/*
 * 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.
 */

/*
 * Routines for calling up on a Ventel Modem
 * Define VENNOECHO if the Ventel is strapped for "no echo".
 */
#include "tip.h"

#define MAXRETRY        5

static int      vensync(int);
static int      gobble(char);
static void     echo(char *);
static void     sigALRM(void);
static int      timeout = 0;
static sigjmp_buf       timeoutbuf;

void    ven_disconnect(void);

/* ARGSUSED */
int
ven_dialer(char *num, char *acu)
{
        char *cp;
        int connected = 0;
        struct termios buf;
#ifdef ACULOG
        char line[80];
#endif
        /*
         * Get in synch with a couple of carriage returns
         */
        if (!vensync(FD)) {
                (void) printf("can't synchronize with ventel\n");
#ifdef ACULOG
                logent(value(HOST), num, "ventel", "can't synch up");
#endif
                return (0);
        }
        if (boolean(value(VERBOSE)))
                (void) printf("\ndialing...");
        (void) fflush(stdout);
        (void) ioctl(FD, TCGETS, &buf);
        buf.c_cflag |= HUPCL;
        (void) ioctl(FD, TCSETSF, &buf);
#ifdef VENNOECHO
        echo("#k$\r$\n$D$I$A$L$:$ ");
        for (cp = num; *cp; cp++) {
                (void) sleep(1);
                (void) write(FD, cp, 1);
        }
        echo("\r$\n");
#else
        echo("k$\r$\n$D$I$A$L$:$ <");
        for (cp = num; *cp; cp++) {
                char c;

                (void) sleep(1);
                (void) write(FD, cp, 1);
                (void) read(FD, &c, 1);
        }
        echo(">\r$\n");
#endif
        if (gobble('\n'))
                connected = gobble('!');
        (void) ioctl(FD, TCFLSH, TCIOFLUSH);
#ifdef ACULOG
        if (timeout) {
                (void) sprintf(line, "%d second dial timeout",
                    number(value(DIALTIMEOUT)));
                logent(value(HOST), num, "ventel", line);
        }
#endif
        if (timeout)
                ven_disconnect();       /* insurance */
        return (connected);
}

void
ven_disconnect(void)
{

        (void) close(FD);
}

void
ven_abort(void)
{

        (void) write(FD, "\03", 1);
        (void) close(FD);
}

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)
{

        (void) printf("\07timeout waiting for reply\n");
        timeout = 1;
        siglongjmp(timeoutbuf, 1);
}

static int
gobble(char match)
{
        char c;
        sig_handler_t f;

        f = signal(SIGALRM, (sig_handler_t)sigALRM);
        timeout = 0;
        do {
                if (sigsetjmp(timeoutbuf, 1)) {
                        (void) signal(SIGALRM, f);
                        return (0);
                }
                (void) alarm(number(value(DIALTIMEOUT)));
                (void) read(FD, &c, 1);
                (void) alarm(0);
                c &= 0177;
#ifdef notdef
                if (boolean(value(VERBOSE)))
                        (void) putchar(c);
#endif
        } while (c != '\n' && c != match);
        (void) signal(SIGALRM, SIG_DFL);
        return (c == match);
}

#define min(a, b)       (((a) > (b)) ? (b) : (a))
/*
 * This convoluted piece of code attempts to get
 * the ventel in sync.  If you don't have FIONREAD
 * there are gory ways to simulate this.
 */
static int
vensync(int fd)
{
        int already = 0, nread;
        char buf[60];
        int dtr = TIOCM_DTR;

        /*
         * Toggle DTR to force anyone off that might have left
         * the modem connected, and insure a consistent state
         * to start from.
         *
         * If you don't have the ioctl calls to diddle directly
         * with DTR, you can always try setting the baud rate to 0.
         */
        (void) ioctl(FD, TIOCMBIC, &dtr);
        (void) sleep(2);
        (void) ioctl(FD, TIOCMBIS, &dtr);
        while (already < MAXRETRY) {
                /*
                 * After reseting the modem, send it two \r's to
                 * autobaud on. Make sure to delay between them
                 * so the modem can frame the incoming characters.
                 */
                (void) write(fd, "\r", 1);
#ifdef VMUNIX
                {
#include <sys/time.h>
                struct timeval tv = {0, 500000};

                (void) select(0, 0, 0, 0, &tv);
                }
#else
                (void) sleep(1);
#endif
                (void) write(fd, "\r", 1);
                (void) sleep(3);
                if (ioctl(fd, FIONREAD, (caddr_t)&nread) < 0) {
                        perror("tip: ioctl");
                        continue;
                }
                while (nread > 0) {
                        (void) read(fd, buf, min(nread, 60));
                        if ((buf[nread - 1] & 0177) == '$')
                                return (1);
                        nread -= min(nread, 60);
                }
                (void) sleep(1);
                already++;
        }
        return (0);
}