ObjFW  Diff

	size_t lenNew;
	ssize_t lenOld;

	if (_s->isUTF8)
		idx = of_string_utf8_get_position(_s->cString, idx,
		    _s->cStringLength);

	if (idx >= _s->cStringLength)
		@throw [OFOutOfRangeException exception];

	/* Shortcut if old and new character both are ASCII */
	if (character < 0x80 && !(_s->cString[idx] & 0x80)) {
		_s->hashed = false;
		_s->cString[idx] = character;
		return;