diff --git a/src/spell.c b/src/spell.c
index e22d8c0..9220bc0 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -1026,12 +1026,12 @@
  * caller can skip over the word.
  */
     int
-spell_check(wp, ptr, attrp, capcol, docount)
-    win_T	*wp;		/* current window */
-    char_u	*ptr;
-    hlf_T	*attrp;
-    int		*capcol;	/* column to check for Capital */
-    int		docount;	/* count good words */
+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. */
@@ -1247,9 +1247,7 @@
  * For a match mip->mi_result is updated.
  */
     static void
-find_word(mip, mode)
-    matchinf_T	*mip;
-    int		mode;
+find_word(matchinf_T *mip, int mode)
 {
     idx_T	arridx = 0;
     int		endlen[MAXWLEN];    /* length at possible word endings */
@@ -1767,10 +1765,10 @@
  * end of ptr[wlen] and the second part matches after it.
  */
     static int
-match_checkcompoundpattern(ptr, wlen, gap)
-    char_u	*ptr;
-    int		wlen;
-    garray_T	*gap;  /* &sl_comppat */
+match_checkcompoundpattern(
+    char_u	*ptr,
+    int		wlen,
+    garray_T	*gap)  /* &sl_comppat */
 {
     int		i;
     char_u	*p;
@@ -1797,10 +1795,7 @@
  * does not have too many syllables.
  */
     static int
-can_compound(slang, word, flags)
-    slang_T	*slang;
-    char_u	*word;
-    char_u	*flags;
+can_compound(slang_T *slang, char_u *word, char_u *flags)
 {
 #ifdef FEAT_MBYTE
     char_u	uflags[MAXWLEN * 2];
@@ -1841,11 +1836,11 @@
  * lines if they don't contain wildcards.
  */
     static int
-can_be_compound(sp, slang, compflags, flag)
-    trystate_T	*sp;
-    slang_T	*slang;
-    char_u	*compflags;
-    int		flag;
+can_be_compound(
+    trystate_T	*sp,
+    slang_T	*slang,
+    char_u	*compflags,
+    int		flag)
 {
     /* If the flag doesn't appear in sl_compstartflags or sl_compallflags
      * then it can't possibly compound. */
@@ -1878,9 +1873,7 @@
  * Caller must check that slang->sl_comprules is not NULL.
  */
     static int
-match_compoundrule(slang, compflags)
-    slang_T	*slang;
-    char_u	*compflags;
+match_compoundrule(slang_T *slang, char_u *compflags)
 {
     char_u	*p;
     int		i;
@@ -1933,13 +1926,13 @@
  * The WF_RAREPFX flag is included in the return value for a rare prefix.
  */
     static int
-valid_word_prefix(totprefcnt, arridx, flags, word, slang, cond_req)
-    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 */
+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;
@@ -1987,9 +1980,7 @@
  * For a match mip->mi_result is updated.
  */
     static void
-find_prefix(mip, mode)
-    matchinf_T	*mip;
-    int		mode;
+find_prefix(matchinf_T *mip, int mode)
 {
     idx_T	arridx = 0;
     int		len;
@@ -2110,8 +2101,7 @@
  * Return the length of the folded chars in bytes.
  */
     static int
-fold_more(mip)
-    matchinf_T	*mip;
+fold_more(matchinf_T *mip)
 {
     int		flen;
     char_u	*p;
@@ -2139,9 +2129,9 @@
  * case.
  */
     static int
-spell_valid_case(wordflags, treeflags)
-    int	    wordflags;	    /* flags for the checked word. */
-    int	    treeflags;	    /* flags for the word in the spell tree */
+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
@@ -2153,8 +2143,7 @@
  * Return TRUE if spell checking is not enabled.
  */
     static int
-no_spell_checking(wp)
-    win_T	*wp;
+no_spell_checking(win_T *wp)
 {
     if (!wp->w_p_spell || *wp->w_s->b_p_spl == NUL
 					 || wp->w_s->b_langp.ga_len == 0)
@@ -2174,12 +2163,12 @@
  * Return 0 if not found, length of the badly spelled word otherwise.
  */
     int
-spell_move_to(wp, dir, allwords, curline, attrp)
-    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
+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;
@@ -2421,10 +2410,7 @@
  * to skip those bytes if the word was OK.
  */
     void
-spell_cat_line(buf, line, maxlen)
-    char_u	*buf;
-    char_u	*line;
-    int		maxlen;
+spell_cat_line(char_u *buf, char_u *line, int maxlen)
 {
     char_u	*p;
     int		n;
@@ -2461,8 +2447,7 @@
  * "lang" must be the language without the region: e.g., "en".
  */
     static void
-spell_load_lang(lang)
-    char_u	*lang;
+spell_load_lang(char_u *lang)
 {
     char_u	fname_enc[85];
     int		r;
@@ -2543,7 +2528,7 @@
  * use "latin1" for "latin9".  And limit to 60 characters (just in case).
  */
     static char_u *
-spell_enc()
+spell_enc(void)
 {
 
 #ifdef FEAT_MBYTE
@@ -2558,8 +2543,7 @@
  * "fname[MAXPATHL]".
  */
     static void
-int_wordlist_spl(fname)
-    char_u	    *fname;
+int_wordlist_spl(char_u *fname)
 {
     vim_snprintf((char *)fname, MAXPATHL, SPL_FNAME_TMPL,
 						  int_wordlist, spell_enc());
@@ -2570,8 +2554,7 @@
  * Caller must fill "sl_next".
  */
     static slang_T *
-slang_alloc(lang)
-    char_u	*lang;
+slang_alloc(char_u *lang)
 {
     slang_T *lp;
 
@@ -2594,8 +2577,7 @@
  * Free the contents of an slang_T and the structure itself.
  */
     static void
-slang_free(lp)
-    slang_T	*lp;
+slang_free(slang_T *lp)
 {
     vim_free(lp->sl_name);
     vim_free(lp->sl_fname);
@@ -2607,8 +2589,7 @@
  * Clear an slang_T so that the file can be reloaded.
  */
     static void
-slang_clear(lp)
-    slang_T	*lp;
+slang_clear(slang_T *lp)
 {
     garray_T	*gap;
     fromto_T	*ftp;
@@ -2714,8 +2695,7 @@
  * Clear the info from the .sug file in "lp".
  */
     static void
-slang_clear_sug(lp)
-    slang_T	*lp;
+slang_clear_sug(slang_T *lp)
 {
     vim_free(lp->sl_sbyts);
     lp->sl_sbyts = NULL;
@@ -2732,9 +2712,7 @@
  * Invoked through do_in_runtimepath().
  */
     static void
-spell_load_cb(fname, cookie)
-    char_u	*fname;
-    void	*cookie;
+spell_load_cb(char_u *fname, void *cookie)
 {
     spelload_T	*slp = (spelload_T *)cookie;
     slang_T	*slang;
@@ -2767,11 +2745,11 @@
  * Returns the slang_T the spell file was loaded into.  NULL for error.
  */
     static slang_T *
-spell_load_file(fname, lang, old_lp, silent)
-    char_u	*fname;
-    char_u	*lang;
-    slang_T	*old_lp;
-    int		silent;		/* no error if file doesn't exist */
+spell_load_file(
+    char_u	*fname,
+    char_u	*lang,
+    slang_T	*old_lp,
+    int		silent)		/* no error if file doesn't exist */
 {
     FILE	*fd;
     char_u	buf[VIMSPELLMAGICL];
@@ -3025,10 +3003,7 @@
  * otherwise.
  */
     static char_u *
-read_cnt_string(fd, cnt_bytes, cntp)
-    FILE	*fd;
-    int		cnt_bytes;
-    int		*cntp;
+read_cnt_string(FILE *fd, int cnt_bytes, int *cntp)
 {
     int		cnt = 0;
     int		i;
@@ -3057,10 +3032,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_region_section(fd, lp, len)
-    FILE	*fd;
-    slang_T	*lp;
-    int		len;
+read_region_section(FILE *fd, slang_T *lp, int len)
 {
     int		i;
 
@@ -3078,8 +3050,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_charflags_section(fd)
-    FILE	*fd;
+read_charflags_section(FILE *fd)
 {
     char_u	*flags;
     char_u	*fol;
@@ -3116,9 +3087,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_prefcond_section(fd, lp)
-    FILE	*fd;
-    slang_T	*lp;
+read_prefcond_section(FILE *fd, slang_T *lp)
 {
     int		cnt;
     int		i;
@@ -3164,10 +3133,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_rep_section(fd, gap, first)
-    FILE	*fd;
-    garray_T	*gap;
-    short	*first;
+read_rep_section(FILE *fd, garray_T *gap, short *first)
 {
     int		cnt;
     fromto_T	*ftp;
@@ -3216,9 +3182,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_sal_section(fd, slang)
-    FILE	*fd;
-    slang_T	*slang;
+read_sal_section(FILE *fd, slang_T *slang)
 {
     int		i;
     int		cnt;
@@ -3369,10 +3333,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_words_section(fd, lp, len)
-    FILE	*fd;
-    slang_T	*lp;
-    int		len;
+read_words_section(FILE *fd, slang_T *lp, int len)
 {
     int		done = 0;
     int		i;
@@ -3406,11 +3367,11 @@
  * If it's already there then the counter is increased.
  */
     static void
-count_common_word(lp, word, len, count)
-    slang_T	*lp;
-    char_u	*word;
-    int		len;	    /* word length, -1 for upto NUL */
-    int		count;	    /* 1 to count once, 10 to init */
+count_common_word(
+    slang_T	*lp,
+    char_u	*word,
+    int		len,	    /* word length, -1 for upto NUL */
+    int		count)	    /* 1 to count once, 10 to init */
 {
     hash_T	hash;
     hashitem_T	*hi;
@@ -3449,11 +3410,11 @@
  * Adjust the score of common words.
  */
     static int
-score_wordcount_adj(slang, score, word, split)
-    slang_T	*slang;
-    int		score;
-    char_u	*word;
-    int		split;	    /* word was split, less bonus */
+score_wordcount_adj(
+    slang_T	*slang,
+    int		score,
+    char_u	*word,
+    int		split)	    /* word was split, less bonus */
 {
     hashitem_T	*hi;
     wordcount_T	*wc;
@@ -3486,9 +3447,7 @@
  * Return SP_*ERROR flags.
  */
     static int
-read_sofo_section(fd, slang)
-    FILE	*fd;
-    slang_T	*slang;
+read_sofo_section(FILE *fd, slang_T *slang)
 {
     int		cnt;
     char_u	*from, *to;
@@ -3528,10 +3487,7 @@
  * Returns SP_*ERROR flags.
  */
     static int
-read_compound(fd, slang, len)
-    FILE	*fd;
-    slang_T	*slang;
-    int		len;
+read_compound(FILE *fd, slang_T *slang, int len)
 {
     int		todo = len;
     int		c;
@@ -3728,9 +3684,7 @@
  * Like strchr() but independent of locale.
  */
     static int
-byte_in_str(str, n)
-    char_u	*str;
-    int		n;
+byte_in_str(char_u *str, int n)
 {
     char_u	*p;
 
@@ -3752,8 +3706,7 @@
  * in "slang->sl_syl_items".
  */
     static int
-init_syl_tab(slang)
-    slang_T	*slang;
+init_syl_tab(slang_T *slang)
 {
     char_u	*p;
     char_u	*s;
@@ -3791,9 +3744,7 @@
  * Returns zero if syllables are not defines.
  */
     static int
-count_syllables(slang, word)
-    slang_T	*slang;
-    char_u	*word;
+count_syllables(slang_T *slang, char_u *word)
 {
     int		cnt = 0;
     int		skip = FALSE;
@@ -3857,10 +3808,7 @@
  * Returns SP_*ERROR flags when there is something wrong.
  */
     static int
-set_sofo(lp, from, to)
-    slang_T	*lp;
-    char_u	*from;
-    char_u	*to;
+set_sofo(slang_T *lp, char_u *from, char_u *to)
 {
     int		i;
 
@@ -3949,8 +3897,7 @@
  * Fill the first-index table for "lp".
  */
     static void
-set_sal_first(lp)
-    slang_T	*lp;
+set_sal_first(slang_T *lp)
 {
     salfirst_T	*sfirst;
     int		i;
@@ -4015,8 +3962,7 @@
  * Return it in allocated memory (NULL for out-of-memory)
  */
     static int *
-mb_str2wide(s)
-    char_u	*s;
+mb_str2wide(char_u *s)
 {
     int		*res;
     char_u	*p;
@@ -4040,12 +3986,12 @@
  * Returns zero when OK, SP_ value for an error.
  */
     static int
-spell_read_tree(fd, bytsp, idxsp, prefixtree, prefixcnt)
-    FILE	*fd;
-    char_u	**bytsp;
-    idx_T	**idxsp;
-    int		prefixtree;	/* TRUE for the prefix tree */
-    int		prefixcnt;	/* when "prefixtree" is TRUE: prefix count */
+spell_read_tree(
+    FILE	*fd,
+    char_u	**bytsp,
+    idx_T	**idxsp,
+    int		prefixtree,	/* TRUE for the prefix tree */
+    int		prefixcnt)	/* when "prefixtree" is TRUE: prefix count */
 {
     int		len;
     int		idx;
@@ -4090,14 +4036,14 @@
  * Returns SP_FORMERROR if there is a format error.
  */
     static idx_T
-read_tree_node(fd, byts, idxs, maxidx, startidx, prefixtree, maxprefcondnr)
-    FILE	*fd;
-    char_u	*byts;
-    idx_T	*idxs;
-    int		maxidx;		    /* size of arrays */
-    idx_T	startidx;	    /* current index in "byts" and "idxs" */
-    int		prefixtree;	    /* TRUE for reading PREFIXTREE */
-    int		maxprefcondnr;	    /* maximum for <prefcondnr> */
+read_tree_node(
+    FILE	*fd,
+    char_u	*byts,
+    idx_T	*idxs,
+    int		maxidx,		    /* size of arrays */
+    idx_T	startidx,	    /* current index in "byts" and "idxs" */
+    int		prefixtree,	    /* TRUE for reading PREFIXTREE */
+    int		maxprefcondnr)	    /* maximum for <prefcondnr> */
 {
     int		len;
     int		i;
@@ -4206,8 +4152,7 @@
  * Returns NULL if it's OK, an error message otherwise.
  */
     char_u *
-did_set_spelllang(wp)
-    win_T	*wp;
+did_set_spelllang(win_T *wp)
 {
     garray_T	ga;
     char_u	*splp;
@@ -4530,8 +4475,7 @@
  * Clear the midword characters for buffer "buf".
  */
     static void
-clear_midword(wp)
-    win_T	*wp;
+clear_midword(win_T *wp)
 {
     vim_memset(wp->w_s->b_spell_ismw, 0, 256);
 #ifdef FEAT_MBYTE
@@ -4545,9 +4489,7 @@
  * They add up to any currently used midword characters.
  */
     static void
-use_midword(lp, wp)
-    slang_T	*lp;
-    win_T	*wp;
+use_midword(slang_T *lp, win_T *wp)
 {
     char_u	*p;
 
@@ -4593,9 +4535,7 @@
  * Returns the index if found (first is 0), REGION_ALL if not found.
  */
     static int
-find_region(rp, region)
-    char_u	*rp;
-    char_u	*region;
+find_region(char_u *rp, char_u *region)
 {
     int		i;
 
@@ -4617,9 +4557,9 @@
  * WoRd	wOrd	WF_KEEPCAP
  */
     static int
-captype(word, end)
-    char_u	*word;
-    char_u	*end;	    /* When NULL use up to NUL byte. */
+captype(
+    char_u	*word,
+    char_u	*end)	    /* When NULL use up to NUL byte. */
 {
     char_u	*p;
     int		c;
@@ -4673,9 +4613,7 @@
  * Add ALLCAP for "WOrD".
  */
     static int
-badword_captype(word, end)
-    char_u	*word;
-    char_u	*end;
+badword_captype(char_u *word, char_u *end)
 {
     int		flags = captype(word, end);
     int		c;
@@ -4720,7 +4658,7 @@
  * Delete the internal wordlist and its .spl file.
  */
     void
-spell_delete_wordlist()
+spell_delete_wordlist(void)
 {
     char_u	fname[MAXPATHL];
 
@@ -4739,7 +4677,7 @@
  * Free all languages.
  */
     void
-spell_free_all()
+spell_free_all(void)
 {
     slang_T	*slang;
     buf_T	*buf;
@@ -4770,7 +4708,7 @@
  * Used after 'encoding' is set and when ":mkspell" was used.
  */
     void
-spell_reload()
+spell_reload(void)
 {
     win_T	*wp;
 
@@ -4803,9 +4741,9 @@
  * Reload the spell file "fname" if it's loaded.
  */
     static void
-spell_reload_one(fname, added_word)
-    char_u	*fname;
-    int		added_word;	/* invoked through "zg" */
+spell_reload_one(
+    char_u	*fname,
+    int		added_word)	/* invoked through "zg" */
 {
     slang_T	*slang;
     int		didit = FALSE;
@@ -5213,9 +5151,7 @@
  * Returns an afffile_T, NULL for complete failure.
  */
     static afffile_T *
-spell_read_aff(spin, fname)
-    spellinfo_T	*spin;
-    char_u	*fname;
+spell_read_aff(spellinfo_T *spin, char_u *fname)
 {
     FILE	*fd;
     afffile_T	*aff;
@@ -6163,11 +6099,11 @@
  * a comment is following after item "mincount".
  */
     static int
-is_aff_rule(items, itemcnt, rulename, mincount)
-    char_u	**items;
-    int		itemcnt;
-    char	*rulename;
-    int		mincount;
+is_aff_rule(
+    char_u	**items,
+    int		itemcnt,
+    char	*rulename,
+    int		mincount)
 {
     return (STRCMP(items[0], rulename) == 0
 	    && (itemcnt == mincount
@@ -6179,9 +6115,7 @@
  * ae_flags to ae_comppermit and ae_compforbid.
  */
     static void
-aff_process_flags(affile, entry)
-    afffile_T	*affile;
-    affentry_T	*entry;
+aff_process_flags(afffile_T *affile, affentry_T *entry)
 {
     char_u	*p;
     char_u	*prevp;
@@ -6215,8 +6149,7 @@
  * Return TRUE if "s" is the name of an info item in the affix file.
  */
     static int
-spell_info_item(s)
-    char_u	*s;
+spell_info_item(char_u *s)
 {
     return STRCMP(s, "NAME") == 0
 	|| STRCMP(s, "HOME") == 0
@@ -6231,11 +6164,11 @@
  * returns zero for failure.
  */
     static unsigned
-affitem2flag(flagtype, item, fname, lnum)
-    int		flagtype;
-    char_u	*item;
-    char_u	*fname;
-    int		lnum;
+affitem2flag(
+    int		flagtype,
+    char_u	*item,
+    char_u	*fname,
+    int		lnum)
 {
     unsigned	res;
     char_u	*p = item;
@@ -6264,9 +6197,7 @@
  * Returns zero for an error, still advances the pointer then.
  */
     static unsigned
-get_affitem(flagtype, pp)
-    int		flagtype;
-    char_u	**pp;
+get_affitem(int flagtype, char_u **pp)
 {
     int		res;
 
@@ -6308,10 +6239,10 @@
  * they fit in one byte.
  */
     static void
-process_compflags(spin, aff, compflags)
-    spellinfo_T	*spin;
-    afffile_T	*aff;
-    char_u	*compflags;
+process_compflags(
+    spellinfo_T	*spin,
+    afffile_T	*aff,
+    char_u	*compflags)
 {
     char_u	*p;
     char_u	*prevp;
@@ -6392,8 +6323,7 @@
  * When that is used up an error message is given.
  */
     static void
-check_renumber(spin)
-    spellinfo_T	*spin;
+check_renumber(spellinfo_T *spin)
 {
     if (spin->si_newprefID == spin->si_newcompID && spin->si_newcompID < 128)
     {
@@ -6406,10 +6336,7 @@
  * Return TRUE if flag "flag" appears in affix list "afflist".
  */
     static int
-flag_in_afflist(flagtype, afflist, flag)
-    int		flagtype;
-    char_u	*afflist;
-    unsigned	flag;
+flag_in_afflist(int flagtype, char_u *afflist, unsigned flag)
 {
     char_u	*p;
     unsigned	n;
@@ -6458,10 +6385,7 @@
  * Give a warning when "spinval" and "affval" numbers are set and not the same.
  */
     static void
-aff_check_number(spinval, affval, name)
-    int	    spinval;
-    int	    affval;
-    char    *name;
+aff_check_number(int spinval, int affval, char *name)
 {
     if (spinval != 0 && spinval != affval)
 	smsg((char_u *)_("%s value differs from what is used in another .aff file"), name);
@@ -6471,10 +6395,7 @@
  * Give a warning when "spinval" and "affval" strings are set and not the same.
  */
     static void
-aff_check_string(spinval, affval, name)
-    char_u	*spinval;
-    char_u	*affval;
-    char	*name;
+aff_check_string(char_u *spinval, char_u *affval, char *name)
 {
     if (spinval != NULL && STRCMP(spinval, affval) != 0)
 	smsg((char_u *)_("%s value differs from what is used in another .aff file"), name);
@@ -6485,9 +6406,7 @@
  * NULL as equal.
  */
     static int
-str_equal(s1, s2)
-    char_u	*s1;
-    char_u	*s2;
+str_equal(char_u *s1, char_u *s2)
 {
     if (s1 == NULL || s2 == NULL)
 	return s1 == s2;
@@ -6499,11 +6418,11 @@
  * They are stored case-folded.
  */
     static void
-add_fromto(spin, gap, from, to)
-    spellinfo_T	*spin;
-    garray_T	*gap;
-    char_u	*from;
-    char_u	*to;
+add_fromto(
+    spellinfo_T	*spin,
+    garray_T	*gap,
+    char_u	*from,
+    char_u	*to)
 {
     fromto_T	*ftp;
     char_u	word[MAXWLEN];
@@ -6523,8 +6442,7 @@
  * Convert a boolean argument in a SAL line to TRUE or FALSE;
  */
     static int
-sal_to_bool(s)
-    char_u	*s;
+sal_to_bool(char_u *s)
 {
     return STRCMP(s, "1") == 0 || STRCMP(s, "true") == 0;
 }
@@ -6533,8 +6451,7 @@
  * Free the structure filled by spell_read_aff().
  */
     static void
-spell_free_aff(aff)
-    afffile_T	*aff;
+spell_free_aff(afffile_T *aff)
 {
     hashtab_T	*ht;
     hashitem_T	*hi;
@@ -6572,10 +6489,7 @@
  * Returns OK or FAIL;
  */
     static int
-spell_read_dic(spin, fname, affile)
-    spellinfo_T	*spin;
-    char_u	*fname;
-    afffile_T	*affile;
+spell_read_dic(spellinfo_T *spin, char_u *fname, afffile_T *affile)
 {
     hashtab_T	ht;
     char_u	line[MAXLINELEN];
@@ -6789,9 +6703,7 @@
  * Return WF_ flags.
  */
     static int
-get_affix_flags(affile, afflist)
-    afffile_T	*affile;
-    char_u	*afflist;
+get_affix_flags(afffile_T *affile, char_u *afflist)
 {
     int		flags = 0;
 
@@ -6823,10 +6735,10 @@
  * and return the number of affixes.
  */
     static int
-get_pfxlist(affile, afflist, store_afflist)
-    afffile_T	*affile;
-    char_u	*afflist;
-    char_u	*store_afflist;
+get_pfxlist(
+    afffile_T	*affile,
+    char_u	*afflist,
+    char_u	*store_afflist)
 {
     char_u	*p;
     char_u	*prevp;
@@ -6865,10 +6777,10 @@
  * Puts the flags in "store_afflist[]".
  */
     static void
-get_compflags(affile, afflist, store_afflist)
-    afffile_T	*affile;
-    char_u	*afflist;
-    char_u	*store_afflist;
+get_compflags(
+    afffile_T	*affile,
+    char_u	*afflist,
+    char_u	*store_afflist)
 {
     char_u	*p;
     char_u	*prevp;
@@ -6904,18 +6816,17 @@
  * Returns FAIL when out of memory.
  */
     static int
-store_aff_word(spin, word, afflist, affile, ht, xht, condit, flags,
-							      pfxlist, pfxlen)
-    spellinfo_T	*spin;		/* spell info */
-    char_u	*word;		/* basic word start */
-    char_u	*afflist;	/* list of names of supported affixes */
-    afffile_T	*affile;
-    hashtab_T	*ht;
-    hashtab_T	*xht;
-    int		condit;		/* CONDIT_SUF et al. */
-    int		flags;		/* flags for the word */
-    char_u	*pfxlist;	/* list of prefix IDs */
-    int		pfxlen;		/* nr of flags in "pfxlist" for prefixes, rest
+store_aff_word(
+    spellinfo_T	*spin,		/* spell info */
+    char_u	*word,		/* basic word start */
+    char_u	*afflist,	/* list of names of supported affixes */
+    afffile_T	*affile,
+    hashtab_T	*ht,
+    hashtab_T	*xht,
+    int		condit,		/* CONDIT_SUF et al. */
+    int		flags,		/* flags for the word */
+    char_u	*pfxlist,	/* list of prefix IDs */
+    int		pfxlen)		/* nr of flags in "pfxlist" for prefixes, rest
 				 * is compound flags */
 {
     int		todo;
@@ -7170,9 +7081,7 @@
  * Read a file with a list of words.
  */
     static int
-spell_read_wordfile(spin, fname)
-    spellinfo_T	*spin;
-    char_u	*fname;
+spell_read_wordfile(spellinfo_T *spin, char_u *fname)
 {
     FILE	*fd;
     long	lnum = 0;
@@ -7380,10 +7289,10 @@
  * Returns NULL when out of memory.
  */
     static void *
-getroom(spin, len, align)
-    spellinfo_T *spin;
-    size_t	len;		/* length needed */
-    int		align;		/* align for pointer */
+getroom(
+    spellinfo_T *spin,
+    size_t	len,		/* length needed */
+    int		align)		/* align for pointer */
 {
     char_u	*p;
     sblock_T	*bl = spin->si_blocks;
@@ -7428,9 +7337,7 @@
  * Returns NULL when out of memory.
  */
     static char_u *
-getroom_save(spin, s)
-    spellinfo_T	*spin;
-    char_u	*s;
+getroom_save(spellinfo_T *spin, char_u *s)
 {
     char_u	*sc;
 
@@ -7445,8 +7352,7 @@
  * Free the list of allocated sblock_T.
  */
     static void
-free_blocks(bl)
-    sblock_T	*bl;
+free_blocks(sblock_T *bl)
 {
     sblock_T	*next;
 
@@ -7463,8 +7369,7 @@
  * Returns NULL when out of memory.
  */
     static wordnode_T *
-wordtree_alloc(spin)
-    spellinfo_T *spin;
+wordtree_alloc(spellinfo_T *spin)
 {
     return (wordnode_T *)getroom(spin, sizeof(wordnode_T), TRUE);
 }
@@ -7479,13 +7384,13 @@
  * compound flag.
  */
     static int
-store_word(spin, word, flags, region, pfxlist, need_affix)
-    spellinfo_T	*spin;
-    char_u	*word;
-    int		flags;		/* extra flags, WF_BANNED */
-    int		region;		/* supported region(s) */
-    char_u	*pfxlist;	/* list of prefix IDs or NULL */
-    int		need_affix;	/* only store word with affix ID */
+store_word(
+    spellinfo_T	*spin,
+    char_u	*word,
+    int		flags,		/* extra flags, WF_BANNED */
+    int		region,		/* supported region(s) */
+    char_u	*pfxlist,	/* list of prefix IDs or NULL */
+    int		need_affix)	/* only store word with affix ID */
 {
     int		len = (int)STRLEN(word);
     int		ct = captype(word, word + len);
@@ -7526,13 +7431,13 @@
  * Returns FAIL when out of memory.
  */
     static int
-tree_add_word(spin, word, root, flags, region, affixID)
-    spellinfo_T	*spin;
-    char_u	*word;
-    wordnode_T	*root;
-    int		flags;
-    int		region;
-    int		affixID;
+tree_add_word(
+    spellinfo_T	*spin,
+    char_u	*word,
+    wordnode_T	*root,
+    int		flags,
+    int		region,
+    int		affixID)
 {
     wordnode_T	*node = root;
     wordnode_T	*np;
@@ -7706,7 +7611,7 @@
  * Sets "sps_flags".
  */
     int
-spell_check_msm()
+spell_check_msm(void)
 {
     char_u	*p = p_msm;
     long	start = 0;
@@ -7748,8 +7653,7 @@
  * Returns NULL when out of memory.
  */
     static wordnode_T *
-get_wordnode(spin)
-    spellinfo_T	    *spin;
+get_wordnode(spellinfo_T *spin)
 {
     wordnode_T *n;
 
@@ -7776,9 +7680,7 @@
  * Returns the number of nodes actually freed.
  */
     static int
-deref_wordnode(spin, node)
-    spellinfo_T *spin;
-    wordnode_T  *node;
+deref_wordnode(spellinfo_T *spin, wordnode_T *node)
 {
     wordnode_T	*np;
     int		cnt = 0;
@@ -7802,9 +7704,7 @@
  * Only the "wn_child" field becomes invalid.
  */
     static void
-free_wordnode(spin, n)
-    spellinfo_T	*spin;
-    wordnode_T  *n;
+free_wordnode(spellinfo_T *spin, wordnode_T *n)
 {
     n->wn_child = spin->si_first_free;
     spin->si_first_free = n;
@@ -7815,9 +7715,7 @@
  * Compress a tree: find tails that are identical and can be shared.
  */
     static void
-wordtree_compress(spin, root)
-    spellinfo_T	    *spin;
-    wordnode_T	    *root;
+wordtree_compress(spellinfo_T *spin, wordnode_T *root)
 {
     hashtab_T	    ht;
     int		    n;
@@ -7858,11 +7756,11 @@
  * Returns the number of compressed nodes.
  */
     static int
-node_compress(spin, node, ht, tot)
-    spellinfo_T	*spin;
-    wordnode_T	*node;
-    hashtab_T	*ht;
-    int		*tot;	    /* total count of nodes before compressing,
+node_compress(
+    spellinfo_T	*spin,
+    wordnode_T	*node,
+    hashtab_T	*ht,
+    int		*tot)	    /* total count of nodes before compressing,
 			       incremented while going through the tree */
 {
     wordnode_T	*np;
@@ -7964,9 +7862,7 @@
  * Return TRUE when two nodes have identical siblings and children.
  */
     static int
-node_equal(n1, n2)
-    wordnode_T	*n1;
-    wordnode_T	*n2;
+node_equal(wordnode_T *n1, wordnode_T *n2)
 {
     wordnode_T	*p1;
     wordnode_T	*p2;
@@ -7997,9 +7893,7 @@
 #ifdef __BORLANDC__
 _RTLENTRYF
 #endif
-rep_compare(s1, s2)
-    const void	*s1;
-    const void	*s2;
+rep_compare(const void *s1, const void *s2)
 {
     fromto_T	*p1 = (fromto_T *)s1;
     fromto_T	*p2 = (fromto_T *)s2;
@@ -8012,9 +7906,7 @@
  * Return FAIL or OK;
  */
     static int
-write_vim_spell(spin, fname)
-    spellinfo_T	*spin;
-    char_u	*fname;
+write_vim_spell(spellinfo_T *spin, char_u *fname)
 {
     FILE	*fd;
     int		regionmask;
@@ -8434,8 +8326,7 @@
  * space.
  */
     static void
-clear_node(node)
-    wordnode_T	*node;
+clear_node(wordnode_T *node)
 {
     wordnode_T	*np;
 
@@ -8464,12 +8355,12 @@
  * Returns the number of nodes used.
  */
     static int
-put_node(fd, node, idx, regionmask, prefixtree)
-    FILE	*fd;		/* NULL when only counting */
-    wordnode_T	*node;
-    int		idx;
-    int		regionmask;
-    int		prefixtree;	/* TRUE for PREFIXTREE */
+put_node(
+    FILE	*fd,		/* NULL when only counting */
+    wordnode_T	*node,
+    int		idx,
+    int		regionmask,
+    int		prefixtree)	/* TRUE for PREFIXTREE */
 {
     int		newindex = idx;
     int		siblingcount = 0;
@@ -8594,8 +8485,7 @@
  * ":mkspell [-ascii] addfile"
  */
     void
-ex_mkspell(eap)
-    exarg_T *eap;
+ex_mkspell(exarg_T *eap)
 {
     int		fcount;
     char_u	**fnames;
@@ -8622,9 +8512,7 @@
  * Writes the file with the name "wfname", with ".spl" changed to ".sug".
  */
     static void
-spell_make_sugfile(spin, wfname)
-    spellinfo_T	*spin;
-    char_u	*wfname;
+spell_make_sugfile(spellinfo_T *spin, char_u *wfname)
 {
     char_u	*fname = NULL;
     int		len;
@@ -8711,9 +8599,7 @@
  * Build the soundfold trie for language "slang".
  */
     static int
-sug_filltree(spin, slang)
-    spellinfo_T	*spin;
-    slang_T	*slang;
+sug_filltree(spellinfo_T *spin, slang_T *slang)
 {
     char_u	*byts;
     idx_T	*idxs;
@@ -8819,8 +8705,7 @@
  * Returns FAIL when out of memory.
  */
     static int
-sug_maketable(spin)
-    spellinfo_T	*spin;
+sug_maketable(spellinfo_T *spin)
 {
     garray_T	ga;
     int		res = OK;
@@ -8849,11 +8734,11 @@
  * Returns -1 when out of memory.
  */
     static int
-sug_filltable(spin, node, startwordnr, gap)
-    spellinfo_T	*spin;
-    wordnode_T	*node;
-    int		startwordnr;
-    garray_T	*gap;	    /* place to store line of numbers */
+sug_filltable(
+    spellinfo_T	*spin,
+    wordnode_T	*node,
+    int		startwordnr,
+    garray_T	*gap)	    /* place to store line of numbers */
 {
     wordnode_T	*p, *np;
     int		wordnr = startwordnr;
@@ -8916,9 +8801,7 @@
  * bytes.
  */
     static int
-offset2bytes(nr, buf)
-    int	    nr;
-    char_u  *buf;
+offset2bytes(int nr, char_u *buf)
 {
     int	    rem;
     int	    b1, b2, b3, b4;
@@ -8963,8 +8846,7 @@
  * Returns the offset.
  */
     static int
-bytes2offset(pp)
-    char_u	**pp;
+bytes2offset(char_u **pp)
 {
     char_u	*p = *pp;
     int		nr;
@@ -9002,9 +8884,7 @@
  * Write the .sug file in "fname".
  */
     static void
-sug_write(spin, fname)
-    spellinfo_T	*spin;
-    char_u	*fname;
+sug_write(spellinfo_T *spin, char_u *fname)
 {
     FILE	*fd;
     wordnode_T	*tree;
@@ -9101,7 +8981,7 @@
  * Returns NULL when out of memory.
  */
     static buf_T *
-open_spellbuf()
+open_spellbuf(void)
 {
     buf_T	*buf;
 
@@ -9123,8 +9003,7 @@
  * Close the buffer used for spell info.
  */
     static void
-close_spellbuf(buf)
-    buf_T	*buf;
+close_spellbuf(buf_T *buf)
 {
     if (buf != NULL)
     {
@@ -9142,12 +9021,12 @@
  * and ".spl" is appended to make the output file name.
  */
     static void
-mkspell(fcount, fnames, ascii, over_write, added_word)
-    int		fcount;
-    char_u	**fnames;
-    int		ascii;		    /* -ascii argument given */
-    int		over_write;	    /* overwrite existing output file */
-    int		added_word;	    /* invoked through "zg" */
+mkspell(
+    int		fcount,
+    char_u	**fnames,
+    int		ascii,		    /* -ascii argument given */
+    int		over_write,	    /* overwrite existing output file */
+    int		added_word)	    /* invoked through "zg" */
 {
     char_u	*fname = NULL;
     char_u	*wfname;
@@ -9402,9 +9281,7 @@
  * ":mkspell".  "str" can be IObuff.
  */
     static void
-spell_message(spin, str)
-    spellinfo_T *spin;
-    char_u	*str;
+spell_message(spellinfo_T *spin, char_u *str)
 {
     if (spin->si_verbose || p_verbose > 2)
     {
@@ -9423,8 +9300,7 @@
  * ":[count]spellundo  {word}"
  */
     void
-ex_spell(eap)
-    exarg_T *eap;
+ex_spell(exarg_T *eap)
 {
     spell_add_word(eap->arg, (int)STRLEN(eap->arg), eap->cmdidx == CMD_spellwrong,
 				   eap->forceit ? 0 : (int)eap->line2,
@@ -9435,13 +9311,13 @@
  * Add "word[len]" to 'spellfile' as a good or bad word.
  */
     void
-spell_add_word(word, len, bad, idx, undo)
-    char_u	*word;
-    int		len;
-    int		bad;
-    int		idx;	    /* "zG" and "zW": zero, otherwise index in
+spell_add_word(
+    char_u	*word,
+    int		len,
+    int		bad,
+    int		idx,	    /* "zG" and "zW": zero, otherwise index in
 			       'spellfile' */
-    int		undo;	    /* TRUE for "zug", "zuG", "zuw" and "zuW" */
+    int		undo)	    /* TRUE for "zug", "zuG", "zuw" and "zuW" */
 {
     FILE	*fd = NULL;
     buf_T	*buf = NULL;
@@ -9604,7 +9480,7 @@
  * Initialize 'spellfile' for the current buffer.
  */
     static void
-init_spellfile()
+init_spellfile(void)
 {
     char_u	*buf;
     int		l;
@@ -9685,8 +9561,7 @@
  * EBCDIC is not supported!
  */
     static void
-clear_spell_chartab(sp)
-    spelltab_T	*sp;
+clear_spell_chartab(spelltab_T *sp)
 {
     int		i;
 
@@ -9724,7 +9599,7 @@
  * locale.  For utf-8 we don't use isalpha() but our own functions.
  */
     void
-init_spell_chartab()
+init_spell_chartab(void)
 {
     int	    i;
 
@@ -9779,10 +9654,7 @@
  * Set the spell character tables from strings in the affix file.
  */
     static int
-set_spell_chartab(fol, low, upp)
-    char_u	*fol;
-    char_u	*low;
-    char_u	*upp;
+set_spell_chartab(char_u *fol, char_u *low, char_u *upp)
 {
     /* We build the new tables here first, so that we can compare with the
      * previous one. */
@@ -9857,10 +9729,10 @@
  * Set the spell character tables from strings in the .spl file.
  */
     static void
-set_spell_charflags(flags, cnt, fol)
-    char_u	*flags;
-    int		cnt;	    /* length of "flags" */
-    char_u	*fol;
+set_spell_charflags(
+    char_u	*flags,
+    int		cnt,	    /* length of "flags" */
+    char_u	*fol)
 {
     /* We build the new tables here first, so that we can compare with the
      * previous one. */
@@ -9896,8 +9768,7 @@
 }
 
     static int
-set_spell_finish(new_st)
-    spelltab_T	*new_st;
+set_spell_finish(spelltab_T *new_st)
 {
     int		i;
 
@@ -9933,9 +9804,9 @@
  * Thus this only works properly when past the first character of the word.
  */
     static int
-spell_iswordp(p, wp)
-    char_u	*p;
-    win_T	*wp;	    /* buffer used */
+spell_iswordp(
+    char_u	*p,
+    win_T	*wp)	    /* buffer used */
 {
 #ifdef FEAT_MBYTE
     char_u	*s;
@@ -9976,9 +9847,7 @@
  * Unlike spell_iswordp() this doesn't check for "midword" characters.
  */
     static int
-spell_iswordp_nmw(p, wp)
-    char_u	*p;
-    win_T	*wp;
+spell_iswordp_nmw(char_u *p, win_T *wp)
 {
 #ifdef FEAT_MBYTE
     int		c;
@@ -10002,9 +9871,7 @@
  * See also dbcs_class() and utf_class() in mbyte.c.
  */
     static int
-spell_mb_isword_class(cl, wp)
-    int		cl;
-    win_T	*wp;
+spell_mb_isword_class(int cl, win_T *wp)
 {
     if (wp->w_s->b_cjk)
 	/* East Asian characters are not considered word characters. */
@@ -10017,9 +9884,7 @@
  * Wide version of spell_iswordp().
  */
     static int
-spell_iswordp_w(p, wp)
-    int		*p;
-    win_T	*wp;
+spell_iswordp_w(int *p, win_T *wp)
 {
     int		*s;
 
@@ -10048,9 +9913,7 @@
  * When "fd" is NULL only count the length of what is written.
  */
     static int
-write_spell_prefcond(fd, gap)
-    FILE	*fd;
-    garray_T	*gap;
+write_spell_prefcond(FILE *fd, garray_T *gap)
 {
     int		i;
     char_u	*p;
@@ -10091,11 +9954,11 @@
  * Returns FAIL when something wrong.
  */
     static int
-spell_casefold(str, len, buf, buflen)
-    char_u	*str;
-    int		len;
-    char_u	*buf;
-    int		buflen;
+spell_casefold(
+    char_u	*str,
+    int		len,
+    char_u	*buf,
+    int		buflen)
 {
     int		i;
 
@@ -10150,7 +10013,7 @@
  * Sets "sps_flags" and "sps_limit".
  */
     int
-spell_check_sps()
+spell_check_sps(void)
 {
     char_u	*p;
     char_u	*s;
@@ -10205,8 +10068,7 @@
  * When "count" is non-zero use that suggestion.
  */
     void
-spell_suggest(count)
-    int		count;
+spell_suggest(int count)
 {
     char_u	*line;
     pos_T	prev_cursor = curwin->w_cursor;
@@ -10448,9 +10310,7 @@
  * capital.  This uses 'spellcapcheck' of the current buffer.
  */
     static int
-check_need_cap(lnum, col)
-    linenr_T	lnum;
-    colnr_T	col;
+check_need_cap(linenr_T lnum, colnr_T col)
 {
     int		need_cap = FALSE;
     char_u	*line;
@@ -10518,8 +10378,7 @@
  * ":spellrepall"
  */
     void
-ex_spellrepall(eap)
-    exarg_T *eap UNUSED;
+ex_spellrepall(exarg_T *eap UNUSED)
 {
     pos_T	pos = curwin->w_cursor;
     char_u	*frompat;
@@ -10591,12 +10450,12 @@
  * a list of allocated strings.
  */
     void
-spell_suggest_list(gap, word, maxcount, need_cap, interactive)
-    garray_T	*gap;
-    char_u	*word;
-    int		maxcount;	/* maximum nr of suggestions */
-    int		need_cap;	/* 'spellcapcheck' matched */
-    int		interactive;
+spell_suggest_list(
+    garray_T	*gap,
+    char_u	*word,
+    int		maxcount,	/* maximum nr of suggestions */
+    int		need_cap,	/* 'spellcapcheck' matched */
+    int		interactive)
 {
     suginfo_T	sug;
     int		i;
@@ -10636,14 +10495,14 @@
  * This is based on the mechanisms of Aspell, but completely reimplemented.
  */
     static void
-spell_find_suggest(badptr, badlen, su, maxcount, banbadword, need_cap, interactive)
-    char_u	*badptr;
-    int		badlen;		/* length of bad word or 0 if unknown */
-    suginfo_T	*su;
-    int		maxcount;
-    int		banbadword;	/* don't include badword in suggestions */
-    int		need_cap;	/* word should start with capital */
-    int		interactive;
+spell_find_suggest(
+    char_u	*badptr,
+    int		badlen,		/* length of bad word or 0 if unknown */
+    suginfo_T	*su,
+    int		maxcount,
+    int		banbadword,	/* don't include badword in suggestions */
+    int		need_cap,	/* word should start with capital */
+    int		interactive)
 {
     hlf_T	attr = HLF_COUNT;
     char_u	buf[MAXPATHL];
@@ -10769,9 +10628,7 @@
  * Find suggestions by evaluating expression "expr".
  */
     static void
-spell_suggest_expr(su, expr)
-    suginfo_T	*su;
-    char_u	*expr;
+spell_suggest_expr(suginfo_T *su, char_u *expr)
 {
     list_T	*list;
     listitem_T	*li;
@@ -10807,9 +10664,7 @@
  * Find suggestions in file "fname".  Used for "file:" in 'spellsuggest'.
  */
     static void
-spell_suggest_file(su, fname)
-    suginfo_T	*su;
-    char_u	*fname;
+spell_suggest_file(suginfo_T *su, char_u *fname)
 {
     FILE	*fd;
     char_u	line[MAXWLEN * 2];
@@ -10865,9 +10720,7 @@
  * Find suggestions for the internal method indicated by "sps_flags".
  */
     static void
-spell_suggest_intern(su, interactive)
-    suginfo_T	*su;
-    int		interactive;
+spell_suggest_intern(suginfo_T *su, int interactive)
 {
     /*
      * Load the .sug file(s) that are available and not done yet.
@@ -10959,7 +10812,7 @@
  * Load the .sug files for languages that have one and weren't loaded yet.
  */
     static void
-suggest_load_files()
+suggest_load_files(void)
 {
     langp_T	*lp;
     int		lpi;
@@ -11100,9 +10953,7 @@
  * Returns the total number of words.
  */
     static void
-tree_count_words(byts, idxs)
-    char_u	*byts;
-    idx_T	*idxs;
+tree_count_words(char_u *byts, idx_T *idxs)
 {
     int		depth;
     idx_T	arridx[MAXWLEN];
@@ -11163,8 +11014,7 @@
  * Free the info put in "*su" by spell_find_suggest().
  */
     static void
-spell_find_cleanup(su)
-    suginfo_T	*su;
+spell_find_cleanup(suginfo_T *su)
 {
     int		i;
 
@@ -11186,10 +11036,10 @@
  * The result is NUL terminated.
  */
     static void
-onecap_copy(word, wcopy, upper)
-    char_u	*word;
-    char_u	*wcopy;
-    int		upper;	    /* TRUE: first letter made upper case */
+onecap_copy(
+    char_u	*word,
+    char_u	*wcopy,
+    int		upper)	    /* TRUE: first letter made upper case */
 {
     char_u	*p;
     int		c;
@@ -11223,9 +11073,7 @@
  * "wcopy[MAXWLEN]".  The result is NUL terminated.
  */
     static void
-allcap_copy(word, wcopy)
-    char_u	*word;
-    char_u	*wcopy;
+allcap_copy(char_u *word, char_u *wcopy)
 {
     char_u	*s;
     char_u	*d;
@@ -11277,8 +11125,7 @@
  * Try finding suggestions by recognizing specific situations.
  */
     static void
-suggest_try_special(su)
-    suginfo_T	*su;
+suggest_try_special(suginfo_T *su)
 {
     char_u	*p;
     size_t	len;
@@ -11361,8 +11208,7 @@
  * Try finding suggestions by adding/removing/swapping letters.
  */
     static void
-suggest_try_change(su)
-    suginfo_T	*su;
+suggest_try_change(suginfo_T *su)
 {
     char_u	fword[MAXWLEN];	    /* copy of the bad word, case-folded */
     int		n;
@@ -11434,11 +11280,11 @@
  *	use "slang->sl_repsal" instead of "lp->lp_replang->sl_rep"
  */
     static void
-suggest_trie_walk(su, lp, fword, soundfold)
-    suginfo_T	*su;
-    langp_T	*lp;
-    char_u	*fword;
-    int		soundfold;
+suggest_trie_walk(
+    suginfo_T	*su,
+    langp_T	*lp,
+    char_u	*fword,
+    int		soundfold)
 {
     char_u	tword[MAXWLEN];	    /* good word collected so far */
     trystate_T	stack[MAXWLEN];
@@ -12934,10 +12780,7 @@
  * Go one level deeper in the tree.
  */
     static void
-go_deeper(stack, depth, score_add)
-    trystate_T	*stack;
-    int		depth;
-    int		score_add;
+go_deeper(trystate_T *stack, int depth, int score_add)
 {
     stack[depth + 1] = stack[depth];
     stack[depth + 1].ts_state = STATE_START;
@@ -12952,10 +12795,7 @@
  * fword[flen] and return the byte length of that many chars in "word".
  */
     static int
-nofold_len(fword, flen, word)
-    char_u	*fword;
-    int		flen;
-    char_u	*word;
+nofold_len(char_u *fword, int flen, char_u *word)
 {
     char_u	*p;
     int		i = 0;
@@ -12975,10 +12815,7 @@
  * same case-folded word, but we only find one...
  */
     static void
-find_keepcap_word(slang, fword, kword)
-    slang_T	*slang;
-    char_u	*fword;
-    char_u	*kword;
+find_keepcap_word(slang_T *slang, char_u *fword, char_u *kword)
 {
     char_u	uword[MAXWLEN];		/* "fword" in upper-case */
     int		depth;
@@ -13134,8 +12971,7 @@
  * su->su_sga.
  */
     static void
-score_comp_sal(su)
-    suginfo_T	*su;
+score_comp_sal(suginfo_T *su)
 {
     langp_T	*lp;
     char_u	badsound[MAXWLEN];
@@ -13189,8 +13025,7 @@
  * They are entwined.
  */
     static void
-score_combine(su)
-    suginfo_T	*su;
+score_combine(suginfo_T *su)
 {
     int		i;
     int		j;
@@ -13302,11 +13137,11 @@
  * badword.
  */
     static int
-stp_sal_score(stp, su, slang, badsound)
-    suggest_T	*stp;
-    suginfo_T	*su;
-    slang_T	*slang;
-    char_u	*badsound;	/* sound-folded badword */
+stp_sal_score(
+    suggest_T	*stp,
+    suginfo_T	*su,
+    slang_T	*slang,
+    char_u	*badsound)	/* sound-folded badword */
 {
     char_u	*p;
     char_u	*pbad;
@@ -13372,7 +13207,7 @@
  * Prepare for calling suggest_try_soundalike().
  */
     static void
-suggest_try_soundalike_prep()
+suggest_try_soundalike_prep(void)
 {
     langp_T	*lp;
     int		lpi;
@@ -13395,8 +13230,7 @@
  * Note: This doesn't support postponed prefixes.
  */
     static void
-suggest_try_soundalike(su)
-    suginfo_T	*su;
+suggest_try_soundalike(suginfo_T *su)
 {
     char_u	salword[MAXWLEN];
     langp_T	*lp;
@@ -13432,7 +13266,7 @@
  * Finish up after calling suggest_try_soundalike().
  */
     static void
-suggest_try_soundalike_finish()
+suggest_try_soundalike_finish(void)
 {
     langp_T	*lp;
     int		lpi;
@@ -13469,11 +13303,11 @@
  * produce this soundfolded word.
  */
     static void
-add_sound_suggest(su, goodword, score, lp)
-    suginfo_T	*su;
-    char_u	*goodword;
-    int		score;		/* soundfold score  */
-    langp_T	*lp;
+add_sound_suggest(
+    suginfo_T	*su,
+    char_u	*goodword,
+    int		score,		/* soundfold score  */
+    langp_T	*lp)
 {
     slang_T	*slang = lp->lp_slang;	/* language for sound folding */
     int		sfwordnr;
@@ -13677,9 +13511,7 @@
  * Find word "word" in fold-case tree for "slang" and return the word number.
  */
     static int
-soundfold_find(slang, word)
-    slang_T	*slang;
-    char_u	*word;
+soundfold_find(slang_T *slang, char_u *word)
 {
     idx_T	arridx = 0;
     int		len;
@@ -13753,10 +13585,7 @@
  * Copy "fword" to "cword", fixing case according to "flags".
  */
     static void
-make_case_word(fword, cword, flags)
-    char_u	*fword;
-    char_u	*cword;
-    int		flags;
+make_case_word(char_u *fword, char_u *cword, int flags)
 {
     if (flags & WF_ALLCAP)
 	/* Make it all upper-case */
@@ -13773,9 +13602,7 @@
  * Use map string "map" for languages "lp".
  */
     static void
-set_map_str(lp, map)
-    slang_T	*lp;
-    char_u	*map;
+set_map_str(slang_T *lp, char_u *map)
 {
     char_u	*p;
     int		headc = 0;
@@ -13858,10 +13685,7 @@
  * lines in the .aff file.
  */
     static int
-similar_chars(slang, c1, c2)
-    slang_T	*slang;
-    int		c1;
-    int		c2;
+similar_chars(slang_T *slang, int c1, int c2)
 {
     int		m1, m2;
 #ifdef FEAT_MBYTE
@@ -13906,17 +13730,16 @@
  * For a suggestion that is already in the list the lowest score is remembered.
  */
     static void
-add_suggestion(su, gap, goodword, badlenarg, score, altscore, had_bonus,
-								 slang, maxsf)
-    suginfo_T	*su;
-    garray_T	*gap;		/* either su_ga or su_sga */
-    char_u	*goodword;
-    int		badlenarg;	/* len of bad word replaced with "goodword" */
-    int		score;
-    int		altscore;
-    int		had_bonus;	/* value for st_had_bonus */
-    slang_T	*slang;		/* language for sound folding */
-    int		maxsf;		/* su_maxscore applies to soundfold score,
+add_suggestion(
+    suginfo_T	*su,
+    garray_T	*gap,		/* either su_ga or su_sga */
+    char_u	*goodword,
+    int		badlenarg,	/* len of bad word replaced with "goodword" */
+    int		score,
+    int		altscore,
+    int		had_bonus,	/* value for st_had_bonus */
+    slang_T	*slang,		/* language for sound folding */
+    int		maxsf)		/* su_maxscore applies to soundfold score,
 				   su_sfmaxscore to the total score. */
 {
     int		goodlen;	/* len of goodword changed */
@@ -14043,9 +13866,9 @@
  * for split words, such as "the the".  Remove these from the list here.
  */
     static void
-check_suggestions(su, gap)
-    suginfo_T	*su;
-    garray_T	*gap;		    /* either su_ga or su_sga */
+check_suggestions(
+    suginfo_T	*su,
+    garray_T	*gap)		    /* either su_ga or su_sga */
 {
     suggest_T   *stp;
     int		i;
@@ -14080,9 +13903,9 @@
  * Add a word to be banned.
  */
     static void
-add_banned(su, word)
-    suginfo_T	*su;
-    char_u	*word;
+add_banned(
+    suginfo_T	*su,
+    char_u	*word)
 {
     char_u	*s;
     hash_T	hash;
@@ -14103,8 +13926,7 @@
  * is slow, thus only done for the final results.
  */
     static void
-rescore_suggestions(su)
-    suginfo_T	*su;
+rescore_suggestions(suginfo_T *su)
 {
     int		i;
 
@@ -14117,9 +13939,7 @@
  * Recompute the score for one suggestion if sound-folding is possible.
  */
     static void
-rescore_one(su, stp)
-    suginfo_T	*su;
-    suggest_T	*stp;
+rescore_one(suginfo_T *su, suggest_T *stp)
 {
     slang_T	*slang = stp->st_slang;
     char_u	sal_badword[MAXWLEN];
@@ -14159,9 +13979,7 @@
 #ifdef __BORLANDC__
 _RTLENTRYF
 #endif
-sug_compare(s1, s2)
-    const void	*s1;
-    const void	*s2;
+sug_compare(const void *s1, const void *s2)
 {
     suggest_T	*p1 = (suggest_T *)s1;
     suggest_T	*p2 = (suggest_T *)s2;
@@ -14183,10 +14001,10 @@
  * Returns the maximum score in the list or "maxscore" unmodified.
  */
     static int
-cleanup_suggestions(gap, maxscore, keep)
-    garray_T	*gap;
-    int		maxscore;
-    int		keep;		/* nr of suggestions to keep */
+cleanup_suggestions(
+    garray_T	*gap,
+    int		maxscore,
+    int		keep)		/* nr of suggestions to keep */
 {
     suggest_T   *stp = &SUG(*gap, 0);
     int		i;
@@ -14211,8 +14029,7 @@
  * Result is in allocated memory, NULL for an error.
  */
     char_u *
-eval_soundfold(word)
-    char_u	*word;
+eval_soundfold(char_u *word)
 {
     langp_T	*lp;
     char_u	sound[MAXWLEN];
@@ -14249,11 +14066,11 @@
  * 2. SAL items define a more advanced sound-folding (and much slower).
  */
     static void
-spell_soundfold(slang, inword, folded, res)
-    slang_T	*slang;
-    char_u	*inword;
-    int		folded;	    /* "inword" is already case-folded */
-    char_u	*res;
+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;
@@ -14286,10 +14103,7 @@
  * SOFOTO lines.
  */
     static void
-spell_soundfold_sofo(slang, inword, res)
-    slang_T	*slang;
-    char_u	*inword;
-    char_u	*res;
+spell_soundfold_sofo(slang_T *slang, char_u *inword, char_u *res)
 {
     char_u	*s;
     int		ri = 0;
@@ -14360,10 +14174,7 @@
 }
 
     static void
-spell_soundfold_sal(slang, inword, res)
-    slang_T	*slang;
-    char_u	*inword;
-    char_u	*res;
+spell_soundfold_sal(slang_T *slang, char_u *inword, char_u *res)
 {
     salitem_T	*smp;
     char_u	word[MAXWLEN];
@@ -14641,10 +14452,7 @@
  * Multi-byte version of spell_soundfold().
  */
     static void
-spell_soundfold_wsal(slang, inword, res)
-    slang_T	*slang;
-    char_u	*inword;
-    char_u	*res;
+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];
@@ -14960,9 +14768,9 @@
  * avoiding checks that will not be possible.
  */
     static int
-soundalike_score(goodstart, badstart)
-    char_u	*goodstart;	/* sound-folded good word */
-    char_u	*badstart;	/* sound-folded bad word */
+soundalike_score(
+    char_u	*goodstart,	/* sound-folded good word */
+    char_u	*badstart)	/* sound-folded bad word */
 {
     char_u	*goodsound = goodstart;
     char_u	*badsound = badstart;
@@ -15195,10 +15003,10 @@
  * support multi-byte characters.
  */
     static int
-spell_edit_score(slang, badword, goodword)
-    slang_T	*slang;
-    char_u	*badword;
-    char_u	*goodword;
+spell_edit_score(
+    slang_T	*slang,
+    char_u	*badword,
+    char_u	*goodword)
 {
     int		*cnt;
     int		badlen, goodlen;	/* lengths including NUL */
@@ -15327,11 +15135,11 @@
  * for multi-byte characters.
  */
     static int
-spell_edit_score_limit(slang, badword, goodword, limit)
-    slang_T	*slang;
-    char_u	*badword;
-    char_u	*goodword;
-    int		limit;
+spell_edit_score_limit(
+    slang_T	*slang,
+    char_u	*badword,
+    char_u	*goodword,
+    int		limit)
 {
     limitscore_T    stack[10];		/* allow for over 3 * 2 edits */
     int		    stackidx;
@@ -15509,11 +15317,11 @@
  * Keep it in sync with the above!
  */
     static int
-spell_edit_score_limit_w(slang, badword, goodword, limit)
-    slang_T	*slang;
-    char_u	*badword;
-    char_u	*goodword;
-    int		limit;
+spell_edit_score_limit_w(
+    slang_T	*slang,
+    char_u	*badword,
+    char_u	*goodword,
+    int		limit)
 {
     limitscore_T    stack[10];		/* allow for over 3 * 2 edits */
     int		    stackidx;
@@ -15698,8 +15506,7 @@
  * ":spellinfo"
  */
     void
-ex_spellinfo(eap)
-    exarg_T *eap UNUSED;
+ex_spellinfo(exarg_T *eap UNUSED)
 {
     int		lpi;
     langp_T	*lp;
@@ -15735,8 +15542,7 @@
  * ":spelldump"
  */
     void
-ex_spelldump(eap)
-    exarg_T *eap;
+ex_spelldump(exarg_T *eap)
 {
     char_u  *spl;
     long    dummy;
@@ -15772,11 +15578,11 @@
  * 2. When "pat" is not NULL: add matching words to insert mode completion.
  */
     void
-spell_dump_compl(pat, ic, dir, dumpflags_arg)
-    char_u	*pat;	    /* leading part of the word */
-    int		ic;	    /* ignore case */
-    int		*dir;	    /* direction for adding matches */
-    int		dumpflags_arg;	/* DUMPFLAG_* */
+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;
@@ -15973,14 +15779,14 @@
  * When "lnum" is zero add insert mode completion.
  */
     static void
-dump_word(slang, word, pat, dir, dumpflags, wordflags, lnum)
-    slang_T	*slang;
-    char_u	*word;
-    char_u	*pat;
-    int		*dir;
-    int		dumpflags;
-    int		wordflags;
-    linenr_T	lnum;
+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;
@@ -16063,14 +15869,14 @@
  * Return the updated line number.
  */
     static linenr_T
-dump_prefixes(slang, word, pat, dir, dumpflags, flags, startlnum)
-    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;
+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];
@@ -16179,9 +15985,7 @@
  * Uses the spell-checking word characters.
  */
     char_u *
-spell_to_word_end(start, win)
-    char_u  *start;
-    win_T   *win;
+spell_to_word_end(char_u *start, win_T *win)
 {
     char_u  *p = start;
 
@@ -16199,8 +16003,7 @@
  * Returns the column number of the word.
  */
     int
-spell_word_start(startcol)
-    int		startcol;
+spell_word_start(int startcol)
 {
     char_u	*line;
     char_u	*p;
@@ -16238,8 +16041,7 @@
 static int spell_expand_need_cap;
 
     void
-spell_expand_check_cap(col)
-    colnr_T col;
+spell_expand_check_cap(colnr_T col)
 {
     spell_expand_need_cap = check_need_cap(curwin->w_cursor.lnum, col);
 }
@@ -16251,10 +16053,10 @@
  * allocated strings.
  */
     int
-expand_spelling(lnum, pat, matchp)
-    linenr_T	lnum UNUSED;
-    char_u	*pat;
-    char_u	***matchp;
+expand_spelling(
+    linenr_T	lnum UNUSED,
+    char_u	*pat,
+    char_u	***matchp)
 {
     garray_T	ga;