/*
 * 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 dialing up on Vadic 831
 */
#include <sys/time.h>

#include "tip.h"

int AC;
static char     dialit(char *, char *);
static char     *sanitize(char *);
static void     alarmtr(void);

static sigjmp_buf       jmpbuf;
static int      child = -1;

int
v831_dialer(char *num, char *acu)
{
        int status, pid;
        int timelim;

        if (boolean(value(VERBOSE)))
                (void) printf("\nstarting call...");
#ifdef DEBUG
        (void) printf("(acu=%s)\n", acu);
#endif
        if ((AC = open(acu, O_RDWR)) < 0) {
                if (errno == EBUSY)
                        (void) printf("line busy...");
                else
                        (void) printf("acu open error...");
                return (0);
        }
        if (sigsetjmp(jmpbuf, 1)) {
                (void) kill(child, SIGKILL);
                (void) close(AC);
                return (0);
        }
        (void) signal(SIGALRM, (sig_handler_t)alarmtr);
        timelim = 5 * strlen(num);
        (void) alarm(timelim < 30 ? 30 : timelim);
        if ((child = fork()) == 0) {
                /*
                 * ignore this stuff for aborts
                 */
                (void) signal(SIGALRM, SIG_IGN);
                (void) signal(SIGINT, SIG_IGN);
                (void) signal(SIGQUIT, SIG_IGN);
                (void) sleep(2);
                exit(dialit(num, acu) != 'A');
        }
        /*
         * open line - will return on carrier
         */
        if ((FD = open(DV, O_RDWR)) < 0) {
#ifdef DEBUG
                (void) printf("(after open, errno=%d)\n", errno);
#endif
                if (errno == EIO)
                        (void) printf("lost carrier...");
                else
                        (void) printf("dialup line open failed...");
                (void) alarm(0);
                (void) kill(child, SIGKILL);
                (void) close(AC);
                return (0);
        }
        (void) alarm(0);
        (void) signal(SIGALRM, SIG_DFL);
        while ((pid = wait(&status)) != child && pid != -1)
                ;
        if (status) {
                (void) close(AC);
                return (0);
        }
        return (1);
}

static void
alarmtr(void)
{

        (void) alarm(0);
        siglongjmp(jmpbuf, 1);
}

/*
 * Insurance, for some reason we don't seem to be
 *  hanging up...
 */
void
v831_disconnect(void)
{
        struct termios cntrl;
        int dtr = TIOCM_DTR;

        (void) sleep(2);
#ifdef DEBUG
        printf("[disconnect: FD=%d]\n", FD);
#endif
        if (FD > 0) {
                (void) ioctl(FD, TIOCMBIC, &dtr);
                (void) ioctl(FD, TCGETS, &cntrl);
                (void) cfsetospeed(&cntrl, B0);
                cntrl.c_cflag &= ~XCLUDE;
                (void) ioctl(FD, TCSETSF, &cntrl);
        }
        (void) close(FD);
}

void
v831_abort(void)
{
        int dtr = TIOCM_DTR;
        struct termios buf;

#ifdef DEBUG
        (void) printf("[abort: AC=%d]\n", AC);
#endif
        (void) sleep(2);
        if (child > 0)
                (void) kill(child, SIGKILL);
        if (AC > 0) {
                (void) ioctl(FD, TCGETS, &buf);
                buf.c_cflag &= ~XCLUDE;
                (void) ioctl(FD, TCSETSF, &buf);
                (void) close(AC);
        }
        if (FD > 0)
                (void) ioctl(FD, TIOCMBIC, &dtr);
        (void) close(FD);
}

/*
 * Sigh, this probably must be changed at each site.
 */
struct vaconfig {
        char    *vc_name;
        char    vc_rack;
        char    vc_modem;
} vaconfig[] = {
        { "/dev/cua0", '4', '0' },
        { "/dev/cua1", '4', '1' },
        { 0 }
};

#define pc(x)   (c = x, (void) write(AC, &c, 1))
#define ABORT   01
#define SI      017
#define STX     02
#define ETX     03

static char
dialit(char *phonenum, char *acu)
{
        struct vaconfig *vp;
        struct termios cntrl;
        char c;
        int i;

        phonenum = sanitize(phonenum);
#ifdef DEBUG
        (void) printf("(dial phonenum=%s)\n", phonenum);
#endif
        if (*phonenum == '<' && phonenum[1] == 0)
                return ('Z');
        for (vp = vaconfig; vp->vc_name; vp++)
                if (strcmp(vp->vc_name, acu) == 0)
                        break;
        if (vp->vc_name == 0) {
                (void) printf("Unable to locate dialer (%s)\n", acu);
                return ('K');
        }
        (void) ioctl(AC, TCGETS, &cntrl);
        (void) cfsetospeed(&cntrl, B0);
        (void) cfsetispeed(&cntrl, B0);
        cntrl.c_cflag &= ~(CSIZE|PARENB|PARODD);
        (void) cfsetospeed(&cntrl, B2400);
        cntrl.c_cflag |= CS8;
        cntrl.c_iflag &= IXOFF|IXANY;
        cntrl.c_lflag &= ~(ICANON|ISIG);
        cntrl.c_oflag = 0;
        cntrl.c_cc[VMIN] = cntrl.c_cc[VTIME] = 0;
        (void) ioctl(AC, TCSETSF, &cntrl);
        (void) ioctl(AC, TCFLSH, TCOFLUSH);
        pc(STX);
        pc(vp->vc_rack);
        pc(vp->vc_modem);
        while (*phonenum && *phonenum != '<')
                pc(*phonenum++);
        pc(SI);
        pc(ETX);
        (void) sleep(1);
        i = read(AC, &c, 1);
#ifdef DEBUG
        printf("read %d chars, char=%c, errno %d\n", i, c, errno);
#endif
        if (i != 1)
                c = 'M';
        if (c == 'B' || c == 'G') {
                char cc, oc = c;

                pc(ABORT);
                (void) read(AC, &cc, 1);
#ifdef DEBUG
                (void) printf("abort response=%c\n", cc);
#endif
                c = oc;
                v831_disconnect();
        }
        (void) close(AC);
#ifdef DEBUG
        (void) printf("dialit: returns %c\n", c);
#endif
        return (c);
}

static char *
sanitize(char *s)
{
        static char buf[128];
        char *cp;

        for (cp = buf; *s; s++) {
                if (!isdigit(*s) && *s == '<' && *s != '_')
                        continue;
                if (*s == '_')
                        *s = '=';
                *cp++ = *s;
        }
        *cp++ = 0;
        return (buf);
}