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1 | package Cwd; |
a0d0e21e |
2 | |
f06db76b |
3 | =head1 NAME |
4 | |
902bacac |
5 | Cwd - get pathname of current working directory |
f06db76b |
6 | |
7 | =head1 SYNOPSIS |
8 | |
4633a7c4 |
9 | use Cwd; |
04929354 |
10 | my $dir = getcwd; |
4633a7c4 |
11 | |
04929354 |
12 | use Cwd 'abs_path'; |
13 | my $abs_path = abs_path($file); |
f06db76b |
14 | |
04929354 |
15 | =head1 DESCRIPTION |
902bacac |
16 | |
04929354 |
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 |
27 | Each of these functions are called without arguments and return the |
28 | absolute path of the current working directory. |
f06db76b |
29 | |
04929354 |
30 | =over 4 |
31 | |
32 | =item getcwd |
33 | |
34 | my $cwd = getcwd(); |
35 | |
36 | Returns the current working directory. |
37 | |
fa52125f |
38 | Exposes the POSIX function getcwd(3) or re-implements it if it's not |
39 | available. |
04929354 |
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 |
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 |
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 |
82 | =back |
83 | |
902bacac |
84 | |
04929354 |
85 | =head2 abs_path and friends |
86 | |
87 | These functions are exported only on request. They each take a single |
3ee63918 |
88 | argument and return the absolute pathname for it. If no argument is |
89 | given they'll use the current working directory. |
04929354 |
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 |
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 |
126 | =head1 NOTES |
127 | |
128 | =over 4 |
129 | |
130 | =item * |
131 | |
04929354 |
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 |
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 |
145 | =head1 AUTHOR |
146 | |
147 | Originally by the perl5-porters. |
148 | |
78321866 |
149 | Maintained by Ken Williams <KWILLIAMS@cpan.org> |
02cc4877 |
150 | |
99f36a73 |
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 |
164 | =head1 SEE ALSO |
165 | |
166 | L<File::chdir> |
167 | |
f06db76b |
168 | =cut |
169 | |
b060a406 |
170 | use strict; |
a9939470 |
171 | use Exporter; |
99f36a73 |
172 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); |
173 | |
21887892 |
174 | $VERSION = '3.29'; |
4a4ab19c |
175 | my $xs_version = $VERSION; |
486bcc50 |
176 | $VERSION = eval $VERSION; |
96e4d5b1 |
177 | |
a9939470 |
178 | @ISA = qw/ Exporter /; |
179 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); |
09122b95 |
180 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 |
181 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e |
182 | |
f5f423e4 |
183 | # sys_cwd may keep the builtin command |
184 | |
185 | # All the functionality of this module may provided by builtins, |
186 | # there is no sense to process the rest of the file. |
187 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? |
188 | |
a9939470 |
189 | if ($^O eq 'os2') { |
f5f423e4 |
190 | local $^W = 0; |
a9939470 |
191 | |
192 | *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; |
193 | *getcwd = \&cwd; |
194 | *fastgetcwd = \&cwd; |
195 | *fastcwd = \&cwd; |
196 | |
197 | *fast_abs_path = \&sys_abspath if defined &sys_abspath; |
198 | *abs_path = \&fast_abs_path; |
199 | *realpath = \&fast_abs_path; |
200 | *fast_realpath = \&fast_abs_path; |
201 | |
f5f423e4 |
202 | return 1; |
203 | } |
204 | |
b04f6d36 |
205 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
f22d8e4b |
206 | eval { |
b04f6d36 |
207 | if ( $] >= 5.006 ) { |
208 | require XSLoader; |
4a4ab19c |
209 | XSLoader::load( __PACKAGE__, $xs_version); |
b04f6d36 |
210 | } else { |
211 | require DynaLoader; |
212 | push @ISA, 'DynaLoader'; |
4a4ab19c |
213 | __PACKAGE__->bootstrap( $xs_version ); |
b04f6d36 |
214 | } |
f22d8e4b |
215 | }; |
4633a7c4 |
216 | |
99f36a73 |
217 | # Must be after the DynaLoader stuff: |
218 | $VERSION = eval $VERSION; |
219 | |
09122b95 |
220 | # Big nasty table of function aliases |
221 | my %METHOD_MAP = |
222 | ( |
223 | VMS => |
224 | { |
225 | cwd => '_vms_cwd', |
226 | getcwd => '_vms_cwd', |
227 | fastcwd => '_vms_cwd', |
228 | fastgetcwd => '_vms_cwd', |
229 | abs_path => '_vms_abs_path', |
230 | fast_abs_path => '_vms_abs_path', |
231 | }, |
232 | |
233 | MSWin32 => |
234 | { |
235 | # We assume that &_NT_cwd is defined as an XSUB or in the core. |
236 | cwd => '_NT_cwd', |
237 | getcwd => '_NT_cwd', |
238 | fastcwd => '_NT_cwd', |
239 | fastgetcwd => '_NT_cwd', |
240 | abs_path => 'fast_abs_path', |
241 | realpath => 'fast_abs_path', |
242 | }, |
243 | |
244 | dos => |
245 | { |
246 | cwd => '_dos_cwd', |
247 | getcwd => '_dos_cwd', |
248 | fastgetcwd => '_dos_cwd', |
249 | fastcwd => '_dos_cwd', |
250 | abs_path => 'fast_abs_path', |
251 | }, |
252 | |
253 | qnx => |
254 | { |
255 | cwd => '_qnx_cwd', |
256 | getcwd => '_qnx_cwd', |
257 | fastgetcwd => '_qnx_cwd', |
258 | fastcwd => '_qnx_cwd', |
259 | abs_path => '_qnx_abs_path', |
260 | fast_abs_path => '_qnx_abs_path', |
261 | }, |
262 | |
263 | cygwin => |
264 | { |
265 | getcwd => 'cwd', |
266 | fastgetcwd => 'cwd', |
267 | fastcwd => 'cwd', |
268 | abs_path => 'fast_abs_path', |
269 | realpath => 'fast_abs_path', |
270 | }, |
271 | |
272 | epoc => |
273 | { |
274 | cwd => '_epoc_cwd', |
275 | getcwd => '_epoc_cwd', |
276 | fastgetcwd => '_epoc_cwd', |
277 | fastcwd => '_epoc_cwd', |
278 | abs_path => 'fast_abs_path', |
279 | }, |
280 | |
281 | MacOS => |
282 | { |
283 | getcwd => 'cwd', |
284 | fastgetcwd => 'cwd', |
285 | fastcwd => 'cwd', |
286 | abs_path => 'fast_abs_path', |
287 | }, |
288 | ); |
289 | |
290 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; |
291 | $METHOD_MAP{nto} = $METHOD_MAP{qnx}; |
292 | |
96e4d5b1 |
293 | |
3547aa9a |
294 | # Find the pwd command in the expected locations. We assume these |
295 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} |
296 | # so everything works under taint mode. |
297 | my $pwd_cmd; |
889f7a4f |
298 | foreach my $try ('/bin/pwd', |
299 | '/usr/bin/pwd', |
300 | '/QOpenSys/bin/pwd', # OS/400 PASE. |
301 | ) { |
302 | |
3547aa9a |
303 | if( -x $try ) { |
304 | $pwd_cmd = $try; |
305 | last; |
306 | } |
307 | } |
fa52125f |
308 | my $found_pwd_cmd = defined($pwd_cmd); |
522b859a |
309 | unless ($pwd_cmd) { |
889f7a4f |
310 | # Isn't this wrong? _backtick_pwd() will fail if somenone has |
311 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? |
312 | # See [perl #16774]. --jhi |
313 | $pwd_cmd = 'pwd'; |
522b859a |
314 | } |
3547aa9a |
315 | |
a9939470 |
316 | # Lazy-load Carp |
317 | sub _carp { require Carp; Carp::carp(@_) } |
318 | sub _croak { require Carp; Carp::croak(@_) } |
319 | |
3547aa9a |
320 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 |
321 | sub _backtick_pwd { |
f6342b4b |
322 | # Localize %ENV entries in a way that won't create new hash keys |
323 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); |
324 | local @ENV{@localize}; |
325 | |
3547aa9a |
326 | my $cwd = `$pwd_cmd`; |
ac3b20cb |
327 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f |
328 | local $/ = "\n"; |
ac3b20cb |
329 | # `pwd` may fail e.g. if the disk is full |
7e03f963 |
330 | chomp($cwd) if defined $cwd; |
4633a7c4 |
331 | $cwd; |
8b88ae92 |
332 | } |
4633a7c4 |
333 | |
334 | # Since some ports may predefine cwd internally (e.g., NT) |
335 | # we take care not to override an existing definition for cwd(). |
336 | |
09122b95 |
337 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd |
338 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 |
339 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 |
340 | my $os = $^O; # Protect $^O from tainting |
fa52125f |
341 | |
342 | |
343 | # Try again to find a pwd, this time searching the whole PATH. |
344 | if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows |
345 | my @candidates = split($sep, $ENV{PATH}); |
346 | while (!$found_pwd_cmd and @candidates) { |
347 | my $candidate = shift @candidates; |
348 | $found_pwd_cmd = 1 if -x "$candidate/pwd"; |
349 | } |
350 | } |
351 | |
352 | # MacOS has some special magic to make `pwd` work. |
353 | if( $os eq 'MacOS' || $found_pwd_cmd ) |
73b801a6 |
354 | { |
ea54c8bd |
355 | *cwd = \&_backtick_pwd; |
356 | } |
357 | else { |
358 | *cwd = \&getcwd; |
359 | } |
360 | } |
a0d0e21e |
361 | |
23bb49fa |
362 | if ($^O eq 'cygwin') { |
363 | # We need to make sure cwd() is called with no args, because it's |
364 | # got an arg-less prototype and will die if args are present. |
365 | local $^W = 0; |
366 | my $orig_cwd = \&cwd; |
367 | *cwd = sub { &$orig_cwd() } |
368 | } |
369 | |
370 | |
1f4f94f5 |
371 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
372 | # isn't redefined later (20001212 rspier) |
373 | *fastgetcwd = \&cwd; |
748a9306 |
374 | |
c47834cd |
375 | # A non-XS version of getcwd() - also used to bootstrap the perl build |
376 | # process, when miniperl is running and no XS loading happens. |
a7a23d71 |
377 | sub _perl_getcwd |
378 | { |
379 | abs_path('.'); |
380 | } |
381 | |
a0c9c202 |
382 | # By John Bazik |
383 | # |
384 | # Usage: $cwd = &fastcwd; |
385 | # |
386 | # This is a faster version of getcwd. It's also more dangerous because |
387 | # you might chdir out of a directory that you can't chdir back into. |
388 | |
99f36a73 |
389 | sub fastcwd_ { |
a0c9c202 |
390 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
391 | my(@path, $path); |
392 | local(*DIR); |
393 | |
394 | my($orig_cdev, $orig_cino) = stat('.'); |
395 | ($cdev, $cino) = ($orig_cdev, $orig_cino); |
396 | for (;;) { |
397 | my $direntry; |
398 | ($odev, $oino) = ($cdev, $cino); |
399 | CORE::chdir('..') || return undef; |
400 | ($cdev, $cino) = stat('.'); |
401 | last if $odev == $cdev && $oino == $cino; |
402 | opendir(DIR, '.') || return undef; |
403 | for (;;) { |
404 | $direntry = readdir(DIR); |
405 | last unless defined $direntry; |
406 | next if $direntry eq '.'; |
407 | next if $direntry eq '..'; |
408 | |
409 | ($tdev, $tino) = lstat($direntry); |
410 | last unless $tdev != $odev || $tino != $oino; |
411 | } |
412 | closedir(DIR); |
413 | return undef unless defined $direntry; # should never happen |
414 | unshift(@path, $direntry); |
415 | } |
416 | $path = '/' . join('/', @path); |
417 | if ($^O eq 'apollo') { $path = "/".$path; } |
418 | # At this point $path may be tainted (if tainting) and chdir would fail. |
248785eb |
419 | # Untaint it then check that we landed where we started. |
420 | $path =~ /^(.*)\z/s # untaint |
421 | && CORE::chdir($1) or return undef; |
a0c9c202 |
422 | ($cdev, $cino) = stat('.'); |
423 | die "Unstable directory path, current directory changed unexpectedly" |
424 | if $cdev != $orig_cdev || $cino != $orig_cino; |
425 | $path; |
426 | } |
99f36a73 |
427 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 |
428 | |
429 | |
4633a7c4 |
430 | # Keeps track of current working directory in PWD environment var |
a0d0e21e |
431 | # Usage: |
432 | # use Cwd 'chdir'; |
433 | # chdir $newdir; |
434 | |
4633a7c4 |
435 | my $chdir_init = 0; |
a0d0e21e |
436 | |
4633a7c4 |
437 | sub chdir_init { |
3b8e3443 |
438 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e |
439 | my($dd,$di) = stat('.'); |
440 | my($pd,$pi) = stat($ENV{'PWD'}); |
441 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { |
4633a7c4 |
442 | $ENV{'PWD'} = cwd(); |
a0d0e21e |
443 | } |
444 | } |
445 | else { |
3b8e3443 |
446 | my $wd = cwd(); |
447 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; |
448 | $ENV{'PWD'} = $wd; |
a0d0e21e |
449 | } |
4633a7c4 |
450 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 |
451 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e |
452 | my($pd,$pi) = stat($2); |
453 | my($dd,$di) = stat($1); |
454 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { |
455 | $ENV{'PWD'}="$2$3"; |
456 | } |
457 | } |
458 | $chdir_init = 1; |
459 | } |
460 | |
461 | sub chdir { |
22978713 |
462 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
3b8e3443 |
463 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; |
a0d0e21e |
464 | chdir_init() unless $chdir_init; |
4ffa1610 |
465 | my $newpwd; |
466 | if ($^O eq 'MSWin32') { |
467 | # get the full path name *before* the chdir() |
468 | $newpwd = Win32::GetFullPathName($newdir); |
469 | } |
470 | |
4633a7c4 |
471 | return 0 unless CORE::chdir $newdir; |
4ffa1610 |
472 | |
3b8e3443 |
473 | if ($^O eq 'VMS') { |
474 | return $ENV{'PWD'} = $ENV{'DEFAULT'} |
475 | } |
4aecb5b5 |
476 | elsif ($^O eq 'MacOS') { |
477 | return $ENV{'PWD'} = cwd(); |
478 | } |
3b8e3443 |
479 | elsif ($^O eq 'MSWin32') { |
4ffa1610 |
480 | $ENV{'PWD'} = $newpwd; |
3b8e3443 |
481 | return 1; |
482 | } |
748a9306 |
483 | |
e9475de8 |
484 | if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in |
485 | $ENV{'PWD'} = cwd(); |
486 | } elsif ($newdir =~ m#^/#s) { |
a0d0e21e |
487 | $ENV{'PWD'} = $newdir; |
4633a7c4 |
488 | } else { |
489 | my @curdir = split(m#/#,$ENV{'PWD'}); |
490 | @curdir = ('') unless @curdir; |
491 | my $component; |
a0d0e21e |
492 | foreach $component (split(m#/#, $newdir)) { |
493 | next if $component eq '.'; |
494 | pop(@curdir),next if $component eq '..'; |
495 | push(@curdir,$component); |
496 | } |
497 | $ENV{'PWD'} = join('/',@curdir) || '/'; |
498 | } |
4633a7c4 |
499 | 1; |
a0d0e21e |
500 | } |
501 | |
a0c9c202 |
502 | |
99f36a73 |
503 | sub _perl_abs_path |
a0c9c202 |
504 | { |
505 | my $start = @_ ? shift : '.'; |
506 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); |
507 | |
508 | unless (@cst = stat( $start )) |
509 | { |
a9939470 |
510 | _carp("stat($start): $!"); |
a0c9c202 |
511 | return ''; |
512 | } |
09122b95 |
513 | |
514 | unless (-d _) { |
515 | # Make sure we can be invoked on plain files, not just directories. |
516 | # NOTE that this routine assumes that '/' is the only directory separator. |
517 | |
518 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} |
519 | or return cwd() . '/' . $start; |
520 | |
275e8705 |
521 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
522 | if (-l $start) { |
09122b95 |
523 | my $link_target = readlink($start); |
524 | die "Can't resolve link $start: $!" unless defined $link_target; |
525 | |
526 | require File::Spec; |
527 | $link_target = $dir . '/' . $link_target |
528 | unless File::Spec->file_name_is_absolute($link_target); |
529 | |
530 | return abs_path($link_target); |
531 | } |
532 | |
99f36a73 |
533 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 |
534 | } |
535 | |
a0c9c202 |
536 | $cwd = ''; |
537 | $dotdots = $start; |
538 | do |
539 | { |
540 | $dotdots .= '/..'; |
541 | @pst = @cst; |
a25ef67d |
542 | local *PARENT; |
a0c9c202 |
543 | unless (opendir(PARENT, $dotdots)) |
544 | { |
bf7c0a3d |
545 | # probably a permissions issue. Try the native command. |
546 | return File::Spec->rel2abs( $start, _backtick_pwd() ); |
a0c9c202 |
547 | } |
548 | unless (@cst = stat($dotdots)) |
549 | { |
a9939470 |
550 | _carp("stat($dotdots): $!"); |
a0c9c202 |
551 | closedir(PARENT); |
552 | return ''; |
553 | } |
554 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) |
555 | { |
556 | $dir = undef; |
557 | } |
558 | else |
559 | { |
560 | do |
561 | { |
562 | unless (defined ($dir = readdir(PARENT))) |
563 | { |
a9939470 |
564 | _carp("readdir($dotdots): $!"); |
a0c9c202 |
565 | closedir(PARENT); |
566 | return ''; |
567 | } |
568 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) |
569 | } |
570 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || |
571 | $tst[1] != $pst[1]); |
572 | } |
573 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; |
574 | closedir(PARENT); |
575 | } while (defined $dir); |
576 | chop($cwd) unless $cwd eq '/'; # drop the trailing / |
577 | $cwd; |
578 | } |
579 | |
580 | |
3ee63918 |
581 | my $Curdir; |
96e4d5b1 |
582 | sub fast_abs_path { |
99f36a73 |
583 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 |
584 | my $cwd = getcwd(); |
4d6b4052 |
585 | require File::Spec; |
3ee63918 |
586 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
587 | |
588 | # Detaint else we'll explode in taint mode. This is safe because |
589 | # we're not doing anything dangerous with it. |
590 | ($path) = $path =~ /(.*)/; |
591 | ($cwd) = $cwd =~ /(.*)/; |
592 | |
09122b95 |
593 | unless (-e $path) { |
594 | _croak("$path: No such file or directory"); |
595 | } |
596 | |
597 | unless (-d _) { |
598 | # Make sure we can be invoked on plain files, not just directories. |
599 | |
600 | my ($vol, $dir, $file) = File::Spec->splitpath($path); |
601 | return File::Spec->catfile($cwd, $path) unless length $dir; |
602 | |
603 | if (-l $path) { |
604 | my $link_target = readlink($path); |
605 | die "Can't resolve link $path: $!" unless defined $link_target; |
606 | |
607 | $link_target = File::Spec->catpath($vol, $dir, $link_target) |
608 | unless File::Spec->file_name_is_absolute($link_target); |
609 | |
610 | return fast_abs_path($link_target); |
611 | } |
612 | |
d6802e43 |
613 | return $dir eq File::Spec->rootdir |
99f36a73 |
614 | ? File::Spec->catpath($vol, $dir, $file) |
615 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; |
09122b95 |
616 | } |
617 | |
e2ba406b |
618 | if (!CORE::chdir($path)) { |
a9939470 |
619 | _croak("Cannot chdir to $path: $!"); |
e2ba406b |
620 | } |
96e4d5b1 |
621 | my $realpath = getcwd(); |
e2ba406b |
622 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 |
623 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b |
624 | } |
96e4d5b1 |
625 | $realpath; |
8b88ae92 |
626 | } |
627 | |
e4c51978 |
628 | # added function alias to follow principle of least surprise |
629 | # based on previous aliasing. --tchrist 27-Jan-00 |
630 | *fast_realpath = \&fast_abs_path; |
631 | |
4633a7c4 |
632 | |
633 | # --- PORTING SECTION --- |
634 | |
635 | # VMS: $ENV{'DEFAULT'} points to default directory at all times |
bd3fa61c |
636 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 |
637 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 |
638 | # in the process logical name table as the default device and directory |
639 | # seen by Perl. This may not be the same as the default device |
4633a7c4 |
640 | # and directory seen by DCL after Perl exits, since the effects |
641 | # the CRTL chdir() function persist only until Perl exits. |
4633a7c4 |
642 | |
643 | sub _vms_cwd { |
96e4d5b1 |
644 | return $ENV{'DEFAULT'}; |
645 | } |
646 | |
647 | sub _vms_abs_path { |
648 | return $ENV{'DEFAULT'} unless @_; |
61729915 |
649 | my $path = shift; |
9d7d9729 |
650 | |
61729915 |
651 | if (-l $path) { |
652 | my $link_target = readlink($path); |
653 | die "Can't resolve link $path: $!" unless defined $link_target; |
654 | |
655 | return _vms_abs_path($link_target); |
656 | } |
9d7d9729 |
657 | |
bf7c0a3d |
658 | if (defined &VMS::Filespec::vms_realpath) { |
659 | my $path = $_[0]; |
660 | if ($path =~ m#(?<=\^)/# ) { |
661 | # Unix format |
662 | return VMS::Filespec::vms_realpath($path); |
663 | } |
664 | |
665 | # VMS format |
666 | |
667 | my $new_path = VMS::Filespec::vms_realname($path); |
668 | |
669 | # Perl expects directories to be in directory format |
670 | $new_path = VMS::Filespec::pathify($new_path) if -d $path; |
671 | return $new_path; |
672 | } |
673 | |
674 | # Fallback to older algorithm if correct ones are not |
675 | # available. |
676 | |
61729915 |
677 | # may need to turn foo.dir into [.foo] |
678 | my $pathified = VMS::Filespec::pathify($path); |
679 | $path = $pathified if defined $pathified; |
680 | |
96e4d5b1 |
681 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 |
682 | } |
68dc0745 |
683 | |
4633a7c4 |
684 | sub _os2_cwd { |
685 | $ENV{'PWD'} = `cmd /c cd`; |
39741d73 |
686 | chomp $ENV{'PWD'}; |
aa6b7957 |
687 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 |
688 | return $ENV{'PWD'}; |
689 | } |
690 | |
96e4d5b1 |
691 | sub _win32_cwd { |
cf2f24a4 |
692 | if (defined &DynaLoader::boot_DynaLoader) { |
693 | $ENV{'PWD'} = Win32::GetCwd(); |
694 | } |
695 | else { # miniperl |
696 | chomp($ENV{'PWD'} = `cd`); |
697 | } |
aa6b7957 |
698 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 |
699 | return $ENV{'PWD'}; |
700 | } |
701 | |
f6342b4b |
702 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd; |
68dc0745 |
703 | |
39e571d4 |
704 | sub _dos_cwd { |
705 | if (!defined &Dos::GetCwd) { |
706 | $ENV{'PWD'} = `command /c cd`; |
39741d73 |
707 | chomp $ENV{'PWD'}; |
aa6b7957 |
708 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 |
709 | } else { |
710 | $ENV{'PWD'} = Dos::GetCwd(); |
711 | } |
55497cff |
712 | return $ENV{'PWD'}; |
713 | } |
714 | |
7fbf1995 |
715 | sub _qnx_cwd { |
35b807ef |
716 | local $ENV{PATH} = ''; |
717 | local $ENV{CDPATH} = ''; |
718 | local $ENV{ENV} = ''; |
7fbf1995 |
719 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 |
720 | chomp $ENV{'PWD'}; |
7fbf1995 |
721 | return $ENV{'PWD'}; |
722 | } |
723 | |
724 | sub _qnx_abs_path { |
35b807ef |
725 | local $ENV{PATH} = ''; |
726 | local $ENV{CDPATH} = ''; |
727 | local $ENV{ENV} = ''; |
fa921dc6 |
728 | my $path = @_ ? shift : '.'; |
39741d73 |
729 | local *REALPATH; |
730 | |
99f36a73 |
731 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 |
732 | die "Can't open /usr/bin/fullpath: $!"; |
733 | my $realpath = <REALPATH>; |
734 | close REALPATH; |
735 | chomp $realpath; |
7fbf1995 |
736 | return $realpath; |
737 | } |
738 | |
ed79a026 |
739 | sub _epoc_cwd { |
740 | $ENV{'PWD'} = EPOC::getcwd(); |
741 | return $ENV{'PWD'}; |
742 | } |
743 | |
4633a7c4 |
744 | |
09122b95 |
745 | # Now that all the base-level functions are set up, alias the |
746 | # user-level functions to the right places |
747 | |
748 | if (exists $METHOD_MAP{$^O}) { |
749 | my $map = $METHOD_MAP{$^O}; |
750 | foreach my $name (keys %$map) { |
99f36a73 |
751 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 |
752 | no strict 'refs'; |
753 | *{$name} = \&{$map->{$name}}; |
754 | } |
55497cff |
755 | } |
4633a7c4 |
756 | |
99f36a73 |
757 | # In case the XS version doesn't load. |
758 | *abs_path = \&_perl_abs_path unless defined &abs_path; |
a7a23d71 |
759 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 |
760 | |
761 | # added function alias for those of us more |
762 | # used to the libc function. --tchrist 27-Jan-00 |
763 | *realpath = \&abs_path; |
4633a7c4 |
764 | |
a0d0e21e |
765 | 1; |