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
34 /*
35 * Initialization code for the display package,
36 * as well as the signal handling routines.
37 */
38
39 #include <sys/stat.h>
40
41 #include <err.h>
42 #include <signal.h>
43 #include <stdlib.h>
44 #include <unistd.h>
45 #include <termios.h>
46
47 #include "talk.h"
48
49 /*
50 * Make sure the callee can write to the screen
51 */
52 void
check_writeable(void)53 check_writeable(void)
54 {
55 char *tty;
56 struct stat sb;
57
58 if ((tty = ttyname(STDERR_FILENO)) == NULL)
59 err(1, "ttyname");
60 if (stat(tty, &sb) < 0)
61 err(1, "%s", tty);
62 if (!(sb.st_mode & S_IWGRP))
63 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
64 }
65
66 /*
67 * Set up curses, catch the appropriate signals,
68 * and build the various windows.
69 */
70 void
init_display(void)71 init_display(void)
72 {
73 struct sigaction sa;
74
75 if (initscr() == NULL)
76 errx(1, "Terminal type unset or lacking necessary features.");
77 (void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
78 sigaddset(&sa.sa_mask, SIGALRM);
79 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
80 curses_initialized = 1;
81 clear();
82 refresh();
83 noecho();
84 crmode();
85 signal(SIGINT, sig_sent);
86 signal(SIGPIPE, sig_sent);
87 signal(SIGWINCH, sig_winch);
88 /* curses takes care of ^Z */
89 my_win.x_nlines = LINES / 2;
90 my_win.x_ncols = COLS;
91 my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
92 idlok(my_win.x_win, TRUE);
93 scrollok(my_win.x_win, TRUE);
94 wclear(my_win.x_win);
95
96 his_win.x_nlines = LINES / 2 - 1;
97 his_win.x_ncols = COLS;
98 his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
99 my_win.x_nlines+1, 0);
100 idlok(my_win.x_win, TRUE);
101 scrollok(his_win.x_win, TRUE);
102 wclear(his_win.x_win);
103
104 line_win = newwin(1, COLS, my_win.x_nlines, 0);
105 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
106 whline(line_win, 0, COLS);
107 #else
108 box(line_win, '-', '-');
109 #endif
110 wrefresh(line_win);
111 /* let them know we are working on it */
112 current_state = "No connection yet";
113 }
114
115 /*
116 * Trade edit characters with the other talk. By agreement
117 * the first three characters each talk transmits after
118 * connection are the three edit characters.
119 */
120 void
set_edit_chars(void)121 set_edit_chars(void)
122 {
123 char buf[3];
124 int cc;
125 struct termios tio;
126
127 tcgetattr(0, &tio);
128 my_win.cerase = tio.c_cc[VERASE];
129 my_win.kill = tio.c_cc[VKILL];
130 my_win.werase = tio.c_cc[VWERASE];
131 if (my_win.cerase == (char)_POSIX_VDISABLE)
132 my_win.kill = CERASE;
133 if (my_win.kill == (char)_POSIX_VDISABLE)
134 my_win.kill = CKILL;
135 if (my_win.werase == (char)_POSIX_VDISABLE)
136 my_win.werase = CWERASE;
137 buf[0] = my_win.cerase;
138 buf[1] = my_win.kill;
139 buf[2] = my_win.werase;
140 cc = write(sockt, buf, sizeof(buf));
141 if (cc != sizeof(buf) )
142 p_error("Lost the connection");
143 cc = read(sockt, buf, sizeof(buf));
144 if (cc != sizeof(buf) )
145 p_error("Lost the connection");
146 his_win.cerase = buf[0];
147 his_win.kill = buf[1];
148 his_win.werase = buf[2];
149 }
150
151 /* ARGSUSED */
152 void
sig_sent(int signo __unused)153 sig_sent(int signo __unused)
154 {
155
156 message("Connection closing. Exiting");
157 quit();
158 }
159
160 void
sig_winch(int dummy __unused)161 sig_winch(int dummy __unused)
162 {
163
164 gotwinch = 1;
165 }
166
167 /*
168 * All done talking...hang up the phone and reset terminal thingy's
169 */
170 void
quit(void)171 quit(void)
172 {
173
174 if (curses_initialized) {
175 wmove(his_win.x_win, his_win.x_nlines-1, 0);
176 wclrtoeol(his_win.x_win);
177 wrefresh(his_win.x_win);
178 endwin();
179 }
180 if (invitation_waiting)
181 send_delete();
182 exit(0);
183 }
184
185 /*
186 * If we get SIGWINCH, recompute both window sizes and refresh things.
187 */
188 void
resize_display(void)189 resize_display(void)
190 {
191 struct winsize ws;
192
193 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
194 (ws.ws_row == LINES && ws.ws_col == COLS))
195 return;
196
197 /* Update curses' internal state with new window size. */
198 resizeterm(ws.ws_row, ws.ws_col);
199
200 /*
201 * Resize each window but wait to refresh the screen until
202 * everything has been drawn so the cursor is in the right spot.
203 */
204 my_win.x_nlines = LINES / 2;
205 my_win.x_ncols = COLS;
206 wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
207 mvwin(my_win.x_win, 0, 0);
208 clearok(my_win.x_win, TRUE);
209
210 his_win.x_nlines = LINES / 2 - 1;
211 his_win.x_ncols = COLS;
212 wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
213 mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
214 clearok(his_win.x_win, TRUE);
215
216 wresize(line_win, 1, COLS);
217 mvwin(line_win, my_win.x_nlines, 0);
218 #if defined(NCURSES_VERSION) || defined(whline)
219 whline(line_win, '-', COLS);
220 #else
221 wmove(line_win, my_win.x_nlines, 0);
222 box(line_win, '-', '-');
223 #endif
224
225 /* Now redraw the screen. */
226 wrefresh(his_win.x_win);
227 wrefresh(line_win);
228 wrefresh(my_win.x_win);
229 }
230