lint: fix clint errors around mb_tolower calls

src/nvim/edit.c

@@ -2303,8 +2303,9 @@ static void ins_compl_longest_match(compl_T *match)
         c2 = *s;
       }
       if (match->cp_icase ? (mb_tolower(c1) != mb_tolower(c2))
-          : (c1 != c2))
+          : (c1 != c2)) {
         break;
+      }
       if (has_mbyte) {
         mb_ptr_adv(p);
         mb_ptr_adv(s);

src/nvim/eval.c

@@ -16792,7 +16792,8 @@ void timer_teardown(void)
 static void f_tolower(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 {
   rettv->v_type = VAR_STRING;
-  rettv->vval.v_string = (char_u *)strcase_save(tv_get_string(&argvars[0]), false);
+  rettv->vval.v_string = (char_u *)strcase_save(tv_get_string(&argvars[0]),
+                                                false);
 }
 
 /*
@@ -16801,7 +16802,8 @@ static void f_tolower(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 static void f_toupper(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 {
   rettv->v_type = VAR_STRING;
-  rettv->vval.v_string = (char_u *)strcase_save(tv_get_string(&argvars[0]), true);
+  rettv->vval.v_string = (char_u *)strcase_save(tv_get_string(&argvars[0]),
+                                                true);
 }
 
 /*

src/nvim/mbyte.c

@@ -1179,10 +1179,8 @@ int utf_fold(int a)
 // invalid values or can't handle latin1 when the locale is C.
 // Speed is most important here.
 
-/*
+/// Return the upper-case equivalent of "a", which is a UCS-4 character.  Use
- * Return the upper-case equivalent of "a", which is a UCS-4 character.  Use
+/// simple case folding.
- * simple case folding.
- */
 int mb_toupper(int a)
 {
   /* If 'casemap' contains "keepascii" use ASCII style toupper(). */
@@ -1205,14 +1203,12 @@ int mb_toupper(int a)
 
 bool mb_islower(int a)
 {
-  /* German sharp s is lower case but has no upper case equivalent. */
+  // German sharp s is lower case but has no upper case equivalent.
   return (mb_toupper(a) != a) || a == 0xdf;
 }
 
-/*
+/// Return the lower-case equivalent of "a", which is a UCS-4 character.  Use
- * Return the lower-case equivalent of "a", which is a UCS-4 character.  Use
+/// simple case folding.
- * simple case folding.
- */
 int mb_tolower(int a)
 {
   /* If 'casemap' contains "keepascii" use ASCII style tolower(). */

src/nvim/message.c

@@ -2730,7 +2730,7 @@ do_dialog (
         break;
       }
 
-      /* Make the character lowercase, as chars in "hotkeys" are. */
+      // Make the character lowercase, as chars in "hotkeys" are.
       c = mb_tolower(c);
       retval = 1;
       for (i = 0; hotkeys[i]; ++i) {

src/nvim/ops.c

@@ -1957,16 +1957,18 @@ int swapchar(int op_type, pos_T *pos)
     return FALSE;
   nc = c;
   if (mb_islower(c)) {
-    if (op_type == OP_ROT13)
+    if (op_type == OP_ROT13) {
       nc = ROT13(c, 'a');
-    else if (op_type != OP_LOWER)
+    } else if (op_type != OP_LOWER) {
       nc = mb_toupper(c);
+    }
   } else if (mb_isupper(c)) {
-    if (op_type == OP_ROT13)
+    if (op_type == OP_ROT13) {
       nc = ROT13(c, 'A');
-    else if (op_type != OP_UPPER)
+    } else if (op_type != OP_UPPER) {
       nc = mb_tolower(c);
     }
+  }
   if (nc != c) {
     if (enc_utf8 && (c >= 0x80 || nc >= 0x80)) {
       pos_T sp = curwin->w_cursor;
@@ -3328,9 +3330,10 @@ void ex_display(exarg_T *eap)
     get_clipboard(name, &yb, true);
 
     if (name == mb_tolower(redir_reg)
-        || (redir_reg == '"' && yb == y_previous))
+        || (redir_reg == '"' && yb == y_previous)) {
-      continue;             /* do not list register being written to, the
+      continue;  // do not list register being written to, the
-                             * pointer can be freed */
+                 // pointer can be freed
+    }
 
     if (yb->y_array != NULL) {
       msg_putchar('\n');

src/nvim/path.c

@@ -1865,7 +1865,7 @@ int pathcmp(const char *p, const char *q, int maxlen)
       if (vim_ispathsep(c2))
         return 1;
       return p_fic ? mb_toupper(c1) - mb_toupper(c2)
-             : c1 - c2;         /* no match */
+                   : c1 - c2;  // no match
     }
 
     i += MB_PTR2LEN((char_u *)p + i);

src/nvim/regexp.c

@@ -4573,12 +4573,14 @@ regmatch (
           if (OP(next) == EXACTLY) {
             rst.nextb = *OPERAND(next);
             if (ireg_ic) {
-              if (mb_isupper(rst.nextb))
+              if (mb_isupper(rst.nextb)) {
                 rst.nextb_ic = mb_tolower(rst.nextb);
-              else
+              } else {
                 rst.nextb_ic = mb_toupper(rst.nextb);
-            } else
+              }
+            } else {
               rst.nextb_ic = rst.nextb;
+            }
           } else {
             rst.nextb = NUL;
             rst.nextb_ic = NUL;
@@ -6312,14 +6314,15 @@ static char_u *cstrchr(char_u *s, int c)
   /* tolower() and toupper() can be slow, comparing twice should be a lot
    * faster (esp. when using MS Visual C++!).
    * For UTF-8 need to use folded case. */
-  if (enc_utf8 && c > 0x80)
+  if (c > 0x80) {
     cc = utf_fold(c);
-  else if (mb_isupper(c))
+  } else if (mb_isupper(c)) {
     cc = mb_tolower(c);
-  else if (mb_islower(c))
+  } else if (mb_islower(c)) {
     cc = mb_toupper(c);
-  else
+  } else {
     return vim_strchr(s, c);
+  }
 
   if (has_mbyte) {
     for (p = s; *p != NUL; p += (*mb_ptr2len)(p)) {

src/nvim/regexp_nfa.c

@@ -4391,8 +4391,9 @@ static int check_char_class(int class, int c)
       return OK;
     break;
   case NFA_CLASS_UPPER:
-    if (mb_isupper(c))
+    if (mb_isupper(c)) {
       return OK;
+    }
     break;
   case NFA_CLASS_XDIGIT:
     if (ascii_isxdigit(c))
@@ -5586,17 +5587,19 @@ static int nfa_regmatch(nfa_regprog_T *prog, nfa_state_T *start,
             }
             if (ireg_ic) {
               int curc_low = mb_tolower(curc);
-              int done = FALSE;
+              int done = false;
 
-              for (; c1 <= c2; ++c1)
+              for (; c1 <= c2; c1++) {
                 if (mb_tolower(c1) == curc_low) {
                   result = result_if_matched;
                   done = TRUE;
                   break;
                 }
-              if (done)
+              }
+              if (done) {
                 break;
               }
+            }
           } else if (state->c < 0 ? check_char_class(state->c, curc)
                      : (curc == state->c
                         || (ireg_ic && mb_tolower(curc)
@@ -6003,8 +6006,9 @@ static int nfa_regmatch(nfa_regprog_T *prog, nfa_state_T *start,
 #endif
         result = (c == curc);
 
-        if (!result && ireg_ic)
+        if (!result && ireg_ic) {
           result = mb_tolower(c) == mb_tolower(curc);
+        }
 
         // If ireg_icombine is not set only skip over the character
         // itself.  When it is set skip over composing characters.

src/nvim/search.c

@@ -335,23 +335,26 @@ int pat_has_uppercase(char_u *pat)
   while (*p != NUL) {
     int l;
 
-    if (has_mbyte && (l = (*mb_ptr2len)(p)) > 1) {
+    if ((l = mb_ptr2len(p)) > 1) {
-      if (enc_utf8 && mb_isupper(utf_ptr2char(p)))
+      if (mb_isupper(utf_ptr2char(p))) {
-        return TRUE;
+        return true;
+      }
       p += l;
     } else if (*p == '\\') {
-      if (p[1] == '_' && p[2] != NUL)        /* skip "\_X" */
+      if (p[1] == '_' && p[2] != NUL) {  // skip "\_X"
         p += 3;
-      else if (p[1] == '%' && p[2] != NUL)        /* skip "\%X" */
+      } else if (p[1] == '%' && p[2] != NUL) {  // skip "\%X"
         p += 3;
-      else if (p[1] != NUL)        /* skip "\X" */
+      } else if (p[1] != NUL) {  // skip "\X"
         p += 2;
-      else
+      } else {
         p += 1;
-    } else if (mb_isupper(*p))
+      }
-      return TRUE;
+    } else if (mb_isupper(*p)) {
-    else
+      return true;
-      ++p;
+    } else {
+      p++;
+    }
   }
   return FALSE;
 }

src/nvim/spell.c

@@ -2526,8 +2526,7 @@ void clear_spell_chartab(spelltab_T *sp)
   }
 }
 
-// Init the chartab used for spelling.  Only depends on 'encoding'.
+// Init the chartab used for spelling. Called once while starting up.
-// 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.
@@ -2537,13 +2536,7 @@ void init_spell_chartab(void)
 
   did_set_spelltab = false;
   clear_spell_chartab(&spelltab);
-  if (enc_dbcs) {
+  for (i = 128; i < 256; i++) {
-    // 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 = mb_toupper(i);
 
@@ -2555,19 +2548,6 @@ void init_spell_chartab(void)
     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);
-      }
-    }
-  }
 }
 
 /// Returns true if "p" points to a word character.