\" Copyright (c) 1990, 1991, 1993
\" 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
\" are met:
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\" notice, this list of conditions and the following disclaimer in the
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\" may be used to endorse or promote products derived from this software
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\" 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
\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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\" from: @(#)memcpy.3 8.1 (Berkeley) 6/4/93
\" $NetBSD: memcpy.3,v 1.15 2023/08/13 04:20:07 wiz Exp $
\"
Dd August 1, 2023
Dt MEMCPY 3
Os
Sh NAME
Nm memcpy
Nd copy byte string
Sh LIBRARY
Lb libc
Sh SYNOPSIS
In string.h
Ft void *
Fn memcpy "void * restrict dst" "const void * restrict src" "size_t len"
Ft void *
Fn mempcpy "void * restrict dst" "const void * restrict src" "size_t len"
Sh DESCRIPTION
The
Fn memcpy
and
Fn mempcpy
functions
copy
Fa len
bytes from string
Fa src
to string
Fa dst .
The arguments must not overlap -- behavior if the arguments overlap is
undefined.
To copy byte strings that overlap, use
Xr memmove 3 .
Sh RETURN VALUES
The
Fn memcpy
function
returns the original value of
Fa dst .
Pp
The
Fn mempcpy
function returns a pointer to the byte after the last written byte.
Sh SEE ALSO
Xr bcopy 3 ,
Xr memccpy 3 ,
Xr memmove 3 ,
Xr wmemcpy 3 ,
Xr wmempcpy 3
Sh STANDARDS
The
Fn memcpy
function
conforms to
St -isoC-99 .
