iface_lookup
struct iface *iface_lookup(struct area *, struct iface *);
if (iface_lookup(xa, i) == NULL) {
if ((i = iface_lookup(a, xi)) == NULL) {
struct iface *iface_lookup(struct area *, struct iface *);
if (iface_lookup(xa, i) == NULL) {
if ((i = iface_lookup(a, xi)) == NULL) {