SDL/SDL_byteorder.h

   1 /*
   2     SDL - Simple DirectMedia Layer
   3     Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  Sam Lantinga
   4
   5     This library is free software; you can redistribute it and/or
   6     modify it under the terms of the GNU Library General Public
   7     License as published by the Free Software Foundation; either
   8     version 2 of the License, or (at your option) any later version.
   9
  10     This 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 this library; if not, write to the Free
  17     Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  18
  19     Sam Lantinga
  20     slouken@libsdl.org
  21 */
  22
  23 #ifdef SAVE_RCSID
  24 static char rcsid =
  25  "@(#) $Id$";
  26 #endif
  27
  28 /* Macros for determining the byte-order of this platform */
  29
  30 #ifndef _SDL_byteorder_h
  31 #define _SDL_byteorder_h
  32
  33 /* The two types of endianness */
  34 #define SDL_LIL_ENDIAN  1234
  35 #define SDL_BIG_ENDIAN  4321
  36
  37 /* Pardon the mess, I'm trying to determine the endianness of this host.
  38    I'm doing it by preprocessor defines rather than some sort of configure
  39    script so that application code can use this too.  The "right" way would
  40    be to dynamically generate this file on install, but that's a lot of work.
  41  */
  42 #if  defined(__i386__) || defined(__ia64__) || defined(WIN32) || \
  43     (defined(__alpha__) || defined(__alpha)) || \
  44      defined(__arm__) || \
  45     (defined(__mips__) && defined(__MIPSEL__)) || \
  46      defined(__SYMBIAN32__) || \
  47      defined(__LITTLE_ENDIAN__)
  48 #define SDL_BYTEORDER   SDL_LIL_ENDIAN
  49 #else
  50 #define SDL_BYTEORDER   SDL_BIG_ENDIAN
  51 #endif
  52
  53 #endif /* _SDL_byteorder_h */