sysdeps/generic/det_endian.c


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/* Determine the "endianness" of the CPU.
   Copyright (C) 1991, 1992, 1997 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Torbjorn Granlund (tege@sics.se).

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdio.h>

main ()
{
  unsigned long int i;

  if (sizeof (i) != 4)
    puts ("#error \"Not a 32-bit machine!\"");

  i = (((((('4' << 8) + '3') << 8) + '2') << 8) + '1');

  printf ("#define __BYTE_ORDER %.4s\n", (char *) &i);

  exit (0);
}