src/tee.c

   1 /* tee - read from standard input and write to standard output and files.
   2    Copyright (C) 85,1990-2000 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 "closeout.h"
  28 #include "error.h"
  29
  30 /* The official name of this program (e.g., no `g' prefix).  */
  31 #define PROGRAM_NAME "tee"
  32
  33 #define AUTHORS "Mike Parker, Richard M. Stallman, and David MacKenzie"
  34
  35 int full_write ();
  36
  37 static int tee PARAMS ((int nfiles, const char **files));
  38
  39 /* If nonzero, append to output files rather than truncating them. */
  40 static int append;
  41
  42 /* If nonzero, ignore interrupts. */
  43 static int ignore_interrupts;
  44
  45 /* The name that this program was run with. */
  46 char *program_name;
  47
  48 static struct option const long_options[] =
  49 {
  50   {"append", no_argument, NULL, 'a'},
  51   {"ignore-interrupts", no_argument, NULL, 'i'},
  52   {GETOPT_HELP_OPTION_DECL},
  53   {GETOPT_VERSION_OPTION_DECL},
  54   {NULL, 0, NULL, 0}
  55 };
  56
  57 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   atexit (close_stdout);
  91
  92   append = 0;
  93   ignore_interrupts = 0;
  94
  95   while ((optc = getopt_long (argc, argv, "ai", long_options, NULL)) != -1)
  96     {
  97       switch (optc)
  98         {
  99         case 0:
 100           break;
 101
 102         case 'a':
 103           append = 1;
 104           break;
 105
 106         case 'i':
 107           ignore_interrupts = 1;
 108           break;
 109
 110         case_GETOPT_HELP_CHAR;
 111
 112         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 113
 114         default:
 115           usage (1);
 116         }
 117     }
 118
 119   if (ignore_interrupts)
 120     {
 121 #ifdef _POSIX_SOURCE
 122       struct sigaction sigact;
 123
 124       sigact.sa_handler = SIG_IGN;
 125       sigemptyset (&sigact.sa_mask);
 126       sigact.sa_flags = 0;
 127       sigaction (SIGINT, &sigact, NULL);
 128 #else                           /* !_POSIX_SOURCE */
 129       signal (SIGINT, SIG_IGN);
 130 #endif                          /* _POSIX_SOURCE */
 131     }
 132
 133   /* Don't let us be killed if one of the output files is a pipe that
 134      doesn't consume all its input.  */
 135 #ifdef _POSIX_SOURCE
 136   {
 137     struct sigaction sigact;
 138
 139     sigact.sa_handler = SIG_IGN;
 140     sigemptyset (&sigact.sa_mask);
 141     sigact.sa_flags = 0;
 142     sigaction (SIGPIPE, &sigact, NULL);
 143   }
 144 #else
 145   signal (SIGPIPE, SIG_IGN);
 146 #endif
 147
 148   /* Do *not* warn if tee is given no file arguments.
 149      POSIX requires that it work when given no arguments.  */
 150
 151   errs = tee (argc - optind, (const char **) &argv[optind]);
 152   if (close (0) != 0)
 153     error (1, errno, _("standard input"));
 154
 155   exit (errs);
 156 }
 157
 158 /* Copy the standard input into each of the NFILES files in FILES
 159    and into the standard output.
 160    Return 0 if successful, 1 if any errors occur. */
 161
 162 static int
 163 tee (int nfiles, const char **files)
 164 {
 165   FILE **descriptors;
 166   char buffer[BUFSIZ];
 167   int bytes_read, i;
 168   int ret = 0;
 169   const char *mode_string = (append ? "a" : "w");
 170
 171   descriptors = (FILE **) xmalloc ((nfiles + 1) * sizeof (descriptors[0]));
 172
 173   /* Move all the names `up' one in the argv array to make room for
 174      the entry for standard output.  This writes into argv[argc].  */
 175   for (i = nfiles; i >= 1; i--)
 176     files[i] = files[i - 1];
 177
 178   SET_BINARY2 (0, 1);
 179
 180   /* In the array of NFILES + 1 descriptors, make
 181      the first one correspond to standard output.   */
 182   descriptors[0] = stdout;
 183   files[0] = _("standard output");
 184   SETVBUF (stdout, NULL, _IONBF, 0);
 185
 186   for (i = 1; i <= nfiles; i++)
 187     {
 188       descriptors[i] = fopen (files[i], mode_string);
 189       if (descriptors[i] == NULL)
 190         {
 191           error (0, errno, "%s", files[i]);
 192           ret = 1;
 193         }
 194       else
 195         {
 196           SETVBUF (descriptors[i], NULL, _IONBF, 0);
 197           SET_BINARY (fileno (descriptors[i]));
 198         }
 199     }
 200
 201   while (1)
 202     {
 203       bytes_read = read (0, buffer, sizeof buffer);
 204 #ifdef EINTR
 205       if (bytes_read < 0 && errno == EINTR)
 206         continue;
 207 #endif
 208       if (bytes_read <= 0)
 209         break;
 210
 211       /* Write to all NFILES + 1 descriptors.
 212          Standard output is the first one.  */
 213       for (i = 0; i <= nfiles; i++)
 214         {
 215           if (descriptors[i] != NULL)
 216             fwrite (buffer, bytes_read, 1, descriptors[i]);
 217         }
 218     }
 219
 220   if (bytes_read == -1)
 221     {
 222       error (0, errno, _("read error"));
 223       ret = 1;
 224     }
 225
 226   /* Close the files, but not standard output.  */
 227   for (i = 1; i <= nfiles; i++)
 228     if (descriptors[i] != NULL
 229         && (ferror (descriptors[i]) || fclose (descriptors[i]) == EOF))
 230       {
 231         error (0, errno, "%s", files[i]);
 232         ret = 1;
 233       }
 234
 235   free (descriptors);
 236
 237   return ret;
 238 }