/*
 * 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 (c) 1994, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

/*
 * Portions of this source code were derived from Berkeley 4.3 BSD
 * under license from the Regents of the University of California.
 */

#include <sys/param.h>
#include <sys/isa_defs.h>
#include <sys/types.h>
#include <sys/sysmacros.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/vnode.h>
#include <sys/uio.h>
#include <sys/debug.h>
#include <sys/file.h>
#include <sys/fcntl.h>

/*
 * Rename a file relative to a given directory
 */
int
renameat(int fromfd, char *old, int tofd, char *new)
{
	vnode_t	*fromvp = NULL;
	vnode_t	*tovp = NULL;
	file_t *fp;
	int error;
	char oldstart;
	char newstart;

	if (copyin(old, &oldstart, sizeof (char)) ||
	    copyin(new, &newstart, sizeof (char)))
		return (set_errno(EFAULT));

	if (fromfd == AT_FDCWD || tofd == AT_FDCWD) {
		proc_t *p = curproc;

		mutex_enter(&p->p_lock);
		if (fromfd == AT_FDCWD) {
			fromvp = PTOU(p)->u_cdir;
			VN_HOLD(fromvp);
		}
		if (tofd == AT_FDCWD) {
			tovp = PTOU(p)->u_cdir;
			VN_HOLD(tovp);
		}
		mutex_exit(&p->p_lock);
	}

	if (fromvp == NULL && oldstart != '/') {
		if ((fp = getf(fromfd)) == NULL) {
			if (tovp != NULL)
				VN_RELE(tovp);
			return (set_errno(EBADF));
		}
		fromvp = fp->f_vnode;
		VN_HOLD(fromvp);
		releasef(fromfd);
	}

	if (tovp == NULL && newstart != '/') {
		if ((fp = getf(tofd)) == NULL) {
			if (fromvp != NULL)
				VN_RELE(fromvp);
			return (set_errno(EBADF));
		}
		tovp = fp->f_vnode;
		VN_HOLD(tovp);
		releasef(tofd);
	}

	error = vn_renameat(fromvp, old, tovp, new, UIO_USERSPACE);

	if (fromvp != NULL)
		VN_RELE(fromvp);
	if (tovp != NULL)
		VN_RELE(tovp);
	if (error)
		return (set_errno(error));
	return (0);
}

int
rename(char *old, char *new)
{
	return (renameat(AT_FDCWD, old, AT_FDCWD, new));
}