1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/cdefs.h> 35 36 __FBSDID("$FreeBSD$"); 37 38 #ifndef lint 39 static const char sccsid[] = "@(#)init_disp.c 8.2 (Berkeley) 2/16/94"; 40 #endif 41 42 /* 43 * Initialization code for the display package, 44 * as well as the signal handling routines. 45 */ 46 47 #include <sys/stat.h> 48 49 #include <err.h> 50 #include <signal.h> 51 #include <stdlib.h> 52 #include <unistd.h> 53 #include <termios.h> 54 55 #include "talk.h" 56 57 extern volatile sig_atomic_t gotwinch; 58 59 /* 60 * Make sure the callee can write to the screen 61 */ 62 void 63 check_writeable(void) 64 { 65 char *tty; 66 struct stat sb; 67 68 if ((tty = ttyname(STDERR_FILENO)) == NULL) 69 err(1, "ttyname"); 70 if (stat(tty, &sb) < 0) 71 err(1, "%s", tty); 72 if (!(sb.st_mode & S_IWGRP)) 73 errx(1, "The callee cannot write to this terminal, use \"mesg y\"."); 74 } 75 76 /* 77 * Set up curses, catch the appropriate signals, 78 * and build the various windows. 79 */ 80 void 81 init_display(void) 82 { 83 struct sigaction sa; 84 85 if (initscr() == NULL) 86 errx(1, "Terminal type unset or lacking necessary features."); 87 (void) sigaction(SIGTSTP, (struct sigaction *)0, &sa); 88 sigaddset(&sa.sa_mask, SIGALRM); 89 (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0); 90 curses_initialized = 1; 91 clear(); 92 refresh(); 93 noecho(); 94 crmode(); 95 signal(SIGINT, sig_sent); 96 signal(SIGPIPE, sig_sent); 97 signal(SIGWINCH, sig_winch); 98 /* curses takes care of ^Z */ 99 my_win.x_nlines = LINES / 2; 100 my_win.x_ncols = COLS; 101 my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0); 102 idlok(my_win.x_win, TRUE); 103 scrollok(my_win.x_win, TRUE); 104 wclear(my_win.x_win); 105 106 his_win.x_nlines = LINES / 2 - 1; 107 his_win.x_ncols = COLS; 108 his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols, 109 my_win.x_nlines+1, 0); 110 idlok(my_win.x_win, TRUE); 111 scrollok(his_win.x_win, TRUE); 112 wclear(his_win.x_win); 113 114 line_win = newwin(1, COLS, my_win.x_nlines, 0); 115 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION) 116 whline(line_win, 0, COLS); 117 #else 118 box(line_win, '-', '-'); 119 #endif 120 wrefresh(line_win); 121 /* let them know we are working on it */ 122 current_state = "No connection yet"; 123 } 124 125 /* 126 * Trade edit characters with the other talk. By agreement 127 * the first three characters each talk transmits after 128 * connection are the three edit characters. 129 */ 130 void 131 set_edit_chars(void) 132 { 133 char buf[3]; 134 int cc; 135 struct termios tio; 136 137 tcgetattr(0, &tio); 138 my_win.cerase = tio.c_cc[VERASE]; 139 my_win.kill = tio.c_cc[VKILL]; 140 my_win.werase = tio.c_cc[VWERASE]; 141 if (my_win.cerase == (char)_POSIX_VDISABLE) 142 my_win.kill = CERASE; 143 if (my_win.kill == (char)_POSIX_VDISABLE) 144 my_win.kill = CKILL; 145 if (my_win.werase == (char)_POSIX_VDISABLE) 146 my_win.werase = CWERASE; 147 buf[0] = my_win.cerase; 148 buf[1] = my_win.kill; 149 buf[2] = my_win.werase; 150 cc = write(sockt, buf, sizeof(buf)); 151 if (cc != sizeof(buf) ) 152 p_error("Lost the connection"); 153 cc = read(sockt, buf, sizeof(buf)); 154 if (cc != sizeof(buf) ) 155 p_error("Lost the connection"); 156 his_win.cerase = buf[0]; 157 his_win.kill = buf[1]; 158 his_win.werase = buf[2]; 159 } 160 161 /* ARGSUSED */ 162 void 163 sig_sent(int signo __unused) 164 { 165 166 message("Connection closing. Exiting"); 167 quit(); 168 } 169 170 void 171 sig_winch(int dummy __unused) 172 { 173 174 gotwinch = 1; 175 } 176 177 /* 178 * All done talking...hang up the phone and reset terminal thingy's 179 */ 180 void 181 quit(void) 182 { 183 184 if (curses_initialized) { 185 wmove(his_win.x_win, his_win.x_nlines-1, 0); 186 wclrtoeol(his_win.x_win); 187 wrefresh(his_win.x_win); 188 endwin(); 189 } 190 if (invitation_waiting) 191 send_delete(); 192 exit(0); 193 } 194 195 /* 196 * If we get SIGWINCH, recompute both window sizes and refresh things. 197 */ 198 void 199 resize_display(void) 200 { 201 struct winsize ws; 202 203 if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 || 204 (ws.ws_row == LINES && ws.ws_col == COLS)) 205 return; 206 207 /* Update curses' internal state with new window size. */ 208 resizeterm(ws.ws_row, ws.ws_col); 209 210 /* 211 * Resize each window but wait to refresh the screen until 212 * everything has been drawn so the cursor is in the right spot. 213 */ 214 my_win.x_nlines = LINES / 2; 215 my_win.x_ncols = COLS; 216 wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols); 217 mvwin(my_win.x_win, 0, 0); 218 clearok(my_win.x_win, TRUE); 219 220 his_win.x_nlines = LINES / 2 - 1; 221 his_win.x_ncols = COLS; 222 wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols); 223 mvwin(his_win.x_win, my_win.x_nlines + 1, 0); 224 clearok(his_win.x_win, TRUE); 225 226 wresize(line_win, 1, COLS); 227 mvwin(line_win, my_win.x_nlines, 0); 228 #if defined(NCURSES_VERSION) || defined(whline) 229 whline(line_win, '-', COLS); 230 #else 231 wmove(line_win, my_win.x_nlines, 0); 232 box(line_win, '-', '-'); 233 #endif 234 235 /* Now redraw the screen. */ 236 wrefresh(his_win.x_win); 237 wrefresh(line_win); 238 wrefresh(my_win.x_win); 239 } 240