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
     1 /*
     2     SDL - Simple DirectMedia Layer
     3     Copyright (C) 1997-2004 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 #ifdef __linux__
    38 # include <endian.h>
    39 # if BYTE_ORDER == LITTLE_ENDIAN
    40 #  define SDL_BYTEORDER SDL_LIL_ENDIAN
    41 # else
    42 #  define SDL_BYTEORDER SDL_BIG_ENDIAN
    43 # endif
    44 
    45 #else
    46 
    47 /* Pardon the mess, I'm trying to determine the endianness of this host.
    48    I'm doing it by preprocessor defines rather than some sort of configure
    49    script so that application code can use this too.  The "right" way would
    50    be to dynamically generate this file on install, but that's a lot of work.
    51  */
    52 #if (defined(__i386__) || defined(__i386)) || \
    53      defined(__ia64__) || defined(WIN32) || \
    54     (defined(__alpha__) || defined(__alpha)) || \
    55     (defined(__arm__) || defined(__thumb__)) || \
    56     (defined(__sh__) || defined(__sh64__)) || \
    57     (defined(__mips__) && defined(__MIPSEL__)) || \
    58      defined(__SYMBIAN32__) || \
    59      defined(__x86_64__) || \
    60      defined(__LITTLE_ENDIAN__)
    61 #define SDL_BYTEORDER	SDL_LIL_ENDIAN
    62 #else
    63 #define SDL_BYTEORDER	SDL_BIG_ENDIAN
    64 #endif
    65 
    66 #endif /* __linux__ */
    67 
    68 #endif /* _SDL_byteorder_h */