/*
 * 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) 1988 AT&T */
/* All Rights Reserved */
/*
 * Copyright 1997 Sun Microsystems, Inc. All rights reserved.
 * Use is subject to license terms.
 */
/*
 * @(#)dname.c 1.4 06/12/12
 */

#ident	"@(#)dname.c"
#ident	"@(#)sccs:lib/mpwlib/dname.c"
# include	<sys/types.h>
# include	<macros.h>

/*
	Returns directory name containing a file
	(by modifying its argument).
	Returns "." if current
	directory; handles root correctly.
	Returns its argument.
	Bugs: doesn't handle null strings correctly.
*/

char *dname(p)
char *p;
{
	register char *c;
	register int s;
	unsigned	strlen();

	s = size(p);
	for(c = p+s-2; c > p; c--)
		if(*c == '/') {
			*c = '\0';
			return(p);
		}
	if (p[0] != '/')
		p[0] = '.';
	p[1] = 0;
	return(p);
}
