arch/all-pc/boot/grub2-aros/grub-core/commands/cmp.c

   1 /* cmd.c - command to cmp an operating system */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2003,2005,2006,2007,2009  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 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB 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, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/dl.h>
  21 #include <grub/misc.h>
  22 #include <grub/file.h>
  23 #include <grub/mm.h>
  24 #include <grub/command.h>
  25 #include <grub/i18n.h>
  26
  27 GRUB_MOD_LICENSE ("GPLv3+");
  28
  29 #define BUFFER_SIZE 512
  30
  31 static grub_err_t
  32 grub_cmd_cmp (grub_command_t cmd __attribute__ ((unused)),
  33               int argc, char **args)
  34 {
  35   grub_ssize_t rd1, rd2;
  36   grub_off_t pos;
  37   grub_file_t file1 = 0;
  38   grub_file_t file2 = 0;
  39   char *buf1 = 0;
  40   char *buf2 = 0;
  41
  42   if (argc != 2)
  43     return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("two arguments expected"));
  44
  45   grub_printf_ (N_("Compare file `%s' with `%s':\n"), args[0],
  46                 args[1]);
  47
  48   file1 = grub_file_open (args[0]);
  49   file2 = grub_file_open (args[1]);
  50   if (! file1 || ! file2)
  51     goto cleanup;
  52
  53   if (grub_file_size (file1) != grub_file_size (file2))
  54     grub_printf_ (N_("Files differ in size: %llu [%s], %llu [%s]\n"),
  55                   (unsigned long long) grub_file_size (file1), args[0],
  56                   (unsigned long long) grub_file_size (file2), args[1]);
  57   else
  58     {
  59       pos = 0;
  60
  61       buf1 = grub_malloc (BUFFER_SIZE);
  62       buf2 = grub_malloc (BUFFER_SIZE);
  63
  64       if (! buf1 || ! buf2)
  65         goto cleanup;
  66
  67       do
  68         {
  69           int i;
  70
  71           rd1 = grub_file_read (file1, buf1, BUFFER_SIZE);
  72           rd2 = grub_file_read (file2, buf2, BUFFER_SIZE);
  73
  74           if (rd1 != rd2)
  75             goto cleanup;
  76
  77           for (i = 0; i < rd2; i++)
  78             {
  79               if (buf1[i] != buf2[i])
  80                 {
  81                   grub_printf_ (N_("Files differ at the offset %llu: 0x%x [%s], 0x%x [%s]\n"),
  82                                 (unsigned long long) (i + pos), buf1[i],
  83                                 args[0], buf2[i], args[1]);
  84                   goto cleanup;
  85                 }
  86             }
  87           pos += BUFFER_SIZE;
  88
  89         }
  90       while (rd2);
  91
  92       /* TRANSLATORS: it's always exactly 2 files.  */
  93       grub_printf_ (N_("The files are identical.\n"));
  94     }
  95
  96 cleanup:
  97
  98   grub_free (buf1);
  99   grub_free (buf2);
 100   if (file1)
 101     grub_file_close (file1);
 102   if (file2)
 103     grub_file_close (file2);
 104
 105   return grub_errno;
 106 }
 107
 108 static grub_command_t cmd;
 109 \f
 110 GRUB_MOD_INIT(cmp)
 111 {
 112   cmd = grub_register_command ("cmp", grub_cmd_cmp,
 113                                N_("FILE1 FILE2"), N_("Compare two files."));
 114 }
 115
 116 GRUB_MOD_FINI(cmp)
 117 {
 118   grub_unregister_command (cmd);
 119 }