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/* cmd.c - command to cmp an operating system */
/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2003,2005,2006,2007,2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/dl.h>
#include <grub/misc.h>
#include <grub/file.h>
#include <grub/mm.h>
#include <grub/command.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
#define BUFFER_SIZE 512
static grub_err_t
grub_cmd_cmp (grub_command_t cmd __attribute__ ((unused)),
int argc, char **args)
{
grub_ssize_t rd1, rd2;
grub_off_t pos;
grub_file_t file1 = 0;
grub_file_t file2 = 0;
char *buf1 = 0;
char *buf2 = 0;
if (argc != 2)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
grub_printf_ (N_("Compare file `%s' with `%s':\n"), args[0],
args[1]);
file1 = grub_file_open (args[0], GRUB_FILE_TYPE_CMP);
file2 = grub_file_open (args[1], GRUB_FILE_TYPE_CMP);
if (! file1 || ! file2)
goto cleanup;
if (grub_file_size (file1) != grub_file_size (file2))
grub_printf_ (N_("Files differ in size: %llu [%s], %llu [%s]\n"),
(unsigned long long) grub_file_size (file1), args[0],
(unsigned long long) grub_file_size (file2), args[1]);
else
{
pos = 0;
buf1 = grub_malloc (BUFFER_SIZE);
buf2 = grub_malloc (BUFFER_SIZE);
if (! buf1 || ! buf2)
goto cleanup;
do
{
int i;
rd1 = grub_file_read (file1, buf1, BUFFER_SIZE);
rd2 = grub_file_read (file2, buf2, BUFFER_SIZE);
if (rd1 != rd2)
goto cleanup;
for (i = 0; i < rd2; i++)
{
if (buf1[i] != buf2[i])
{
grub_printf_ (N_("Files differ at the offset %llu: 0x%x [%s], 0x%x [%s]\n"),
(unsigned long long) (i + pos), buf1[i],
args[0], buf2[i], args[1]);
goto cleanup;
}
}
pos += BUFFER_SIZE;
}
while (rd2);
/* TRANSLATORS: it's always exactly 2 files. */
grub_printf_ (N_("The files are identical.\n"));
}
cleanup:
grub_free (buf1);
grub_free (buf2);
if (file1)
grub_file_close (file1);
if (file2)
grub_file_close (file2);
return grub_errno;
}
static grub_command_t cmd;
GRUB_MOD_INIT(cmp)
{
cmd = grub_register_command ("cmp", grub_cmd_cmp,
N_("FILE1 FILE2"), N_("Compare two files."));
}
GRUB_MOD_FINI(cmp)
{
grub_unregister_command (cmd);
}
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