usage("[spec] Invalid width: \"%s\", for file \"%s\"\n", w, n);
if (!is_pos_num(t))
usage("[spec] Invalid TTL: \"%s\", for file \"%s\"\n", t, n);
usage("[spec] Invalid width: \"%s\", for file \"%s\"\n", w, n);
if (!is_pos_num(t))
usage("[spec] Invalid TTL: \"%s\", for file \"%s\"\n", t, n);