talk.tproj/io.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1983, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 /*
  60  * This file contains the I/O handling and the exchange of
  61  * edit characters. This connection itself is established in
  62  * ctl.c
  63  */
  64
  65 #include <sys/ioctl.h>
  66 #include <sys/time.h>
  67 #include <stdio.h>
  68 #include <errno.h>
  69 #include <string.h>
  70 #include "talk.h"
  71
  72 #define A_LONG_TIME 10000000
  73 #define STDIN_MASK (1<<fileno(stdin))   /* the bit mask for standard
  74                                            input */
  75
  76 /*
  77  * The routine to do the actual talking
  78  */
  79 talk()
  80 {
  81         register int read_template, sockt_mask;
  82         int read_set, nb;
  83         char buf[BUFSIZ];
  84         struct timeval wait;
  85
  86         message("Connection established\007\007\007");
  87         current_line = 0;
  88         sockt_mask = (1<<sockt);
  89
  90         /*
  91          * Wait on both the other process (sockt_mask) and
  92          * standard input ( STDIN_MASK )
  93          */
  94         read_template = sockt_mask | STDIN_MASK;
  95         for (;;) {
  96                 read_set = read_template;
  97                 wait.tv_sec = A_LONG_TIME;
  98                 wait.tv_usec = 0;
  99                 nb = select(32, &read_set, 0, 0, &wait);
 100                 if (nb <= 0) {
 101                         if (errno == EINTR) {
 102                                 read_set = read_template;
 103                                 continue;
 104                         }
 105                         /* panic, we don't know what happened */
 106                         p_error("Unexpected error from select");
 107                         quit();
 108                 }
 109                 if (read_set & sockt_mask) {
 110                         /* There is data on sockt */
 111                         nb = read(sockt, buf, sizeof buf);
 112                         if (nb <= 0) {
 113                                 message("Connection closed. Exiting");
 114                                 quit();
 115                         }
 116                         display(&his_win, buf, nb);
 117                 }
 118                 if (read_set & STDIN_MASK) {
 119                         /*
 120                          * We can't make the tty non_blocking, because
 121                          * curses's output routines would screw up
 122                          */
 123                         ioctl(0, FIONREAD, (struct sgttyb *) &nb);
 124                         nb = read(0, buf, nb);
 125                         display(&my_win, buf, nb);
 126                         /* might lose data here because sockt is non-blocking */
 127                         write(sockt, buf, nb);
 128                 }
 129         }
 130 }
 131
 132 /*
 133  * p_error prints the system error message on the standard location
 134  * on the screen and then exits. (i.e. a curses version of perror)
 135  */
 136 p_error(string)
 137         char *string;
 138 {
 139         wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
 140         wprintw(my_win.x_win, "[%s : %s (%d)]\n",
 141             string, strerror(errno), errno);
 142         wrefresh(my_win.x_win);
 143         move(LINES-1, 0);
 144         refresh();
 145         quit();
 146 }
 147
 148 /*
 149  * Display string in the standard location
 150  */
 151 message(string)
 152         char *string;
 153 {
 154         wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
 155         wprintw(my_win.x_win, "[%s]", string);
 156         wclrtoeol(my_win.x_win);
 157         current_line++;
 158         wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
 159         wrefresh(my_win.x_win);
 160 }