--- a/src/if_cscope.c
+++ b/src/if_cscope.c
@@ -83,8 +83,7 @@ static cscmd_T	    cs_cmds[] =
 };
 
     static void
-cs_usage_msg(x)
-    csid_e x;
+cs_usage_msg(csid_e x)
 {
     (void)EMSG2(_("E560: Usage: cs[cope] %s"), cs_cmds[(int)x].usage);
 }
@@ -104,9 +103,7 @@ static enum
  * expansion.
  */
     char_u *
-get_cscope_name(xp, idx)
-    expand_T	*xp UNUSED;
-    int		idx;
+get_cscope_name(expand_T *xp UNUSED, int idx)
 {
     int		current_idx;
     int		i;
@@ -167,10 +164,10 @@ get_cscope_name(xp, idx)
  * Handle command line completion for :cscope command.
  */
     void
-set_context_in_cscope_cmd(xp, arg, cmdidx)
-    expand_T	*xp;
-    char_u	*arg;
-    cmdidx_T	cmdidx;
+set_context_in_cscope_cmd(
+    expand_T	*xp,
+    char_u	*arg,
+    cmdidx_T	cmdidx)
 {
     char_u	*p;
 
@@ -210,9 +207,9 @@ set_context_in_cscope_cmd(xp, arg, cmdid
  * command function.
  */
     static void
-do_cscope_general(eap, make_split)
-    exarg_T	*eap;
-    int		make_split; /* whether to split window */
+do_cscope_general(
+    exarg_T	*eap,
+    int		make_split) /* whether to split window */
 {
     cscmd_T *cmdp;
 
@@ -248,8 +245,7 @@ do_cscope_general(eap, make_split)
  * PUBLIC: do_cscope
  */
     void
-do_cscope(eap)
-    exarg_T *eap;
+do_cscope(exarg_T *eap)
 {
     do_cscope_general(eap, FALSE);
 }
@@ -260,8 +256,7 @@ do_cscope(eap)
  * same as do_cscope, but splits window, too.
  */
     void
-do_scscope(eap)
-    exarg_T *eap;
+do_scscope(exarg_T *eap)
 {
     do_cscope_general(eap, TRUE);
 }
@@ -271,8 +266,7 @@ do_scscope(eap)
  *
  */
     void
-do_cstag(eap)
-    exarg_T *eap;
+do_cstag(exarg_T *eap)
 {
     int ret = FALSE;
 
@@ -354,9 +348,7 @@ do_cstag(eap)
  * returns TRUE if eof, FALSE otherwise
  */
     int
-cs_fgets(buf, size)
-    char_u	*buf;
-    int		size;
+cs_fgets(char_u *buf, int size)
 {
     char *p;
 
@@ -374,7 +366,7 @@ cs_fgets(buf, size)
  * called only from do_tag(), when popping the tag stack
  */
     void
-cs_free_tags()
+cs_free_tags(void)
 {
     cs_manage_matches(NULL, NULL, -1, Free);
 }
@@ -386,7 +378,7 @@ cs_free_tags()
  * called from do_tag()
  */
     void
-cs_print_tags()
+cs_print_tags(void)
 {
     cs_manage_matches(NULL, NULL, -1, Print);
 }
@@ -421,10 +413,7 @@ cs_print_tags()
  */
 #if defined(FEAT_EVAL) || defined(PROTO)
     int
-cs_connection(num, dbpath, ppath)
-    int num;
-    char_u *dbpath;
-    char_u *ppath;
+cs_connection(int num, char_u *dbpath, char_u *ppath)
 {
     int i;
 
@@ -486,8 +475,7 @@ cs_connection(num, dbpath, ppath)
  * MAXPATHL 256
  */
     static int
-cs_add(eap)
-    exarg_T *eap UNUSED;
+cs_add(exarg_T *eap UNUSED)
 {
     char *fname, *ppath, *flags = NULL;
 
@@ -503,8 +491,7 @@ cs_add(eap)
 }
 
     static void
-cs_stat_emsg(fname)
-    char *fname;
+cs_stat_emsg(char *fname)
 {
     char *stat_emsg = _("E563: stat(%s) error: %d");
     char *buf = (char *)alloc((unsigned)strlen(stat_emsg) + MAXPATHL + 10);
@@ -528,10 +515,10 @@ cs_stat_emsg(fname)
  * routine uses a number of goto statements.
  */
     static int
-cs_add_common(arg1, arg2, flags)
-    char *arg1;	    /* filename - may contain environment variables */
-    char *arg2;	    /* prepend path - may contain environment variables */
-    char *flags;
+cs_add_common(
+    char *arg1,	    /* filename - may contain environment variables */
+    char *arg2,	    /* prepend path - may contain environment variables */
+    char *flags)
 {
     struct stat statbuf;
     int		ret;
@@ -665,14 +652,14 @@ add_err:
 
 
     static int
-cs_check_for_connections()
+cs_check_for_connections(void)
 {
     return (cs_cnt_connections() > 0);
 } /* cs_check_for_connections */
 
 
     static int
-cs_check_for_tags()
+cs_check_for_tags(void)
 {
     return (p_tags[0] != NUL && curbuf->b_p_tags != NULL);
 } /* cs_check_for_tags */
@@ -684,7 +671,7 @@ cs_check_for_tags()
  * count the number of cscope connections
  */
     static int
-cs_cnt_connections()
+cs_cnt_connections(void)
 {
     short i;
     short cnt = 0;
@@ -698,8 +685,8 @@ cs_cnt_connections()
 } /* cs_cnt_connections */
 
     static void
-cs_reading_emsg(idx)
-    int idx;	/* connection index */
+cs_reading_emsg(
+    int idx)	/* connection index */
 {
     EMSGN(_("E262: error reading cscope connection %ld"), idx);
 }
@@ -711,8 +698,7 @@ cs_reading_emsg(idx)
  * count the number of matches for a given cscope connection.
  */
     static int
-cs_cnt_matches(idx)
-    int idx;
+cs_cnt_matches(int idx)
 {
     char *stok;
     char *buf;
@@ -773,9 +759,7 @@ cs_cnt_matches(idx)
  * Creates the actual cscope command query from what the user entered.
  */
     static char *
-cs_create_cmd(csoption, pattern)
-    char *csoption;
-    char *pattern;
+cs_create_cmd(char *csoption, char *pattern)
 {
     char *cmd;
     short search;
@@ -836,8 +820,7 @@ cs_create_cmd(csoption, pattern)
  * the BSD license notice?
  */
     static int
-cs_create_connection(i)
-    int i;
+cs_create_connection(int i)
 {
 #ifdef UNIX
     int		to_cs[2], from_cs[2];
@@ -1082,8 +1065,7 @@ err_closing:
  * returns TRUE if we jump to a tag or abort, FALSE if not.
  */
     static int
-cs_find(eap)
-    exarg_T *eap;
+cs_find(exarg_T *eap)
 {
     char *opt, *pat;
     int i;
@@ -1126,13 +1108,13 @@ cs_find(eap)
  * common code for cscope find, shared by cs_find() and do_cstag()
  */
     static int
-cs_find_common(opt, pat, forceit, verbose, use_ll, cmdline)
-    char *opt;
-    char *pat;
-    int forceit;
-    int verbose;
-    int	use_ll UNUSED;
-    char_u *cmdline UNUSED;
+cs_find_common(
+    char *opt,
+    char *pat,
+    int forceit,
+    int verbose,
+    int	use_ll UNUSED,
+    char_u *cmdline UNUSED)
 {
     int i;
     char *cmd;
@@ -1344,8 +1326,7 @@ cs_find_common(opt, pat, forceit, verbos
  * print help
  */
     static int
-cs_help(eap)
-    exarg_T *eap UNUSED;
+cs_help(exarg_T *eap UNUSED)
 {
     cscmd_T *cmdp = cs_cmds;
 
@@ -1382,8 +1363,7 @@ cs_help(eap)
 
 
     static void
-clear_csinfo(i)
-    int	    i;
+clear_csinfo(int i)
 {
     csinfo[i].fname  = NULL;
     csinfo[i].ppath  = NULL;
@@ -1408,7 +1388,7 @@ clear_csinfo(i)
 static char *GetWin32Error(void);
 
     static char *
-GetWin32Error()
+GetWin32Error(void)
 {
     char *msg = NULL;
     FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM,
@@ -1430,11 +1410,11 @@ GetWin32Error()
  * insert a new cscope database filename into the filelist
  */
     static int
-cs_insert_filelist(fname, ppath, flags, sb)
-    char *fname;
-    char *ppath;
-    char *flags;
-    struct stat *sb UNUSED;
+cs_insert_filelist(
+    char *fname,
+    char *ppath,
+    char *flags,
+    struct stat *sb UNUSED)
 {
     short	i, j;
 #ifndef UNIX
@@ -1577,8 +1557,7 @@ cs_insert_filelist(fname, ppath, flags, 
  * find cscope command in command table
  */
     static cscmd_T *
-cs_lookup_cmd(eap)
-    exarg_T *eap;
+cs_lookup_cmd(exarg_T *eap)
 {
     cscmd_T *cmdp;
     char *stok;
@@ -1609,8 +1588,7 @@ cs_lookup_cmd(eap)
  * nuke em
  */
     static int
-cs_kill(eap)
-    exarg_T *eap UNUSED;
+cs_kill(exarg_T *eap UNUSED)
 {
     char *stok;
     short i;
@@ -1667,9 +1645,9 @@ cs_kill(eap)
  * Actually kills a specific cscope connection.
  */
     static void
-cs_kill_execute(i, cname)
-    int i;	    /* cscope table index */
-    char *cname;    /* cscope database name */
+cs_kill_execute(
+    int i,	    /* cscope table index */
+    char *cname)    /* cscope database name */
 {
     if (p_csverbose)
     {
@@ -1702,11 +1680,11 @@ cs_kill_execute(i, cname)
  * characters to comply with ctags formatting.
  */
     static char *
-cs_make_vim_style_matches(fname, slno, search, tagstr)
-    char *fname;
-    char *slno;
-    char *search;
-    char *tagstr;
+cs_make_vim_style_matches(
+    char *fname,
+    char *slno,
+    char *search,
+    char *tagstr)
 {
     /* vim style is ctags:
      *
@@ -1762,11 +1740,11 @@ cs_make_vim_style_matches(fname, slno, s
  * Print: prints the tags
  */
     static char *
-cs_manage_matches(matches, contexts, totmatches, cmd)
-    char **matches;
-    char **contexts;
-    int totmatches;
-    mcmd_e cmd;
+cs_manage_matches(
+    char **matches,
+    char **contexts,
+    int totmatches,
+    mcmd_e cmd)
 {
     static char **mp = NULL;
     static char **cp = NULL;
@@ -1829,13 +1807,13 @@ cs_manage_matches(matches, contexts, tot
  * parse cscope output
  */
     static char *
-cs_parse_results(cnumber, buf, bufsize, context, linenumber, search)
-    int cnumber;
-    char *buf;
-    int bufsize;
-    char **context;
-    char **linenumber;
-    char **search;
+cs_parse_results(
+    int cnumber,
+    char *buf,
+    int bufsize,
+    char **context,
+    char **linenumber,
+    char **search)
 {
     int ch;
     char *p;
@@ -1892,9 +1870,7 @@ cs_parse_results(cnumber, buf, bufsize, 
  * write cscope find results to file
  */
     static void
-cs_file_results(f, nummatches_a)
-    FILE *f;
-    int *nummatches_a;
+cs_file_results(FILE *f, int *nummatches_a)
 {
     int i, j;
     char *buf;
@@ -1951,13 +1927,13 @@ cs_file_results(f, nummatches_a)
  * When there are no matches sets "*matches_p" to NULL.
  */
     static void
-cs_fill_results(tagstr, totmatches, nummatches_a, matches_p, cntxts_p, matched)
-    char *tagstr;
-    int totmatches;
-    int *nummatches_a;
-    char ***matches_p;
-    char ***cntxts_p;
-    int *matched;
+cs_fill_results(
+    char *tagstr,
+    int totmatches,
+    int *nummatches_a,
+    char ***matches_p,
+    char ***cntxts_p,
+    int *matched)
 {
     int i, j;
     char *buf;
@@ -2031,8 +2007,7 @@ parse_out:
 
 /* get the requested path components */
     static char *
-cs_pathcomponents(path)
-    char	*path;
+cs_pathcomponents(char *path)
 {
     int		i;
     char	*s;
@@ -2063,10 +2038,7 @@ cs_pathcomponents(path)
  * called from cs_manage_matches()
  */
     static void
-cs_print_tags_priv(matches, cntxts, num_matches)
-    char **matches;
-    char **cntxts;
-    int num_matches;
+cs_print_tags_priv(char **matches, char **cntxts, int num_matches)
 {
     char	*buf = NULL;
     char	*t_buf;
@@ -2212,8 +2184,7 @@ cs_print_tags_priv(matches, cntxts, num_
  * read a cscope prompt (basically, skip over the ">> ")
  */
     static int
-cs_read_prompt(i)
-    int i;
+cs_read_prompt(int i)
 {
     int		ch;
     char	*buf = NULL; /* buffer for possible error message from cscope */
@@ -2312,9 +2283,7 @@ sig_handler SIGDEFARG(sigarg)
  * or not to free the filename.  Called by cs_kill and cs_reset.
  */
     static void
-cs_release_csp(i, freefnpp)
-    int i;
-    int freefnpp;
+cs_release_csp(int i, int freefnpp)
 {
     /*
      * Trying to exit normally (not sure whether it is fit to UNIX cscope
@@ -2441,8 +2410,7 @@ cs_release_csp(i, freefnpp)
  * calls cs_kill on all cscope connections then reinits
  */
     static int
-cs_reset(eap)
-    exarg_T *eap UNUSED;
+cs_reset(exarg_T *eap UNUSED)
 {
     char	**dblist = NULL, **pplist = NULL, **fllist = NULL;
     int	i;
@@ -2514,9 +2482,7 @@ cs_reset(eap)
  * Contrast this with my development system (Digital Unix), which does.
  */
     static char *
-cs_resolve_file(i, name)
-    int  i;
-    char *name;
+cs_resolve_file(int i, char *name)
 {
     char	*fullname;
     int		len;
@@ -2580,8 +2546,7 @@ cs_resolve_file(i, name)
  * show all cscope connections
  */
     static int
-cs_show(eap)
-    exarg_T *eap UNUSED;
+cs_show(exarg_T *eap UNUSED)
 {
     short i;
     if (cs_cnt_connections() == 0)
@@ -2616,7 +2581,7 @@ cs_show(eap)
  * Only called when VIM exits to quit any cscope sessions.
  */
     void
-cs_end()
+cs_end(void)
 {
     int i;