Adding upstream version 2:9.1.0016.upstream/2%9.1.0016

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 4512 insertions, 0 deletions

diff --git a/src/spell.c b/src/spell.c
new file mode 100644
index 0000000..da8ece0
--- /dev/null
+++ b/src/spell.c
@@ -0,0 +1,4512 @@
+/* vi:set ts=8 sts=4 sw=4 noet:
+ *
+ * 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.
+ */
+
+/*
+ * spell.c: code for spell checking
+ *
+ * See spellfile.c for the Vim spell file format.
+ *
+ * The spell checking mechanism uses a tree (aka trie).  Each node in the tree
+ * has a list of bytes that can appear (siblings).  For each byte there is a
+ * pointer to the node with the byte that follows in the word (child).
+ *
+ * A NUL byte is used where the word may end.  The bytes are sorted, so that
+ * binary searching can be used and the NUL bytes are at the start.  The
+ * number of possible bytes is stored before the list of bytes.
+ *
+ * The tree uses two arrays: "byts" stores the characters, "idxs" stores
+ * either the next index or flags.  The tree starts at index 0.  For example,
+ * to lookup "vi" this sequence is followed:
+ *	i = 0
+ *	len = byts[i]
+ *	n = where "v" appears in byts[i + 1] to byts[i + len]
+ *	i = idxs[n]
+ *	len = byts[i]
+ *	n = where "i" appears in byts[i + 1] to byts[i + len]
+ *	i = idxs[n]
+ *	len = byts[i]
+ *	find that byts[i + 1] is 0, idxs[i + 1] has flags for "vi".
+ *
+ * There are two word trees: one with case-folded words and one with words in
+ * original case.  The second one is only used for keep-case words and is
+ * usually small.
+ *
+ * There is one additional tree for when not all prefixes are applied when
+ * generating the .spl file.  This tree stores all the possible prefixes, as
+ * if they were words.  At each word (prefix) end the prefix nr is stored, the
+ * following word must support this prefix nr.  And the condition nr is
+ * stored, used to lookup the condition that the word must match with.
+ *
+ * Thanks to Olaf Seibert for providing an example implementation of this tree
+ * and the compression mechanism.
+ * LZ trie ideas:
+ *	http://www.irb.hr/hr/home/ristov/papers/RistovLZtrieRevision1.pdf
+ * More papers: http://www-igm.univ-mlv.fr/~laporte/publi_en.html
+ *
+ * Matching involves checking the caps type: Onecap ALLCAP KeepCap.
+ *
+ * Why doesn't Vim use aspell/ispell/myspell/etc.?
+ * See ":help develop-spell".
+ */
+
+#define IN_SPELL_C
+#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
+
+#define REGION_ALL 0xff		// word valid in all regions
+
+// Result values.  Lower number is accepted over higher one.
+#define SP_BANNED	(-1)
+#define SP_OK		0
+#define SP_RARE		1
+#define SP_LOCAL	2
+#define SP_BAD		3
+
+/*
+ * Structure to store info for word matching.
+ */
+typedef struct matchinf_S
+{
+    langp_T	*mi_lp;			// info for language and region
+
+    // pointers to original text to be checked
+    char_u	*mi_word;		// start of word being checked
+    char_u	*mi_end;		// end of matching word so far
+    char_u	*mi_fend;		// next char to be added to mi_fword
+    char_u	*mi_cend;		// char after what was used for
+					// mi_capflags
+
+    // case-folded text
+    char_u	mi_fword[MAXWLEN + 1];	// mi_word case-folded
+    int		mi_fwordlen;		// nr of valid bytes in mi_fword
+
+    // for when checking word after a prefix
+    int		mi_prefarridx;		// index in sl_pidxs with list of
+					// affixID/condition
+    int		mi_prefcnt;		// number of entries at mi_prefarridx
+    int		mi_prefixlen;		// byte length of prefix
+    int		mi_cprefixlen;		// byte length of prefix in original
+					// case
+
+    // for when checking a compound word
+    int		mi_compoff;		// start of following word offset
+    char_u	mi_compflags[MAXWLEN];	// flags for compound words used
+    int		mi_complen;		// nr of compound words used
+    int		mi_compextra;		// nr of COMPOUNDROOT words
+
+    // others
+    int		mi_result;		// result so far: SP_BAD, SP_OK, etc.
+    int		mi_capflags;		// WF_ONECAP WF_ALLCAP WF_KEEPCAP
+    win_T	*mi_win;		// buffer being checked
+
+    // for NOBREAK
+    int		mi_result2;		// "mi_result" without following word
+    char_u	*mi_end2;		// "mi_end" without following word
+} matchinf_T;
+
+
+static int spell_mb_isword_class(int cl, win_T *wp);
+
+// mode values for find_word
+#define FIND_FOLDWORD	    0	// find word case-folded
+#define FIND_KEEPWORD	    1	// find keep-case word
+#define FIND_PREFIX	    2	// find word after prefix
+#define FIND_COMPOUND	    3	// find case-folded compound word
+#define FIND_KEEPCOMPOUND   4	// find keep-case compound word
+
+// type values for get_char_type
+#define CHAR_OTHER	0
+#define CHAR_UPPER	1
+#define CHAR_DIGIT	2
+
+static void find_word(matchinf_T *mip, int mode);
+static void find_prefix(matchinf_T *mip, int mode);
+static int fold_more(matchinf_T *mip);
+static void spell_load_cb(char_u *fname, void *cookie);
+static int count_syllables(slang_T *slang, char_u *word);
+static void clear_midword(win_T *buf);
+static void use_midword(slang_T *lp, win_T *buf);
+static int find_region(char_u *rp, char_u *region);
+static void spell_soundfold_sofo(slang_T *slang, char_u *inword, char_u *res);
+static void spell_soundfold_sal(slang_T *slang, char_u *inword, char_u *res);
+static void spell_soundfold_wsal(slang_T *slang, char_u *inword, char_u *res);
+static void dump_word(slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T lnum);
+static linenr_T dump_prefixes(slang_T *slang, char_u *word, char_u *pat, int *dir, int round, int flags, linenr_T startlnum);
+static char_u *advance_camelcase_word(char_u *p, win_T *wp, int *is_camel_case);
+
+/*
+ * Main spell-checking function.
+ * "ptr" points to a character that could be the start of a word.
+ * "*attrp" is set to the highlight index for a badly spelled word.  For a
+ * non-word or when it's OK it remains unchanged.
+ * This must only be called when 'spelllang' is not empty.
+ *
+ * "capcol" is used to check for a Capitalised word after the end of a
+ * sentence.  If it's zero then perform the check.  Return the column where to
+ * check next, or -1 when no sentence end was found.  If it's NULL then don't
+ * worry.
+ *
+ * Returns the length of the word in bytes, also when it's OK, so that the
+ * caller can skip over the word.
+ */
+    int
+spell_check(
+    win_T	*wp,		// current window
+    char_u	*ptr,
+    hlf_T	*attrp,
+    int		*capcol,	// column to check for Capital
+    int		docount)	// count good words
+{
+    matchinf_T	mi;		// Most things are put in "mi" so that it can
+				// be passed to functions quickly.
+    int		nrlen = 0;	// found a number first
+    int		c;
+    int		wrongcaplen = 0;
+    int		lpi;
+    int		count_word = docount;
+    int		use_camel_case = *wp->w_s->b_p_spo != NUL;
+    int		is_camel_case = FALSE;
+
+    // A word never starts at a space or a control character.  Return quickly
+    // then, skipping over the character.
+    if (*ptr <= ' ')
+	return 1;
+
+    // Return here when loading language files failed.
+    if (wp->w_s->b_langp.ga_len == 0)
+	return 1;
+
+    CLEAR_FIELD(mi);
+
+    // A number is always OK.  Also skip hexadecimal numbers 0xFF99 and
+    // 0X99FF.  But always do check spelling to find "3GPP" and "11
+    // julifeest".
+    if (*ptr >= '0' && *ptr <= '9')
+    {
+	if (*ptr == '0' && (ptr[1] == 'b' || ptr[1] == 'B'))
+	    mi.mi_end = skipbin(ptr + 2);
+	else if (*ptr == '0' && (ptr[1] == 'x' || ptr[1] == 'X'))
+	    mi.mi_end = skiphex(ptr + 2);
+	else
+	    mi.mi_end = skipdigits(ptr);
+	nrlen = (int)(mi.mi_end - ptr);
+    }
+
+    // Find the normal end of the word (until the next non-word character).
+    mi.mi_word = ptr;
+    mi.mi_fend = ptr;
+    if (spell_iswordp(mi.mi_fend, wp))
+    {
+	if (use_camel_case)
+	    mi.mi_fend = advance_camelcase_word(ptr, wp, &is_camel_case);
+	else
+	{
+	    do
+	    {
+		MB_PTR_ADV(mi.mi_fend);
+	    } while (*mi.mi_fend != NUL && spell_iswordp(mi.mi_fend, wp));
+	}
+
+	if (capcol != NULL && *capcol == 0 && wp->w_s->b_cap_prog != NULL)
+	{
+	    // Check word starting with capital letter.
+	    c = PTR2CHAR(ptr);
+	    if (!SPELL_ISUPPER(c))
+		wrongcaplen = (int)(mi.mi_fend - ptr);
+	}
+    }
+    if (capcol != NULL)
+	*capcol = -1;
+
+    // We always use the characters up to the next non-word character,
+    // also for bad words.
+    mi.mi_end = mi.mi_fend;
+
+    // Check caps type later.
+    mi.mi_capflags = 0;
+    mi.mi_cend = NULL;
+    mi.mi_win = wp;
+
+    // case-fold the word with one non-word character, so that we can check
+    // for the word end.
+    if (*mi.mi_fend != NUL)
+	MB_PTR_ADV(mi.mi_fend);
+
+    (void)spell_casefold(wp, ptr, (int)(mi.mi_fend - ptr), mi.mi_fword,
+							     MAXWLEN + 1);
+    mi.mi_fwordlen = (int)STRLEN(mi.mi_fword);
+
+    if (is_camel_case && mi.mi_fwordlen > 0)
+	// Introduce a fake word end space into the folded word.
+	mi.mi_fword[mi.mi_fwordlen - 1] = ' ';
+
+    // The word is bad unless we recognize it.
+    mi.mi_result = SP_BAD;
+    mi.mi_result2 = SP_BAD;
+
+    /*
+     * Loop over the languages specified in 'spelllang'.
+     * We check them all, because a word may be matched longer in another
+     * language.
+     */
+    for (lpi = 0; lpi < wp->w_s->b_langp.ga_len; ++lpi)
+    {
+	mi.mi_lp = LANGP_ENTRY(wp->w_s->b_langp, lpi);
+
+	// If reloading fails the language is still in the list but everything
+	// has been cleared.
+	if (mi.mi_lp->lp_slang->sl_fidxs == NULL)
+	    continue;
+
+	// Check for a matching word in case-folded words.
+	find_word(&mi, FIND_FOLDWORD);
+
+	// Check for a matching word in keep-case words.
+	find_word(&mi, FIND_KEEPWORD);
+
+	// Check for matching prefixes.
+	find_prefix(&mi, FIND_FOLDWORD);
+
+	// For a NOBREAK language, may want to use a word without a following
+	// word as a backup.
+	if (mi.mi_lp->lp_slang->sl_nobreak && mi.mi_result == SP_BAD
+						   && mi.mi_result2 != SP_BAD)
+	{
+	    mi.mi_result = mi.mi_result2;
+	    mi.mi_end = mi.mi_end2;
+	}
+
+	// Count the word in the first language where it's found to be OK.
+	if (count_word && mi.mi_result == SP_OK)
+	{
+	    count_common_word(mi.mi_lp->lp_slang, ptr,
+						   (int)(mi.mi_end - ptr), 1);
+	    count_word = FALSE;
+	}
+    }
+
+    if (mi.mi_result != SP_OK)
+    {
+	// If we found a number skip over it.  Allows for "42nd".  Do flag
+	// rare and local words, e.g., "3GPP".
+	if (nrlen > 0)
+	{
+	    if (mi.mi_result == SP_BAD || mi.mi_result == SP_BANNED)
+		return nrlen;
+	}
+
+	// When we are at a non-word character there is no error, just
+	// skip over the character (try looking for a word after it).
+	else if (!spell_iswordp_nmw(ptr, wp))
+	{
+	    if (capcol != NULL && wp->w_s->b_cap_prog != NULL)
+	    {
+		regmatch_T	regmatch;
+		int		r;
+
+		// Check for end of sentence.
+		regmatch.regprog = wp->w_s->b_cap_prog;
+		regmatch.rm_ic = FALSE;
+		r = vim_regexec(&regmatch, ptr, 0);
+		wp->w_s->b_cap_prog = regmatch.regprog;
+		if (r)
+		    *capcol = (int)(regmatch.endp[0] - ptr);
+	    }
+
+	    if (has_mbyte)
+		return (*mb_ptr2len)(ptr);
+	    return 1;
+	}
+	else if (mi.mi_end == ptr)
+	    // Always include at least one character.  Required for when there
+	    // is a mixup in "midword".
+	    MB_PTR_ADV(mi.mi_end);
+	else if (mi.mi_result == SP_BAD
+		&& LANGP_ENTRY(wp->w_s->b_langp, 0)->lp_slang->sl_nobreak)
+	{
+	    char_u	*p, *fp;
+	    int		save_result = mi.mi_result;
+
+	    // First language in 'spelllang' is NOBREAK.  Find first position
+	    // at which any word would be valid.
+	    mi.mi_lp = LANGP_ENTRY(wp->w_s->b_langp, 0);
+	    if (mi.mi_lp->lp_slang->sl_fidxs != NULL)
+	    {
+		p = mi.mi_word;
+		fp = mi.mi_fword;
+		for (;;)
+		{
+		    MB_PTR_ADV(p);
+		    MB_PTR_ADV(fp);
+		    if (p >= mi.mi_end)
+			break;
+		    mi.mi_compoff = (int)(fp - mi.mi_fword);
+		    find_word(&mi, FIND_COMPOUND);
+		    if (mi.mi_result != SP_BAD)
+		    {
+			mi.mi_end = p;
+			break;
+		    }
+		}
+		mi.mi_result = save_result;
+	    }
+	}
+
+	if (mi.mi_result == SP_BAD || mi.mi_result == SP_BANNED)
+	    *attrp = HLF_SPB;
+	else if (mi.mi_result == SP_RARE)
+	    *attrp = HLF_SPR;
+	else
+	    *attrp = HLF_SPL;
+    }
+
+    if (wrongcaplen > 0 && (mi.mi_result == SP_OK || mi.mi_result == SP_RARE))
+    {
+	// Report SpellCap only when the word isn't badly spelled.
+	*attrp = HLF_SPC;
+	return wrongcaplen;
+    }
+
+    return (int)(mi.mi_end - ptr);
+}
+
+/*
+ * Determine the type of character 'c'.
+ */
+    static int
+get_char_type(int c)
+{
+    if (VIM_ISDIGIT(c))
+	return CHAR_DIGIT;
+    if (SPELL_ISUPPER(c))
+	return CHAR_UPPER;
+    return CHAR_OTHER;
+}
+
+/*
+ * Returns a pointer to the end of the word starting at "str".
+ * Supports camelCase words.
+ */
+    static char_u *
+advance_camelcase_word(char_u *str, win_T *wp, int *is_camel_case)
+{
+    int last_type, last_last_type, this_type;
+    int c;
+    char_u *end = str;
+
+    *is_camel_case = FALSE;
+
+    if (*str == NUL)
+	return str;
+
+    c = PTR2CHAR(end);
+    MB_PTR_ADV(end);
+    // We need at most the types of the type of the last two chars.
+    last_last_type = -1;
+    last_type = get_char_type(c);
+
+    while (*end != NUL && spell_iswordp(end, wp))
+    {
+	c = PTR2CHAR(end);
+	this_type = get_char_type(c);
+
+	if (last_last_type == CHAR_UPPER && last_type == CHAR_UPPER
+		&& this_type == CHAR_OTHER)
+	{
+	    // Handle the following cases:
+	    // UpperUpperLower
+	    *is_camel_case = TRUE;
+	    // Back up by one char.
+	    MB_PTR_BACK(str, end);
+	    break;
+	}
+	else if ((this_type == CHAR_UPPER && last_type == CHAR_OTHER)
+		|| (this_type != last_type
+		    && (this_type == CHAR_DIGIT || last_type == CHAR_DIGIT)))
+	{
+	    // Handle the following cases:
+	    // LowerUpper LowerDigit UpperDigit DigitUpper DigitLower
+	    *is_camel_case = TRUE;
+	    break;
+	}
+
+	last_last_type = last_type;
+	last_type = this_type;
+
+	MB_PTR_ADV(end);
+    }
+
+    return end;
+}
+
+/*
+ * Check if the word at "mip->mi_word" is in the tree.
+ * When "mode" is FIND_FOLDWORD check in fold-case word tree.
+ * When "mode" is FIND_KEEPWORD check in keep-case word tree.
+ * When "mode" is FIND_PREFIX check for word after prefix in fold-case word
+ * tree.
+ *
+ * For a match mip->mi_result is updated.
+ */
+    static void
+find_word(matchinf_T *mip, int mode)
+{
+    idx_T	arridx = 0;
+    int		endlen[MAXWLEN];    // length at possible word endings
+    idx_T	endidx[MAXWLEN];    // possible word endings
+    int		endidxcnt = 0;
+    int		len;
+    int		wlen = 0;
+    int		flen;
+    int		c;
+    char_u	*ptr;
+    idx_T	lo, hi, m;
+    char_u	*s;
+    char_u	*p;
+    int		res = SP_BAD;
+    slang_T	*slang = mip->mi_lp->lp_slang;
+    unsigned	flags;
+    char_u	*byts;
+    idx_T	*idxs;
+    int		word_ends;
+    int		prefix_found;
+    int		nobreak_result;
+
+    if (mode == FIND_KEEPWORD || mode == FIND_KEEPCOMPOUND)
+    {
+	// Check for word with matching case in keep-case tree.
+	ptr = mip->mi_word;
+	flen = 9999;		    // no case folding, always enough bytes
+	byts = slang->sl_kbyts;
+	idxs = slang->sl_kidxs;
+
+	if (mode == FIND_KEEPCOMPOUND)
+	    // Skip over the previously found word(s).
+	    wlen += mip->mi_compoff;
+    }
+    else
+    {
+	// Check for case-folded in case-folded tree.
+	ptr = mip->mi_fword;
+	flen = mip->mi_fwordlen;    // available case-folded bytes
+	byts = slang->sl_fbyts;
+	idxs = slang->sl_fidxs;
+
+	if (mode == FIND_PREFIX)
+	{
+	    // Skip over the prefix.
+	    wlen = mip->mi_prefixlen;
+	    flen -= mip->mi_prefixlen;
+	}
+	else if (mode == FIND_COMPOUND)
+	{
+	    // Skip over the previously found word(s).
+	    wlen = mip->mi_compoff;
+	    flen -= mip->mi_compoff;
+	}
+
+    }
+
+    if (byts == NULL)
+	return;			// array is empty
+
+    /*
+     * Repeat advancing in the tree until:
+     * - there is a byte that doesn't match,
+     * - we reach the end of the tree,
+     * - or we reach the end of the line.
+     */
+    for (;;)
+    {
+	if (flen <= 0 && *mip->mi_fend != NUL)
+	    flen = fold_more(mip);
+
+	len = byts[arridx++];
+
+	// If the first possible byte is a zero the word could end here.
+	// Remember this index, we first check for the longest word.
+	if (byts[arridx] == 0)
+	{
+	    if (endidxcnt == MAXWLEN)
+	    {
+		// Must be a corrupted spell file.
+		emsg(_(e_format_error_in_spell_file));
+		return;
+	    }
+	    endlen[endidxcnt] = wlen;
+	    endidx[endidxcnt++] = arridx++;
+	    --len;
+
+	    // Skip over the zeros, there can be several flag/region
+	    // combinations.
+	    while (len > 0 && byts[arridx] == 0)
+	    {
+		++arridx;
+		--len;
+	    }
+	    if (len == 0)
+		break;	    // no children, word must end here
+	}
+
+	// Stop looking at end of the line.
+	if (ptr[wlen] == NUL)
+	    break;
+
+	// Perform a binary search in the list of accepted bytes.
+	c = ptr[wlen];
+	if (c == TAB)	    // <Tab> is handled like <Space>
+	    c = ' ';
+	lo = arridx;
+	hi = arridx + len - 1;
+	while (lo < hi)
+	{
+	    m = (lo + hi) / 2;
+	    if (byts[m] > c)
+		hi = m - 1;
+	    else if (byts[m] < c)
+		lo = m + 1;
+	    else
+	    {
+		lo = hi = m;
+		break;
+	    }
+	}
+
+	// Stop if there is no matching byte.
+	if (hi < lo || byts[lo] != c)
+	    break;
+
+	// Continue at the child (if there is one).
+	arridx = idxs[lo];
+	++wlen;
+	--flen;
+
+	// One space in the good word may stand for several spaces in the
+	// checked word.
+	if (c == ' ')
+	{
+	    for (;;)
+	    {
+		if (flen <= 0 && *mip->mi_fend != NUL)
+		    flen = fold_more(mip);
+		if (ptr[wlen] != ' ' && ptr[wlen] != TAB)
+		    break;
+		++wlen;
+		--flen;
+	    }
+	}
+    }
+
+    /*
+     * Verify that one of the possible endings is valid.  Try the longest
+     * first.
+     */
+    while (endidxcnt > 0)
+    {
+	--endidxcnt;
+	arridx = endidx[endidxcnt];
+	wlen = endlen[endidxcnt];
+
+	if ((*mb_head_off)(ptr, ptr + wlen) > 0)
+	    continue;	    // not at first byte of character
+	if (spell_iswordp(ptr + wlen, mip->mi_win))
+	{
+	    if (slang->sl_compprog == NULL && !slang->sl_nobreak)
+		continue;	    // next char is a word character
+	    word_ends = FALSE;
+	}
+	else
+	    word_ends = TRUE;
+	// The prefix flag is before compound flags.  Once a valid prefix flag
+	// has been found we try compound flags.
+	prefix_found = FALSE;
+
+	if (mode != FIND_KEEPWORD && has_mbyte)
+	{
+	    // Compute byte length in original word, length may change
+	    // when folding case.  This can be slow, take a shortcut when the
+	    // case-folded word is equal to the keep-case word.
+	    p = mip->mi_word;
+	    if (STRNCMP(ptr, p, wlen) != 0)
+	    {
+		for (s = ptr; s < ptr + wlen; MB_PTR_ADV(s))
+		    MB_PTR_ADV(p);
+		wlen = (int)(p - mip->mi_word);
+	    }
+	}
+
+	// Check flags and region.  For FIND_PREFIX check the condition and
+	// prefix ID.
+	// Repeat this if there are more flags/region alternatives until there
+	// is a match.
+	res = SP_BAD;
+	for (len = byts[arridx - 1]; len > 0 && byts[arridx] == 0;
+							      --len, ++arridx)
+	{
+	    flags = idxs[arridx];
+
+	    // For the fold-case tree check that the case of the checked word
+	    // matches with what the word in the tree requires.
+	    // For keep-case tree the case is always right.  For prefixes we
+	    // don't bother to check.
+	    if (mode == FIND_FOLDWORD)
+	    {
+		if (mip->mi_cend != mip->mi_word + wlen)
+		{
+		    // mi_capflags was set for a different word length, need
+		    // to do it again.
+		    mip->mi_cend = mip->mi_word + wlen;
+		    mip->mi_capflags = captype(mip->mi_word, mip->mi_cend);
+		}
+
+		if (mip->mi_capflags == WF_KEEPCAP
+				|| !spell_valid_case(mip->mi_capflags, flags))
+		    continue;
+	    }
+
+	    // When mode is FIND_PREFIX the word must support the prefix:
+	    // check the prefix ID and the condition.  Do that for the list at
+	    // mip->mi_prefarridx that find_prefix() filled.
+	    else if (mode == FIND_PREFIX && !prefix_found)
+	    {
+		c = valid_word_prefix(mip->mi_prefcnt, mip->mi_prefarridx,
+				    flags,
+				    mip->mi_word + mip->mi_cprefixlen, slang,
+				    FALSE);
+		if (c == 0)
+		    continue;
+
+		// Use the WF_RARE flag for a rare prefix.
+		if (c & WF_RAREPFX)
+		    flags |= WF_RARE;
+		prefix_found = TRUE;
+	    }
+
+	    if (slang->sl_nobreak)
+	    {
+		if ((mode == FIND_COMPOUND || mode == FIND_KEEPCOMPOUND)
+			&& (flags & WF_BANNED) == 0)
+		{
+		    // NOBREAK: found a valid following word.  That's all we
+		    // need to know, so return.
+		    mip->mi_result = SP_OK;
+		    break;
+		}
+	    }
+
+	    else if ((mode == FIND_COMPOUND || mode == FIND_KEEPCOMPOUND
+								|| !word_ends))
+	    {
+		// If there is no compound flag or the word is shorter than
+		// COMPOUNDMIN reject it quickly.
+		// Makes you wonder why someone puts a compound flag on a word
+		// that's too short...  Myspell compatibility requires this
+		// anyway.
+		if (((unsigned)flags >> 24) == 0
+			     || wlen - mip->mi_compoff < slang->sl_compminlen)
+		    continue;
+		// For multi-byte chars check character length against
+		// COMPOUNDMIN.
+		if (has_mbyte
+			&& slang->sl_compminlen > 0
+			&& mb_charlen_len(mip->mi_word + mip->mi_compoff,
+				wlen - mip->mi_compoff) < slang->sl_compminlen)
+			continue;
+
+		// Limit the number of compound words to COMPOUNDWORDMAX if no
+		// maximum for syllables is specified.
+		if (!word_ends && mip->mi_complen + mip->mi_compextra + 2
+							   > slang->sl_compmax
+					   && slang->sl_compsylmax == MAXWLEN)
+		    continue;
+
+		// Don't allow compounding on a side where an affix was added,
+		// unless COMPOUNDPERMITFLAG was used.
+		if (mip->mi_complen > 0 && (flags & WF_NOCOMPBEF))
+		    continue;
+		if (!word_ends && (flags & WF_NOCOMPAFT))
+		    continue;
+
+		// Quickly check if compounding is possible with this flag.
+		if (!byte_in_str(mip->mi_complen == 0
+					? slang->sl_compstartflags
+					: slang->sl_compallflags,
+					    ((unsigned)flags >> 24)))
+		    continue;
+
+		// If there is a match with a CHECKCOMPOUNDPATTERN rule
+		// discard the compound word.
+		if (match_checkcompoundpattern(ptr, wlen, &slang->sl_comppat))
+		    continue;
+
+		if (mode == FIND_COMPOUND)
+		{
+		    int	    capflags;
+
+		    // Need to check the caps type of the appended compound
+		    // word.
+		    if (has_mbyte && STRNCMP(ptr, mip->mi_word,
+							mip->mi_compoff) != 0)
+		    {
+			// case folding may have changed the length
+			p = mip->mi_word;
+			for (s = ptr; s < ptr + mip->mi_compoff; MB_PTR_ADV(s))
+			    MB_PTR_ADV(p);
+		    }
+		    else
+			p = mip->mi_word + mip->mi_compoff;
+		    capflags = captype(p, mip->mi_word + wlen);
+		    if (capflags == WF_KEEPCAP || (capflags == WF_ALLCAP
+						 && (flags & WF_FIXCAP) != 0))
+			continue;
+
+		    if (capflags != WF_ALLCAP)
+		    {
+			// When the character before the word is a word
+			// character we do not accept a Onecap word.  We do
+			// accept a no-caps word, even when the dictionary
+			// word specifies ONECAP.
+			MB_PTR_BACK(mip->mi_word, p);
+			if (spell_iswordp_nmw(p, mip->mi_win)
+				? capflags == WF_ONECAP
+				: (flags & WF_ONECAP) != 0
+						     && capflags != WF_ONECAP)
+			    continue;
+		    }
+		}
+
+		// If the word ends the sequence of compound flags of the
+		// words must match with one of the COMPOUNDRULE items and
+		// the number of syllables must not be too large.
+		mip->mi_compflags[mip->mi_complen] = ((unsigned)flags >> 24);
+		mip->mi_compflags[mip->mi_complen + 1] = NUL;
+		if (word_ends)
+		{
+		    char_u	fword[MAXWLEN];
+
+		    if (slang->sl_compsylmax < MAXWLEN)
+		    {
+			// "fword" is only needed for checking syllables.
+			if (ptr == mip->mi_word)
+			    (void)spell_casefold(mip->mi_win,
+						    ptr, wlen, fword, MAXWLEN);
+			else
+			    vim_strncpy(fword, ptr, endlen[endidxcnt]);
+		    }
+		    if (!can_compound(slang, fword, mip->mi_compflags))
+			continue;
+		}
+		else if (slang->sl_comprules != NULL
+			     && !match_compoundrule(slang, mip->mi_compflags))
+		    // The compound flags collected so far do not match any
+		    // COMPOUNDRULE, discard the compounded word.
+		    continue;
+	    }
+
+	    // Check NEEDCOMPOUND: can't use word without compounding.
+	    else if (flags & WF_NEEDCOMP)
+		continue;
+
+	    nobreak_result = SP_OK;
+
+	    if (!word_ends)
+	    {
+		int	save_result = mip->mi_result;
+		char_u	*save_end = mip->mi_end;
+		langp_T	*save_lp = mip->mi_lp;
+		int	lpi;
+
+		// Check that a valid word follows.  If there is one and we
+		// are compounding, it will set "mi_result", thus we are
+		// always finished here.  For NOBREAK we only check that a
+		// valid word follows.
+		// Recursive!
+		if (slang->sl_nobreak)
+		    mip->mi_result = SP_BAD;
+
+		// Find following word in case-folded tree.
+		mip->mi_compoff = endlen[endidxcnt];
+		if (has_mbyte && mode == FIND_KEEPWORD)
+		{
+		    // Compute byte length in case-folded word from "wlen":
+		    // byte length in keep-case word.  Length may change when
+		    // folding case.  This can be slow, take a shortcut when
+		    // the case-folded word is equal to the keep-case word.
+		    p = mip->mi_fword;
+		    if (STRNCMP(ptr, p, wlen) != 0)
+		    {
+			for (s = ptr; s < ptr + wlen; MB_PTR_ADV(s))
+			    MB_PTR_ADV(p);
+			mip->mi_compoff = (int)(p - mip->mi_fword);
+		    }
+		}
+#if 0 // Disabled, see below
+		c = mip->mi_compoff;
+#endif
+		++mip->mi_complen;
+		if (flags & WF_COMPROOT)
+		    ++mip->mi_compextra;
+
+		// For NOBREAK we need to try all NOBREAK languages, at least
+		// to find the ".add" file(s).
+		for (lpi = 0; lpi < mip->mi_win->w_s->b_langp.ga_len; ++lpi)
+		{
+		    if (slang->sl_nobreak)
+		    {
+			mip->mi_lp = LANGP_ENTRY(mip->mi_win->w_s->b_langp, lpi);
+			if (mip->mi_lp->lp_slang->sl_fidxs == NULL
+					 || !mip->mi_lp->lp_slang->sl_nobreak)
+			    continue;
+		    }
+
+		    find_word(mip, FIND_COMPOUND);
+
+		    // When NOBREAK any word that matches is OK.  Otherwise we
+		    // need to find the longest match, thus try with keep-case
+		    // and prefix too.
+		    if (!slang->sl_nobreak || mip->mi_result == SP_BAD)
+		    {
+			// Find following word in keep-case tree.
+			mip->mi_compoff = wlen;
+			find_word(mip, FIND_KEEPCOMPOUND);
+
+#if 0	    // Disabled, a prefix must not appear halfway a compound word,
+	    // unless the COMPOUNDPERMITFLAG is used and then it can't be a
+	    // postponed prefix.
+			if (!slang->sl_nobreak || mip->mi_result == SP_BAD)
+			{
+			    // Check for following word with prefix.
+			    mip->mi_compoff = c;
+			    find_prefix(mip, FIND_COMPOUND);
+			}
+#endif
+		    }
+
+		    if (!slang->sl_nobreak)
+			break;
+		}
+		--mip->mi_complen;
+		if (flags & WF_COMPROOT)
+		    --mip->mi_compextra;
+		mip->mi_lp = save_lp;
+
+		if (slang->sl_nobreak)
+		{
+		    nobreak_result = mip->mi_result;
+		    mip->mi_result = save_result;
+		    mip->mi_end = save_end;
+		}
+		else
+		{
+		    if (mip->mi_result == SP_OK)
+			break;
+		    continue;
+		}
+	    }
+
+	    if (flags & WF_BANNED)
+		res = SP_BANNED;
+	    else if (flags & WF_REGION)
+	    {
+		// Check region.
+		if ((mip->mi_lp->lp_region & (flags >> 16)) != 0)
+		    res = SP_OK;
+		else
+		    res = SP_LOCAL;
+	    }
+	    else if (flags & WF_RARE)
+		res = SP_RARE;
+	    else
+		res = SP_OK;
+
+	    // Always use the longest match and the best result.  For NOBREAK
+	    // we separately keep the longest match without a following good
+	    // word as a fall-back.
+	    if (nobreak_result == SP_BAD)
+	    {
+		if (mip->mi_result2 > res)
+		{
+		    mip->mi_result2 = res;
+		    mip->mi_end2 = mip->mi_word + wlen;
+		}
+		else if (mip->mi_result2 == res
+					&& mip->mi_end2 < mip->mi_word + wlen)
+		    mip->mi_end2 = mip->mi_word + wlen;
+	    }
+	    else if (mip->mi_result > res)
+	    {
+		mip->mi_result = res;
+		mip->mi_end = mip->mi_word + wlen;
+	    }
+	    else if (mip->mi_result == res && mip->mi_end < mip->mi_word + wlen)
+		mip->mi_end = mip->mi_word + wlen;
+
+	    if (mip->mi_result == SP_OK)
+		break;
+	}
+
+	if (mip->mi_result == SP_OK)
+	    break;
+    }
+}
+
+/*
+ * Return TRUE if there is a match between the word ptr[wlen] and
+ * CHECKCOMPOUNDPATTERN rules, assuming that we will concatenate with another
+ * word.
+ * A match means that the first part of CHECKCOMPOUNDPATTERN matches at the
+ * end of ptr[wlen] and the second part matches after it.
+ */
+    int
+match_checkcompoundpattern(
+    char_u	*ptr,
+    int		wlen,
+    garray_T	*gap)  // &sl_comppat
+{
+    int		i;
+    char_u	*p;
+    int		len;
+
+    for (i = 0; i + 1 < gap->ga_len; i += 2)
+    {
+	p = ((char_u **)gap->ga_data)[i + 1];
+	if (STRNCMP(ptr + wlen, p, STRLEN(p)) == 0)
+	{
+	    // Second part matches at start of following compound word, now
+	    // check if first part matches at end of previous word.
+	    p = ((char_u **)gap->ga_data)[i];
+	    len = (int)STRLEN(p);
+	    if (len <= wlen && STRNCMP(ptr + wlen - len, p, len) == 0)
+		return TRUE;
+	}
+    }
+    return FALSE;
+}
+
+/*
+ * Return TRUE if "flags" is a valid sequence of compound flags and "word"
+ * does not have too many syllables.
+ */
+    int
+can_compound(slang_T *slang, char_u *word, char_u *flags)
+{
+    char_u	uflags[MAXWLEN * 2];
+    int		i;
+    char_u	*p;
+
+    if (slang->sl_compprog == NULL)
+	return FALSE;
+    if (enc_utf8)
+    {
+	// Need to convert the single byte flags to utf8 characters.
+	p = uflags;
+	for (i = 0; flags[i] != NUL; ++i)
+	    p += utf_char2bytes(flags[i], p);
+	*p = NUL;
+	p = uflags;
+    }
+    else
+	p = flags;
+    if (!vim_regexec_prog(&slang->sl_compprog, FALSE, p, 0))
+	return FALSE;
+
+    // Count the number of syllables.  This may be slow, do it last.  If there
+    // are too many syllables AND the number of compound words is above
+    // COMPOUNDWORDMAX then compounding is not allowed.
+    if (slang->sl_compsylmax < MAXWLEN
+		       && count_syllables(slang, word) > slang->sl_compsylmax)
+	return (int)STRLEN(flags) < slang->sl_compmax;
+    return TRUE;
+}
+
+/*
+ * Return TRUE if the compound flags in compflags[] match the start of any
+ * compound rule.  This is used to stop trying a compound if the flags
+ * collected so far can't possibly match any compound rule.
+ * Caller must check that slang->sl_comprules is not NULL.
+ */
+    int
+match_compoundrule(slang_T *slang, char_u *compflags)
+{
+    char_u	*p;
+    int		i;
+    int		c;
+
+    // loop over all the COMPOUNDRULE entries
+    for (p = slang->sl_comprules; *p != NUL; ++p)
+    {
+	// loop over the flags in the compound word we have made, match
+	// them against the current rule entry
+	for (i = 0; ; ++i)
+	{
+	    c = compflags[i];
+	    if (c == NUL)
+		// found a rule that matches for the flags we have so far
+		return TRUE;
+	    if (*p == '/' || *p == NUL)
+		break;  // end of rule, it's too short
+	    if (*p == '[')
+	    {
+		int match = FALSE;
+
+		// compare against all the flags in []
+		++p;
+		while (*p != ']' && *p != NUL)
+		    if (*p++ == c)
+			match = TRUE;
+		if (!match)
+		    break;  // none matches
+	    }
+	    else if (*p != c)
+		break;  // flag of word doesn't match flag in pattern
+	    ++p;
+	}
+
+	// Skip to the next "/", where the next pattern starts.
+	p = vim_strchr(p, '/');
+	if (p == NULL)
+	    break;
+    }
+
+    // Checked all the rules and none of them match the flags, so there
+    // can't possibly be a compound starting with these flags.
+    return FALSE;
+}
+
+/*
+ * Return non-zero if the prefix indicated by "arridx" matches with the prefix
+ * ID in "flags" for the word "word".
+ * The WF_RAREPFX flag is included in the return value for a rare prefix.
+ */
+    int
+valid_word_prefix(
+    int		totprefcnt,	// nr of prefix IDs
+    int		arridx,		// idx in sl_pidxs[]
+    int		flags,
+    char_u	*word,
+    slang_T	*slang,
+    int		cond_req)	// only use prefixes with a condition
+{
+    int		prefcnt;
+    int		pidx;
+    regprog_T	**rp;
+    int		prefid;
+
+    prefid = (unsigned)flags >> 24;
+    for (prefcnt = totprefcnt - 1; prefcnt >= 0; --prefcnt)
+    {
+	pidx = slang->sl_pidxs[arridx + prefcnt];
+
+	// Check the prefix ID.
+	if (prefid != (pidx & 0xff))
+	    continue;
+
+	// Check if the prefix doesn't combine and the word already has a
+	// suffix.
+	if ((flags & WF_HAS_AFF) && (pidx & WF_PFX_NC))
+	    continue;
+
+	// Check the condition, if there is one.  The condition index is
+	// stored in the two bytes above the prefix ID byte.
+	rp = &slang->sl_prefprog[((unsigned)pidx >> 8) & 0xffff];
+	if (*rp != NULL)
+	{
+	    if (!vim_regexec_prog(rp, FALSE, word, 0))
+		continue;
+	}
+	else if (cond_req)
+	    continue;
+
+	// It's a match!  Return the WF_ flags.
+	return pidx;
+    }
+    return 0;
+}
+
+/*
+ * Check if the word at "mip->mi_word" has a matching prefix.
+ * If it does, then check the following word.
+ *
+ * If "mode" is "FIND_COMPOUND" then do the same after another word, find a
+ * prefix in a compound word.
+ *
+ * For a match mip->mi_result is updated.
+ */
+    static void
+find_prefix(matchinf_T *mip, int mode)
+{
+    idx_T	arridx = 0;
+    int		len;
+    int		wlen = 0;
+    int		flen;
+    int		c;
+    char_u	*ptr;
+    idx_T	lo, hi, m;
+    slang_T	*slang = mip->mi_lp->lp_slang;
+    char_u	*byts;
+    idx_T	*idxs;
+
+    byts = slang->sl_pbyts;
+    if (byts == NULL)
+	return;			// array is empty
+
+    // We use the case-folded word here, since prefixes are always
+    // case-folded.
+    ptr = mip->mi_fword;
+    flen = mip->mi_fwordlen;    // available case-folded bytes
+    if (mode == FIND_COMPOUND)
+    {
+	// Skip over the previously found word(s).
+	ptr += mip->mi_compoff;
+	flen -= mip->mi_compoff;
+    }
+    idxs = slang->sl_pidxs;
+
+    /*
+     * Repeat advancing in the tree until:
+     * - there is a byte that doesn't match,
+     * - we reach the end of the tree,
+     * - or we reach the end of the line.
+     */
+    for (;;)
+    {
+	if (flen == 0 && *mip->mi_fend != NUL)
+	    flen = fold_more(mip);
+
+	len = byts[arridx++];
+
+	// If the first possible byte is a zero the prefix could end here.
+	// Check if the following word matches and supports the prefix.
+	if (byts[arridx] == 0)
+	{
+	    // There can be several prefixes with different conditions.  We
+	    // try them all, since we don't know which one will give the
+	    // longest match.  The word is the same each time, pass the list
+	    // of possible prefixes to find_word().
+	    mip->mi_prefarridx = arridx;
+	    mip->mi_prefcnt = len;
+	    while (len > 0 && byts[arridx] == 0)
+	    {
+		++arridx;
+		--len;
+	    }
+	    mip->mi_prefcnt -= len;
+
+	    // Find the word that comes after the prefix.
+	    mip->mi_prefixlen = wlen;
+	    if (mode == FIND_COMPOUND)
+		// Skip over the previously found word(s).
+		mip->mi_prefixlen += mip->mi_compoff;
+
+	    if (has_mbyte)
+	    {
+		// Case-folded length may differ from original length.
+		mip->mi_cprefixlen = nofold_len(mip->mi_fword,
+					     mip->mi_prefixlen, mip->mi_word);
+	    }
+	    else
+		mip->mi_cprefixlen = mip->mi_prefixlen;
+	    find_word(mip, FIND_PREFIX);
+
+
+	    if (len == 0)
+		break;	    // no children, word must end here
+	}
+
+	// Stop looking at end of the line.
+	if (ptr[wlen] == NUL)
+	    break;
+
+	// Perform a binary search in the list of accepted bytes.
+	c = ptr[wlen];
+	lo = arridx;
+	hi = arridx + len - 1;
+	while (lo < hi)
+	{
+	    m = (lo + hi) / 2;
+	    if (byts[m] > c)
+		hi = m - 1;
+	    else if (byts[m] < c)
+		lo = m + 1;
+	    else
+	    {
+		lo = hi = m;
+		break;
+	    }
+	}
+
+	// Stop if there is no matching byte.
+	if (hi < lo || byts[lo] != c)
+	    break;
+
+	// Continue at the child (if there is one).
+	arridx = idxs[lo];
+	++wlen;
+	--flen;
+    }
+}
+
+/*
+ * Need to fold at least one more character.  Do until next non-word character
+ * for efficiency.  Include the non-word character too.
+ * Return the length of the folded chars in bytes.
+ */
+    static int
+fold_more(matchinf_T *mip)
+{
+    int		flen;
+    char_u	*p;
+
+    p = mip->mi_fend;
+    do
+	MB_PTR_ADV(mip->mi_fend);
+    while (*mip->mi_fend != NUL && spell_iswordp(mip->mi_fend, mip->mi_win));
+
+    // Include the non-word character so that we can check for the word end.
+    if (*mip->mi_fend != NUL)
+	MB_PTR_ADV(mip->mi_fend);
+
+    (void)spell_casefold(mip->mi_win, p, (int)(mip->mi_fend - p),
+			     mip->mi_fword + mip->mi_fwordlen,
+			     MAXWLEN - mip->mi_fwordlen);
+    flen = (int)STRLEN(mip->mi_fword + mip->mi_fwordlen);
+    mip->mi_fwordlen += flen;
+    return flen;
+}
+
+/*
+ * Check case flags for a word.  Return TRUE if the word has the requested
+ * case.
+ */
+    int
+spell_valid_case(
+    int	    wordflags,	    // flags for the checked word.
+    int	    treeflags)	    // flags for the word in the spell tree
+{
+    return ((wordflags == WF_ALLCAP && (treeflags & WF_FIXCAP) == 0)
+	    || ((treeflags & (WF_ALLCAP | WF_KEEPCAP)) == 0
+		&& ((treeflags & WF_ONECAP) == 0
+					   || (wordflags & WF_ONECAP) != 0)));
+}
+
+/*
+ * Return TRUE if spell checking is enabled for "wp".
+ */
+    int
+spell_check_window(win_T *wp)
+{
+    return wp->w_p_spell
+		&& *wp->w_s->b_p_spl != NUL
+		&& wp->w_s->b_langp.ga_len > 0
+		&& *(char **)(wp->w_s->b_langp.ga_data) != NULL;
+}
+
+/*
+ * Return TRUE and give an error if spell checking is not enabled.
+ */
+    static int
+no_spell_checking(win_T *wp)
+{
+    if (spell_check_window(wp))
+	return FALSE;
+    emsg(_(e_spell_checking_is_not_possible));
+    return TRUE;
+}
+
+/*
+ * Move to next spell error.
+ * "curline" is FALSE for "[s", "]s", "[S" and "]S".
+ * "curline" is TRUE to find word under/after cursor in the same line.
+ * For Insert mode completion "dir" is BACKWARD and "curline" is TRUE: move
+ * to after badly spelled word before the cursor.
+ * Return 0 if not found, length of the badly spelled word otherwise.
+ */
+    int
+spell_move_to(
+    win_T	*wp,
+    int		dir,		// FORWARD or BACKWARD
+    int		allwords,	// TRUE for "[s"/"]s", FALSE for "[S"/"]S"
+    int		curline,
+    hlf_T	*attrp)		// return: attributes of bad word or NULL
+				// (only when "dir" is FORWARD)
+{
+    linenr_T	lnum;
+    pos_T	found_pos;
+    int		found_len = 0;
+    char_u	*line;
+    char_u	*p;
+    char_u	*endp;
+    hlf_T	attr = 0;
+    int		len;
+#ifdef FEAT_SYN_HL
+    int		has_syntax = syntax_present(wp);
+#endif
+    int		col;
+    int		can_spell;
+    char_u	*buf = NULL;
+    int		buflen = 0;
+    int		skip = 0;
+    int		capcol = -1;
+    int		found_one = FALSE;
+    int		wrapped = FALSE;
+
+    if (no_spell_checking(wp))
+	return 0;
+
+    /*
+     * Start looking for bad word at the start of the line, because we can't
+     * start halfway a word, we don't know where it starts or ends.
+     *
+     * When searching backwards, we continue in the line to find the last
+     * bad word (in the cursor line: before the cursor).
+     *
+     * We concatenate the start of the next line, so that wrapped words work
+     * (e.g. "et<line-break>cetera").  Doesn't work when searching backwards
+     * though...
+     */
+    lnum = wp->w_cursor.lnum;
+    CLEAR_POS(&found_pos);
+
+    while (!got_int)
+    {
+	int empty_line;
+
+	line = ml_get_buf(wp->w_buffer, lnum, FALSE);
+
+	len = (int)STRLEN(line);
+	if (buflen < len + MAXWLEN + 2)
+	{
+	    vim_free(buf);
+	    buflen = len + MAXWLEN + 2;
+	    buf = alloc(buflen);
+	    if (buf == NULL)
+		break;
+	}
+
+	// In first line check first word for Capital.
+	if (lnum == 1)
+	    capcol = 0;
+
+	// For checking first word with a capital skip white space.
+	if (capcol == 0)
+	    capcol = getwhitecols(line);
+	else if (curline && wp == curwin)
+	{
+	    // For spellbadword(): check if first word needs a capital.
+	    col = getwhitecols(line);
+	    if (check_need_cap(curwin, lnum, col))
+		capcol = col;
+
+	    // Need to get the line again, may have looked at the previous
+	    // one.
+	    line = ml_get_buf(wp->w_buffer, lnum, FALSE);
+	}
+
+	// Copy the line into "buf" and append the start of the next line if
+	// possible.  Note: this ml_get_buf() may make "line" invalid, check
+	// for empty line first.
+	empty_line = *skipwhite(line) == NUL;
+	STRCPY(buf, line);
+	if (lnum < wp->w_buffer->b_ml.ml_line_count)
+	    spell_cat_line(buf + STRLEN(buf),
+			  ml_get_buf(wp->w_buffer, lnum + 1, FALSE), MAXWLEN);
+
+	p = buf + skip;
+	endp = buf + len;
+	while (p < endp)
+	{
+	    // When searching backward don't search after the cursor.  Unless
+	    // we wrapped around the end of the buffer.
+	    if (dir == BACKWARD
+		    && lnum == wp->w_cursor.lnum
+		    && !wrapped
+		    && (colnr_T)(p - buf) >= wp->w_cursor.col)
+		break;
+
+	    // start of word
+	    attr = HLF_COUNT;
+	    len = spell_check(wp, p, &attr, &capcol, FALSE);
+
+	    if (attr != HLF_COUNT)
+	    {
+		// We found a bad word.  Check the attribute.
+		if (allwords || attr == HLF_SPB)
+		{
+		    // When searching forward only accept a bad word after
+		    // the cursor.
+		    if (dir == BACKWARD
+			    || lnum != wp->w_cursor.lnum
+			    || (wrapped
+				|| (colnr_T)(curline ? p - buf + len
+						     : p - buf)
+						  > wp->w_cursor.col))
+		    {
+#ifdef FEAT_SYN_HL
+			if (has_syntax)
+			{
+			    col = (int)(p - buf);
+			    (void)syn_get_id(wp, lnum, (colnr_T)col,
+						    FALSE, &can_spell, FALSE);
+			    if (!can_spell)
+				attr = HLF_COUNT;
+			}
+			else
+#endif
+			    can_spell = TRUE;
+
+			if (can_spell)
+			{
+			    found_one = TRUE;
+			    found_pos.lnum = lnum;
+			    found_pos.col = (int)(p - buf);
+			    found_pos.coladd = 0;
+			    if (dir == FORWARD)
+			    {
+				// No need to search further.
+				wp->w_cursor = found_pos;
+				vim_free(buf);
+				if (attrp != NULL)
+				    *attrp = attr;
+				return len;
+			    }
+			    else if (curline)
+				// Insert mode completion: put cursor after
+				// the bad word.
+				found_pos.col += len;
+			    found_len = len;
+			}
+		    }
+		    else
+			found_one = TRUE;
+		}
+	    }
+
+	    // advance to character after the word
+	    p += len;
+	    capcol -= len;
+	}
+
+	if (dir == BACKWARD && found_pos.lnum != 0)
+	{
+	    // Use the last match in the line (before the cursor).
+	    wp->w_cursor = found_pos;
+	    vim_free(buf);
+	    return found_len;
+	}
+
+	if (curline)
+	    break;	// only check cursor line
+
+	// If we are back at the starting line and searched it again there
+	// is no match, give up.
+	if (lnum == wp->w_cursor.lnum && wrapped)
+	    break;
+
+	// Advance to next line.
+	if (dir == BACKWARD)
+	{
+	    if (lnum > 1)
+		--lnum;
+	    else if (!p_ws)
+		break;	    // at first line and 'nowrapscan'
+	    else
+	    {
+		// Wrap around to the end of the buffer.  May search the
+		// starting line again and accept the last match.
+		lnum = wp->w_buffer->b_ml.ml_line_count;
+		wrapped = TRUE;
+		if (!shortmess(SHM_SEARCH))
+		    give_warning((char_u *)_(top_bot_msg), TRUE);
+	    }
+	    capcol = -1;
+	}
+	else
+	{
+	    if (lnum < wp->w_buffer->b_ml.ml_line_count)
+		++lnum;
+	    else if (!p_ws)
+		break;	    // at first line and 'nowrapscan'
+	    else
+	    {
+		// Wrap around to the start of the buffer.  May search the
+		// starting line again and accept the first match.
+		lnum = 1;
+		wrapped = TRUE;
+		if (!shortmess(SHM_SEARCH))
+		    give_warning((char_u *)_(bot_top_msg), TRUE);
+	    }
+
+	    // If we are back at the starting line and there is no match then
+	    // give up.
+	    if (lnum == wp->w_cursor.lnum && !found_one)
+		break;
+
+	    // Skip the characters at the start of the next line that were
+	    // included in a match crossing line boundaries.
+	    if (attr == HLF_COUNT)
+		skip = (int)(p - endp);
+	    else
+		skip = 0;
+
+	    // Capcol skips over the inserted space.
+	    --capcol;
+
+	    // But after empty line check first word in next line
+	    if (empty_line)
+		capcol = 0;
+	}
+
+	line_breakcheck();
+    }
+
+    vim_free(buf);
+    return 0;
+}
+
+/*
+ * For spell checking: concatenate the start of the following line "line" into
+ * "buf", blanking-out special characters.  Copy less than "maxlen" bytes.
+ * Keep the blanks at the start of the next line, this is used in win_line()
+ * to skip those bytes if the word was OK.
+ */
+    void
+spell_cat_line(char_u *buf, char_u *line, int maxlen)
+{
+    char_u	*p;
+    int		n;
+
+    p = skipwhite(line);
+    while (vim_strchr((char_u *)"*#/\"\t", *p) != NULL)
+	p = skipwhite(p + 1);
+
+    if (*p == NUL)
+	return;
+
+    // Only worth concatenating if there is something else than spaces to
+    // concatenate.
+    n = (int)(p - line) + 1;
+    if (n < maxlen - 1)
+    {
+	vim_memset(buf, ' ', n);
+	vim_strncpy(buf +  n, p, maxlen - 1 - n);
+    }
+}
+
+/*
+ * Structure used for the cookie argument of do_in_runtimepath().
+ */
+typedef struct spelload_S
+{
+    char_u  sl_lang[MAXWLEN + 1];	// language name
+    slang_T *sl_slang;			// resulting slang_T struct
+    int	    sl_nobreak;			// NOBREAK language found
+} spelload_T;
+
+/*
+ * Load word list(s) for "lang" from Vim spell file(s).
+ * "lang" must be the language without the region: e.g., "en".
+ */
+    static void
+spell_load_lang(char_u *lang)
+{
+    char_u	fname_enc[85];
+    int		r;
+    spelload_T	sl;
+    int		round;
+
+    // Copy the language name to pass it to spell_load_cb() as a cookie.
+    // It's truncated when an error is detected.
+    STRCPY(sl.sl_lang, lang);
+    sl.sl_slang = NULL;
+    sl.sl_nobreak = FALSE;
+
+    // Disallow deleting the current buffer.  Autocommands can do weird things
+    // and cause "lang" to be freed.
+    ++curbuf->b_locked;
+
+    // We may retry when no spell file is found for the language, an
+    // autocommand may load it then.
+    for (round = 1; round <= 2; ++round)
+    {
+	/*
+	 * Find the first spell file for "lang" in 'runtimepath' and load it.
+	 */
+	vim_snprintf((char *)fname_enc, sizeof(fname_enc) - 5,
+#ifdef VMS
+					"spell/%s_%s.spl",
+#else
+					"spell/%s.%s.spl",
+#endif
+							   lang, spell_enc());
+	r = do_in_runtimepath(fname_enc, 0, spell_load_cb, &sl);
+
+	if (r == FAIL && *sl.sl_lang != NUL)
+	{
+	    // Try loading the ASCII version.
+	    vim_snprintf((char *)fname_enc, sizeof(fname_enc) - 5,
+#ifdef VMS
+						  "spell/%s_ascii.spl",
+#else
+						  "spell/%s.ascii.spl",
+#endif
+									lang);
+	    r = do_in_runtimepath(fname_enc, 0, spell_load_cb, &sl);
+
+	    if (r == FAIL && *sl.sl_lang != NUL && round == 1
+		    && apply_autocmds(EVENT_SPELLFILEMISSING, lang,
+					      curbuf->b_fname, FALSE, curbuf))
+		continue;
+	    break;
+	}
+	break;
+    }
+
+    if (r == FAIL)
+    {
+	smsg(
+#ifdef VMS
+	_("Warning: Cannot find word list \"%s_%s.spl\" or \"%s_ascii.spl\""),
+#else
+	_("Warning: Cannot find word list \"%s.%s.spl\" or \"%s.ascii.spl\""),
+#endif
+						     lang, spell_enc(), lang);
+    }
+    else if (sl.sl_slang != NULL)
+    {
+	// At least one file was loaded, now load ALL the additions.
+	STRCPY(fname_enc + STRLEN(fname_enc) - 3, "add.spl");
+	do_in_runtimepath(fname_enc, DIP_ALL, spell_load_cb, &sl);
+    }
+
+    --curbuf->b_locked;
+}
+
+/*
+ * Return the encoding used for spell checking: Use 'encoding', except that we
+ * use "latin1" for "latin9".  And limit to 60 characters (just in case).
+ */
+    char_u *
+spell_enc(void)
+{
+
+    if (STRLEN(p_enc) < 60 && STRCMP(p_enc, "iso-8859-15") != 0)
+	return p_enc;
+    return (char_u *)"latin1";
+}
+
+/*
+ * Get the name of the .spl file for the internal wordlist into
+ * "fname[MAXPATHL]".
+ */
+    static void
+int_wordlist_spl(char_u *fname)
+{
+    vim_snprintf((char *)fname, MAXPATHL, SPL_FNAME_TMPL,
+						  int_wordlist, spell_enc());
+}
+
+/*
+ * Allocate a new slang_T for language "lang".  "lang" can be NULL.
+ * Caller must fill "sl_next".
+ */
+    slang_T *
+slang_alloc(char_u *lang)
+{
+    slang_T *lp;
+
+    lp = ALLOC_CLEAR_ONE(slang_T);
+    if (lp != NULL)
+    {
+	if (lang != NULL)
+	    lp->sl_name = vim_strsave(lang);
+	ga_init2(&lp->sl_rep, sizeof(fromto_T), 10);
+	ga_init2(&lp->sl_repsal, sizeof(fromto_T), 10);
+	lp->sl_compmax = MAXWLEN;
+	lp->sl_compsylmax = MAXWLEN;
+	hash_init(&lp->sl_wordcount);
+    }
+
+    return lp;
+}
+
+/*
+ * Free the contents of an slang_T and the structure itself.
+ */
+    void
+slang_free(slang_T *lp)
+{
+    vim_free(lp->sl_name);
+    vim_free(lp->sl_fname);
+    slang_clear(lp);
+    vim_free(lp);
+}
+
+/*
+ * Clear an slang_T so that the file can be reloaded.
+ */
+    void
+slang_clear(slang_T *lp)
+{
+    garray_T	*gap;
+    fromto_T	*ftp;
+    salitem_T	*smp;
+    int		i;
+    int		round;
+
+    VIM_CLEAR(lp->sl_fbyts);
+    VIM_CLEAR(lp->sl_kbyts);
+    VIM_CLEAR(lp->sl_pbyts);
+
+    VIM_CLEAR(lp->sl_fidxs);
+    VIM_CLEAR(lp->sl_kidxs);
+    VIM_CLEAR(lp->sl_pidxs);
+
+    for (round = 1; round <= 2; ++round)
+    {
+	gap = round == 1 ? &lp->sl_rep : &lp->sl_repsal;
+	while (gap->ga_len > 0)
+	{
+	    ftp = &((fromto_T *)gap->ga_data)[--gap->ga_len];
+	    vim_free(ftp->ft_from);
+	    vim_free(ftp->ft_to);
+	}
+	ga_clear(gap);
+    }
+
+    gap = &lp->sl_sal;
+    if (lp->sl_sofo)
+    {
+	// "ga_len" is set to 1 without adding an item for latin1
+	if (gap->ga_data != NULL)
+	    // SOFOFROM and SOFOTO items: free lists of wide characters.
+	    for (i = 0; i < gap->ga_len; ++i)
+		vim_free(((int **)gap->ga_data)[i]);
+    }
+    else
+	// SAL items: free salitem_T items
+	while (gap->ga_len > 0)
+	{
+	    smp = &((salitem_T *)gap->ga_data)[--gap->ga_len];
+	    vim_free(smp->sm_lead);
+	    // Don't free sm_oneof and sm_rules, they point into 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);
+	}
+    ga_clear(gap);
+
+    for (i = 0; i < lp->sl_prefixcnt; ++i)
+	vim_regfree(lp->sl_prefprog[i]);
+    lp->sl_prefixcnt = 0;
+    VIM_CLEAR(lp->sl_prefprog);
+
+    VIM_CLEAR(lp->sl_info);
+
+    VIM_CLEAR(lp->sl_midword);
+
+    vim_regfree(lp->sl_compprog);
+    lp->sl_compprog = NULL;
+    VIM_CLEAR(lp->sl_comprules);
+    VIM_CLEAR(lp->sl_compstartflags);
+    VIM_CLEAR(lp->sl_compallflags);
+
+    VIM_CLEAR(lp->sl_syllable);
+    ga_clear(&lp->sl_syl_items);
+
+    ga_clear_strings(&lp->sl_comppat);
+
+    hash_clear_all(&lp->sl_wordcount, WC_KEY_OFF);
+    hash_init(&lp->sl_wordcount);
+
+    hash_clear_all(&lp->sl_map_hash, 0);
+
+    // Clear info from .sug file.
+    slang_clear_sug(lp);
+
+    lp->sl_compmax = MAXWLEN;
+    lp->sl_compminlen = 0;
+    lp->sl_compsylmax = MAXWLEN;
+    lp->sl_regions[0] = NUL;
+}
+
+/*
+ * Clear the info from the .sug file in "lp".
+ */
+    void
+slang_clear_sug(slang_T *lp)
+{
+    VIM_CLEAR(lp->sl_sbyts);
+    VIM_CLEAR(lp->sl_sidxs);
+    close_spellbuf(lp->sl_sugbuf);
+    lp->sl_sugbuf = NULL;
+    lp->sl_sugloaded = FALSE;
+    lp->sl_sugtime = 0;
+}
+
+/*
+ * Load one spell file and store the info into a slang_T.
+ * Invoked through do_in_runtimepath().
+ */
+    static void
+spell_load_cb(char_u *fname, void *cookie)
+{
+    spelload_T	*slp = (spelload_T *)cookie;
+    slang_T	*slang;
+
+    slang = spell_load_file(fname, slp->sl_lang, NULL, FALSE);
+    if (slang == NULL)
+	return;
+
+    // When a previously loaded file has NOBREAK also use it for the
+    // ".add" files.
+    if (slp->sl_nobreak && slang->sl_add)
+	slang->sl_nobreak = TRUE;
+    else if (slang->sl_nobreak)
+	slp->sl_nobreak = TRUE;
+
+    slp->sl_slang = slang;
+}
+
+
+/*
+ * Add a word to the hashtable of common words.
+ * If it's already there then the counter is increased.
+ */
+    void
+count_common_word(
+    slang_T	*lp,
+    char_u	*word,
+    int		len,	    // word length, -1 for up to NUL
+    int		count)	    // 1 to count once, 10 to init
+{
+    hash_T	hash;
+    hashitem_T	*hi;
+    wordcount_T	*wc;
+    char_u	buf[MAXWLEN];
+    char_u	*p;
+
+    if (len == -1)
+	p = word;
+    else if (len >= MAXWLEN)
+	return;
+    else
+    {
+	vim_strncpy(buf, word, len);
+	p = buf;
+    }
+
+    hash = hash_hash(p);
+    hi = hash_lookup(&lp->sl_wordcount, p, hash);
+    if (HASHITEM_EMPTY(hi))
+    {
+	wc = alloc(offsetof(wordcount_T, wc_word) + STRLEN(p) + 1);
+	if (wc == NULL)
+	    return;
+	STRCPY(wc->wc_word, p);
+	wc->wc_count = count;
+	hash_add_item(&lp->sl_wordcount, hi, wc->wc_word, hash);
+    }
+    else
+    {
+	wc = HI2WC(hi);
+	if ((wc->wc_count += count) < (unsigned)count)	// check for overflow
+	    wc->wc_count = MAXWORDCOUNT;
+    }
+}
+
+/*
+ * Return TRUE if byte "n" appears in "str".
+ * Like strchr() but independent of locale.
+ */
+    int
+byte_in_str(char_u *str, int n)
+{
+    char_u	*p;
+
+    for (p = str; *p != NUL; ++p)
+	if (*p == n)
+	    return TRUE;
+    return FALSE;
+}
+
+#define SY_MAXLEN   30
+typedef struct syl_item_S
+{
+    char_u	sy_chars[SY_MAXLEN];	    // the sequence of chars
+    int		sy_len;
+} syl_item_T;
+
+/*
+ * Truncate "slang->sl_syllable" at the first slash and put the following items
+ * in "slang->sl_syl_items".
+ */
+    int
+init_syl_tab(slang_T *slang)
+{
+    char_u	*p;
+    char_u	*s;
+    int		l;
+    syl_item_T	*syl;
+
+    ga_init2(&slang->sl_syl_items, sizeof(syl_item_T), 4);
+    p = vim_strchr(slang->sl_syllable, '/');
+    while (p != NULL)
+    {
+	*p++ = NUL;
+	if (*p == NUL)	    // trailing slash
+	    break;
+	s = p;
+	p = vim_strchr(p, '/');
+	if (p == NULL)
+	    l = (int)STRLEN(s);
+	else
+	    l = (int)(p - s);
+	if (l >= SY_MAXLEN)
+	    return SP_FORMERROR;
+	if (ga_grow(&slang->sl_syl_items, 1) == FAIL)
+	    return SP_OTHERERROR;
+	syl = ((syl_item_T *)slang->sl_syl_items.ga_data)
+					       + slang->sl_syl_items.ga_len++;
+	vim_strncpy(syl->sy_chars, s, l);
+	syl->sy_len = l;
+    }
+    return OK;
+}
+
+/*
+ * Count the number of syllables in "word".
+ * When "word" contains spaces the syllables after the last space are counted.
+ * Returns zero if syllables are not defines.
+ */
+    static int
+count_syllables(slang_T *slang, char_u *word)
+{
+    int		cnt = 0;
+    int		skip = FALSE;
+    char_u	*p;
+    int		len;
+    int		i;
+    syl_item_T	*syl;
+    int		c;
+
+    if (slang->sl_syllable == NULL)
+	return 0;
+
+    for (p = word; *p != NUL; p += len)
+    {
+	// When running into a space reset counter.
+	if (*p == ' ')
+	{
+	    len = 1;
+	    cnt = 0;
+	    continue;
+	}
+
+	// Find longest match of syllable items.
+	len = 0;
+	for (i = 0; i < slang->sl_syl_items.ga_len; ++i)
+	{
+	    syl = ((syl_item_T *)slang->sl_syl_items.ga_data) + i;
+	    if (syl->sy_len > len
+			       && STRNCMP(p, syl->sy_chars, syl->sy_len) == 0)
+		len = syl->sy_len;
+	}
+	if (len != 0)	// found a match, count syllable
+	{
+	    ++cnt;
+	    skip = FALSE;
+	}
+	else
+	{
+	    // No recognized syllable item, at least a syllable char then?
+	    c = mb_ptr2char(p);
+	    len = (*mb_ptr2len)(p);
+	    if (vim_strchr(slang->sl_syllable, c) == NULL)
+		skip = FALSE;	    // No, search for next syllable
+	    else if (!skip)
+	    {
+		++cnt;		    // Yes, count it
+		skip = TRUE;	    // don't count following syllable chars
+	    }
+	}
+    }
+    return cnt;
+}
+
+/*
+ * Parse 'spelllang' and set w_s->b_langp accordingly.
+ * Returns NULL if it's OK, an untranslated error message otherwise.
+ */
+    char *
+parse_spelllang(win_T *wp)
+{
+    garray_T	ga;
+    char_u	*splp;
+    char_u	*region;
+    char_u	region_cp[3];
+    int		filename;
+    int		region_mask;
+    slang_T	*slang;
+    int		c;
+    char_u	lang[MAXWLEN + 1];
+    char_u	spf_name[MAXPATHL];
+    int		len;
+    char_u	*p;
+    int		round;
+    char_u	*spf;
+    char_u	*use_region = NULL;
+    int		dont_use_region = FALSE;
+    int		nobreak = FALSE;
+    int		i, j;
+    langp_T	*lp, *lp2;
+    static int	recursive = FALSE;
+    char	*ret_msg = NULL;
+    char_u	*spl_copy;
+    bufref_T	bufref;
+
+    set_bufref(&bufref, wp->w_buffer);
+
+    // We don't want to do this recursively.  May happen when a language is
+    // not available and the SpellFileMissing autocommand opens a new buffer
+    // in which 'spell' is set.
+    if (recursive)
+	return NULL;
+    recursive = TRUE;
+
+    ga_init2(&ga, sizeof(langp_T), 2);
+    clear_midword(wp);
+
+    // Make a copy of 'spelllang', the SpellFileMissing autocommands may change
+    // it under our fingers.
+    spl_copy = vim_strsave(wp->w_s->b_p_spl);
+    if (spl_copy == NULL)
+	goto theend;
+
+    wp->w_s->b_cjk = 0;
+
+    // Loop over comma separated language names.
+    for (splp = spl_copy; *splp != NUL; )
+    {
+	// Get one language name.
+	copy_option_part(&splp, lang, MAXWLEN, ",");
+	region = NULL;
+	len = (int)STRLEN(lang);
+
+	if (!valid_spelllang(lang))
+	    continue;
+
+	if (STRCMP(lang, "cjk") == 0)
+	{
+	    wp->w_s->b_cjk = 1;
+	    continue;
+	}
+
+	// If the name ends in ".spl" use it as the name of the spell file.
+	// If there is a region name let "region" point to it and remove it
+	// from the name.
+	if (len > 4 && fnamecmp(lang + len - 4, ".spl") == 0)
+	{
+	    filename = TRUE;
+
+	    // Locate a region and remove it from the file name.
+	    p = vim_strchr(gettail(lang), '_');
+	    if (p != NULL && ASCII_ISALPHA(p[1]) && ASCII_ISALPHA(p[2])
+						      && !ASCII_ISALPHA(p[3]))
+	    {
+		vim_strncpy(region_cp, p + 1, 2);
+		mch_memmove(p, p + 3, len - (p - lang) - 2);
+		region = region_cp;
+	    }
+	    else
+		dont_use_region = TRUE;
+
+	    // Check if we loaded this language before.
+	    FOR_ALL_SPELL_LANGS(slang)
+		if (fullpathcmp(lang, slang->sl_fname, FALSE, TRUE) == FPC_SAME)
+		    break;
+	}
+	else
+	{
+	    filename = FALSE;
+	    if (len > 3 && lang[len - 3] == '_')
+	    {
+		region = lang + len - 2;
+		len -= 3;
+		lang[len] = NUL;
+	    }
+	    else
+		dont_use_region = TRUE;
+
+	    // Check if we loaded this language before.
+	    FOR_ALL_SPELL_LANGS(slang)
+		if (STRICMP(lang, slang->sl_name) == 0)
+		    break;
+	}
+
+	if (region != NULL)
+	{
+	    // If the region differs from what was used before then don't
+	    // use it for 'spellfile'.
+	    if (use_region != NULL && STRCMP(region, use_region) != 0)
+		dont_use_region = TRUE;
+	    use_region = region;
+	}
+
+	// If not found try loading the language now.
+	if (slang == NULL)
+	{
+	    if (filename)
+		(void)spell_load_file(lang, lang, NULL, FALSE);
+	    else
+	    {
+		spell_load_lang(lang);
+		// SpellFileMissing autocommands may do anything, including
+		// destroying the buffer we are using or closing the window.
+		if (!bufref_valid(&bufref) || !win_valid_any_tab(wp))
+		{
+		    ret_msg = N_(e_spellfilemising_autocommand_deleted_buffer);
+		    goto theend;
+		}
+	    }
+	}
+
+	/*
+	 * Loop over the languages, there can be several files for "lang".
+	 */
+	FOR_ALL_SPELL_LANGS(slang)
+	    if (filename ? fullpathcmp(lang, slang->sl_fname, FALSE, TRUE)
+								    == FPC_SAME
+			 : STRICMP(lang, slang->sl_name) == 0)
+	    {
+		region_mask = REGION_ALL;
+		if (!filename && region != NULL)
+		{
+		    // find region in sl_regions
+		    c = find_region(slang->sl_regions, region);
+		    if (c == REGION_ALL)
+		    {
+			if (slang->sl_add)
+			{
+			    if (*slang->sl_regions != NUL)
+				// This addition file is for other regions.
+				region_mask = 0;
+			}
+			else
+			    // This is probably an error.  Give a warning and
+			    // accept the words anyway.
+			    smsg(_("Warning: region %s not supported"),
+								      region);
+		    }
+		    else
+			region_mask = 1 << c;
+		}
+
+		if (region_mask != 0)
+		{
+		    if (ga_grow(&ga, 1) == FAIL)
+		    {
+			ga_clear(&ga);
+			ret_msg = e_out_of_memory;
+			goto theend;
+		    }
+		    LANGP_ENTRY(ga, ga.ga_len)->lp_slang = slang;
+		    LANGP_ENTRY(ga, ga.ga_len)->lp_region = region_mask;
+		    ++ga.ga_len;
+		    use_midword(slang, wp);
+		    if (slang->sl_nobreak)
+			nobreak = TRUE;
+		}
+	    }
+    }
+
+    // round 0: load int_wordlist, if possible.
+    // round 1: load first name in 'spellfile'.
+    // round 2: load second name in 'spellfile.
+    // etc.
+    spf = curwin->w_s->b_p_spf;
+    for (round = 0; round == 0 || *spf != NUL; ++round)
+    {
+	if (round == 0)
+	{
+	    // Internal wordlist, if there is one.
+	    if (int_wordlist == NULL)
+		continue;
+	    int_wordlist_spl(spf_name);
+	}
+	else
+	{
+	    // One entry in 'spellfile'.
+	    copy_option_part(&spf, spf_name, MAXPATHL - 5, ",");
+	    STRCAT(spf_name, ".spl");
+
+	    // If it was already found above then skip it.
+	    for (c = 0; c < ga.ga_len; ++c)
+	    {
+		p = LANGP_ENTRY(ga, c)->lp_slang->sl_fname;
+		if (p != NULL && fullpathcmp(spf_name, p, FALSE, TRUE)
+								== FPC_SAME)
+		    break;
+	    }
+	    if (c < ga.ga_len)
+		continue;
+	}
+
+	// Check if it was loaded already.
+	FOR_ALL_SPELL_LANGS(slang)
+	    if (fullpathcmp(spf_name, slang->sl_fname, FALSE, TRUE)
+								== FPC_SAME)
+		break;
+	if (slang == NULL)
+	{
+	    // Not loaded, try loading it now.  The language name includes the
+	    // region name, the region is ignored otherwise.  for int_wordlist
+	    // use an arbitrary name.
+	    if (round == 0)
+		STRCPY(lang, "internal wordlist");
+	    else
+	    {
+		vim_strncpy(lang, gettail(spf_name), MAXWLEN);
+		p = vim_strchr(lang, '.');
+		if (p != NULL)
+		    *p = NUL;	// truncate at ".encoding.add"
+	    }
+	    slang = spell_load_file(spf_name, lang, NULL, TRUE);
+
+	    // If one of the languages has NOBREAK we assume the addition
+	    // files also have this.
+	    if (slang != NULL && nobreak)
+		slang->sl_nobreak = TRUE;
+	}
+	if (slang != NULL && ga_grow(&ga, 1) == OK)
+	{
+	    region_mask = REGION_ALL;
+	    if (use_region != NULL && !dont_use_region)
+	    {
+		// find region in sl_regions
+		c = find_region(slang->sl_regions, use_region);
+		if (c != REGION_ALL)
+		    region_mask = 1 << c;
+		else if (*slang->sl_regions != NUL)
+		    // This spell file is for other regions.
+		    region_mask = 0;
+	    }
+
+	    if (region_mask != 0)
+	    {
+		LANGP_ENTRY(ga, ga.ga_len)->lp_slang = slang;
+		LANGP_ENTRY(ga, ga.ga_len)->lp_sallang = NULL;
+		LANGP_ENTRY(ga, ga.ga_len)->lp_replang = NULL;
+		LANGP_ENTRY(ga, ga.ga_len)->lp_region = region_mask;
+		++ga.ga_len;
+		use_midword(slang, wp);
+	    }
+	}
+    }
+
+    // Everything is fine, store the new b_langp value.
+    ga_clear(&wp->w_s->b_langp);
+    wp->w_s->b_langp = ga;
+
+    // For each language figure out what language to use for sound folding and
+    // REP items.  If the language doesn't support it itself use another one
+    // with the same name.  E.g. for "en-math" use "en".
+    for (i = 0; i < ga.ga_len; ++i)
+    {
+	lp = LANGP_ENTRY(ga, i);
+
+	// sound folding
+	if (lp->lp_slang->sl_sal.ga_len > 0)
+	    // language does sound folding itself
+	    lp->lp_sallang = lp->lp_slang;
+	else
+	    // find first similar language that does sound folding
+	    for (j = 0; j < ga.ga_len; ++j)
+	    {
+		lp2 = LANGP_ENTRY(ga, j);
+		if (lp2->lp_slang->sl_sal.ga_len > 0
+			&& STRNCMP(lp->lp_slang->sl_name,
+					      lp2->lp_slang->sl_name, 2) == 0)
+		{
+		    lp->lp_sallang = lp2->lp_slang;
+		    break;
+		}
+	    }
+
+	// REP items
+	if (lp->lp_slang->sl_rep.ga_len > 0)
+	    // language has REP items itself
+	    lp->lp_replang = lp->lp_slang;
+	else
+	    // find first similar language that has REP items
+	    for (j = 0; j < ga.ga_len; ++j)
+	    {
+		lp2 = LANGP_ENTRY(ga, j);
+		if (lp2->lp_slang->sl_rep.ga_len > 0
+			&& STRNCMP(lp->lp_slang->sl_name,
+					      lp2->lp_slang->sl_name, 2) == 0)
+		{
+		    lp->lp_replang = lp2->lp_slang;
+		    break;
+		}
+	    }
+    }
+    redraw_win_later(wp, UPD_NOT_VALID);
+
+theend:
+    vim_free(spl_copy);
+    recursive = FALSE;
+    return ret_msg;
+}
+
+/*
+ * Clear the midword characters for buffer "buf".
+ */
+    static void
+clear_midword(win_T *wp)
+{
+    CLEAR_FIELD(wp->w_s->b_spell_ismw);
+    VIM_CLEAR(wp->w_s->b_spell_ismw_mb);
+}
+
+/*
+ * Use the "sl_midword" field of language "lp" for buffer "buf".
+ * They add up to any currently used midword characters.
+ */
+    static void
+use_midword(slang_T *lp, win_T *wp)
+{
+    char_u	*p;
+
+    if (lp->sl_midword == NULL)	    // there aren't any
+	return;
+
+    for (p = lp->sl_midword; *p != NUL; )
+	if (has_mbyte)
+	{
+	    int	    c, l, n;
+	    char_u  *bp;
+
+	    c = mb_ptr2char(p);
+	    l = (*mb_ptr2len)(p);
+	    if (c < 256 && l <= 2)
+		wp->w_s->b_spell_ismw[c] = TRUE;
+	    else if (wp->w_s->b_spell_ismw_mb == NULL)
+		// First multi-byte char in "b_spell_ismw_mb".
+		wp->w_s->b_spell_ismw_mb = vim_strnsave(p, l);
+	    else
+	    {
+		// Append multi-byte chars to "b_spell_ismw_mb".
+		n = (int)STRLEN(wp->w_s->b_spell_ismw_mb);
+		bp = vim_strnsave(wp->w_s->b_spell_ismw_mb, n + l);
+		if (bp != NULL)
+		{
+		    vim_free(wp->w_s->b_spell_ismw_mb);
+		    wp->w_s->b_spell_ismw_mb = bp;
+		    vim_strncpy(bp + n, p, l);
+		}
+	    }
+	    p += l;
+	}
+	else
+	    wp->w_s->b_spell_ismw[*p++] = TRUE;
+}
+
+/*
+ * Find the region "region[2]" in "rp" (points to "sl_regions").
+ * Each region is simply stored as the two characters of its name.
+ * Returns the index if found (first is 0), REGION_ALL if not found.
+ */
+    static int
+find_region(char_u *rp, char_u *region)
+{
+    int		i;
+
+    for (i = 0; ; i += 2)
+    {
+	if (rp[i] == NUL)
+	    return REGION_ALL;
+	if (rp[i] == region[0] && rp[i + 1] == region[1])
+	    break;
+    }
+    return i / 2;
+}
+
+/*
+ * Return case type of word:
+ * w word	0
+ * Word		WF_ONECAP
+ * W WORD	WF_ALLCAP
+ * WoRd	wOrd	WF_KEEPCAP
+ */
+    int
+captype(
+    char_u	*word,
+    char_u	*end)	    // When NULL use up to NUL byte.
+{
+    char_u	*p;
+    int		c;
+    int		firstcap;
+    int		allcap;
+    int		past_second = FALSE;	// past second word char
+
+    // find first letter
+    for (p = word; !spell_iswordp_nmw(p, curwin); MB_PTR_ADV(p))
+	if (end == NULL ? *p == NUL : p >= end)
+	    return 0;	    // only non-word characters, illegal word
+    if (has_mbyte)
+	c = mb_ptr2char_adv(&p);
+    else
+	c = *p++;
+    firstcap = allcap = SPELL_ISUPPER(c);
+
+    /*
+     * Need to check all letters to find a word with mixed upper/lower.
+     * But a word with an upper char only at start is a ONECAP.
+     */
+    for ( ; end == NULL ? *p != NUL : p < end; MB_PTR_ADV(p))
+	if (spell_iswordp_nmw(p, curwin))
+	{
+	    c = PTR2CHAR(p);
+	    if (!SPELL_ISUPPER(c))
+	    {
+		// UUl -> KEEPCAP
+		if (past_second && allcap)
+		    return WF_KEEPCAP;
+		allcap = FALSE;
+	    }
+	    else if (!allcap)
+		// UlU -> KEEPCAP
+		return WF_KEEPCAP;
+	    past_second = TRUE;
+	}
+
+    if (allcap)
+	return WF_ALLCAP;
+    if (firstcap)
+	return WF_ONECAP;
+    return 0;
+}
+
+/*
+ * Delete the internal wordlist and its .spl file.
+ */
+    void
+spell_delete_wordlist(void)
+{
+    char_u	fname[MAXPATHL];
+
+    if (int_wordlist == NULL)
+	return;
+
+    mch_remove(int_wordlist);
+    int_wordlist_spl(fname);
+    mch_remove(fname);
+    VIM_CLEAR(int_wordlist);
+}
+
+/*
+ * Free all languages.
+ */
+    void
+spell_free_all(void)
+{
+    slang_T	*slang;
+    buf_T	*buf;
+
+    // Go through all buffers and handle 'spelllang'. <VN>
+    FOR_ALL_BUFFERS(buf)
+	ga_clear(&buf->b_s.b_langp);
+
+    while (first_lang != NULL)
+    {
+	slang = first_lang;
+	first_lang = slang->sl_next;
+	slang_free(slang);
+    }
+
+    spell_delete_wordlist();
+
+    VIM_CLEAR(repl_to);
+    VIM_CLEAR(repl_from);
+}
+
+/*
+ * Clear all spelling tables and reload them.
+ * Used after 'encoding' is set and when ":mkspell" was used.
+ */
+    void
+spell_reload(void)
+{
+    win_T	*wp;
+
+    // Initialize the table for spell_iswordp().
+    init_spell_chartab();
+
+    // Unload all allocated memory.
+    spell_free_all();
+
+    // Go through all buffers and handle 'spelllang'.
+    FOR_ALL_WINDOWS(wp)
+    {
+	// Only load the wordlists when 'spelllang' is set and there is a
+	// window for this buffer in which 'spell' is set.
+	if (*wp->w_s->b_p_spl != NUL)
+	{
+		if (wp->w_p_spell)
+		{
+		    (void)parse_spelllang(wp);
+		    break;
+		}
+	}
+    }
+}
+
+/*
+ * Open a spell buffer.  This is a nameless buffer that is not in the buffer
+ * list and only contains text lines.  Can use a swapfile to reduce memory
+ * use.
+ * Most other fields are invalid!  Esp. watch out for string options being
+ * NULL and there is no undo info.
+ * Returns NULL when out of memory.
+ */
+    buf_T *
+open_spellbuf(void)
+{
+    buf_T	*buf;
+
+    buf = ALLOC_CLEAR_ONE(buf_T);
+    if (buf == NULL)
+	return NULL;
+
+    buf->b_spell = TRUE;
+    buf->b_p_swf = TRUE;	// may create a swap file
+#ifdef FEAT_CRYPT
+    buf->b_p_key = empty_option;
+#endif
+    ml_open(buf);
+    ml_open_file(buf);	// create swap file now
+    return buf;
+}
+
+/*
+ * Close the buffer used for spell info.
+ */
+    void
+close_spellbuf(buf_T *buf)
+{
+    if (buf == NULL)
+	return;
+
+    ml_close(buf, TRUE);
+    vim_free(buf);
+}
+
+/*
+ * Init the chartab used for spelling for ASCII.
+ */
+    void
+clear_spell_chartab(spelltab_T *sp)
+{
+    int		i;
+
+    // Init everything to FALSE (zero).
+    CLEAR_FIELD(sp->st_isw);
+    CLEAR_FIELD(sp->st_isu);
+    for (i = 0; i < 256; ++i)
+    {
+	sp->st_fold[i] = i;
+	sp->st_upper[i] = i;
+    }
+
+    // We include digits.  A word shouldn't start with a digit, but handling
+    // that is done separately.
+    for (i = '0'; i <= '9'; ++i)
+	sp->st_isw[i] = TRUE;
+    for (i = 'A'; i <= 'Z'; ++i)
+    {
+	sp->st_isw[i] = TRUE;
+	sp->st_isu[i] = TRUE;
+	sp->st_fold[i] = i + 0x20;
+    }
+    for (i = 'a'; i <= 'z'; ++i)
+    {
+	sp->st_isw[i] = TRUE;
+	sp->st_upper[i] = i - 0x20;
+    }
+}
+
+/*
+ * Init the chartab used for spelling.  Only depends on 'encoding'.
+ * Called once while starting up and when 'encoding' changes.
+ * The default is to use isalpha(), but the spell file should define the word
+ * characters to make it possible that 'encoding' differs from the current
+ * locale.  For utf-8 we don't use isalpha() but our own functions.
+ */
+    void
+init_spell_chartab(void)
+{
+    int	    i;
+
+    did_set_spelltab = FALSE;
+    clear_spell_chartab(&spelltab);
+    if (enc_dbcs)
+    {
+	// DBCS: assume double-wide characters are word characters.
+	for (i = 128; i <= 255; ++i)
+	    if (MB_BYTE2LEN(i) == 2)
+		spelltab.st_isw[i] = TRUE;
+    }
+    else if (enc_utf8)
+    {
+	for (i = 128; i < 256; ++i)
+	{
+	    int f = utf_fold(i);
+	    int u = utf_toupper(i);
+
+	    spelltab.st_isu[i] = utf_isupper(i);
+	    spelltab.st_isw[i] = spelltab.st_isu[i] || utf_islower(i);
+	    // The folded/upper-cased value is different between latin1 and
+	    // utf8 for 0xb5, causing E763 for no good reason.  Use the latin1
+	    // value for utf-8 to avoid this.
+	    spelltab.st_fold[i] = (f < 256) ? f : i;
+	    spelltab.st_upper[i] = (u < 256) ? u : i;
+	}
+    }
+    else
+    {
+	// Rough guess: use locale-dependent library functions.
+	for (i = 128; i < 256; ++i)
+	{
+	    if (MB_ISUPPER(i))
+	    {
+		spelltab.st_isw[i] = TRUE;
+		spelltab.st_isu[i] = TRUE;
+		spelltab.st_fold[i] = MB_TOLOWER(i);
+	    }
+	    else if (MB_ISLOWER(i))
+	    {
+		spelltab.st_isw[i] = TRUE;
+		spelltab.st_upper[i] = MB_TOUPPER(i);
+	    }
+	}
+    }
+}
+
+
+/*
+ * Return TRUE if "p" points to a word character.
+ * As a special case we see "midword" characters as word character when it is
+ * followed by a word character.  This finds they'there but not 'they there'.
+ * Thus this only works properly when past the first character of the word.
+ */
+    int
+spell_iswordp(
+    char_u	*p,
+    win_T	*wp)	    // buffer used
+{
+    char_u	*s;
+    int		l;
+    int		c;
+
+    if (has_mbyte)
+    {
+	l = mb_ptr2len(p);
+	s = p;
+	if (l == 1)
+	{
+	    // be quick for ASCII
+	    if (wp->w_s->b_spell_ismw[*p])
+		s = p + 1;		// skip a mid-word character
+	}
+	else
+	{
+	    c = mb_ptr2char(p);
+	    if (c < 256 ? wp->w_s->b_spell_ismw[c]
+		    : (wp->w_s->b_spell_ismw_mb != NULL
+			   && vim_strchr(wp->w_s->b_spell_ismw_mb, c) != NULL))
+		s = p + l;
+	}
+
+	c = mb_ptr2char(s);
+	if (c > 255)
+	    return spell_mb_isword_class(mb_get_class(s), wp);
+	return spelltab.st_isw[c];
+    }
+
+    return spelltab.st_isw[wp->w_s->b_spell_ismw[*p] ? p[1] : p[0]];
+}
+
+/*
+ * Return TRUE if "p" points to a word character.
+ * Unlike spell_iswordp() this doesn't check for "midword" characters.
+ */
+    int
+spell_iswordp_nmw(char_u *p, win_T *wp)
+{
+    int		c;
+
+    if (has_mbyte)
+    {
+	c = mb_ptr2char(p);
+	if (c > 255)
+	    return spell_mb_isword_class(mb_get_class(p), wp);
+	return spelltab.st_isw[c];
+    }
+    return spelltab.st_isw[*p];
+}
+
+/*
+ * Return TRUE if word class indicates a word character.
+ * Only for characters above 255.
+ * Unicode subscript and superscript are not considered word characters.
+ * See also dbcs_class() and utf_class() in mbyte.c.
+ */
+    static int
+spell_mb_isword_class(int cl, win_T *wp)
+{
+    if (wp->w_s->b_cjk)
+	// East Asian characters are not considered word characters.
+	return cl == 2 || cl == 0x2800;
+    return cl >= 2 && cl != 0x2070 && cl != 0x2080 && cl != 3;
+}
+
+/*
+ * Return TRUE if "p" points to a word character.
+ * Wide version of spell_iswordp().
+ */
+    static int
+spell_iswordp_w(int *p, win_T *wp)
+{
+    int		*s;
+
+    if (*p < 256 ? wp->w_s->b_spell_ismw[*p]
+		 : (wp->w_s->b_spell_ismw_mb != NULL
+			     && vim_strchr(wp->w_s->b_spell_ismw_mb, *p) != NULL))
+	s = p + 1;
+    else
+	s = p;
+
+    if (*s > 255)
+    {
+	if (enc_utf8)
+	    return spell_mb_isword_class(utf_class(*s), wp);
+	if (enc_dbcs)
+	    return spell_mb_isword_class(
+				dbcs_class((unsigned)*s >> 8, *s & 0xff), wp);
+	return 0;
+    }
+    return spelltab.st_isw[*s];
+}
+
+/*
+ * Case-fold "str[len]" into "buf[buflen]".  The result is NUL terminated.
+ * Uses the character definitions from the .spl file.
+ * When using a multi-byte 'encoding' the length may change!
+ * Returns FAIL when something wrong.
+ */
+    int
+spell_casefold(
+    win_T	*wp,
+    char_u	*str,
+    int		len,
+    char_u	*buf,
+    int		buflen)
+{
+    int		i;
+
+    if (len >= buflen)
+    {
+	buf[0] = NUL;
+	return FAIL;		// result will not fit
+    }
+
+    if (has_mbyte)
+    {
+	int	outi = 0;
+	char_u	*p;
+	int	c;
+
+	// Fold one character at a time.
+	for (p = str; p < str + len; )
+	{
+	    if (outi + MB_MAXBYTES > buflen)
+	    {
+		buf[outi] = NUL;
+		return FAIL;
+	    }
+	    c = mb_cptr2char_adv(&p);
+
+	    // Exception: greek capital sigma 0x03A3 folds to 0x03C3, except
+	    // when it is the last character in a word, then it folds to
+	    // 0x03C2.
+	    if (c == 0x03a3 || c == 0x03c2)
+	    {
+		if (p == str + len || !spell_iswordp(p, wp))
+		    c = 0x03c2;
+		else
+		    c = 0x03c3;
+	    }
+	    else
+		c = SPELL_TOFOLD(c);
+
+	    outi += mb_char2bytes(c, buf + outi);
+	}
+	buf[outi] = NUL;
+    }
+    else
+    {
+	// Be quick for non-multibyte encodings.
+	for (i = 0; i < len; ++i)
+	    buf[i] = spelltab.st_fold[str[i]];
+	buf[i] = NUL;
+    }
+
+    return OK;
+}
+
+/*
+ * Check if the word at line "lnum" column "col" is required to start with a
+ * capital.  This uses 'spellcapcheck' of the buffer in window "wp".
+ */
+    int
+check_need_cap(win_T *wp, linenr_T lnum, colnr_T col)
+{
+    if (wp->w_s->b_cap_prog == NULL)
+	return FALSE;
+
+    int		need_cap = FALSE;
+    char_u	*line = col ? ml_get_buf(wp->w_buffer, lnum, FALSE) : NULL;
+    char_u	*line_copy = NULL;
+    colnr_T	endcol = 0;
+
+    if (col == 0 || getwhitecols(line) >= col)
+    {
+	// At start of line, check if previous line is empty or sentence
+	// ends there.
+	if (lnum == 1)
+	    need_cap = TRUE;
+	else
+	{
+	    line = ml_get_buf(wp->w_buffer, lnum - 1, FALSE);
+	    if (*skipwhite(line) == NUL)
+		need_cap = TRUE;
+	    else
+	    {
+		// Append a space in place of the line break.
+		line_copy = concat_str(line, (char_u *)" ");
+		if (line_copy == NULL)
+		    return FALSE;
+
+		line = line_copy;
+		endcol = (colnr_T)STRLEN(line);
+	    }
+	}
+    }
+    else
+	endcol = col;
+
+    if (endcol > 0)
+    {
+	// Check if sentence ends before the bad word.
+	regmatch_T	regmatch;
+	regmatch.regprog = wp->w_s->b_cap_prog;
+	regmatch.rm_ic = FALSE;
+	char_u *p = line + endcol;
+	for (;;)
+	{
+	    MB_PTR_BACK(line, p);
+	    if (p == line || spell_iswordp_nmw(p, wp))
+		break;
+	    if (vim_regexec(&regmatch, p, 0)
+					 && regmatch.endp[0] == line + endcol)
+	    {
+		need_cap = TRUE;
+		break;
+	    }
+	}
+	wp->w_s->b_cap_prog = regmatch.regprog;
+    }
+
+    vim_free(line_copy);
+
+    return need_cap;
+}
+
+
+/*
+ * ":spellrepall"
+ */
+    void
+ex_spellrepall(exarg_T *eap UNUSED)
+{
+    pos_T	pos = curwin->w_cursor;
+    char_u	*frompat;
+    char_u	*line;
+    char_u	*p;
+    int		save_ws = p_ws;
+    linenr_T	prev_lnum = 0;
+
+    if (repl_from == NULL || repl_to == NULL)
+    {
+	emsg(_(e_no_previous_spell_replacement));
+	return;
+    }
+    size_t	repl_from_len = STRLEN(repl_from);
+    size_t	repl_to_len = STRLEN(repl_to);
+    int		addlen = (int)(repl_to_len - repl_from_len);
+
+    frompat = alloc(repl_from_len + 7);
+    if (frompat == NULL)
+	return;
+    sprintf((char *)frompat, "\\V\\<%s\\>", repl_from);
+    p_ws = FALSE;
+
+    sub_nsubs = 0;
+    sub_nlines = 0;
+    curwin->w_cursor.lnum = 0;
+    while (!got_int)
+    {
+	if (do_search(NULL, '/', '/', frompat, 1L, SEARCH_KEEP, NULL) == 0
+						   || u_save_cursor() == FAIL)
+	    break;
+
+	// Only replace when the right word isn't there yet.  This happens
+	// when changing "etc" to "etc.".
+	line = ml_get_curline();
+	if (addlen <= 0 || STRNCMP(line + curwin->w_cursor.col,
+						   repl_to, repl_to_len) != 0)
+	{
+	    p = alloc(STRLEN(line) + addlen + 1);
+	    if (p == NULL)
+		break;
+	    mch_memmove(p, line, curwin->w_cursor.col);
+	    STRCPY(p + curwin->w_cursor.col, repl_to);
+	    STRCAT(p, line + curwin->w_cursor.col + repl_from_len);
+	    ml_replace(curwin->w_cursor.lnum, p, FALSE);
+	    changed_bytes(curwin->w_cursor.lnum, curwin->w_cursor.col);
+#if defined(FEAT_PROP_POPUP)
+	    if (curbuf->b_has_textprop && addlen != 0)
+		adjust_prop_columns(curwin->w_cursor.lnum,
+				 curwin->w_cursor.col, addlen, APC_SUBSTITUTE);
+#endif
+
+	    if (curwin->w_cursor.lnum != prev_lnum)
+	    {
+		++sub_nlines;
+		prev_lnum = curwin->w_cursor.lnum;
+	    }
+	    ++sub_nsubs;
+	}
+	curwin->w_cursor.col += (colnr_T)repl_to_len;
+    }
+
+    p_ws = save_ws;
+    curwin->w_cursor = pos;
+    vim_free(frompat);
+
+    if (sub_nsubs == 0)
+	semsg(_(e_not_found_str), repl_from);
+    else
+	do_sub_msg(FALSE);
+}
+
+/*
+ * Make a copy of "word", with the first letter upper or lower cased, to
+ * "wcopy[MAXWLEN]".  "word" must not be empty.
+ * The result is NUL terminated.
+ */
+    void
+onecap_copy(
+    char_u	*word,
+    char_u	*wcopy,
+    int		upper)	    // TRUE: first letter made upper case
+{
+    char_u	*p;
+    int		c;
+    int		l;
+
+    p = word;
+    if (has_mbyte)
+	c = mb_cptr2char_adv(&p);
+    else
+	c = *p++;
+    if (upper)
+	c = SPELL_TOUPPER(c);
+    else
+	c = SPELL_TOFOLD(c);
+    if (has_mbyte)
+	l = mb_char2bytes(c, wcopy);
+    else
+    {
+	l = 1;
+	wcopy[0] = c;
+    }
+    vim_strncpy(wcopy + l, p, MAXWLEN - l - 1);
+}
+
+/*
+ * Make a copy of "word" with all the letters upper cased into
+ * "wcopy[MAXWLEN]".  The result is NUL terminated.
+ */
+    void
+allcap_copy(char_u *word, char_u *wcopy)
+{
+    char_u	*s;
+    char_u	*d;
+    int		c;
+
+    d = wcopy;
+    for (s = word; *s != NUL; )
+    {
+	if (has_mbyte)
+	    c = mb_cptr2char_adv(&s);
+	else
+	    c = *s++;
+
+	// We only change 0xdf to SS when we are certain latin1 is used.  It
+	// would cause weird errors in other 8-bit encodings.
+	if (enc_latin1like && c == 0xdf)
+	{
+	    c = 'S';
+	    if (d - wcopy >= MAXWLEN - 1)
+		break;
+	    *d++ = c;
+	}
+	else
+	    c = SPELL_TOUPPER(c);
+
+	if (has_mbyte)
+	{
+	    if (d - wcopy >= MAXWLEN - MB_MAXBYTES)
+		break;
+	    d += mb_char2bytes(c, d);
+	}
+	else
+	{
+	    if (d - wcopy >= MAXWLEN - 1)
+		break;
+	    *d++ = c;
+	}
+    }
+    *d = NUL;
+}
+
+/*
+ * Case-folding may change the number of bytes: Count nr of chars in
+ * fword[flen] and return the byte length of that many chars in "word".
+ */
+    int
+nofold_len(char_u *fword, int flen, char_u *word)
+{
+    char_u	*p;
+    int		i = 0;
+
+    for (p = fword; p < fword + flen; MB_PTR_ADV(p))
+	++i;
+    for (p = word; i > 0; MB_PTR_ADV(p))
+	--i;
+    return (int)(p - word);
+}
+
+/*
+ * Copy "fword" to "cword", fixing case according to "flags".
+ */
+    void
+make_case_word(char_u *fword, char_u *cword, int flags)
+{
+    if (flags & WF_ALLCAP)
+	// Make it all upper-case
+	allcap_copy(fword, cword);
+    else if (flags & WF_ONECAP)
+	// Make the first letter upper-case
+	onecap_copy(fword, cword, TRUE);
+    else
+	// Use goodword as-is.
+	STRCPY(cword, fword);
+}
+
+#if defined(FEAT_EVAL) || defined(PROTO)
+/*
+ * Soundfold a string, for soundfold().
+ * Result is in allocated memory, NULL for an error.
+ */
+    char_u *
+eval_soundfold(char_u *word)
+{
+    langp_T	*lp;
+    char_u	sound[MAXWLEN];
+    int		lpi;
+
+    if (curwin->w_p_spell && *curwin->w_s->b_p_spl != NUL)
+	// Use the sound-folding of the first language that supports it.
+	for (lpi = 0; lpi < curwin->w_s->b_langp.ga_len; ++lpi)
+	{
+	    lp = LANGP_ENTRY(curwin->w_s->b_langp, lpi);
+	    if (lp->lp_slang->sl_sal.ga_len > 0)
+	    {
+		// soundfold the word
+		spell_soundfold(lp->lp_slang, word, FALSE, sound);
+		return vim_strsave(sound);
+	    }
+	}
+
+    // No language with sound folding, return word as-is.
+    return vim_strsave(word);
+}
+#endif
+
+/*
+ * Turn "inword" into its sound-a-like equivalent in "res[MAXWLEN]".
+ *
+ * There are many ways to turn a word into a sound-a-like representation.  The
+ * oldest is Soundex (1918!).   A nice overview can be found in "Approximate
+ * swedish name matching - survey and test of different algorithms" by Klas
+ * Erikson.
+ *
+ * We support two methods:
+ * 1. SOFOFROM/SOFOTO do a simple character mapping.
+ * 2. SAL items define a more advanced sound-folding (and much slower).
+ */
+    void
+spell_soundfold(
+    slang_T	*slang,
+    char_u	*inword,
+    int		folded,	    // "inword" is already case-folded
+    char_u	*res)
+{
+    char_u	fword[MAXWLEN];
+    char_u	*word;
+
+    if (slang->sl_sofo)
+	// SOFOFROM and SOFOTO used
+	spell_soundfold_sofo(slang, inword, res);
+    else
+    {
+	// SAL items used.  Requires the word to be case-folded.
+	if (folded)
+	    word = inword;
+	else
+	{
+	    (void)spell_casefold(curwin,
+				  inword, (int)STRLEN(inword), fword, MAXWLEN);
+	    word = fword;
+	}
+
+	if (has_mbyte)
+	    spell_soundfold_wsal(slang, word, res);
+	else
+	    spell_soundfold_sal(slang, word, res);
+    }
+}
+
+/*
+ * Perform sound folding of "inword" into "res" according to SOFOFROM and
+ * SOFOTO lines.
+ */
+    static void
+spell_soundfold_sofo(slang_T *slang, char_u *inword, char_u *res)
+{
+    char_u	*s;
+    int		ri = 0;
+    int		c;
+
+    if (has_mbyte)
+    {
+	int	prevc = 0;
+	int	*ip;
+
+	// The sl_sal_first[] table contains the translation for chars up to
+	// 255, sl_sal the rest.
+	for (s = inword; *s != NUL; )
+	{
+	    c = mb_cptr2char_adv(&s);
+	    if (enc_utf8 ? utf_class(c) == 0 : VIM_ISWHITE(c))
+		c = ' ';
+	    else if (c < 256)
+		c = slang->sl_sal_first[c];
+	    else
+	    {
+		ip = ((int **)slang->sl_sal.ga_data)[c & 0xff];
+		if (ip == NULL)		// empty list, can't match
+		    c = NUL;
+		else
+		    for (;;)		// find "c" in the list
+		    {
+			if (*ip == 0)	// not found
+			{
+			    c = NUL;
+			    break;
+			}
+			if (*ip == c)	// match!
+			{
+			    c = ip[1];
+			    break;
+			}
+			ip += 2;
+		    }
+	    }
+
+	    if (c != NUL && c != prevc)
+	    {
+		ri += mb_char2bytes(c, res + ri);
+		if (ri + MB_MAXBYTES > MAXWLEN)
+		    break;
+		prevc = c;
+	    }
+	}
+    }
+    else
+    {
+	// The sl_sal_first[] table contains the translation.
+	for (s = inword; (c = *s) != NUL; ++s)
+	{
+	    if (VIM_ISWHITE(c))
+		c = ' ';
+	    else
+		c = slang->sl_sal_first[c];
+	    if (c != NUL && (ri == 0 || res[ri - 1] != c))
+		res[ri++] = c;
+	}
+    }
+
+    res[ri] = NUL;
+}
+
+    static void
+spell_soundfold_sal(slang_T *slang, char_u *inword, char_u *res)
+{
+    salitem_T	*smp;
+    char_u	word[MAXWLEN];
+    char_u	*s = inword;
+    char_u	*t;
+    char_u	*pf;
+    int		i, j, z;
+    int		reslen;
+    int		n, k = 0;
+    int		z0;
+    int		k0;
+    int		n0;
+    int		c;
+    int		pri;
+    int		p0 = -333;
+    int		c0;
+
+    // Remove accents, if wanted.  We actually remove all non-word characters.
+    // But keep white space.  We need a copy, the word may be changed here.
+    if (slang->sl_rem_accents)
+    {
+	t = word;
+	while (*s != NUL)
+	{
+	    if (VIM_ISWHITE(*s))
+	    {
+		*t++ = ' ';
+		s = skipwhite(s);
+	    }
+	    else
+	    {
+		if (spell_iswordp_nmw(s, curwin))
+		    *t++ = *s;
+		++s;
+	    }
+	}
+	*t = NUL;
+    }
+    else
+	vim_strncpy(word, s, MAXWLEN - 1);
+
+    smp = (salitem_T *)slang->sl_sal.ga_data;
+
+    /*
+     * This comes from Aspell phonet.cpp.  Converted from C++ to C.
+     * Changed to keep spaces.
+     */
+    i = reslen = z = 0;
+    while ((c = word[i]) != NUL)
+    {
+	// Start with the first rule that has the character in the word.
+	n = slang->sl_sal_first[c];
+	z0 = 0;
+
+	if (n >= 0)
+	{
+	    // check all rules for the same letter
+	    for (; (s = smp[n].sm_lead)[0] == c; ++n)
+	    {
+		// Quickly skip entries that don't match the word.  Most
+		// entries are less than three chars, optimize for that.
+		k = smp[n].sm_leadlen;
+		if (k > 1)
+		{
+		    if (word[i + 1] != s[1])
+			continue;
+		    if (k > 2)
+		    {
+			for (j = 2; j < k; ++j)
+			    if (word[i + j] != s[j])
+				break;
+			if (j < k)
+			    continue;
+		    }
+		}
+
+		if ((pf = smp[n].sm_oneof) != NULL)
+		{
+		    // Check for match with one of the chars in "sm_oneof".
+		    while (*pf != NUL && *pf != word[i + k])
+			++pf;
+		    if (*pf == NUL)
+			continue;
+		    ++k;
+		}
+		s = smp[n].sm_rules;
+		pri = 5;    // default priority
+
+		p0 = *s;
+		k0 = k;
+		while (*s == '-' && k > 1)
+		{
+		    k--;
+		    s++;
+		}
+		if (*s == '<')
+		    s++;
+		if (VIM_ISDIGIT(*s))
+		{
+		    // determine priority
+		    pri = *s - '0';
+		    s++;
+		}
+		if (*s == '^' && *(s + 1) == '^')
+		    s++;
+
+		if (*s == NUL
+			|| (*s == '^'
+			    && (i == 0 || !(word[i - 1] == ' '
+				      || spell_iswordp(word + i - 1, curwin)))
+			    && (*(s + 1) != '$'
+				|| (!spell_iswordp(word + i + k0, curwin))))
+			|| (*s == '$' && i > 0
+			    && spell_iswordp(word + i - 1, curwin)
+			    && (!spell_iswordp(word + i + k0, curwin))))
+		{
+		    // search for followup rules, if:
+		    // followup and k > 1  and  NO '-' in searchstring
+		    c0 = word[i + k - 1];
+		    n0 = slang->sl_sal_first[c0];
+
+		    if (slang->sl_followup && k > 1 && n0 >= 0
+					   && p0 != '-' && word[i + k] != NUL)
+		    {
+			// test follow-up rule for "word[i + k]"
+			for ( ; (s = smp[n0].sm_lead)[0] == c0; ++n0)
+			{
+			    // Quickly skip entries that don't match the word.
+			    //
+			    k0 = smp[n0].sm_leadlen;
+			    if (k0 > 1)
+			    {
+				if (word[i + k] != s[1])
+				    continue;
+				if (k0 > 2)
+				{
+				    pf = word + i + k + 1;
+				    for (j = 2; j < k0; ++j)
+					if (*pf++ != s[j])
+					    break;
+				    if (j < k0)
+					continue;
+				}
+			    }
+			    k0 += k - 1;
+
+			    if ((pf = smp[n0].sm_oneof) != NULL)
+			    {
+				// Check for match with one of the chars in
+				// "sm_oneof".
+				while (*pf != NUL && *pf != word[i + k0])
+				    ++pf;
+				if (*pf == NUL)
+				    continue;
+				++k0;
+			    }
+
+			    p0 = 5;
+			    s = smp[n0].sm_rules;
+			    while (*s == '-')
+			    {
+				// "k0" gets NOT reduced because
+				// "if (k0 == k)"
+				s++;
+			    }
+			    if (*s == '<')
+				s++;
+			    if (VIM_ISDIGIT(*s))
+			    {
+				p0 = *s - '0';
+				s++;
+			    }
+
+			    if (*s == NUL
+				    // *s == '^' cuts
+				    || (*s == '$'
+					    && !spell_iswordp(word + i + k0,
+								     curwin)))
+			    {
+				if (k0 == k)
+				    // this is just a piece of the string
+				    continue;
+
+				if (p0 < pri)
+				    // priority too low
+				    continue;
+				// rule fits; stop search
+				break;
+			    }
+			}
+
+			if (p0 >= pri && smp[n0].sm_lead[0] == c0)
+			    continue;
+		    }
+
+		    // replace string
+		    s = smp[n].sm_to;
+		    if (s == NULL)
+			s = (char_u *)"";
+		    pf = smp[n].sm_rules;
+		    p0 = (vim_strchr(pf, '<') != NULL) ? 1 : 0;
+		    if (p0 == 1 && z == 0)
+		    {
+			// rule with '<' is used
+			if (reslen > 0 && *s != NUL && (res[reslen - 1] == c
+						    || res[reslen - 1] == *s))
+			    reslen--;
+			z0 = 1;
+			z = 1;
+			k0 = 0;
+			while (*s != NUL && word[i + k0] != NUL)
+			{
+			    word[i + k0] = *s;
+			    k0++;
+			    s++;
+			}
+			if (k > k0)
+			    STRMOVE(word + i + k0, word + i + k);
+
+			// new "actual letter"
+			c = word[i];
+		    }
+		    else
+		    {
+			// no '<' rule used
+			i += k - 1;
+			z = 0;
+			while (*s != NUL && s[1] != NUL && reslen < MAXWLEN)
+			{
+			    if (reslen == 0 || res[reslen - 1] != *s)
+				res[reslen++] = *s;
+			    s++;
+			}
+			// new "actual letter"
+			c = *s;
+			if (strstr((char *)pf, "^^") != NULL)
+			{
+			    if (c != NUL)
+				res[reslen++] = c;
+			    STRMOVE(word, word + i + 1);
+			    i = 0;
+			    z0 = 1;
+			}
+		    }
+		    break;
+		}
+	    }
+	}
+	else if (VIM_ISWHITE(c))
+	{
+	    c = ' ';
+	    k = 1;
+	}
+
+	if (z0 == 0)
+	{
+	    if (k && !p0 && reslen < MAXWLEN && c != NUL
+		    && (!slang->sl_collapse || reslen == 0
+						     || res[reslen - 1] != c))
+		// condense only double letters
+		res[reslen++] = c;
+
+	    i++;
+	    z = 0;
+	    k = 0;
+	}
+    }
+
+    res[reslen] = NUL;
+}
+
+/*
+ * Turn "inword" into its sound-a-like equivalent in "res[MAXWLEN]".
+ * Multi-byte version of spell_soundfold().
+ */
+    static void
+spell_soundfold_wsal(slang_T *slang, char_u *inword, char_u *res)
+{
+    salitem_T	*smp = (salitem_T *)slang->sl_sal.ga_data;
+    int		word[MAXWLEN];
+    int		wres[MAXWLEN];
+    int		l;
+    char_u	*s;
+    int		*ws;
+    char_u	*t;
+    int		*pf;
+    int		i, j, z;
+    int		reslen;
+    int		n, k = 0;
+    int		z0;
+    int		k0;
+    int		n0;
+    int		c;
+    int		pri;
+    int		p0 = -333;
+    int		c0;
+    int		did_white = FALSE;
+    int		wordlen;
+
+
+    /*
+     * Convert the multi-byte string to a wide-character string.
+     * Remove accents, if wanted.  We actually remove all non-word characters.
+     * But keep white space.
+     */
+    wordlen = 0;
+    for (s = inword; *s != NUL; )
+    {
+	t = s;
+	c = mb_cptr2char_adv(&s);
+	if (slang->sl_rem_accents)
+	{
+	    if (enc_utf8 ? utf_class(c) == 0 : VIM_ISWHITE(c))
+	    {
+		if (did_white)
+		    continue;
+		c = ' ';
+		did_white = TRUE;
+	    }
+	    else
+	    {
+		did_white = FALSE;
+		if (!spell_iswordp_nmw(t, curwin))
+		    continue;
+	    }
+	}
+	word[wordlen++] = c;
+    }
+    word[wordlen] = NUL;
+
+    /*
+     * This algorithm comes from Aspell phonet.cpp.
+     * Converted from C++ to C.  Added support for multi-byte chars.
+     * Changed to keep spaces.
+     */
+    i = reslen = z = 0;
+    while ((c = word[i]) != NUL)
+    {
+	// Start with the first rule that has the character in the word.
+	n = slang->sl_sal_first[c & 0xff];
+	z0 = 0;
+
+	if (n >= 0)
+	{
+	    // Check all rules for the same index byte.
+	    // If c is 0x300 need extra check for the end of the array, as
+	    // (c & 0xff) is NUL.
+	    for (; ((ws = smp[n].sm_lead_w)[0] & 0xff) == (c & 0xff)
+							 && ws[0] != NUL; ++n)
+	    {
+		// Quickly skip entries that don't match the word.  Most
+		// entries are less than three chars, optimize for that.
+		if (c != ws[0])
+		    continue;
+		k = smp[n].sm_leadlen;
+		if (k > 1)
+		{
+		    if (word[i + 1] != ws[1])
+			continue;
+		    if (k > 2)
+		    {
+			for (j = 2; j < k; ++j)
+			    if (word[i + j] != ws[j])
+				break;
+			if (j < k)
+			    continue;
+		    }
+		}
+
+		if ((pf = smp[n].sm_oneof_w) != NULL)
+		{
+		    // Check for match with one of the chars in "sm_oneof".
+		    while (*pf != NUL && *pf != word[i + k])
+			++pf;
+		    if (*pf == NUL)
+			continue;
+		    ++k;
+		}
+		s = smp[n].sm_rules;
+		pri = 5;    // default priority
+
+		p0 = *s;
+		k0 = k;
+		while (*s == '-' && k > 1)
+		{
+		    k--;
+		    s++;
+		}
+		if (*s == '<')
+		    s++;
+		if (VIM_ISDIGIT(*s))
+		{
+		    // determine priority
+		    pri = *s - '0';
+		    s++;
+		}
+		if (*s == '^' && *(s + 1) == '^')
+		    s++;
+
+		if (*s == NUL
+			|| (*s == '^'
+			    && (i == 0 || !(word[i - 1] == ' '
+				    || spell_iswordp_w(word + i - 1, curwin)))
+			    && (*(s + 1) != '$'
+				|| (!spell_iswordp_w(word + i + k0, curwin))))
+			|| (*s == '$' && i > 0
+			    && spell_iswordp_w(word + i - 1, curwin)
+			    && (!spell_iswordp_w(word + i + k0, curwin))))
+		{
+		    // search for followup rules, if:
+		    // followup and k > 1  and  NO '-' in searchstring
+		    c0 = word[i + k - 1];
+		    n0 = slang->sl_sal_first[c0 & 0xff];
+
+		    if (slang->sl_followup && k > 1 && n0 >= 0
+					   && p0 != '-' && word[i + k] != NUL)
+		    {
+			// Test follow-up rule for "word[i + k]"; loop over
+			// all entries with the same index byte.
+			for ( ; ((ws = smp[n0].sm_lead_w)[0] & 0xff)
+							 == (c0 & 0xff); ++n0)
+			{
+			    // Quickly skip entries that don't match the word.
+			    if (c0 != ws[0])
+				continue;
+			    k0 = smp[n0].sm_leadlen;
+			    if (k0 > 1)
+			    {
+				if (word[i + k] != ws[1])
+				    continue;
+				if (k0 > 2)
+				{
+				    pf = word + i + k + 1;
+				    for (j = 2; j < k0; ++j)
+					if (*pf++ != ws[j])
+					    break;
+				    if (j < k0)
+					continue;
+				}
+			    }
+			    k0 += k - 1;
+
+			    if ((pf = smp[n0].sm_oneof_w) != NULL)
+			    {
+				// Check for match with one of the chars in
+				// "sm_oneof".
+				while (*pf != NUL && *pf != word[i + k0])
+				    ++pf;
+				if (*pf == NUL)
+				    continue;
+				++k0;
+			    }
+
+			    p0 = 5;
+			    s = smp[n0].sm_rules;
+			    while (*s == '-')
+			    {
+				// "k0" gets NOT reduced because
+				// "if (k0 == k)"
+				s++;
+			    }
+			    if (*s == '<')
+				s++;
+			    if (VIM_ISDIGIT(*s))
+			    {
+				p0 = *s - '0';
+				s++;
+			    }
+
+			    if (*s == NUL
+				    // *s == '^' cuts
+				    || (*s == '$'
+					 && !spell_iswordp_w(word + i + k0,
+								     curwin)))
+			    {
+				if (k0 == k)
+				    // this is just a piece of the string
+				    continue;
+
+				if (p0 < pri)
+				    // priority too low
+				    continue;
+				// rule fits; stop search
+				break;
+			    }
+			}
+
+			if (p0 >= pri && (smp[n0].sm_lead_w[0] & 0xff)
+							       == (c0 & 0xff))
+			    continue;
+		    }
+
+		    // replace string
+		    ws = smp[n].sm_to_w;
+		    s = smp[n].sm_rules;
+		    p0 = (vim_strchr(s, '<') != NULL) ? 1 : 0;
+		    if (p0 == 1 && z == 0)
+		    {
+			// rule with '<' is used
+			if (reslen > 0 && ws != NULL && *ws != NUL
+				&& (wres[reslen - 1] == c
+						    || wres[reslen - 1] == *ws))
+			    reslen--;
+			z0 = 1;
+			z = 1;
+			k0 = 0;
+			if (ws != NULL)
+			    while (*ws != NUL && word[i + k0] != NUL)
+			    {
+				word[i + k0] = *ws;
+				k0++;
+				ws++;
+			    }
+			if (k > k0)
+			    mch_memmove(word + i + k0, word + i + k,
+				    sizeof(int) * (wordlen - (i + k) + 1));
+
+			// new "actual letter"
+			c = word[i];
+		    }
+		    else
+		    {
+			// no '<' rule used
+			i += k - 1;
+			z = 0;
+			if (ws != NULL)
+			    while (*ws != NUL && ws[1] != NUL
+							  && reslen < MAXWLEN)
+			    {
+				if (reslen == 0 || wres[reslen - 1] != *ws)
+				    wres[reslen++] = *ws;
+				ws++;
+			    }
+			// new "actual letter"
+			if (ws == NULL)
+			    c = NUL;
+			else
+			    c = *ws;
+			if (strstr((char *)s, "^^") != NULL)
+			{
+			    if (c != NUL)
+				wres[reslen++] = c;
+			    mch_memmove(word, word + i + 1,
+				       sizeof(int) * (wordlen - (i + 1) + 1));
+			    i = 0;
+			    z0 = 1;
+			}
+		    }
+		    break;
+		}
+	    }
+	}
+	else if (VIM_ISWHITE(c))
+	{
+	    c = ' ';
+	    k = 1;
+	}
+
+	if (z0 == 0)
+	{
+	    if (k && !p0 && reslen < MAXWLEN && c != NUL
+		    && (!slang->sl_collapse || reslen == 0
+						     || wres[reslen - 1] != c))
+		// condense only double letters
+		wres[reslen++] = c;
+
+	    i++;
+	    z = 0;
+	    k = 0;
+	}
+    }
+
+    // Convert wide characters in "wres" to a multi-byte string in "res".
+    l = 0;
+    for (n = 0; n < reslen; ++n)
+    {
+	l += mb_char2bytes(wres[n], res + l);
+	if (l + MB_MAXBYTES > MAXWLEN)
+	    break;
+    }
+    res[l] = NUL;
+}
+
+/*
+ * ":spellinfo"
+ */
+    void
+ex_spellinfo(exarg_T *eap UNUSED)
+{
+    int		lpi;
+    langp_T	*lp;
+    char_u	*p;
+
+    if (no_spell_checking(curwin))
+	return;
+
+    msg_start();
+    for (lpi = 0; lpi < curwin->w_s->b_langp.ga_len && !got_int; ++lpi)
+    {
+	lp = LANGP_ENTRY(curwin->w_s->b_langp, lpi);
+	msg_puts("file: ");
+	msg_puts((char *)lp->lp_slang->sl_fname);
+	msg_putchar('\n');
+	p = lp->lp_slang->sl_info;
+	if (p != NULL)
+	{
+	    msg_puts((char *)p);
+	    msg_putchar('\n');
+	}
+    }
+    msg_end();
+}
+
+#define DUMPFLAG_KEEPCASE   1	// round 2: keep-case tree
+#define DUMPFLAG_COUNT	    2	// include word count
+#define DUMPFLAG_ICASE	    4	// ignore case when finding matches
+#define DUMPFLAG_ONECAP	    8	// pattern starts with capital
+#define DUMPFLAG_ALLCAP	    16	// pattern is all capitals
+
+/*
+ * ":spelldump"
+ */
+    void
+ex_spelldump(exarg_T *eap)
+{
+    char_u  *spl;
+    long    dummy;
+
+    if (no_spell_checking(curwin))
+	return;
+    (void)get_option_value((char_u*)"spl", &dummy, &spl, NULL, OPT_LOCAL);
+
+    // Create a new empty buffer in a new window.
+    do_cmdline_cmd((char_u *)"new");
+
+    // enable spelling locally in the new window
+    set_option_value_give_err((char_u*)"spell", TRUE, (char_u*)"", OPT_LOCAL);
+    set_option_value_give_err((char_u*)"spl",  dummy, spl, OPT_LOCAL);
+    vim_free(spl);
+
+    if (!BUFEMPTY())
+	return;
+
+    spell_dump_compl(NULL, 0, NULL, eap->forceit ? DUMPFLAG_COUNT : 0);
+
+    // Delete the empty line that we started with.
+    if (curbuf->b_ml.ml_line_count > 1)
+	ml_delete(curbuf->b_ml.ml_line_count);
+
+    redraw_later(UPD_NOT_VALID);
+}
+
+/*
+ * Go through all possible words and:
+ * 1. When "pat" is NULL: dump a list of all words in the current buffer.
+ *	"ic" and "dir" are not used.
+ * 2. When "pat" is not NULL: add matching words to insert mode completion.
+ */
+    void
+spell_dump_compl(
+    char_u	*pat,	    // leading part of the word
+    int		ic,	    // ignore case
+    int		*dir,	    // direction for adding matches
+    int		dumpflags_arg)	// DUMPFLAG_*
+{
+    langp_T	*lp;
+    slang_T	*slang;
+    idx_T	arridx[MAXWLEN];
+    int		curi[MAXWLEN];
+    char_u	word[MAXWLEN];
+    int		c;
+    char_u	*byts;
+    idx_T	*idxs;
+    linenr_T	lnum = 0;
+    int		round;
+    int		depth;
+    int		n;
+    int		flags;
+    char_u	*region_names = NULL;	    // region names being used
+    int		do_region = TRUE;	    // dump region names and numbers
+    char_u	*p;
+    int		lpi;
+    int		dumpflags = dumpflags_arg;
+    int		patlen;
+
+    // When ignoring case or when the pattern starts with capital pass this on
+    // to dump_word().
+    if (pat != NULL)
+    {
+	if (ic)
+	    dumpflags |= DUMPFLAG_ICASE;
+	else
+	{
+	    n = captype(pat, NULL);
+	    if (n == WF_ONECAP)
+		dumpflags |= DUMPFLAG_ONECAP;
+	    else if (n == WF_ALLCAP && (int)STRLEN(pat) > mb_ptr2len(pat))
+		dumpflags |= DUMPFLAG_ALLCAP;
+	}
+    }
+
+    // Find out if we can support regions: All languages must support the same
+    // regions or none at all.
+    for (lpi = 0; lpi < curwin->w_s->b_langp.ga_len; ++lpi)
+    {
+	lp = LANGP_ENTRY(curwin->w_s->b_langp, lpi);
+	p = lp->lp_slang->sl_regions;
+	if (p[0] != 0)
+	{
+	    if (region_names == NULL)	    // first language with regions
+		region_names = p;
+	    else if (STRCMP(region_names, p) != 0)
+	    {
+		do_region = FALSE;	    // region names are different
+		break;
+	    }
+	}
+    }
+
+    if (do_region && region_names != NULL && pat == NULL)
+    {
+	vim_snprintf((char *)IObuff, IOSIZE, "/regions=%s", region_names);
+	ml_append(lnum++, IObuff, (colnr_T)0, FALSE);
+    }
+    else
+	do_region = FALSE;
+
+    /*
+     * Loop over all files loaded for the entries in 'spelllang'.
+     */
+    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_fbyts == NULL)	    // reloading failed
+	    continue;
+
+	if (pat == NULL)
+	{
+	    vim_snprintf((char *)IObuff, IOSIZE, "# file: %s", slang->sl_fname);
+	    ml_append(lnum++, IObuff, (colnr_T)0, FALSE);
+	}
+
+	// When matching with a pattern and there are no prefixes only use
+	// parts of the tree that match "pat".
+	if (pat != NULL && slang->sl_pbyts == NULL)
+	    patlen = (int)STRLEN(pat);
+	else
+	    patlen = -1;
+
+	// round 1: case-folded tree
+	// round 2: keep-case tree
+	for (round = 1; round <= 2; ++round)
+	{
+	    if (round == 1)
+	    {
+		dumpflags &= ~DUMPFLAG_KEEPCASE;
+		byts = slang->sl_fbyts;
+		idxs = slang->sl_fidxs;
+	    }
+	    else
+	    {
+		dumpflags |= DUMPFLAG_KEEPCASE;
+		byts = slang->sl_kbyts;
+		idxs = slang->sl_kidxs;
+	    }
+	    if (byts == NULL)
+		continue;		// array is empty
+
+	    depth = 0;
+	    arridx[0] = 0;
+	    curi[0] = 1;
+	    while (depth >= 0 && !got_int
+				  && (pat == NULL || !ins_compl_interrupted()))
+	    {
+		if (curi[depth] > byts[arridx[depth]])
+		{
+		    // Done all bytes at this node, go up one level.
+		    --depth;
+		    line_breakcheck();
+		    ins_compl_check_keys(50, FALSE);
+		}
+		else
+		{
+		    // Do one more byte at this node.
+		    n = arridx[depth] + curi[depth];
+		    ++curi[depth];
+		    c = byts[n];
+		    if (c == 0 || depth >= MAXWLEN - 1)
+		    {
+			// End of word or reached maximum length, deal with the
+			// word.
+			// Don't use keep-case words in the fold-case tree,
+			// they will appear in the keep-case tree.
+			// Only use the word when the region matches.
+			flags = (int)idxs[n];
+			if ((round == 2 || (flags & WF_KEEPCAP) == 0)
+				&& (flags & WF_NEEDCOMP) == 0
+				&& (do_region
+				    || (flags & WF_REGION) == 0
+				    || (((unsigned)flags >> 16)
+						       & lp->lp_region) != 0))
+			{
+			    word[depth] = NUL;
+			    if (!do_region)
+				flags &= ~WF_REGION;
+
+			    // Dump the basic word if there is no prefix or
+			    // when it's the first one.
+			    c = (unsigned)flags >> 24;
+			    if (c == 0 || curi[depth] == 2)
+			    {
+				dump_word(slang, word, pat, dir,
+						      dumpflags, flags, lnum);
+				if (pat == NULL)
+				    ++lnum;
+			    }
+
+			    // Apply the prefix, if there is one.
+			    if (c != 0)
+				lnum = dump_prefixes(slang, word, pat, dir,
+						      dumpflags, flags, lnum);
+			}
+		    }
+		    else
+		    {
+			// Normal char, go one level deeper.
+			word[depth++] = c;
+			arridx[depth] = idxs[n];
+			curi[depth] = 1;
+
+			// Check if this character matches with the pattern.
+			// If not skip the whole tree below it.
+			// Always ignore case here, dump_word() will check
+			// proper case later.  This isn't exactly right when
+			// length changes for multi-byte characters with
+			// ignore case...
+			if (depth <= patlen
+					&& MB_STRNICMP(word, pat, depth) != 0)
+			    --depth;
+		    }
+		}
+	    }
+	}
+    }
+}
+
+/*
+ * Dump one word: apply case modifications and append a line to the buffer.
+ * When "lnum" is zero add insert mode completion.
+ */
+    static void
+dump_word(
+    slang_T	*slang,
+    char_u	*word,
+    char_u	*pat,
+    int		*dir,
+    int		dumpflags,
+    int		wordflags,
+    linenr_T	lnum)
+{
+    int		keepcap = FALSE;
+    char_u	*p;
+    char_u	*tw;
+    char_u	cword[MAXWLEN];
+    char_u	badword[MAXWLEN + 10];
+    int		i;
+    int		flags = wordflags;
+
+    if (dumpflags & DUMPFLAG_ONECAP)
+	flags |= WF_ONECAP;
+    if (dumpflags & DUMPFLAG_ALLCAP)
+	flags |= WF_ALLCAP;
+
+    if ((dumpflags & DUMPFLAG_KEEPCASE) == 0 && (flags & WF_CAPMASK) != 0)
+    {
+	// Need to fix case according to "flags".
+	make_case_word(word, cword, flags);
+	p = cword;
+    }
+    else
+    {
+	p = word;
+	if ((dumpflags & DUMPFLAG_KEEPCASE)
+		&& ((captype(word, NULL) & WF_KEEPCAP) == 0
+						 || (flags & WF_FIXCAP) != 0))
+	    keepcap = TRUE;
+    }
+    tw = p;
+
+    if (pat == NULL)
+    {
+	// Add flags and regions after a slash.
+	if ((flags & (WF_BANNED | WF_RARE | WF_REGION)) || keepcap)
+	{
+	    STRCPY(badword, p);
+	    STRCAT(badword, "/");
+	    if (keepcap)
+		STRCAT(badword, "=");
+	    if (flags & WF_BANNED)
+		STRCAT(badword, "!");
+	    else if (flags & WF_RARE)
+		STRCAT(badword, "?");
+	    if (flags & WF_REGION)
+		for (i = 0; i < 7; ++i)
+		    if (flags & (0x10000 << i))
+			sprintf((char *)badword + STRLEN(badword), "%d", i + 1);
+	    p = badword;
+	}
+
+	if (dumpflags & DUMPFLAG_COUNT)
+	{
+	    hashitem_T  *hi;
+
+	    // Include the word count for ":spelldump!".
+	    hi = hash_find(&slang->sl_wordcount, tw);
+	    if (!HASHITEM_EMPTY(hi))
+	    {
+		vim_snprintf((char *)IObuff, IOSIZE, "%s\t%d",
+						     tw, HI2WC(hi)->wc_count);
+		p = IObuff;
+	    }
+	}
+
+	ml_append(lnum, p, (colnr_T)0, FALSE);
+    }
+    else if (((dumpflags & DUMPFLAG_ICASE)
+		    ? MB_STRNICMP(p, pat, STRLEN(pat)) == 0
+		    : STRNCMP(p, pat, STRLEN(pat)) == 0)
+		&& ins_compl_add_infercase(p, (int)STRLEN(p),
+					  p_ic, NULL, *dir, FALSE) == OK)
+	// if dir was BACKWARD then honor it just once
+	*dir = FORWARD;
+}
+
+/*
+ * For ":spelldump": Find matching prefixes for "word".  Prepend each to
+ * "word" and append a line to the buffer.
+ * When "lnum" is zero add insert mode completion.
+ * Return the updated line number.
+ */
+    static linenr_T
+dump_prefixes(
+    slang_T	*slang,
+    char_u	*word,	    // case-folded word
+    char_u	*pat,
+    int		*dir,
+    int		dumpflags,
+    int		flags,	    // flags with prefix ID
+    linenr_T	startlnum)
+{
+    idx_T	arridx[MAXWLEN];
+    int		curi[MAXWLEN];
+    char_u	prefix[MAXWLEN];
+    char_u	word_up[MAXWLEN];
+    int		has_word_up = FALSE;
+    int		c;
+    char_u	*byts;
+    idx_T	*idxs;
+    linenr_T	lnum = startlnum;
+    int		depth;
+    int		n;
+    int		len;
+    int		i;
+
+    // If the word starts with a lower-case letter make the word with an
+    // upper-case letter in word_up[].
+    c = PTR2CHAR(word);
+    if (SPELL_TOUPPER(c) != c)
+    {
+	onecap_copy(word, word_up, TRUE);
+	has_word_up = TRUE;
+    }
+
+    byts = slang->sl_pbyts;
+    idxs = slang->sl_pidxs;
+    if (byts != NULL)		// array not is empty
+    {
+	/*
+	 * Loop over all prefixes, building them byte-by-byte in prefix[].
+	 * When at the end of a prefix check that it supports "flags".
+	 */
+	depth = 0;
+	arridx[0] = 0;
+	curi[0] = 1;
+	while (depth >= 0 && !got_int)
+	{
+	    n = arridx[depth];
+	    len = byts[n];
+	    if (curi[depth] > len)
+	    {
+		// Done all bytes at this node, go up one level.
+		--depth;
+		line_breakcheck();
+	    }
+	    else
+	    {
+		// Do one more byte at this node.
+		n += curi[depth];
+		++curi[depth];
+		c = byts[n];
+		if (c == 0)
+		{
+		    // End of prefix, find out how many IDs there are.
+		    for (i = 1; i < len; ++i)
+			if (byts[n + i] != 0)
+			    break;
+		    curi[depth] += i - 1;
+
+		    c = valid_word_prefix(i, n, flags, word, slang, FALSE);
+		    if (c != 0)
+		    {
+			vim_strncpy(prefix + depth, word, MAXWLEN - depth - 1);
+			dump_word(slang, prefix, pat, dir, dumpflags,
+				(c & WF_RAREPFX) ? (flags | WF_RARE)
+							       : flags, lnum);
+			if (lnum != 0)
+			    ++lnum;
+		    }
+
+		    // Check for prefix that matches the word when the
+		    // first letter is upper-case, but only if the prefix has
+		    // a condition.
+		    if (has_word_up)
+		    {
+			c = valid_word_prefix(i, n, flags, word_up, slang,
+									TRUE);
+			if (c != 0)
+			{
+			    vim_strncpy(prefix + depth, word_up,
+							 MAXWLEN - depth - 1);
+			    dump_word(slang, prefix, pat, dir, dumpflags,
+				    (c & WF_RAREPFX) ? (flags | WF_RARE)
+							       : flags, lnum);
+			    if (lnum != 0)
+				++lnum;
+			}
+		    }
+		}
+		else
+		{
+		    // Normal char, go one level deeper.
+		    prefix[depth++] = c;
+		    arridx[depth] = idxs[n];
+		    curi[depth] = 1;
+		}
+	    }
+	}
+    }
+
+    return lnum;
+}
+
+/*
+ * Move "p" to the end of word "start".
+ * Uses the spell-checking word characters.
+ */
+    char_u *
+spell_to_word_end(char_u *start, win_T *win)
+{
+    char_u  *p = start;
+
+    while (*p != NUL && spell_iswordp(p, win))
+	MB_PTR_ADV(p);
+    return p;
+}
+
+/*
+ * For Insert mode completion CTRL-X s:
+ * Find start of the word in front of column "startcol".
+ * We don't check if it is badly spelled, with completion we can only change
+ * the word in front of the cursor.
+ * Returns the column number of the word.
+ */
+    int
+spell_word_start(int startcol)
+{
+    char_u	*line;
+    char_u	*p;
+    int		col = 0;
+
+    if (no_spell_checking(curwin))
+	return startcol;
+
+    // Find a word character before "startcol".
+    line = ml_get_curline();
+    for (p = line + startcol; p > line; )
+    {
+	MB_PTR_BACK(line, p);
+	if (spell_iswordp_nmw(p, curwin))
+	    break;
+    }
+
+    // Go back to start of the word.
+    while (p > line)
+    {
+	col = (int)(p - line);
+	MB_PTR_BACK(line, p);
+	if (!spell_iswordp(p, curwin))
+	    break;
+	col = 0;
+    }
+
+    return col;
+}
+
+/*
+ * Need to check for 'spellcapcheck' now, the word is removed before
+ * expand_spelling() is called.  Therefore the ugly global variable.
+ */
+static int spell_expand_need_cap;
+
+    void
+spell_expand_check_cap(colnr_T col)
+{
+    spell_expand_need_cap = check_need_cap(curwin, curwin->w_cursor.lnum, col);
+}
+
+/*
+ * Get list of spelling suggestions.
+ * Used for Insert mode completion CTRL-X ?.
+ * Returns the number of matches.  The matches are in "matchp[]", array of
+ * allocated strings.
+ */
+    int
+expand_spelling(
+    linenr_T	lnum UNUSED,
+    char_u	*pat,
+    char_u	***matchp)
+{
+    garray_T	ga;
+
+    spell_suggest_list(&ga, pat, 100, spell_expand_need_cap, TRUE);
+    *matchp = ga.ga_data;
+    return ga.ga_len;
+}
+
+/*
+ * Return TRUE if "val" is a valid 'spelllang' value.
+ */
+    int
+valid_spelllang(char_u *val)
+{
+    return valid_name(val, ".-_,@");
+}
+
+/*
+ * Return TRUE if "val" is a valid 'spellfile' value.
+ */
+    int
+valid_spellfile(char_u *val)
+{
+    char_u *s;
+
+    for (s = val; *s != NUL; ++s)
+	if (!vim_is_fname_char(*s))
+	    return FALSE;
+    return TRUE;
+}
+
+/*
+ * Handle side effects of setting 'spell' or 'spellfile'
+ * Return an error message or NULL for success.
+ */
+    char *
+did_set_spell_option(int is_spellfile)
+{
+    char    *errmsg = NULL;
+    win_T   *wp;
+    int	    l;
+
+    if (is_spellfile)
+    {
+	l = (int)STRLEN(curwin->w_s->b_p_spf);
+	if (l > 0 && (l < 4
+			|| STRCMP(curwin->w_s->b_p_spf + l - 4, ".add") != 0))
+	    errmsg = e_invalid_argument;
+    }
+
+    if (errmsg != NULL)
+	return errmsg;
+
+    FOR_ALL_WINDOWS(wp)
+	if (wp->w_buffer == curbuf && wp->w_p_spell)
+	{
+	    errmsg = parse_spelllang(wp);
+	    break;
+	}
+    return errmsg;
+}
+
+/*
+ * Set curbuf->b_cap_prog to the regexp program for 'spellcapcheck'.
+ * Return error message when failed, NULL when OK.
+ */
+    char *
+compile_cap_prog(synblock_T *synblock)
+{
+    regprog_T   *rp = synblock->b_cap_prog;
+    char_u	*re;
+
+    if (synblock->b_p_spc == NULL || *synblock->b_p_spc == NUL)
+	synblock->b_cap_prog = NULL;
+    else
+    {
+	// Prepend a ^ so that we only match at one column
+	re = concat_str((char_u *)"^", synblock->b_p_spc);
+	if (re != NULL)
+	{
+	    synblock->b_cap_prog = vim_regcomp(re, RE_MAGIC);
+	    vim_free(re);
+	    if (synblock->b_cap_prog == NULL)
+	    {
+		synblock->b_cap_prog = rp; // restore the previous program
+		return e_invalid_argument;
+	    }
+	}
+    }
+
+    vim_regfree(rp);
+    return NULL;
+}
+
+#endif  // FEAT_SPELL