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//==========================================================================
//
// include/sys/endian.h
//
//
//
//==========================================================================
// ####BSDALTCOPYRIGHTBEGIN####
// -------------------------------------------
// Portions of this software may have been derived from OpenBSD
// or other sources, and if so are covered by the appropriate copyright
// and license included herein.
// -------------------------------------------
// ####BSDALTCOPYRIGHTEND####
//==========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): gthomas
// Contributors: gthomas
// Date: 2000-01-10
// Purpose:
// Description:
//
//
//####DESCRIPTIONEND####
//
//==========================================================================
/* $OpenBSD: endian.h,v 1.4 1999/07/21 05:58:25 csapuntz Exp $ */
/*-
* Copyright (c) 1997 Niklas Hallqvist. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Niklas Hallqvist.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Generic definitions for little- and big-endian systems. Other endianesses
* has to be dealt with in the specific machine/endian.h file for that port.
*
* This file is meant to be included from a little- or big-endian port's
* machine/endian.h after setting BYTE_ORDER to either 1234 for little endian
* or 4321 for big..
*/
#ifndef _SYS_ENDIAN_H_
#define _SYS_ENDIAN_H_
#ifndef _POSIX_SOURCE
#include <sys/cdefs.h>
#define LITTLE_ENDIAN 1234
#define BIG_ENDIAN 4321
#define PDP_ENDIAN 3412
#ifdef __GNUC__
#define __swap16gen(x) ({ \
u_int16_t __swap16gen_x = (x); \
\
(u_int16_t)((__swap16gen_x & 0xff) << 8 | \
(__swap16gen_x & 0xff00) >> 8); \
})
#define __swap32gen(x) ({ \
u_int32_t __swap32gen_x = (x); \
\
(u_int32_t)((__swap32gen_x & 0xff) << 24 | \
(__swap32gen_x & 0xff00) << 8 | \
(__swap32gen_x & 0xff0000) >> 8 | \
(__swap32gen_x & 0xff000000) >> 24); \
})
#else /* __GNUC__ */
/* Note that these macros evaluate their arguments several times. */
#define __swap16gen(x) \
(u_int16_t)(((u_int16_t)(x) & 0xff) << 8 | ((u_int16_t)(x) & 0xff00) >> 8)
#define __swap32gen(x) \
(u_int32_t)(((u_int32_t)(x) & 0xff) << 24 | \
((u_int32_t)(x) & 0xff00) << 8 | ((u_int32_t)(x) & 0xff0000) >> 8 | \
((u_int32_t)(x) & 0xff000000) >> 24)
#endif /* __GNUC__ */
/*
* Define MD_SWAP if you provide swap{16,32}md functions/macros that are
* optimized for your architecture, These will be used for swap{16,32}
* unless the argument is a constant and we are using GCC, where we can
* take advantage of the CSE phase much better by using the generic version.
*/
#ifdef MD_SWAP
#if __GNUC__
#define swap16(x) ({ \
u_int16_t __swap16_x = (x); \
\
__builtin_constant_p(x) ? __swap16gen(__swap16_x) : \
__swap16md(__swap16_x); \
})
#define swap32(x) ({ \
u_int32_t __swap32_x = (x); \
\
__builtin_constant_p(x) ? __swap32gen(__swap32_x) : \
__swap32md(__swap32_x); \
})
#endif /* __GNUC__ */
#else /* MD_SWAP */
#define swap16 __swap16gen
#define swap32 __swap32gen
#endif /* MD_SWAP */
#define swap16_multi(v, n) do { \
size_t __swap16_multi_n = (n); \
u_int16_t *__swap16_multi_v = (v); \
\
while (__swap16_multi_n) { \
*__swap16_multi_v = swap16(*__swap16_multi_v); \
__swap16_multi_v++; \
__swap16_multi_n--; \
} \
} while (0)
__BEGIN_DECLS
u_int32_t htobe32 __P((u_int32_t));
u_int16_t htobe16 __P((u_int16_t));
u_int32_t betoh32 __P((u_int32_t));
u_int16_t betoh16 __P((u_int16_t));
u_int32_t htole32 __P((u_int32_t));
u_int16_t htole16 __P((u_int16_t));
u_int32_t letoh32 __P((u_int32_t));
u_int16_t letoh16 __P((u_int16_t));
__END_DECLS
#if BYTE_ORDER == LITTLE_ENDIAN
/* Can be overridden by machine/endian.h before inclusion of this file. */
#ifndef _QUAD_HIGHWORD
#define _QUAD_HIGHWORD 1
#endif
#ifndef _QUAD_LOWWORD
#define _QUAD_LOWWORD 0
#endif
#define htobe16 swap16
#define htobe32 swap32
#define betoh16 swap16
#define betoh32 swap32
#define htole16(x) (x)
#define htole32(x) (x)
#define letoh16(x) (x)
#define letoh32(x) (x)
#endif /* BYTE_ORDER */
#if BYTE_ORDER == BIG_ENDIAN
/* Can be overridden by machine/endian.h before inclusion of this file. */
#ifndef _QUAD_HIGHWORD
#define _QUAD_HIGHWORD 0
#endif
#ifndef _QUAD_LOWWORD
#define _QUAD_LOWWORD 1
#endif
#define htole16 swap16
#define htole32 swap32
#define letoh16 swap16
#define letoh32 swap32
#define htobe16(x) (x)
#define htobe32(x) (x)
#define betoh16(x) (x)
#define betoh32(x) (x)
#endif /* BYTE_ORDER */
#define htons htobe16
#define htonl htobe32
#define ntohs betoh16
#define ntohl betoh32
#define NTOHL(x) (x) = ntohl((u_int32_t)(x))
#define NTOHS(x) (x) = ntohs((u_int16_t)(x))
#define HTONL(x) (x) = htonl((u_int32_t)(x))
#define HTONS(x) (x) = htons((u_int16_t)(x))
#endif /* _POSIX_SOURCE */
#endif /* _SYS_ENDIAN_H_ */
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