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/* Macros to swap the order of bytes in integer values.
Copyright (C) 1997,1998,2000,2001,2002,2005 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#if !defined _BYTESWAP_H && !defined _NETINET_IN_H
# error "Never use <bits/byteswap.h> directly; include <byteswap.h> instead."
#endif
#ifndef _BITS_BYTESWAP_H
#define _BITS_BYTESWAP_H 1
/* Swap bytes in 16 bit value. */
#define __bswap_constant_16(x) \
((((x) >> 8) & 0xffu) | (((x) & 0xffu) << 8))
#ifndef __bswap_non_constant_16
# define __bswap_non_constant_16(x) __bswap_constant_16(x)
#endif
#ifdef __GNUC__
# define __bswap_16(x) \
(__extension__ \
({ unsigned short int __bsv, __bsx = (x); \
if (__builtin_constant_p (__bsx)) \
__bsv = __bswap_constant_16 (__bsx); \
else \
__bsv = __bswap_non_constant_16 (__bsx); \
__bsv; }))
#else
static __inline unsigned short int
__bswap_16 (unsigned short int __bsx)
{
return __bswap_constant_16 (__bsx);
}
#endif
/* Swap bytes in 32 bit value. */
#define __bswap_constant_32(x) \
((((x) & 0xff000000u) >> 24) | (((x) & 0x00ff0000u) >> 8) | \
(((x) & 0x0000ff00u) << 8) | (((x) & 0x000000ffu) << 24))
#ifndef __bswap_non_constant_32
# define __bswap_non_constant_32(x) __bswap_constant_32(x)
#endif
#ifdef __GNUC__
# define __bswap_32(x) \
(__extension__ \
({ unsigned int __bsv, __bsx = (x); \
if (__builtin_constant_p (__bsx)) \
__bsv = __bswap_constant_32 (__bsx); \
else \
__bsv = __bswap_non_constant_32 (__bsx); \
__bsv; }))
#else
static __inline unsigned int
__bswap_32 (unsigned int __bsx)
{
return __bswap_constant_32 (__bsx);
}
#endif
#if defined __GNUC__ && __GNUC__ >= 2
/* Swap bytes in 64 bit value. */
# define __bswap_constant_64(x) \
((((x) & 0xff00000000000000ull) >> 56) \
| (((x) & 0x00ff000000000000ull) >> 40) \
| (((x) & 0x0000ff0000000000ull) >> 24) \
| (((x) & 0x000000ff00000000ull) >> 8) \
| (((x) & 0x00000000ff000000ull) << 8) \
| (((x) & 0x0000000000ff0000ull) << 24) \
| (((x) & 0x000000000000ff00ull) << 40) \
| (((x) & 0x00000000000000ffull) << 56))
# ifndef __bswap_non_constant_64
# define __bswap_non_constant_64(x) \
(__extension__ \
({ union { __extension__ unsigned long long int __ll; \
unsigned int __l[2]; } __w, __r; \
__w.__ll = (x); \
__r.__l[0] = __bswap_non_constant_32 (__w.__l[1]); \
__r.__l[1] = __bswap_non_constant_32 (__w.__l[0]); \
__r.__ll; }))
# endif
# define __bswap_64(x) \
(__extension__ \
({ __extension__ unsigned long long int __ll; \
if (__builtin_constant_p (x)) \
__ll = __bswap_constant_64 (x); \
else \
__ll = __bswap_non_constant_64 (x); \
__ll; }))
#endif
#endif /* _BITS_BYTESWAP_H */
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