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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1987, 1991 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. 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.
*/
#ifndef _SYS__ENDIAN_H_
#define _SYS__ENDIAN_H_
#if !defined(_MACHINE_ENDIAN_H_) && !defined(_BYTESWAP_H_) && !defined(_ENDIAN_H_)
#error "sys/_endian.h should not be included directly"
#endif
#include <sys/cdefs.h> /* visibility macros */
/* BSD Compatibility */
#define _BYTE_ORDER __BYTE_ORDER__
/*
* Definitions for byte order, according to byte significance from low
* address to high. We undefine any prior definition of them because
* powerpc compilers define _LITTLE_ENDIAN and _BIG_ENDIAN to mean
* something else.
*/
#undef _LITTLE_ENDIAN
#define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ /* LSB first: 1234 */
#undef _BIG_ENDIAN
#define _BIG_ENDIAN __ORDER_BIG_ENDIAN__ /* MSB first: 4321 */
#define _PDP_ENDIAN __ORDER_PDP_ENDIAN__ /* LSB first in word,
* MSW first in long: 3412 */
/*
* Define the order of 32-bit words in 64-bit words.
*/
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define _QUAD_HIGHWORD 1
#define _QUAD_LOWWORD 0
#elif _BYTE_ORDER == _BIG_ENDIAN
#define _QUAD_HIGHWORD 0
#define _QUAD_LOWWORD 1
#else
#error "Unsupported endian"
#endif
/*
* POSIX Issue 8 will require these for endian.h. Define them there and in the
* traditional BSD compilation environment. PDP_ENDIAN isn't strictly in Issue
* 8, but is allowed as implementations can define any *_ENDIAN symbol. Since
* issue 8 doesn't yet have an assigned date, use strictly greater than issue
* 7's date.
*/
#if __BSD_VISIBLE || _POSIX_C_SOURCE > 200809
#define LITTLE_ENDIAN _LITTLE_ENDIAN
#define BIG_ENDIAN _BIG_ENDIAN
#define PDP_ENDIAN _PDP_ENDIAN
#define BYTE_ORDER _BYTE_ORDER
#endif
/* bswap primitives, based on compiler builtins */
#define __bswap16(x) __builtin_bswap16(x)
#define __bswap32(x) __builtin_bswap32(x)
#define __bswap64(x) __builtin_bswap64(x)
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define __ntohl(x) (__bswap32(x))
#define __ntohs(x) (__bswap16(x))
#define __htonl(x) (__bswap32(x))
#define __htons(x) (__bswap16(x))
#elif _BYTE_ORDER == _BIG_ENDIAN
#define __htonl(x) ((__uint32_t)(x))
#define __htons(x) ((__uint16_t)(x))
#define __ntohl(x) ((__uint32_t)(x))
#define __ntohs(x) ((__uint16_t)(x))
#endif
/*
* Host to big endian, host to little endian, big endian to host, and little
* endian to host byte order functions as detailed in byteorder(9).
*/
#if _BYTE_ORDER == _LITTLE_ENDIAN
#define htobe16(x) __bswap16((x))
#define htobe32(x) __bswap32((x))
#define htobe64(x) __bswap64((x))
#define htole16(x) ((uint16_t)(x))
#define htole32(x) ((uint32_t)(x))
#define htole64(x) ((uint64_t)(x))
#define be16toh(x) __bswap16((x))
#define be32toh(x) __bswap32((x))
#define be64toh(x) __bswap64((x))
#define le16toh(x) ((uint16_t)(x))
#define le32toh(x) ((uint32_t)(x))
#define le64toh(x) ((uint64_t)(x))
#else /* _BYTE_ORDER != _LITTLE_ENDIAN */
#define htobe16(x) ((uint16_t)(x))
#define htobe32(x) ((uint32_t)(x))
#define htobe64(x) ((uint64_t)(x))
#define htole16(x) __bswap16((x))
#define htole32(x) __bswap32((x))
#define htole64(x) __bswap64((x))
#define be16toh(x) ((uint16_t)(x))
#define be32toh(x) ((uint32_t)(x))
#define be64toh(x) ((uint64_t)(x))
#define le16toh(x) __bswap16((x))
#define le32toh(x) __bswap32((x))
#define le64toh(x) __bswap64((x))
#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
#endif /* _SYS__ENDIAN_H_ */
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