src/tee.c

   1 /* tee - read from standard input and write to standard output and files.
   2    Copyright (C) 85,90,91,92,93,94,95,96,1997 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 2, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Mike Parker, Richard M. Stallman, and David MacKenzie */
  19
  20 #include <config.h>
  21 #include <stdio.h>
  22 #include <sys/types.h>
  23 #include <signal.h>
  24 #include <getopt.h>
  25
  26 #include "system.h"
  27 #include "error.h"
  28
  29 int full_write ();
  30
  31 static int tee PARAMS ((int nfiles, const char **files));
  32
  33 /* If nonzero, append to output files rather than truncating them. */
  34 static int append;
  35
  36 /* If nonzero, ignore interrupts. */
  37 static int ignore_interrupts;
  38
  39 /* The name that this program was run with. */
  40 char *program_name;
  41
  42 /* If nonzero, display usage information and exit.  */
  43 static int show_help;
  44
  45 /* If nonzero, print the version on standard output and exit.  */
  46 static int show_version;
  47
  48 static struct option const long_options[] =
  49 {
  50   {"append", no_argument, NULL, 'a'},
  51   {"help", no_argument, &show_help, 1},
  52   {"ignore-interrupts", no_argument, NULL, 'i'},
  53   {"version", no_argument, &show_version, 1},
  54   {NULL, 0, NULL, 0}
  55 };
  56
  57 static void
  58 usage (int status)
  59 {
  60   if (status != 0)
  61     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  62              program_name);
  63   else
  64     {
  65       printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name);
  66       printf (_("\
  67 Copy standard input to each FILE, and also to standard output.\n\
  68 \n\
  69   -a, --append              append to the given FILEs, do not overwrite\n\
  70   -i, --ignore-interrupts   ignore interrupt signals\n\
  71       --help                display this help and exit\n\
  72       --version             output version information and exit\n\
  73 "));
  74       puts (_("\nReport bugs to <bug-sh-utils@gnu.org>."));
  75     }
  76   exit (status);
  77 }
  78
  79 int
  80 main (int argc, char **argv)
  81 {
  82   int errs;
  83   int optc;
  84
  85   program_name = argv[0];
  86   setlocale (LC_ALL, "");
  87   bindtextdomain (PACKAGE, LOCALEDIR);
  88   textdomain (PACKAGE);
  89
  90   append = 0;
  91   ignore_interrupts = 0;
  92
  93   while ((optc = getopt_long (argc, argv, "ai", long_options, NULL)) != -1)
  94     {
  95       switch (optc)
  96         {
  97         case 0:
  98           break;
  99
 100         case 'a':
 101           append = 1;
 102           break;
 103
 104         case 'i':
 105           ignore_interrupts = 1;
 106           break;
 107
 108         default:
 109           usage (1);
 110         }
 111     }
 112
 113   if (show_version)
 114     {
 115       printf ("tee (%s) %s\n", GNU_PACKAGE, VERSION);
 116       exit (0);
 117     }
 118
 119   if (show_help)
 120     usage (0);
 121
 122   if (ignore_interrupts)
 123     {
 124 #ifdef _POSIX_SOURCE
 125       struct sigaction sigact;
 126
 127       sigact.sa_handler = SIG_IGN;
 128       sigemptyset (&sigact.sa_mask);
 129       sigact.sa_flags = 0;
 130       sigaction (SIGINT, &sigact, NULL);
 131 #else                           /* !_POSIX_SOURCE */
 132       signal (SIGINT, SIG_IGN);
 133 #endif                          /* _POSIX_SOURCE */
 134     }
 135
 136   /* Don't let us be killed if one of the output files is a pipe that
 137      doesn't consume all its input.  */
 138 #ifdef _POSIX_SOURCE
 139   {
 140     struct sigaction sigact;
 141
 142     sigact.sa_handler = SIG_IGN;
 143     sigemptyset (&sigact.sa_mask);
 144     sigact.sa_flags = 0;
 145     sigaction (SIGPIPE, &sigact, NULL);
 146   }
 147 #else
 148   signal (SIGPIPE, SIG_IGN);
 149 #endif
 150
 151   errs = tee (argc - optind, (const char **) &argv[optind]);
 152   if (close (0) != 0)
 153     error (1, errno, _("standard input"));
 154   if (close (1) != 0)
 155     error (1, errno, _("standard output"));
 156   exit (errs);
 157 }
 158
 159 /* Copy the standard input into each of the NFILES files in FILES
 160    and into the standard output.
 161    Return 0 if successful, 1 if any errors occur. */
 162
 163 static int
 164 tee (int nfiles, const char **files)
 165 {
 166   int *descriptors;
 167   char buffer[BUFSIZ];
 168   register int bytes_read, i, ret = 0, mode;
 169
 170   descriptors = (int *) xmalloc ((nfiles + 1) * sizeof (int));
 171
 172   mode = O_WRONLY | O_CREAT;
 173   if (append)
 174     mode |= O_APPEND;
 175   else
 176     mode |= O_TRUNC;
 177
 178   /* Move all the names `up' one in the argv array to make room for
 179      the entry for standard output.  This writes into argv[argc].  */
 180   for (i = nfiles; i >= 1; i--)
 181     files[i] = files[i - 1];
 182
 183   /* In the array of NFILES + 1 descriptors, make
 184      the first one correspond to standard output.   */
 185   descriptors[0] = 1;
 186   files[0] = _("standard output");
 187
 188   for (i = 1; i <= nfiles; i++)
 189     {
 190       descriptors[i] = open (files[i], mode, 0666);
 191       if (descriptors[i] == -1)
 192         {
 193           error (0, errno, "%s", files[i]);
 194           ret = 1;
 195         }
 196     }
 197
 198   while (1)
 199     {
 200       bytes_read = read (0, buffer, sizeof buffer);
 201 #ifdef EINTR
 202       if (bytes_read < 0 && errno == EINTR)
 203         continue;
 204 #endif
 205       if (bytes_read <= 0)
 206         break;
 207
 208       /* Write to all NFILES + 1 descriptors.
 209          Standard output is the first one.  */
 210       for (i = 0; i <= nfiles; i++)
 211         {
 212           if (descriptors[i] != -1
 213               && full_write (descriptors[i], buffer, bytes_read) < 0)
 214             {
 215               error (0, errno, "%s", files[i]);
 216               /* Don't close stdout.  That's done in main.  */
 217               if (descriptors[i] != 1)
 218                 close (descriptors[i]);
 219               descriptors[i] = -1;
 220               ret = 1;
 221             }
 222         }
 223     }
 224
 225   if (bytes_read == -1)
 226     {
 227       error (0, errno, _("read error"));
 228       ret = 1;
 229     }
 230
 231   /* Close the files, but not standard output.  */
 232   for (i = 1; i <= nfiles; i++)
 233     if (descriptors[i] != -1 && close (descriptors[i]) != 0)
 234       {
 235         error (0, errno, "%s", files[i]);
 236         ret = 1;
 237       }
 238
 239   free (descriptors);
 240
 241   return ret;
 242 }