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 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 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 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 156 sig_sent(int signo __unused) 157 { 158 159 message("Connection closing. Exiting"); 160 quit(); 161 } 162 163 void 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 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 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