lookup_port
add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0x0000);
add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0xffff);
add_port(cnt, ptr, off, lookup_port(arg, 0, 0));
if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {
if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {