include/SDL_byteorder.h
author Ryan C. Gordon <icculus@icculus.org>
Thu, 08 Sep 2005 06:49:20 +0000
changeset 1137 0f9d463bf09c
parent 969 cfb9518670f4
child 1190 173c063d4f55
permissions -rw-r--r--
Byte order detection fixes in SDL_endian.h ... --ryan. From: Mike Frysinger <vapier@gentoo.org> To: sdl@libsdl.org Date: Thu, 1 Sep 2005 20:25:01 -0400 Subject: [SDL] [patch] add support for arm/thumb and superh to endian find attached a patch to add support for detecting endian on superh and arm/thumb ... also, ive incorporated a patch from Fedora which will gather the correct endian on a linux host from the system endian.h instead of just trying to maintain an ever-growing list of architectures -mike

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2004 Sam Lantinga

    This 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.

    This 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 this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/

#ifdef SAVE_RCSID
static char rcsid =
 "@(#) $Id$";
#endif

/* Macros for determining the byte-order of this platform */

#ifndef _SDL_byteorder_h
#define _SDL_byteorder_h

/* The two types of endianness */
#define SDL_LIL_ENDIAN	1234
#define SDL_BIG_ENDIAN	4321

#ifdef __linux__
# include <endian.h>
# if BYTE_ORDER == LITTLE_ENDIAN
#  define SDL_BYTEORDER SDL_LIL_ENDIAN
# else
#  define SDL_BYTEORDER SDL_BIG_ENDIAN
# endif

#else

/* Pardon the mess, I'm trying to determine the endianness of this host.
   I'm doing it by preprocessor defines rather than some sort of configure
   script so that application code can use this too.  The "right" way would
   be to dynamically generate this file on install, but that's a lot of work.
 */
#if (defined(__i386__) || defined(__i386)) || \
     defined(__ia64__) || defined(WIN32) || \
    (defined(__alpha__) || defined(__alpha)) || \
    (defined(__arm__) || defined(__thumb__)) || \
    (defined(__sh__) || defined(__sh64__)) || \
    (defined(__mips__) && defined(__MIPSEL__)) || \
     defined(__SYMBIAN32__) || \
     defined(__x86_64__) || \
     defined(__LITTLE_ENDIAN__)
#define SDL_BYTEORDER	SDL_LIL_ENDIAN
#else
#define SDL_BYTEORDER	SDL_BIG_ENDIAN
#endif

#endif /* __linux__ */

#endif /* _SDL_byteorder_h */