68c864ebb6
* commands/cmp.c (BUFFER_SIZE): New macro. (grub_cmd_cmp): Close the right file at the right time. Compare only data just read. Don't report files of different size as identical. Dynamically allocate buffers. Move variable declarations at the beginning of function.
129 lines
3 KiB
C
129 lines
3 KiB
C
/* cmd.c - command to cmp an operating system */
|
||
/*
|
||
* GRUB -- GRand Unified Bootloader
|
||
* Copyright (C) 2003 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 2 of the License, or
|
||
* (at your option) any later version.
|
||
*
|
||
* This program 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, write to the Free Software
|
||
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
||
*/
|
||
|
||
#include <grub/normal.h>
|
||
#include <grub/dl.h>
|
||
#include <grub/arg.h>
|
||
#include <grub/misc.h>
|
||
#include <grub/file.h>
|
||
#include <grub/mm.h>
|
||
|
||
#define BUFFER_SIZE 512
|
||
|
||
static grub_err_t
|
||
grub_cmd_cmp (struct grub_arg_list *state __attribute__ ((unused)),
|
||
int argc, char **args)
|
||
{
|
||
grub_err_t err;
|
||
grub_ssize_t rd1, rd2;
|
||
grub_uint32_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, "two arguments required");
|
||
|
||
grub_printf ("Compare `%s' and `%s':\n", args[0],
|
||
args[1]);
|
||
|
||
if (! (file1 = grub_file_open (args[0]) ) ||
|
||
! (file2 = grub_file_open (args[1]) ) )
|
||
goto cleanup;
|
||
|
||
if (grub_file_size (file1) != grub_file_size (file2))
|
||
grub_printf ("Differ in size: %d [%s], %d [%s]\n",
|
||
grub_file_size (file1), args[0],
|
||
grub_file_size (file2), args[1]);
|
||
|
||
else
|
||
{
|
||
pos = 0;
|
||
|
||
if (! (buf1 = (char *) grub_malloc (BUFFER_SIZE) ) ||
|
||
! (buf2 = (char *) grub_malloc (BUFFER_SIZE) ) )
|
||
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 ("Differ at the offset %d: 0x%x [%s], 0x%x [%s]\n",
|
||
i + pos, buf1[i], args[0],
|
||
buf2[i], args[1]);
|
||
goto cleanup;
|
||
}
|
||
}
|
||
pos += BUFFER_SIZE;
|
||
|
||
} while (rd2);
|
||
grub_printf ("The files are identical.\n");
|
||
}
|
||
|
||
cleanup:
|
||
err=grub_errno;
|
||
if (buf1)
|
||
grub_free (buf1);
|
||
if (buf2)
|
||
grub_free (buf2);
|
||
if (file1)
|
||
grub_file_close (file1);
|
||
if (file2)
|
||
grub_file_close (file2);
|
||
|
||
return err;
|
||
}
|
||
|
||
|
||
#ifdef GRUB_UTIL
|
||
void
|
||
grub_cmp_init (void)
|
||
{
|
||
grub_register_command ("cmp", grub_cmd_cmp, GRUB_COMMAND_FLAG_BOTH,
|
||
"cmp FILE1 FILE2", "Compare two files", 0);
|
||
}
|
||
|
||
void
|
||
grub_cmp_fini (void)
|
||
{
|
||
grub_unregister_command ("cmp");
|
||
}
|
||
#else /* ! GRUB_UTIL */
|
||
GRUB_MOD_INIT
|
||
{
|
||
(void)mod; /* To stop warning. */
|
||
grub_register_command ("cmp", grub_cmd_cmp, GRUB_COMMAND_FLAG_BOTH,
|
||
"cmp FILE1 FILE2", "Compare two files", 0);
|
||
}
|
||
|
||
GRUB_MOD_FINI
|
||
{
|
||
grub_unregister_command ("cmp");
|
||
}
|
||
#endif /* ! GRUB_UTIL */
|