parse_index
index = parse_index(optarg, NULL);
index = parse_index(buf, lifname);
static int parse_index(const char *, char *);
if ((pindex = parse_index(buf, NULL)) == -1) {
extern bool_t parse_index(const char *s, const char *end_s,
(void) parse_index(index_string,
(void) parse_index(index_string,