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
33 #ifndef lint
34 static const char sccsid[] = "@(#)init_disp.c 8.2 (Berkeley) 2/16/94";
35 #endif
36
37 /*
38 * Initialization code for the display package,
39 * as well as the signal handling routines.
40 */
41
42 #include <sys/stat.h>
43
44 #include <err.h>
45 #include <signal.h>
46 #include <stdlib.h>
47 #include <unistd.h>
48 #include <termios.h>
49
50 #include "talk.h"
51
52 /*
53 * Make sure the callee can write to the screen
54 */
55 void
check_writeable(void)56 check_writeable(void)
57 {
58 char *tty;
59 struct stat sb;
60
61 if ((tty = ttyname(STDERR_FILENO)) == NULL)
62 err(1, "ttyname");
63 if (stat(tty, &sb) < 0)
64 err(1, "%s", tty);
65 if (!(sb.st_mode & S_IWGRP))
66 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
67 }
68
69 /*
70 * Set up curses, catch the appropriate signals,
71 * and build the various windows.
72 */
73 void
init_display(void)74 init_display(void)
75 {
76 struct sigaction sa;
77
78 if (initscr() == NULL)
79 errx(1, "Terminal type unset or lacking necessary features.");
80 (void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
81 sigaddset(&sa.sa_mask, SIGALRM);
82 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
83 curses_initialized = 1;
84 clear();
85 refresh();
86 noecho();
87 crmode();
88 signal(SIGINT, sig_sent);
89 signal(SIGPIPE, sig_sent);
90 signal(SIGWINCH, sig_winch);
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 */
123 void
set_edit_chars(void)124 set_edit_chars(void)
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 */
155 void
sig_sent(int signo __unused)156 sig_sent(int signo __unused)
157 {
158
159 message("Connection closing. Exiting");
160 quit();
161 }
162
163 void
sig_winch(int dummy __unused)164 sig_winch(int dummy __unused)
165 {
166
167 gotwinch = 1;
168 }
169
170 /*
171 * All done talking...hang up the phone and reset terminal thingy's
172 */
173 void
quit(void)174 quit(void)
175 {
176
177 if (curses_initialized) {
178 wmove(his_win.x_win, his_win.x_nlines-1, 0);
179 wclrtoeol(his_win.x_win);
180 wrefresh(his_win.x_win);
181 endwin();
182 }
183 if (invitation_waiting)
184 send_delete();
185 exit(0);
186 }
187
188 /*
189 * If we get SIGWINCH, recompute both window sizes and refresh things.
190 */
191 void
resize_display(void)192 resize_display(void)
193 {
194 struct winsize ws;
195
196 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
197 (ws.ws_row == LINES && ws.ws_col == COLS))
198 return;
199
200 /* Update curses' internal state with new window size. */
201 resizeterm(ws.ws_row, ws.ws_col);
202
203 /*
204 * Resize each window but wait to refresh the screen until
205 * everything has been drawn so the cursor is in the right spot.
206 */
207 my_win.x_nlines = LINES / 2;
208 my_win.x_ncols = COLS;
209 wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
210 mvwin(my_win.x_win, 0, 0);
211 clearok(my_win.x_win, TRUE);
212
213 his_win.x_nlines = LINES / 2 - 1;
214 his_win.x_ncols = COLS;
215 wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
216 mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
217 clearok(his_win.x_win, TRUE);
218
219 wresize(line_win, 1, COLS);
220 mvwin(line_win, my_win.x_nlines, 0);
221 #if defined(NCURSES_VERSION) || defined(whline)
222 whline(line_win, '-', COLS);
223 #else
224 wmove(line_win, my_win.x_nlines, 0);
225 box(line_win, '-', '-');
226 #endif
227
228 /* Now redraw the screen. */
229 wrefresh(his_win.x_win);
230 wrefresh(line_win);
231 wrefresh(my_win.x_win);
232 }
233