Add string compare functions

src/String/String.c

@@ -1,4 +1,5 @@
 #include <BH/String.h>
+#include <BH/Unicode.h>
 #include <string.h>
 #include <stdlib.h>
 
@@ -17,3 +18,31 @@ char *BH_StringDup(const char *string)
         memcpy(result, string, length);
     return result;
 }
+
+
+int BH_StringCompare(const char *s1,
+                     const char *s2)
+{
+    return strcmp(s1, s2);
+}
+
+
+int BH_StringCompareCaseless(const char *s1,
+                             const char *s2)
+{
+    uint32_t c1, c2;
+
+    while (*s1 && *s2)
+    {
+        s1 += BH_UnicodeDecodeUtf8(s1, 4, &c1);
+        s2 += BH_UnicodeDecodeUtf8(s2, 4, &c2);
+
+        c1 = BH_UnicodeLower(c1);
+        c2 = BH_UnicodeLower(c2);
+
+        if (c1 != c2)
+            return (c1 < c2) ? -1 : 1;
+    }
+
+    return (!*s1) ? (!*s2 ? 0 : -1) : 1;
+}