src/tee.c

   1 /* tee - read from standard input and write to standard output and files.
   2    Copyright (C) 85,1990-1999 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   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         case_GETOPT_HELP_CHAR;
 109
 110         case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
 111
 112         default:
 113           usage (1);
 114         }
 115     }
 116
 117   if (ignore_interrupts)
 118     {
 119 #ifdef _POSIX_SOURCE
 120       struct sigaction sigact;
 121
 122       sigact.sa_handler = SIG_IGN;
 123       sigemptyset (&sigact.sa_mask);
 124       sigact.sa_flags = 0;
 125       sigaction (SIGINT, &sigact, NULL);
 126 #else                           /* !_POSIX_SOURCE */
 127       signal (SIGINT, SIG_IGN);
 128 #endif                          /* _POSIX_SOURCE */
 129     }
 130
 131   /* Don't let us be killed if one of the output files is a pipe that
 132      doesn't consume all its input.  */
 133 #ifdef _POSIX_SOURCE
 134   {
 135     struct sigaction sigact;
 136
 137     sigact.sa_handler = SIG_IGN;
 138     sigemptyset (&sigact.sa_mask);
 139     sigact.sa_flags = 0;
 140     sigaction (SIGPIPE, &sigact, NULL);
 141   }
 142 #else
 143   signal (SIGPIPE, SIG_IGN);
 144 #endif
 145
 146   /* FIXME: warn if tee is given no file arguments.
 147      In that case it's just a slow imitation of `cat.'  */
 148
 149   errs = tee (argc - optind, (const char **) &argv[optind]);
 150   if (close (0) != 0)
 151     error (1, errno, _("standard input"));
 152
 153   close_stdout ();
 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   /* In the array of NFILES + 1 descriptors, make
 179      the first one correspond to standard output.   */
 180   descriptors[0] = stdout;
 181   files[0] = _("standard output");
 182   SETVBUF (stdout, NULL, _IONBF, 0);
 183
 184   for (i = 1; i <= nfiles; i++)
 185     {
 186       descriptors[i] = fopen (files[i], mode_string);
 187       if (descriptors[i] == NULL)
 188         {
 189           error (0, errno, "%s", files[i]);
 190           ret = 1;
 191         }
 192       else
 193         {
 194           SETVBUF (descriptors[i], NULL, _IONBF, 0);
 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] != NULL)
 213             fwrite (buffer, bytes_read, 1, descriptors[i]);
 214         }
 215     }
 216
 217   if (bytes_read == -1)
 218     {
 219       error (0, errno, _("read error"));
 220       ret = 1;
 221     }
 222
 223   /* Close the files, but not standard output.  */
 224   for (i = 1; i <= nfiles; i++)
 225     if (descriptors[i] != NULL
 226         && (ferror (descriptors[i]) || fclose (descriptors[i]) == EOF))
 227       {
 228         error (0, errno, "%s", files[i]);
 229         ret = 1;
 230       }
 231
 232   free (descriptors);
 233
 234   return ret;
 235 }