63 lines
1.9 KiB
C
63 lines
1.9 KiB
C
/*! \file endian.h
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*
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* GNU and FreeBSD have various ways to express the
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* endianess but none of them is similiar enough. This
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* will create two defines that allows to decide on the
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* endian. The following will be defined to either 0 or
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* 1 at the end of the file.
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*
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* OSMO_IS_LITTLE_ENDIAN
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* OSMO_IS_BIG_ENDIAN
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*
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*/
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#pragma once
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#if defined(__FreeBSD__)
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#include <sys/endian.h>
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#if BYTE_ORDER == LITTLE_ENDIAN
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#define OSMO_IS_LITTLE_ENDIAN 1
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#define OSMO_IS_BIG_ENDIAN 0
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#elif BYTE_ORDER == BIG_ENDIAN
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#define OSMO_IS_LITTLE_ENDIAN 0
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#define OSMO_IS_BIG_ENDIAN 1
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#else
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#error "Unknown endian"
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#endif
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#elif defined(__APPLE__)
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#include <machine/endian.h>
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#if defined(__DARWIN_LITTLE_ENDIAN)
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#define OSMO_IS_LITTLE_ENDIAN 1
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#define OSMO_IS_BIG_ENDIAN 0
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#elif defined(__DARWIN_BIG_ENDIAN)
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#define OSMO_IS_LITTLE_ENDIAN 0
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#define OSMO_IS_BIG_ENDIAN 1
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#else
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#error "Unknown endian"
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#endif
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#elif defined(__linux__)
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#include <endian.h>
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#if __BYTE_ORDER == __LITTLE_ENDIAN
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#define OSMO_IS_LITTLE_ENDIAN 1
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#define OSMO_IS_BIG_ENDIAN 0
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#elif __BYTE_ORDER == __BIG_ENDIAN
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#define OSMO_IS_LITTLE_ENDIAN 0
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#define OSMO_IS_BIG_ENDIAN 1
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#else
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#error "Unknown endian"
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#endif
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#else
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/* let's try to rely on the compiler. GCC and CLANG/LLVM seem
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* to support this ... */
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define OSMO_IS_LITTLE_ENDIAN 1
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#define OSMO_IS_BIG_ENDIAN 0
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#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
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#define OSMO_IS_LITTLE_ENDIAN 0
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#define OSMO_IS_BIG_ENDIAN 1
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#else
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#error "Unknown endian"
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#endif
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#endif
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