Libc-763.11.tar.gz

[apple/libc.git] / string / memcpy.3

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.\"     @(#)memcpy.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/string/memcpy.3,v 1.9 2009/04/07 13:42:53 trasz Exp $
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.Dd June 4, 1993
.Dt MEMCPY 3
.Os
.Sh NAME
.Nm memcpy
.Nd copy memory area
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In string.h
.Ft void *
.Fo memcpy
.Fa "void *restrict s1"
.Fa "const void *restrict s2"
.Fa "size_t n"
.Fc
.Sh DESCRIPTION
The
.Fn memcpy
function
copies
.Fa n
bytes from memory area
.Fa s2
to memory area
.Fa s1 .
If 
.Fa s1
and 
.Fa s2
overlap, behavior is undefined.
Applications in which
.Fa s1
and 
.Fa s2 
might overlap should use
.Xr memmove 3
instead.
.Sh RETURN VALUES
The
.Fn memcpy
function
returns the original value of
.Fa s1 .
.Sh SEE ALSO
.Xr bcopy 3 ,
.Xr memccpy 3 ,
.Xr memmove 3 ,
.Xr strcpy 3 ,
.Xr wmemcpy 3
.Sh STANDARDS
The
.Fn memcpy
function
conforms to
.St -isoC .