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