refactor: Replace vim_strrchr() with strrchar() (#8718)

ref #1474

src/nvim/edit.c

@@ -6398,8 +6398,10 @@ stuff_inserted (
   /* may want to stuff the command character, to start Insert mode */
   if (c != NUL)
     stuffcharReadbuff(c);
-  if ((esc_ptr = (char_u *)vim_strrchr(ptr, ESC)) != NULL)
-    *esc_ptr = NUL;         /* remove the ESC */
+  if ((esc_ptr = STRRCHR(ptr, ESC)) != NULL) {
+    // remove the ESC.
+    *esc_ptr = NUL;
+  }
 
   /* when the last char is either "0" or "^" it will be quoted if no ESC
    * comes after it OR if it will inserted more than once and "ptr"

src/nvim/ex_cmds.c

@@ -307,9 +307,12 @@ static int linelen(int *has_tab)
     ;
   save = *last;
   *last = NUL;
-  len = linetabsize(line);              /* get line length */
-  if (has_tab != NULL)                  /* check for embedded TAB */
-    *has_tab = (vim_strrchr(first, TAB) != NULL);
+  // Get line length.
+  len = linetabsize(line);
+  // Check for embedded TAB.
+  if (has_tab != NULL) {
+    *has_tab = STRRCHR(first, TAB) != NULL;
+  }
   *last = save;
 
   return len;
@@ -5016,8 +5019,8 @@ void fix_help_buffer(void)
                 if (fnamencmp(f1, f2, t1 - f1) != 0) {
                   continue;
                 }
-                const char_u *const e1 = vim_strrchr(t1, '.');
-                const char_u *const e2 = vim_strrchr(path_tail(f2), '.');
+                const char_u *const e1 = STRRCHR(t1, '.');
+                const char_u *const e2 = STRRCHR(path_tail(f2), '.');
                 if (e1 == NULL || e2 == NULL) {
                   continue;
                 }

src/nvim/ex_docmd.c

@@ -8607,11 +8607,14 @@ eval_vars (
       break;
     }
 
-    resultlen = STRLEN(result);         /* length of new string */
-    if (src[*usedlen] == '<') {         /* remove the file name extension */
-      ++*usedlen;
-      if ((s = vim_strrchr(result, '.')) != NULL && s >= path_tail(result))
+    // Length of new string.
+    resultlen = STRLEN(result);
+    // Remove the file name extension.
+    if (src[*usedlen] == '<') {
+      (*usedlen)++;
+      if ((s = STRRCHR(result, '.')) != NULL && s >= path_tail(result)) {
         resultlen = (size_t)(s - result);
+      }
     } else if (!skip_mod) {
       valid |= modify_fname(src, usedlen, &result, &resultbuf, &resultlen);
       if (result == NULL) {

src/nvim/path.c

@@ -1770,7 +1770,7 @@ void path_fix_case(char_u *name)
   }
 
   // Open the directory where the file is located.
-  char_u *slash = vim_strrchr(name, '/');
+  char_u *slash = STRRCHR(name, '/');
   char_u *tail;
   Directory dir;
   bool ok;
@@ -2213,10 +2213,10 @@ static int path_to_absolute(const char_u *fname, char_u *buf, size_t len,
 
   // expand it if forced or not an absolute path
   if (force || !path_is_absolute(fname)) {
-    p = vim_strrchr(fname, '/');
+    p = STRRCHR(fname, '/');
 #ifdef WIN32
     if (p == NULL) {
-      p = vim_strrchr(fname, '\\');
+      p = STRRCHR(fname, '\\');
     }
 #endif
     if (p != NULL) {

src/nvim/spellfile.c

@@ -880,9 +880,10 @@ void suggest_load_files(void)
       // don't try again and again.
       slang->sl_sugloaded = true;
 
-      dotp = vim_strrchr(slang->sl_fname, '.');
-      if (dotp == NULL || fnamecmp(dotp, ".spl") != 0)
+      dotp = STRRCHR(slang->sl_fname, '.');
+      if (dotp == NULL || fnamecmp(dotp, ".spl") != 0) {
         continue;
+      }
       STRCPY(dotp, ".sug");
       fd = mch_fopen((char *)slang->sl_fname, "r");
       if (fd == NULL)

src/nvim/strings.c

@@ -455,25 +455,6 @@ char_u *vim_strchr(const char_u *const string, const int c)
   }
 }
 
-/*
- * Search for last occurrence of "c" in "string".
- * Return NULL if not found.
- * Does not handle multi-byte char for "c"!
- */
-char_u *vim_strrchr(const char_u *string, int c)
-  FUNC_ATTR_NONNULL_ALL FUNC_ATTR_PURE
-{
-  const char_u *retval = NULL;
-  const char_u *p = string;
-
-  while (*p) {
-    if (*p == c)
-      retval = p;
-    MB_PTR_ADV(p);
-  }
-  return (char_u *) retval;
-}
-
 /*
  * Sort an array of strings.
  */

src/nvim/vim.h

@@ -207,7 +207,7 @@ enum { FOLD_TEXT_LEN = 51 };  //!< buffer size for get_foldtext()
 
 
 // defines to avoid typecasts from (char_u *) to (char *) and back
-// (vim_strchr() and vim_strrchr() are now in alloc.c)
+// (vim_strchr() is now in strings.c)
 
 #define STRLEN(s)           strlen((char *)(s))
 #define STRCPY(d, s)        strcpy((char *)(d), (char *)(s))
@@ -238,6 +238,8 @@ enum { FOLD_TEXT_LEN = 51 };  //!< buffer size for get_foldtext()
 # endif
 #endif
 
+#define STRRCHR(s, c)       (char_u *)strrchr((const char *)(s), (c))
+
 #define STRCAT(d, s)        strcat((char *)(d), (char *)(s))
 #define STRNCAT(d, s, n)    strncat((char *)(d), (char *)(s), (size_t)(n))
 #define STRLCAT(d, s, n)    xstrlcat((char *)(d), (char *)(s), (size_t)(n))