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 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 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 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 153 sig_sent(int signo __unused) 154 { 155 156 message("Connection closing. Exiting"); 157 quit(); 158 } 159 160 void 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 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 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