sysdeps/generic/det_endian.c

   1 /* Determine the "endianness" of the CPU.
   2    Copyright (C) 1991, 1992 Free Software Foundation, Inc.
   3    Contributed by Torbjorn Granlund (tege@sics.se).
   4
   5 The GNU C Library is free software; you can redistribute it and/or
   6 modify it under the terms of the GNU Library General Public License as
   7 published by the Free Software Foundation; either version 2 of the
   8 License, or (at your option) any later version.
   9
  10 The GNU C Library is distributed in the hope that it will be useful,
  11 but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13 Library General Public License for more details.
  14
  15 You should have received a copy of the GNU Library General Public
  16 License along with the GNU C Library; see the file COPYING.LIB.  If
  17 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  18 Cambridge, MA 02139, USA.  */
  19
  20 #include <stdio.h>
  21
  22 main ()
  23 {
  24   unsigned long int i;
  25
  26   if (sizeof (i) != 4)
  27     puts ("#error \"Not a 32-bit machine!\"");
  28
  29   i = (((((('4' << 8) + '3') << 8) + '2') << 8) + '1');
  30
  31   printf ("#define __BYTE_ORDER %.4s\n", (char *) &i);
  32
  33   exit (0);
  34 }