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#	$NetBSD: popd,v 1.7 1995/05/11 21:31:13 christos Exp $

# Copyright (c) 1991, 1993

#	The Regents of the University of California.  All rights reserved.

#

# This code is derived from software contributed to Berkeley by

# Kenneth Almquist.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

# 1. Redistributions of source code must retain the above copyright

#    notice, this list of conditions and the following disclaimer.

# 2. Redistributions in binary form must reproduce the above copyright

#    notice, this list of conditions and the following disclaimer in the

#    documentation and/or other materials provided with the distribution.

# 3. All advertising materials mentioning features or use of this software

#    must display the following acknowledgement:

#	This product includes software developed by the University of

#	California, Berkeley and its contributors.

# 4. Neither the name of the University nor the names of its contributors

#    may be used to endorse or promote products derived from this software

#    without specific prior written permission.

#

# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND

# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE

# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE

# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS

# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY

# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF

# SUCH DAMAGE.

#

#	@(#)popd	8.2 (Berkeley) 5/4/95

# pushd, popd, and dirs --- written by Chris Bertin

# Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris

# as modified by Patrick Elam of GTRI and Kenneth Almquist at UW

pushd () {

	SAVE=`pwd`

	if [ "$1" = "" ] 

	then	if [ "$DSTACK" = "" ]

		then	echo "pushd: directory stack empty."

			return 1

		fi

		set $DSTACK

		cd $1 || return

		shift 1

		DSTACK="$*"

	else	cd $1 > /dev/null || return

	fi

	DSTACK="$SAVE $DSTACK"

	dirs

}

popd () {

	if [ "$DSTACK" = "" ] 

	then	echo "popd: directory stack empty."

		return 1

	fi

	set $DSTACK

	cd $1

	shift

	DSTACK=$*

	dirs

}

dirs () {

	echo "`pwd` $DSTACK"

	return 0

}