freebsd-dev/lib/libc/string/swab.3

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.\" Copyright (c) 1990, 1991, 1993
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.\" may be used to endorse or promote products derived from this software
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.\" @(#)swab.3 8.1 (Berkeley) 6/4/93
1999-08-28 00:22:10 +00:00
.\" $FreeBSD$
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.\"
.Dd March 4, 2012
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.Dt SWAB 3
.Os
.Sh NAME
.Nm swab
.Nd swap adjacent bytes
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.In unistd.h
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.Ft void
.Fn swab "const void * restrict src" "void * restrict dst" "ssize_t len"
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.Sh DESCRIPTION
The function
.Fn swab
copies
.Fa len
bytes from the location referenced by
.Fa src
to the location referenced by
.Fa dst ,
swapping adjacent bytes.
.Pp
The argument
.Fa len
must be an even number.
If
.Fa len
is less than zero, nothing will be done.
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.Sh SEE ALSO
.Xr bzero 3 ,
.Xr memset 3
.Sh HISTORY
A
.Fn swab
function appeared in
.At v7 .