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, 1996 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 char *xmalloc ();
  30 int full_write ();
  31
  32 static int tee __P ((int nfiles, const char **files));
  33
  34 /* If nonzero, append to output files rather than truncating them. */
  35 static int append;
  36
  37 /* If nonzero, ignore interrupts. */
  38 static int ignore_interrupts;
  39
  40 /* The name that this program was run with. */
  41 char *program_name;
  42
  43 /* If nonzero, display usage information and exit.  */
  44 static int show_help;
  45
  46 /* If nonzero, print the version on standard output and exit.  */
  47 static int show_version;
  48
  49 static struct option const long_options[] =
  50 {
  51   {"append", no_argument, NULL, 'a'},
  52   {"help", no_argument, &show_help, 1},
  53   {"ignore-interrupts", no_argument, NULL, 'i'},
  54   {"version", no_argument, &show_version, 1},
  55   {NULL, 0, NULL, 0}
  56 };
  57
  58 static void
  59 usage (int status)
  60 {
  61   if (status != 0)
  62     fprintf (stderr, _("Try `%s --help' for more information.\n"),
  63              program_name);
  64   else
  65     {
  66       printf (_("Usage: %s [OPTION]... [FILE]...\n"), program_name);
  67       printf (_("\
  68 Copy standard input to each FILE, and also to standard output.\n\
  69 \n\
  70   -a, --append              append to the given FILEs, do not overwrite\n\
  71   -i, --ignore-interrupts   ignore interrupt signals\n\
  72       --help                display this help and exit\n\
  73       --version             output version information and exit\n\
  74 "));
  75       puts (_("\nReport bugs to sh-utils-bugs@gnu.ai.mit.edu"));
  76     }
  77   exit (status);
  78 }
  79
  80 int
  81 main (int argc, char **argv)
  82 {
  83   int errs;
  84   int optc;
  85
  86   program_name = argv[0];
  87   setlocale (LC_ALL, "");
  88   bindtextdomain (PACKAGE, LOCALEDIR);
  89   textdomain (PACKAGE);
  90
  91   append = 0;
  92   ignore_interrupts = 0;
  93
  94   while ((optc = getopt_long (argc, argv, "ai", long_options, (int *) 0))
  95          != EOF)
  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         default:
 111           usage (1);
 112         }
 113     }
 114
 115   if (show_version)
 116     {
 117       printf ("tee (%s) %s\n", GNU_PACKAGE, VERSION);
 118       exit (0);
 119     }
 120
 121   if (show_help)
 122     usage (0);
 123
 124   if (ignore_interrupts)
 125     {
 126 #ifdef _POSIX_SOURCE
 127       struct sigaction sigact;
 128
 129       sigact.sa_handler = SIG_IGN;
 130       sigemptyset (&sigact.sa_mask);
 131       sigact.sa_flags = 0;
 132       sigaction (SIGINT, &sigact, NULL);
 133 #else                           /* !_POSIX_SOURCE */
 134       signal (SIGINT, SIG_IGN);
 135 #endif                          /* _POSIX_SOURCE */
 136     }
 137
 138   /* Don't let us be killed if one of the output files is a pipe that
 139      doesn't consume all its input.  */
 140 #ifdef _POSIX_SOURCE
 141   {
 142     struct sigaction sigact;
 143
 144     sigact.sa_handler = SIG_IGN;
 145     sigemptyset (&sigact.sa_mask);
 146     sigact.sa_flags = 0;
 147     sigaction (SIGPIPE, &sigact, NULL);
 148   }
 149 #else
 150   signal (SIGPIPE, SIG_IGN);
 151 #endif
 152
 153   errs = tee (argc - optind, (const char **) &argv[optind]);
 154   if (close (0) != 0)
 155     error (1, errno, _("standard input"));
 156   if (close (1) != 0)
 157     error (1, errno, _("standard output"));
 158   exit (errs);
 159 }
 160
 161 /* Copy the standard input into each of the NFILES files in FILES
 162    and into the standard output.
 163    Return 0 if successful, 1 if any errors occur. */
 164
 165 static int
 166 tee (int nfiles, const char **files)
 167 {
 168   int *descriptors;
 169   char buffer[BUFSIZ];
 170   register int bytes_read, i, ret = 0, mode;
 171
 172   descriptors = (int *) xmalloc ((nfiles + 1) * sizeof (int));
 173
 174   mode = O_WRONLY | O_CREAT;
 175   if (append)
 176     mode |= O_APPEND;
 177   else
 178     mode |= O_TRUNC;
 179
 180   /* Move all the names `up' one in the argv array to make room for
 181      the entry for standard output.  This writes into argv[argc].  */
 182   for (i = nfiles; i >= 1; i--)
 183     files[i] = files[i - 1];
 184
 185   /* In the array of NFILES + 1 descriptors, make
 186      the first one correspond to standard output.   */
 187   descriptors[0] = 1;
 188   files[0] = _("standard output");
 189
 190   for (i = 1; i <= nfiles; i++)
 191     {
 192       descriptors[i] = open (files[i], mode, 0666);
 193       if (descriptors[i] == -1)
 194         {
 195           error (0, errno, "%s", files[i]);
 196           ret = 1;
 197         }
 198     }
 199
 200   while (1)
 201     {
 202       bytes_read = read (0, buffer, sizeof buffer);
 203 #ifdef EINTR
 204       if (bytes_read < 0 && errno == EINTR)
 205         continue;
 206 #endif
 207       if (bytes_read <= 0)
 208         break;
 209
 210       /* Write to all NFILES + 1 descriptors.
 211          Standard output is the first one.  */
 212       for (i = 0; i <= nfiles; i++)
 213         {
 214           if (descriptors[i] != -1
 215               && full_write (descriptors[i], buffer, bytes_read) < 0)
 216             {
 217               error (0, errno, "%s", files[i]);
 218               /* Don't close stdout.  That's done in main.  */
 219               if (descriptors[i] != 1)
 220                 close (descriptors[i]);
 221               descriptors[i] = -1;
 222               ret = 1;
 223             }
 224         }
 225     }
 226
 227   if (bytes_read == -1)
 228     {
 229       error (0, errno, _("read error"));
 230       ret = 1;
 231     }
 232
 233   /* Close the files, but not standard output.  */
 234   for (i = 1; i <= nfiles; i++)
 235     if (descriptors[i] != -1 && close (descriptors[i]) != 0)
 236       {
 237         error (0, errno, "%s", files[i]);
 238         ret = 1;
 239       }
 240
 241   free (descriptors);
 242
 243   return ret;
 244 }