include/SDL_byteorder.h
author Ryan C. Gordon <icculus@icculus.org>
Thu, 08 Sep 2005 06:49:20 +0000
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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
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2004 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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/* Macros for determining the byte-order of this platform */
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#ifndef _SDL_byteorder_h
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#define _SDL_byteorder_h
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/* The two types of endianness */
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#define SDL_LIL_ENDIAN	1234
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#define SDL_BIG_ENDIAN	4321
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#ifdef __linux__
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# include <endian.h>
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# if BYTE_ORDER == LITTLE_ENDIAN
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#  define SDL_BYTEORDER SDL_LIL_ENDIAN
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# else
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#  define SDL_BYTEORDER SDL_BIG_ENDIAN
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# endif
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#else
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/* Pardon the mess, I'm trying to determine the endianness of this host.
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   I'm doing it by preprocessor defines rather than some sort of configure
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   script so that application code can use this too.  The "right" way would
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   be to dynamically generate this file on install, but that's a lot of work.
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 */
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#if (defined(__i386__) || defined(__i386)) || \
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     defined(__ia64__) || defined(WIN32) || \
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    (defined(__alpha__) || defined(__alpha)) || \
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    (defined(__arm__) || defined(__thumb__)) || \
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    (defined(__sh__) || defined(__sh64__)) || \
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    (defined(__mips__) && defined(__MIPSEL__)) || \
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     defined(__SYMBIAN32__) || \
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     defined(__x86_64__) || \
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     defined(__LITTLE_ENDIAN__)
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#define SDL_BYTEORDER	SDL_LIL_ENDIAN
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#else
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#define SDL_BYTEORDER	SDL_BIG_ENDIAN
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#endif
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#endif /* __linux__ */
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#endif /* _SDL_byteorder_h */