170 lines
4.5 KiB
Groff
170 lines
4.5 KiB
Groff
.\" Copyright (c) 2002 Mike Barcroft <mike@FreeBSD.org>
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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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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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.\" $FreeBSD$
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.\"
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.Dd April 29, 2002
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.Dt BYTEORDER 9
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.Os
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.Sh NAME
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.Nm bswap16 , bswap32 , bswap64 ,
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.Nm be16toh , be32toh , be64toh , htobe16 , htobe32 , htobe64 ,
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.Nm htole16 , htole32 , htole64 , le16toh , le32toh , le64toh ,
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.Nm be16enc , be16dec , be32enc , be32dec , be64enc , be64dec ,
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.Nm le16enc , le16dec , le32enc , le32dec , le64enc , le64dec
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.Nd byte order operations
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.Sh SYNOPSIS
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.In sys/endian.h
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.Ft uint16_t
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.Fn bswap16 "uint16_t int16"
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.Ft uint32_t
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.Fn bswap32 "uint32_t int32"
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.Ft uint64_t
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.Fn bswap64 "uint64_t int64"
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.Ft uint16_t
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.Fn be16toh "uint16_t big16"
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.Ft uint32_t
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.Fn be32toh "uint32_t big32"
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.Ft uint64_t
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.Fn be64toh "uint64_t big64"
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.Ft uint16_t
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.Fn htobe16 "uint16_t host16"
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.Ft uint32_t
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.Fn htobe32 "uint32_t host32"
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.Ft uint64_t
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.Fn htobe64 "uint64_t host64"
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.Ft uint16_t
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.Fn htole16 "uint16_t host16"
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.Ft uint32_t
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.Fn htole32 "uint32_t host32"
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.Ft uint64_t
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.Fn htole64 "uint64_t host64"
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.Ft uint16_t
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.Fn le16toh "uint16_t little16"
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.Ft uint32_t
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.Fn le32toh "uint32_t little32"
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.Ft uint64_t
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.Fn le64toh "uint64_t little64"
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.Ft uint16_t
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.Fn be16dec "const void *"
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.Ft uint32_t
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.Fn be32dec "const void *"
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.Ft uint64_t
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.Fn be64dec "const void *"
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.Ft uint16_t
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.Fn le16dec "const void *"
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.Ft uint32_t
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.Fn le32dec "const void *"
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.Ft uint64_t
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.Fn le64dec "const void *"
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.Ft void
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.Fn be16enc "void *" uint16_t
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.Ft void
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.Fn be32enc "void *" uint32_t
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.Ft void
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.Fn be64enc "void *" uint64_t
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.Ft void
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.Fn le16enc "void *" uint16_t
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.Ft void
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.Fn le32enc "void *" uint32_t
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.Ft void
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.Fn le64enc "void *" uint64_t
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.Sh DESCRIPTION
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The
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.Fn bswap16 ,
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.Fn bswap32 ,
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and
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.Fn bswap64
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functions return a byte order swapped integer.
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On big endian systems, the number is converted to little endian byte order.
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On little endian systems, the number is converted to big endian byte order.
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.Pp
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The
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.Fn be16toh ,
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.Fn be32toh ,
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and
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.Fn be64toh
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functions return a big endian byte ordered integer
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converted to the system's native byte order.
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The return value will be the same as the argument on big endian systems.
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.Pp
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The
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.Fn le16toh ,
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.Fn le32toh ,
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and
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.Fn le64toh
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functions return a little endian byte ordered integer
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converted to the system's native byte order.
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The return value will be the same as the argument on little endian systems.
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.Pp
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The
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.Fn htobe16 ,
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.Fn htobe32 ,
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and
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.Fn htobe64
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functions return an integer in the system's native
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byte order converted to big endian byte order.
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The return value will be the same as the argument on big endian systems.
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.Pp
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The
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.Fn htole16 ,
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.Fn htole32 ,
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and
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.Fn htole64
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functions return a integer in the system's native
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byte order converted to little endian byte order.
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The return value will be the same as the argument on little endian systems.
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.Pp
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The
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.Fn be16enc ,
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.Fn be16dec ,
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.Fn be32enc ,
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.Fn be32dec ,
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.Fn be64enc ,
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.Fn be64dec ,
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.Fn le16enc ,
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.Fn le16dec ,
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.Fn le32enc ,
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.Fn le32dec ,
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.Fn le64enc ,
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and
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.Fn le64dec
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functions encode and decode integers to/from byte strings on any alignment
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in big/little endian format.
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.Sh SEE ALSO
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.Xr byteorder 3
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.Sh HISTORY
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The
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.Fn hto*
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and
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.Fn *toh
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functions first appeared in
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.Fx 5.0 ,
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and were originally developed by the
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.Nx
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project.
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.Pp
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The encode/decode functions first appeared in
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.Fx 5.1 .
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