1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33
34 __FBSDID("$FreeBSD$");
35
36 #ifndef lint
37 static const char sccsid[] = "@(#)init_disp.c 8.2 (Berkeley) 2/16/94";
38 #endif
39
40 /*
41 * Initialization code for the display package,
42 * as well as the signal handling routines.
43 */
44
45 #include <sys/stat.h>
46
47 #include <err.h>
48 #include <signal.h>
49 #include <stdlib.h>
50 #include <unistd.h>
51 #include <termios.h>
52
53 #include "talk.h"
54
55 /*
56 * Make sure the callee can write to the screen
57 */
58 void
check_writeable(void)59 check_writeable(void)
60 {
61 char *tty;
62 struct stat sb;
63
64 if ((tty = ttyname(STDERR_FILENO)) == NULL)
65 err(1, "ttyname");
66 if (stat(tty, &sb) < 0)
67 err(1, "%s", tty);
68 if (!(sb.st_mode & S_IWGRP))
69 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
70 }
71
72 /*
73 * Set up curses, catch the appropriate signals,
74 * and build the various windows.
75 */
76 void
init_display(void)77 init_display(void)
78 {
79 struct sigaction sa;
80
81 if (initscr() == NULL)
82 errx(1, "Terminal type unset or lacking necessary features.");
83 (void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
84 sigaddset(&sa.sa_mask, SIGALRM);
85 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
86 curses_initialized = 1;
87 clear();
88 refresh();
89 noecho();
90 crmode();
91 signal(SIGINT, sig_sent);
92 signal(SIGPIPE, sig_sent);
93 signal(SIGWINCH, sig_winch);
94 /* curses takes care of ^Z */
95 my_win.x_nlines = LINES / 2;
96 my_win.x_ncols = COLS;
97 my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
98 idlok(my_win.x_win, TRUE);
99 scrollok(my_win.x_win, TRUE);
100 wclear(my_win.x_win);
101
102 his_win.x_nlines = LINES / 2 - 1;
103 his_win.x_ncols = COLS;
104 his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
105 my_win.x_nlines+1, 0);
106 idlok(my_win.x_win, TRUE);
107 scrollok(his_win.x_win, TRUE);
108 wclear(his_win.x_win);
109
110 line_win = newwin(1, COLS, my_win.x_nlines, 0);
111 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
112 whline(line_win, 0, COLS);
113 #else
114 box(line_win, '-', '-');
115 #endif
116 wrefresh(line_win);
117 /* let them know we are working on it */
118 current_state = "No connection yet";
119 }
120
121 /*
122 * Trade edit characters with the other talk. By agreement
123 * the first three characters each talk transmits after
124 * connection are the three edit characters.
125 */
126 void
set_edit_chars(void)127 set_edit_chars(void)
128 {
129 char buf[3];
130 int cc;
131 struct termios tio;
132
133 tcgetattr(0, &tio);
134 my_win.cerase = tio.c_cc[VERASE];
135 my_win.kill = tio.c_cc[VKILL];
136 my_win.werase = tio.c_cc[VWERASE];
137 if (my_win.cerase == (char)_POSIX_VDISABLE)
138 my_win.kill = CERASE;
139 if (my_win.kill == (char)_POSIX_VDISABLE)
140 my_win.kill = CKILL;
141 if (my_win.werase == (char)_POSIX_VDISABLE)
142 my_win.werase = CWERASE;
143 buf[0] = my_win.cerase;
144 buf[1] = my_win.kill;
145 buf[2] = my_win.werase;
146 cc = write(sockt, buf, sizeof(buf));
147 if (cc != sizeof(buf) )
148 p_error("Lost the connection");
149 cc = read(sockt, buf, sizeof(buf));
150 if (cc != sizeof(buf) )
151 p_error("Lost the connection");
152 his_win.cerase = buf[0];
153 his_win.kill = buf[1];
154 his_win.werase = buf[2];
155 }
156
157 /* ARGSUSED */
158 void
sig_sent(int signo __unused)159 sig_sent(int signo __unused)
160 {
161
162 message("Connection closing. Exiting");
163 quit();
164 }
165
166 void
sig_winch(int dummy __unused)167 sig_winch(int dummy __unused)
168 {
169
170 gotwinch = 1;
171 }
172
173 /*
174 * All done talking...hang up the phone and reset terminal thingy's
175 */
176 void
quit(void)177 quit(void)
178 {
179
180 if (curses_initialized) {
181 wmove(his_win.x_win, his_win.x_nlines-1, 0);
182 wclrtoeol(his_win.x_win);
183 wrefresh(his_win.x_win);
184 endwin();
185 }
186 if (invitation_waiting)
187 send_delete();
188 exit(0);
189 }
190
191 /*
192 * If we get SIGWINCH, recompute both window sizes and refresh things.
193 */
194 void
resize_display(void)195 resize_display(void)
196 {
197 struct winsize ws;
198
199 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
200 (ws.ws_row == LINES && ws.ws_col == COLS))
201 return;
202
203 /* Update curses' internal state with new window size. */
204 resizeterm(ws.ws_row, ws.ws_col);
205
206 /*
207 * Resize each window but wait to refresh the screen until
208 * everything has been drawn so the cursor is in the right spot.
209 */
210 my_win.x_nlines = LINES / 2;
211 my_win.x_ncols = COLS;
212 wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
213 mvwin(my_win.x_win, 0, 0);
214 clearok(my_win.x_win, TRUE);
215
216 his_win.x_nlines = LINES / 2 - 1;
217 his_win.x_ncols = COLS;
218 wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
219 mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
220 clearok(his_win.x_win, TRUE);
221
222 wresize(line_win, 1, COLS);
223 mvwin(line_win, my_win.x_nlines, 0);
224 #if defined(NCURSES_VERSION) || defined(whline)
225 whline(line_win, '-', COLS);
226 #else
227 wmove(line_win, my_win.x_nlines, 0);
228 box(line_win, '-', '-');
229 #endif
230
231 /* Now redraw the screen. */
232 wrefresh(his_win.x_win);
233 wrefresh(line_win);
234 wrefresh(my_win.x_win);
235 }
236