init_disp.c revision 20988 
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
35static char sccsid[] = "@(#)init_disp.c	8.2 (Berkeley) 2/16/94";
36#endif /* not lint */
37
38/*
39 * Initialization code for the display package,
40 * as well as the signal handling routines.
41 */
42
43#include <sys/types.h>
44#include <sys/stat.h>
45#include <sys/termios.h>
46#include <sys/ttydefaults.h>
47
48#include <unistd.h>
49#include <signal.h>
50#include <err.h>
51#include "talk.h"
52
53/*
54 * Make sure the callee can write to the screen
55 */
56void
57check_writeable()
58{
59	char *tty;
60	struct stat sb;
61
62	if ((tty = ttyname(STDERR_FILENO)) == NULL)
63		err(1, "ttyname");
64	if (stat(tty, &sb) < 0)
65		err(1, "%s", tty);
66	if (!(sb.st_mode & S_IWGRP))
67		errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
68}
69
70/*
71 * Set up curses, catch the appropriate signals,
72 * and build the various windows.
73 */
74void
75init_display()
76{
77	struct sigaction sa;
78
79	if (initscr() == NULL)
80		errx(1, "Terminal type unset or lacking necessary features.");
81	(void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
82	sigaddset(&sa.sa_mask, SIGALRM);
83	(void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
84	curses_initialized = 1;
85	clear();
86	refresh();
87	noecho();
88	crmode();
89	signal(SIGINT, sig_sent);
90	signal(SIGPIPE, sig_sent);
91	/* curses takes care of ^Z */
92	my_win.x_nlines = LINES / 2;
93	my_win.x_ncols = COLS;
94	my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
95	idlok(my_win.x_win, TRUE);
96	scrollok(my_win.x_win, TRUE);
97	wclear(my_win.x_win);
98
99	his_win.x_nlines = LINES / 2 - 1;
100	his_win.x_ncols = COLS;
101	his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
102	    my_win.x_nlines+1, 0);
103	idlok(my_win.x_win, TRUE);
104	scrollok(his_win.x_win, TRUE);
105	wclear(his_win.x_win);
106
107	line_win = newwin(1, COLS, my_win.x_nlines, 0);
108#if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
109	whline(line_win, 0, COLS);
110#else
111	box(line_win, '-', '-');
112#endif
113	wrefresh(line_win);
114	/* let them know we are working on it */
115	current_state = "No connection yet";
116}
117
118/*
119 * Trade edit characters with the other talk. By agreement
120 * the first three characters each talk transmits after
121 * connection are the three edit characters.
122 */
123void
124set_edit_chars()
125{
126	char buf[3];
127	int cc;
128	struct termios tio;
129
130	tcgetattr(0, &tio);
131	my_win.cerase = tio.c_cc[VERASE];
132	my_win.kill = tio.c_cc[VKILL];
133	my_win.werase = tio.c_cc[VWERASE];
134	if (my_win.cerase == (char)_POSIX_VDISABLE)
135		my_win.kill = CERASE;
136	if (my_win.kill == (char)_POSIX_VDISABLE)
137		my_win.kill = CKILL;
138	if (my_win.werase == (char)_POSIX_VDISABLE)
139		my_win.werase = CWERASE;
140	buf[0] = my_win.cerase;
141	buf[1] = my_win.kill;
142	buf[2] = my_win.werase;
143	cc = write(sockt, buf, sizeof(buf));
144	if (cc != sizeof(buf) )
145		p_error("Lost the connection");
146	cc = read(sockt, buf, sizeof(buf));
147	if (cc != sizeof(buf) )
148		p_error("Lost the connection");
149	his_win.cerase = buf[0];
150	his_win.kill = buf[1];
151	his_win.werase = buf[2];
152}
153
154/* ARGSUSED */
155void
156sig_sent(signo)
157	int signo;
158{
159
160	message("Connection closing. Exiting");
161	quit();
162}
163
164/*
165 * All done talking...hang up the phone and reset terminal thingy's
166 */
167void
168quit()
169{
170
171	if (curses_initialized) {
172		wmove(his_win.x_win, his_win.x_nlines-1, 0);
173		wclrtoeol(his_win.x_win);
174		wrefresh(his_win.x_win);
175		endwin();
176	}
177	if (invitation_waiting)
178		send_delete();
179	exit(0);
180}
181