ObjFW  Diff

	of_unichar_t c;
	size_t length, oldLength;

	if (s->UTF8)
		index = of_string_index_to_position(s->cString, index,
		    s->cStringLength);

	if (index > s->cStringLength)
		@throw [OFOutOfRangeException exceptionWithClass: [self class]];

	if (!(character & 0x80) && !(s->cString[index] & 0x80)) {
		s->hashed = NO;
		s->cString[index] = character;
		return;
	}

	if ((length = of_string_unicode_to_utf8(character, buffer)) == 0)