talk.tproj/io.c

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