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/* $NetBSD: bswap.h,v 1.19 2015/03/12 15:28:16 christos Exp $ */
/* Written by Manuel Bouyer. Public domain */
#ifndef _SYS_BSWAP_H_
#define _SYS_BSWAP_H_
#ifndef _LOCORE
#include <sys/stdint.h>
#include <machine/bswap.h>
__BEGIN_DECLS
/* Always declare the functions in case their address is taken (etc) */
#if defined(_KERNEL) || defined(_STANDALONE) || !defined(__BSWAP_RENAME)
uint16_t bswap16(uint16_t) __constfunc;
uint32_t bswap32(uint32_t) __constfunc;
#else
uint16_t bswap16(uint16_t) __RENAME(__bswap16) __constfunc;
uint32_t bswap32(uint32_t) __RENAME(__bswap32) __constfunc;
#endif
uint64_t bswap64(uint64_t) __constfunc;
__END_DECLS
#if defined(__GNUC__) && !defined(__lint__)
/* machine/byte_swap.h might have defined inline versions */
#ifndef __BYTE_SWAP_U64_VARIABLE
#define __BYTE_SWAP_U64_VARIABLE bswap64
#endif
#ifndef __BYTE_SWAP_U32_VARIABLE
#define __BYTE_SWAP_U32_VARIABLE bswap32
#endif
#ifndef __BYTE_SWAP_U16_VARIABLE
#define __BYTE_SWAP_U16_VARIABLE bswap16
#endif
#define __byte_swap_u64_constant(x) \
(__CAST(uint64_t, \
((((x) & 0xff00000000000000ull) >> 56) | \
(((x) & 0x00ff000000000000ull) >> 40) | \
(((x) & 0x0000ff0000000000ull) >> 24) | \
(((x) & 0x000000ff00000000ull) >> 8) | \
(((x) & 0x00000000ff000000ull) << 8) | \
(((x) & 0x0000000000ff0000ull) << 24) | \
(((x) & 0x000000000000ff00ull) << 40) | \
(((x) & 0x00000000000000ffull) << 56))))
#define __byte_swap_u32_constant(x) \
(__CAST(uint32_t, \
((((x) & 0xff000000) >> 24) | \
(((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | \
(((x) & 0x000000ff) << 24))))
#define __byte_swap_u16_constant(x) \
(__CAST(uint16_t, \
((((x) & 0xff00) >> 8) | \
(((x) & 0x00ff) << 8))))
#define bswap64(x) \
__CAST(uint64_t, __builtin_constant_p((x)) ? \
__byte_swap_u64_constant(x) : __BYTE_SWAP_U64_VARIABLE(x))
#define bswap32(x) \
__CAST(uint32_t, __builtin_constant_p((x)) ? \
__byte_swap_u32_constant(x) : __BYTE_SWAP_U32_VARIABLE(x))
#define bswap16(x) \
__CAST(uint16_t, __builtin_constant_p((x)) ? \
__byte_swap_u16_constant(x) : __BYTE_SWAP_U16_VARIABLE(x))
#endif /* __GNUC__ && !__lint__ */
#endif /* !_LOCORE */
#endif /* !_SYS_BSWAP_H_ */
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