util/grub-mkrelpath.c

   1 /* grub-mkrelpath.c - make a system path relative to its root */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2009,2010 Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/util/misc.h>
  21 #include <grub/i18n.h>
  22 #include <getopt.h>
  23
  24 #include "progname.h"
  25
  26 static struct option options[] =
  27   {
  28     {"help", no_argument, 0, 'h'},
  29     {"version", no_argument, 0, 'V'},
  30     {0, 0, 0, 0},
  31   };
  32
  33 static void
  34 usage (int status)
  35 {
  36   if (status)
  37     fprintf (stderr, "Try `%s --help' for more information.\n", program_name);
  38   else
  39     printf ("\
  40 Usage: %s [OPTIONS] PATH\n\
  41 \n\
  42 Make a system path relative to it's root.\n\
  43 \n\
  44 Options:\n\
  45   -h, --help                display this message and exit\n\
  46   -V, --version             print version information and exit\n\
  47 \n\
  48 Report bugs to <%s>.\n", program_name, PACKAGE_BUGREPORT);
  49
  50   exit (status);
  51 }
  52
  53 int
  54 main (int argc, char *argv[])
  55 {
  56   char *argument, *relpath;
  57
  58   set_program_name (argv[0]);
  59
  60   grub_util_init_nls ();
  61
  62   /* Check for options.  */
  63   while (1)
  64     {
  65       int c = getopt_long (argc, argv, "hV", options, 0);
  66
  67       if (c == -1)
  68         break;
  69       else
  70         switch (c)
  71           {
  72           case 'h':
  73             usage (0);
  74             break;
  75
  76           case 'V':
  77             printf ("%s (%s) %s\n", program_name, PACKAGE_NAME, PACKAGE_VERSION);
  78             return 0;
  79
  80           default:
  81             usage (1);
  82             break;
  83           }
  84     }
  85
  86   if (optind >= argc)
  87     {
  88       fprintf (stderr, "No path is specified.\n");
  89       usage (1);
  90     }
  91
  92   if (optind + 1 != argc)
  93     {
  94       fprintf (stderr, "Unknown extra argument `%s'.\n", argv[optind + 1]);
  95       usage (1);
  96     }
  97
  98   argument = argv[optind];
  99
 100   relpath = make_system_path_relative_to_its_root (argument);
 101   printf ("%s\n", relpath);
 102   free (relpath);
 103
 104   return 0;
 105 }