.\" Copyright (c) 1990, 1991 The Regents of the University of California.
.\" All rights reserved.
.\"
.\" This code is derived from software contributed to Berkeley by
.\" Chris Torek and the American National Standards Committee X3,
.\" on Information Processing Systems.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"    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
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\"	$OpenBSD: memcpy.3,v 1.6 2003/06/21 12:04:01 avsm Exp $
.\"
.Dd June 29, 1991
.Dt MEMCPY 3
.Os
.Sh NAME
.Nm memcpy
.Nd copy bytes
.Sh SYNOPSIS
.Fd #include <string.h>
.Ft void *
.Fn memcpy "void *dst" "const void *src" "size_t len"
.Sh DESCRIPTION
The
.Fn memcpy
function copies
.Fa len
bytes from buffer
.Fa src
to buffer
.Fa dst .
.Sh RETURN VALUES
The
.Fn memcpy
function returns the original value of
.Fa dst .
.Sh SEE ALSO
.Xr bcopy 3 ,
.Xr memccpy 3 ,
.Xr memmove 3 ,
.Xr strcpy 3 ,
.Xr strlcpy 3
.Sh STANDARDS
The
.Fn memcpy
function conforms to
.St -ansiC .
.Sh BUGS
In this implementation
.Fn memcpy
is implemented using
.Xr bcopy 3 ,
and therefore the buffers may overlap.
On other systems, copying overlapping buffers may produce surprises.
A simpler solution is to not use
.Fn memcpy .