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 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD$");
33
34#ifndef lint
35static const char sccsid[] = "@(#)init_disp.c	8.2 (Berkeley) 2/16/94";
36#endif
37
38/*
39 * Initialization code for the display package,
40 * as well as the signal handling routines.
41 */
42
43#include <sys/stat.h>
44
45#include <err.h>
46#include <signal.h>
47#include <stdlib.h>
48#include <unistd.h>
49#include <termios.h>
50
51#include "talk.h"
52
53/*
54 * Make sure the callee can write to the screen
55 */
56void
57check_writeable(void)
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(void)
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	signal(SIGWINCH, sig_winch);
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(void)
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(int signo __unused)
158{
159
160	message("Connection closing. Exiting");
161	quit();
162}
163
164void
165sig_winch(int dummy __unused)
166{
167
168	gotwinch = 1;
169}
170
171/*
172 * All done talking...hang up the phone and reset terminal thingy's
173 */
174void
175quit(void)
176{
177
178	if (curses_initialized) {
179		wmove(his_win.x_win, his_win.x_nlines-1, 0);
180		wclrtoeol(his_win.x_win);
181		wrefresh(his_win.x_win);
182		endwin();
183	}
184	if (invitation_waiting)
185		send_delete();
186	exit(0);
187}
188
189/*
190 * If we get SIGWINCH, recompute both window sizes and refresh things.
191 */
192void
193resize_display(void)
194{
195	struct winsize ws;
196
197	if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
198	    (ws.ws_row == LINES && ws.ws_col == COLS))
199		return;
200
201	/* Update curses' internal state with new window size. */
202	resizeterm(ws.ws_row, ws.ws_col);
203
204	/*
205	 * Resize each window but wait to refresh the screen until
206	 * everything has been drawn so the cursor is in the right spot.
207	 */
208	my_win.x_nlines = LINES / 2;
209	my_win.x_ncols = COLS;
210	wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
211	mvwin(my_win.x_win, 0, 0);
212	clearok(my_win.x_win, TRUE);
213
214	his_win.x_nlines = LINES / 2 - 1;
215	his_win.x_ncols = COLS;
216	wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
217	mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
218	clearok(his_win.x_win, TRUE);
219
220	wresize(line_win, 1, COLS);
221	mvwin(line_win, my_win.x_nlines, 0);
222#if defined(NCURSES_VERSION) || defined(whline)
223	whline(line_win, '-', COLS);
224#else
225	wmove(line_win, my_win.x_nlines, 0);
226	box(line_win, '-', '-');
227#endif
228
229	/* Now redraw the screen. */
230	wrefresh(his_win.x_win);
231	wrefresh(line_win);
232	wrefresh(my_win.x_win);
233}
234