usr.bin/talk/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  * @(#)init_disp.c      8.2 (Berkeley) 2/16/94
  34  * $FreeBSD: src/usr.bin/talk/init_disp.c,v 1.11.2.1 2001/07/30 10:31:29 dd Exp $
  35  * $DragonFly: src/usr.bin/talk/init_disp.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
  36  */
  37
  38 /*
  39  * Initialization code for the display package,
  40  * as well as the signal handling routines.
  41  */
  42
  43 #include <err.h>
  44 #include <signal.h>
  45 #include <stdlib.h>
  46 #include <sys/stat.h>
  47 #include <unistd.h>
  48 #include <termios.h>
  49 #include "talk.h"
  50
  51 /*
  52  * Make sure the callee can write to the screen
  53  */
  54 void
  55 check_writeable(void)
  56 {
  57         char *tty;
  58         struct stat sb;
  59
  60         if ((tty = ttyname(STDERR_FILENO)) == NULL)
  61                 err(1, "ttyname");
  62         if (stat(tty, &sb) < 0)
  63                 err(1, "%s", tty);
  64         if (!(sb.st_mode & S_IWGRP))
  65                 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
  66 }
  67
  68 /*
  69  * Set up curses, catch the appropriate signals,
  70  * and build the various windows.
  71  */
  72 void
  73 init_display(void)
  74 {
  75         struct sigaction sa;
  76
  77         if (initscr() == NULL)
  78                 errx(1, "Terminal type unset or lacking necessary features.");
  79         (void) sigaction(SIGTSTP, NULL, &sa);
  80         sigaddset(&sa.sa_mask, SIGALRM);
  81         (void) sigaction(SIGTSTP, &sa, NULL);
  82         curses_initialized = 1;
  83         clear();
  84         refresh();
  85         noecho();
  86         crmode();
  87         signal(SIGINT, sig_sent);
  88         signal(SIGPIPE, sig_sent);
  89         /* curses takes care of ^Z */
  90         my_win.x_nlines = LINES / 2;
  91         my_win.x_ncols = COLS;
  92         my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
  93         idlok(my_win.x_win, TRUE);
  94         scrollok(my_win.x_win, TRUE);
  95         wclear(my_win.x_win);
  96
  97         his_win.x_nlines = LINES / 2 - 1;
  98         his_win.x_ncols = COLS;
  99         his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
 100             my_win.x_nlines+1, 0);
 101         idlok(my_win.x_win, TRUE);
 102         scrollok(his_win.x_win, TRUE);
 103         wclear(his_win.x_win);
 104
 105         line_win = newwin(1, COLS, my_win.x_nlines, 0);
 106 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
 107         whline(line_win, 0, COLS);
 108 #else
 109         box(line_win, '-', '-');
 110 #endif
 111         wrefresh(line_win);
 112         /* let them know we are working on it */
 113         current_state = "No connection yet";
 114 }
 115
 116 /*
 117  * Trade edit characters with the other talk. By agreement
 118  * the first three characters each talk transmits after
 119  * connection are the three edit characters.
 120  */
 121 void
 122 set_edit_chars(void)
 123 {
 124         char buf[3];
 125         int cc;
 126         struct termios tio;
 127
 128         tcgetattr(0, &tio);
 129         my_win.cerase = tio.c_cc[VERASE];
 130         my_win.kill = tio.c_cc[VKILL];
 131         my_win.werase = tio.c_cc[VWERASE];
 132         if (my_win.cerase == (char)_POSIX_VDISABLE)
 133                 my_win.kill = CERASE;
 134         if (my_win.kill == (char)_POSIX_VDISABLE)
 135                 my_win.kill = CKILL;
 136         if (my_win.werase == (char)_POSIX_VDISABLE)
 137                 my_win.werase = CWERASE;
 138         buf[0] = my_win.cerase;
 139         buf[1] = my_win.kill;
 140         buf[2] = my_win.werase;
 141         cc = write(sockt, buf, sizeof(buf));
 142         if (cc != sizeof(buf) )
 143                 p_error("Lost the connection");
 144         cc = read(sockt, buf, sizeof(buf));
 145         if (cc != sizeof(buf) )
 146                 p_error("Lost the connection");
 147         his_win.cerase = buf[0];
 148         his_win.kill = buf[1];
 149         his_win.werase = buf[2];
 150 }
 151
 152 /* ARGSUSED */
 153 void
 154 sig_sent(int signo)
 155 {
 156
 157         message("Connection closing. Exiting");
 158         quit();
 159 }
 160
 161 /*
 162  * All done talking...hang up the phone and reset terminal thingy's
 163  */
 164 void
 165 quit(void)
 166 {
 167
 168         if (curses_initialized) {
 169                 wmove(his_win.x_win, his_win.x_nlines-1, 0);
 170                 wclrtoeol(his_win.x_win);
 171                 wrefresh(his_win.x_win);
 172                 endwin();
 173         }
 174         if (invitation_waiting)
 175                 send_delete();
 176         exit(0);
 177 }