6f9f3b726b
https://bugs.freebsd.org/269753 PR: 269753 Reported by: Igor Ostapenko Approved by: doc, src (delphij, imp, zlei) Differential revision: https://reviews.freebsd.org/D38741
134 lines
4.7 KiB
C
134 lines
4.7 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1987, 1991 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _SYS__ENDIAN_H_
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#define _SYS__ENDIAN_H_
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#if !defined(_MACHINE_ENDIAN_H_) && !defined(_BYTESWAP_H_) && !defined(_ENDIAN_H_)
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#error "sys/_endian.h should not be included directly"
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#endif
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#include <sys/cdefs.h> /* visibility macros */
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/* BSD Compatibility */
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#define _BYTE_ORDER __BYTE_ORDER__
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/*
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* Definitions for byte order, according to byte significance from low
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* address to high. We undefine any prior definition of them because
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* powerpc compilers define _LITTLE_ENDIAN and _BIG_ENDIAN to mean
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* something else.
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*/
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#undef _LITTLE_ENDIAN
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#define _LITTLE_ENDIAN __ORDER_LITTLE_ENDIAN__ /* LSB first: 1234 */
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#undef _BIG_ENDIAN
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#define _BIG_ENDIAN __ORDER_BIG_ENDIAN__ /* MSB first: 4321 */
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#define _PDP_ENDIAN __ORDER_PDP_ENDIAN__ /* LSB first in word,
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* MSW first in long: 3412 */
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/*
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* Define the order of 32-bit words in 64-bit words.
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*/
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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#define _QUAD_HIGHWORD 1
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#define _QUAD_LOWWORD 0
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#elif _BYTE_ORDER == _BIG_ENDIAN
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#define _QUAD_HIGHWORD 0
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#define _QUAD_LOWWORD 1
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#else
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#error "Unsupported endian"
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#endif
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/*
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* POSIX Issue 8 will require these for endian.h. Define them there and in the
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* traditional BSD compilation environment. Since issue 8 doesn't yet have an
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* assigned date, use strictly greater than issue 7's date.
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*/
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#if __BSD_VISIBLE || _POSIX_C_SOURCE > 200809
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#define LITTLE_ENDIAN _LITTLE_ENDIAN
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#define BIG_ENDIAN _BIG_ENDIAN
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#define PDP_ENDIAN _PDP_ENDIAN
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#define BYTE_ORDER _BYTE_ORDER
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#endif
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/* bswap primitives, based on compiler builtins */
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#define __bswap16(x) __builtin_bswap16(x)
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#define __bswap32(x) __builtin_bswap32(x)
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#define __bswap64(x) __builtin_bswap64(x)
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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#define __ntohl(x) (__bswap32(x))
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#define __ntohs(x) (__bswap16(x))
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#define __htonl(x) (__bswap32(x))
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#define __htons(x) (__bswap16(x))
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#elif _BYTE_ORDER == _BIG_ENDIAN
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#define __htonl(x) ((__uint32_t)(x))
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#define __htons(x) ((__uint16_t)(x))
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#define __ntohl(x) ((__uint32_t)(x))
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#define __ntohs(x) ((__uint16_t)(x))
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#endif
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/*
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* Host to big endian, host to little endian, big endian to host, and little
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* endian to host byte order functions as detailed in byteorder(9).
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*/
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#if _BYTE_ORDER == _LITTLE_ENDIAN
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#define htobe16(x) __bswap16((x))
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#define htobe32(x) __bswap32((x))
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#define htobe64(x) __bswap64((x))
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#define htole16(x) ((uint16_t)(x))
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#define htole32(x) ((uint32_t)(x))
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#define htole64(x) ((uint64_t)(x))
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#define be16toh(x) __bswap16((x))
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#define be32toh(x) __bswap32((x))
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#define be64toh(x) __bswap64((x))
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#define le16toh(x) ((uint16_t)(x))
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#define le32toh(x) ((uint32_t)(x))
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#define le64toh(x) ((uint64_t)(x))
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#else /* _BYTE_ORDER != _LITTLE_ENDIAN */
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#define htobe16(x) ((uint16_t)(x))
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#define htobe32(x) ((uint32_t)(x))
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#define htobe64(x) ((uint64_t)(x))
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#define htole16(x) __bswap16((x))
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#define htole32(x) __bswap32((x))
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#define htole64(x) __bswap64((x))
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#define be16toh(x) ((uint16_t)(x))
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#define be32toh(x) ((uint32_t)(x))
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#define be64toh(x) ((uint64_t)(x))
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#define le16toh(x) __bswap16((x))
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#define le32toh(x) __bswap32((x))
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#define le64toh(x) __bswap64((x))
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#endif /* _BYTE_ORDER == _LITTLE_ENDIAN */
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#endif /* _SYS__ENDIAN_H_ */
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