mac_from_text
if (mac_from_text(pmac, value) != 0) {
if (mac_from_text(&label, label_string) == -1) {
if (mac_from_text(&label, val) == -1) {
int mac_from_text(mac_t *_label, const char *_text);
if (mac_from_text(&mac, macstr))
error = mac_from_text(&label, argv[1]);