inetutils/talk/io.c

/*
  Copyright (C) 1995-2023 Free Software Foundation, Inc.

  This file is part of GNU Inetutils.

  GNU Inetutils is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or (at
  your option) any later version.

  GNU Inetutils is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see `http://www.gnu.org/licenses/'. */

/*
 * 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.
 */

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

#include <config.h>

#include <sys/types.h>
#include <sys/ioctl.h>
#ifdef HAVE_SYS_FILIO_H
# include <sys/filio.h>
#endif
#include <sys/time.h>
#include <time.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/select.h>
#include "talk.h"

#define A_LONG_TIME 10000000

/*
 * The routine to do the actual talking
 */
int
talk (void)
{
  fd_set read_template, read_set;
  int stdin_fd = fileno (stdin);
  int i, nb, num_fds;
  char buf[BUFSIZ];
  struct timeval wait;

  message ("Connection established");
  beep ();
  current_line = 0;

  /*
   * Wait on both the other process (SOCKET) and stdin.
   */
  FD_ZERO (&read_template);
  FD_SET (sockt, &read_template);
  FD_SET (stdin_fd, &read_template);
  num_fds = (stdin_fd > sockt ? stdin_fd : sockt) + 1;

  for (;;)
    {
      read_set = read_template;
      wait.tv_sec = A_LONG_TIME;
      wait.tv_usec = 0;
      nb = select (num_fds, &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 (stdin_fd, &read_set))
	{
	  /*
	   * We can't make the tty non_blocking, because
	   * curses's output routines would screw up
	   */
	  ioctl (0, FIONREAD, (struct sgttyb *) &nb);
	  for (i = 0; i < nb; i++)
	    buf[i] = getch ();
	  display (&my_win, buf, nb);
	  /* might lose data here because sockt is non-blocking */
	  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.
 */
int
p_error (char *string)
{
  if (curses_initialized)
    {
      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 ();
    }
  else
    perror (string);

  quit ();

  return 0;
}

/*
 * Display string in the standard location.
 */
int
message (char *string)
{
  if (curses_initialized)
    {
      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);
    }
  else if (string && string[0])
    printf ("[%s]\n", string);

  return 0;
}