/*      $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);
}