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 <config.h>
  21
  22 #include <stdio.h>
  23 #include <grub/util/misc.h>
  24 #include <grub/emu/misc.h>
  25 #include <grub/i18n.h>
  26 #include <getopt.h>
  27
  28 #include "progname.h"
  29
  30 static struct option options[] =
  31   {
  32     {"help", no_argument, 0, 'h'},
  33     {"version", no_argument, 0, 'V'},
  34     {0, 0, 0, 0},
  35   };
  36
  37 static void
  38 usage (int status)
  39 {
  40   if (status)
  41     fprintf (stderr, _("Try `%s --help' for more information.\n"), program_name);
  42   else
  43     printf (_("\
  44 Usage: %s [OPTIONS] PATH\n\
  45 \n\
  46 Make a system path relative to its root.\n\
  47 \n\
  48 Options:\n\
  49   -h, --help                display this message and exit\n\
  50   -V, --version             print version information and exit\n\
  51 \n\
  52 Report bugs to <%s>.\n"), program_name, PACKAGE_BUGREPORT);
  53
  54   exit (status);
  55 }
  56
  57 int
  58 main (int argc, char *argv[])
  59 {
  60   char *argument, *relpath;
  61
  62   set_program_name (argv[0]);
  63
  64   grub_util_init_nls ();
  65
  66   /* Check for options.  */
  67   while (1)
  68     {
  69       int c = getopt_long (argc, argv, "hV", options, 0);
  70
  71       if (c == -1)
  72         break;
  73       else
  74         switch (c)
  75           {
  76           case 'h':
  77             usage (0);
  78             break;
  79
  80           case 'V':
  81             printf ("%s (%s) %s\n", program_name, PACKAGE_NAME, PACKAGE_VERSION);
  82             return 0;
  83
  84           default:
  85             usage (1);
  86             break;
  87           }
  88     }
  89
  90   if (optind >= argc)
  91     {
  92       fprintf (stderr, _("No path is specified.\n"));
  93       usage (1);
  94     }
  95
  96   if (optind + 1 != argc)
  97     {
  98       fprintf (stderr, _("Unknown extra argument `%s'.\n"), argv[optind + 1]);
  99       usage (1);
 100     }
 101
 102   argument = argv[optind];
 103
 104   relpath = grub_make_system_path_relative_to_its_root (argument);
 105   printf ("%s\n", relpath);
 106   free (relpath);
 107
 108   return 0;
 109 }