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/*-
* Copyright (c) 2021 M. Warner Losh <imp@FreeBSD.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
/*
* A mostly Linux/glibc-compatible byteswap.h
*/
#ifndef _BYTESWAP_H_
#define _BYTESWAP_H_
/*
* sys/_endian.h brings in the shared interfaces between BSD's sys/endian.h, and
* glibc's endian.h. However, we need to include it here to get the
* __bswap{16,32,64} definitions that we use. sys/_endian.h has been consturcted to
* be compatible with including <endian.h>, <byteswap.h> or both in either order,
* as well as providing the BSD the bulk of sys/endian.h functionality.
*/
#include <sys/_endian.h>
/*
* glibc's <byteswap.h> defines the bswap_* and __bswap_* macros below. Most
* software uses either just <sys/endian.h>, or both <endian.h> and
* <byteswap.h>. However, one can't define bswap16, etc in <endian.h> because
* several software packages will define them only when they detect <endian.h>
* is included (but not when sys/endian.h is included). Defining bswap16, etc
* here causes compilation errors for those packages. <endian.h> and
* <byteswap.h> need to be paired together, with the below defines here, for
* the highest level of glibc compatibility.
*/
#define __bswap_16(x) __bswap16(x)
#define __bswap_32(x) __bswap32(x)
#define __bswap_64(x) __bswap64(x)
#define bswap_16(x) __bswap16(x)
#define bswap_32(x) __bswap32(x)
#define bswap_64(x) __bswap64(x)
#endif /* _BYTESWAP_H_ */
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