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+.\" 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.
+.\"
+.\" 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.
+.\"
+.Dd November 18, 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 *dst" "const void *src" "size_t len"
+.Ft void *
+.Fn mempcpy "void *dst" "const void *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 .
+If
+.Fa src
+and
+.Fa dst
+overlap, the results are not defined.
+.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 strcpy 3 ,
+.Xr wmemcpy 3 ,
+.Xr wmempcpy 3
+.Sh STANDARDS
+The
+.Fn memcpy
+function
+conforms to
+.St -isoC .
+.Sh HISTORY
+The
+.Fn memcpy
+function first appeared in
+.At V
+and was reimplemented for
+.Bx 4.3 Tahoe .
+The
+.Fn mempcpy
+function first appeared in
+.Fx 13.1 .