xref: /titanic_44/usr/src/lib/libc/port/i18n/wmemmove.c (revision 7257d1b4d25bfac0c802847390e98a464fd787ac)

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include "lint.h"
#include <sys/types.h>
#include <wchar.h>
#include <limits.h>
#include <string.h>
#include "libc.h"

wchar_t *
wmemmove(wchar_t *ws1, const wchar_t *ws2, size_t n)
{
	wchar_t	*ows1;
	size_t	max = SIZE_MAX / sizeof (wchar_t);

	if (n <= max) {
		return ((wchar_t *)memmove((void *)ws1,
		    (const void *)ws2, n * sizeof (wchar_t)));
	}

	ows1 = ws1;
	if (n != 0) {
		if (ws1 <= ws2) {
			do {
				*ws1++ = *ws2++;
			} while (--n != 0);
		} else {
			ws2 += n;
			ws1 += n;
			do {
				*--ws1 = *--ws2;
			} while (--n != 0);
		}
	}
	return (ows1);
}