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89a7d726 | 1 | /* blocklist.c - print the block list of a file */ |
2 | /* | |
3 | * GRUB -- GRand Unified Bootloader | |
4 | * Copyright (C) 2006 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 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program 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, write to the Free Software | |
18 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
19 | */ | |
20 | ||
21 | #include <grub/normal.h> | |
22 | #include <grub/dl.h> | |
23 | #include <grub/arg.h> | |
24 | #include <grub/misc.h> | |
25 | #include <grub/file.h> | |
26 | #include <grub/mm.h> | |
27 | #include <grub/disk.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 | auto void read_blocklist (unsigned long sector, unsigned offset, | |
39 | unsigned length); | |
40 | auto void print_blocklist (unsigned long sector, unsigned num, | |
41 | unsigned offset, unsigned length); | |
42 | ||
43 | void read_blocklist (unsigned long sector, unsigned offset, | |
44 | unsigned length) | |
45 | { | |
46 | if (num_sectors > 0) | |
47 | { | |
48 | if (start_sector + num_sectors == sector | |
49 | && offset == 0 && length == GRUB_DISK_SECTOR_SIZE) | |
50 | { | |
51 | num_sectors++; | |
52 | return; | |
53 | } | |
54 | ||
55 | print_blocklist (start_sector, num_sectors, 0, 0); | |
56 | num_sectors = 0; | |
57 | } | |
58 | ||
59 | if (offset == 0 && length == GRUB_DISK_SECTOR_SIZE) | |
60 | { | |
61 | start_sector = sector; | |
62 | num_sectors++; | |
63 | } | |
64 | else | |
65 | print_blocklist (sector, 0, offset, length); | |
66 | } | |
67 | ||
68 | void print_blocklist (unsigned long sector, unsigned num, | |
69 | unsigned offset, unsigned length) | |
70 | { | |
71 | if (num_entries++) | |
72 | grub_printf (","); | |
73 | ||
74 | grub_printf ("%lu", sector); | |
75 | if (num > 0) | |
76 | grub_printf ("+%u", num); | |
77 | if (offset != 0 || length != 0) | |
78 | grub_printf ("[%u-%u]", offset, offset + length); | |
79 | } | |
80 | ||
81 | if (argc < 1) | |
82 | return grub_error (GRUB_ERR_BAD_ARGUMENT, "no file specified"); | |
83 | ||
84 | file = grub_file_open (args[0]); | |
85 | if (! file) | |
86 | return grub_errno; | |
87 | ||
88 | file->read_hook = read_blocklist; | |
89 | ||
90 | while (grub_file_read (file, buf, sizeof (buf)) > 0) | |
91 | ; | |
92 | ||
93 | if (num_sectors > 0) | |
94 | print_blocklist (start_sector, num_sectors, 0, 0); | |
95 | ||
96 | grub_file_close (file); | |
97 | ||
98 | return grub_errno; | |
99 | } | |
100 | ||
101 | \f | |
102 | GRUB_MOD_INIT(blocklist) | |
103 | { | |
104 | (void) mod; /* To stop warning. */ | |
105 | grub_register_command ("blocklist", grub_cmd_blocklist, | |
106 | GRUB_COMMAND_FLAG_BOTH, | |
107 | "blocklist FILE", | |
108 | "Print a block list.", 0); | |
109 | } | |
110 | ||
111 | GRUB_MOD_FINI(blocklist) | |
112 | { | |
113 | grub_unregister_command ("blocklist"); | |
114 | } |