inetutils/talk/init_disp.c

/*
  Copyright (C) 1995-2025 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.
 */

#include <config.h>

#include <stdlib.h>

/*
 * Initialization code for the display package,
 * as well as the signal handling routines.
 */

#include <termios.h>
#include <unistd.h>
#include <signal.h>
#include <error.h>
#include "talk.h"
#include "attribute.h"

static void
sig_sent (int sig MAYBE_UNUSED)
{

  message ("Connection closing. Exiting");
  quit ();
}

/*
 * Set up curses, catch the appropriate signals,
 * and build the various windows.
 */
int
init_display (void)
{
#ifdef HAVE_SIGACTION
  struct sigaction siga;
#else
# ifdef HAVE_SIGVEC
  struct sigvec sigv;
# endif
#endif

  if (initscr () == NULL)
    error (EXIT_FAILURE, 0,
	   "Terminal type unset or lacking necessary features.");

#ifdef HAVE_SIGACTION
  sigaction (SIGTSTP, (struct sigaction *) 0, &siga);
  sigaddset (&siga.sa_mask, SIGALRM);
  sigaction (SIGTSTP, &siga, (struct sigaction *) 0);
#else /* !HAVE_SIGACTION */
# ifdef HAVE_SIGVEC
  sigvec (SIGTSTP, (struct sigvec *) 0, &sigv);
  sigv.sv_mask |= sigmask (SIGALRM);
  sigvec (SIGTSTP, &sigv, (struct sigvec *) 0);
# endif/* HAVE_SIGVEC */
#endif /* HAVE_SIGACTION */

  curses_initialized = 1;
  clear ();
  refresh ();
  noecho ();
  crmode ();

  signal (SIGQUIT, sig_sent);
  signal (SIGINT, sig_sent);
  signal (SIGPIPE, sig_sent);

  /* curses takes care of ^Z */
  my_win.x_nlines = LINES / 2;
  my_win.x_ncols = COLS;
  my_win.x_win = newwin (my_win.x_nlines, my_win.x_ncols, 0, 0);
  scrollok (my_win.x_win, FALSE);
  wclear (my_win.x_win);

  his_win.x_nlines = LINES / 2 - 1;
  his_win.x_ncols = COLS;
  his_win.x_win = newwin (his_win.x_nlines, his_win.x_ncols,
			  my_win.x_nlines + 1, 0);
  scrollok (his_win.x_win, FALSE);
  wclear (his_win.x_win);

  line_win = newwin (1, COLS, my_win.x_nlines, 0);
  box (line_win, '-', '-');
  wrefresh (line_win);

  return 0;
}

/*
 * Trade edit characters with the other talk. By agreement
 * the first three characters each talk transmits after
 * connection are the three edit characters.
 */
int
set_edit_chars (void)
{
  int cc;
  char buf[3];

#ifdef HAVE_TCGETATTR
  struct termios tty;
  cc_t disable = (cc_t) - 1, erase, werase, kill;

# if !defined _POSIX_VDISABLE && defined HAVE_FPATHCONF && defined _PC_VDISABLE
  disable = fpathconf (0, _PC_VDISABLE);
# endif

  erase = werase = kill = disable;

  if (tcgetattr (0, &tty) >= 0)
    {
      erase = tty.c_cc[VERASE];
# ifdef VWERASE
      werase = tty.c_cc[VWERASE];
# endif
      kill = tty.c_cc[VKILL];
    }

  if (erase == disable)
    erase = '\177';		/* rubout */
  if (werase == disable)
    werase = '\027';		/* ^W */
  if (kill == disable)
    kill = '\025';		/* ^U */

  my_win.cerase = erase;
  my_win.werase = werase;
  my_win.kill = kill;
#else /* !HAVE_TCGETATTR */
  struct sgttyb tty;
  struct ltchars ltc;

  ioctl (0, TIOCGETP, &tty);
  ioctl (0, TIOCGLTC, (struct sgttyb *) &ltc);
  my_win.cerase = tty.sg_erase;
  my_win.kill = tty.sg_kill;
  if (ltc.t_werasc == (char) -1)
    my_win.werase = '\027';	/* control W */
  else
    my_win.werase = ltc.t_werasc;
#endif /* HAVE_TCGETATTR */

  buf[0] = my_win.cerase;
  buf[1] = my_win.kill;
  buf[2] = my_win.werase;
  cc = write (sockt, buf, sizeof (buf));
  if (cc != sizeof (buf))
    p_error ("Lost the connection");
  cc = read (sockt, buf, sizeof (buf));
  if (cc != sizeof (buf))
    p_error ("Lost the connection");
  his_win.cerase = buf[0];
  his_win.kill = buf[1];
  his_win.werase = buf[2];

  return 0;
}

/*
 * All done talking...hang up the phone and reset terminal thingy's
 */
int
quit (void)
{

  if (curses_initialized)
    {
      wmove (his_win.x_win, his_win.x_nlines - 1, 0);
      wclrtoeol (his_win.x_win);
      wrefresh (his_win.x_win);
      endwin ();
    }
  if (invitation_waiting)
    send_delete ();
  exit (EXIT_SUCCESS);
}