string/endian.h

   1 /* Copyright (C) 1992, 1996, 1997, 2000 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #ifndef _ENDIAN_H
  20 #define _ENDIAN_H       1
  21
  22 #include <features.h>
  23
  24 /* Definitions for byte order, according to significance of bytes,
  25    from low addresses to high addresses.  The value is what you get by
  26    putting '4' in the most significant byte, '3' in the second most
  27    significant byte, '2' in the second least significant byte, and '1'
  28    in the least significant byte, and then writing down one digit for
  29    each byte, starting with the byte at the lowest address at the left,
  30    and proceeding to the byte with the highest address at the right.  */
  31
  32 #define __LITTLE_ENDIAN 1234
  33 #define __BIG_ENDIAN    4321
  34 #define __PDP_ENDIAN    3412
  35
  36 /* This file defines `__BYTE_ORDER' for the particular machine.  */
  37 #include <bits/endian.h>
  38
  39 /* Some machines may need to use a different endianness for floating point
  40    values.  */
  41 #ifndef __FLOAT_WORD_ORDER
  42 # define __FLOAT_WORD_ORDER __BYTE_ORDER
  43 #endif
  44
  45 #ifdef  __USE_BSD
  46 # define LITTLE_ENDIAN  __LITTLE_ENDIAN
  47 # define BIG_ENDIAN     __BIG_ENDIAN
  48 # define PDP_ENDIAN     __PDP_ENDIAN
  49 # define BYTE_ORDER     __BYTE_ORDER
  50 #endif
  51
  52 #if __BYTE_ORDER == __LITTLE_ENDIAN
  53 # define __LONG_LONG_PAIR(HI, LO) LO, HI
  54 #elif __BYTE_ORDER == __BIG_ENDIAN
  55 # define __LONG_LONG_PAIR(HI, LO) HI, LO
  56 #endif
  57
  58 #endif  /* endian.h */