80 lines
2.2 KiB
C
80 lines
2.2 KiB
C
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/* $NetBSD: bswap.h,v 1.16 2009/08/08 21:23:15 christos Exp $ */
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/* Written by Manuel Bouyer. Public domain */
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#ifndef _SYS_BSWAP_H_
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#define _SYS_BSWAP_H_
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#ifndef _LOCORE
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#include <sys/cdefs.h>
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#include <sys/types.h>
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#include <machine/bswap.h>
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__BEGIN_DECLS
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/* Always declare the functions in case their address is taken (etc) */
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#if defined(_KERNEL) || defined(_STANDALONE) || !defined(__BSWAP_RENAME)
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uint16_t bswap16(uint16_t) __constfunc;
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uint32_t bswap32(uint32_t) __constfunc;
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#else
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uint16_t bswap16(uint16_t) __RENAME(__bswap16) __constfunc;
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uint32_t bswap32(uint32_t) __RENAME(__bswap32) __constfunc;
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#endif
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uint64_t bswap64(uint64_t) __constfunc;
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__END_DECLS
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#if defined(__GNUC__) && defined(__OPTIMIZE__) && !defined(__lint__)
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/* machine/byte_swap.h might have defined inline versions */
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#ifndef __BYTE_SWAP_U64_VARIABLE
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#define __BYTE_SWAP_U64_VARIABLE bswap64
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#endif
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#ifndef __BYTE_SWAP_U32_VARIABLE
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#define __BYTE_SWAP_U32_VARIABLE bswap32
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#endif
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#ifndef __BYTE_SWAP_U16_VARIABLE
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#define __BYTE_SWAP_U16_VARIABLE bswap16
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#endif
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#define __byte_swap_u64_constant(x) \
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(__CAST(uint64_t, \
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((((x) & 0xff00000000000000ull) >> 56) | \
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(((x) & 0x00ff000000000000ull) >> 40) | \
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(((x) & 0x0000ff0000000000ull) >> 24) | \
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(((x) & 0x000000ff00000000ull) >> 8) | \
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(((x) & 0x00000000ff000000ull) << 8) | \
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(((x) & 0x0000000000ff0000ull) << 24) | \
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(((x) & 0x000000000000ff00ull) << 40) | \
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(((x) & 0x00000000000000ffull) << 56))))
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#define __byte_swap_u32_constant(x) \
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(__CAST(uint32_t, \
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((((x) & 0xff000000) >> 24) | \
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(((x) & 0x00ff0000) >> 8) | \
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(((x) & 0x0000ff00) << 8) | \
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(((x) & 0x000000ff) << 24))))
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#define __byte_swap_u16_constant(x) \
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(__CAST(uint16_t, \
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((((x) & 0xff00) >> 8) | \
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(((x) & 0x00ff) << 8))))
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#define bswap64(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
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#define bswap32(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
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#define bswap16(x) \
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(__builtin_constant_p((x)) ? \
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__byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
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#endif /* __GNUC__ && __OPTIMIZE__ */
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#endif /* !_LOCORE */
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#endif /* !_SYS_BSWAP_H_ */
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