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120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* blocklist.c - print the block list of a file */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2006,2007 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/misc.h>
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#include <grub/file.h>
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#include <grub/mm.h>
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#include <grub/disk.h>
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#include <grub/partition.h>
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#include <grub/command.h>
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static grub_err_t
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grub_cmd_blocklist (grub_command_t cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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grub_file_t file;
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char buf[GRUB_DISK_SECTOR_SIZE];
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unsigned long start_sector = 0;
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unsigned num_sectors = 0;
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int num_entries = 0;
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grub_disk_addr_t part_start = 0;
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auto void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
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unsigned length);
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auto void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
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unsigned offset, unsigned length);
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void NESTED_FUNC_ATTR read_blocklist (grub_disk_addr_t sector, unsigned offset,
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unsigned length)
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{
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if (num_sectors > 0)
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{
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if (start_sector + num_sectors == sector
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&& offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
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{
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num_sectors++;
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return;
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}
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print_blocklist (start_sector, num_sectors, 0, 0);
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num_sectors = 0;
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}
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if (offset == 0 && length == GRUB_DISK_SECTOR_SIZE)
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{
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start_sector = sector;
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num_sectors++;
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}
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else
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print_blocklist (sector, 0, offset, length);
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}
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void NESTED_FUNC_ATTR print_blocklist (grub_disk_addr_t sector, unsigned num,
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unsigned offset, unsigned length)
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{
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if (num_entries++)
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grub_printf (",");
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grub_printf ("%llu", (unsigned long long) (sector - part_start));
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if (num > 0)
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grub_printf ("+%u", num);
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if (offset != 0 || length != 0)
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grub_printf ("[%u-%u]", offset, offset + length);
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}
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if (argc < 1)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified");
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file = grub_file_open (args[0]);
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if (! file)
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return grub_errno;
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if (! file->device->disk)
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return grub_error (GRUB_ERR_BAD_DEVICE,
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"this command is available only for disk devices.");
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if (file->device->disk->partition)
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part_start = grub_partition_get_start (file->device->disk->partition);
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file->read_hook = read_blocklist;
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while (grub_file_read (file, buf, sizeof (buf)) > 0)
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;
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if (num_sectors > 0)
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print_blocklist (start_sector, num_sectors, 0, 0);
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grub_file_close (file);
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return grub_errno;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(blocklist)
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{
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cmd = grub_register_command ("blocklist", grub_cmd_blocklist,
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"blocklist FILE", "Print a block list.");
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}
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GRUB_MOD_FINI(blocklist)
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{
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grub_unregister_command (cmd);
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}
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