/*
 * 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.
 *
 * @(#)io.c     8.1 (Berkeley) 6/6/93
 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $
 */

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

#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <sys/filio.h>
#include "talk.h"
#include "talk_ctl.h"

#define A_LONG_TIME 10000000

/*
 * The routine to do the actual talking
 */
void
talk(void)
{
        struct hostent *hp, *hp2;
        int nb;
        fd_set read_set, read_template;
        char buf[BUFSIZ], **addr, *his_machine_name;
        struct timeval wait;

        his_machine_name = NULL;
        hp = gethostbyaddr(&his_machine_addr.s_addr,
            sizeof(his_machine_addr.s_addr), AF_INET);
        if (hp != NULL) {
                hp2 = gethostbyname(hp->h_name);
                if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
                    hp2->h_length == sizeof(his_machine_addr))
                        for (addr = hp2->h_addr_list; *addr != NULL; addr++)
                                if (memcmp(*addr, &his_machine_addr,
                                    sizeof(his_machine_addr)) == 0) {
                                        his_machine_name = strdup(hp->h_name);
                                        break;
                                }
        }
        if (his_machine_name == NULL)
                his_machine_name = strdup(inet_ntoa(his_machine_addr));
        snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
            msg.r_name, his_machine_name);
        free(his_machine_name);
        message(buf);
        write(STDOUT_FILENO, "\007\007\007", 3);
        
        current_line = 0;

        /*
         * Wait on both the other process (sockt_mask) and
         * standard input ( STDIN_MASK )
         */
        FD_ZERO(&read_template);
        FD_SET(sockt, &read_template);
        FD_SET(fileno(stdin), &read_template);
        for (;;) {
                read_set = read_template;
                wait.tv_sec = A_LONG_TIME;
                wait.tv_usec = 0;
                nb = select(32, &read_set, 0, 0, &wait);
                if (nb <= 0) {
                        if (errno == EINTR) {
                                read_set = read_template;
                                continue;
                        }
                        /* panic, we don't know what happened */
                        p_error("Unexpected error from select");
                        quit();
                }
                if (FD_ISSET(sockt, &read_set)) {
                        /* 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 (FD_ISSET(fileno(stdin), &read_set)) {
                        /*
                         * We can't make the tty non_blocking, because
                         * curses's output routines would screw up
                         */
                        int i;
                        ioctl(0, FIONREAD, (struct sgttyb *) &nb);
                        nb = read(0, buf, nb);
                        display(&my_win, buf, nb);
                        /* might lose data here because sockt is non-blocking */
                        for (i = 0; i < nb; ++i)
                                if (buf[i] == '\r')
                                        buf[i] = '\n';
                        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, 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, 0);
        wprintw(my_win.x_win, "[%s]\n", string);
        if (current_line < my_win.x_nlines - 1)
                current_line++;
        wrefresh(my_win.x_win);
}