/*
 * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved. The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#include "tip.h"

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

static int      detect(char *);
static int      bizsync(int);
static void     echo(char *);
static void     flush(char *);
static void     sigALRM(void);
static int      timeout = 0;
static sigjmp_buf       timeoutbuf;

void    biz31_disconnect(void);

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

        if (!bizsync(FD)) {
                logent(value(HOST), "", "biz", "out of sync");
                (void) printf("bizcomp out of sync\n");
                delock(uucplock);
                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(" ");
#ifdef ACULOG
        if (timeout) {
                char line[80];

                (void) sprintf(line, "%d second dial timeout",
                    number(value(DIALTIMEOUT)));
                logent(value(HOST), num, "biz", line);
        }
#endif
        if (!connected)
                flush(" NO CONNECTION\r\n\07\r\n");
        else
                flush("CONNECTION\r\n\07");
        if (timeout)
                biz31_disconnect();     /* insurance */
        return (connected);
}

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

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

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

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

void
biz31_disconnect(void)
{

        (void) write(FD, DISCONNECT_CMD, 4);
        (void) sleep(2);
        (void) ioctl(FD, TCFLSH, TCOFLUSH);
}

void
biz31_abort(void)
{

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

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

        while (c = *s++) {
                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
sigALRM(void)
{

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

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

        f = signal(SIGALRM, (sig_handler_t)sigALRM);
        timeout = 0;
        while (*s) {
                if (sigsetjmp(timeoutbuf, 1)) {
                        (void) printf("\07timeout waiting for reply\n");
                        biz31_abort();
                        break;
                }
                (void) alarm(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(char *s)
{
        char c;
        sig_handler_t f;

        f = signal(SIGALRM, (sig_handler_t)sigALRM);
        while (*s++) {
                if (sigsetjmp(timeoutbuf, 1))
                        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, (caddr_t)&b) >= 0 && chars(b) > 0)
                (void) ioctl(fd, TCFLSH, TCIOFLUSH);
        (void) write(fd, "\rp>\r", 4);
        (void) sleep(1);
        if (ioctl(fd, IOCTL, (caddr_t)&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);
}