remove some incredible lies about overlapping buffers

ok guenther

src/lib/libc/string/memcpy.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: memcpy.3,v 1.8 2011/07/25 00:38:52 schwarze Exp $
+.\"	$OpenBSD: memcpy.3,v 1.9 2013/06/04 03:02:09 deraadt Exp $
 .\"
 .\" Copyright (c) 1990, 1991 The Regents of the University of California.
 .\" All rights reserved.
@@ -31,7 +31,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: July 25 2011 $
+.Dd $Mdocdate: June 4 2013 $
 .Dt MEMCPY 3
 .Os
 .Sh NAME
@@ -50,6 +50,9 @@ bytes from buffer
 .Fa src
 to buffer
 .Fa dst .
+If the two buffers may overlap,
+.Xr memmove 3
+must be used instead.
 .Sh RETURN VALUES
 The
 .Fn memcpy
@@ -74,12 +77,3 @@ function first appeared in
 .At V
 and was reimplemented for
 .Bx 4.3 Tahoe .
-.Sh CAVEATS
-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 portable, safe solution is to use
-.Xr memmove 3 .

src/lib/libc/string/wmemcpy.3

@@ -1,4 +1,4 @@
-.\"	$OpenBSD: wmemcpy.3,v 1.3 2011/07/25 00:38:53 schwarze Exp $
+.\"	$OpenBSD: wmemcpy.3,v 1.4 2013/06/04 03:02:09 deraadt Exp $
 .\"
 .\" Copyright (c) 1990, 1991 The Regents of the University of California.
 .\" All rights reserved.
@@ -31,7 +31,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: July 25 2011 $
+.Dd $Mdocdate: June 4 2013 $
 .Dt WMEMCPY 3
 .Os
 .Sh NAME
@@ -50,6 +50,9 @@ wide characters from buffer
 .Fa src
 to buffer
 .Fa dst .
+If the two buffers may overlap,
+.Xr wmemmove 3
+must be used instead.
 .Sh RETURN VALUES
 The
 .Fn wmemcpy
@@ -74,12 +77,3 @@ function was ported from
 .Nx
 and first appeared in
 .Ox 3.8 .
-.Sh CAVEATS
-In this implementation
-.Fn wmemcpy
-is implemented using
-.Xr bcopy 3 ,
-and therefore the buffers may overlap.
-On other systems, copying overlapping buffers may produce surprises.
-A portable, safe solution is to use
-.Xr wmemmove 3 .