120 lines
2.8 KiB
C
120 lines
2.8 KiB
C
/* cmd.c - command to cmp an operating system */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2003,2005,2006,2007,2009 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/gzio.h>
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#include <grub/command.h>
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#include <grub/i18n.h>
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#define BUFFER_SIZE 512
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static grub_err_t
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grub_cmd_cmp (grub_command_t cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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grub_ssize_t rd1, rd2;
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grub_off_t pos;
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grub_file_t file1 = 0;
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grub_file_t file2 = 0;
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char *buf1 = 0;
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char *buf2 = 0;
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if (argc != 2)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "two arguments required");
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grub_printf ("Compare file `%s' with `%s':\n", args[0],
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args[1]);
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file1 = grub_gzfile_open (args[0], 1);
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file2 = grub_gzfile_open (args[1], 1);
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if (! file1 || ! file2)
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goto cleanup;
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if (grub_file_size (file1) != grub_file_size (file2))
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grub_printf ("Files differ in size: %llu [%s], %llu [%s]\n",
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(unsigned long long) grub_file_size (file1), args[0],
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(unsigned long long) grub_file_size (file2), args[1]);
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else
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{
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pos = 0;
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buf1 = grub_malloc (BUFFER_SIZE);
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buf2 = grub_malloc (BUFFER_SIZE);
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if (! buf1 || ! buf2)
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goto cleanup;
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do
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{
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int i;
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rd1 = grub_file_read (file1, buf1, BUFFER_SIZE);
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rd2 = grub_file_read (file2, buf2, BUFFER_SIZE);
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if (rd1 != rd2)
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goto cleanup;
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for (i = 0; i < rd2; i++)
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{
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if (buf1[i] != buf2[i])
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{
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grub_printf ("Files differ at the offset %llu: 0x%x [%s], 0x%x [%s]\n",
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(unsigned long long) (i + pos), buf1[i], args[0],
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buf2[i], args[1]);
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goto cleanup;
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}
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}
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pos += BUFFER_SIZE;
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}
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while (rd2);
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grub_printf ("The files are identical.\n");
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}
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cleanup:
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if (buf1)
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grub_free (buf1);
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if (buf2)
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grub_free (buf2);
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if (file1)
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grub_file_close (file1);
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if (file2)
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grub_file_close (file2);
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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(cmp)
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{
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cmd = grub_register_command ("cmp", grub_cmd_cmp,
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N_("FILE1 FILE2"), N_("Compare two files."));
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}
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GRUB_MOD_FINI(cmp)
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{
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grub_unregister_command (cmd);
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}
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