remote_cmds/talk.tproj/init_disp.c

   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 #ifndef __APPLE__
  37 __FBSDID("$FreeBSD: src/usr.bin/talk/init_disp.c,v 1.14 2004/04/19 21:37:28 cognet Exp $");
  38
  39 #ifndef lint
  40 static const char sccsid[] = "@(#)init_disp.c   8.2 (Berkeley) 2/16/94";
  41 #endif
  42 #endif /* __APPLE__ */
  43
  44 /*
  45  * Initialization code for the display package,
  46  * as well as the signal handling routines.
  47  */
  48
  49 #include <sys/stat.h>
  50 #ifdef __APPLE__
  51 #include <sys/ioctl.h>
  52 #endif
  53
  54 #include <err.h>
  55 #include <signal.h>
  56 #include <stdlib.h>
  57 #include <unistd.h>
  58 #include <termios.h>
  59
  60 #include "talk.h"
  61
  62 extern volatile sig_atomic_t gotwinch;
  63
  64 /*
  65  * Make sure the callee can write to the screen
  66  */
  67 void
  68 check_writeable()
  69 {
  70         char *tty;
  71         struct stat sb;
  72
  73         if ((tty = ttyname(STDERR_FILENO)) == NULL)
  74                 err(1, "ttyname");
  75         if (stat(tty, &sb) < 0)
  76                 err(1, "%s", tty);
  77         if (!(sb.st_mode & S_IWGRP))
  78                 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
  79 }
  80
  81 /*
  82  * Set up curses, catch the appropriate signals,
  83  * and build the various windows.
  84  */
  85 void
  86 init_display()
  87 {
  88         struct sigaction sa;
  89
  90         if (initscr() == NULL)
  91                 errx(1, "Terminal type unset or lacking necessary features.");
  92         (void) sigaction(SIGTSTP, (struct sigaction *)0, &sa);
  93         sigaddset(&sa.sa_mask, SIGALRM);
  94         (void) sigaction(SIGTSTP, &sa, (struct sigaction *)0);
  95         curses_initialized = 1;
  96         clear();
  97         refresh();
  98         noecho();
  99         crmode();
 100         signal(SIGINT, sig_sent);
 101         signal(SIGPIPE, sig_sent);
 102         signal(SIGWINCH, sig_winch);
 103         /* curses takes care of ^Z */
 104         my_win.x_nlines = LINES / 2;
 105         my_win.x_ncols = COLS;
 106         my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
 107         idlok(my_win.x_win, TRUE);
 108         scrollok(my_win.x_win, TRUE);
 109         wclear(my_win.x_win);
 110
 111         his_win.x_nlines = LINES / 2 - 1;
 112         his_win.x_ncols = COLS;
 113         his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
 114             my_win.x_nlines+1, 0);
 115         idlok(my_win.x_win, TRUE);
 116         scrollok(his_win.x_win, TRUE);
 117         wclear(his_win.x_win);
 118
 119         line_win = newwin(1, COLS, my_win.x_nlines, 0);
 120 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
 121         whline(line_win, 0, COLS);
 122 #else
 123         box(line_win, '-', '-');
 124 #endif
 125         wrefresh(line_win);
 126         /* let them know we are working on it */
 127         current_state = "No connection yet";
 128 }
 129
 130 /*
 131  * Trade edit characters with the other talk. By agreement
 132  * the first three characters each talk transmits after
 133  * connection are the three edit characters.
 134  */
 135 void
 136 set_edit_chars()
 137 {
 138         char buf[3];
 139         int cc;
 140         struct termios tio;
 141
 142         tcgetattr(0, &tio);
 143         my_win.cerase = tio.c_cc[VERASE];
 144         my_win.kill = tio.c_cc[VKILL];
 145         my_win.werase = tio.c_cc[VWERASE];
 146         if (my_win.cerase == (char)_POSIX_VDISABLE)
 147                 my_win.kill = CERASE;
 148         if (my_win.kill == (char)_POSIX_VDISABLE)
 149                 my_win.kill = CKILL;
 150         if (my_win.werase == (char)_POSIX_VDISABLE)
 151                 my_win.werase = CWERASE;
 152         buf[0] = my_win.cerase;
 153         buf[1] = my_win.kill;
 154         buf[2] = my_win.werase;
 155         cc = write(sockt, buf, sizeof(buf));
 156         if (cc != sizeof(buf) )
 157                 p_error("Lost the connection");
 158         cc = read(sockt, buf, sizeof(buf));
 159         if (cc != sizeof(buf) )
 160                 p_error("Lost the connection");
 161         his_win.cerase = buf[0];
 162         his_win.kill = buf[1];
 163         his_win.werase = buf[2];
 164 }
 165
 166 /* ARGSUSED */
 167 void
 168 sig_sent(signo)
 169         int signo __unused;
 170 {
 171
 172         message("Connection closing. Exiting");
 173         quit();
 174 }
 175
 176 void
 177 sig_winch(int dummy)
 178 {
 179
 180         gotwinch = 1;
 181 }
 182
 183 /*
 184  * All done talking...hang up the phone and reset terminal thingy's
 185  */
 186 void
 187 quit()
 188 {
 189
 190         if (curses_initialized) {
 191                 wmove(his_win.x_win, his_win.x_nlines-1, 0);
 192                 wclrtoeol(his_win.x_win);
 193                 wrefresh(his_win.x_win);
 194                 endwin();
 195         }
 196         if (invitation_waiting)
 197                 send_delete();
 198         exit(0);
 199 }
 200
 201 /*
 202  * If we get SIGWINCH, recompute both window sizes and refresh things.
 203  */
 204 void
 205 resize_display(void)
 206 {
 207         struct winsize ws;
 208
 209         if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) < 0 ||
 210             (ws.ws_row == LINES && ws.ws_col == COLS))
 211                 return;
 212
 213         /* Update curses' internal state with new window size. */
 214         resizeterm(ws.ws_row, ws.ws_col);
 215
 216         /*
 217          * Resize each window but wait to refresh the screen until
 218          * everything has been drawn so the cursor is in the right spot.
 219          */
 220         my_win.x_nlines = LINES / 2;
 221         my_win.x_ncols = COLS;
 222         wresize(my_win.x_win, my_win.x_nlines, my_win.x_ncols);
 223         mvwin(my_win.x_win, 0, 0);
 224         clearok(my_win.x_win, TRUE);
 225
 226         his_win.x_nlines = LINES / 2 - 1;
 227         his_win.x_ncols = COLS;
 228         wresize(his_win.x_win, his_win.x_nlines, his_win.x_ncols);
 229         mvwin(his_win.x_win, my_win.x_nlines + 1, 0);
 230         clearok(his_win.x_win, TRUE);
 231
 232         wresize(line_win, 1, COLS);
 233         mvwin(line_win, my_win.x_nlines, 0);
 234 #if defined(NCURSES_VERSION) || defined(whline)
 235         whline(line_win, '-', COLS);
 236 #else
 237         wmove(line_win, my_win.x_nlines, 0);
 238         box(line_win, '-', '-');
 239 #endif
 240
 241         /* Now redraw the screen. */
 242         wrefresh(his_win.x_win);
 243         wrefresh(line_win);
 244         wrefresh(my_win.x_win);
 245 }