Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | package Cwd; |
a0d0e21e | 2 | |
f06db76b AD |
3 | =head1 NAME |
4 | ||
902bacac | 5 | Cwd - get pathname of current working directory |
f06db76b AD |
6 | |
7 | =head1 SYNOPSIS | |
8 | ||
4633a7c4 | 9 | use Cwd; |
04929354 | 10 | my $dir = getcwd; |
4633a7c4 | 11 | |
04929354 MS |
12 | use Cwd 'abs_path'; |
13 | my $abs_path = abs_path($file); | |
f06db76b | 14 | |
04929354 | 15 | =head1 DESCRIPTION |
902bacac | 16 | |
04929354 MS |
17 | This module provides functions for determining the pathname of the |
18 | current working directory. It is recommended that getcwd (or another | |
19 | *cwd() function) be used in I<all> code to ensure portability. | |
f06db76b | 20 | |
04929354 | 21 | By default, it exports the functions cwd(), getcwd(), fastcwd(), and |
09122b95 | 22 | fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace. |
f06db76b | 23 | |
20408e3c | 24 | |
04929354 | 25 | =head2 getcwd and friends |
20408e3c | 26 | |
04929354 MS |
27 | Each of these functions are called without arguments and return the |
28 | absolute path of the current working directory. | |
f06db76b | 29 | |
04929354 MS |
30 | =over 4 |
31 | ||
32 | =item getcwd | |
33 | ||
34 | my $cwd = getcwd(); | |
35 | ||
36 | Returns the current working directory. | |
37 | ||
fa52125f SP |
38 | Exposes the POSIX function getcwd(3) or re-implements it if it's not |
39 | available. | |
04929354 MS |
40 | |
41 | =item cwd | |
42 | ||
43 | my $cwd = cwd(); | |
44 | ||
45 | The cwd() is the most natural form for the current architecture. For | |
46 | most systems it is identical to `pwd` (but without the trailing line | |
47 | terminator). | |
48 | ||
04929354 MS |
49 | =item fastcwd |
50 | ||
51 | my $cwd = fastcwd(); | |
52 | ||
53 | A more dangerous version of getcwd(), but potentially faster. | |
54 | ||
55 | It might conceivably chdir() you out of a directory that it can't | |
56 | chdir() you back into. If fastcwd encounters a problem it will return | |
57 | undef but will probably leave you in a different directory. For a | |
58 | measure of extra security, if everything appears to have worked, the | |
59 | fastcwd() function will check that it leaves you in the same directory | |
60 | that it started in. If it has changed it will C<die> with the message | |
61 | "Unstable directory path, current directory changed | |
62 | unexpectedly". That should never happen. | |
63 | ||
64 | =item fastgetcwd | |
65 | ||
66 | my $cwd = fastgetcwd(); | |
f06db76b | 67 | |
902bacac | 68 | The fastgetcwd() function is provided as a synonym for cwd(). |
fb73857a | 69 | |
09122b95 RGS |
70 | =item getdcwd |
71 | ||
72 | my $cwd = getdcwd(); | |
73 | my $cwd = getdcwd('C:'); | |
74 | ||
75 | The getdcwd() function is also provided on Win32 to get the current working | |
76 | directory on the specified drive, since Windows maintains a separate current | |
77 | working directory for each drive. If no drive is specified then the current | |
78 | drive is assumed. | |
79 | ||
80 | This function simply calls the Microsoft C library _getdcwd() function. | |
81 | ||
04929354 MS |
82 | =back |
83 | ||
902bacac | 84 | |
04929354 MS |
85 | =head2 abs_path and friends |
86 | ||
87 | These functions are exported only on request. They each take a single | |
3ee63918 MS |
88 | argument and return the absolute pathname for it. If no argument is |
89 | given they'll use the current working directory. | |
04929354 MS |
90 | |
91 | =over 4 | |
92 | ||
93 | =item abs_path | |
94 | ||
95 | my $abs_path = abs_path($file); | |
96 | ||
97 | Uses the same algorithm as getcwd(). Symbolic links and relative-path | |
98 | components ("." and "..") are resolved to return the canonical | |
99 | pathname, just like realpath(3). | |
100 | ||
101 | =item realpath | |
102 | ||
103 | my $abs_path = realpath($file); | |
104 | ||
105 | A synonym for abs_path(). | |
106 | ||
107 | =item fast_abs_path | |
108 | ||
510179aa | 109 | my $abs_path = fast_abs_path($file); |
04929354 MS |
110 | |
111 | A more dangerous, but potentially faster version of abs_path. | |
112 | ||
113 | =back | |
114 | ||
115 | =head2 $ENV{PWD} | |
116 | ||
117 | If you ask to override your chdir() built-in function, | |
118 | ||
119 | use Cwd qw(chdir); | |
120 | ||
121 | then your PWD environment variable will be kept up to date. Note that | |
122 | it will only be kept up to date if all packages which use chdir import | |
123 | it from Cwd. | |
4633a7c4 | 124 | |
4633a7c4 | 125 | |
4d6b4052 JH |
126 | =head1 NOTES |
127 | ||
128 | =over 4 | |
129 | ||
130 | =item * | |
131 | ||
04929354 MS |
132 | Since the path seperators are different on some operating systems ('/' |
133 | on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec | |
134 | modules wherever portability is a concern. | |
135 | ||
04929354 | 136 | =item * |
4d6b4052 JH |
137 | |
138 | Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()> | |
139 | functions are all aliases for the C<cwd()> function, which, on Mac OS, | |
140 | calls `pwd`. Likewise, the C<abs_path()> function is an alias for | |
141 | C<fast_abs_path()>. | |
142 | ||
143 | =back | |
144 | ||
02cc4877 NC |
145 | =head1 AUTHOR |
146 | ||
147 | Originally by the perl5-porters. | |
148 | ||
78321866 | 149 | Maintained by Ken Williams <KWILLIAMS@cpan.org> |
02cc4877 | 150 | |
99f36a73 RGS |
151 | =head1 COPYRIGHT |
152 | ||
153 | Copyright (c) 2004 by the Perl 5 Porters. All rights reserved. | |
154 | ||
155 | This program is free software; you can redistribute it and/or modify | |
156 | it under the same terms as Perl itself. | |
157 | ||
158 | Portions of the C code in this library are copyright (c) 1994 by the | |
159 | Regents of the University of California. All rights reserved. The | |
160 | license on this code is compatible with the licensing of the rest of | |
161 | the distribution - please see the source code in F<Cwd.xs> for the | |
162 | details. | |
163 | ||
04929354 MS |
164 | =head1 SEE ALSO |
165 | ||
166 | L<File::chdir> | |
167 | ||
f06db76b AD |
168 | =cut |
169 | ||
b060a406 | 170 | use strict; |
a9939470 | 171 | use Exporter; |
99f36a73 RGS |
172 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); |
173 | ||
6a288e04 | 174 | $VERSION = '3.15'; |
96e4d5b1 | 175 | |
a9939470 NC |
176 | @ISA = qw/ Exporter /; |
177 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); | |
09122b95 | 178 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 | 179 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e | 180 | |
f5f423e4 IZ |
181 | # sys_cwd may keep the builtin command |
182 | ||
183 | # All the functionality of this module may provided by builtins, | |
184 | # there is no sense to process the rest of the file. | |
185 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? | |
186 | ||
a9939470 | 187 | if ($^O eq 'os2') { |
f5f423e4 | 188 | local $^W = 0; |
a9939470 NC |
189 | |
190 | *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
191 | *getcwd = \&cwd; | |
192 | *fastgetcwd = \&cwd; | |
193 | *fastcwd = \&cwd; | |
194 | ||
195 | *fast_abs_path = \&sys_abspath if defined &sys_abspath; | |
196 | *abs_path = \&fast_abs_path; | |
197 | *realpath = \&fast_abs_path; | |
198 | *fast_realpath = \&fast_abs_path; | |
199 | ||
f5f423e4 IZ |
200 | return 1; |
201 | } | |
202 | ||
b04f6d36 | 203 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
f22d8e4b | 204 | eval { |
b04f6d36 RGS |
205 | if ( $] >= 5.006 ) { |
206 | require XSLoader; | |
207 | XSLoader::load( __PACKAGE__, $VERSION ); | |
208 | } else { | |
209 | require DynaLoader; | |
210 | push @ISA, 'DynaLoader'; | |
211 | __PACKAGE__->bootstrap( $VERSION ); | |
212 | } | |
f22d8e4b | 213 | }; |
4633a7c4 | 214 | |
99f36a73 RGS |
215 | # Must be after the DynaLoader stuff: |
216 | $VERSION = eval $VERSION; | |
217 | ||
09122b95 RGS |
218 | # Big nasty table of function aliases |
219 | my %METHOD_MAP = | |
220 | ( | |
221 | VMS => | |
222 | { | |
223 | cwd => '_vms_cwd', | |
224 | getcwd => '_vms_cwd', | |
225 | fastcwd => '_vms_cwd', | |
226 | fastgetcwd => '_vms_cwd', | |
227 | abs_path => '_vms_abs_path', | |
228 | fast_abs_path => '_vms_abs_path', | |
229 | }, | |
230 | ||
231 | MSWin32 => | |
232 | { | |
233 | # We assume that &_NT_cwd is defined as an XSUB or in the core. | |
234 | cwd => '_NT_cwd', | |
235 | getcwd => '_NT_cwd', | |
236 | fastcwd => '_NT_cwd', | |
237 | fastgetcwd => '_NT_cwd', | |
238 | abs_path => 'fast_abs_path', | |
239 | realpath => 'fast_abs_path', | |
240 | }, | |
241 | ||
242 | dos => | |
243 | { | |
244 | cwd => '_dos_cwd', | |
245 | getcwd => '_dos_cwd', | |
246 | fastgetcwd => '_dos_cwd', | |
247 | fastcwd => '_dos_cwd', | |
248 | abs_path => 'fast_abs_path', | |
249 | }, | |
250 | ||
251 | qnx => | |
252 | { | |
253 | cwd => '_qnx_cwd', | |
254 | getcwd => '_qnx_cwd', | |
255 | fastgetcwd => '_qnx_cwd', | |
256 | fastcwd => '_qnx_cwd', | |
257 | abs_path => '_qnx_abs_path', | |
258 | fast_abs_path => '_qnx_abs_path', | |
259 | }, | |
260 | ||
261 | cygwin => | |
262 | { | |
263 | getcwd => 'cwd', | |
264 | fastgetcwd => 'cwd', | |
265 | fastcwd => 'cwd', | |
266 | abs_path => 'fast_abs_path', | |
267 | realpath => 'fast_abs_path', | |
268 | }, | |
269 | ||
270 | epoc => | |
271 | { | |
272 | cwd => '_epoc_cwd', | |
273 | getcwd => '_epoc_cwd', | |
274 | fastgetcwd => '_epoc_cwd', | |
275 | fastcwd => '_epoc_cwd', | |
276 | abs_path => 'fast_abs_path', | |
277 | }, | |
278 | ||
279 | MacOS => | |
280 | { | |
281 | getcwd => 'cwd', | |
282 | fastgetcwd => 'cwd', | |
283 | fastcwd => 'cwd', | |
284 | abs_path => 'fast_abs_path', | |
285 | }, | |
286 | ); | |
287 | ||
288 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; | |
289 | $METHOD_MAP{nto} = $METHOD_MAP{qnx}; | |
290 | ||
96e4d5b1 | 291 | |
3547aa9a MS |
292 | # Find the pwd command in the expected locations. We assume these |
293 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} | |
294 | # so everything works under taint mode. | |
295 | my $pwd_cmd; | |
889f7a4f RGS |
296 | foreach my $try ('/bin/pwd', |
297 | '/usr/bin/pwd', | |
298 | '/QOpenSys/bin/pwd', # OS/400 PASE. | |
299 | ) { | |
300 | ||
3547aa9a MS |
301 | if( -x $try ) { |
302 | $pwd_cmd = $try; | |
303 | last; | |
304 | } | |
305 | } | |
fa52125f | 306 | my $found_pwd_cmd = defined($pwd_cmd); |
522b859a | 307 | unless ($pwd_cmd) { |
889f7a4f RGS |
308 | # Isn't this wrong? _backtick_pwd() will fail if somenone has |
309 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? | |
310 | # See [perl #16774]. --jhi | |
311 | $pwd_cmd = 'pwd'; | |
522b859a | 312 | } |
3547aa9a | 313 | |
a9939470 NC |
314 | # Lazy-load Carp |
315 | sub _carp { require Carp; Carp::carp(@_) } | |
316 | sub _croak { require Carp; Carp::croak(@_) } | |
317 | ||
3547aa9a | 318 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 | 319 | sub _backtick_pwd { |
f6342b4b RGS |
320 | # Localize %ENV entries in a way that won't create new hash keys |
321 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); | |
322 | local @ENV{@localize}; | |
323 | ||
3547aa9a | 324 | my $cwd = `$pwd_cmd`; |
ac3b20cb | 325 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f | 326 | local $/ = "\n"; |
ac3b20cb | 327 | # `pwd` may fail e.g. if the disk is full |
7e03f963 | 328 | chomp($cwd) if defined $cwd; |
4633a7c4 | 329 | $cwd; |
8b88ae92 | 330 | } |
4633a7c4 LW |
331 | |
332 | # Since some ports may predefine cwd internally (e.g., NT) | |
333 | # we take care not to override an existing definition for cwd(). | |
334 | ||
09122b95 | 335 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd | 336 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 | 337 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 | 338 | my $os = $^O; # Protect $^O from tainting |
fa52125f SP |
339 | |
340 | ||
341 | # Try again to find a pwd, this time searching the whole PATH. | |
342 | if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows | |
343 | my @candidates = split($sep, $ENV{PATH}); | |
344 | while (!$found_pwd_cmd and @candidates) { | |
345 | my $candidate = shift @candidates; | |
346 | $found_pwd_cmd = 1 if -x "$candidate/pwd"; | |
347 | } | |
348 | } | |
349 | ||
350 | # MacOS has some special magic to make `pwd` work. | |
351 | if( $os eq 'MacOS' || $found_pwd_cmd ) | |
73b801a6 | 352 | { |
ea54c8bd EC |
353 | *cwd = \&_backtick_pwd; |
354 | } | |
355 | else { | |
356 | *cwd = \&getcwd; | |
357 | } | |
358 | } | |
a0d0e21e | 359 | |
1f4f94f5 RS |
360 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
361 | # isn't redefined later (20001212 rspier) | |
362 | *fastgetcwd = \&cwd; | |
748a9306 | 363 | |
a7a23d71 NC |
364 | # By Brandon S. Allbery |
365 | # | |
366 | # Usage: $cwd = getcwd(); | |
367 | ||
368 | sub _perl_getcwd | |
369 | { | |
370 | abs_path('.'); | |
371 | } | |
372 | ||
a0c9c202 JH |
373 | # By John Bazik |
374 | # | |
375 | # Usage: $cwd = &fastcwd; | |
376 | # | |
377 | # This is a faster version of getcwd. It's also more dangerous because | |
378 | # you might chdir out of a directory that you can't chdir back into. | |
379 | ||
99f36a73 | 380 | sub fastcwd_ { |
a0c9c202 JH |
381 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
382 | my(@path, $path); | |
383 | local(*DIR); | |
384 | ||
385 | my($orig_cdev, $orig_cino) = stat('.'); | |
386 | ($cdev, $cino) = ($orig_cdev, $orig_cino); | |
387 | for (;;) { | |
388 | my $direntry; | |
389 | ($odev, $oino) = ($cdev, $cino); | |
390 | CORE::chdir('..') || return undef; | |
391 | ($cdev, $cino) = stat('.'); | |
392 | last if $odev == $cdev && $oino == $cino; | |
393 | opendir(DIR, '.') || return undef; | |
394 | for (;;) { | |
395 | $direntry = readdir(DIR); | |
396 | last unless defined $direntry; | |
397 | next if $direntry eq '.'; | |
398 | next if $direntry eq '..'; | |
399 | ||
400 | ($tdev, $tino) = lstat($direntry); | |
401 | last unless $tdev != $odev || $tino != $oino; | |
402 | } | |
403 | closedir(DIR); | |
404 | return undef unless defined $direntry; # should never happen | |
405 | unshift(@path, $direntry); | |
406 | } | |
407 | $path = '/' . join('/', @path); | |
408 | if ($^O eq 'apollo') { $path = "/".$path; } | |
409 | # At this point $path may be tainted (if tainting) and chdir would fail. | |
248785eb RGS |
410 | # Untaint it then check that we landed where we started. |
411 | $path =~ /^(.*)\z/s # untaint | |
412 | && CORE::chdir($1) or return undef; | |
a0c9c202 JH |
413 | ($cdev, $cino) = stat('.'); |
414 | die "Unstable directory path, current directory changed unexpectedly" | |
415 | if $cdev != $orig_cdev || $cino != $orig_cino; | |
416 | $path; | |
417 | } | |
99f36a73 | 418 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 JH |
419 | |
420 | ||
4633a7c4 | 421 | # Keeps track of current working directory in PWD environment var |
a0d0e21e LW |
422 | # Usage: |
423 | # use Cwd 'chdir'; | |
424 | # chdir $newdir; | |
425 | ||
4633a7c4 | 426 | my $chdir_init = 0; |
a0d0e21e | 427 | |
4633a7c4 | 428 | sub chdir_init { |
3b8e3443 | 429 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e LW |
430 | my($dd,$di) = stat('.'); |
431 | my($pd,$pi) = stat($ENV{'PWD'}); | |
432 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { | |
4633a7c4 | 433 | $ENV{'PWD'} = cwd(); |
a0d0e21e LW |
434 | } |
435 | } | |
436 | else { | |
3b8e3443 GS |
437 | my $wd = cwd(); |
438 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; | |
439 | $ENV{'PWD'} = $wd; | |
a0d0e21e | 440 | } |
4633a7c4 | 441 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 | 442 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e LW |
443 | my($pd,$pi) = stat($2); |
444 | my($dd,$di) = stat($1); | |
445 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { | |
446 | $ENV{'PWD'}="$2$3"; | |
447 | } | |
448 | } | |
449 | $chdir_init = 1; | |
450 | } | |
451 | ||
452 | sub chdir { | |
22978713 | 453 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
3b8e3443 | 454 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; |
a0d0e21e | 455 | chdir_init() unless $chdir_init; |
4ffa1610 JH |
456 | my $newpwd; |
457 | if ($^O eq 'MSWin32') { | |
458 | # get the full path name *before* the chdir() | |
459 | $newpwd = Win32::GetFullPathName($newdir); | |
460 | } | |
461 | ||
4633a7c4 | 462 | return 0 unless CORE::chdir $newdir; |
4ffa1610 | 463 | |
3b8e3443 GS |
464 | if ($^O eq 'VMS') { |
465 | return $ENV{'PWD'} = $ENV{'DEFAULT'} | |
466 | } | |
4aecb5b5 JH |
467 | elsif ($^O eq 'MacOS') { |
468 | return $ENV{'PWD'} = cwd(); | |
469 | } | |
3b8e3443 | 470 | elsif ($^O eq 'MSWin32') { |
4ffa1610 | 471 | $ENV{'PWD'} = $newpwd; |
3b8e3443 GS |
472 | return 1; |
473 | } | |
748a9306 | 474 | |
392d8ab8 | 475 | if ($newdir =~ m#^/#s) { |
a0d0e21e | 476 | $ENV{'PWD'} = $newdir; |
4633a7c4 LW |
477 | } else { |
478 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
479 | @curdir = ('') unless @curdir; | |
480 | my $component; | |
a0d0e21e LW |
481 | foreach $component (split(m#/#, $newdir)) { |
482 | next if $component eq '.'; | |
483 | pop(@curdir),next if $component eq '..'; | |
484 | push(@curdir,$component); | |
485 | } | |
486 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
487 | } | |
4633a7c4 | 488 | 1; |
a0d0e21e LW |
489 | } |
490 | ||
a0c9c202 | 491 | |
99f36a73 | 492 | sub _perl_abs_path |
a0c9c202 JH |
493 | { |
494 | my $start = @_ ? shift : '.'; | |
495 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
496 | ||
497 | unless (@cst = stat( $start )) | |
498 | { | |
a9939470 | 499 | _carp("stat($start): $!"); |
a0c9c202 JH |
500 | return ''; |
501 | } | |
09122b95 RGS |
502 | |
503 | unless (-d _) { | |
504 | # Make sure we can be invoked on plain files, not just directories. | |
505 | # NOTE that this routine assumes that '/' is the only directory separator. | |
506 | ||
507 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} | |
508 | or return cwd() . '/' . $start; | |
509 | ||
275e8705 RGS |
510 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
511 | if (-l $start) { | |
09122b95 RGS |
512 | my $link_target = readlink($start); |
513 | die "Can't resolve link $start: $!" unless defined $link_target; | |
514 | ||
515 | require File::Spec; | |
516 | $link_target = $dir . '/' . $link_target | |
517 | unless File::Spec->file_name_is_absolute($link_target); | |
518 | ||
519 | return abs_path($link_target); | |
520 | } | |
521 | ||
99f36a73 | 522 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 RGS |
523 | } |
524 | ||
a0c9c202 JH |
525 | $cwd = ''; |
526 | $dotdots = $start; | |
527 | do | |
528 | { | |
529 | $dotdots .= '/..'; | |
530 | @pst = @cst; | |
a25ef67d | 531 | local *PARENT; |
a0c9c202 JH |
532 | unless (opendir(PARENT, $dotdots)) |
533 | { | |
a9939470 | 534 | _carp("opendir($dotdots): $!"); |
a0c9c202 JH |
535 | return ''; |
536 | } | |
537 | unless (@cst = stat($dotdots)) | |
538 | { | |
a9939470 | 539 | _carp("stat($dotdots): $!"); |
a0c9c202 JH |
540 | closedir(PARENT); |
541 | return ''; | |
542 | } | |
543 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) | |
544 | { | |
545 | $dir = undef; | |
546 | } | |
547 | else | |
548 | { | |
549 | do | |
550 | { | |
551 | unless (defined ($dir = readdir(PARENT))) | |
552 | { | |
a9939470 | 553 | _carp("readdir($dotdots): $!"); |
a0c9c202 JH |
554 | closedir(PARENT); |
555 | return ''; | |
556 | } | |
557 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) | |
558 | } | |
559 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || | |
560 | $tst[1] != $pst[1]); | |
561 | } | |
562 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; | |
563 | closedir(PARENT); | |
564 | } while (defined $dir); | |
565 | chop($cwd) unless $cwd eq '/'; # drop the trailing / | |
566 | $cwd; | |
567 | } | |
568 | ||
569 | ||
3ee63918 | 570 | my $Curdir; |
96e4d5b1 | 571 | sub fast_abs_path { |
99f36a73 | 572 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 | 573 | my $cwd = getcwd(); |
4d6b4052 | 574 | require File::Spec; |
3ee63918 MS |
575 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
576 | ||
577 | # Detaint else we'll explode in taint mode. This is safe because | |
578 | # we're not doing anything dangerous with it. | |
579 | ($path) = $path =~ /(.*)/; | |
580 | ($cwd) = $cwd =~ /(.*)/; | |
581 | ||
09122b95 RGS |
582 | unless (-e $path) { |
583 | _croak("$path: No such file or directory"); | |
584 | } | |
585 | ||
586 | unless (-d _) { | |
587 | # Make sure we can be invoked on plain files, not just directories. | |
588 | ||
589 | my ($vol, $dir, $file) = File::Spec->splitpath($path); | |
590 | return File::Spec->catfile($cwd, $path) unless length $dir; | |
591 | ||
592 | if (-l $path) { | |
593 | my $link_target = readlink($path); | |
594 | die "Can't resolve link $path: $!" unless defined $link_target; | |
595 | ||
596 | $link_target = File::Spec->catpath($vol, $dir, $link_target) | |
597 | unless File::Spec->file_name_is_absolute($link_target); | |
598 | ||
599 | return fast_abs_path($link_target); | |
600 | } | |
601 | ||
d6802e43 | 602 | return $dir eq File::Spec->rootdir |
99f36a73 RGS |
603 | ? File::Spec->catpath($vol, $dir, $file) |
604 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; | |
09122b95 RGS |
605 | } |
606 | ||
e2ba406b | 607 | if (!CORE::chdir($path)) { |
a9939470 | 608 | _croak("Cannot chdir to $path: $!"); |
e2ba406b | 609 | } |
96e4d5b1 | 610 | my $realpath = getcwd(); |
e2ba406b | 611 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 | 612 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b | 613 | } |
96e4d5b1 | 614 | $realpath; |
8b88ae92 NIS |
615 | } |
616 | ||
e4c51978 GS |
617 | # added function alias to follow principle of least surprise |
618 | # based on previous aliasing. --tchrist 27-Jan-00 | |
619 | *fast_realpath = \&fast_abs_path; | |
620 | ||
4633a7c4 LW |
621 | |
622 | # --- PORTING SECTION --- | |
623 | ||
624 | # VMS: $ENV{'DEFAULT'} points to default directory at all times | |
bd3fa61c | 625 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 | 626 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 NIS |
627 | # in the process logical name table as the default device and directory |
628 | # seen by Perl. This may not be the same as the default device | |
4633a7c4 LW |
629 | # and directory seen by DCL after Perl exits, since the effects |
630 | # the CRTL chdir() function persist only until Perl exits. | |
4633a7c4 LW |
631 | |
632 | sub _vms_cwd { | |
96e4d5b1 | 633 | return $ENV{'DEFAULT'}; |
634 | } | |
635 | ||
636 | sub _vms_abs_path { | |
637 | return $ENV{'DEFAULT'} unless @_; | |
9d7d9729 CB |
638 | |
639 | # may need to turn foo.dir into [.foo] | |
96e4d5b1 | 640 | my $path = VMS::Filespec::pathify($_[0]); |
9d7d9729 CB |
641 | $path = $_[0] unless defined $path; |
642 | ||
96e4d5b1 | 643 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 | 644 | } |
68dc0745 | 645 | |
4633a7c4 LW |
646 | sub _os2_cwd { |
647 | $ENV{'PWD'} = `cmd /c cd`; | |
39741d73 | 648 | chomp $ENV{'PWD'}; |
aa6b7957 | 649 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 LW |
650 | return $ENV{'PWD'}; |
651 | } | |
652 | ||
96e4d5b1 | 653 | sub _win32_cwd { |
2d7a9237 | 654 | $ENV{'PWD'} = Win32::GetCwd(); |
aa6b7957 | 655 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 | 656 | return $ENV{'PWD'}; |
657 | } | |
658 | ||
f6342b4b | 659 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd; |
68dc0745 | 660 | |
39e571d4 LM |
661 | sub _dos_cwd { |
662 | if (!defined &Dos::GetCwd) { | |
663 | $ENV{'PWD'} = `command /c cd`; | |
39741d73 | 664 | chomp $ENV{'PWD'}; |
aa6b7957 | 665 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 LM |
666 | } else { |
667 | $ENV{'PWD'} = Dos::GetCwd(); | |
668 | } | |
55497cff | 669 | return $ENV{'PWD'}; |
670 | } | |
671 | ||
7fbf1995 | 672 | sub _qnx_cwd { |
35b807ef NA |
673 | local $ENV{PATH} = ''; |
674 | local $ENV{CDPATH} = ''; | |
675 | local $ENV{ENV} = ''; | |
7fbf1995 | 676 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 | 677 | chomp $ENV{'PWD'}; |
7fbf1995 NA |
678 | return $ENV{'PWD'}; |
679 | } | |
680 | ||
681 | sub _qnx_abs_path { | |
35b807ef NA |
682 | local $ENV{PATH} = ''; |
683 | local $ENV{CDPATH} = ''; | |
684 | local $ENV{ENV} = ''; | |
fa921dc6 | 685 | my $path = @_ ? shift : '.'; |
39741d73 MS |
686 | local *REALPATH; |
687 | ||
99f36a73 | 688 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 MS |
689 | die "Can't open /usr/bin/fullpath: $!"; |
690 | my $realpath = <REALPATH>; | |
691 | close REALPATH; | |
692 | chomp $realpath; | |
7fbf1995 NA |
693 | return $realpath; |
694 | } | |
695 | ||
ed79a026 OF |
696 | sub _epoc_cwd { |
697 | $ENV{'PWD'} = EPOC::getcwd(); | |
698 | return $ENV{'PWD'}; | |
699 | } | |
700 | ||
4633a7c4 | 701 | |
09122b95 RGS |
702 | # Now that all the base-level functions are set up, alias the |
703 | # user-level functions to the right places | |
704 | ||
705 | if (exists $METHOD_MAP{$^O}) { | |
706 | my $map = $METHOD_MAP{$^O}; | |
707 | foreach my $name (keys %$map) { | |
99f36a73 | 708 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 RGS |
709 | no strict 'refs'; |
710 | *{$name} = \&{$map->{$name}}; | |
711 | } | |
55497cff | 712 | } |
4633a7c4 | 713 | |
99f36a73 RGS |
714 | # In case the XS version doesn't load. |
715 | *abs_path = \&_perl_abs_path unless defined &abs_path; | |
a7a23d71 | 716 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 RGS |
717 | |
718 | # added function alias for those of us more | |
719 | # used to the libc function. --tchrist 27-Jan-00 | |
720 | *realpath = \&abs_path; | |
4633a7c4 | 721 | |
a0d0e21e | 722 | 1; |