mirror of
git://jb55.com/damus
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119 lines
3.6 KiB
C
119 lines
3.6 KiB
C
/*
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* Uses various known flags to decide endianness and defines:
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*
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* __LITTLE_ENDIAN__ or __BIG_ENDIAN__ if not already defined
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*
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* and also defines
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*
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* __BYTE_ORDER__ to either __ORDER_LITTLE_ENDIAN__ or
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* __ORDER_BIG_ENDIAN__ if not already defined
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*
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* If none of these could be set, __UNKNOWN_ENDIAN__ is defined,
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* which is not a known flag. If __BYTE_ORDER__ is defined but
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* not big or little endian, __UNKNOWN_ENDIAN__ is also defined.
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*
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* Note: Some systems define __BYTE_ORDER without __ at the end
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* - this will be mapped to to __BYTE_ORDER__.
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*/
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#ifndef PENDIAN_DETECT
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#define PENDIAN_DETECT
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef __ORDER_LITTLE_ENDIAN__
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#define __ORDER_LITTLE_ENDIAN__ 1234
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#endif
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#ifndef __ORDER_BIG_ENDIAN__
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#define __ORDER_BIG_ENDIAN__ 4321
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#endif
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#ifdef __BYTE_ORDER__
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#if defined(__LITTLE_ENDIAN__) && __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
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#error __LITTLE_ENDIAN__ inconsistent with __BYTE_ORDER__
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#endif
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#if defined(__BIG_ENDIAN__) && __BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
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#error __BIG_ENDIAN__ inconsistent with __BYTE_ORDER__
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#endif
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#else /* __BYTE_ORDER__ */
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#if \
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defined(__LITTLE_ENDIAN__) || \
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(defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_LITTLE_ENDIAN) || \
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defined(__ARMEL__) || defined(__THUMBEL__) || \
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defined(__AARCH64EL__) || \
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(defined(_MSC_VER) && defined(_M_ARM)) || \
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defined(_MIPSEL) || defined(__MIPSEL) || defined(__MIPSEL__) || \
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defined(_M_X64) || defined(_M_IX86) || defined(_M_I86) || \
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defined(__i386__) || defined(__alpha__) || \
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defined(__ia64) || defined(__ia64__) || \
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defined(_M_IA64) || defined(_M_ALPHA) || \
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defined(__amd64) || defined(__amd64__) || defined(_M_AMD64) || \
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defined(__x86_64) || defined(__x86_64__) || defined(_M_X64) || \
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defined(__bfin__)
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#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
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#endif
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#if \
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defined (__BIG_ENDIAN__) || \
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(defined(__BYTE_ORDER) && __BYTE_ORDER == __ORDER_BIG_ENDIAN) || \
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defined(__ARMEB__) || defined(THUMBEB__) || defined (__AARCH64EB__) || \
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defined(_MIPSEB) || defined(__MIPSEB) || defined(__MIPSEB__) || \
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defined(__sparc) || defined(__sparc__) || \
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defined(_POWER) || defined(__powerpc__) || defined(__ppc__) || \
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defined(__hpux) || defined(__hppa) || defined(__s390__)
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#define __BYTE_ORDER__ __ORDER_BIG_ENDIAN__
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#endif
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#endif /* __BYTE_ORDER__ */
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#ifdef __BYTE_ORDER__
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#ifndef __LITTLE_ENDIAN__
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#define __LITTLE_ENDIAN__ 1
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#endif
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#ifndef __BIG_ENDIAN__
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#define __BIG_ENDIAN__ 1
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#endif
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#else
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/*
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* Custom extension - we only define __BYTE_ORDER__ if known big or little.
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* User code that understands __BYTE_ORDER__ may also assume unkown if
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* it is not defined by now - this will allow other endian formats than
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* big or little when supported by compiler.
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*/
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#ifndef __UNKNOWN_ENDIAN__
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#define __UNKNOWN_ENDIAN__ 1
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#endif
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#endif
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#endif /* __BYTE_ORDER__ */
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#if defined(__LITTLE_ENDIAN__) && defined(__BIG_ENDIAN__)
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#error conflicting definitions of __LITTLE_ENDIAN__ and __BIG_ENDIAN__
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#endif
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#ifdef __cplusplus
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}
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#endif
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#endif /* PENDIAN_DETECT */
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