125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/* cmd.c - command to cmp an operating system */
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/*
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* PUPA -- Preliminary Universal Programming Architecture for GRUB
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* Copyright (C) 2003 Free Software Foundation, Inc.
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*
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* PUPA 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 PUPA; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <pupa/normal.h>
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#include <pupa/dl.h>
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#include <pupa/arg.h>
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#include <pupa/misc.h>
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#include <pupa/file.h>
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static pupa_err_t
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pupa_cmd_cmp (struct pupa_arg_list *state __attribute__ ((unused)),
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int argc, char **args)
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{
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pupa_file_t file1;
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pupa_file_t file2;
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if (argc != 2)
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return pupa_error (PUPA_ERR_BAD_ARGUMENT, "two arguments required");
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pupa_printf ("Compare `%s' and `%s':\n", args[0],
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args[1]);
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file1 = pupa_file_open (args[0]);
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if (! file1)
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return pupa_errno;
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file2 = pupa_file_open (args[1]);
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if (! file2)
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{
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pupa_file_close (file2);
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return pupa_errno;
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}
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if (pupa_file_size (file1) != pupa_file_size (file2))
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pupa_printf ("Differ in size: %d [%s], %d [%s]\n",
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pupa_file_size (file1), args[0],
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pupa_file_size (file2), args[1]);
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else
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{
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char buf1[512];
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char buf2[512];
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pupa_ssize_t rd1, rd2;
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pupa_uint32_t pos = 0;
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do
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{
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int i;
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rd1 = pupa_file_read (file1, buf1, 512);
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rd2 = pupa_file_read (file2, buf2, 512);
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if (rd1 != rd2)
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return 0;
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for (i = 0; i < 512; i++)
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{
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if (buf1[i] != buf2[i])
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{
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pupa_printf ("Differ at the offset %d: 0x%x [%s], 0x%x [%s]\n",
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i + pos, buf1[i], args[0],
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buf2[i], args[1]);
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pupa_file_close (file1);
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pupa_file_close (file2);
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return 0;
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}
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}
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pos += 512;
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} while (rd2);
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}
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pupa_file_close (file1);
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pupa_file_close (file2);
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pupa_printf ("The files are identical.\n");
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return 0;
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}
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#ifdef PUPA_UTIL
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void
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pupa_cmp_init (void)
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{
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pupa_register_command ("cmp", pupa_cmd_cmp, PUPA_COMMAND_FLAG_BOTH,
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"cmp FILE1 FILE2", "Compare two files", 0);
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}
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void
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pupa_cmp_fini (void)
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{
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pupa_unregister_command ("cmp");
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}
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#else /* ! PUPA_UTIL */
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PUPA_MOD_INIT
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{
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(void)mod; /* To stop warning. */
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pupa_register_command ("cmp", pupa_cmd_cmp, PUPA_COMMAND_FLAG_BOTH,
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"cmp FILE1 FILE2", "Compare two files", 0);
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}
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PUPA_MOD_FINI
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{
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pupa_unregister_command ("cmp");
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}
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#endif /* ! PUPA_UTIL */
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