[utf8] Adding a boolean struct member for string_script_t return values, set to true if the string is ASCII (no transliteration needed, should be frequent for English addresses)

src/unicode_scripts.c

@@ -2,6 +2,8 @@
 
 #include "unicode_scripts_data.c"
 
+#define MAX_ASCII 128
+
 inline script_t get_char_script(uint32_t ch) {
     if (ch > NUM_CODEPOINTS - 1) return SCRIPT_UNKNOWN;
     return char_scripts[ch];
@@ -21,6 +23,8 @@ string_script_t get_string_script(char *str, size_t len) {
     size_t script_len = 0;
     size_t idx = 0;
 
+    bool is_ascii = true;
+
     while (idx < len) {
         ssize_t char_len = utf8proc_iterate(ptr, -1, &ch);
 
@@ -36,6 +40,8 @@ string_script_t get_string_script(char *str, size_t len) {
             break;
         }
 
+        is_ascii = is_ascii && ch < MAX_ASCII;
+
         ptr += char_len;
         idx += char_len;
         script_len += char_len;
@@ -46,5 +52,5 @@ string_script_t get_string_script(char *str, size_t len) {
     
     }
 
-    return (string_script_t) {last_script, script_len};
+    return (string_script_t) {last_script, script_len, is_ascii};
 }