src/tee.c

   1 /* tee - read from standard input and write to standard output and files.
   2    Copyright (C) 1985, 1990, 1991 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
  16    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  17
  18 /* Mike Parker, Richard M. Stallman, and David MacKenzie */
  19
  20 #ifdef HAVE_CONFIG_H
  21 #if defined (CONFIG_BROKETS)
  22 /* We use <config.h> instead of "config.h" so that a compilation
  23    using -I. -I$srcdir will use ./config.h rather than $srcdir/config.h
  24    (which it would do because it found this file in $srcdir).  */
  25 #include <config.h>
  26 #else
  27 #include "config.h"
  28 #endif
  29 #endif
  30
  31 #include <stdio.h>
  32 #include <sys/types.h>
  33 #include <signal.h>
  34 #include <getopt.h>
  35
  36 #include "system.h"
  37 #include "version.h"
  38
  39 char *xmalloc ();
  40 void error ();
  41 void xwrite ();
  42
  43 static int tee ();
  44
  45 /* If nonzero, append to output files rather than truncating them. */
  46 static int append;
  47
  48 /* If nonzero, ignore interrupts. */
  49 static int ignore_interrupts;
  50
  51 /* The name that this program was run with. */
  52 char *program_name;
  53
  54 /* If non-zero, display usage information and exit.  */
  55 static int show_help;
  56
  57 /* If non-zero, print the version on standard output and exit.  */
  58 static int show_version;
  59
  60 static struct option const long_options[] =
  61 {
  62   {"append", no_argument, NULL, 'a'},
  63   {"help", no_argument, &show_help, 1},
  64   {"ignore-interrupts", no_argument, NULL, 'i'},
  65   {"version", no_argument, &show_version, 1},
  66   {NULL, 0, NULL, 0}
  67 };
  68
  69 static void
  70 usage ()
  71 {
  72           fprintf (stderr, "\
  73 Usage: %s [{--help,--version}] [-ai] [--append]\n\
  74        [--ignore-interrupts] [file...]\n",
  75                    program_name);
  76   exit (1);
  77 }
  78
  79 void
  80 main (argc, argv)
  81      int argc;
  82      char **argv;
  83 {
  84   int errs;
  85   int optc;
  86
  87   program_name = argv[0];
  88   append = 0;
  89   ignore_interrupts = 0;
  90
  91   while ((optc = getopt_long (argc, argv, "ai", long_options, (int *) 0))
  92          != EOF)
  93     {
  94       switch (optc)
  95         {
  96         case 0:
  97           break;
  98
  99         case 'a':
 100           append = 1;
 101           break;
 102
 103         case 'i':
 104           ignore_interrupts = 1;
 105           break;
 106
 107         default:
 108           usage ();
 109         }
 110     }
 111
 112   if (show_version)
 113     {
 114       printf ("%s\n", version_string);
 115       exit (0);
 116     }
 117
 118   if (show_help)
 119     usage ();
 120
 121   if (ignore_interrupts)
 122     {
 123 #ifdef _POSIX_VERSION
 124       struct sigaction sigact;
 125
 126       sigact.sa_handler = SIG_IGN;
 127       sigemptyset (&sigact.sa_mask);
 128       sigact.sa_flags = 0;
 129       sigaction (SIGINT, &sigact, NULL);
 130 #else                           /* !_POSIX_VERSION */
 131       signal (SIGINT, SIG_IGN);
 132 #endif                          /* _POSIX_VERSION */
 133     }
 134
 135   errs = tee (argc - optind, &argv[optind]);
 136   if (close (0) != 0)
 137     error (1, errno, "standard input");
 138   if (close (1) != 0)
 139     error (1, errno, "standard output");
 140   exit (errs);
 141 }
 142
 143 /* Copy the standard input into each of the NFILES files in FILES
 144    and into the standard output.
 145    Return 0 if successful, 1 if any errors occur. */
 146
 147 static int
 148 tee (nfiles, files)
 149      int nfiles;
 150      char **files;
 151 {
 152   int *descriptors;
 153   char buffer[BUFSIZ];
 154   register int bytes_read, i, ret = 0, mode;
 155
 156   if (nfiles)
 157     descriptors = (int *) xmalloc (nfiles * sizeof (int));
 158   mode = O_WRONLY | O_CREAT;
 159   if (append)
 160     mode |= O_APPEND;
 161   else
 162     mode |= O_TRUNC;
 163
 164   for (i = 0; i < nfiles; i++)
 165     {
 166       descriptors[i] = open (files[i], mode, 0666);
 167       if (descriptors[i] == -1)
 168         {
 169           error (0, errno, "%s", files[i]);
 170           ret = 1;
 171         }
 172     }
 173
 174   while ((bytes_read = read (0, buffer, sizeof buffer)) > 0)
 175     {
 176       xwrite (1, buffer, bytes_read);
 177       for (i = 0; i < nfiles; i++)
 178         if (descriptors[i] != -1)
 179           xwrite (descriptors[i], buffer, bytes_read);
 180     }
 181   if (bytes_read == -1)
 182     {
 183       error (0, errno, "read error");
 184       ret = 1;
 185     }
 186
 187   for (i = 0; i < nfiles; i++)
 188     if (descriptors[i] != -1 && close (descriptors[i]) != 0)
 189       {
 190         error (0, errno, "%s", files[i]);
 191         ret = 1;
 192       }
 193
 194   if (nfiles)
 195     free (descriptors);
 196
 197   return ret;
 198 }