Fixed some string functions to make them compatible with UTF-8 charset

src/core/wee-string.c

@@ -81,7 +81,7 @@ string_tolower (char *string)
     {
         if ((string[0] >= 'A') && (string[0] <= 'Z'))
             string[0] += ('a' - 'A');
-        string++;
+        string = utf8_next_char (string);
     }
 }
 
@@ -96,7 +96,7 @@ string_toupper (char *string)
     {
         if ((string[0] >= 'a') && (string[0] <= 'z'))
             string[0] -= ('a' - 'A');
-        string++;
+        string = utf8_next_char (string);
     }
 }
 
@@ -107,27 +107,19 @@ string_toupper (char *string)
 int
 string_strcasecmp (char *string1, char *string2)
 {
-    int c1, c2;
+    int diff;
     
     if (!string1 || !string2)
         return (string1) ? 1 : ((string2) ? -1 : 0);
     
     while (string1[0] && string2[0])
     {
-        c1 = (int)((unsigned char) string1[0]);
-        c2 = (int)((unsigned char) string2[0]);
-        
-        if ((c1 >= 'A') && (c1 <= 'Z'))
-            c1 += ('a' - 'A');
-        
-        if ((c2 >= 'A') && (c2 <= 'Z'))
-            c2 += ('a' - 'A');
-        
-        if ((c1 - c2) != 0)
-            return c1 - c2;
-        
-        string1++;
-        string2++;
+        diff = utf8_charcasecmp (string1, string2);
+        if (diff != 0)
+            return diff;
+
+        string1 = utf8_next_char (string1);
+        string2 = utf8_next_char (string2);
     }
     
     return (string1[0]) ? 1 : ((string2[0]) ? -1 : 0);
@@ -141,7 +133,7 @@ string_strcasecmp (char *string1, char *string2)
 int
 string_strncasecmp (char *string1, char *string2, int max)
 {
-    int c1, c2, count;
+    int count, diff;
     
     if (!string1 || !string2)
         return (string1) ? 1 : ((string2) ? -1 : 0);
@@ -149,20 +141,12 @@ string_strncasecmp (char *string1, char *string2, int max)
     count = 0;
     while ((count < max) && string1[0] && string2[0])
     {
-        c1 = (int)((unsigned char) string1[0]);
-        c2 = (int)((unsigned char) string2[0]);
+        diff = utf8_charcasecmp (string1, string2);
+        if (diff != 0)
+            return diff;
         
-        if ((c1 >= 'A') && (c1 <= 'Z'))
-            c1 += ('a' - 'A');
-        
-        if ((c2 >= 'A') && (c2 <= 'Z'))
-            c2 += ('a' - 'A');
-        
-        if ((c1 - c2) != 0)
-            return c1 - c2;
-        
-        string1++;
-        string2++;
+        string1 = utf8_next_char (string1);
+        string2 = utf8_next_char (string2);
         count++;
     }
     

src/core/wee-utf8.c

@@ -315,6 +315,52 @@ utf8_strlen_screen (char *string)
     return length;
 }
 
+/*
+ * utf8_charcasecmp: compare two utf8 chars (case is ignored)
+ */
+
+int
+utf8_charcasecmp (char *string1, char *string2)
+{
+    int length1, length2, i, char1, char2, diff;
+    
+    if (!string1 || !string2)
+        return (string1) ? 1 : ((string2) ? -1 : 0);
+    
+    length1 = utf8_char_size (string1);
+    length2 = utf8_char_size (string2);
+    
+    char1 = (int)((unsigned char) string1[0]);
+    char2 = (int)((unsigned char) string2[0]);
+    
+    if ((char1 >= 'A') && (char1 <= 'Z'))
+        char1 += ('a' - 'A');
+    
+    if ((char2 >= 'A') && (char2 <= 'Z'))
+        char2 += ('a' - 'A');
+    
+    diff = char1 - char2;
+    if (diff != 0)
+        return diff;
+    
+    i = 1;
+    while ((i < length1) && (i < length2))
+    {
+        diff = (int)((unsigned char) string1[0]) - (int)((unsigned char) string2[0]);
+        if (diff != 0)
+            return diff;
+        i++;
+    }
+    // string1 == string2 ?
+    if ((i == length1) && (i == length2))
+        return 0;
+    // string1 < string2 ?
+    if (i == length1)
+        return 1;
+    // string1 > string2
+    return -1;
+}
+
 /*
  * utf8_char_size_screen: return number of chars needed on screen to display
  *                        UTF-8 char

src/core/wee-utf8.h

@@ -42,6 +42,7 @@ extern int utf8_char_size (char *);
 extern int utf8_strlen (char *);
 extern int utf8_strnlen (char *, int);
 extern int utf8_strlen_screen (char *);
+extern int utf8_charcasecmp (char *, char *);
 extern int utf8_char_size_screen (char *);
 extern char *utf8_add_offset (char *, int);
 extern int utf8_real_pos (char *, int);