commands/blocklist.c

   1 /* blocklist.c - print the block list of a file */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2006,2007  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/normal.h>
  21 #include <grub/dl.h>
  22 #include <grub/arg.h>
  23 #include <grub/misc.h>
  24 #include <grub/file.h>
  25 #include <grub/mm.h>
  26 #include <grub/disk.h>
  27 #include <grub/partition.h>
  28
  29 static grub_err_t
  30 grub_cmd_blocklist (struct grub_arg_list *state __attribute__ ((unused)),
  31                     int argc, char **args)
  32 {
  33   grub_file_t file;
  34   char buf[GRUB_DISK_SECTOR_SIZE];
  35   unsigned long start_sector = 0;
  36   unsigned num_sectors = 0;
  37   int num_entries = 0;
  38   grub_disk_addr_t part_start = 0;
  39   auto void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
  40                             unsigned length);
  41   auto void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
  42                              unsigned offset, unsigned length);
  43
  44   void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
  45                        unsigned length)
  46     {
  47       if (num_sectors > 0)
  48         {
  49           if (start_sector + num_sectors == sector
  50               && offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
  51             {
  52               num_sectors++;
  53               return;
  54             }
  55
  56           print_blocklist (start_sector, num_sectors, 0, 0);
  57           num_sectors = 0;
  58         }
  59
  60       if (offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
  61         {
  62           start_sector = sector;
  63           num_sectors++;
  64         }
  65       else
  66         print_blocklist (sector, 0, offset, length);
  67     }
  68
  69   void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
  70                         unsigned offset, unsigned length)
  71     {
  72       if (num_entries++)
  73         grub_printf (",");
  74
  75       grub_printf ("%llu", (unsigned long long) (sector - part_start));
  76       if (num > 0)
  77         grub_printf ("+%u", num);
  78       if (offset != 0 || length != 0)
  79         grub_printf ("[%u-%u]", offset, offset + length);
  80     }
  81
  82   if (argc < 1)
  83     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
  84
  85   file = grub_file_open (args[0]);
  86   if (! file)
  87     return grub_errno;
  88
  89   if (! file->device->disk)
  90     return grub_error (GRUB_ERR_BAD_DEVICE,
  91                        "this command is available only for disk devices.");
  92
  93   if (file->device->disk->partition)
  94     part_start = grub_partition_get_start (file->device->disk->partition);
  95
  96   file->read_hook = read_blocklist;
  97
  98   while (grub_file_read (file, buf, sizeof (buf)) > 0)
  99     ;
 100
 101   if (num_sectors > 0)
 102     print_blocklist (start_sector, num_sectors, 0, 0);
 103
 104   grub_file_close (file);
 105
 106   return grub_errno;
 107 }
 108
 109 \f
 110 GRUB_MOD_INIT(blocklist)
 111 {
 112   (void) mod;                   /* To stop warning. */
 113   grub_register_command ("blocklist", grub_cmd_blocklist,
 114                          GRUB_COMMAND_FLAG_BOTH,
 115                          "blocklist FILE",
 116                          "Print a block list.", 0);
 117 }
 118
 119 GRUB_MOD_FINI(blocklist)
 120 {
 121   grub_unregister_command ("blocklist");
 122 }