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Fixup example files, man pages and phones parsing.

Make '/etc/remote' a working example, with some lengthy comments that
might help people trying to use it.

Remove untruths and beef up documentation for tip(1), remote(5) and
phones(5). In particular remove last reference to the 'cu' tip
interface since we use the 'cu' that comes with uucp, improve
documentation on phone numbers and flesh out documentation on
acu/modems supported. Document PHONES and REMOTE environment
variables.

Cleanup parsing of /etc/phones (so our example can be used) and ignore
lines with empty phone numbers instead of aborting the scan of the
file. This makes /etc/phones parsing consistant with ':pn:' capability
parsing. Don't try to dial empty phone numbers in either case.

ok millert@

/*	$OpenBSD: acu.c,v 1.6 2001/08/11 00:05:53 krw Exp $	*/
/*	$NetBSD: acu.c,v 1.4 1996/12/29 10:34:03 cgd Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
#if 0
static char sccsid[] = "@(#)acu.c	8.1 (Berkeley) 6/6/93";
#endif
static char rcsid[] = "$OpenBSD: acu.c,v 1.6 2001/08/11 00:05:53 krw Exp $";
#endif /* not lint */

#include "tip.h"

static acu_t *acu = NOACU;
static int conflag;
static void acuabort();
static acu_t *acutype();
static jmp_buf jmpbuf;
/*
 * Establish connection for tip
 *
 * If DU is true, we should dial an ACU whose type is AT.
 * The phone numbers are in PN, and the call unit is in CU.
 *
 * If the PN is an '@', then we consult the PHONES file for
 *   the phone numbers.  This file is /etc/phones, unless overriden
 *   by an exported shell variable.
 *
 * The data base files must be in the format:
 *	host-name[ \t]*phone-number
 *   with the possibility of multiple phone numbers
 *   for a single host acting as a rotary (in the order
 *   found in the file).
 */
char *
connect()
{
	register char *cp = PN;
	char *phnum, string[256];
	FILE *fd;
	volatile int tried = 0;

	if (!DU) {		/* regular connect message */
		if (CM != NOSTR)
			parwrite(FD, CM, size(CM));
		logent(value(HOST), "", DV, "call completed");
		return (NOSTR);
	}
	/*
	 * @ =>'s use data base in PHONES environment variable
	 *        otherwise, use /etc/phones
	 */
	signal(SIGINT, acuabort);
	signal(SIGQUIT, acuabort);
	if (setjmp(jmpbuf)) {
		signal(SIGINT, SIG_IGN);
		signal(SIGQUIT, SIG_IGN);
		printf("\ncall aborted\n");
		logent(value(HOST), "", "", "call aborted");
		if (acu != NOACU) {
			setboolean(value(VERBOSE), FALSE);
			if (conflag)
				disconnect(NOSTR);
			else
				(*acu->acu_abort)();
		}
		return ("interrupt");
	}
	if ((acu = acutype(AT)) == NOACU)
		return ("unknown ACU type");
	if (*cp != '@') {
		while (*cp) {
			phnum = cp;
			cp = strpbrk(cp, ",");
			if (*cp != '\0')
				*cp++ = '\0';

			if (strlen(phnum) == 0)
				continue;

			conflag = (*acu->acu_dialer)(phnum, CU);
			if (conflag)
				break;

			logent(value(HOST), phnum, acu->acu_name, "call failed");
			tried++;
		}
	} else {
		if ((fd = fopen(PH, "r")) == NOFILE) {
			printf("%s: ", PH);
			return ("can't open phone number file");
		}
		while (fgets(string, sizeof(string), fd) != NOSTR) {
			cp = &string[strcspn(string, " \t\n")];
			if (*cp != '\0')
				*cp++ = '\0';

			if (strcmp(string, value(HOST)) != 0)
				continue;

			cp += strspn(cp, " \t\n");
			phnum = cp;
			*(cp + strcspn(cp, ",\n")) = '\0';

			if (strlen(phnum) == 0)
				continue;

			conflag = (*acu->acu_dialer)(phnum, CU);
			if (conflag)
				break;
			
			logent(value(HOST), phnum, acu->acu_name, "call failed");
			tried++;
		}
		fclose(fd);
	}
	if (conflag) {
		if (CM != NOSTR)
			parwrite(FD, CM, size(CM));
		logent(value(HOST), phnum, acu->acu_name, "call completed");
		return (NOSTR);
	} else if (!tried) {
		logent(value(HOST), "", acu->acu_name, "missing phone number");
		return ("missing phone number");
	} else {
		(*acu->acu_abort)();
		return ("call failed");
	}
}

void
disconnect(reason)
	char *reason;
{
	if (!conflag) {
		logent(value(HOST), "", DV, "call terminated");
		return;
	}
	if (reason == NOSTR) {
		logent(value(HOST), "", acu->acu_name, "call terminated");
		if (boolean(value(VERBOSE)))
			printf("\r\ndisconnecting...");
	} else 
		logent(value(HOST), "", acu->acu_name, reason);
	(*acu->acu_disconnect)();
}

static void
acuabort(s)
{
	signal(s, SIG_IGN);
	longjmp(jmpbuf, 1);
}

static acu_t *
acutype(s)
	register char *s;
{
	register acu_t *p;
	extern acu_t acutable[];

	for (p = acutable; p->acu_name != '\0'; p++)
		if (!strcmp(s, p->acu_name))
			return (p);
	return (NOACU);
}