init_disp.c revision 50636 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)init_disp.c	8.2 (Berkeley) 2/16/94";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/usr.bin/talk/init_disp.c 50636 1999-08-30 08:21:17Z peter $";
40#endif /* not lint */
41
42/*
43 * Initialization code for the display package,
44 * as well as the signal handling routines.
45 */
46
47#include <err.h>
48#include <signal.h>
49#include <sys/stat.h>
50#include <unistd.h>
51#include <termios.h>
52#include "talk.h"
53
54/*
55 * Make sure the callee can write to the screen
56 */
57void
58check_writeable()
59{
60	char *tty;
61	struct stat sb;
62
63	if ((tty = ttyname(STDERR_FILENO)) == NULL)
64		err(1, "ttyname");
65	if (stat(tty, &sb) < 0)
66		err(1, "%s", tty);
67	if (!(sb.st_mode & S_IWGRP))
68		errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
69}
70
71/*
72 * Set up curses, catch the appropriate signals,
73 * and build the various windows.
74 */
75void
76init_display()
77{
78	struct sigaction sa;
79
80	if (initscr() == NULL)
81		errx(1, "Terminal type unset or lacking necessary features.");
82	(void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
83	sigaddset(&sa.sa_mask, SIGALRM);
84	(void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
85	curses_initialized = 1;
86	clear();
87	refresh();
88	noecho();
89	crmode();
90	signal(SIGINT, sig_sent);
91	signal(SIGPIPE, sig_sent);
92	/* curses takes care of ^Z */
93	my_win.x_nlines = LINES / 2;
94	my_win.x_ncols = COLS;
95	my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
96	idlok(my_win.x_win, TRUE);
97	scrollok(my_win.x_win, TRUE);
98	wclear(my_win.x_win);
99
100	his_win.x_nlines = LINES / 2 - 1;
101	his_win.x_ncols = COLS;
102	his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
103	    my_win.x_nlines+1, 0);
104	idlok(my_win.x_win, TRUE);
105	scrollok(his_win.x_win, TRUE);
106	wclear(his_win.x_win);
107
108	line_win = newwin(1, COLS, my_win.x_nlines, 0);
109#if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
110	whline(line_win, 0, COLS);
111#else
112	box(line_win, '-', '-');
113#endif
114	wrefresh(line_win);
115	/* let them know we are working on it */
116	current_state = "No connection yet";
117}
118
119/*
120 * Trade edit characters with the other talk. By agreement
121 * the first three characters each talk transmits after
122 * connection are the three edit characters.
123 */
124void
125set_edit_chars()
126{
127	char buf[3];
128	int cc;
129	struct termios tio;
130
131	tcgetattr(0, &tio);
132	my_win.cerase = tio.c_cc[VERASE];
133	my_win.kill = tio.c_cc[VKILL];
134	my_win.werase = tio.c_cc[VWERASE];
135	if (my_win.cerase == (char)_POSIX_VDISABLE)
136		my_win.kill = CERASE;
137	if (my_win.kill == (char)_POSIX_VDISABLE)
138		my_win.kill = CKILL;
139	if (my_win.werase == (char)_POSIX_VDISABLE)
140		my_win.werase = CWERASE;
141	buf[0] = my_win.cerase;
142	buf[1] = my_win.kill;
143	buf[2] = my_win.werase;
144	cc = write(sockt, buf, sizeof(buf));
145	if (cc != sizeof(buf) )
146		p_error("Lost the connection");
147	cc = read(sockt, buf, sizeof(buf));
148	if (cc != sizeof(buf) )
149		p_error("Lost the connection");
150	his_win.cerase = buf[0];
151	his_win.kill = buf[1];
152	his_win.werase = buf[2];
153}
154
155/* ARGSUSED */
156void
157sig_sent(signo)
158	int signo;
159{
160
161	message("Connection closing. Exiting");
162	quit();
163}
164
165/*
166 * All done talking...hang up the phone and reset terminal thingy's
167 */
168void
169quit()
170{
171
172	if (curses_initialized) {
173		wmove(his_win.x_win, his_win.x_nlines-1, 0);
174		wclrtoeol(his_win.x_win);
175		wrefresh(his_win.x_win);
176		endwin();
177	}
178	if (invitation_waiting)
179		send_delete();
180	exit(0);
181}
182