/*      $NetBSD: io.c,v 1.14 2011/09/06 18:32:03 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>
#ifndef lint
#if 0
static char sccsid[] = "@(#)io.c        8.1 (Berkeley) 6/6/93";
#endif
__RCSID("$NetBSD: io.c,v 1.14 2011/09/06 18:32:03 joerg Exp $");
#endif /* not lint */

/*
 * This file contains the I/O handling and the exchange of 
 * edit characters. This connection itself is established in
 * ctl.c
 */

#include "talk.h"
#include <sys/ioctl.h>
#include <sys/time.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <poll.h>

#define A_LONG_TIME 1000000

/*
 * The routine to do the actual talking
 */
void
talk(void)
{
        struct pollfd set[2];
        int nb;
        char buf[BUFSIZ];

        message("Connection established\007\007\007");
        current_line = 0;

        /*
         * Wait on both the other process (sockt_mask) and 
         * standard input ( STDIN_MASK )
         */
        set[0].fd = sockt;
        set[0].events = POLLIN;
        set[1].fd = fileno(stdin);
        set[1].events = POLLIN;
        for (;;) {
                nb = poll(set, 2, A_LONG_TIME * 1000);
                if (nb <= 0) {
                        if (errno == EINTR)
                                continue;
                        /* panic, we don't know what happened */
                        p_error("Unexpected error from poll");
                        quit();
                }
                if (set[0].revents & POLLIN) { 
                        /* There is data on sockt */
                        nb = read(sockt, buf, sizeof buf);
                        if (nb <= 0) {
                                message("Connection closed. Exiting");
                                quit();
                        }
                        display(&his_win, buf, nb);
                }
                if (set[1].revents & POLLIN) {
                        /*
                         * We can't make the tty non_blocking, because
                         * curses's output routines would screw up
                         */
                        ioctl(0, FIONREAD, (void *) &nb);
                        nb = read(0, buf, nb);
                        display(&my_win, buf, nb);
                        /* might lose data here because sockt is non-blocking */
                        if (nb > 0)
                                write(sockt, buf, nb);
                }
        }
}

/*
 * p_error prints the system error message on the standard location
 * on the screen and then exits. (i.e. a curses version of perror)
 */
void
p_error(const char *string)
{
        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
        wprintw(my_win.x_win, "[%s : %s (%d)]\n",
            string, strerror(errno), errno);
        wrefresh(my_win.x_win);
        move(LINES-1, 0);
        refresh();
        quit();
}

/*
 * Display string in the standard location
 */
void
message(const char *string)
{
        wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
        wprintw(my_win.x_win, "[%s]", string);
        wclrtoeol(my_win.x_win);
        current_line++;
        wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
        wrefresh(my_win.x_win);
}