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1761b09bf4
For endian.h to work instead of sys/endian.h, some software needs
byteswap.h available. It must define {__,}byteswap_{16,32,64}.
Included sys/_endian.h to get an appropriate __byteswap16, etc
and defines the new macros in terms of them. Enhance _endian.h
to allow it to be included from here too.
Sponsored by: Netflix
Reviewed by: markj
Differential Revision: https://reviews.freebsd.org/D32051
42 lines
1.4 KiB
C
42 lines
1.4 KiB
C
/*-
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* Copyright (c) 2021 M. Warner Losh <imp@FreeBSD.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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/*
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* A mostly Linux/glibc-compatible byteswap.h
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*/
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#ifndef _BYTESWAP_H_
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#define _BYTESWAP_H_
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/*
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* sys/_endian.h brings in the shared interfaces between BSD's sys/endian.h, and
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* glibc's endian.h. However, we need to include it here to get the
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* __bswap{16,32,64} definitions that we use. sys/_endian.h has been consturcted to
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* be compatible with including <endian.h>, <byteswap.h> or both in either order,
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* as well as providing the BSD the bulk of sys/endian.h functionality.
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*/
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#include <sys/_endian.h>
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/*
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* glibc's <byteswap.h> defines the bswap_* and __bswap_* macros below. Most
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* software uses either just <sys/endian.h>, or both <endian.h> and
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* <byteswap.h>. However, one can't define bswap16, etc in <endian.h> because
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* several software packages will define them only when they detect <endian.h>
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* is included (but not when sys/endian.h is included). Defining bswap16, etc
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* here causes compilation errors for those packages. <endian.h> and
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* <byteswap.h> need to be paired together, with the below defines here, for
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* the highest level of glibc compatibility.
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*/
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#define __bswap_16(x) __bswap16(x)
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#define __bswap_32(x) __bswap32(x)
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#define __bswap_64(x) __bswap64(x)
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#define bswap_16(x) __bswap16(x)
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#define bswap_32(x) __bswap32(x)
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#define bswap_64(x) __bswap64(x)
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#endif /* _BYTESWAP_H_ */
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