Commit | Line | Data |
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a0d0e21e LW |
1 | package Cwd; |
2 | require 5.000; | |
3 | require Exporter; | |
4 | ||
f06db76b AD |
5 | =head1 NAME |
6 | ||
7 | getcwd - get pathname of current working directory | |
8 | ||
9 | =head1 SYNOPSIS | |
10 | ||
4633a7c4 LW |
11 | use Cwd; |
12 | $dir = cwd; | |
13 | ||
14 | use Cwd; | |
15 | $dir = getcwd; | |
f06db76b AD |
16 | |
17 | use Cwd; | |
4633a7c4 | 18 | $dir = fastgetcwd; |
f06db76b AD |
19 | |
20 | use Cwd 'chdir'; | |
21 | chdir "/tmp"; | |
22 | print $ENV{'PWD'}; | |
23 | ||
24 | =head1 DESCRIPTION | |
25 | ||
26 | The getcwd() function re-implements the getcwd(3) (or getwd(3)) functions | |
4633a7c4 | 27 | in Perl. |
f06db76b | 28 | |
cb1a09d0 | 29 | The fastcwd() function looks the same as getcwd(), but runs faster. |
f06db76b AD |
30 | It's also more dangerous because you might conceivably chdir() out of a |
31 | directory that you can't chdir() back into. | |
32 | ||
4633a7c4 LW |
33 | The cwd() function looks the same as getcwd and fastgetcwd but is |
34 | implemented using the most natural and safe form for the current | |
35 | architecture. For most systems it is identical to `pwd` (but without | |
36 | the trailing line terminator). It is recommended that cwd (or another | |
37 | *cwd() function) is used in I<all> code to ensure portability. | |
38 | ||
39 | If you ask to override your chdir() built-in function, then your PWD | |
40 | environment variable will be kept up to date. (See | |
55497cff | 41 | L<perlsub/Overriding Builtin Functions>.) Note that it will only be |
1fef88e7 | 42 | kept up to date if all packages which use chdir import it from Cwd. |
4633a7c4 | 43 | |
f06db76b AD |
44 | =cut |
45 | ||
a0d0e21e | 46 | @ISA = qw(Exporter); |
e7ae0116 | 47 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); |
a0d0e21e LW |
48 | @EXPORT_OK = qw(chdir); |
49 | ||
4633a7c4 LW |
50 | # use strict; |
51 | ||
52 | sub _backtick_pwd { # The 'natural and safe form' for UNIX (pwd may be setuid root) | |
53 | my $cwd; | |
54 | chop($cwd = `pwd`); | |
55 | $cwd; | |
56 | } | |
57 | ||
58 | # Since some ports may predefine cwd internally (e.g., NT) | |
59 | # we take care not to override an existing definition for cwd(). | |
60 | ||
61 | *cwd = \&_backtick_pwd unless defined &cwd; | |
a0d0e21e | 62 | |
748a9306 | 63 | |
a0d0e21e LW |
64 | # By Brandon S. Allbery |
65 | # | |
66 | # Usage: $cwd = getcwd(); | |
67 | ||
68 | sub getcwd | |
69 | { | |
70 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
71 | ||
72 | unless (@cst = stat('.')) | |
73 | { | |
74 | warn "stat(.): $!"; | |
75 | return ''; | |
76 | } | |
77 | $cwd = ''; | |
42793c05 | 78 | $dotdots = ''; |
a0d0e21e LW |
79 | do |
80 | { | |
81 | $dotdots .= '/' if $dotdots; | |
82 | $dotdots .= '..'; | |
83 | @pst = @cst; | |
84 | unless (opendir(PARENT, $dotdots)) | |
85 | { | |
86 | warn "opendir($dotdots): $!"; | |
87 | return ''; | |
88 | } | |
89 | unless (@cst = stat($dotdots)) | |
90 | { | |
91 | warn "stat($dotdots): $!"; | |
92 | closedir(PARENT); | |
93 | return ''; | |
94 | } | |
95 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) | |
96 | { | |
97 | $dir = ''; | |
98 | } | |
99 | else | |
100 | { | |
101 | do | |
102 | { | |
3edbfbe5 TB |
103 | unless (defined ($dir = readdir(PARENT))) |
104 | { | |
a0d0e21e LW |
105 | warn "readdir($dotdots): $!"; |
106 | closedir(PARENT); | |
107 | return ''; | |
108 | } | |
109 | unless (@tst = lstat("$dotdots/$dir")) | |
110 | { | |
55497cff | 111 | # warn "lstat($dotdots/$dir): $!"; |
37120919 AD |
112 | # Just because you can't lstat this directory |
113 | # doesn't mean you'll never find the right one. | |
114 | # closedir(PARENT); | |
115 | # return ''; | |
a0d0e21e LW |
116 | } |
117 | } | |
118 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || | |
119 | $tst[1] != $pst[1]); | |
120 | } | |
121 | $cwd = "$dir/$cwd"; | |
122 | closedir(PARENT); | |
123 | } while ($dir); | |
f6c18ff1 | 124 | chop($cwd) unless $cwd eq '/'; # drop the trailing / |
a0d0e21e LW |
125 | $cwd; |
126 | } | |
127 | ||
128 | ||
129 | ||
130 | # By John Bazik | |
131 | # | |
132 | # Usage: $cwd = &fastcwd; | |
133 | # | |
134 | # This is a faster version of getcwd. It's also more dangerous because | |
135 | # you might chdir out of a directory that you can't chdir back into. | |
136 | ||
137 | sub fastcwd { | |
138 | my($odev, $oino, $cdev, $cino, $tdev, $tino); | |
139 | my(@path, $path); | |
140 | local(*DIR); | |
141 | ||
142 | ($cdev, $cino) = stat('.'); | |
143 | for (;;) { | |
40000a8c | 144 | my $direntry; |
a0d0e21e LW |
145 | ($odev, $oino) = ($cdev, $cino); |
146 | chdir('..'); | |
147 | ($cdev, $cino) = stat('.'); | |
148 | last if $odev == $cdev && $oino == $cino; | |
149 | opendir(DIR, '.'); | |
150 | for (;;) { | |
40000a8c AD |
151 | $direntry = readdir(DIR); |
152 | next if $direntry eq '.'; | |
153 | next if $direntry eq '..'; | |
a0d0e21e | 154 | |
40000a8c AD |
155 | last unless defined $direntry; |
156 | ($tdev, $tino) = lstat($direntry); | |
a0d0e21e LW |
157 | last unless $tdev != $odev || $tino != $oino; |
158 | } | |
159 | closedir(DIR); | |
40000a8c | 160 | unshift(@path, $direntry); |
a0d0e21e LW |
161 | } |
162 | chdir($path = '/' . join('/', @path)); | |
163 | $path; | |
164 | } | |
165 | ||
166 | ||
4633a7c4 | 167 | # Keeps track of current working directory in PWD environment var |
a0d0e21e LW |
168 | # Usage: |
169 | # use Cwd 'chdir'; | |
170 | # chdir $newdir; | |
171 | ||
4633a7c4 | 172 | my $chdir_init = 0; |
a0d0e21e | 173 | |
4633a7c4 | 174 | sub chdir_init { |
55497cff | 175 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'msdos') { |
a0d0e21e LW |
176 | my($dd,$di) = stat('.'); |
177 | my($pd,$pi) = stat($ENV{'PWD'}); | |
178 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { | |
4633a7c4 | 179 | $ENV{'PWD'} = cwd(); |
a0d0e21e LW |
180 | } |
181 | } | |
182 | else { | |
4633a7c4 | 183 | $ENV{'PWD'} = cwd(); |
a0d0e21e | 184 | } |
4633a7c4 | 185 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
a0d0e21e LW |
186 | if ($ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|) { |
187 | my($pd,$pi) = stat($2); | |
188 | my($dd,$di) = stat($1); | |
189 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { | |
190 | $ENV{'PWD'}="$2$3"; | |
191 | } | |
192 | } | |
193 | $chdir_init = 1; | |
194 | } | |
195 | ||
196 | sub chdir { | |
4633a7c4 LW |
197 | my $newdir = shift || ''; # allow for no arg (chdir to HOME dir) |
198 | $newdir =~ s|///*|/|g; | |
a0d0e21e | 199 | chdir_init() unless $chdir_init; |
4633a7c4 | 200 | return 0 unless CORE::chdir $newdir; |
c6538b72 | 201 | if ($^O eq 'VMS') { return $ENV{'PWD'} = $ENV{'DEFAULT'} } |
748a9306 | 202 | |
a0d0e21e LW |
203 | if ($newdir =~ m#^/#) { |
204 | $ENV{'PWD'} = $newdir; | |
4633a7c4 LW |
205 | } else { |
206 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
207 | @curdir = ('') unless @curdir; | |
208 | my $component; | |
a0d0e21e LW |
209 | foreach $component (split(m#/#, $newdir)) { |
210 | next if $component eq '.'; | |
211 | pop(@curdir),next if $component eq '..'; | |
212 | push(@curdir,$component); | |
213 | } | |
214 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
215 | } | |
4633a7c4 | 216 | 1; |
a0d0e21e LW |
217 | } |
218 | ||
4633a7c4 LW |
219 | |
220 | # --- PORTING SECTION --- | |
221 | ||
222 | # VMS: $ENV{'DEFAULT'} points to default directory at all times | |
c6538b72 | 223 | # 06-Mar-1996 Charles Bailey bailey@genetics.upenn.edu |
224 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined | |
225 | # in the process logical name table as the default device and directory | |
4633a7c4 LW |
226 | # seen by Perl. This may not be the same as the default device |
227 | # and directory seen by DCL after Perl exits, since the effects | |
228 | # the CRTL chdir() function persist only until Perl exits. | |
4633a7c4 LW |
229 | |
230 | sub _vms_cwd { | |
231 | return $ENV{'DEFAULT'} | |
232 | } | |
68dc0745 | 233 | |
4633a7c4 LW |
234 | sub _os2_cwd { |
235 | $ENV{'PWD'} = `cmd /c cd`; | |
236 | chop $ENV{'PWD'}; | |
237 | $ENV{'PWD'} =~ s:\\:/:g ; | |
238 | return $ENV{'PWD'}; | |
239 | } | |
240 | ||
68dc0745 | 241 | *_NT_cwd = \&_os2_cwd unless defined &_NT_cwd; |
242 | ||
55497cff | 243 | sub _msdos_cwd { |
244 | $ENV{'PWD'} = `command /c cd`; | |
245 | chop $ENV{'PWD'}; | |
246 | $ENV{'PWD'} =~ s:\\:/:g ; | |
247 | return $ENV{'PWD'}; | |
248 | } | |
249 | ||
ac1ad7f0 PM |
250 | { |
251 | local $^W = 0; # assignments trigger 'subroutine redefined' warning | |
4633a7c4 | 252 | |
ac1ad7f0 PM |
253 | if ($^O eq 'VMS') { |
254 | *cwd = \&_vms_cwd; | |
255 | *getcwd = \&_vms_cwd; | |
256 | *fastcwd = \&_vms_cwd; | |
257 | *fastgetcwd = \&_vms_cwd; | |
258 | } | |
259 | elsif ($^O eq 'NT' or $^O eq 'MSWin32') { | |
260 | # We assume that &_NT_cwd is defined as an XSUB or in the core. | |
68dc0745 | 261 | *cwd = \&_NT_cwd; |
ac1ad7f0 PM |
262 | *getcwd = \&_NT_cwd; |
263 | *fastcwd = \&_NT_cwd; | |
264 | *fastgetcwd = \&_NT_cwd; | |
265 | } | |
266 | elsif ($^O eq 'os2') { | |
267 | # sys_cwd may keep the builtin command | |
268 | *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
269 | *getcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
270 | *fastgetcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
271 | *fastcwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
272 | } | |
273 | elsif ($^O eq 'msdos') { | |
274 | *cwd = \&_msdos_cwd; | |
275 | *getcwd = \&_msdos_cwd; | |
276 | *fastgetcwd = \&_msdos_cwd; | |
277 | *fastcwd = \&_msdos_cwd; | |
278 | } | |
55497cff | 279 | } |
4633a7c4 LW |
280 | |
281 | # package main; eval join('',<DATA>) || die $@; # quick test | |
282 | ||
a0d0e21e LW |
283 | 1; |
284 | ||
4633a7c4 LW |
285 | __END__ |
286 | BEGIN { import Cwd qw(:DEFAULT chdir); } | |
287 | print join("\n", cwd, getcwd, fastcwd, ""); | |
288 | chdir('..'); | |
289 | print join("\n", cwd, getcwd, fastcwd, ""); | |
290 | print "$ENV{PWD}\n"; |