1 /* $OpenBSD: init_disp.c,v 1.23 2019/06/28 13:35:04 deraadt Exp $ */
2 /* $NetBSD: init_disp.c,v 1.6 1994/12/09 02:14:17 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1983, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*
34 * Initialization code for the display package,
35 * as well as the signal handling routines.
36 */
37
38 #include <sys/ioctl.h>
39
40 #include <err.h>
41 #include <stdlib.h>
42 #include <termios.h>
43 #include <unistd.h>
44
45 #include "talk.h"
46
47 /*
48 * Set up curses, catch the appropriate signals,
49 * and build the various windows.
50 */
51 void
init_display(void)52 init_display(void)
53 {
54 struct sigaction sa;
55
56 if (initscr() == NULL)
57 errx(1, "Terminal type unset or lacking necessary features.");
58 (void) sigaction(SIGTSTP, NULL, &sa);
59 sigaddset(&sa.sa_mask, SIGALRM);
60 (void) sigaction(SIGTSTP, &sa, NULL);
61 curses_initialized = 1;
62 clear();
63 refresh();
64 noecho();
65 cbreak();
66 signal(SIGINT, sig_sent);
67 signal(SIGPIPE, sig_sent);
68 signal(SIGWINCH, sig_winch);
69 /* curses takes care of ^Z */
70 my_win.x_nlines = LINES / 2;
71 my_win.x_ncols = COLS;
72 my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
73 scrollok(my_win.x_win, smooth_scroll);
74 wclear(my_win.x_win);
75
76 his_win.x_nlines = LINES / 2 - 1;
77 his_win.x_ncols = COLS;
78 his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
79 my_win.x_nlines+1, 0);
80 scrollok(his_win.x_win, smooth_scroll);
81 wclear(his_win.x_win);
82
83 line_win = newwin(1, COLS, my_win.x_nlines, 0);
84 #if defined(NCURSES_VERSION) || defined(whline)
85 whline(line_win, '-', COLS);
86 #else
87 box(line_win, '-', '-');
88 #endif
89 wrefresh(line_win);
90 /* let them know we are working on it */
91 current_state = "No connection yet";
92 }
93
94 /*
95 * Trade edit characters with the other talk. By agreement
96 * the first three characters each talk transmits after
97 * connection are the three edit characters.
98 */
99 void
set_edit_chars(void)100 set_edit_chars(void)
101 {
102 u_char buf[3];
103 int cc;
104 struct termios tty;
105
106 tcgetattr(STDIN_FILENO, &tty);
107 buf[0] = my_win.cerase = (tty.c_cc[VERASE] == (u_char)_POSIX_VDISABLE)
108 ? CERASE : tty.c_cc[VERASE];
109 buf[1] = my_win.kill = (tty.c_cc[VKILL] == (u_char)_POSIX_VDISABLE)
110 ? CKILL : tty.c_cc[VKILL];
111 buf[2] = my_win.werase = (tty.c_cc[VWERASE] == (u_char)_POSIX_VDISABLE)
112 ? CWERASE : tty.c_cc[VWERASE];
113 cc = write(sockt, buf, sizeof(buf));
114 if (cc != sizeof(buf) )
115 quit("Lost the connection", 1);
116 cc = read(sockt, buf, sizeof(buf));
117 if (cc != sizeof(buf) )
118 quit("Lost the connection", 1);
119 his_win.cerase = buf[0];
120 his_win.kill = buf[1];
121 his_win.werase = buf[2];
122 }
123
124 void
sig_sent(int dummy)125 sig_sent(int dummy)
126 {
127
128 quit("Connection closing. Exiting", 0);
129 }
130
131 void
sig_winch(int dummy)132 sig_winch(int dummy)
133 {
134
135 gotwinch = 1;
136 }
137
138 /*
139 * All done talking...hang up the phone and reset terminal thingy's
140 */
141 void
quit(char * warning,int do_perror)142 quit(char *warning, int do_perror)
143 {
144
145 if (curses_initialized) {
146 wmove(his_win.x_win, his_win.x_nlines-1, 0);
147 wclrtoeol(his_win.x_win);
148 wrefresh(his_win.x_win);
149 endwin();
150 }
151 if (invitation_waiting)
152 send_delete();
153 if (warning) {
154 if (do_perror)
155 warn("%s", warning);
156 else
157 warnx("%s", warning);
158 }
159 exit(0);
160 }
161
162 /*
163 * If we get SIGWINCH, recompute both window sizes and refresh things.
164 */
165 void
resize_display(void)166 resize_display(void)
167 {
168 struct winsize ws;
169
170 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1 ||
171 (ws.ws_row == LINES && ws.ws_col == COLS))
172 return;
173
174 /* Update curses' internal state with new window size. */
175 resizeterm(ws.ws_row, ws.ws_col);
176
177 /*
178 * Resize each window but wait to refresh the screen until
179 * everything has been drawn so the cursor is in the right spot.
180 */
181 my_win.x_nlines = LINES / 2;
182 my_win.x_ncols = COLS;
183 wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
184 mvwin(my_win.x_win, 0, 0);
185 clearok(my_win.x_win, TRUE);
186
187 his_win.x_nlines = LINES / 2 - 1;
188 his_win.x_ncols = COLS;
189 wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
190 mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
191 clearok(his_win.x_win, TRUE);
192
193 wresize(line_win, 1, COLS);
194 mvwin(line_win, my_win.x_nlines, 0);
195 #if defined(NCURSES_VERSION) || defined(whline)
196 whline(line_win, '-', COLS);
197 #else
198 wmove(line_win, my_win.x_nlines, 0);
199 box(line_win, '-', '-');
200 #endif
201
202 /* Now redraw the screen. */
203 wrefresh(his_win.x_win);
204 wrefresh(line_win);
205 wrefresh(my_win.x_win);
206 }
207