/*      $NetBSD: tipout.c,v 1.15 2011/09/06 18:33:01 joerg 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>
#include <poll.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)tipout.c    8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: tipout.c,v 1.15 2011/09/06 18:33:01 joerg Exp $");
#endif /* not lint */

#include "tip.h"
/*
 * tip
 *
 * lower fork of tip -- handles passive side
 *  reading from the remote host
 */

void    intEMT(void);
void    intIOT(void);
void    intSYS(void);
__dead static void      intTERM(int);

/*
 * TIPOUT wait state routine --
 *   sent by TIPIN when it wants to posses the remote host
 */
void
intIOT(void)
{

        (void)write(repdes[1],&ccc,1);  /* We got the message */
        (void)read(fildes[0], &ccc,1);  /* Now wait for coprocess */
}

/*
 * Scripting command interpreter --
 *  accepts script file name over the pipe and acts accordingly
 */
void
intEMT(void)
{
        char c, line[256];
        char *pline = line;
        char reply;

        (void)read(fildes[0], &c, 1);           /* We got the message */
        while (c != '\n' && line + sizeof line - pline > 0) {
                *pline++ = c;
                (void)read(fildes[0], &c, 1);
        }
        *pline = '\0';
        if (boolean(value(SCRIPT)) && fscript != NULL)
                (void)fclose(fscript);
        if (pline == line) {
                setboolean(value(SCRIPT), FALSE);
                reply = 'y';
        } else {
                if ((fscript = fopen(line, "a")) == NULL)
                        reply = 'n';
                else {
                        reply = 'y';
                        setboolean(value(SCRIPT), TRUE);
                }
        }
        (void)write(repdes[1], &reply, 1);      /* Now coprocess waits for us */
}

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

        if (boolean(value(SCRIPT)) && fscript != NULL)
                (void)fclose(fscript);
        exit(0);
}

void
intSYS(void)
{

        setboolean(value(BEAUTIFY), !boolean(value(BEAUTIFY)));
}

/*
 * ****TIPOUT   TIPOUT****
 */
void
tipout(void)
{
        char buf[BUFSIZ];
        char *cp;
        int cnt;
        int omask;
        struct pollfd pfd[2];

        (void)signal(SIGINT, SIG_IGN);
        (void)signal(SIGQUIT, SIG_IGN);
        (void)signal(SIGHUP, intTERM);  /* for dial-ups */
        (void)signal(SIGTERM, intTERM); /* time to go signal*/

        pfd[0].fd = attndes[0];
        pfd[0].events = POLLIN;
        pfd[1].fd = FD;
        pfd[1].events = POLLIN|POLLHUP;

        for (omask = 0;; (void)sigsetmask(omask)) {

        if (poll(pfd, 2, -1) > 0) {

        if (pfd[0].revents & POLLIN)
                if (read(attndes[0], &ccc, 1) > 0) {
                        switch(ccc) {
                        case 'W':
                                intIOT();       /* TIPIN wants us to wait */
                                break;
                        case 'S':
                                intEMT();       /* TIPIN wants us to script */
                                break;
                        case 'B':
                                intSYS();       /* "Beautify" value toggle */
                                break;
                        default:
                                break;
                        }
                }
        }

        if (pfd[1].revents & (POLLIN|POLLHUP)) {
                        cnt = read(FD, buf, BUFSIZ);
                        if (cnt <= 0) {
                                /* lost carrier || EOF */
                                if ((cnt < 0 && errno == EIO) || (cnt == 0)) {
                                        (void)sigblock(sigmask(SIGTERM));
                                        intTERM(0);
                                        /*NOTREACHED*/
                                }
                                continue;
                        }
                        omask = sigblock(SIGTERM);
                        for (cp = buf; cp < buf + cnt; cp++)
                                *cp &= STRIP_PAR;
                        (void)write(1, buf, (size_t)cnt);
                        if (boolean(value(SCRIPT)) && fscript != NULL) {
                                if (!boolean(value(BEAUTIFY))) {
                                        (void)fwrite(buf, 1, (size_t)cnt, fscript);
                                        continue;
                                }
                                for (cp = buf; cp < buf + cnt; cp++)
                                        if ((*cp >= ' ' && *cp <= '~') ||
                                            any(*cp, value(EXCEPTIONS)))
                                                (void)putc(*cp, fscript);
                        }
                }
        }
}