1;# pwd.pl - keeps track of current working directory in PWD environment var
2;#
3#
4# This library is no longer being maintained, and is included for backward
5# compatibility with Perl 4 programs which may require it.
6#
7# In particular, this should not be used as an example of modern Perl
8# programming techniques.
9#
10# Suggested alternative: Cwd
11#
12;# $RCSfile: pwd.pl,v $$Revision: 1.7 $$Date: 2003/12/03 03:02:36 $
13;#
14;# $Log: pwd.pl,v $
15;# Revision 1.7  2003/12/03 03:02:36  millert
16;# Resolve conflicts for perl 5.8.2, remove old files, and add OpenBSD-specific scaffolding
17;#
18;#
19;# Usage:
20;#	require "pwd.pl";
21;#	&initpwd;
22;#	...
23;#	&chdir($newdir);
24
25package pwd;
26
27sub main'initpwd {
28    if ($ENV{'PWD'}) {
29	local($dd,$di) = stat('.');
30	local($pd,$pi) = stat($ENV{'PWD'});
31	if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) {
32	    chop($ENV{'PWD'} = `pwd`);
33	}
34    }
35    else {
36	chop($ENV{'PWD'} = `pwd`);
37    }
38    if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) {
39	local($pd,$pi) = stat($2);
40	local($dd,$di) = stat($1);
41	if (defined $pd and defined $dd and $di == $pi and $dd == $pd) {
42	    $ENV{'PWD'}="$2$3";
43	}
44    }
45}
46
47sub main'chdir {
48    local($newdir) = shift;
49    $newdir =~ s|/{2,}|/|g;
50    if (chdir $newdir) {
51	if ($newdir =~ m#^/#) {
52	    $ENV{'PWD'} = $newdir;
53	}
54	else {
55	    local(@curdir) = split(m#/#,$ENV{'PWD'});
56	    @curdir = '' unless @curdir;
57	    foreach $component (split(m#/#, $newdir)) {
58		next if $component eq '.';
59		pop(@curdir),next if $component eq '..';
60		push(@curdir,$component);
61	    }
62	    $ENV{'PWD'} = join('/',@curdir) || '/';
63	}
64    }
65    else {
66	0;
67    }
68}
69
701;
71