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annotate include/SDL_byteorder.h @ 1339:62802d9d7c87

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author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 10:40:14 +0000
parents c9b51268668f
children 7ba544e2888d
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Macros for determining the byte-order of this platform */
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24
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25 #ifndef _SDL_byteorder_h
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26 #define _SDL_byteorder_h
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27
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28 /* The two types of endianness */
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29 #define SDL_LIL_ENDIAN 1234
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30 #define SDL_BIG_ENDIAN 4321
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31
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32 #ifdef __linux__
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33 # include <endian.h>
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34 # if BYTE_ORDER == LITTLE_ENDIAN
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35 # define SDL_BYTEORDER SDL_LIL_ENDIAN
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36 # else
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37 # define SDL_BYTEORDER SDL_BIG_ENDIAN
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38 # endif
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39
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40 #else
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41
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42 /* Pardon the mess, I'm trying to determine the endianness of this host.
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43 I'm doing it by preprocessor defines rather than some sort of configure
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44 script so that application code can use this too. The "right" way would
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45 be to dynamically generate this file on install, but that's a lot of work.
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46 */
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47 #if (defined(__i386__) || defined(__i386)) || \
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48 defined(__ia64__) || defined(WIN32) || \
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49 (defined(__alpha__) || defined(__alpha)) || \
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50 (defined(__arm__) || defined(__thumb__)) || \
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51 (defined(__sh__) || defined(__sh64__)) || \
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52 (defined(__mips__) && defined(__MIPSEL__)) || \
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53 defined(__SYMBIAN32__) || defined(__x86_64__) || \
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54 defined(__OS2__) || defined(__LITTLE_ENDIAN__)
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55 #define SDL_BYTEORDER SDL_LIL_ENDIAN
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56 #else
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57 #define SDL_BYTEORDER SDL_BIG_ENDIAN
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58 #endif
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59
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60 #endif /* __linux__ */
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61
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62 #endif /* _SDL_byteorder_h */