULL)
+	    {
+		midword = getroom_save(spin, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "TRY", 2))
+	    {
+		/* ignored, we look in the tree for what chars may appear */
+	    }
+	    /* TODO: remove "RAR" later */
+	    else if ((is_aff_rule(items, itemcnt, "RAR", 2)
+			|| is_aff_rule(items, itemcnt, "RARE", 2))
+							 && aff->af_rare == 0)
+	    {
+		aff->af_rare = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    /* TODO: remove "KEP" later */
+	    else if ((is_aff_rule(items, itemcnt, "KEP", 2)
+			|| is_aff_rule(items, itemcnt, "KEEPCASE", 2))
+						     && aff->af_keepcase == 0)
+	    {
+		aff->af_keepcase = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if ((is_aff_rule(items, itemcnt, "BAD", 2)
+			|| is_aff_rule(items, itemcnt, "FORBIDDENWORD", 2))
+							  && aff->af_bad == 0)
+	    {
+		aff->af_bad = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NEEDAFFIX", 2)
+						    && aff->af_needaffix == 0)
+	    {
+		aff->af_needaffix = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CIRCUMFIX", 2)
+						    && aff->af_circumfix == 0)
+	    {
+		aff->af_circumfix = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NOSUGGEST", 2)
+						    && aff->af_nosuggest == 0)
+	    {
+		aff->af_nosuggest = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if ((is_aff_rule(items, itemcnt, "NEEDCOMPOUND", 2)
+			|| is_aff_rule(items, itemcnt, "ONLYINCOMPOUND", 2))
+						     && aff->af_needcomp == 0)
+	    {
+		aff->af_needcomp = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDROOT", 2)
+						     && aff->af_comproot == 0)
+	    {
+		aff->af_comproot = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDFORBIDFLAG", 2)
+						   && aff->af_compforbid == 0)
+	    {
+		aff->af_compforbid = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+		if (aff->af_pref.ht_used > 0)
+		    smsg((char_u *)_("Defining COMPOUNDFORBIDFLAG after PFX item may give wrong results in %s line %d"),
+			    fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDPERMITFLAG", 2)
+						   && aff->af_comppermit == 0)
+	    {
+		aff->af_comppermit = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+		if (aff->af_pref.ht_used > 0)
+		    smsg((char_u *)_("Defining COMPOUNDPERMITFLAG after PFX item may give wrong results in %s line %d"),
+			    fname, lnum);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDFLAG", 2)
+							 && compflags == NULL)
+	    {
+		/* Turn flag "c" into COMPOUNDRULE compatible string "c+",
+		 * "Na" into "Na+", "1234" into "1234+". */
+		p = getroom(spin, STRLEN(items[1]) + 2, FALSE);
+		if (p != NULL)
+		{
+		    STRCPY(p, items[1]);
+		    STRCAT(p, "+");
+		    compflags = p;
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDRULES", 2))
+	    {
+		/* We don't use the count, but do check that it's a number and
+		 * not COMPOUNDRULE mistyped. */
+		if (atoi((char *)items[1]) == 0)
+		    smsg((char_u *)_("Wrong COMPOUNDRULES value in %s line %d: %s"),
+						       fname, lnum, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDRULE", 2))
+	    {
+		/* Don't use the first rule if it is a number. */
+		if (compflags != NULL || *skipdigits(items[1]) != NUL)
+		{
+		    /* Concatenate this string to previously defined ones,
+		     * using a slash to separate them. */
+		    l = (int)STRLEN(items[1]) + 1;
+		    if (compflags != NULL)
+			l += (int)STRLEN(compflags) + 1;
+		    p = getroom(spin, l, FALSE);
+		    if (p != NULL)
+		    {
+			if (compflags != NULL)
+			{
+			    STRCPY(p, compflags);
+			    STRCAT(p, "/");
+			}
+			STRCAT(p, items[1]);
+			compflags = p;
+		    }
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDWORDMAX", 2)
+							      && compmax == 0)
+	    {
+		compmax = atoi((char *)items[1]);
+		if (compmax == 0)
+		    smsg((char_u *)_("Wrong COMPOUNDWORDMAX value in %s line %d: %s"),
+						       fname, lnum, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDMIN", 2)
+							   && compminlen == 0)
+	    {
+		compminlen = atoi((char *)items[1]);
+		if (compminlen == 0)
+		    smsg((char_u *)_("Wrong COMPOUNDMIN value in %s line %d: %s"),
+						       fname, lnum, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "COMPOUNDSYLMAX", 2)
+							   && compsylmax == 0)
+	    {
+		compsylmax = atoi((char *)items[1]);
+		if (compsylmax == 0)
+		    smsg((char_u *)_("Wrong COMPOUNDSYLMAX value in %s line %d: %s"),
+						       fname, lnum, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDDUP", 1))
+	    {
+		compoptions |= COMP_CHECKDUP;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDREP", 1))
+	    {
+		compoptions |= COMP_CHECKREP;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDCASE", 1))
+	    {
+		compoptions |= COMP_CHECKCASE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDTRIPLE", 1))
+	    {
+		compoptions |= COMP_CHECKTRIPLE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDPATTERN", 2))
+	    {
+		if (atoi((char *)items[1]) == 0)
+		    smsg((char_u *)_("Wrong CHECKCOMPOUNDPATTERN value in %s line %d: %s"),
+						       fname, lnum, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "CHECKCOMPOUNDPATTERN", 3))
+	    {
+		garray_T    *gap = &spin->si_comppat;
+		int	    i;
+
+		/* Only add the couple if it isn't already there. */
+		for (i = 0; i < gap->ga_len - 1; i += 2)
+		    if (STRCMP(((char_u **)(gap->ga_data))[i], items[1]) == 0
+			    && STRCMP(((char_u **)(gap->ga_data))[i + 1],
+							       items[2]) == 0)
+			break;
+		if (i >= gap->ga_len && ga_grow(gap, 2) == OK)
+		{
+		    ((char_u **)(gap->ga_data))[gap->ga_len++]
+					       = getroom_save(spin, items[1]);
+		    ((char_u **)(gap->ga_data))[gap->ga_len++]
+					       = getroom_save(spin, items[2]);
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "SYLLABLE", 2)
+							  && syllable == NULL)
+	    {
+		syllable = getroom_save(spin, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NOBREAK", 1))
+	    {
+		spin->si_nobreak = TRUE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NOSPLITSUGS", 1))
+	    {
+		spin->si_nosplitsugs = TRUE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NOCOMPOUNDSUGS", 1))
+	    {
+		spin->si_nocompoundsugs = TRUE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "NOSUGFILE", 1))
+	    {
+		spin->si_nosugfile = TRUE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "PFXPOSTPONE", 1))
+	    {
+		aff->af_pfxpostpone = TRUE;
+	    }
+	    else if (is_aff_rule(items, itemcnt, "IGNOREEXTRA", 1))
+	    {
+		aff->af_ignoreextra = TRUE;
+	    }
+	    else if ((STRCMP(items[0], "PFX") == 0
+					      || STRCMP(items[0], "SFX") == 0)
+		    && aff_todo == 0
+		    && itemcnt >= 4)
+	    {
+		int	lasti = 4;
+		char_u	key[AH_KEY_LEN];
+
+		if (*items[0] == 'P')
+		    tp = &aff->af_pref;
+		else
+		    tp = &aff->af_suff;
+
+		/* Myspell allows the same affix name to be used multiple
+		 * times.  The affix files that do this have an undocumented
+		 * "S" flag on all but the last block, thus we check for that
+		 * and store it in ah_follows. */
+		vim_strncpy(key, items[1], AH_KEY_LEN - 1);
+		hi = hash_find(tp, key);
+		if (!HASHITEM_EMPTY(hi))
+		{
+		    cur_aff = HI2AH(hi);
+		    if (cur_aff->ah_combine != (*items[2] == 'Y'))
+			smsg((char_u *)_("Different combining flag in continued affix block in %s line %d: %s"),
+						   fname, lnum, items[1]);
+		    if (!cur_aff->ah_follows)
+			smsg((char_u *)_("Duplicate affix in %s line %d: %s"),
+						       fname, lnum, items[1]);
+		}
+		else
+		{
+		    /* New affix letter. */
+		    cur_aff = (affheader_T *)getroom(spin,
+						   sizeof(affheader_T), TRUE);
+		    if (cur_aff == NULL)
+			break;
+		    cur_aff->ah_flag = affitem2flag(aff->af_flagtype, items[1],
+								 fname, lnum);
+		    if (cur_aff->ah_flag == 0 || STRLEN(items[1]) >= AH_KEY_LEN)
+			break;
+		    if (cur_aff->ah_flag == aff->af_bad
+			    || cur_aff->ah_flag == aff->af_rare
+			    || cur_aff->ah_flag == aff->af_keepcase
+			    || cur_aff->ah_flag == aff->af_needaffix
+			    || cur_aff->ah_flag == aff->af_circumfix
+			    || cur_aff->ah_flag == aff->af_nosuggest
+			    || cur_aff->ah_flag == aff->af_needcomp
+			    || cur_aff->ah_flag == aff->af_comproot)
+			smsg((char_u *)_("Affix also used for BAD/RARE/KEEPCASE/NEEDAFFIX/NEEDCOMPOUND/NOSUGGEST in %s line %d: %s"),
+						       fname, lnum, items[1]);
+		    STRCPY(cur_aff->ah_key, items[1]);
+		    hash_add(tp, cur_aff->ah_key);
+
+		    cur_aff->ah_combine = (*items[2] == 'Y');
+		}
+
+		/* Check for the "S" flag, which apparently means that another
+		 * block with the same affix name is following. */
+		if (itemcnt > lasti && STRCMP(items[lasti], "S") == 0)
+		{
+		    ++lasti;
+		    cur_aff->ah_follows = TRUE;
+		}
+		else
+		    cur_aff->ah_follows = FALSE;
+
+		/* Myspell allows extra text after the item, but that might
+		 * mean mistakes go unnoticed.  Require a comment-starter. */
+		if (itemcnt > lasti && *items[lasti] != '#')
+		    smsg((char_u *)_(e_afftrailing), fname, lnum, items[lasti]);
+
+		if (STRCMP(items[2], "Y") != 0 && STRCMP(items[2], "N") != 0)
+		    smsg((char_u *)_("Expected Y or N in %s line %d: %s"),
+						       fname, lnum, items[2]);
+
+		if (*items[0] == 'P' && aff->af_pfxpostpone)
+		{
+		    if (cur_aff->ah_newID == 0)
+		    {
+			/* Use a new number in the .spl file later, to be able
+			 * to handle multiple .aff files. */
+			check_renumber(spin);
+			cur_aff->ah_newID = ++spin->si_newprefID;
+
+			/* We only really use ah_newID if the prefix is
+			 * postponed.  We know that only after handling all
+			 * the items. */
+			did_postpone_prefix = FALSE;
+		    }
+		    else
+			/* Did use the ID in a previous block. */
+			did_postpone_prefix = TRUE;
+		}
+
+		aff_todo = atoi((char *)items[3]);
+	    }
+	    else if ((STRCMP(items[0], "PFX") == 0
+					      || STRCMP(items[0], "SFX") == 0)
+		    && aff_todo > 0
+		    && STRCMP(cur_aff->ah_key, items[1]) == 0
+		    && itemcnt >= 5)
+	    {
+		affentry_T	*aff_entry;
+		int		upper = FALSE;
+		int		lasti = 5;
+
+		/* Myspell allows extra text after the item, but that might
+		 * mean mistakes go unnoticed.  Require a comment-starter,
+		 * unless IGNOREEXTRA is used.  Hunspell uses a "-" item. */
+		if (itemcnt > lasti
+			&& !aff->af_ignoreextra
+			&& *items[lasti] != '#'
+			&& (STRCMP(items[lasti], "-") != 0
+						     || itemcnt != lasti + 1))
+		    smsg((char_u *)_(e_afftrailing), fname, lnum, items[lasti]);
+
+		/* New item for an affix letter. */
+		--aff_todo;
+		aff_entry = (affentry_T *)getroom(spin,
+						    sizeof(affentry_T), TRUE);
+		if (aff_entry == NULL)
+		    break;
+
+		if (STRCMP(items[2], "0") != 0)
+		    aff_entry->ae_chop = getroom_save(spin, items[2]);
+		if (STRCMP(items[3], "0") != 0)
+		{
+		    aff_entry->ae_add = getroom_save(spin, items[3]);
+
+		    /* Recognize flags on the affix: abcd/XYZ */
+		    aff_entry->ae_flags = vim_strchr(aff_entry->ae_add, '/');
+		    if (aff_entry->ae_flags != NULL)
+		    {
+			*aff_entry->ae_flags++ = NUL;
+			aff_process_flags(aff, aff_entry);
+		    }
+		}
+
+		/* Don't use an affix entry with non-ASCII characters when
+		 * "spin->si_ascii" is TRUE. */
+		if (!spin->si_ascii || !(has_non_ascii(aff_entry->ae_chop)
+					  || has_non_ascii(aff_entry->ae_add)))
+		{
+		    aff_entry->ae_next = cur_aff->ah_first;
+		    cur_aff->ah_first = aff_entry;
+
+		    if (STRCMP(items[4], ".") != 0)
+		    {
+			char_u	buf[MAXLINELEN];
+
+			aff_entry->ae_cond = getroom_save(spin, items[4]);
+			if (*items[0] == 'P')
+			    sprintf((char *)buf, "^%s", items[4]);
+			else
+			    sprintf((char *)buf, "%s$", items[4]);
+			aff_entry->ae_prog = vim_regcomp(buf,
+					    RE_MAGIC + RE_STRING + RE_STRICT);
+			if (aff_entry->ae_prog == NULL)
+			    smsg((char_u *)_("Broken condition in %s line %d: %s"),
+						       fname, lnum, items[4]);
+		    }
+
+		    /* For postponed prefixes we need an entry in si_prefcond
+		     * for the condition.  Use an existing one if possible.
+		     * Can't be done for an affix with flags, ignoring
+		     * COMPOUNDFORBIDFLAG and COMPOUNDPERMITFLAG. */
+		    if (*items[0] == 'P' && aff->af_pfxpostpone
+					       && aff_entry->ae_flags == NULL)
+		    {
+			/* When the chop string is one lower-case letter and
+			 * the add string ends in the upper-case letter we set
+			 * the "upper" flag, clear "ae_chop" and remove the
+			 * letters from "ae_add".  The condition must either
+			 * be empty or start with the same letter. */
+			if (aff_entry->ae_chop != NULL
+				&& aff_entry->ae_add != NULL
+#ifdef FEAT_MBYTE
+				&& aff_entry->ae_chop[(*mb_ptr2len)(
+						   aff_entry->ae_chop)] == NUL
+#else
+				&& aff_entry->ae_chop[1] == NUL
+#endif
+				)
+			{
+			    int		c, c_up;
+
+			    c = PTR2CHAR(aff_entry->ae_chop);
+			    c_up = SPELL_TOUPPER(c);
+			    if (c_up != c
+				    && (aff_entry->ae_cond == NULL
+					|| PTR2CHAR(aff_entry->ae_cond) == c))
+			    {
+				p = aff_entry->ae_add
+						  + STRLEN(aff_entry->ae_add);
+				mb_ptr_back(aff_entry->ae_add, p);
+				if (PTR2CHAR(p) == c_up)
+				{
+				    upper = TRUE;
+				    aff_entry->ae_chop = NULL;
+				    *p = NUL;
+
+				    /* The condition is matched with the
+				     * actual word, thus must check for the
+				     * upper-case letter. */
+				    if (aff_entry->ae_cond != NULL)
+				    {
+					char_u	buf[MAXLINELEN];
+#ifdef FEAT_MBYTE
+					if (has_mbyte)
+					{
+					    onecap_copy(items[4], buf, TRUE);
+					    aff_entry->ae_cond = getroom_save(
+								   spin, buf);
+					}
+					else
+#endif
+					    *aff_entry->ae_cond = c_up;
+					if (aff_entry->ae_cond != NULL)
+					{
+					    sprintf((char *)buf, "^%s",
+							  aff_entry->ae_cond);
+					    vim_regfree(aff_entry->ae_prog);
+					    aff_entry->ae_prog = vim_regcomp(
+						    buf, RE_MAGIC + RE_STRING);
+					}
+				    }
+				}
+			    }
+			}
+
+			if (aff_entry->ae_chop == NULL
+					       && aff_entry->ae_flags == NULL)
+			{
+			    int		idx;
+			    char_u	**pp;
+			    int		n;
+
+			    /* Find a previously used condition. */
+			    for (idx = spin->si_prefcond.ga_len - 1; idx >= 0;
+									--idx)
+			    {
+				p = ((char_u **)spin->si_prefcond.ga_data)[idx];
+				if (str_equal(p, aff_entry->ae_cond))
+				    break;
+			    }
+			    if (idx < 0 && ga_grow(&spin->si_prefcond, 1) == OK)
+			    {
+				/* Not found, add a new condition. */
+				idx = spin->si_prefcond.ga_len++;
+				pp = ((char_u **)spin->si_prefcond.ga_data)
+									+ idx;
+				if (aff_entry->ae_cond == NULL)
+				    *pp = NULL;
+				else
+				    *pp = getroom_save(spin,
+							  aff_entry->ae_cond);
+			    }
+
+			    /* Add the prefix to the prefix tree. */
+			    if (aff_entry->ae_add == NULL)
+				p = (char_u *)"";
+			    else
+				p = aff_entry->ae_add;
+
+			    /* PFX_FLAGS is a negative number, so that
+			     * tree_add_word() knows this is the prefix tree. */
+			    n = PFX_FLAGS;
+			    if (!cur_aff->ah_combine)
+				n |= WFP_NC;
+			    if (upper)
+				n |= WFP_UP;
+			    if (aff_entry->ae_comppermit)
+				n |= WFP_COMPPERMIT;
+			    if (aff_entry->ae_compforbid)
+				n |= WFP_COMPFORBID;
+			    tree_add_word(spin, p, spin->si_prefroot, n,
+						      idx, cur_aff->ah_newID);
+			    did_postpone_prefix = TRUE;
+			}
+
+			/* Didn't actually use ah_newID, backup si_newprefID. */
+			if (aff_todo == 0 && !did_postpone_prefix)
+			{
+			    --spin->si_newprefID;
+			    cur_aff->ah_newID = 0;
+			}
+		    }
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "FOL", 2) && fol == NULL)
+	    {
+		fol = vim_strsave(items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "LOW", 2) && low == NULL)
+	    {
+		low = vim_strsave(items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "UPP", 2) && upp == NULL)
+	    {
+		upp = vim_strsave(items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "REP", 2)
+		     || is_aff_rule(items, itemcnt, "REPSAL", 2))
+	    {
+		/* Ignore REP/REPSAL count */;
+		if (!isdigit(*items[1]))
+		    smsg((char_u *)_("Expected REP(SAL) count in %s line %d"),
+								 fname, lnum);
+	    }
+	    else if ((STRCMP(items[0], "REP") == 0
+			|| STRCMP(items[0], "REPSAL") == 0)
+		    && itemcnt >= 3)
+	    {
+		/* REP/REPSAL item */
+		/* Myspell ignores extra arguments, we require it starts with
+		 * # to detect mistakes. */
+		if (itemcnt > 3 && items[3][0] != '#')
+		    smsg((char_u *)_(e_afftrailing), fname, lnum, items[3]);
+		if (items[0][3] == 'S' ? do_repsal : do_rep)
+		{
+		    /* Replace underscore with space (can't include a space
+		     * directly). */
+		    for (p = items[1]; *p != NUL; mb_ptr_adv(p))
+			if (*p == '_')
+			    *p = ' ';
+		    for (p = items[2]; *p != NUL; mb_ptr_adv(p))
+			if (*p == '_')
+			    *p = ' ';
+		    add_fromto(spin, items[0][3] == 'S'
+					 ? &spin->si_repsal
+					 : &spin->si_rep, items[1], items[2]);
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "MAP", 2))
+	    {
+		/* MAP item or count */
+		if (!found_map)
+		{
+		    /* First line contains the count. */
+		    found_map = TRUE;
+		    if (!isdigit(*items[1]))
+			smsg((char_u *)_("Expected MAP count in %s line %d"),
+								 fname, lnum);
+		}
+		else if (do_mapline)
+		{
+		    int		c;
+
+		    /* Check that every character appears only once. */
+		    for (p = items[1]; *p != NUL; )
+		    {
+#ifdef FEAT_MBYTE
+			c = mb_ptr2char_adv(&p);
+#else
+			c = *p++;
+#endif
+			if ((spin->si_map.ga_len > 0
+				    && vim_strchr(spin->si_map.ga_data, c)
+								      != NULL)
+				|| vim_strchr(p, c) != NULL)
+			    smsg((char_u *)_("Duplicate character in MAP in %s line %d"),
+								 fname, lnum);
+		    }
+
+		    /* We simply concatenate all the MAP strings, separated by
+		     * slashes. */
+		    ga_concat(&spin->si_map, items[1]);
+		    ga_append(&spin->si_map, '/');
+		}
+	    }
+	    /* Accept "SAL from to" and "SAL from to  #comment". */
+	    else if (is_aff_rule(items, itemcnt, "SAL", 3))
+	    {
+		if (do_sal)
+		{
+		    /* SAL item (sounds-a-like)
+		     * Either one of the known keys or a from-to pair. */
+		    if (STRCMP(items[1], "followup") == 0)
+			spin->si_followup = sal_to_bool(items[2]);
+		    else if (STRCMP(items[1], "collapse_result") == 0)
+			spin->si_collapse = sal_to_bool(items[2]);
+		    else if (STRCMP(items[1], "remove_accents") == 0)
+			spin->si_rem_accents = sal_to_bool(items[2]);
+		    else
+			/* when "to" is "_" it means empty */
+			add_fromto(spin, &spin->si_sal, items[1],
+				     STRCMP(items[2], "_") == 0 ? (char_u *)""
+								: items[2]);
+		}
+	    }
+	    else if (is_aff_rule(items, itemcnt, "SOFOFROM", 2)
+							  && sofofrom == NULL)
+	    {
+		sofofrom = getroom_save(spin, items[1]);
+	    }
+	    else if (is_aff_rule(items, itemcnt, "SOFOTO", 2)
+							    && sofoto == NULL)
+	    {
+		sofoto = getroom_save(spin, items[1]);
+	    }
+	    else if (STRCMP(items[0], "COMMON") == 0)
+	    {
+		int	i;
+
+		for (i = 1; i < itemcnt; ++i)
+		{
+		    if (HASHITEM_EMPTY(hash_find(&spin->si_commonwords,
+								   items[i])))
+		    {
+			p = vim_strsave(items[i]);
+			if (p == NULL)
+			    break;
+			hash_add(&spin->si_commonwords, p);
+		    }
+		}
+	    }
+	    else
+		smsg((char_u *)_("Unrecognized or duplicate item in %s line %d: %s"),
+						       fname, lnum, items[0]);
+	}
+    }
+
+    if (fol != NULL || low != NULL || upp != NULL)
+    {
+	if (spin->si_clear_chartab)
+	{
+	    /* Clear the char type tables, don't want to use any of the
+	     * currently used spell properties. */
+	    init_spell_chartab();
+	    spin->si_clear_chartab = FALSE;
+	}
+
+	/*
+	 * Don't write a word table for an ASCII file, so that we don't check
+	 * for conflicts with a word table that matches 'encoding'.
+	 * Don't write one for utf-8 either, we use utf_*() and
+	 * mb_get_class(), the list of chars in the file will be incomplete.
+	 */
+	if (!spin->si_ascii
+#ifdef FEAT_MBYTE
+		&& !enc_utf8
+#endif
+		)
+	{
+	    if (fol == NULL || low == NULL || upp == NULL)
+		smsg((char_u *)_("Missing FOL/LOW/UPP line in %s"), fname);
+	    else
+		(void)set_spell_chartab(fol, low, upp);
+	}
+
+	vim_free(fol);
+	vim_free(low);
+	vim_free(upp);
+    }
+
+    /* Use compound specifications of the .aff file for the spell info. */
+    if (compmax != 0)
+    {
+	aff_check_number(spin->si_compmax, compmax, "COMPOUNDWORDMAX");
+	spin->si_compmax = compmax;
+    }
+
+    if (compminlen != 0)
+    {
+	aff_check_number(spin->si_compminlen, compminlen, "COMPOUNDMIN");
+	spin->si_compminlen = compminlen;
+    }
+
+    if (compsylmax != 0)
+    {
+	if (syllable == NULL)
+	    smsg((char_u *)_("COMPOUNDSYLMAX used without SYLLABLE"));
+	aff_check_number(spin->si_compsylmax, compsylmax, "COMPOUNDSYLMAX");
+	spin->si_compsylmax = compsylmax;
+    }
+
+    if (compoptions != 0)
+    {
+	aff_check_number(spin->si_compoptions, compoptions, "COMPOUND options");
+	spin->si_compoptions |= compoptions;
+    }
+
+    if (compflags != NULL)
+	process_compflags(spin, aff, compflags);
+
+    /* Check that we didn't use too many renumbered flags. */
+    if (spin->si_newcompID < spin->si_newprefID)
+    {
+	if (spin->si_newcompID == 127 || spin->si_newcompID == 255)
+	    MSG(_("Too many postponed prefixes"));
+	else if (spin->si_newprefID == 0 || spin->si_newprefID == 127)
+	    MSG(_("Too many compound flags"));
+	else
+	    MSG(_("Too many postponed prefixes and/or compound flags"));
+    }
+
+    if (syllable != NULL)
+    {
+	aff_check_string(spin->si_syllable, syllable, "SYLLABLE");
+	spin->si_syllable = syllable;
+    }
+
+    if (sofofrom != NULL || sofoto != NULL)
+    {
+	if (sofofrom == NULL || sofoto == NULL)
+	    smsg((char_u *)_("Missing SOFO%s line in %s"),
+				     sofofrom == NULL ? "FROM" : "TO", fname);
+	else if (spin->si_sal.ga_len > 0)
+	    smsg((char_u *)_("Both SAL and SOFO lines in %s"), fname);
+	else
+	{
+	    aff_check_string(spin->si_sofofr, sofofrom, "SOFOFROM");
+	    aff_check_string(spin->si_sofoto, sofoto, "SOFOTO");
+	    spin->si_sofofr = sofofrom;
+	    spin->si_sofoto = sofoto;
+	}
+    }
+
+    if (midword != NULL)
+    {
+	aff_check_string(spin->si_midword, midword, "MIDWORD");
+	spin->si_midword = midword;
+    }
+
+    vim_free(pc);
+    fclose(fd);
+    return aff;
+}
+
+/*
+ * Return TRUE when items[0] equals "rulename", there are "mincount" items or
+ * a comment is following after item "mincount".
+ */
+    static int
+is_aff_rule(
+    char_u	**items,
+    int		itemcnt,
+    char	*rulename,
+    int		mincount)
+{
+    return (STRCMP(items[0], rulename) == 0
+	    && (itemcnt == mincount
+		|| (itemcnt > mincount && items[mincount][0] == '#')));
+}
+
+/*
+ * For affix "entry" move COMPOUNDFORBIDFLAG and COMPOUNDPERMITFLAG from
+ * ae_flags to ae_comppermit and ae_compforbid.
+ */
+    static void
+aff_process_flags(afffile_T *affile, affentry_T *entry)
+{
+    char_u	*p;
+    char_u	*prevp;
+    unsigned	flag;
+
+    if (entry->ae_flags != NULL
+		&& (affile->af_compforbid != 0 || affile->af_comppermit != 0))
+    {
+	for (p = entry->ae_flags; *p != NUL; )
+	{
+	    prevp = p;
+	    flag = get_affitem(affile->af_flagtype, &p);
+	    if (flag == affile->af_comppermit || flag == affile->af_compforbid)
+	    {
+		STRMOVE(prevp, p);
+		p = prevp;
+		if (flag == affile->af_comppermit)
+		    entry->ae_comppermit = TRUE;
+		else
+		    entry->ae_compforbid = TRUE;
+	    }
+	    if (affile->af_flagtype == AFT_NUM && *p == ',')
+		++p;
+	}
+	if (*entry->ae_flags == NUL)
+	    entry->ae_flags = NULL;	/* nothing left */
+    }
+}
+
+/*
+ * Return TRUE if "s" is the name of an info item in the affix file.
+ */
+    static int
+spell_info_item(char_u *s)
+{
+    return STRCMP(s, "NAME") == 0
+	|| STRCMP(s, "HOME") == 0
+	|| STRCMP(s, "VERSION") == 0
+	|| STRCMP(s, "AUTHOR") == 0
+	|| STRCMP(s, "EMAIL") == 0
+	|| STRCMP(s, "COPYRIGHT") == 0;
+}
+
+/*
+ * Turn an affix flag name into a number, according to the FLAG type.
+ * returns zero for failure.
+ */
+    static unsigned
+affitem2flag(
+    int		flagtype,
+    char_u	*item,
+    char_u	*fname,
+    int		lnum)
+{
+    unsigned	res;
+    char_u	*p = item;
+
+    res = get_affitem(flagtype, &p);
+    if (res == 0)
+    {
+	if (flagtype == AFT_NUM)
+	    smsg((char_u *)_("Flag is not a number in %s line %d: %s"),
+							   fname, lnum, item);
+	else
+	    smsg((char_u *)_("Illegal flag in %s line %d: %s"),
+							   fname, lnum, item);
+    }
+    if (*p != NUL)
+    {
+	smsg((char_u *)_(e_affname), fname, lnum, item);
+	return 0;
+    }
+
+    return res;
+}
+
+/*
+ * Get one affix name from "*pp" and advance the pointer.
+ * Returns zero for an error, still advances the pointer then.
+ */
+    static unsigned
+get_affitem(int flagtype, char_u **pp)
+{
+    int		res;
+
+    if (flagtype == AFT_NUM)
+    {
+	if (!VIM_ISDIGIT(**pp))
+	{
+	    ++*pp;	/* always advance, avoid getting stuck */
+	    return 0;
+	}
+	res = getdigits(pp);
+    }
+    else
+    {
+#ifdef FEAT_MBYTE
+	res = mb_ptr2char_adv(pp);
+#else
+	res = *(*pp)++;
+#endif
+	if (flagtype == AFT_LONG || (flagtype == AFT_CAPLONG
+						 && res >= 'A' && res <= 'Z'))
+	{
+	    if (**pp == NUL)
+		return 0;
+#ifdef FEAT_MBYTE
+	    res = mb_ptr2char_adv(pp) + (res << 16);
+#else
+	    res = *(*pp)++ + (res << 16);
+#endif
+	}
+    }
+    return res;
+}
+
+/*
+ * Process the "compflags" string used in an affix file and append it to
+ * spin->si_compflags.
+ * The processing involves changing the affix names to ID numbers, so that
+ * they fit in one byte.
+ */
+    static void
+process_compflags(
+    spellinfo_T	*spin,
+    afffile_T	*aff,
+    char_u	*compflags)
+{
+    char_u	*p;
+    char_u	*prevp;
+    unsigned	flag;
+    compitem_T	*ci;
+    int		id;
+    int		len;
+    char_u	*tp;
+    char_u	key[AH_KEY_LEN];
+    hashitem_T	*hi;
+
+    /* Make room for the old and the new compflags, concatenated with a / in
+     * between.  Processing it makes it shorter, but we don't know by how
+     * much, thus allocate the maximum. */
+    len = (int)STRLEN(compflags) + 1;
+    if (spin->si_compflags != NULL)
+	len += (int)STRLEN(spin->si_compflags) + 1;
+    p = getroom(spin, len, FALSE);
+    if (p == NULL)
+	return;
+    if (spin->si_compflags != NULL)
+    {
+	STRCPY(p, spin->si_compflags);
+	STRCAT(p, "/");
+    }
+    spin->si_compflags = p;
+    tp = p + STRLEN(p);
+
+    for (p = compflags; *p != NUL; )
+    {
+	if (vim_strchr((char_u *)"/?*+[]", *p) != NULL)
+	    /* Copy non-flag characters directly. */
+	    *tp++ = *p++;
+	else
+	{
+	    /* First get the flag number, also checks validity. */
+	    prevp = p;
+	    flag = get_affitem(aff->af_flagtype, &p);
+	    if (flag != 0)
+	    {
+		/* Find the flag in the hashtable.  If it was used before, use
+		 * the existing ID.  Otherwise add a new entry. */
+		vim_strncpy(key, prevp, p - prevp);
+		hi = hash_find(&aff->af_comp, key);
+		if (!HASHITEM_EMPTY(hi))
+		    id = HI2CI(hi)->ci_newID;
+		else
+		{
+		    ci = (compitem_T *)getroom(spin, sizeof(compitem_T), TRUE);
+		    if (ci == NULL)
+			break;
+		    STRCPY(ci->ci_key, key);
+		    ci->ci_flag = flag;
+		    /* Avoid using a flag ID that has a special meaning in a
+		     * regexp (also inside []). */
+		    do
+		    {
+			check_renumber(spin);
+			id = spin->si_newcompID--;
+		    } while (vim_strchr((char_u *)"/?*+[]\\-^", id) != NULL);
+		    ci->ci_newID = id;
+		    hash_add(&aff->af_comp, ci->ci_key);
+		}
+		*tp++ = id;
+	    }
+	    if (aff->af_flagtype == AFT_NUM && *p == ',')
+		++p;
+	}
+    }
+
+    *tp = NUL;
+}
+
+/*
+ * Check that the new IDs for postponed affixes and compounding don't overrun
+ * each other.  We have almost 255 available, but start at 0-127 to avoid
+ * using two bytes for utf-8.  When the 0-127 range is used up go to 128-255.
+ * When that is used up an error message is given.
+ */
+    static void
+check_renumber(spellinfo_T *spin)
+{
+    if (spin->si_newprefID == spin->si_newcompID && spin->si_newcompID < 128)
+    {
+	spin->si_newprefID = 127;
+	spin->si_newcompID = 255;
+    }
+}
+
+/*
+ * Return TRUE if flag "flag" appears in affix list "afflist".
+ */
+    static int
+flag_in_afflist(int flagtype, char_u *afflist, unsigned flag)
+{
+    char_u	*p;
+    unsigned	n;
+
+    switch (flagtype)
+    {
+	case AFT_CHAR:
+	    return vim_strchr(afflist, flag) != NULL;
+
+	case AFT_CAPLONG:
+	case AFT_LONG:
+	    for (p = afflist; *p != NUL; )
+	    {
+#ifdef FEAT_MBYTE
+		n = mb_ptr2char_adv(&p);
+#else
+		n = *p++;
+#endif
+		if ((flagtype == AFT_LONG || (n >= 'A' && n <= 'Z'))
+								 && *p != NUL)
+#ifdef FEAT_MBYTE
+		    n = mb_ptr2char_adv(&p) + (n << 16);
+#else
+		    n = *p++ + (n << 16);
+#endif
+		if (n == flag)
+		    return TRUE;
+	    }
+	    break;
+
+	case AFT_NUM:
+	    for (p = afflist; *p != NUL; )
+	    {
+		n = getdigits(&p);
+		if (n == flag)
+		    return TRUE;
+		if (*p != NUL)	/* skip over comma */
+		    ++p;
+	    }
+	    break;
+    }
+    return FALSE;
+}
+
+/*
+ * Give a warning when "spinval" and "affval" numbers are set and not the same.
+ */
+    static void
+aff_check_number(int spinval, int affval, char *name)
+{
+    if (spinval != 0 && spinval != affval)
+	smsg((char_u *)_("%s value differs from what is used in another .aff file"), name);
+}
+
+/*
+ * Give a warning when "spinval" and "affval" strings are set and not the same.
+ */
+    static void
+aff_check_string(char_u *spinval, char_u *affval, char *name)
+{
+    if (spinval != NULL && STRCMP(spinval, affval) != 0)
+	smsg((char_u *)_("%s value differs from what is used in another .aff file"), name);
+}
+
+/*
+ * Return TRUE if strings "s1" and "s2" are equal.  Also consider both being
+ * NULL as equal.
+ */
+    static int
+str_equal(char_u *s1, char_u *s2)
+{
+    if (s1 == NULL || s2 == NULL)
+	return s1 == s2;
+    return STRCMP(s1, s2) == 0;
+}
+
+/*
+ * Add a from-to item to "gap".  Used for REP and SAL items.
+ * They are stored case-folded.
+ */
+    static void
+add_fromto(
+    spellinfo_T	*spin,
+    garray_T	*gap,
+    char_u	*from,
+    char_u	*to)
+{
+    fromto_T	*ftp;
+    char_u	word[MAXWLEN];
+
+    if (ga_grow(gap, 1) == OK)
+    {
+	ftp = ((fromto_T *)gap->ga_data) + gap->ga_len;
+	(void)spell_casefold(from, (int)STRLEN(from), word, MAXWLEN);
+	ftp->ft_from = getroom_save(spin, word);
+	(void)spell_casefold(to, (int)STRLEN(to), word, MAXWLEN);
+	ftp->ft_to = getroom_save(spin, word);
+	++gap->ga_len;
+    }
+}
+
+/*
+ * Convert a boolean argument in a SAL line to TRUE or FALSE;
+ */
+    static int
+sal_to_bool(char_u *s)
+{
+    return STRCMP(s, "1") == 0 || STRCMP(s, "true") == 0;
+}
+
+/*
+ * Free the structure filled by spell_read_aff().
+ */
+    static void
+spell_free_aff(afffile_T *aff)
+{
+    hashtab_T	*ht;
+    hashitem_T	*hi;
+    int		todo;
+    affheader_T	*ah;
+    affentry_T	*ae;
+
+    vim_free(aff->af_enc);
+
+    /* All this trouble to free the "ae_prog" items... */
+    for (ht = &aff->af_pref; ; ht = &aff->af_suff)
+    {
+	todo = (int)ht->ht_used;
+	for (hi = ht->ht_array; todo > 0; ++hi)
+	{
+	    if (!HASHITEM_EMPTY(hi))
+	    {
+		--todo;
+		ah = HI2AH(hi);
+		for (ae = ah->ah_first; ae != NULL; ae = ae->ae_next)
+		    vim_regfree(ae->ae_prog);
+	    }
+	}
+	if (ht == &aff->af_suff)
+	    break;
+    }
+
+    hash_clear(&aff->af_pref);
+    hash_clear(&aff->af_suff);
+    hash_clear(&aff->af_comp);
+}
+
+/*
+ * Read dictionary file "fname".
+ * Returns OK or FAIL;
+ */
+    static int
+spell_read_dic(spellinfo_T *spin, char_u *fname, afffile_T *affile)
+{
+    hashtab_T	ht;
+    char_u	line[MAXLINELEN];
+    char_u	*p;
+    char_u	*afflist;
+    char_u	store_afflist[MAXWLEN];
+    int		pfxlen;
+    int		need_affix;
+    char_u	*dw;
+    char_u	*pc;
+    char_u	*w;
+    int		l;
+    hash_T	hash;
+    hashitem_T	*hi;
+    FILE	*fd;
+    int		lnum = 1;
+    int		non_ascii = 0;
+    int		retval = OK;
+    char_u	message[MAXLINELEN + MAXWLEN];
+    int		flags;
+    int		duplicate = 0;
+
+    /*
+     * Open the file.
+     */
+    fd = mch_fopen((char *)fname, "r");
+    if (fd == NULL)
+    {
+	EMSG2(_(e_notopen), fname);
+	return FAIL;
+    }
+
+    /* The hashtable is only used to detect duplicated words. */
+    hash_init(&ht);
+
+    vim_snprintf((char *)IObuff, IOSIZE,
+				  _("Reading dictionary file %s ..."), fname);
+    spell_message(spin, IObuff);
+
+    /* start with a message for the first line */
+    spin->si_msg_count = 999999;
+
+    /* Read and ignore the first line: word count. */
+    (void)vim_fgets(line, MAXLINELEN, fd);
+    if (!vim_isdigit(*skipwhite(line)))
+	EMSG2(_("E760: No word count in %s"), fname);
+
+    /*
+     * Read all the lines in the file one by one.
+     * The words are converted to 'encoding' here, before being added to
+     * the hashtable.
+     */
+    while (!vim_fgets(line, MAXLINELEN, fd) && !got_int)
+    {
+	line_breakcheck();
+	++lnum;
+	if (line[0] == '#' || line[0] == '/')
+	    continue;	/* comment line */
+
+	/* Remove CR, LF and white space from the end.  White space halfway
+	 * the word is kept to allow e.g., "et al.". */
+	l = (int)STRLEN(line);
+	while (l > 0 && line[l - 1] <= ' ')
+	    --l;
+	if (l == 0)
+	    continue;	/* empty line */
+	line[l] = NUL;
+
+#ifdef FEAT_MBYTE
+	/* Convert from "SET" to 'encoding' when needed. */
+	if (spin->si_conv.vc_type != CONV_NONE)
+	{
+	    pc = string_convert(&spin->si_conv, line, NULL);
+	    if (pc == NULL)
+	    {
+		smsg((char_u *)_("Conversion failure for word in %s line %d: %s"),
+						       fname, lnum, line);
+		continue;
+	    }
+	    w = pc;
+	}
+	else
+#endif
+	{
+	    pc = NULL;
+	    w = line;
+	}
+
+	/* Truncate the word at the "/", set "afflist" to what follows.
+	 * Replace "\/" by "/" and "\\" by "\". */
+	afflist = NULL;
+	for (p = w; *p != NUL; mb_ptr_adv(p))
+	{
+	    if (*p == '\\' && (p[1] == '\\' || p[1] == '/'))
+		STRMOVE(p, p + 1);
+	    else if (*p == '/')
+	    {
+		*p = NUL;
+		afflist = p + 1;
+		break;
+	    }
+	}
+
+	/* Skip non-ASCII words when "spin->si_ascii" is TRUE. */
+	if (spin->si_ascii && has_non_ascii(w))
+	{
+	    ++non_ascii;
+	    vim_free(pc);
+	    continue;
+	}
+
+	/* This takes time, print a message every 10000 words. */
+	if (spin->si_verbose && spin->si_msg_count > 10000)
+	{
+	    spin->si_msg_count = 0;
+	    vim_snprintf((char *)message, sizeof(message),
+		    _("line %6d, word %6d - %s"),
+		       lnum, spin->si_foldwcount + spin->si_keepwcount, w);
+	    msg_start();
+	    msg_puts_long_attr(message, 0);
+	    msg_clr_eos();
+	    msg_didout = FALSE;
+	    msg_col = 0;
+	    out_flush();
+	}
+
+	/* Store the word in the hashtable to be able to find duplicates. */
+	dw = (char_u *)getroom_save(spin, w);
+	if (dw == NULL)
+	{
+	    retval = FAIL;
+	    vim_free(pc);
+	    break;
+	}
+
+	hash = hash_hash(dw);
+	hi = hash_lookup(&ht, dw, hash);
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    if (p_verbose > 0)
+		smsg((char_u *)_("Duplicate word in %s line %d: %s"),
+							     fname, lnum, dw);
+	    else if (duplicate == 0)
+		smsg((char_u *)_("First duplicate word in %s line %d: %s"),
+							     fname, lnum, dw);
+	    ++duplicate;
+	}
+	else
+	    hash_add_item(&ht, hi, dw, hash);
+
+	flags = 0;
+	store_afflist[0] = NUL;
+	pfxlen = 0;
+	need_affix = FALSE;
+	if (afflist != NULL)
+	{
+	    /* Extract flags from the affix list. */
+	    flags |= get_affix_flags(affile, afflist);
+
+	    if (affile->af_needaffix != 0 && flag_in_afflist(
+			  affile->af_flagtype, afflist, affile->af_needaffix))
+		need_affix = TRUE;
+
+	    if (affile->af_pfxpostpone)
+		/* Need to store the list of prefix IDs with the word. */
+		pfxlen = get_pfxlist(affile, afflist, store_afflist);
+
+	    if (spin->si_compflags != NULL)
+		/* Need to store the list of compound flags with the word.
+		 * Concatenate them to the list of prefix IDs. */
+		get_compflags(affile, afflist, store_afflist + pfxlen);
+	}
+
+	/* Add the word to the word tree(s). */
+	if (store_word(spin, dw, flags, spin->si_region,
+					   store_afflist, need_affix) == FAIL)
+	    retval = FAIL;
+
+	if (afflist != NULL)
+	{
+	    /* Find all matching suffixes and add the resulting words.
+	     * Additionally do matching prefixes that combine. */
+	    if (store_aff_word(spin, dw, afflist, affile,
+			   &affile->af_suff, &affile->af_pref,
+			    CONDIT_SUF, flags, store_afflist, pfxlen) == FAIL)
+		retval = FAIL;
+
+	    /* Find all matching prefixes and add the resulting words. */
+	    if (store_aff_word(spin, dw, afflist, affile,
+			  &affile->af_pref, NULL,
+			    CONDIT_SUF, flags, store_afflist, pfxlen) == FAIL)
+		retval = FAIL;
+	}
+
+	vim_free(pc);
+    }
+
+    if (duplicate > 0)
+	smsg((char_u *)_("%d duplicate word(s) in %s"), duplicate, fname);
+    if (spin->si_ascii && non_ascii > 0)
+	smsg((char_u *)_("Ignored %d word(s) with non-ASCII characters in %s"),
+							    non_ascii, fname);
+    hash_clear(&ht);
+
+    fclose(fd);
+    return retval;
+}
+
+/*
+ * Check for affix flags in "afflist" that are turned into word flags.
+ * Return WF_ flags.
+ */
+    static int
+get_affix_flags(afffile_T *affile, char_u *afflist)
+{
+    int		flags = 0;
+
+    if (affile->af_keepcase != 0 && flag_in_afflist(
+			   affile->af_flagtype, afflist, affile->af_keepcase))
+	flags |= WF_KEEPCAP | WF_FIXCAP;
+    if (affile->af_rare != 0 && flag_in_afflist(
+			       affile->af_flagtype, afflist, affile->af_rare))
+	flags |= WF_RARE;
+    if (affile->af_bad != 0 && flag_in_afflist(
+				affile->af_flagtype, afflist, affile->af_bad))
+	flags |= WF_BANNED;
+    if (affile->af_needcomp != 0 && flag_in_afflist(
+			   affile->af_flagtype, afflist, affile->af_needcomp))
+	flags |= WF_NEEDCOMP;
+    if (affile->af_comproot != 0 && flag_in_afflist(
+			   affile->af_flagtype, afflist, affile->af_comproot))
+	flags |= WF_COMPROOT;
+    if (affile->af_nosuggest != 0 && flag_in_afflist(
+			  affile->af_flagtype, afflist, affile->af_nosuggest))
+	flags |= WF_NOSUGGEST;
+    return flags;
+}
+
+/*
+ * Get the list of prefix IDs from the affix list "afflist".
+ * Used for PFXPOSTPONE.
+ * Put the resulting flags in "store_afflist[MAXWLEN]" with a terminating NUL
+ * and return the number of affixes.
+ */
+    static int
+get_pfxlist(
+    afffile_T	*affile,
+    char_u	*afflist,
+    char_u	*store_afflist)
+{
+    char_u	*p;
+    char_u	*prevp;
+    int		cnt = 0;
+    int		id;
+    char_u	key[AH_KEY_LEN];
+    hashitem_T	*hi;
+
+    for (p = afflist; *p != NUL; )
+    {
+	prevp = p;
+	if (get_affitem(affile->af_flagtype, &p) != 0)
+	{
+	    /* A flag is a postponed prefix flag if it appears in "af_pref"
+	     * and it's ID is not zero. */
+	    vim_strncpy(key, prevp, p - prevp);
+	    hi = hash_find(&affile->af_pref, key);
+	    if (!HASHITEM_EMPTY(hi))
+	    {
+		id = HI2AH(hi)->ah_newID;
+		if (id != 0)
+		    store_afflist[cnt++] = id;
+	    }
+	}
+	if (affile->af_flagtype == AFT_NUM && *p == ',')
+	    ++p;
+    }
+
+    store_afflist[cnt] = NUL;
+    return cnt;
+}
+
+/*
+ * Get the list of compound IDs from the affix list "afflist" that are used
+ * for compound words.
+ * Puts the flags in "store_afflist[]".
+ */
+    static void
+get_compflags(
+    afffile_T	*affile,
+    char_u	*afflist,
+    char_u	*store_afflist)
+{
+    char_u	*p;
+    char_u	*prevp;
+    int		cnt = 0;
+    char_u	key[AH_KEY_LEN];
+    hashitem_T	*hi;
+
+    for (p = afflist; *p != NUL; )
+    {
+	prevp = p;
+	if (get_affitem(affile->af_flagtype, &p) != 0)
+	{
+	    /* A flag is a compound flag if it appears in "af_comp". */
+	    vim_strncpy(key, prevp, p - prevp);
+	    hi = hash_find(&affile->af_comp, key);
+	    if (!HASHITEM_EMPTY(hi))
+		store_afflist[cnt++] = HI2CI(hi)->ci_newID;
+	}
+	if (affile->af_flagtype == AFT_NUM && *p == ',')
+	    ++p;
+    }
+
+    store_afflist[cnt] = NUL;
+}
+
+/*
+ * Apply affixes to a word and store the resulting words.
+ * "ht" is the hashtable with affentry_T that need to be applied, either
+ * prefixes or suffixes.
+ * "xht", when not NULL, is the prefix hashtable, to be used additionally on
+ * the resulting words for combining affixes.
+ *
+ * Returns FAIL when out of memory.
+ */
+    static int
+store_aff_word(
+    spellinfo_T	*spin,		/* spell info */
+    char_u	*word,		/* basic word start */
+    char_u	*afflist,	/* list of names of supported affixes */
+    afffile_T	*affile,
+    hashtab_T	*ht,
+    hashtab_T	*xht,
+    int		condit,		/* CONDIT_SUF et al. */
+    int		flags,		/* flags for the word */
+    char_u	*pfxlist,	/* list of prefix IDs */
+    int		pfxlen)		/* nr of flags in "pfxlist" for prefixes, rest
+				 * is compound flags */
+{
+    int		todo;
+    hashitem_T	*hi;
+    affheader_T	*ah;
+    affentry_T	*ae;
+    char_u	newword[MAXWLEN];
+    int		retval = OK;
+    int		i, j;
+    char_u	*p;
+    int		use_flags;
+    char_u	*use_pfxlist;
+    int		use_pfxlen;
+    int		need_affix;
+    char_u	store_afflist[MAXWLEN];
+    char_u	pfx_pfxlist[MAXWLEN];
+    size_t	wordlen = STRLEN(word);
+    int		use_condit;
+
+    todo = (int)ht->ht_used;
+    for (hi = ht->ht_array; todo > 0 && retval == OK; ++hi)
+    {
+	if (!HASHITEM_EMPTY(hi))
+	{
+	    --todo;
+	    ah = HI2AH(hi);
+
+	    /* Check that the affix combines, if required, and that the word
+	     * supports this affix. */
+	    if (((condit & CONDIT_COMB) == 0 || ah->ah_combine)
+		    && flag_in_afflist(affile->af_flagtype, afflist,
+								 ah->ah_flag))
+	    {
+		/* Loop over all affix entries with this name. */
+		for (ae = ah->ah_first; ae != NULL; ae = ae->ae_next)
+		{
+		    /* Check the condition.  It's not logical to match case
+		     * here, but it is required for compatibility with
+		     * Myspell.
+		     * Another requirement from Myspell is that the chop
+		     * string is shorter than the word itself.
+		     * For prefixes, when "PFXPOSTPONE" was used, only do
+		     * prefixes with a chop string and/or flags.
+		     * When a previously added affix had CIRCUMFIX this one
+		     * must have it too, if it had not then this one must not
+		     * have one either. */
+		    if ((xht != NULL || !affile->af_pfxpostpone
+				|| ae->ae_chop != NULL
+				|| ae->ae_flags != NULL)
+			    && (ae->ae_chop == NULL
+				|| STRLEN(ae->ae_chop) < wordlen)
+			    && (ae->ae_prog == NULL
+				|| vim_regexec_prog(&ae->ae_prog, FALSE,
+							    word, (colnr_T)0))
+			    && (((condit & CONDIT_CFIX) == 0)
+				== ((condit & CONDIT_AFF) == 0
+				    || ae->ae_flags == NULL
+				    || !flag_in_afflist(affile->af_flagtype,
+					ae->ae_flags, affile->af_circumfix))))
+		    {
+			/* Match.  Remove the chop and add the affix. */
+			if (xht == NULL)
+			{
+			    /* prefix: chop/add at the start of the word */
+			    if (ae->ae_add == NULL)
+				*newword = NUL;
+			    else
+				vim_strncpy(newword, ae->ae_add, MAXWLEN - 1);
+			    p = word;
+			    if (ae->ae_chop != NULL)
+			    {
+				/* Skip chop string. */
+#ifdef FEAT_MBYTE
+				if (has_mbyte)
+				{
+				    i = mb_charlen(ae->ae_chop);
+				    for ( ; i > 0; --i)
+					mb_ptr_adv(p);
+				}
+				else
+#endif
+				    p += STRLEN(ae->ae_chop);
+			    }
+			    STRCAT(newword, p);
+			}
+			else
+			{
+			    /* suffix: chop/add at the end of the word */
+			    vim_strncpy(newword, word, MAXWLEN - 1);
+			    if (ae->ae_chop != NULL)
+			    {
+				/* Remove chop string. */
+				p = newword + STRLEN(newword);
+				i = (int)MB_CHARLEN(ae->ae_chop);
+				for ( ; i > 0; --i)
+				    mb_ptr_back(newword, p);
+				*p = NUL;
+			    }
+			    if (ae->ae_add != NULL)
+				STRCAT(newword, ae->ae_add);
+			}
+
+			use_flags = flags;
+			use_pfxlist = pfxlist;
+			use_pfxlen = pfxlen;
+			need_affix = FALSE;
+			use_condit = condit | CONDIT_COMB | CONDIT_AFF;
+			if (ae->ae_flags != NULL)
+			{
+			    /* Extract flags from the affix list. */
+			    use_flags |= get_affix_flags(affile, ae->ae_flags);
+
+			    if (affile->af_needaffix != 0 && flag_in_afflist(
+					affile->af_flagtype, ae->ae_flags,
+							affile->af_needaffix))
+				need_affix = TRUE;
+
+			    /* When there is a CIRCUMFIX flag the other affix
+			     * must also have it and we don't add the word
+			     * with one affix. */
+			    if (affile->af_circumfix != 0 && flag_in_afflist(
+					affile->af_flagtype, ae->ae_flags,
+							affile->af_circumfix))
+			    {
+				use_condit |= CONDIT_CFIX;
+				if ((condit & CONDIT_CFIX) == 0)
+				    need_affix = TRUE;
+			    }
+
+			    if (affile->af_pfxpostpone
+						|| spin->si_compflags != NULL)
+			    {
+				if (affile->af_pfxpostpone)
+				    /* Get prefix IDS from the affix list. */
+				    use_pfxlen = get_pfxlist(affile,
+						 ae->ae_flags, store_afflist);
+				else
+				    use_pfxlen = 0;
+				use_pfxlist = store_afflist;
+
+				/* Combine the prefix IDs. Avoid adding the
+				 * same ID twice. */
+				for (i = 0; i < pfxlen; ++i)
+				{
+				    for (j = 0; j < use_pfxlen; ++j)
+					if (pfxlist[i] == use_pfxlist[j])
+					    break;
+				    if (j == use_pfxlen)
+					use_pfxlist[use_pfxlen++] = pfxlist[i];
+				}
+
+				if (spin->si_compflags != NULL)
+				    /* Get compound IDS from the affix list. */
+				    get_compflags(affile, ae->ae_flags,
+						  use_pfxlist + use_pfxlen);
+
+				/* Combine the list of compound flags.
+				 * Concatenate them to the prefix IDs list.
+				 * Avoid adding the same ID twice. */
+				for (i = pfxlen; pfxlist[i] != NUL; ++i)
+				{
+				    for (j = use_pfxlen;
+						   use_pfxlist[j] != NUL; ++j)
+					if (pfxlist[i] == use_pfxlist[j])
+					    break;
+				    if (use_pfxlist[j] == NUL)
+				    {
+					use_pfxlist[j++] = pfxlist[i];
+					use_pfxlist[j] = NUL;
+				    }
+				}
+			    }
+			}
+
+			/* Obey a "COMPOUNDFORBIDFLAG" of the affix: don't
+			 * use the compound flags. */
+			if (use_pfxlist != NULL && ae->ae_compforbid)
+			{
+			    vim_strncpy(pfx_pfxlist, use_pfxlist, use_pfxlen);
+			    use_pfxlist = pfx_pfxlist;
+			}
+
+			/* When there are postponed prefixes... */
+			if (spin->si_prefroot != NULL
+				&& spin->si_prefroot->wn_sibling != NULL)
+			{
+			    /* ... add a flag to indicate an affix was used. */
+			    use_flags |= WF_HAS_AFF;
+
+			    /* ... don't use a prefix list if combining
+			     * affixes is not allowed.  But do use the
+			     * compound flags after them. */
+			    if (!ah->ah_combine && use_pfxlist != NULL)
+				use_pfxlist += use_pfxlen;
+			}
+
+			/* When compounding is supported and there is no
+			 * "COMPOUNDPERMITFLAG" then forbid compounding on the
+			 * side where the affix is applied. */
+			if (spin->si_compflags != NULL && !ae->ae_comppermit)
+			{
+			    if (xht != NULL)
+				use_flags |= WF_NOCOMPAFT;
+			    else
+				use_flags |= WF_NOCOMPBEF;
+			}
+
+			/* Store the modified word. */
+			if (store_word(spin, newword, use_flags,
+						 spin->si_region, use_pfxlist,
+							  need_affix) == FAIL)
+			    retval = FAIL;
+
+			/* When added a prefix or a first suffix and the affix
+			 * has flags may add a(nother) suffix.  RECURSIVE! */
+			if ((condit & CONDIT_SUF) && ae->ae_flags != NULL)
+			    if (store_aff_word(spin, newword, ae->ae_flags,
+					affile, &affile->af_suff, xht,
+					   use_condit & (xht == NULL
+							? ~0 :  ~CONDIT_SUF),
+				      use_flags, use_pfxlist, pfxlen) == FAIL)
+				retval = FAIL;
+
+			/* When added a suffix and combining is allowed also
+			 * try adding a prefix additionally.  Both for the
+			 * word flags and for the affix flags.  RECURSIVE! */
+			if (xht != NULL && ah->ah_combine)
+			{
+			    if (store_aff_word(spin, newword,
+					afflist, affile,
+					xht, NULL, use_condit,
+					use_flags, use_pfxlist,
+					pfxlen) == FAIL
+				    || (ae->ae_flags != NULL
+					&& store_aff_word(spin, newword,
+					    ae->ae_flags, affile,
+					    xht, NULL, use_condit,
+					    use_flags, use_pfxlist,
+					    pfxlen) == FAIL))
+				retval = FAIL;
+			}
+		    }
+		}
+	    }
+	}
+    }
+
+    return retval;
+}
+
+/*
+ * Read a file with a list of words.
+ */
+    static int
+spell_read_wordfile(spellinfo_T *spin, char_u *fname)
+{
+    FILE	*fd;
+    long	lnum = 0;
+    char_u	rline[MAXLINELEN];
+    char_u	*line;
+    char_u	*pc = NULL;
+    char_u	*p;
+    int		l;
+    int		retval = OK;
+    int		did_word = FALSE;
+    int		non_ascii = 0;
+    int		flags;
+    int		regionmask;
+
+    /*
+     * Open the file.
+     */
+    fd = mch_fopen((char *)fname, "r");
+    if (fd == NULL)
+    {
+	EMSG2(_(e_notopen), fname);
+	return FAIL;
+    }
+
+    vim_snprintf((char *)IObuff, IOSIZE, _("Reading word file %s ..."), fname);
+    spell_message(spin, IObuff);
+
+    /*
+     * Read all the lines in the file one by one.
+     */
+    while (!vim_fgets(rline, MAXLINELEN, fd) && !got_int)
+    {
+	line_breakcheck();
+	++lnum;
+
+	/* Skip comment lines. */
+	if (*rline == '#')
+	    continue;
+
+	/* Remove CR, LF and white space from the end. */
+	l = (int)STRLEN(rline);
+	while (l > 0 && rline[l - 1] <= ' ')
+	    --l;
+	if (l == 0)
+	    continue;	/* empty or blank line */
+	rline[l] = NUL;
+
+	/* Convert from "/encoding={encoding}" to 'encoding' when needed. */
+	vim_free(pc);
+#ifdef FEAT_MBYTE
+	if (spin->si_conv.vc_type != CONV_NONE)
+	{
+	    pc = string_convert(&spin->si_conv, rline, NULL);
+	    if (pc == NULL)
+	    {
+		smsg((char_u *)_("Conversion failure for word in %s line %d: %s"),
+							   fname, lnum, rline);
+		continue;
+	    }
+	    line = pc;
+	}
+	else
+#endif
+	{
+	    pc = NULL;
+	    line = rline;
+	}
+
+	if (*line == '/')
+	{
+	    ++line;
+	    if (STRNCMP(line, "encoding=", 9) == 0)
+	    {
+		if (spin->si_conv.vc_type != CONV_NONE)
+		    smsg((char_u *)_("Duplicate /encoding= line ignored in %s line %d: %s"),
+						       fname, lnum, line - 1);
+		else if (did_word)
+		    smsg((char_u *)_("/encoding= line after word ignored in %s line %d: %s"),
+						       fname, lnum, line - 1);
+		else
+		{
+#ifdef FEAT_MBYTE
+		    char_u	*enc;
+
+		    /* Setup for conversion to 'encoding'. */
+		    line += 9;
+		    enc = enc_canonize(line);
+		    if (enc != NULL && !spin->si_ascii
+			    && convert_setup(&spin->si_conv, enc,
+							       p_enc) == FAIL)
+			smsg((char_u *)_("Conversion in %s not supported: from %s to %s"),
+							  fname, line, p_enc);
+		    vim_free(enc);
+		    spin->si_conv.vc_fail = TRUE;
+#else
+		    smsg((char_u *)_("Conversion in %s not supported"), fname);
+#endif
+		}
+		continue;
+	    }
+
+	    if (STRNCMP(line, "regions=", 8) == 0)
+	    {
+		if (spin->si_region_count > 1)
+		    smsg((char_u *)_("Duplicate /regions= line ignored in %s line %d: %s"),
+						       fname, lnum, line);
+		else
+		{
+		    line += 8;
+		    if (STRLEN(line) > 16)
+			smsg((char_u *)_("Too many regions in %s line %d: %s"),
+						       fname, lnum, line);
+		    else
+		    {
+			spin->si_region_count = (int)STRLEN(line) / 2;
+			STRCPY(spin->si_region_name, line);
+
+			/* Adjust the mask for a word valid in all regions. */
+			spin->si_region = (1 << spin->si_region_count) - 1;
+		    }
+		}
+		continue;
+	    }
+
+	    smsg((char_u *)_("/ line ignored in %s line %d: %s"),
+						       fname, lnum, line - 1);
+	    continue;
+	}
+
+	flags = 0;
+	regionmask = spin->si_region;
+
+	/* Check for flags and region after a slash. */
+	p = vim_strchr(line, '/');
+	if (p != NULL)
+	{
+	    *p++ = NUL;
+	    while (*p != NUL)
+	    {
+		if (*p == '=')		/* keep-case word */
+		    flags |= WF_KEEPCAP | WF_FIXCAP;
+		else if (*p == '!')	/* Bad, bad, wicked word. */
+		    flags |= WF_BANNED;
+		else if (*p == '?')	/* Rare word. */
+		    flags |= WF_RARE;
+		else if (VIM_ISDIGIT(*p)) /* region number(s) */
+		{
+		    if ((flags & WF_REGION) == 0)   /* first one */
+			regionmask = 0;
+		    flags |= WF_REGION;
+
+		    l = *p - '0';
+		    if (l > spin->si_region_count)
+		    {
+			smsg((char_u *)_("Invalid region nr in %s line %d: %s"),
+							  fname, lnum, p);
+			break;
+		    }
+		    regionmask |= 1 << (l - 1);
+		}
+		else
+		{
+		    smsg((char_u *)_("Unrecognized flags in %s line %d: %s"),
+							      fname, lnum, p);
+		    break;
+		}
+		++p;
+	    }
+	}
+
+	/* Skip non-ASCII words when "spin->si_ascii" is TRUE. */
+	if (spin->si_ascii && has_non_ascii(line))
+	{
+	    ++non_ascii;
+	    continue;
+	}
+
+	/* Normal word: store it. */
+	if (store_word(spin, line, flags, regionmask, NULL, FALSE) == FAIL)
+	{
+	    retval = FAIL;
+	    break;
+	}
+	did_word = TRUE;
+    }
+
+    vim_free(pc);
+    fclose(fd);
+
+    if (spin->si_ascii && non_ascii > 0)
+    {
+	vim_snprintf((char *)IObuff, IOSIZE,
+		  _("Ignored %d words with non-ASCII characters"), non_ascii);
+	spell_message(spin, IObuff);
+    }
+
+    return retval;
+}
+
+/*
+ * Get part of an sblock_T, "len" bytes long.
+ * This avoids calling free() for every little struct we use (and keeping
+ * track of them).
+ * The memory is cleared to all zeros.
+ * Returns NULL when out of memory.
+ */
+    static void *
+getroom(
+    spellinfo_T *spin,
+    size_t	len,		/* length needed */
+    int		align)		/* align for pointer */
+{
+    char_u	*p;
+    sblock_T	*bl = spin->si_blocks;
+
+    if (align && bl != NULL)
+	/* Round size up for alignment.  On some systems structures need to be
+	 * aligned to the size of a pointer (e.g., SPARC). */
+	bl->sb_used = (bl->sb_used + sizeof(char *) - 1)
+						      & ~(sizeof(char *) - 1);
+
+    if (bl == NULL || bl->sb_used + len > SBLOCKSIZE)
+    {
+	if (len >= SBLOCKSIZE)
+	    bl = NULL;
+	else
+	    /* Allocate a block of memory. It is not freed until much later. */
+	    bl = (sblock_T *)alloc_clear(
+				   (unsigned)(sizeof(sblock_T) + SBLOCKSIZE));
+	if (bl == NULL)
+	{
+	    if (!spin->si_did_emsg)
+	    {
+		EMSG(_("E845: Insufficient memory, word list will be incomplete"));
+		spin->si_did_emsg = TRUE;
+	    }
+	    return NULL;
+	}
+	bl->sb_next = spin->si_blocks;
+	spin->si_blocks = bl;
+	bl->sb_used = 0;
+	++spin->si_blocks_cnt;
+    }
+
+    p = bl->sb_data + bl->sb_used;
+    bl->sb_used += (int)len;
+
+    return p;
+}
+
+/*
+ * Make a copy of a string into memory allocated with getroom().
+ * Returns NULL when out of memory.
+ */
+    static char_u *
+getroom_save(spellinfo_T *spin, char_u *s)
+{
+    char_u	*sc;
+
+    sc = (char_u *)getroom(spin, STRLEN(s) + 1, FALSE);
+    if (sc != NULL)
+	STRCPY(sc, s);
+    return sc;
+}
+
+
+/*
+ * Free the list of allocated sblock_T.
+ */
+    static void
+free_blocks(sblock_T *bl)
+{
+    sblock_T	*next;
+
+    while (bl != NULL)
+    {
+	next = bl->sb_next;
+	vim_free(bl);
+	bl = next;
+    }
+}
+
+/*
+ * Allocate the root of a word tree.
+ * Returns NULL when out of memory.
+ */
+    static wordnode_T *
+wordtree_alloc(spellinfo_T *spin)
+{
+    return (wordnode_T *)getroom(spin, sizeof(wordnode_T), TRUE);
+}
+
+/*
+ * Store a word in the tree(s).
+ * Always store it in the case-folded tree.  For a keep-case word this is
+ * useful when the word can also be used with all caps (no WF_FIXCAP flag) and
+ * used to find suggestions.
+ * For a keep-case word also store it in the keep-case tree.
+ * When "pfxlist" is not NULL store the word for each postponed prefix ID and
+ * compound flag.
+ */
+    static int
+store_word(
+    spellinfo_T	*spin,
+    char_u	*word,
+    int		flags,		/* extra flags, WF_BANNED */
+    int		region,		/* supported region(s) */
+    char_u	*pfxlist,	/* list of prefix IDs or NULL */
+    int		need_affix)	/* only store word with affix ID */
+{
+    int		len = (int)STRLEN(word);
+    int		ct = captype(word, word + len);
+    char_u	foldword[MAXWLEN];
+    int		res = OK;
+    char_u	*p;
+
+    (void)spell_casefold(word, len, foldword, MAXWLEN);
+    for (p = pfxlist; res == OK; ++p)
+    {
+	if (!need_affix || (p != NULL && *p != NUL))
+	    res = tree_add_word(spin, foldword, spin->si_foldroot, ct | flags,
+						  region, p == NULL ? 0 : *p);
+	if (p == NULL || *p == NUL)
+	    break;
+    }
+    ++spin->si_foldwcount;
+
+    if (res == OK && (ct == WF_KEEPCAP || (flags & WF_KEEPCAP)))
+    {
+	for (p = pfxlist; res == OK; ++p)
+	{
+	    if (!need_affix || (p != NULL && *p != NUL))
+		res = tree_add_word(spin, word, spin->si_keeproot, flags,
+						  region, p == NULL ? 0 : *p);
+	    if (p == NULL || *p == NUL)
+		break;
+	}
+	++spin->si_keepwcount;
+    }
+    return res;
+}
+
+/*
+ * Add word "word" to a word tree at "root".
+ * When "flags" < 0 we are adding to the prefix tree where "flags" is used for
+ * "rare" and "region" is the condition nr.
+ * Returns FAIL when out of memory.
+ */
+    static int
+tree_add_word(
+    spellinfo_T	*spin,
+    char_u	*word,
+    wordnode_T	*root,
+    int		flags,
+    int		region,
+    int		affixID)
+{
+    wordnode_T	*node = root;
+    wordnode_T	*np;
+    wordnode_T	*copyp, **copyprev;
+    wordnode_T	**prev = NULL;
+    int		i;
+
+    /* Add each byte of the word to the tree, including the NUL at the end. */
+    for (i = 0; ; ++i)
+    {
+	/* When there is more than one reference to this node we need to make
+	 * a copy, so that we can modify it.  Copy the whole list of siblings
+	 * (we don't optimize for a partly shared list of siblings). */
+	if (node != NULL && node->wn_refs > 1)
+	{
+	    --node->wn_refs;
+	    copyprev = prev;
+	    for (copyp = node; copyp != NULL; copyp = copyp->wn_sibling)
+	    {
+		/* Allocate a new node and copy the info. */
+		np = get_wordnode(spin);
+		if (np == NULL)
+		    return FAIL;
+		np->wn_child = copyp->wn_child;
+		if (np->wn_child != NULL)
+		    ++np->wn_child->wn_refs;	/* child gets extra ref */
+		np->wn_byte = copyp->wn_byte;
+		if (np->wn_byte == NUL)
+		{
+		    np->wn_flags = copyp->wn_flags;
+		    np->wn_region = copyp->wn_region;
+		    np->wn_affixID = copyp->wn_affixID;
+		}
+
+		/* Link the new node in the list, there will be one ref. */
+		np->wn_refs = 1;
+		if (copyprev != NULL)
+		    *copyprev = np;
+		copyprev = &np->wn_sibling;
+
+		/* Let "node" point to the head of the copied list. */
+		if (copyp == node)
+		    node = np;
+	    }
+	}
+
+	/* Look for the sibling that has the same character.  They are sorted
+	 * on byte value, thus stop searching when a sibling is found with a
+	 * higher byte value.  For zero bytes (end of word) the sorting is
+	 * done on flags and then on affixID. */
+	while (node != NULL
+		&& (node->wn_byte < word[i]
+		    || (node->wn_byte == NUL
+			&& (flags < 0
+			    ? node->wn_affixID < (unsigned)affixID
+			    : (node->wn_flags < (unsigned)(flags & WN_MASK)
+				|| (node->wn_flags == (flags & WN_MASK)
+				    && (spin->si_sugtree
+					? (node->wn_region & 0xffff) < region
+					: node->wn_affixID
+						    < (unsigned)affixID)))))))
+	{
+	    prev = &node->wn_sibling;
+	    node = *prev;
+	}
+	if (node == NULL
+		|| node->wn_byte != word[i]
+		|| (word[i] == NUL
+		    && (flags < 0
+			|| spin->si_sugtree
+			|| node->wn_flags != (flags & WN_MASK)
+			|| node->wn_affixID != affixID)))
+	{
+	    /* Allocate a new node. */
+	    np = get_wordnode(spin);
+	    if (np == NULL)
+		return FAIL;
+	    np->wn_byte = word[i];
+
+	    /* If "node" is NULL this is a new child or the end of the sibling
+	     * list: ref count is one.  Otherwise use ref count of sibling and
+	     * make ref count of sibling one (matters when inserting in front
+	     * of the list of siblings). */
+	    if (node == NULL)
+		np->wn_refs = 1;
+	    else
+	    {
+		np->wn_refs = node->wn_refs;
+		node->wn_refs = 1;
+	    }
+	    if (prev != NULL)
+		*prev = np;
+	    np->wn_sibling = node;
+	    node = np;
+	}
+
+	if (word[i] == NUL)
+	{
+	    node->wn_flags = flags;
+	    node->wn_region |= region;
+	    node->wn_affixID = affixID;
+	    break;
+	}
+	prev = &node->wn_child;
+	node = *prev;
+    }
+#ifdef SPELL_PRINTTREE
+    smsg((char_u *)"Added \"%s\"", word);
+    spell_print_tree(root->wn_sibling);
+#endif
+
+    /* count nr of words added since last message */
+    ++spin->si_msg_count;
+
+    if (spin->si_compress_cnt > 1)
+    {
+	if (--spin->si_compress_cnt == 1)
+	    /* Did enough words to lower the block count limit. */
+	    spin->si_blocks_cnt += compress_inc;
+    }
+
+    /*
+     * When we have allocated lots of memory we need to compress the word tree
+     * to free up some room.  But compression is slow, and we might actually
+     * need that room, thus only compress in the following situations:
+     * 1. When not compressed before (si_compress_cnt == 0): when using
+     *    "compress_start" blocks.
+     * 2. When compressed before and used "compress_inc" blocks before
+     *    adding "compress_added" words (si_compress_cnt > 1).
+     * 3. When compressed before, added "compress_added" words
+     *    (si_compress_cnt == 1) and the number of free nodes drops below the
+     *    maximum word length.
+     */
+#ifndef SPELL_COMPRESS_ALLWAYS
+    if (spin->si_compress_cnt == 1
+	    ? spin->si_free_count < MAXWLEN
+	    : spin->si_blocks_cnt >= compress_start)
+#endif
+    {
+	/* Decrement the block counter.  The effect is that we compress again
+	 * when the freed up room has been used and another "compress_inc"
+	 * blocks have been allocated.  Unless "compress_added" words have
+	 * been added, then the limit is put back again. */
+	spin->si_blocks_cnt -= compress_inc;
+	spin->si_compress_cnt = compress_added;
+
+	if (spin->si_verbose)
+	{
+	    msg_start();
+	    msg_puts((char_u *)_(msg_compressing));
+	    msg_clr_eos();
+	    msg_didout = FALSE;
+	    msg_col = 0;
+	    out_flush();
+	}
+
+	/* Compress both trees.  Either they both have many nodes, which makes
+	 * compression useful, or one of them is small, which means
+	 * compression goes fast.  But when filling the soundfold word tree
+	 * there is no keep-case tree. */
+	wordtree_compress(spin, spin->si_foldroot);
+	if (affixID >= 0)
+	    wordtree_compress(spin, spin->si_keeproot);
+    }
+
+    return OK;
+}
+
+/*
+ * Get a wordnode_T, either from the list of previously freed nodes or
+ * allocate a new one.
+ * Returns NULL when out of memory.
+ */
+    static wordnode_T *
+get_wordnode(spellinfo_T *spin)
+{
+    wordnode_T *n;
+
+    if (spin->si_first_free == NULL)
+	n = (wordnode_T *)getroom(spin, sizeof(wordnode_T), TRUE);
+    else
+    {
+	n = spin->si_first_free;
+	spin->si_first_free = n->wn_child;
+	vim_memset(n, 0, sizeof(wordnode_T));
+	--spin->si_free_count;
+    }
+#ifdef SPELL_PRINTTREE
+    if (n != NULL)
+	n->wn_nr = ++spin->si_wordnode_nr;
+#endif
+    return n;
+}
+
+/*
+ * Decrement the reference count on a node (which is the head of a list of
+ * siblings).  If the reference count becomes zero free the node and its
+ * siblings.
+ * Returns the number of nodes actually freed.
+ */
+    static int
+deref_wordnode(spellinfo_T *spin, wordnode_T *node)
+{
+    wordnode_T	*np;
+    int		cnt = 0;
+
+    if (--node->wn_refs == 0)
+    {
+	for (np = node; np != NULL; np = np->wn_sibling)
+	{
+	    if (np->wn_child != NULL)
+		cnt += deref_wordnode(spin, np->wn_child);
+	    free_wordnode(spin, np);
+	    ++cnt;
+	}
+	++cnt;	    /* length field */
+    }
+    return cnt;
+}
+
+/*
+ * Free a wordnode_T for re-use later.
+ * Only the "wn_child" field becomes invalid.
+ */
+    static void
+free_wordnode(spellinfo_T *spin, wordnode_T *n)
+{
+    n->wn_child = spin->si_first_free;
+    spin->si_first_free = n;
+    ++spin->si_free_count;
+}
+
+/*
+ * Compress a tree: find tails that are identical and can be shared.
+ */
+    static void
+wordtree_compress(spellinfo_T *spin, wordnode_T *root)
+{
+    hashtab_T	    ht;
+    int		    n;
+    int		    tot = 0;
+    int		    perc;
+
+    /* Skip the root itself, it's not actually used.  The first sibling is the
+     * start of the tree. */
+    if (root->wn_sibling != NULL)
+    {
+	hash_init(&ht);
+	n = node_compress(spin, root->wn_sibling, &ht, &tot);
+
+#ifndef SPELL_PRINTTREE
+	if (spin->si_verbose || p_verbose > 2)
+#endif
+	{
+	    if (tot > 1000000)
+		perc = (tot - n) / (tot / 100);
+	    else if (tot == 0)
+		perc = 0;
+	    else
+		perc = (tot - n) * 100 / tot;
+	    vim_snprintf((char *)IObuff, IOSIZE,
+			  _("Compressed %d of %d nodes; %d (%d%%) remaining"),
+						       n, tot, tot - n, perc);
+	    spell_message(spin, IObuff);
+	}
+#ifdef SPELL_PRINTTREE
+	spell_print_tree(root->wn_sibling);
+#endif
+	hash_clear(&ht);
+    }
+}
+
+/*
+ * Compress a node, its siblings and its children, depth first.
+ * Returns the number of compressed nodes.
+ */
+    static int
+node_compress(
+    spellinfo_T	*spin,
+    wordnode_T	*node,
+    hashtab_T	*ht,
+    int		*tot)	    /* total count of nodes before compressing,
+			       incremented while going through the tree */
+{
+    wordnode_T	*np;
+    wordnode_T	*tp;
+    wordnode_T	*child;
+    hash_T	hash;
+    hashitem_T	*hi;
+    int		len = 0;
+    unsigned	nr, n;
+    int		compressed = 0;
+
+    /*
+     * Go through the list of siblings.  Compress each child and then try
+     * finding an identical child to replace it.
+     * Note that with "child" we mean not just the node that is pointed to,
+     * but the whole list of siblings of which the child node is the first.
+     */
+    for (np = node; np != NULL && !got_int; np = np->wn_sibling)
+    {
+	++len;
+	if ((child = np->wn_child) != NULL)
+	{
+	    /* Compress the child first.  This fills hashkey. */
+	    compressed += node_compress(spin, child, ht, tot);
+
+	    /* Try to find an identical child. */
+	    hash = hash_hash(child->wn_u1.hashkey);
+	    hi = hash_lookup(ht, child->wn_u1.hashkey, hash);
+	    if (!HASHITEM_EMPTY(hi))
+	    {
+		/* There are children we encountered before with a hash value
+		 * identical to the current child.  Now check if there is one
+		 * that is really identical. */
+		for (tp = HI2WN(hi); tp != NULL; tp = tp->wn_u2.next)
+		    if (node_equal(child, tp))
+		    {
+			/* Found one!  Now use that child in place of the
+			 * current one.  This means the current child and all
+			 * its siblings is unlinked from the tree. */
+			++tp->wn_refs;
+			compressed += deref_wordnode(spin, child);
+			np->wn_child = tp;
+			break;
+		    }
+		if (tp == NULL)
+		{
+		    /* No other child with this hash value equals the child of
+		     * the node, add it to the linked list after the first
+		     * item. */
+		    tp = HI2WN(hi);
+		    child->wn_u2.next = tp->wn_u2.next;
+		    tp->wn_u2.next = child;
+		}
+	    }
+	    else
+		/* No other child has this hash value, add it to the
+		 * hashtable. */
+		hash_add_item(ht, hi, child->wn_u1.hashkey, hash);
+	}
+    }
+    *tot += len + 1;	/* add one for the node that stores the length */
+
+    /*
+     * Make a hash key for the node and its siblings, so that we can quickly
+     * find a lookalike node.  This must be done after compressing the sibling
+     * list, otherwise the hash key would become invalid by the compression.
+     */
+    node->wn_u1.hashkey[0] = len;
+    nr = 0;
+    for (np = node; np != NULL; np = np->wn_sibling)
+    {
+	if (np->wn_byte == NUL)
+	    /* end node: use wn_flags, wn_region and wn_affixID */
+	    n = np->wn_flags + (np->wn_region << 8) + (np->wn_affixID << 16);
+	else
+	    /* byte node: use the byte value and the child pointer */
+	    n = (unsigned)(np->wn_byte + ((long_u)np->wn_child << 8));
+	nr = nr * 101 + n;
+    }
+
+    /* Avoid NUL bytes, it terminates the hash key. */
+    n = nr & 0xff;
+    node->wn_u1.hashkey[1] = n == 0 ? 1 : n;
+    n = (nr >> 8) & 0xff;
+    node->wn_u1.hashkey[2] = n == 0 ? 1 : n;
+    n = (nr >> 16) & 0xff;
+    node->wn_u1.hashkey[3] = n == 0 ? 1 : n;
+    n = (nr >> 24) & 0xff;
+    node->wn_u1.hashkey[4] = n == 0 ? 1 : n;
+    node->wn_u1.hashkey[5] = NUL;
+
+    /* Check for CTRL-C pressed now and then. */
+    fast_breakcheck();
+
+    return compressed;
+}
+
+/*
+ * Return TRUE when two nodes have identical siblings and children.
+ */
+    static int
+node_equal(wordnode_T *n1, wordnode_T *n2)
+{
+    wordnode_T	*p1;
+    wordnode_T	*p2;
+
+    for (p1 = n1, p2 = n2; p1 != NULL && p2 != NULL;
+				     p1 = p1->wn_sibling, p2 = p2->wn_sibling)
+	if (p1->wn_byte != p2->wn_byte
+		|| (p1->wn_byte == NUL
+		    ? (p1->wn_flags != p2->wn_flags
+			|| p1->wn_region != p2->wn_region
+			|| p1->wn_affixID != p2->wn_affixID)
+		    : (p1->wn_child != p2->wn_child)))
+	    break;
+
+    return p1 == NULL && p2 == NULL;
+}
+
+static int
+#ifdef __BORLANDC__
+_RTLENTRYF
+#endif
+rep_compare(const void *s1, const void *s2);
+
+/*
+ * Function given to qsort() to sort the REP items on "from" string.
+ */
+    static int
+#ifdef __BORLANDC__
+_RTLENTRYF
+#endif
+rep_compare(const void *s1, const void *s2)
+{
+    fromto_T	*p1 = (fromto_T *)s1;
+    fromto_T	*p2 = (fromto_T *)s2;
+
+    return STRCMP(p1->ft_from, p2->ft_from);
+}
+
+/*
+ * Write the Vim .spl file "fname".
+ * Return FAIL or OK;
+ */
+    static int
+write_vim_spell(spellinfo_T *spin, char_u *fname)
+{
+    FILE	*fd;
+    int		regionmask;
+    int		round;
+    wordnode_T	*tree;
+    int		nodecount;
+    int		i;
+    int		l;
+    garray_T	*gap;
+    fromto_T	*ftp;
+    char_u	*p;
+    int		rr;
+    int		retval = OK;
+    size_t	fwv = 1;  /* collect return value of fwrite() to avoid
+			     warnings from picky compiler */
+
+    fd = mch_fopen((char *)fname, "w");
+    if (fd == NULL)
+    {
+	EMSG2(_(e_notopen), fname);
+	return FAIL;
+    }
+
+    /* <HEADER>: <fileID> <versionnr> */
+							    /* <fileID> */
+    fwv &= fwrite(VIMSPELLMAGIC, VIMSPELLMAGICL, (size_t)1, fd);
+    if (fwv != (size_t)1)
+	/* Catch first write error, don't try writing more. */
+	goto theend;
+
+    putc(VIMSPELLVERSION, fd);				    /* <versionnr> */
+
+    /*
+     * <SECTIONS>: <section> ... <sectionend>
+     */
+
+    /* SN_INFO: <infotext> */
+    if (spin->si_info != NULL)
+    {
+	putc(SN_INFO, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	i = (int)STRLEN(spin->si_info);
+	put_bytes(fd, (long_u)i, 4);			/* <sectionlen> */
+	fwv &= fwrite(spin->si_info, (size_t)i, (size_t)1, fd); /* <infotext> */
+    }
+
+    /* SN_REGION: <regionname> ...
+     * Write the region names only if there is more than one. */
+    if (spin->si_region_count > 1)
+    {
+	putc(SN_REGION, fd);				/* <sectionID> */
+	putc(SNF_REQUIRED, fd);				/* <sectionflags> */
+	l = spin->si_region_count * 2;
+	put_bytes(fd, (long_u)l, 4);			/* <sectionlen> */
+	fwv &= fwrite(spin->si_region_name, (size_t)l, (size_t)1, fd);
+							/* <regionname> ... */
+	regionmask = (1 << spin->si_region_count) - 1;
+    }
+    else
+	regionmask = 0;
+
+    /* SN_CHARFLAGS: <charflagslen> <charflags> <folcharslen> <folchars>
+     *
+     * The table with character flags and the table for case folding.
+     * This makes sure the same characters are recognized as word characters
+     * when generating an when using a spell file.
+     * Skip this for ASCII, the table may conflict with the one used for
+     * 'encoding'.
+     * Also skip this for an .add.spl file, the main spell file must contain
+     * the table (avoids that it conflicts).  File is shorter too.
+     */
+    if (!spin->si_ascii && !spin->si_add)
+    {
+	char_u	folchars[128 * 8];
+	int	flags;
+
+	putc(SN_CHARFLAGS, fd);				/* <sectionID> */
+	putc(SNF_REQUIRED, fd);				/* <sectionflags> */
+
+	/* Form the <folchars> string first, we need to know its length. */
+	l = 0;
+	for (i = 128; i < 256; ++i)
+	{
+#ifdef FEAT_MBYTE
+	    if (has_mbyte)
+		l += mb_char2bytes(spelltab.st_fold[i], folchars + l);
+	    else
+#endif
+		folchars[l++] = spelltab.st_fold[i];
+	}
+	put_bytes(fd, (long_u)(1 + 128 + 2 + l), 4);	/* <sectionlen> */
+
+	fputc(128, fd);					/* <charflagslen> */
+	for (i = 128; i < 256; ++i)
+	{
+	    flags = 0;
+	    if (spelltab.st_isw[i])
+		flags |= CF_WORD;
+	    if (spelltab.st_isu[i])
+		flags |= CF_UPPER;
+	    fputc(flags, fd);				/* <charflags> */
+	}
+
+	put_bytes(fd, (long_u)l, 2);			/* <folcharslen> */
+	fwv &= fwrite(folchars, (size_t)l, (size_t)1, fd); /* <folchars> */
+    }
+
+    /* SN_MIDWORD: <midword> */
+    if (spin->si_midword != NULL)
+    {
+	putc(SN_MIDWORD, fd);				/* <sectionID> */
+	putc(SNF_REQUIRED, fd);				/* <sectionflags> */
+
+	i = (int)STRLEN(spin->si_midword);
+	put_bytes(fd, (long_u)i, 4);			/* <sectionlen> */
+	fwv &= fwrite(spin->si_midword, (size_t)i, (size_t)1, fd);
+							/* <midword> */
+    }
+
+    /* SN_PREFCOND: <prefcondcnt> <prefcond> ... */
+    if (spin->si_prefcond.ga_len > 0)
+    {
+	putc(SN_PREFCOND, fd);				/* <sectionID> */
+	putc(SNF_REQUIRED, fd);				/* <sectionflags> */
+
+	l = write_spell_prefcond(NULL, &spin->si_prefcond);
+	put_bytes(fd, (long_u)l, 4);			/* <sectionlen> */
+
+	write_spell_prefcond(fd, &spin->si_prefcond);
+    }
+
+    /* SN_REP: <repcount> <rep> ...
+     * SN_SAL: <salflags> <salcount> <sal> ...
+     * SN_REPSAL: <repcount> <rep> ... */
+
+    /* round 1: SN_REP section
+     * round 2: SN_SAL section (unless SN_SOFO is used)
+     * round 3: SN_REPSAL section */
+    for (round = 1; round <= 3; ++round)
+    {
+	if (round == 1)
+	    gap = &spin->si_rep;
+	else if (round == 2)
+	{
+	    /* Don't write SN_SAL when using a SN_SOFO section */
+	    if (spin->si_sofofr != NULL && spin->si_sofoto != NULL)
+		continue;
+	    gap = &spin->si_sal;
+	}
+	else
+	    gap = &spin->si_repsal;
+
+	/* Don't write the section if there are no items. */
+	if (gap->ga_len == 0)
+	    continue;
+
+	/* Sort the REP/REPSAL items. */
+	if (round != 2)
+	    qsort(gap->ga_data, (size_t)gap->ga_len,
+					       sizeof(fromto_T), rep_compare);
+
+	i = round == 1 ? SN_REP : (round == 2 ? SN_SAL : SN_REPSAL);
+	putc(i, fd);					/* <sectionID> */
+
+	/* This is for making suggestions, section is not required. */
+	putc(0, fd);					/* <sectionflags> */
+
+	/* Compute the length of what follows. */
+	l = 2;	    /* count <repcount> or <salcount> */
+	for (i = 0; i < gap->ga_len; ++i)
+	{
+	    ftp = &((fromto_T *)gap->ga_data)[i];
+	    l += 1 + (int)STRLEN(ftp->ft_from);  /* count <*fromlen> and <*from> */
+	    l += 1 + (int)STRLEN(ftp->ft_to);    /* count <*tolen> and <*to> */
+	}
+	if (round == 2)
+	    ++l;	/* count <salflags> */
+	put_bytes(fd, (long_u)l, 4);			/* <sectionlen> */
+
+	if (round == 2)
+	{
+	    i = 0;
+	    if (spin->si_followup)
+		i |= SAL_F0LLOWUP;
+	    if (spin->si_collapse)
+		i |= SAL_COLLAPSE;
+	    if (spin->si_rem_accents)
+		i |= SAL_REM_ACCENTS;
+	    putc(i, fd);			/* <salflags> */
+	}
+
+	put_bytes(fd, (long_u)gap->ga_len, 2);	/* <repcount> or <salcount> */
+	for (i = 0; i < gap->ga_len; ++i)
+	{
+	    /* <rep> : <repfromlen> <repfrom> <reptolen> <repto> */
+	    /* <sal> : <salfromlen> <salfrom> <saltolen> <salto> */
+	    ftp = &((fromto_T *)gap->ga_data)[i];
+	    for (rr = 1; rr <= 2; ++rr)
+	    {
+		p = rr == 1 ? ftp->ft_from : ftp->ft_to;
+		l = (int)STRLEN(p);
+		putc(l, fd);
+		if (l > 0)
+		    fwv &= fwrite(p, l, (size_t)1, fd);
+	    }
+	}
+
+    }
+
+    /* SN_SOFO: <sofofromlen> <sofofrom> <sofotolen> <sofoto>
+     * This is for making suggestions, section is not required. */
+    if (spin->si_sofofr != NULL && spin->si_sofoto != NULL)
+    {
+	putc(SN_SOFO, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	l = (int)STRLEN(spin->si_sofofr);
+	put_bytes(fd, (long_u)(l + STRLEN(spin->si_sofoto) + 4), 4);
+							/* <sectionlen> */
+
+	put_bytes(fd, (long_u)l, 2);			/* <sofofromlen> */
+	fwv &= fwrite(spin->si_sofofr, l, (size_t)1, fd); /* <sofofrom> */
+
+	l = (int)STRLEN(spin->si_sofoto);
+	put_bytes(fd, (long_u)l, 2);			/* <sofotolen> */
+	fwv &= fwrite(spin->si_sofoto, l, (size_t)1, fd); /* <sofoto> */
+    }
+
+    /* SN_WORDS: <word> ...
+     * This is for making suggestions, section is not required. */
+    if (spin->si_commonwords.ht_used > 0)
+    {
+	putc(SN_WORDS, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	/* round 1: count the bytes
+	 * round 2: write the bytes */
+	for (round = 1; round <= 2; ++round)
+	{
+	    int		todo;
+	    int		len = 0;
+	    hashitem_T	*hi;
+
+	    todo = (int)spin->si_commonwords.ht_used;
+	    for (hi = spin->si_commonwords.ht_array; todo > 0; ++hi)
+		if (!HASHITEM_EMPTY(hi))
+		{
+		    l = (int)STRLEN(hi->hi_key) + 1;
+		    len += l;
+		    if (round == 2)			/* <word> */
+			fwv &= fwrite(hi->hi_key, (size_t)l, (size_t)1, fd);
+		    --todo;
+		}
+	    if (round == 1)
+		put_bytes(fd, (long_u)len, 4);		/* <sectionlen> */
+	}
+    }
+
+    /* SN_MAP: <mapstr>
+     * This is for making suggestions, section is not required. */
+    if (spin->si_map.ga_len > 0)
+    {
+	putc(SN_MAP, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+	l = spin->si_map.ga_len;
+	put_bytes(fd, (long_u)l, 4);			/* <sectionlen> */
+	fwv &= fwrite(spin->si_map.ga_data, (size_t)l, (size_t)1, fd);
+							/* <mapstr> */
+    }
+
+    /* SN_SUGFILE: <timestamp>
+     * This is used to notify that a .sug file may be available and at the
+     * same time allows for checking that a .sug file that is found matches
+     * with this .spl file.  That's because the word numbers must be exactly
+     * right. */
+    if (!spin->si_nosugfile
+	    && (spin->si_sal.ga_len > 0
+		     || (spin->si_sofofr != NULL && spin->si_sofoto != NULL)))
+    {
+	putc(SN_SUGFILE, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+	put_bytes(fd, (long_u)8, 4);			/* <sectionlen> */
+
+	/* Set si_sugtime and write it to the file. */
+	spin->si_sugtime = time(NULL);
+	put_time(fd, spin->si_sugtime);			/* <timestamp> */
+    }
+
+    /* SN_NOSPLITSUGS: nothing
+     * This is used to notify that no suggestions with word splits are to be
+     * made. */
+    if (spin->si_nosplitsugs)
+    {
+	putc(SN_NOSPLITSUGS, fd);			/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+	put_bytes(fd, (long_u)0, 4);			/* <sectionlen> */
+    }
+
+    /* SN_NOCOMPUNDSUGS: nothing
+     * This is used to notify that no suggestions with compounds are to be
+     * made. */
+    if (spin->si_nocompoundsugs)
+    {
+	putc(SN_NOCOMPOUNDSUGS, fd);			/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+	put_bytes(fd, (long_u)0, 4);			/* <sectionlen> */
+    }
+
+    /* SN_COMPOUND: compound info.
+     * We don't mark it required, when not supported all compound words will
+     * be bad words. */
+    if (spin->si_compflags != NULL)
+    {
+	putc(SN_COMPOUND, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	l = (int)STRLEN(spin->si_compflags);
+	for (i = 0; i < spin->si_comppat.ga_len; ++i)
+	    l += (int)STRLEN(((char_u **)(spin->si_comppat.ga_data))[i]) + 1;
+	put_bytes(fd, (long_u)(l + 7), 4);		/* <sectionlen> */
+
+	putc(spin->si_compmax, fd);			/* <compmax> */
+	putc(spin->si_compminlen, fd);			/* <compminlen> */
+	putc(spin->si_compsylmax, fd);			/* <compsylmax> */
+	putc(0, fd);		/* for Vim 7.0b compatibility */
+	putc(spin->si_compoptions, fd);			/* <compoptions> */
+	put_bytes(fd, (long_u)spin->si_comppat.ga_len, 2);
+							/* <comppatcount> */
+	for (i = 0; i < spin->si_comppat.ga_len; ++i)
+	{
+	    p = ((char_u **)(spin->si_comppat.ga_data))[i];
+	    putc((int)STRLEN(p), fd);			/* <comppatlen> */
+	    fwv &= fwrite(p, (size_t)STRLEN(p), (size_t)1, fd);
+							/* <comppattext> */
+	}
+							/* <compflags> */
+	fwv &= fwrite(spin->si_compflags, (size_t)STRLEN(spin->si_compflags),
+							       (size_t)1, fd);
+    }
+
+    /* SN_NOBREAK: NOBREAK flag */
+    if (spin->si_nobreak)
+    {
+	putc(SN_NOBREAK, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	/* It's empty, the presence of the section flags the feature. */
+	put_bytes(fd, (long_u)0, 4);			/* <sectionlen> */
+    }
+
+    /* SN_SYLLABLE: syllable info.
+     * We don't mark it required, when not supported syllables will not be
+     * counted. */
+    if (spin->si_syllable != NULL)
+    {
+	putc(SN_SYLLABLE, fd);				/* <sectionID> */
+	putc(0, fd);					/* <sectionflags> */
+
+	l = (int)STRLEN(spin->si_syllable);
+	put_bytes(fd, (long_u)l, 4);			/* <sectionlen> */
+	fwv &= fwrite(spin->si_syllable, (size_t)l, (size_t)1, fd);
+							/* <syllable> */
+    }
+
+    /* end of <SECTIONS> */
+    putc(SN_END, fd);					/* <sectionend> */
+
+
+    /*
+     * <LWORDTREE>  <KWORDTREE>  <PREFIXTREE>
+     */
+    spin->si_memtot = 0;
+    for (round = 1; round <= 3; ++round)
+    {
+	if (round == 1)
+	    tree = spin->si_foldroot->wn_sibling;
+	else if (round == 2)
+	    tree = spin->si_keeproot->wn_sibling;
+	else
+	    tree = spin->si_prefroot->wn_sibling;
+
+	/* Clear the index and wnode fields in the tree. */
+	clear_node(tree);
+
+	/* Count the number of nodes.  Needed to be able to allocate the
+	 * memory when reading the nodes.  Also fills in index for shared
+	 * nodes. */
+	nodecount = put_node(NULL, tree, 0, regionmask, round == 3);
+
+	/* number of nodes in 4 bytes */
+	put_bytes(fd, (long_u)nodecount, 4);	/* <nodecount> */
+	spin->si_memtot += nodecount + nodecount * sizeof(int);
+
+	/* Write the nodes. */
+	(void)put_node(fd, tree, 0, regionmask, round == 3);
+    }
+
+    /* Write another byte to check for errors (file system full). */
+    if (putc(0, fd) == EOF)
+	retval = FAIL;
+theend:
+    if (fclose(fd) == EOF)
+	retval = FAIL;
+
+    if (fwv != (size_t)1)
+	retval = FAIL;
+    if (retval == FAIL)
+	EMSG(_(e_write));
+
+    return retval;
+}
+
+/*
+ * Clear the index and wnode fields of "node", it siblings and its
+ * children.  This is needed because they are a union with other items to save
+ * space.
+ */
+    static void
+clear_node(wordnode_T *node)
+{
+    wordnode_T	*np;
+
+    if (node != NULL)
+	for (np = node; np != NULL; np = np->wn_sibling)
+	{
+	    np->wn_u1.index = 0;
+	    np->wn_u2.wnode = NULL;
+
+	    if (np->wn_byte != NUL)
+		clear_node(np->wn_child);
+	}
+}
+
+
+/*
+ * Dump a word tree at node "node".
+ *
+ * This first writes the list of possible bytes (siblings).  Then for each
+ * byte recursively write the children.
+ *
+ * NOTE: The code here must match the code in read_tree_node(), since
+ * assumptions are made about the indexes (so that we don't have to write them
+ * in the file).
+ *
+ * Returns the number of nodes used.
+ */
+    static int
+put_node(
+    FILE	*fd,		/* NULL when only counting */
+    wordnode_T	*node,
+    int		idx,
+    int		regionmask,
+    int		prefixtree)	/* TRUE for PREFIXTREE */
+{
+    int		newindex = idx;
+    int		siblingcount = 0;
+    wordnode_T	*np;
+    int		flags;
+
+    /* If "node" is zero the tree is empty. */
+    if (node == NULL)
+	return 0;
+
+    /* Store the index where this node is written. */
+    node->wn_u1.index = idx;
+
+    /* Count the number of siblings. */
+    for (np = node; np != NULL; np = np->wn_sibling)
+	++siblingcount;
+
+    /* Write the sibling count. */
+    if (fd != NULL)
+	putc(siblingcount, fd);				/* <siblingcount> */
+
+    /* Write each sibling byte and optionally extra info. */
+    for (np = node; np != NULL; np = np->wn_sibling)
+    {
+	if (np->wn_byte == 0)
+	{
+	    if (fd != NULL)
+	    {
+		/* For a NUL byte (end of word) write the flags etc. */
+		if (prefixtree)
+		{
+		    /* In PREFIXTREE write the required affixID and the
+		     * associated condition nr (stored in wn_region).  The
+		     * byte value is misused to store the "rare" and "not
+		     * combining" flags */
+		    if (np->wn_flags == (short_u)PFX_FLAGS)
+			putc(BY_NOFLAGS, fd);		/* <byte> */
+		    else
+		    {
+			putc(BY_FLAGS, fd);		/* <byte> */
+			putc(np->wn_flags, fd);		/* <pflags> */
+		    }
+		    putc(np->wn_affixID, fd);		/* <affixID> */
+		    put_bytes(fd, (long_u)np->wn_region, 2); /* <prefcondnr> */
+		}
+		else
+		{
+		    /* For word trees we write the flag/region items. */
+		    flags = np->wn_flags;
+		    if (regionmask != 0 && np->wn_region != regionmask)
+			flags |= WF_REGION;
+		    if (np->wn_affixID != 0)
+			flags |= WF_AFX;
+		    if (flags == 0)
+		    {
+			/* word without flags or region */
+			putc(BY_NOFLAGS, fd);			/* <byte> */
+		    }
+		    else
+		    {
+			if (np->wn_flags >= 0x100)
+			{
+			    putc(BY_FLAGS2, fd);		/* <byte> */
+			    putc(flags, fd);			/* <flags> */
+			    putc((unsigned)flags >> 8, fd);	/* <flags2> */
+			}
+			else
+			{
+			    putc(BY_FLAGS, fd);			/* <byte> */
+			    putc(flags, fd);			/* <flags> */
+			}
+			if (flags & WF_REGION)
+			    putc(np->wn_region, fd);		/* <region> */
+			if (flags & WF_AFX)
+			    putc(np->wn_affixID, fd);		/* <affixID> */
+		    }
+		}
+	    }
+	}
+	else
+	{
+	    if (np->wn_child->wn_u1.index != 0
+					 && np->wn_child->wn_u2.wnode != node)
+	    {
+		/* The child is written elsewhere, write the reference. */
+		if (fd != NULL)
+		{
+		    putc(BY_INDEX, fd);			/* <byte> */
+							/* <nodeidx> */
+		    put_bytes(fd, (long_u)np->wn_child->wn_u1.index, 3);
+		}
+	    }
+	    else if (np->wn_child->wn_u2.wnode == NULL)
+		/* We will write the child below and give it an index. */
+		np->wn_child->wn_u2.wnode = node;
+
+	    if (fd != NULL)
+		if (putc(np->wn_byte, fd) == EOF) /* <byte> or <xbyte> */
+		{
+		    EMSG(_(e_write));
+		    return 0;
+		}
+	}
+    }
+
+    /* Space used in the array when reading: one for each sibling and one for
+     * the count. */
+    newindex += siblingcount + 1;
+
+    /* Recursively dump the children of each sibling. */
+    for (np = node; np != NULL; np = np->wn_sibling)
+	if (np->wn_byte != 0 && np->wn_child->wn_u2.wnode == node)
+	    newindex = put_node(fd, np->wn_child, newindex, regionmask,
+								  prefixtree);
+
+    return newindex;
+}
+
+
+/*
+ * ":mkspell [-ascii] outfile  infile ..."
+ * ":mkspell [-ascii] addfile"
+ */
+    void
+ex_mkspell(exarg_T *eap)
+{
+    int		fcount;
+    char_u	**fnames;
+    char_u	*arg = eap->arg;
+    int		ascii = FALSE;
+
+    if (STRNCMP(arg, "-ascii", 6) == 0)
+    {
+	ascii = TRUE;
+	arg = skipwhite(arg + 6);
+    }
+
+    /* Expand all the remaining arguments (e.g., $VIMRUNTIME). */
+    if (get_arglist_exp(arg, &fcount, &fnames, FALSE) == OK)
+    {
+	mkspell(fcount, fnames, ascii, eap->forceit, FALSE);
+	FreeWild(fcount, fnames);
+    }
+}
+
+/*
+ * Create the .sug file.
+ * Uses the soundfold info in "spin".
+ * Writes the file with the name "wfname", with ".spl" changed to ".sug".
+ */
+    static void
+spell_make_sugfile(spellinfo_T *spin, char_u *wfname)
+{
+    char_u	*fname = NULL;
+    int		len;
+    slang_T	*slang;
+    int		free_slang = FALSE;
+
+    /*
+     * Read back the .spl file that was written.  This fills the required
+     * info for soundfolding.  This also uses less memory than the
+     * pointer-linked version of the trie.  And it avoids having two versions
+     * of the code for the soundfolding stuff.
+     * It might have been done already by spell_reload_one().
+     */
+    for (slang = first_lang; slang != NULL; slang = slang->sl_next)
+	if (fullpathcmp(wfname, slang->sl_fname, FALSE) == FPC_SAME)
+	    break;
+    if (slang == NULL)
+    {
+	spell_message(spin, (char_u *)_("Reading back spell file..."));
+	slang = spell_load_file(wfname, NULL, NULL, FALSE);
+	if (slang == NULL)
+	    return;
+	free_slang = TRUE;
+    }
+
+    /*
+     * Clear the info in "spin" that is used.
+     */
+    spin->si_blocks = NULL;
+    spin->si_blocks_cnt = 0;
+    spin->si_compress_cnt = 0;	    /* will stay at 0 all the time*/
+    spin->si_free_count = 0;
+    spin->si_first_free = NULL;
+    spin->si_foldwcount = 0;
+
+    /*
+     * Go through the trie of good words, soundfold each word and add it to
+     * the soundfold trie.
+     */
+    spell_message(spin, (char_u *)_("Performing soundfolding..."));
+    if (sug_filltree(spin, slang) == FAIL)
+	goto theend;
+
+    /*
+     * Create the table which links each soundfold word with a list of the
+     * good words it may come from.  Creates buffer "spin->si_spellbuf".
+     * This also removes the wordnr from the NUL byte entries to make
+     * compression possible.
+     */
+    if (sug_maketable(spin) == FAIL)
+	goto theend;
+
+    smsg((char_u *)_("Number of words after soundfolding: %ld"),
+				 (long)spin->si_spellbuf->b_ml.ml_line_count);
+
+    /*
+     * Compress the soundfold trie.
+     */
+    spell_message(spin, (char_u *)_(msg_compressing));
+    wordtree_compress(spin, spin->si_foldroot);
+
+    /*
+     * Write the .sug file.
+     * Make the file name by changing ".spl" to ".sug".
+     */
+    fname = alloc(MAXPATHL);
+    if (fname == NULL)
+	goto theend;
+    vim_strncpy(fname, wfname, MAXPATHL - 1);
+    len = (int)STRLEN(fname);
+    fname[len - 2] = 'u';
+    fname[len - 1] = 'g';
+    sug_write(spin, fname);
+
+theend:
+    vim_free(fname);
+    if (free_slang)
+	slang_free(slang);
+    free_blocks(spin->si_blocks);
+    close_spellbuf(spin->si_spellbuf);
+}
+
+/*
+ * Build the soundfold trie for language "slang".
+ */
+    static int
+sug_filltree(spellinfo_T *spin, slang_T *slang)
+{
+    char_u	*byts;
+    idx_T	*idxs;
+    int		depth;
+    idx_T	arridx[MAXWLEN];
+    int		curi[MAXWLEN];
+    char_u	tword[MAXWLEN];
+    char_u	tsalword[MAXWLEN];
+    int		c;
+    idx_T	n;
+    unsigned	words_done = 0;
+    int		wordcount[MAXWLEN];
+
+    /* We use si_foldroot for the soundfolded trie. */
+    spin->si_foldroot = wordtree_alloc(spin);
+    if (spin->si_foldroot == NULL)
+	return FAIL;
+
+    /* let tree_add_word() know we're adding to the soundfolded tree */
+    spin->si_sugtree = TRUE;
+
+    /*
+     * Go through the whole case-folded tree, soundfold each word and put it
+     * in the trie.
+     */
+    byts = slang->sl_fbyts;
+    idxs = slang->sl_fidxs;
+
+    arridx[0] = 0;
+    curi[0] = 1;
+    wordcount[0] = 0;
+
+    depth = 0;
+    while (depth >= 0 && !got_int)
+    {
+	if (curi[depth] > byts[arridx[depth]])
+	{
+	    /* Done all bytes at this node, go up one level. */
+	    idxs[arridx[depth]] = wordcount[depth];
+	    if (depth > 0)
+		wordcount[depth - 1] += wordcount[depth];
+
+	    --depth;
+	    line_breakcheck();
+	}
+	else
+	{
+
+	    /* Do one more byte at this node. */
+	    n = arridx[depth] + curi[depth];
+	    ++curi[depth];
+
+	    c = byts[n];
+	    if (c == 0)
+	    {
+		/* Sound-fold the word. */
+		tword[depth] = NUL;
+		spell_soundfold(slang, tword, TRUE, tsalword);
+
+		/* We use the "flags" field for the MSB of the wordnr,
+		 * "region" for the LSB of the wordnr.  */
+		if (tree_add_word(spin, tsalword, spin->si_foldroot,
+				words_done >> 16, words_done & 0xffff,
+							   0) == FAIL)
+		    return FAIL;
+
+		++words_done;
+		++wordcount[depth];
+
+		/* Reset the block count each time to avoid compression
+		 * kicking in. */
+		spin->si_blocks_cnt = 0;
+
+		/* Skip over any other NUL bytes (same word with different
+		 * flags). */
+		while (byts[n + 1] == 0)
+		{
+		    ++n;
+		    ++curi[depth];
+		}
+	    }
+	    else
+	    {
+		/* Normal char, go one level deeper. */
+		tword[depth++] = c;
+		arridx[depth] = idxs[n];
+		curi[depth] = 1;
+		wordcount[depth] = 0;
+	    }
+	}
+    }
+
+    smsg((char_u *)_("Total number of words: %d"), words_done);
+
+    return OK;
+}
+
+/*
+ * Make the table that links each word in the soundfold trie to the words it
+ * can be produced from.
+ * This is not unlike lines in a file, thus use a memfile to be able to access
+ * the table efficiently.
+ * Returns FAIL when out of memory.
+ */
+    static int
+sug_maketable(spellinfo_T *spin)
+{
+    garray_T	ga;
+    int		res = OK;
+
+    /* Allocate a buffer, open a memline for it and create the swap file
+     * (uses a temp file, not a .swp file). */
+    spin->si_spellbuf = open_spellbuf();
+    if (spin->si_spellbuf == NULL)
+	return FAIL;
+
+    /* Use a buffer to store the line info, avoids allocating many small
+     * pieces of memory. */
+    ga_init2(&ga, 1, 100);
+
+    /* recursively go through the tree */
+    if (sug_filltable(spin, spin->si_foldroot->wn_sibling, 0, &ga) == -1)
+	res = FAIL;
+
+    ga_clear(&ga);
+    return res;
+}
+
+/*
+ * Fill the table for one node and its children.
+ * Returns the wordnr at the start of the node.
+ * Returns -1 when out of memory.
+ */
+    static int
+sug_filltable(
+    spellinfo_T	*spin,
+    wordnode_T	*node,
+    int		startwordnr,
+    garray_T	*gap)	    /* place to store line of numbers */
+{
+    wordnode_T	*p, *np;
+    int		wordnr = startwordnr;
+    int		nr;
+    int		prev_nr;
+
+    for (p = node; p != NULL; p = p->wn_sibling)
+    {
+	if (p->wn_byte == NUL)
+	{
+	    gap->ga_len = 0;
+	    prev_nr = 0;
+	    for (np = p; np != NULL && np->wn_byte == NUL; np = np->wn_sibling)
+	    {
+		if (ga_grow(gap, 10) == FAIL)
+		    return -1;
+
+		nr = (np->wn_flags << 16) + (np->wn_region & 0xffff);
+		/* Compute the offset from the previous nr and store the
+		 * offset in a way that it takes a minimum number of bytes.
+		 * It's a bit like utf-8, but without the need to mark
+		 * following bytes. */
+		nr -= prev_nr;
+		prev_nr += nr;
+		gap->ga_len += offset2bytes(nr,
+					 (char_u *)gap->ga_data + gap->ga_len);
+	    }
+
+	    /* add the NUL byte */
+	    ((char_u *)gap->ga_data)[gap->ga_len++] = NUL;
+
+	    if (ml_append_buf(spin->si_spellbuf, (linenr_T)wordnr,
+				     gap->ga_data, gap->ga_len, TRUE) == FAIL)
+		return -1;
+	    ++wordnr;
+
+	    /* Remove extra NUL entries, we no longer need them. We don't
+	     * bother freeing the nodes, the won't be reused anyway. */
+	    while (p->wn_sibling != NULL && p->wn_sibling->wn_byte == NUL)
+		p->wn_sibling = p->wn_sibling->wn_sibling;
+
+	    /* Clear the flags on the remaining NUL node, so that compression
+	     * works a lot better. */
+	    p->wn_flags = 0;
+	    p->wn_region = 0;
+	}
+	else
+	{
+	    wordnr = sug_filltable(spin, p->wn_child, wordnr, gap);
+	    if (wordnr == -1)
+		return -1;
+	}
+    }
+    return wordnr;
+}
+
+/*
+ * Convert an offset into a minimal number of bytes.
+ * Similar to utf_char2byters, but use 8 bits in followup bytes and avoid NUL
+ * bytes.
+ */
+    static int
+offset2bytes(int nr, char_u *buf)
+{
+    int	    rem;
+    int	    b1, b2, b3, b4;
+
+    /* Split the number in parts of base 255.  We need to avoid NUL bytes. */
+    b1 = nr % 255 + 1;
+    rem = nr / 255;
+    b2 = rem % 255 + 1;
+    rem = rem / 255;
+    b3 = rem % 255 + 1;
+    b4 = rem / 255 + 1;
+
+    if (b4 > 1 || b3 > 0x1f)	/* 4 bytes */
+    {
+	buf[0] = 0xe0 + b4;
+	buf[1] = b3;
+	buf[2] = b2;
+	buf[3] = b1;
+	return 4;
+    }
+    if (b3 > 1 || b2 > 0x3f )	/* 3 bytes */
+    {
+	buf[0] = 0xc0 + b3;
+	buf[1] = b2;
+	buf[2] = b1;
+	return 3;
+    }
+    if (b2 > 1 || b1 > 0x7f )	/* 2 bytes */
+    {
+	buf[0] = 0x80 + b2;
+	buf[1] = b1;
+	return 2;
+    }
+				/* 1 byte */
+    buf[0] = b1;
+    return 1;
+}
+
+/*
+ * Write the .sug file in "fname".
+ */
+    static void
+sug_write(spellinfo_T *spin, char_u *fname)
+{
+    FILE	*fd;
+    wordnode_T	*tree;
+    int		nodecount;
+    int		wcount;
+    char_u	*line;
+    linenr_T	lnum;
+    int		len;
+
+    /* Create the file.  Note that an existing file is silently overwritten! */
+    fd = mch_fopen((char *)fname, "w");
+    if (fd == NULL)
+    {
+	EMSG2(_(e_notopen), fname);
+	return;
+    }
+
+    vim_snprintf((char *)IObuff, IOSIZE,
+				  _("Writing suggestion file %s ..."), fname);
+    spell_message(spin, IObuff);
+
+    /*
+     * <SUGHEADER>: <fileID> <versionnr> <timestamp>
+     */
+    if (fwrite(VIMSUGMAGIC, VIMSUGMAGICL, (size_t)1, fd) != 1) /* <fileID> */
+    {
+	EMSG(_(e_write));
+	goto theend;
+    }
+    putc(VIMSUGVERSION, fd);				/* <versionnr> */
+
+    /* Write si_sugtime to the file. */
+    put_time(fd, spin->si_sugtime);			/* <timestamp> */
+
+    /*
+     * <SUGWORDTREE>
+     */
+    spin->si_memtot = 0;
+    tree = spin->si_foldroot->wn_sibling;
+
+    /* Clear the index and wnode fields in the tree. */
+    clear_node(tree);
+
+    /* Count the number of nodes.  Needed to be able to allocate the
+     * memory when reading the nodes.  Also fills in index for shared
+     * nodes. */
+    nodecount = put_node(NULL, tree, 0, 0, FALSE);
+
+    /* number of nodes in 4 bytes */
+    put_bytes(fd, (long_u)nodecount, 4);	/* <nodecount> */
+    spin->si_memtot += nodecount + nodecount * sizeof(int);
+
+    /* Write the nodes. */
+    (void)put_node(fd, tree, 0, 0, FALSE);
+
+    /*
+     * <SUGTABLE>: <sugwcount> <sugline> ...
+     */
+    wcount = spin->si_spellbuf->b_ml.ml_line_count;
+    put_bytes(fd, (long_u)wcount, 4);	/* <sugwcount> */
+
+    for (lnum = 1; lnum <= (linenr_T)wcount; ++lnum)
+    {
+	/* <sugline>: <sugnr> ... NUL */
+	line = ml_get_buf(spin->si_spellbuf, lnum, FALSE);
+	len = (int)STRLEN(line) + 1;
+	if (fwrite(line, (size_t)len, (size_t)1, fd) == 0)
+	{
+	    EMSG(_(e_write));
+	    goto theend;
+	}
+	spin->si_memtot += len;
+    }
+
+    /* Write another byte to check for errors. */
+    if (putc(0, fd) == EOF)
+	EMSG(_(e_write));
+
+    vim_snprintf((char *)IObuff, IOSIZE,
+		 _("Estimated runtime memory use: %d bytes"), spin->si_memtot);
+    spell_message(spin, IObuff);
+
+theend:
+    /* close the file */
+    fclose(fd);
+}
+
+
+/*
+ * Create a Vim spell file from one or more word lists.
+ * "fnames[0]" is the output file name.
+ * "fnames[fcount - 1]" is the last input file name.
+ * Exception: when "fnames[0]" ends in ".add" it's used as the input file name
+ * and ".spl" is appended to make the output file name.
+ */
+    void
+mkspell(
+    int		fcount,
+    char_u	**fnames,
+    int		ascii,		    /* -ascii argument given */
+    int		over_write,	    /* overwrite existing output file */
+    int		added_word)	    /* invoked through "zg" */
+{
+    char_u	*fname = NULL;
+    char_u	*wfname;
+    char_u	**innames;
+    int		incount;
+    afffile_T	*(afile[8]);
+    int		i;
+    int		len;
+    stat_T	st;
+    int		error = FALSE;
+    spellinfo_T spin;
+
+    vim_memset(&spin, 0, sizeof(spin));
+    spin.si_verbose = !added_word;
+    spin.si_ascii = ascii;
+    spin.si_followup = TRUE;
+    spin.si_rem_accents = TRUE;
+    ga_init2(&spin.si_rep, (int)sizeof(fromto_T), 20);
+    ga_init2(&spin.si_repsal, (int)sizeof(fromto_T), 20);
+    ga_init2(&spin.si_sal, (int)sizeof(fromto_T), 20);
+    ga_init2(&spin.si_map, (int)sizeof(char_u), 100);
+    ga_init2(&spin.si_comppat, (int)sizeof(char_u *), 20);
+    ga_init2(&spin.si_prefcond, (int)sizeof(char_u *), 50);
+    hash_init(&spin.si_commonwords);
+    spin.si_newcompID = 127;	/* start compound ID at first maximum */
+
+    /* default: fnames[0] is output file, following are input files */
+    innames = &fnames[1];
+    incount = fcount - 1;
+
+    wfname = alloc(MAXPATHL);
+    if (wfname == NULL)
+	return;
+
+    if (fcount >= 1)
+    {
+	len = (int)STRLEN(fnames[0]);
+	if (fcount == 1 && len > 4 && STRCMP(fnames[0] + len - 4, ".add") == 0)
+	{
+	    /* For ":mkspell path/en.latin1.add" output file is
+	     * "path/en.latin1.add.spl". */
+	    innames = &fnames[0];
+	    incount = 1;
+	    vim_snprintf((char *)wfname, MAXPATHL, "%s.spl", fnames[0]);
+	}
+	else if (fcount == 1)
+	{
+	    /* For ":mkspell path/vim" output file is "path/vim.latin1.spl". */
+	    innames = &fnames[0];
+	    incount = 1;
+	    vim_snprintf((char *)wfname, MAXPATHL, SPL_FNAME_TMPL,
+		  fnames[0], spin.si_ascii ? (char_u *)"ascii" : spell_enc());
+	}
+	else if (len > 4 && STRCMP(fnames[0] + len - 4, ".spl") == 0)
+	{
+	    /* Name ends in ".spl", use as the file name. */
+	    vim_strncpy(wfname, fnames[0], MAXPATHL - 1);
+	}
+	else
+	    /* Name should be language, make the file name from it. */
+	    vim_snprintf((char *)wfname, MAXPATHL, SPL_FNAME_TMPL,
+		  fnames[0], spin.si_ascii ? (char_u *)"ascii" : spell_enc());
+
+	/* Check for .ascii.spl. */
+	if (strstr((char *)gettail(wfname), SPL_FNAME_ASCII) != NULL)
+	    spin.si_ascii = TRUE;
+
+	/* Check for .add.spl. */
+	if (strstr((char *)gettail(wfname), SPL_FNAME_ADD) != NULL)
+	    spin.si_add = TRUE;
+    }
+
+    if (incount <= 0)
+	EMSG(_(e_invarg));	/* need at least output and input names */
+    else if (vim_strchr(gettail(wfname), '_') != NULL)
+	EMSG(_("E751: Output file name must not have region name"));
+    else if (incount > 8)
+	EMSG(_("E754: Only up to 8 regions supported"));
+    else
+    {
+	/* Check for overwriting before doing things that may take a lot of
+	 * time. */
+	if (!over_write && mch_stat((char *)wfname, &st) >= 0)
+	{
+	    EMSG(_(e_exists));
+	    goto theend;
+	}
+	if (mch_isdir(wfname))
+	{
+	    EMSG2(_(e_isadir2), wfname);
+	    goto theend;
+	}
+
+	fname = alloc(MAXPATHL);
+	if (fname == NULL)
+	    goto theend;
+
+	/*
+	 * Init the aff and dic pointers.
+	 * Get the region names if there are more than 2 arguments.
+	 */
+	for (i = 0; i < incount; ++i)
+	{
+	    afile[i] = NULL;
+
+	    if (incount > 1)
+	    {
+		len = (int)STRLEN(innames[i]);
+		if (STRLEN(gettail(innames[i])) < 5
+						|| innames[i][len - 3] != '_')
+		{
+		    EMSG2(_("E755: Invalid region in %s"), innames[i]);
+		    goto theend;
+		}
+		spin.si_region_name[i * 2] = TOLOWER_ASC(innames[i][len - 2]);
+		spin.si_region_name[i * 2 + 1] =
+					     TOLOWER_ASC(innames[i][len - 1]);
+	    }
+	}
+	spin.si_region_count = incount;
+
+	spin.si_foldroot = wordtree_alloc(&spin);
+	spin.si_keeproot = wordtree_alloc(&spin);
+	spin.si_prefroot = wordtree_alloc(&spin);
+	if (spin.si_foldroot == NULL
+		|| spin.si_keeproot == NULL
+		|| spin.si_prefroot == NULL)
+	{
+	    free_blocks(spin.si_blocks);
+	    goto theend;
+	}
+
+	/* When not producing a .add.spl file clear the character table when
+	 * we encounter one in the .aff file.  This means we dump the current
+	 * one in the .spl file if the .aff file doesn't define one.  That's
+	 * better than guessing the contents, the table will match a
+	 * previously loaded spell file. */
+	if (!spin.si_add)
+	    spin.si_clear_chartab = TRUE;
+
+	/*
+	 * Read all the .aff and .dic files.
+	 * Text is converted to 'encoding'.
+	 * Words are stored in the case-folded and keep-case trees.
+	 */
+	for (i = 0; i < incount && !error; ++i)
+	{
+	    spin.si_conv.vc_type = CONV_NONE;
+	    spin.si_region = 1 << i;
+
+	    vim_snprintf((char *)fname, MAXPATHL, "%s.aff", innames[i]);
+	    if (mch_stat((char *)fname, &st) >= 0)
+	    {
+		/* Read the .aff file.  Will init "spin->si_conv" based on the
+		 * "SET" line. */
+		afile[i] = spell_read_aff(&spin, fname);
+		if (afile[i] == NULL)
+		    error = TRUE;
+		else
+		{
+		    /* Read the .dic file and store the words in the trees. */
+		    vim_snprintf((char *)fname, MAXPATHL, "%s.dic",
+								  innames[i]);
+		    if (spell_read_dic(&spin, fname, afile[i]) == FAIL)
+			error = TRUE;
+		}
+	    }
+	    else
+	    {
+		/* No .aff file, try reading the file as a word list.  Store
+		 * the words in the trees. */
+		if (spell_read_wordfile(&spin, innames[i]) == FAIL)
+		    error = TRUE;
+	    }
+
+#ifdef FEAT_MBYTE
+	    /* Free any conversion stuff. */
+	    convert_setup(&spin.si_conv, NULL, NULL);
+#endif
+	}
+
+	if (spin.si_compflags != NULL && spin.si_nobreak)
+	    MSG(_("Warning: both compounding and NOBREAK specified"));
+
+	if (!error && !got_int)
+	{
+	    /*
+	     * Combine tails in the tree.
+	     */
+	    spell_message(&spin, (char_u *)_(msg_compressing));
+	    wordtree_compress(&spin, spin.si_foldroot);
+	    wordtree_compress(&spin, spin.si_keeproot);
+	    wordtree_compress(&spin, spin.si_prefroot);
+	}
+
+	if (!error && !got_int)
+	{
+	    /*
+	     * Write the info in the spell file.
+	     */
+	    vim_snprintf((char *)IObuff, IOSIZE,
+				      _("Writing spell file %s ..."), wfname);
+	    spell_message(&spin, IObuff);
+
+	    error = write_vim_spell(&spin, wfname) == FAIL;
+
+	    spell_message(&spin, (char_u *)_("Done!"));
+	    vim_snprintf((char *)IObuff, IOSIZE,
+		 _("Estimated runtime memory use: %d bytes"), spin.si_memtot);
+	    spell_message(&spin, IObuff);
+
+	    /*
+	     * If the file is loaded need to reload it.
+	     */
+	    if (!error)
+		spell_reload_one(wfname, added_word);
+	}
+
+	/* Free the allocated memory. */
+	ga_clear(&spin.si_rep);
+	ga_clear(&spin.si_repsal);
+	ga_clear(&spin.si_sal);
+	ga_clear(&spin.si_map);
+	ga_clear(&spin.si_comppat);
+	ga_clear(&spin.si_prefcond);
+	hash_clear_all(&spin.si_commonwords, 0);
+
+	/* Free the .aff file structures. */
+	for (i = 0; i < incount; ++i)
+	    if (afile[i] != NULL)
+		spell_free_aff(afile[i]);
+
+	/* Free all the bits and pieces at once. */
+	free_blocks(spin.si_blocks);
+
+	/*
+	 * If there is soundfolding info and no NOSUGFILE item create the
+	 * .sug file with the soundfolded word trie.
+	 */
+	if (spin.si_sugtime != 0 && !error && !got_int)
+	    spell_make_sugfile(&spin, wfname);
+
+    }
+
+theend:
+    vim_free(fname);
+    vim_free(wfname);
+}
+
+/*
+ * Display a message for spell file processing when 'verbose' is set or using
+ * ":mkspell".  "str" can be IObuff.
+ */
+    static void
+spell_message(spellinfo_T *spin, char_u *str)
+{
+    if (spin->si_verbose || p_verbose > 2)
+    {
+	if (!spin->si_verbose)
+	    verbose_enter();
+	MSG(str);
+	out_flush();
+	if (!spin->si_verbose)
+	    verbose_leave();
+    }
+}
+
+/*
+ * ":[count]spellgood  {word}"
+ * ":[count]spellwrong  {word}"
+ * ":[count]spellundo  {word}"
+ */
+    void
+ex_spell(exarg_T *eap)
+{
+    spell_add_word(eap->arg, (int)STRLEN(eap->arg), eap->cmdidx == CMD_spellwrong,
+				   eap->forceit ? 0 : (int)eap->line2,
+				   eap->cmdidx == CMD_spellundo);
+}
+
+/*
+ * Add "word[len]" to 'spellfile' as a good or bad word.
+ */
+    void
+spell_add_word(
+    char_u	*word,
+    int		len,
+    int		bad,
+    int		idx,	    /* "zG" and "zW": zero, otherwise index in
+			       'spellfile' */
+    int		undo)	    /* TRUE for "zug", "zuG", "zuw" and "zuW" */
+{
+    FILE	*fd = NULL;
+    buf_T	*buf = NULL;
+    int		new_spf = FALSE;
+    char_u	*fname;
+    char_u	*fnamebuf = NULL;
+    char_u	line[MAXWLEN * 2];
+    long	fpos, fpos_next = 0;
+    int		i;
+    char_u	*spf;
+
+    if (idx == 0)	    /* use internal wordlist */
+    {
+	if (int_wordlist == NULL)
+	{
+	    int_wordlist = vim_tempname('s', FALSE);
+	    if (int_wordlist == NULL)
+		return;
+	}
+	fname = int_wordlist;
+    }
+    else
+    {
+	/* If 'spellfile' isn't set figure out a good default value. */
+	if (*curwin->w_s->b_p_spf == NUL)
+	{
+	    init_spellfile();
+	    new_spf = TRUE;
+	}
+
+	if (*curwin->w_s->b_p_spf == NUL)
+	{
+	    EMSG2(_(e_notset), "spellfile");
+	    return;
+	}
+	fnamebuf = alloc(MAXPATHL);
+	if (fnamebuf == NULL)
+	    return;
+
+	for (spf = curwin->w_s->b_p_spf, i = 1; *spf != NUL; ++i)
+	{
+	    copy_option_part(&spf, fnamebuf, MAXPATHL, ",");
+	    if (i == idx)
+		break;
+	    if (*spf == NUL)
+	    {
+		EMSGN(_("E765: 'spellfile' does not have %ld entries"), idx);
+		vim_free(fnamebuf);
+		return;
+	    }
+	}
+
+	/* Check that the user isn't editing the .add file somewhere. */
+	buf = buflist_findname_exp(fnamebuf);
+	if (buf != NULL && buf->b_ml.ml_mfp == NULL)
+	    buf = NULL;
+	if (buf != NULL && bufIsChanged(buf))
+	{
+	    EMSG(_(e_bufloaded));
+	    vim_free(fnamebuf);
+	    return;
+	}
+
+	fname = fnamebuf;
+    }
+
+    if (bad || undo)
+    {
+	/* When the word appears as good word we need to remove that one,
+	 * since its flags sort before the one with WF_BANNED. */
+	fd = mch_fopen((char *)fname, "r");
+	if (fd != NULL)
+	{
+	    while (!vim_fgets(line, MAXWLEN * 2, fd))
+	    {
+		fpos = fpos_next;
+		fpos_next = ftell(fd);
+		if (STRNCMP(word, line, len) == 0
+			&& (line[len] == '/' || line[len] < ' '))
+		{
+		    /* Found duplicate word.  Remove it by writing a '#' at
+		     * the start of the line.  Mixing reading and writing
+		     * doesn't work for all systems, close the file first. */
+		    fclose(fd);
+		    fd = mch_fopen((char *)fname, "r+");
+		    if (fd == NULL)
+			break;
+		    if (fseek(fd, fpos, SEEK_SET) == 0)
+		    {
+			fputc('#', fd);
+			if (undo)
+			{
+			    home_replace(NULL, fname, NameBuff, MAXPATHL, TRUE);
+			    smsg((char_u *)_("Word '%.*s' removed from %s"),
+							 len, word, NameBuff);
+			}
+		    }
+		    fseek(fd, fpos_next, SEEK_SET);
+		}
+	    }
+	    if (fd != NULL)
+		fclose(fd);
+	}
+    }
+
+    if (!undo)
+    {
+	fd = mch_fopen((char *)fname, "a");
+	if (fd == NULL && new_spf)
+	{
+	    char_u *p;
+
+	    /* We just initialized the 'spellfile' option and can't open the
+	     * file.  We may need to create the "spell" directory first.  We
+	     * already checked the runtime directory is writable in
+	     * init_spellfile(). */
+	    if (!dir_of_file_exists(fname) && (p = gettail_sep(fname)) != fname)
+	    {
+		int c = *p;
+
+		/* The directory doesn't exist.  Try creating it and opening
+		 * the file again. */
+		*p = NUL;
+		vim_mkdir(fname, 0755);
+		*p = c;
+		fd = mch_fopen((char *)fname, "a");
+	    }
+	}
+
+	if (fd == NULL)
+	    EMSG2(_(e_notopen), fname);
+	else
+	{
+	    if (bad)
+		fprintf(fd, "%.*s/!\n", len, word);
+	    else
+		fprintf(fd, "%.*s\n", len, word);
+	    fclose(fd);
+
+	    home_replace(NULL, fname, NameBuff, MAXPATHL, TRUE);
+	    smsg((char_u *)_("Word '%.*s' added to %s"), len, word, NameBuff);
+	}
+    }
+
+    if (fd != NULL)
+    {
+	/* Update the .add.spl file. */
+	mkspell(1, &fname, FALSE, TRUE, TRUE);
+
+	/* If the .add file is edited somewhere, reload it. */
+	if (buf != NULL)
+	    buf_reload(buf, buf->b_orig_mode);
+
+	redraw_all_later(SOME_VALID);
+    }
+    vim_free(fnamebuf);
+}
+
+/*
+ * Initialize 'spellfile' for the current buffer.
+ */
+    static void
+init_spellfile(void)
+{
+    char_u	*buf;
+    int		l;
+    char_u	*fname;
+    char_u	*rtp;
+    char_u	*lend;
+    int		aspath = FALSE;
+    char_u	*lstart = curbuf->b_s.b_p_spl;
+
+    if (*curwin->w_s->b_p_spl != NUL && curwin->w_s->b_langp.ga_len > 0)
+    {
+	buf = alloc(MAXPATHL);
+	if (buf == NULL)
+	    return;
+
+	/* Find the end of the language name.  Exclude the region.  If there
+	 * is a path separator remember the start of the tail. */
+	for (lend = curwin->w_s->b_p_spl; *lend != NUL
+			&& vim_strchr((char_u *)",._", *lend) == NULL; ++lend)
+	    if (vim_ispathsep(*lend))
+	    {
+		aspath = TRUE;
+		lstart = lend + 1;
+	    }
+
+	/* Loop over all entries in 'runtimepath'.  Use the first one where we
+	 * are allowed to write. */
+	rtp = p_rtp;
+	while (*rtp != NUL)
+	{
+	    if (aspath)
+		/* Use directory of an entry with path, e.g., for
+		 * "/dir/lg.utf-8.spl" use "/dir". */
+		vim_strncpy(buf, curbuf->b_s.b_p_spl,
+					    lstart - curbuf->b_s.b_p_spl - 1);
+	    else
+		/* Copy the path from 'runtimepath' to buf[]. */
+		copy_option_part(&rtp, buf, MAXPATHL, ",");
+	    if (filewritable(buf) == 2)
+	    {
+		/* Use the first language name from 'spelllang' and the
+		 * encoding used in the first loaded .spl file. */
+		if (aspath)
+		    vim_strncpy(buf, curbuf->b_s.b_p_spl,
+						  lend - curbuf->b_s.b_p_spl);
+		else
+		{
+		    /* Create the "spell" directory if it doesn't exist yet. */
+		    l = (int)STRLEN(buf);
+		    vim_snprintf((char *)buf + l, MAXPATHL - l, "/spell");
+		    if (filewritable(buf) != 2)
+			vim_mkdir(buf, 0755);
+
+		    l = (int)STRLEN(buf);
+		    vim_snprintf((char *)buf + l, MAXPATHL - l,
+				 "/%.*s", (int)(lend - lstart), lstart);
+		}
+		l = (int)STRLEN(buf);
+		fname = LANGP_ENTRY(curwin->w_s->b_langp, 0)
+							 ->lp_slang->sl_fname;
+		vim_snprintf((char *)buf + l, MAXPATHL - l, ".%s.add",
+			fname != NULL
+			  && strstr((char *)gettail(fname), ".ascii.") != NULL
+				       ? (char_u *)"ascii" : spell_enc());
+		set_option_value((char_u *)"spellfile", 0L, buf, OPT_LOCAL);
+		break;
+	    }
+	    aspath = FALSE;
+	}
+
+	vim_free(buf);
+    }
+}
+
+
+
+/*
+ * Set the spell character tables from strings in the affix file.
+ */
+    static int
+set_spell_chartab(char_u *fol, char_u *low, char_u *upp)
+{
+    /* We build the new tables here first, so that we can compare with the
+     * previous one. */
+    spelltab_T	new_st;
+    char_u	*pf = fol, *pl = low, *pu = upp;
+    int		f, l, u;
+
+    clear_spell_chartab(&new_st);
+
+    while (*pf != NUL)
+    {
+	if (*pl == NUL || *pu == NUL)
+	{
+	    EMSG(_(e_affform));
+	    return FAIL;
+	}
+#ifdef FEAT_MBYTE
+	f = mb_ptr2char_adv(&pf);
+	l = mb_ptr2char_adv(&pl);
+	u = mb_ptr2char_adv(&pu);
+#else
+	f = *pf++;
+	l = *pl++;
+	u = *pu++;
+#endif
+	/* Every character that appears is a word character. */
+	if (f < 256)
+	    new_st.st_isw[f] = TRUE;
+	if (l < 256)
+	    new_st.st_isw[l] = TRUE;
+	if (u < 256)
+	    new_st.st_isw[u] = TRUE;
+
+	/* if "LOW" and "FOL" are not the same the "LOW" char needs
+	 * case-folding */
+	if (l < 256 && l != f)
+	{
+	    if (f >= 256)
+	    {
+		EMSG(_(e_affrange));
+		return FAIL;
+	    }
+	    new_st.st_fold[l] = f;
+	}
+
+	/* if "UPP" and "FOL" are not the same the "UPP" char needs
+	 * case-folding, it's upper case and the "UPP" is the upper case of
+	 * "FOL" . */
+	if (u < 256 && u != f)
+	{
+	    if (f >= 256)
+	    {
+		EMSG(_(e_affrange));
+		return FAIL;
+	    }
+	    new_st.st_fold[u] = f;
+	    new_st.st_isu[u] = TRUE;
+	    new_st.st_upper[f] = u;
+	}
+    }
+
+    if (*pl != NUL || *pu != NUL)
+    {
+	EMSG(_(e_affform));
+	return FAIL;
+    }
+
+    return set_spell_finish(&new_st);
+}
+
+/*
+ * Set the spell character tables from strings in the .spl file.
+ */
+    static void
+set_spell_charflags(
+    char_u	*flags,
+    int		cnt,	    /* length of "flags" */
+    char_u	*fol)
+{
+    /* We build the new tables here first, so that we can compare with the
+     * previous one. */
+    spelltab_T	new_st;
+    int		i;
+    char_u	*p = fol;
+    int		c;
+
+    clear_spell_chartab(&new_st);
+
+    for (i = 0; i < 128; ++i)
+    {
+	if (i < cnt)
+	{
+	    new_st.st_isw[i + 128] = (flags[i] & CF_WORD) != 0;
+	    new_st.st_isu[i + 128] = (flags[i] & CF_UPPER) != 0;
+	}
+
+	if (*p != NUL)
+	{
+#ifdef FEAT_MBYTE
+	    c = mb_ptr2char_adv(&p);
+#else
+	    c = *p++;
+#endif
+	    new_st.st_fold[i + 128] = c;
+	    if (i + 128 != c && new_st.st_isu[i + 128] && c < 256)
+		new_st.st_upper[c] = i + 128;
+	}
+    }
+
+    (void)set_spell_finish(&new_st);
+}
+
+    static int
+set_spell_finish(spelltab_T *new_st)
+{
+    int		i;
+
+    if (did_set_spelltab)
+    {
+	/* check that it's the same table */
+	for (i = 0; i < 256; ++i)
+	{
+	    if (spelltab.st_isw[i] != new_st->st_isw[i]
+		    || spelltab.st_isu[i] != new_st->st_isu[i]
+		    || spelltab.st_fold[i] != new_st->st_fold[i]
+		    || spelltab.st_upper[i] != new_st->st_upper[i])
+	    {
+		EMSG(_("E763: Word characters differ between spell files"));
+		return FAIL;
+	    }
+	}
+    }
+    else
+    {
+	/* copy the new spelltab into the one being used */
+	spelltab = *new_st;
+	did_set_spelltab = TRUE;
+    }
+
+    return OK;
+}
+
+/*
+ * Write the table with prefix conditions to the .spl file.
+ * When "fd" is NULL only count the length of what is written.
+ */
+    static int
+write_spell_prefcond(FILE *fd, garray_T *gap)
+{
+    int		i;
+    char_u	*p;
+    int		len;
+    int		totlen;
+    size_t	x = 1;  /* collect return value of fwrite() */
+
+    if (fd != NULL)
+	put_bytes(fd, (long_u)gap->ga_len, 2);	    /* <prefcondcnt> */
+
+    totlen = 2 + gap->ga_len; /* length of <prefcondcnt> and <condlen> bytes */
+
+    for (i = 0; i < gap->ga_len; ++i)
+    {
+	/* <prefcond> : <condlen> <condstr> */
+	p = ((char_u **)gap->ga_data)[i];
+	if (p != NULL)
+	{
+	    len = (int)STRLEN(p);
+	    if (fd != NULL)
+	    {
+		fputc(len, fd);
+		x &= fwrite(p, (size_t)len, (size_t)1, fd);
+	    }
+	    totlen += len;
+	}
+	else if (fd != NULL)
+	    fputc(0, fd);
+    }
+
+    return totlen;
+}
+
+
+/*
+ * Use map string "map" for languages "lp".
+ */
+    static void
+set_map_str(slang_T *lp, char_u *map)
+{
+    char_u	*p;
+    int		headc = 0;
+    int		c;
+    int		i;
+
+    if (*map == NUL)
+    {
+	lp->sl_has_map = FALSE;
+	return;
+    }
+    lp->sl_has_map = TRUE;
+
+    /* Init the array and hash tables empty. */
+    for (i = 0; i < 256; ++i)
+	lp->sl_map_array[i] = 0;
+#ifdef FEAT_MBYTE
+    hash_init(&lp->sl_map_hash);
+#endif
+
+    /*
+     * The similar characters are stored separated with slashes:
+     * "aaa/bbb/ccc/".  Fill sl_map_array[c] with the character before c and
+     * before the same slash.  For characters above 255 sl_map_hash is used.
+     */
+    for (p = map; *p != NUL; )
+    {
+#ifdef FEAT_MBYTE
+	c = mb_cptr2char_adv(&p);
+#else
+	c = *p++;
+#endif
+	if (c == '/')
+	    headc = 0;
+	else
+	{
+	    if (headc == 0)
+		 headc = c;
+
+#ifdef FEAT_MBYTE
+	    /* Characters above 255 don't fit in sl_map_array[], put them in
+	     * the hash table.  Each entry is the char, a NUL the headchar and
+	     * a NUL. */
+	    if (c >= 256)
+	    {
+		int	    cl = mb_char2len(c);
+		int	    headcl = mb_char2len(headc);
+		char_u	    *b;
+		hash_T	    hash;
+		hashitem_T  *hi;
+
+		b = alloc((unsigned)(cl + headcl + 2));
+		if (b == NULL)
+		    return;
+		mb_char2bytes(c, b);
+		b[cl] = NUL;
+		mb_char2bytes(headc, b + cl + 1);
+		b[cl + 1 + headcl] = NUL;
+		hash = hash_hash(b);
+		hi = hash_lookup(&lp->sl_map_hash, b, hash);
+		if (HASHITEM_EMPTY(hi))
+		    hash_add_item(&lp->sl_map_hash, hi, b, hash);
+		else
+		{
+		    /* This should have been checked when generating the .spl
+		     * file. */
+		    EMSG(_("E783: duplicate char in MAP entry"));
+		    vim_free(b);
+		}
+	    }
+	    else
+#endif
+		lp->sl_map_array[c] = headc;
+	}
+    }
+}
+
+
+#endif  /* FEAT_SPELL */