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/* $OpenBSD: endian.h,v 1.7 1997/08/08 18:27:17 niklas Exp $ */
/* $NetBSD: endian.h,v 1.3 1996/10/13 19:57:59 cgd Exp $ */
/*
* Copyright (c) 1987, 1991, 1993
* The Regents of the University of California. 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``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 REGENTS OR CONTRIBUTORS 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.
*
* @(#)endian.h 8.1 (Berkeley) 6/10/93
*/
#ifndef _ENDIAN_H_
#define _ENDIAN_H_
/*
* Define the order of 32-bit words in 64-bit words.
*/
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#ifndef _POSIX_SOURCE
/*
* Definitions for byte order, according to byte significance from low
* address to high.
*/
#define LITTLE_ENDIAN 1234 /* LSB first: i386, vax */
#define BIG_ENDIAN 4321 /* MSB first: 68000, ibm, net */
#define PDP_ENDIAN 3412 /* LSB first in word, MSW first in long */
#define BYTE_ORDER LITTLE_ENDIAN
#include <sys/cdefs.h>
typedef u_int32_t in_addr_t;
typedef u_int16_t in_port_t;
__BEGIN_DECLS
#if 0
/*
* prototypes supplied for documentation purposes solely
*/
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));
u_int32_t htonl __P((u_int32_t));
u_int16_t htons __P((u_int16_t));
u_int32_t ntohl __P((u_int32_t));
u_int16_t ntohs __P((u_int16_t));
#endif
__END_DECLS
#ifdef __GNUC__
/* XXX perhaps some __asm would be better here? */
#define __byte_swap_int32_variable(x) \
({ register u_int32_t __x = (x); \
(((__x) & 0xff000000) >> 24) | (((__x) & 0x00ff0000) >> 8) | \
(((__x) & 0x0000ff00) << 8) | (((__x) & 0x000000ff) << 24); })
#define __byte_swap_int16_variable(x) \
({ register u_int16_t __x = (x); \
(((__x) & 0xff00) >> 8) | (((__x) & 0x00ff) << 8); })
#ifdef __OPTIMIZE__
#define __byte_swap_int32_constant(x) \
((((x) & 0xff000000) >> 24) | \
(((x) & 0x00ff0000) >> 8) | \
(((x) & 0x0000ff00) << 8) | \
(((x) & 0x000000ff) << 24))
#define __byte_swap_int16_constant(x) \
((((x) & 0xff00) >> 8) | \
(((x) & 0x00ff) << 8))
#define __byte_swap_int32(x) \
(__builtin_constant_p((x)) ? \
__byte_swap_int32_constant(x) : __byte_swap_int32_variable(x))
#define __byte_swap_int16(x) \
(__builtin_constant_p((x)) ? \
__byte_swap_int16_constant(x) : __byte_swap_int16_variable(x))
#else /* __OPTIMIZE__ */
#define __byte_swap_int32(x) __byte_swap_int32_variable(x)
#define __byte_swap_int16(x) __byte_swap_int16_variable(x)
#endif /* __OPTIMIZE__ */
#endif /* __GNUC__ */
/*
* Macros for big/little endian to host and vice versa.
*/
#define betoh32(x) __byte_swap_int32(x)
#define betoh16(x) __byte_swap_int16(x)
#define htobe32(x) __byte_swap_int32(x)
#define htobe16(x) __byte_swap_int16(x)
#define letoh32(x) (x)
#define letoh16(x) (x)
#define htole32(x) (x)
#define htole16(x) (x)
/*
* Macros for network/external number representation conversion.
*
* The way this works is that HTONS(x) modifies x and *can't* be used as
* and rvalue i.e. foo=HTONS(bar) is wrong. Likewise x=htons(x) should
* never be used where HTONS(x) will serve i.e. foo=htons(foo) is wrong.
* Failing to observe these rule will result in code that appears to work
* and probably does work, but generates gcc warnings on architectures
* where the macros are used to optimize away an unneeded conversion.
*/
#define ntohl(x) betoh32(x)
#define ntohs(x) betoh16(x)
#define htonl(x) htobe32(x)
#define htons(x) htobe16(x)
#define NTOHL(x) (void)((x) = ntohl(x))
#define NTOHS(x) (void)((x) = ntohs(x))
#define HTONL(x) (void)((x) = htonl(x))
#define HTONS(x) (void)((x) = htons(x))
#endif /* !_POSIX_SOURCE */
#endif /* !_ENDIAN_H_ */
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