Function mbs_offset_to_chars

src/expr.c:215–222

Return the number of logical characters (possibly multibyte) that are in string S in the first OFS octets. Example in UTF-8: "\xE2\x9D\xA7" is "U+2767 ROTATED FLORAL HEART BULLET". In the string below, there are only two characters up to the first 4 bytes (The U+2767 which occupies 3 bytes and 'x'): mbs_count_to_offset ("\xE2\x9D\xA7xyz", 4) => 2 */

   up to the first 4 bytes (The U+2767 which occupies 3 bytes and 'x'):
      mbs_count_to_offset ("\xE2\x9D\xA7xyz", 4) => 2  */
static size_t
mbs_offset_to_chars (char const *s, size_t ofs)
{
  size_t c = 0;
  for (size_t d = 0; d < ofs && s[d]; d += mcel_scanz (s + d).len)
    c++;
  return c;
}