1# Copyright (c) 1991, 1993
2#	The Regents of the University of California.  All rights reserved.
3# Copyright (c) 1997-2005
4#	Herbert Xu <herbert@gondor.apana.org.au>.  All rights reserved.
5#
6# This code is derived from software contributed to Berkeley by
7# Kenneth Almquist.
8#
9# Redistribution and use in source and binary forms, with or without
10# modification, are permitted provided that the following conditions
11# are met:
12# 1. Redistributions of source code must retain the above copyright
13#    notice, this list of conditions and the following disclaimer.
14# 2. Redistributions in binary form must reproduce the above copyright
15#    notice, this list of conditions and the following disclaimer in the
16#    documentation and/or other materials provided with the distribution.
17# 3. Neither the name of the University nor the names of its contributors
18#    may be used to endorse or promote products derived from this software
19#    without specific prior written permission.
20#
21# THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31# SUCH DAMAGE.
32#
33#	@(#)popd	8.2 (Berkeley) 5/4/95
34
35# pushd, popd, and dirs --- written by Chris Bertin
36# Pixel Computer Inc. ...!wjh12!pixel!pixutl!chris
37# as modified by Patrick Elam of GTRI and Kenneth Almquist at UW
38
39pushd () {
40	SAVE=`pwd`
41	if [ "$1" = "" ]
42	then	if [ "$DSTACK" = "" ]
43		then	echo "pushd: directory stack empty."
44			return 1
45		fi
46		set $DSTACK
47		cd $1 || return
48		shift 1
49		DSTACK="$*"
50	else	cd $1 > /dev/null || return
51	fi
52	DSTACK="$SAVE $DSTACK"
53	dirs
54}
55
56popd () {
57	if [ "$DSTACK" = "" ]
58	then	echo "popd: directory stack empty."
59		return 1
60	fi
61	set $DSTACK
62	cd $1
63	shift
64	DSTACK=$*
65	dirs
66}
67
68dirs () {
69	echo "`pwd` $DSTACK"
70	return 0
71}
72