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. 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  * @(#)init_disp.c      8.2 (Berkeley) 2/16/94
  30  * $FreeBSD: src/usr.bin/talk/init_disp.c,v 1.11.2.1 2001/07/30 10:31:29 dd Exp $
  31  */
  32
  33 /*
  34  * Initialization code for the display package,
  35  * as well as the signal handling routines.
  36  */
  37
  38 #include <err.h>
  39 #include <signal.h>
  40 #include <stdlib.h>
  41 #include <sys/stat.h>
  42 #include <unistd.h>
  43 #include <termios.h>
  44 #include "talk.h"
  45
  46 /*
  47  * Make sure the callee can write to the screen
  48  */
  49 void
  50 check_writeable(void)
  51 {
  52         char *tty;
  53         struct stat sb;
  54
  55         if ((tty = ttyname(STDERR_FILENO)) == NULL)
  56                 err(1, "ttyname");
  57         if (stat(tty, &sb) < 0)
  58                 err(1, "%s", tty);
  59         if (!(sb.st_mode & S_IWGRP))
  60                 errx(1, "The callee cannot write to this terminal, use \"mesg y\".");
  61 }
  62
  63 /*
  64  * Set up curses, catch the appropriate signals,
  65  * and build the various windows.
  66  */
  67 void
  68 init_display(void)
  69 {
  70         struct sigaction sa;
  71
  72         if (initscr() == NULL)
  73                 errx(1, "Terminal type unset or lacking necessary features.");
  74         (void) sigaction(SIGTSTP, NULL, &sa);
  75         sigaddset(&sa.sa_mask, SIGALRM);
  76         (void) sigaction(SIGTSTP, &sa, NULL);
  77         curses_initialized = 1;
  78         clear();
  79         refresh();
  80         noecho();
  81         crmode();
  82         signal(SIGINT, sig_sent);
  83         signal(SIGPIPE, sig_sent);
  84         /* curses takes care of ^Z */
  85         my_win.x_nlines = LINES / 2;
  86         my_win.x_ncols = COLS;
  87         my_win.x_win = newwin(my_win.x_nlines, my_win.x_ncols, 0, 0);
  88         idlok(my_win.x_win, TRUE);
  89         scrollok(my_win.x_win, TRUE);
  90         wclear(my_win.x_win);
  91
  92         his_win.x_nlines = LINES / 2 - 1;
  93         his_win.x_ncols = COLS;
  94         his_win.x_win = newwin(his_win.x_nlines, his_win.x_ncols,
  95             my_win.x_nlines+1, 0);
  96         idlok(my_win.x_win, TRUE);
  97         scrollok(his_win.x_win, TRUE);
  98         wclear(his_win.x_win);
  99
 100         line_win = newwin(1, COLS, my_win.x_nlines, 0);
 101 #if defined(hline) || defined(whline) || defined(NCURSES_VERSION)
 102         whline(line_win, 0, COLS);
 103 #else
 104         box(line_win, '-', '-');
 105 #endif
 106         wrefresh(line_win);
 107         /* let them know we are working on it */
 108         current_state = "No connection yet";
 109 }
 110
 111 /*
 112  * Trade edit characters with the other talk. By agreement
 113  * the first three characters each talk transmits after
 114  * connection are the three edit characters.
 115  */
 116 void
 117 set_edit_chars(void)
 118 {
 119         char buf[3];
 120         int cc;
 121         struct termios tio;
 122
 123         tcgetattr(0, &tio);
 124         my_win.cerase = tio.c_cc[VERASE];
 125         my_win.kill = tio.c_cc[VKILL];
 126         my_win.werase = tio.c_cc[VWERASE];
 127         if (my_win.cerase == (char)_POSIX_VDISABLE)
 128                 my_win.kill = CERASE;
 129         if (my_win.kill == (char)_POSIX_VDISABLE)
 130                 my_win.kill = CKILL;
 131         if (my_win.werase == (char)_POSIX_VDISABLE)
 132                 my_win.werase = CWERASE;
 133         buf[0] = my_win.cerase;
 134         buf[1] = my_win.kill;
 135         buf[2] = my_win.werase;
 136         cc = write(sockt, buf, sizeof(buf));
 137         if (cc != sizeof(buf) )
 138                 p_error("Lost the connection");
 139         cc = read(sockt, buf, sizeof(buf));
 140         if (cc != sizeof(buf) )
 141                 p_error("Lost the connection");
 142         his_win.cerase = buf[0];
 143         his_win.kill = buf[1];
 144         his_win.werase = buf[2];
 145 }
 146
 147 /* ARGSUSED */
 148 void
 149 sig_sent(int signo __unused)
 150 {
 151
 152         message("Connection closing. Exiting");
 153         quit();
 154 }
 155
 156 /*
 157  * All done talking...hang up the phone and reset terminal thingy's
 158  */
 159 void
 160 quit(void)
 161 {
 162
 163         if (curses_initialized) {
 164                 wmove(his_win.x_win, his_win.x_nlines-1, 0);
 165                 wclrtoeol(his_win.x_win);
 166                 wrefresh(his_win.x_win);
 167                 endwin();
 168         }
 169         if (invitation_waiting)
 170                 send_delete();
 171         exit(0);
 172 }