123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117 |
- /* 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/gzio.h>
- #include <grub/command.h>
- #include <grub/i18n.h>
- #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, "two arguments required");
- file1 = grub_gzfile_open (args[0], 1);
- file2 = grub_gzfile_open (args[1], 1);
- if (! file1 || ! file2)
- goto cleanup;
- if (grub_file_size (file1) != grub_file_size (file2))
- grub_error (GRUB_ERR_BAD_ARGUMENT,
- "Files differ in size: %llu [%s], %llu [%s]",
- (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_error (GRUB_ERR_BAD_ARGUMENT,
- "Files differ at the offset %llu: 0x%x [%s], 0x%x [%s]",
- (unsigned long long) (i + pos), buf1[i], args[0],
- buf2[i], args[1]);
- goto cleanup;
- }
- }
- pos += BUFFER_SIZE;
- }
- while (rd2);
- }
- cleanup:
- if (buf1)
- grub_free (buf1);
- if (buf2)
- 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);
- }
|