Delete unused UTF-8 related functions

Author: soutaro

include/rbs/string.h

@@ -44,6 +44,4 @@ size_t rbs_string_len(const rbs_string_t self);
  */
 bool rbs_string_equal(const rbs_string_t lhs, const rbs_string_t rhs);
 
-unsigned int rbs_utf8_string_to_codepoint(const rbs_string_t string);
-
 #endif

src/string.c

@@ -1,59 +1,10 @@
 #include "rbs/string.h"
-#include "rbs/defines.h"
 
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
 #include <ctype.h>
 
-unsigned int rbs_utf8_string_to_codepoint(const rbs_string_t string) {
-    unsigned int codepoint = 0;
-    int remaining_bytes = 0;
-
-    const char *s = string.start;
-    const char *end = string.end;
-
-    if (s >= end) return 0; // End of string
-
-    if (RBS_LIKELY((*s & 0x80) == 0)) {
-        // Single byte character (0xxxxxxx)
-        return *s;
-    } else if ((*s & 0xE0) == 0xC0) {
-        // Two byte character (110xxxxx 10xxxxxx)
-        codepoint = *s & 0x1F;
-        remaining_bytes = 1;
-    } else if ((*s & 0xF0) == 0xE0) {
-        // Three byte character (1110xxxx 10xxxxxx 10xxxxxx)
-        codepoint = *s & 0x0F;
-        remaining_bytes = 2;
-    } else if ((*s & 0xF8) == 0xF0) {
-        // Four byte character (11110xxx 10xxxxxx 10xxxxxx 10xxxxxx)
-        codepoint = *s & 0x07;
-        remaining_bytes = 3;
-    } else {
-        // Invalid UTF-8 sequence
-        return 0xFFFD; // Unicode replacement character
-    }
-
-    s++;
-    while (remaining_bytes > 0 && s < end) {
-        if ((*s & 0xC0) != 0x80) {
-            // Invalid continuation byte
-            return 0xFFFD;
-        }
-        codepoint = (codepoint << 6) | (*s & 0x3F);
-        s++;
-        remaining_bytes--;
-    }
-
-    if (remaining_bytes > 0) {
-        // Incomplete sequence
-        return 0xFFFD;
-    }
-
-    return codepoint;
-}
-
 rbs_string_t rbs_string_new(const char *start, const char *end) {
     return (rbs_string_t) {
         .start = start,

src/util/rbs_unescape.c

@@ -43,14 +43,6 @@ static int octal_to_int(const char *octal, int length) {
     return result;
 }
 
-int rbs_utf8_codelen(unsigned int c) {
-    if (c <= 0x7F) return 1;
-    if (c <= 0x7FF) return 2;
-    if (c <= 0xFFFF) return 3;
-    if (c <= 0x10FFFF) return 4;
-    return 1; // Invalid Unicode codepoint, treat as 1 byte
-}
-
 // Fills buf starting at index 'start' with the UTF-8 encoding of 'codepoint'.
 // Returns the number of bytes written, or 0 when the output is not changed.
 //