/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/


/*
 * Copyright  (c) 1986 AT&T
 *	All Rights Reserved
 */
#ident	"%Z%%M%	%I%	%E% SMI"       /* SVr4.0 1.1 */

#include	<stdio.h>
#include	"wish.h"

char *
memshift(dst, src, len)
char	*dst;
char	*src;
int	len;
{
	register char	*d;
	register char	*s;
	register int	n;
	extern char	*memcpy();

	if (dst < src)
		if (dst + len <= src)
			memcpy(dst, src, len);
		else
			for (s = src, d = dst, n = len; n > 0; n--)
				*d++ = *s++;
	else
		if (src + len <= dst)
			return memcpy(dst, src, len);
		else
			for (n = len, s = src + n, d = dst + n; n > 0; n--)
				*--d = *--s;
	return dst;
}