derek.holloway
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95 lines
2.0 KiB
C
95 lines
2.0 KiB
C
#ifndef ENDIANNESS_H
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#define ENDIANNESS_H
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/*
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* Known limitations:
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* Middle endian systems are not handled currently.
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*/
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#if defined(__SVR4) && defined(__sun)
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#include <sys/byteorder.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif /* _BYTE_ORDER */
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#endif /* Solaris */
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/* .. */
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#if defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonflyBSD__) || defined(__minix)
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#include <sys/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif /* _BYTE_ORDER */
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#endif /* *BSD */
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/* .. */
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#if defined(__OpenBSD__)
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#include <machine/endian.h>
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#if _BYTE_ORDER == _BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif _BYTE_ORDER == _LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif /* _BYTE_ORDER */
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#endif /* OpenBSD */
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/* .. */
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/* Mac OSX has __BIG_ENDIAN__ or __LITTLE_ENDIAN__ automatically set by the compiler (at least with GCC) */
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#if defined(__APPLE__) && defined(__MACH__) || defined(__ellcc__ )
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#ifdef __BIG_ENDIAN__
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#if __BIG_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#endif
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#endif /* __BIG_ENDIAN__ */
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#ifdef __LITTLE_ENDIAN__
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#if __LITTLE_ENDIAN__
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif
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#endif /* __LITTLE_ENDIAN__ */
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#endif /* Mac OSX */
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/* .. */
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#if defined(__linux__)
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#include <endian.h>
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#if __BYTE_ORDER == __BIG_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 0
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#define _YUGA_BIG_ENDIAN 1
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#elif __BYTE_ORDER == __LITTLE_ENDIAN
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#define _YUGA_LITTLE_ENDIAN 1
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#define _YUGA_BIG_ENDIAN 0
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#endif /* __BYTE_ORDER */
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#endif /* GNU/Linux */
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/* . */
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#if !defined(_YUGA_LITTLE_ENDIAN) || !defined(_YUGA_BIG_ENDIAN)
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#error Unable to determine endian
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#endif /* Check we found an endianness correctly. */
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#endif /* ENDIANNESS_H */
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