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