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