endian.h
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#pragma once
#if defined(__FreeBSD__)
#include <sys/endian.h>
#if BYTE_ORDER == LITTLE_ENDIAN
#define OSMO_IS_LITTLE_ENDIAN 1
#define OSMO_IS_BIG_ENDIAN 0
#elif BYTE_ORDER == BIG_ENDIAN
#define OSMO_IS_LITTLE_ENDIAN 0
#define OSMO_IS_BIG_ENDIAN 1
#else
#error "Unknown endian"
#endif
#elif defined(__APPLE__)
#include <machine/endian.h>
#if defined(__DARWIN_LITTLE_ENDIAN)
#define OSMO_IS_LITTLE_ENDIAN 1
#define OSMO_IS_BIG_ENDIAN 0
#elif defined(__DARWIN_BIG_ENDIAN)
#define OSMO_IS_LITTLE_ENDIAN 0
#define OSMO_IS_BIG_ENDIAN 1
#else
#error "Unknown endian"
#endif
#elif defined(__linux__)
#include <endian.h>
#if __BYTE_ORDER == __LITTLE_ENDIAN
#define OSMO_IS_LITTLE_ENDIAN 1
#define OSMO_IS_BIG_ENDIAN 0
#elif __BYTE_ORDER == __BIG_ENDIAN
#define OSMO_IS_LITTLE_ENDIAN 0
#define OSMO_IS_BIG_ENDIAN 1
#else
#error "Unknown endian"
#endif
#else
/* let's try to rely on the compiler. GCC and CLANG/LLVM seem
* to support this ... */
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define OSMO_IS_LITTLE_ENDIAN 1
#define OSMO_IS_BIG_ENDIAN 0
#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
#define OSMO_IS_LITTLE_ENDIAN 0
#define OSMO_IS_BIG_ENDIAN 1
#else
#error "Unknown endian"
#endif
#endif
endian.h
GNU and FreeBSD have various ways to express the endianess but none of them is similiar enough.