ttyin()	/* process response from /dev/tty (version 1) */
{
	char buf[BUFSIZ];
	FILE *efopen();
	static FILE *tty = NULL;

	if (tty == NULL)
		tty = efopen("/dev/tty", "r");
	if (fgets(buf, BUFSIZ, tty) == NULL || buf[0] == 'q')
		exit(0);
	else	/* ordinary line */
		return buf[0];
}