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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: init_disp.c,v 1.20 2009/10/27 23:59:44 deraadt Exp $	*/
/*	$NetBSD: init_disp.c,v 1.6 1994/12/09 02:14:17 jtc 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.
 */

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

#include "talk.h"
#include <sys/ioctl.h>
#include <sys/ioctl_compat.h>
#include <err.h>
#include <stdlib.h>
#include <termios.h>
#include <unistd.h>

/*
 * Set up curses, catch the appropriate signals,
 * and build the various windows.
 */
void
init_display(void)
{
	struct sigaction sa;

	if (initscr() == NULL)
		errx(1, "Terminal type unset or lacking necessary features.");
	(void) sigaction(SIGTSTP, NULL, &sa);
	sigaddset(&sa.sa_mask, SIGALRM);
	(void) sigaction(SIGTSTP, &sa, NULL);
	curses_initialized = 1;
	clear();
	refresh();
	noecho();
	cbreak();
	signal(SIGINT, sig_sent);
	signal(SIGPIPE, sig_sent);
	signal(SIGWINCH, sig_winch);
	/* 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, smooth_scroll);
	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, smooth_scroll);
	wclear(his_win.x_win);

	line_win = newwin(1, COLS, my_win.x_nlines, 0);
#if defined(NCURSES_VERSION) || defined(whline)
	whline(line_win, '-', COLS);
#else
	box(line_win, '-', '-');
#endif
	wrefresh(line_win);
	/* let them know we are working on it */
	current_state = "No connection yet";
}

/*
 * Trade edit characters with the other talk. By agreement
 * the first three characters each talk transmits after
 * connection are the three edit characters.
 */
void
set_edit_chars(void)
{
	u_char buf[3];
	int cc;
	struct termios tty;
	
	tcgetattr(STDIN_FILENO, &tty);
	buf[0] = my_win.cerase = (tty.c_cc[VERASE] == (u_char)_POSIX_VDISABLE)
	    ? CERASE : tty.c_cc[VERASE];
	buf[1] = my_win.kill = (tty.c_cc[VKILL] == (u_char)_POSIX_VDISABLE)
	    ? CKILL : tty.c_cc[VKILL];
	buf[2] = my_win.werase = (tty.c_cc[VWERASE] == (u_char)_POSIX_VDISABLE)
	    ? CWERASE : tty.c_cc[VWERASE];
	cc = write(sockt, buf, sizeof(buf));
	if (cc != sizeof(buf) )
		quit("Lost the connection", 1);
	cc = read(sockt, buf, sizeof(buf));
	if (cc != sizeof(buf) )
		quit("Lost the connection", 1);
	his_win.cerase = buf[0];
	his_win.kill = buf[1];
	his_win.werase = buf[2];
}

void
sig_sent(int dummy)
{

	quit("Connection closing.  Exiting", 0);
}

void
sig_winch(int dummy)
{

	gotwinch = 1;
}

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

	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();
	if (warning) {
		if (do_perror)
			warn("%s", warning);
		else
			warnx("%s", warning);
	}
	exit(0);
}

/*
 * If we get SIGWINCH, recompute both window sizes and refresh things.
 */
void
resize_display(void)
{
	struct winsize ws;

	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
	    (ws.ws_row == LINES && ws.ws_col == COLS))
		return;

	/* Update curses' internal state with new window size. */
	resizeterm(ws.ws_row, ws.ws_col);

	/*
	 * Resize each window but wait to refresh the screen until
	 * everything has been drawn so the cursor is in the right spot.
	 */
	my_win.x_nlines = LINES / 2;
	my_win.x_ncols = COLS;
	wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
	mvwin(my_win.x_win, 0, 0);
	clearok(my_win.x_win, TRUE);

	his_win.x_nlines = LINES / 2 - 1;
	his_win.x_ncols = COLS;
	wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
	mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
	clearok(his_win.x_win, TRUE);

	wresize(line_win, 1, COLS);
	mvwin(line_win, my_win.x_nlines, 0);
#if defined(NCURSES_VERSION) || defined(whline)
	whline(line_win, '-', COLS);
#else
	wmove(line_win, my_win.x_nlines, 0);
	box(line_win, '-', '-');
#endif

	/* Now redraw the screen. */
	wrefresh(his_win.x_win);
	wrefresh(line_win);
	wrefresh(my_win.x_win);
}