talk.tproj/io.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * "Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.0 (the 'License').  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License."
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1983, 1993
  26  *      The Regents of the University of California.  All rights reserved.
  27  *
  28  * Redistribution and use in source and binary forms, with or without
  29  * modification, are permitted provided that the following conditions
  30  * are met:
  31  * 1. Redistributions of source code must retain the above copyright
  32  *    notice, this list of conditions and the following disclaimer.
  33  * 2. Redistributions in binary form must reproduce the above copyright
  34  *    notice, this list of conditions and the following disclaimer in the
  35  *    documentation and/or other materials provided with the distribution.
  36  * 3. All advertising materials mentioning features or use of this software
  37  *    must display the following acknowledgement:
  38  *      This product includes software developed by the University of
  39  *      California, Berkeley and its contributors.
  40  * 4. Neither the name of the University nor the names of its contributors
  41  *    may be used to endorse or promote products derived from this software
  42  *    without specific prior written permission.
  43  *
  44  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  45  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  46  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  47  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  48  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  49  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  50  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  51  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  52  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  53  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  54  * SUCH DAMAGE.
  55  */
  56
  57
  58 /*
  59  * This file contains the I/O handling and the exchange of
  60  * edit characters. This connection itself is established in
  61  * ctl.c
  62  */
  63
  64 #include <sys/ioctl.h>
  65 #include <sys/time.h>
  66 #include <stdio.h>
  67 #include <errno.h>
  68 #include <string.h>
  69 #include "talk.h"
  70
  71 #define A_LONG_TIME 10000000
  72 #define STDIN_MASK (1<<fileno(stdin))   /* the bit mask for standard
  73                                            input */
  74
  75 /*
  76  * The routine to do the actual talking
  77  */
  78 talk()
  79 {
  80         register int read_template, sockt_mask;
  81         int read_set, nb;
  82         char buf[BUFSIZ];
  83         struct timeval wait;
  84
  85         message("Connection established\007\007\007");
  86         current_line = 0;
  87         sockt_mask = (1<<sockt);
  88
  89         /*
  90          * Wait on both the other process (sockt_mask) and
  91          * standard input ( STDIN_MASK )
  92          */
  93         read_template = sockt_mask | STDIN_MASK;
  94         for (;;) {
  95                 read_set = read_template;
  96                 wait.tv_sec = A_LONG_TIME;
  97                 wait.tv_usec = 0;
  98                 nb = select(32, &read_set, 0, 0, &wait);
  99                 if (nb <= 0) {
 100                         if (errno == EINTR) {
 101                                 read_set = read_template;
 102                                 continue;
 103                         }
 104                         /* panic, we don't know what happened */
 105                         p_error("Unexpected error from select");
 106                         quit();
 107                 }
 108                 if (read_set & sockt_mask) {
 109                         /* There is data on sockt */
 110                         nb = read(sockt, buf, sizeof buf);
 111                         if (nb <= 0) {
 112                                 message("Connection closed. Exiting");
 113                                 quit();
 114                         }
 115                         display(&his_win, buf, nb);
 116                 }
 117                 if (read_set & STDIN_MASK) {
 118                         /*
 119                          * We can't make the tty non_blocking, because
 120                          * curses's output routines would screw up
 121                          */
 122                         ioctl(0, FIONREAD, (struct sgttyb *) &nb);
 123                         nb = read(0, buf, nb);
 124                         display(&my_win, buf, nb);
 125                         /* might lose data here because sockt is non-blocking */
 126                         write(sockt, buf, nb);
 127                 }
 128         }
 129 }
 130
 131 /*
 132  * p_error prints the system error message on the standard location
 133  * on the screen and then exits. (i.e. a curses version of perror)
 134  */
 135 p_error(string)
 136         char *string;
 137 {
 138         wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
 139         wprintw(my_win.x_win, "[%s : %s (%d)]\n",
 140             string, strerror(errno), errno);
 141         wrefresh(my_win.x_win);
 142         move(LINES-1, 0);
 143         refresh();
 144         quit();
 145 }
 146
 147 /*
 148  * Display string in the standard location
 149  */
 150 message(string)
 151         char *string;
 152 {
 153         wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
 154         wprintw(my_win.x_win, "[%s]", string);
 155         wclrtoeol(my_win.x_win);
 156         current_line++;
 157         wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
 158         wrefresh(my_win.x_win);
 159 }