/*	$NetBSD: biz31.c,v 1.12 2006/12/14 17:09:43 christos 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)biz31.c	8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: biz31.c,v 1.12 2006/12/14 17:09:43 christos Exp $");
#endif /* not lint */

#include "tip.h"

#define MAXRETRY	3		/* sync up retry count */
#define DISCONNECT_CMD	"\21\25\11\24"	/* disconnection string */

static	void sigALRM(int);
static	int timeout = 0;
static	jmp_buf timeoutbuf;

static void echo(const char *);
static int detect(const char *);
static void flush(const char *);
static int bizsync(int);

/*
 * Dial up on a BIZCOMP Model 1031 with either
 * 	tone dialing (mod = "f")
 *	pulse dialing (mod = "w")
 */
static int
biz_dialer(char *num, const char *mod)
{
	int connected = 0;

	if (!bizsync(FD)) {
		logent(value(HOST), "", "biz", "out of sync");
		(void)printf("bizcomp out of sync\n");
		exit(0);
	}
	if (boolean(value(VERBOSE)))
		(void)printf("\nstarting call...");
	echo("#\rk$\r$\n");			/* disable auto-answer */
	echo("$>$.$ #\r");			/* tone/pulse dialing */
	echo(mod);
	echo("$\r$\n");
	echo("$>$.$ #\re$ ");			/* disconnection sequence */
	echo(DISCONNECT_CMD);
	echo("\r$\n$\r$\n");
	echo("$>$.$ #\rr$ ");			/* repeat dial */
	echo(num);
	echo("\r$\n");
	if (boolean(value(VERBOSE)))
		(void)printf("ringing...");
	/*
	 * The reply from the BIZCOMP should be:
	 *	`^G NO CONNECTION\r\n^G\r\n'	failure
	 *	` CONNECTION\r\n^G'		success
	 */
	connected = detect(" ");
	if (!connected)
		flush(" NO CONNECTION\r\n\07\r\n");
	else
		flush("CONNECTION\r\n\07");
	if (timeout)
		biz31_disconnect();	/* insurance */
	return (connected);
}

int
/*ARGSUSED*/
biz31w_dialer(char *num, char *acu __unused)
{

	return (biz_dialer(num, "w"));
}

int
/*ARGSUSED*/
biz31f_dialer(char *num, char *acu __unused)
{

	return (biz_dialer(num, "f"));
}

void
biz31_disconnect(void)
{

	(void)write(FD, DISCONNECT_CMD, 4);
	(void)sleep(2);
	(void)tcflush(FD, TCIOFLUSH);
}

void
biz31_abort(void)
{

	(void)write(FD, "\33", 1);
}

static void
echo(const char *s)
{
	char c;

	while ((c = *s++) != '\0')
		switch (c) {
		case '$':
			(void)read(FD, &c, 1);
			s++;
			break;
			
		case '#':
			c = *s++;
			(void)write(FD, &c, 1);
			break;
			
		default:
			(void)write(FD, &c, 1);
			(void)read(FD, &c, 1);
		}
}

static void
/*ARGSUSED*/
sigALRM(int signo __unused)
{

	timeout = 1;
	longjmp(timeoutbuf, 1);
}

static int
detect(const char *s)
{
	sig_t f;
	char c;

	f = signal(SIGALRM, sigALRM);
	timeout = 0;
	while (*s) {
		if (setjmp(timeoutbuf)) {
			(void)printf("\07timeout waiting for reply\n");
			biz31_abort();
			break;
		}
		(void)alarm((unsigned)number(value(DIALTIMEOUT)));
		(void)read(FD, &c, 1);
		(void)alarm(0);
		if (c != *s++)
			break;
	}
	(void)signal(SIGALRM, f);
	return (timeout == 0);
}

static void
flush(const char *s)
{
	sig_t f;
	char c;

	f = signal(SIGALRM, sigALRM);
	while (*s++) {
		if (setjmp(timeoutbuf))
			break;
		(void)alarm(10);
		(void)read(FD, &c, 1);
		(void)alarm(0);
	}
	(void)signal(SIGALRM, f);
	timeout = 0;			/* guard against disconnection */
}

/*
 * This convoluted piece of code attempts to get
 *  the bizcomp in sync.  If you don't have the capacity or nread
 *  call there are gory ways to simulate this.
 */
static int
bizsync(int fd)
{
#ifdef FIOCAPACITY
	struct capacity b;
#	define chars(b)	((b).cp_nbytes)
#	define IOCTL	FIOCAPACITY
#endif
#ifdef FIONREAD
	long b;
#	define chars(b)	(b)
#	define IOCTL	FIONREAD
#endif
	int already = 0;
	char buf[10];

retry:
	if (ioctl(fd, IOCTL, &b) >= 0 && chars(b) > 0)
		(void)tcflush(FD, TCIOFLUSH);
	(void)write(fd, "\rp>\r", 4);
	(void)sleep(1);
	if (ioctl(fd, IOCTL, &b) >= 0) {
		if (chars(b) != 10) {
	nono:
			if (already > MAXRETRY)
				return (0);
			(void)write(fd, DISCONNECT_CMD, 4);
			(void)sleep(2);
			already++;
			goto retry;
		} else {
			(void)read(fd, buf, 10);
			if (strncmp(buf, "p >\r\n\r\n>", 8))
				goto nono;
		}
	}
	return (1);
}