init_disp.c revision 128445 
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#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/talk/init_disp.c 128445 2004-04-19 21:37:29Z cognet $");
37
38#ifndef lint
39static const char sccsid[] = "@(#)init_disp.c	8.2 (Berkeley) 2/16/94";
40#endif
41
42/*
43 * Initialization code for the display package,
44 * as well as the signal handling routines.
45 */
46
47#include <sys/stat.h>
48
49#include <err.h>
50#include <signal.h>
51#include <stdlib.h>
52#include <unistd.h>
53#include <termios.h>
54
55#include "talk.h"
56
57extern volatile sig_atomic_t gotwinch;
58
59/*
60 * Make sure the callee can write to the screen
61 */
62void
63check_writeable()
64{
65	char *tty;
66	struct stat sb;
67
68	if ((tty = ttyname(STDERR_FILENO)) == NULL)
69		err(1, "ttyname");
70	if (stat(tty, &sb) < 0)
71		err(1, "%s", tty);
72	if (!(sb.st_mode & S_IWGRP))
73		errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
74}
75
76/*
77 * Set up curses, catch the appropriate signals,
78 * and build the various windows.
79 */
80void
81init_display()
82{
83	struct sigaction sa;
84
85	if (initscr() == NULL)
86		errx(1, "Terminal type unset or lacking necessary features.");
87	(void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
88	sigaddset(&sa.sa_mask, SIGALRM);
89	(void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
90	curses_initialized = 1;
91	clear();
92	refresh();
93	noecho();
94	crmode();
95	signal(SIGINT, sig_sent);
96	signal(SIGPIPE, sig_sent);
97	signal(SIGWINCH, sig_winch);
98	/* curses takes care of ^Z */
99	my_win.x_nlines = LINES / 2;
100	my_win.x_ncols = COLS;
101	my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
102	idlok(my_win.x_win, TRUE);
103	scrollok(my_win.x_win, TRUE);
104	wclear(my_win.x_win);
105
106	his_win.x_nlines = LINES / 2 - 1;
107	his_win.x_ncols = COLS;
108	his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
109	    my_win.x_nlines+1, 0);
110	idlok(my_win.x_win, TRUE);
111	scrollok(his_win.x_win, TRUE);
112	wclear(his_win.x_win);
113
114	line_win = newwin(1, COLS, my_win.x_nlines, 0);
115#if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
116	whline(line_win, 0, COLS);
117#else
118	box(line_win, '-', '-');
119#endif
120	wrefresh(line_win);
121	/* let them know we are working on it */
122	current_state = "No connection yet";
123}
124
125/*
126 * Trade edit characters with the other talk. By agreement
127 * the first three characters each talk transmits after
128 * connection are the three edit characters.
129 */
130void
131set_edit_chars()
132{
133	char buf[3];
134	int cc;
135	struct termios tio;
136
137	tcgetattr(0, &tio);
138	my_win.cerase = tio.c_cc[VERASE];
139	my_win.kill = tio.c_cc[VKILL];
140	my_win.werase = tio.c_cc[VWERASE];
141	if (my_win.cerase == (char)_POSIX_VDISABLE)
142		my_win.kill = CERASE;
143	if (my_win.kill == (char)_POSIX_VDISABLE)
144		my_win.kill = CKILL;
145	if (my_win.werase == (char)_POSIX_VDISABLE)
146		my_win.werase = CWERASE;
147	buf[0] = my_win.cerase;
148	buf[1] = my_win.kill;
149	buf[2] = my_win.werase;
150	cc = write(sockt, buf, sizeof(buf));
151	if (cc != sizeof(buf) )
152		p_error("Lost the connection");
153	cc = read(sockt, buf, sizeof(buf));
154	if (cc != sizeof(buf) )
155		p_error("Lost the connection");
156	his_win.cerase = buf[0];
157	his_win.kill = buf[1];
158	his_win.werase = buf[2];
159}
160
161/* ARGSUSED */
162void
163sig_sent(signo)
164	int signo __unused;
165{
166
167	message("Connection closing. Exiting");
168	quit();
169}
170
171void
172sig_winch(int dummy)
173{
174
175	gotwinch = 1;
176}
177
178/*
179 * All done talking...hang up the phone and reset terminal thingy's
180 */
181void
182quit()
183{
184
185	if (curses_initialized) {
186		wmove(his_win.x_win, his_win.x_nlines-1, 0);
187		wclrtoeol(his_win.x_win);
188		wrefresh(his_win.x_win);
189		endwin();
190	}
191	if (invitation_waiting)
192		send_delete();
193	exit(0);
194}
195
196/*
197 * If we get SIGWINCH, recompute both window sizes and refresh things.
198 */
199void
200resize_display(void)
201{
202	struct winsize ws;
203
204	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
205	    (ws.ws_row == LINES && ws.ws_col == COLS))
206		return;
207
208	/* Update curses' internal state with new window size. */
209	resizeterm(ws.ws_row, ws.ws_col);
210
211	/*
212	 * Resize each window but wait to refresh the screen until
213	 * everything has been drawn so the cursor is in the right spot.
214	 */
215	my_win.x_nlines = LINES / 2;
216	my_win.x_ncols = COLS;
217	wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
218	mvwin(my_win.x_win, 0, 0);
219	clearok(my_win.x_win, TRUE);
220
221	his_win.x_nlines = LINES / 2 - 1;
222	his_win.x_ncols = COLS;
223	wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
224	mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
225	clearok(his_win.x_win, TRUE);
226
227	wresize(line_win, 1, COLS);
228	mvwin(line_win, my_win.x_nlines, 0);
229#if defined(NCURSES_VERSION) || defined(whline)
230	whline(line_win, '-', COLS);
231#else
232	wmove(line_win, my_win.x_nlines, 0);
233	box(line_win, '-', '-');
234#endif
235
236	/* Now redraw the screen. */
237	wrefresh(his_win.x_win);
238	wrefresh(line_win);
239	wrefresh(my_win.x_win);
240}
241