permitopen_port
int permitopen_port(const char *);
int permitopen_port(const char *p);
if (arg == NULL || ((port = permitopen_port(arg)) < 0))
((port = permitopen_port(arg)) < 0)) {
if (cp == NULL || (port = permitopen_port(cp)) < 0)
if (cp == NULL || (port = permitopen_port(cp)) < 0)
if (arg == NULL || ((port = permitopen_port(arg)) < 0))