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byteorder: Add a header file defining common byteswap functions 

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor 2018-05-04 14:15:12 -04:00
parent e3e3aa63d7
commit c2d48aba87
1 changed files with 40 additions and 0 deletions
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src/byteorder.h Normal file
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#ifndef __BYTEORDER_H
#define __BYTEORDER_H
#include <stdint.h> // uint32_t
#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
#define cpu_to_le16(x) ((uint16_t)(x))
#define cpu_to_le32(x) ((uint32_t)(x))
#define cpu_to_le64(x) ((uint64_t)(x))
#define le16_to_cpu(x) ((uint16_t)(x))
#define le32_to_cpu(x) ((uint32_t)(x))
#define le64_to_cpu(x) ((uint64_t)(x))
#define cpu_to_be16(x) __builtin_bswap16(x)
#define cpu_to_be32(x) __builtin_bswap32(x)
#define cpu_to_be64(x) __builtin_bswap64(x)
#define be16_to_cpu(x) __builtin_bswap16(x)
#define be32_to_cpu(x) __builtin_bswap32(x)
#define be64_to_cpu(x) __builtin_bswap64(x)
#else // big endian
#define cpu_to_le16(x) __builtin_bswap16(x)
#define cpu_to_le32(x) __builtin_bswap32(x)
#define cpu_to_le64(x) __builtin_bswap64(x)
#define le16_to_cpu(x) __builtin_bswap16(x)
#define le32_to_cpu(x) __builtin_bswap32(x)
#define le64_to_cpu(x) __builtin_bswap64(x)
#define cpu_to_be16(x) ((uint16_t)(x))
#define cpu_to_be32(x) ((uint32_t)(x))
#define cpu_to_be64(x) ((uint64_t)(x))
#define be16_to_cpu(x) ((uint16_t)(x))
#define be32_to_cpu(x) ((uint32_t)(x))
#define be64_to_cpu(x) ((uint64_t)(x))
#endif
#endif // byteorder.h