/*      $NetBSD: biz22.c,v 1.13 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[] = "@(#)biz22.c     8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: biz22.c,v 1.13 2006/12/14 17:09:43 christos Exp $");
#endif /* not lint */

#include "tip.h"

#define DISCONNECT_CMD  "\20\04"        /* disconnection string */

static  int btimeout = 0;
static  jmp_buf timeoutbuf;

static  int     biz_dialer(char *, const char *);
static  int     cmd(const char *);
static  int     detect(const char *);
static  void    sigALRM(int);

/*
 * Dial up on a BIZCOMP Model 1022 with either
 *      tone dialing (mod = "V")
 *      pulse dialing (mod = "W")
 */
static int
biz_dialer(char *num, const char *mod)
{
        int connected = 0;
        char cbuf[40];

        if (boolean(value(VERBOSE)))
                (void)printf("\nstarting call...");
        /*
         * Disable auto-answer and configure for tone/pulse
         *  dialing
         */
        if (cmd("\02K\r")) {
                (void)printf("can't initialize bizcomp...");
                return (0);
        }
        (void)strncpy(cbuf, "\02.\r", sizeof(cbuf) - 1);
        cbuf[1] = *mod;
        if (cmd(cbuf)) {
                (void)printf("can't set dialing mode...");
                return (0);
        }
        (void)snprintf(cbuf, sizeof cbuf, "\02D%s\r", num);
        (void)write(FD, cbuf, strlen(cbuf));
        if (!detect("7\r")) {
                (void)printf("can't get dial tone...");
                return (0);
        }
        if (boolean(value(VERBOSE)))
                (void)printf("ringing...");
        /*
         * The reply from the BIZCOMP should be:
         *      2 \r or 7 \r    failure
         *      1 \r            success
         */
        connected = detect("1\r");
        if (btimeout)
                biz22_disconnect();     /* insurance */
        return (connected);
}

int
/*ARGSUSED*/
biz22w_dialer(char *num, char *acu __unused)
{

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

int
/*ARGSUSED*/
biz22f_dialer(char *num, char *acu __unused)
{

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

void
biz22_disconnect(void)
{

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

void
biz22_abort(void)
{

        (void)write(FD, "\02", 1);
}

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

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

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

        (void)write(FD, s, strlen(s));
        f = signal(SIGALRM, sigALRM);
        if (setjmp(timeoutbuf)) {
                biz22_abort();
                (void)signal(SIGALRM, f);
                return (1);
        }
        (void)alarm((unsigned)number(value(DIALTIMEOUT)));
        (void)read(FD, &c, 1);
        (void)alarm(0);
        (void)signal(SIGALRM, f);
        c &= 0177;
        return (c != '\r');
}

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

        f = signal(SIGALRM, sigALRM);
        btimeout = 0;
        while (*s) {
                if (setjmp(timeoutbuf)) {
                        biz22_abort();
                        break;
                }
                (void)alarm((unsigned)number(value(DIALTIMEOUT)));
                (void)read(FD, &c, 1);
                (void)alarm(0);
                c &= 0177;
                if (c != *s++)
                        return (0);
        }
        (void)signal(SIGALRM, f);
        return (btimeout == 0);
}