rem: int ftos = string_to_number(s, 0, 255);
add: unsigned int ftos;  string_to_number(s, 0, 255, &ftos);
context: parse_ftos(const unsigned char *s, struct ipt_FTOS_info *finfo){	int ftos = string_to_number(s, 0, 255);    	finfo->ftos = (u_int8_t )ftos;    	return;}