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from: @(#)swab.3 8.1 (Berkeley) 6/4/93
$NetBSD: swab.3,v 1.15 2010/04/30 03:52:13 jruoho Exp $
.Dd April 30, 2010 .Dt SWAB 3 .Os .Sh NAME .Nm swab .Nd swap adjacent bytes .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft void .Fn swab "const void * restrict src" "void * restrict dst" "ssize_t len" .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.
The Regents of the University of California. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
from: @(#)swab.3 8.1 (Berkeley) 6/4/93
$NetBSD: swab.3,v 1.15 2010/04/30 03:52:13 jruoho Exp $
.Dd April 30, 2010 .Dt SWAB 3 .Os .Sh NAME .Nm swab .Nd swap adjacent bytes .Sh LIBRARY .Lb libc .Sh SYNOPSIS n unistd.h .Ft void .Fn swab "const void * restrict src" "void * restrict dst" "ssize_t len" .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.
p If .Fa len is negative or zero, .Fn swab does nothing. If .Fa len is odd, .Fn swab copies .Fa len - 1 bytes and the disposition of the last byte is unspecified. .Sh SEE ALSO .Xr bzero 3 , .Xr memset 3 .Sh STANDARDS The .Fn swab function conforms to .St -p1003.1-2001 . .Sh HISTORY A .Fn swab function appeared in .At v7 . It was originally documented to be .Dq useful for carrying binary data between PDP11's and other machines .
p In .Nx 6.0 the type of .Fa len was changed from .Vt size_t to .Vt ssize_t for .Tn POSIX compliance.
Indexes created Sat Sep 20 22:09:52 GMT 2025