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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 | |
38 | Re-implements the getcwd(3) (or getwd(3)) functions in Perl. |
39 | |
40 | =item cwd |
41 | |
42 | my $cwd = cwd(); |
43 | |
44 | The cwd() is the most natural form for the current architecture. For |
45 | most systems it is identical to `pwd` (but without the trailing line |
46 | terminator). |
47 | |
04929354 |
48 | =item fastcwd |
49 | |
50 | my $cwd = fastcwd(); |
51 | |
52 | A more dangerous version of getcwd(), but potentially faster. |
53 | |
54 | It might conceivably chdir() you out of a directory that it can't |
55 | chdir() you back into. If fastcwd encounters a problem it will return |
56 | undef but will probably leave you in a different directory. For a |
57 | measure of extra security, if everything appears to have worked, the |
58 | fastcwd() function will check that it leaves you in the same directory |
59 | that it started in. If it has changed it will C<die> with the message |
60 | "Unstable directory path, current directory changed |
61 | unexpectedly". That should never happen. |
62 | |
63 | =item fastgetcwd |
64 | |
65 | my $cwd = fastgetcwd(); |
f06db76b |
66 | |
902bacac |
67 | The fastgetcwd() function is provided as a synonym for cwd(). |
fb73857a |
68 | |
09122b95 |
69 | =item getdcwd |
70 | |
71 | my $cwd = getdcwd(); |
72 | my $cwd = getdcwd('C:'); |
73 | |
74 | The getdcwd() function is also provided on Win32 to get the current working |
75 | directory on the specified drive, since Windows maintains a separate current |
76 | working directory for each drive. If no drive is specified then the current |
77 | drive is assumed. |
78 | |
79 | This function simply calls the Microsoft C library _getdcwd() function. |
80 | |
04929354 |
81 | =back |
82 | |
902bacac |
83 | |
04929354 |
84 | =head2 abs_path and friends |
85 | |
86 | These functions are exported only on request. They each take a single |
3ee63918 |
87 | argument and return the absolute pathname for it. If no argument is |
88 | given they'll use the current working directory. |
04929354 |
89 | |
90 | =over 4 |
91 | |
92 | =item abs_path |
93 | |
94 | my $abs_path = abs_path($file); |
95 | |
96 | Uses the same algorithm as getcwd(). Symbolic links and relative-path |
97 | components ("." and "..") are resolved to return the canonical |
98 | pathname, just like realpath(3). |
99 | |
100 | =item realpath |
101 | |
102 | my $abs_path = realpath($file); |
103 | |
104 | A synonym for abs_path(). |
105 | |
106 | =item fast_abs_path |
107 | |
510179aa |
108 | my $abs_path = fast_abs_path($file); |
04929354 |
109 | |
110 | A more dangerous, but potentially faster version of abs_path. |
111 | |
112 | =back |
113 | |
114 | =head2 $ENV{PWD} |
115 | |
116 | If you ask to override your chdir() built-in function, |
117 | |
118 | use Cwd qw(chdir); |
119 | |
120 | then your PWD environment variable will be kept up to date. Note that |
121 | it will only be kept up to date if all packages which use chdir import |
122 | it from Cwd. |
4633a7c4 |
123 | |
4633a7c4 |
124 | |
4d6b4052 |
125 | =head1 NOTES |
126 | |
127 | =over 4 |
128 | |
129 | =item * |
130 | |
04929354 |
131 | Since the path seperators are different on some operating systems ('/' |
132 | on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec |
133 | modules wherever portability is a concern. |
134 | |
04929354 |
135 | =item * |
4d6b4052 |
136 | |
137 | Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()> |
138 | functions are all aliases for the C<cwd()> function, which, on Mac OS, |
139 | calls `pwd`. Likewise, the C<abs_path()> function is an alias for |
140 | C<fast_abs_path()>. |
141 | |
142 | =back |
143 | |
02cc4877 |
144 | =head1 AUTHOR |
145 | |
146 | Originally by the perl5-porters. |
147 | |
78321866 |
148 | Maintained by Ken Williams <KWILLIAMS@cpan.org> |
02cc4877 |
149 | |
99f36a73 |
150 | =head1 COPYRIGHT |
151 | |
152 | Copyright (c) 2004 by the Perl 5 Porters. All rights reserved. |
153 | |
154 | This program is free software; you can redistribute it and/or modify |
155 | it under the same terms as Perl itself. |
156 | |
157 | Portions of the C code in this library are copyright (c) 1994 by the |
158 | Regents of the University of California. All rights reserved. The |
159 | license on this code is compatible with the licensing of the rest of |
160 | the distribution - please see the source code in F<Cwd.xs> for the |
161 | details. |
162 | |
04929354 |
163 | =head1 SEE ALSO |
164 | |
165 | L<File::chdir> |
166 | |
f06db76b |
167 | =cut |
168 | |
b060a406 |
169 | use strict; |
a9939470 |
170 | use Exporter; |
99f36a73 |
171 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); |
172 | |
daee519f |
173 | $VERSION = '3.12'; |
96e4d5b1 |
174 | |
a9939470 |
175 | @ISA = qw/ Exporter /; |
176 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); |
09122b95 |
177 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 |
178 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e |
179 | |
f5f423e4 |
180 | # sys_cwd may keep the builtin command |
181 | |
182 | # All the functionality of this module may provided by builtins, |
183 | # there is no sense to process the rest of the file. |
184 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? |
185 | |
a9939470 |
186 | if ($^O eq 'os2') { |
f5f423e4 |
187 | local $^W = 0; |
a9939470 |
188 | |
189 | *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; |
190 | *getcwd = \&cwd; |
191 | *fastgetcwd = \&cwd; |
192 | *fastcwd = \&cwd; |
193 | |
194 | *fast_abs_path = \&sys_abspath if defined &sys_abspath; |
195 | *abs_path = \&fast_abs_path; |
196 | *realpath = \&fast_abs_path; |
197 | *fast_realpath = \&fast_abs_path; |
198 | |
f5f423e4 |
199 | return 1; |
200 | } |
201 | |
b04f6d36 |
202 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
f22d8e4b |
203 | eval { |
b04f6d36 |
204 | if ( $] >= 5.006 ) { |
205 | require XSLoader; |
206 | XSLoader::load( __PACKAGE__, $VERSION ); |
207 | } else { |
208 | require DynaLoader; |
209 | push @ISA, 'DynaLoader'; |
210 | __PACKAGE__->bootstrap( $VERSION ); |
211 | } |
f22d8e4b |
212 | }; |
4633a7c4 |
213 | |
99f36a73 |
214 | # Must be after the DynaLoader stuff: |
215 | $VERSION = eval $VERSION; |
216 | |
09122b95 |
217 | # Big nasty table of function aliases |
218 | my %METHOD_MAP = |
219 | ( |
220 | VMS => |
221 | { |
222 | cwd => '_vms_cwd', |
223 | getcwd => '_vms_cwd', |
224 | fastcwd => '_vms_cwd', |
225 | fastgetcwd => '_vms_cwd', |
226 | abs_path => '_vms_abs_path', |
227 | fast_abs_path => '_vms_abs_path', |
228 | }, |
229 | |
230 | MSWin32 => |
231 | { |
232 | # We assume that &_NT_cwd is defined as an XSUB or in the core. |
233 | cwd => '_NT_cwd', |
234 | getcwd => '_NT_cwd', |
235 | fastcwd => '_NT_cwd', |
236 | fastgetcwd => '_NT_cwd', |
237 | abs_path => 'fast_abs_path', |
238 | realpath => 'fast_abs_path', |
239 | }, |
240 | |
241 | dos => |
242 | { |
243 | cwd => '_dos_cwd', |
244 | getcwd => '_dos_cwd', |
245 | fastgetcwd => '_dos_cwd', |
246 | fastcwd => '_dos_cwd', |
247 | abs_path => 'fast_abs_path', |
248 | }, |
249 | |
250 | qnx => |
251 | { |
252 | cwd => '_qnx_cwd', |
253 | getcwd => '_qnx_cwd', |
254 | fastgetcwd => '_qnx_cwd', |
255 | fastcwd => '_qnx_cwd', |
256 | abs_path => '_qnx_abs_path', |
257 | fast_abs_path => '_qnx_abs_path', |
258 | }, |
259 | |
260 | cygwin => |
261 | { |
262 | getcwd => 'cwd', |
263 | fastgetcwd => 'cwd', |
264 | fastcwd => 'cwd', |
265 | abs_path => 'fast_abs_path', |
266 | realpath => 'fast_abs_path', |
267 | }, |
268 | |
269 | epoc => |
270 | { |
271 | cwd => '_epoc_cwd', |
272 | getcwd => '_epoc_cwd', |
273 | fastgetcwd => '_epoc_cwd', |
274 | fastcwd => '_epoc_cwd', |
275 | abs_path => 'fast_abs_path', |
276 | }, |
277 | |
278 | MacOS => |
279 | { |
280 | getcwd => 'cwd', |
281 | fastgetcwd => 'cwd', |
282 | fastcwd => 'cwd', |
283 | abs_path => 'fast_abs_path', |
284 | }, |
285 | ); |
286 | |
287 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; |
288 | $METHOD_MAP{nto} = $METHOD_MAP{qnx}; |
289 | |
96e4d5b1 |
290 | |
3547aa9a |
291 | # Find the pwd command in the expected locations. We assume these |
292 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} |
293 | # so everything works under taint mode. |
294 | my $pwd_cmd; |
889f7a4f |
295 | foreach my $try ('/bin/pwd', |
296 | '/usr/bin/pwd', |
297 | '/QOpenSys/bin/pwd', # OS/400 PASE. |
298 | ) { |
299 | |
3547aa9a |
300 | if( -x $try ) { |
301 | $pwd_cmd = $try; |
302 | last; |
303 | } |
304 | } |
522b859a |
305 | unless ($pwd_cmd) { |
889f7a4f |
306 | # Isn't this wrong? _backtick_pwd() will fail if somenone has |
307 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? |
308 | # See [perl #16774]. --jhi |
309 | $pwd_cmd = 'pwd'; |
522b859a |
310 | } |
3547aa9a |
311 | |
a9939470 |
312 | # Lazy-load Carp |
313 | sub _carp { require Carp; Carp::carp(@_) } |
314 | sub _croak { require Carp; Carp::croak(@_) } |
315 | |
3547aa9a |
316 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 |
317 | sub _backtick_pwd { |
f6342b4b |
318 | # Localize %ENV entries in a way that won't create new hash keys |
319 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); |
320 | local @ENV{@localize}; |
321 | |
3547aa9a |
322 | my $cwd = `$pwd_cmd`; |
ac3b20cb |
323 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f |
324 | local $/ = "\n"; |
ac3b20cb |
325 | # `pwd` may fail e.g. if the disk is full |
7e03f963 |
326 | chomp($cwd) if defined $cwd; |
4633a7c4 |
327 | $cwd; |
8b88ae92 |
328 | } |
4633a7c4 |
329 | |
330 | # Since some ports may predefine cwd internally (e.g., NT) |
331 | # we take care not to override an existing definition for cwd(). |
332 | |
09122b95 |
333 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd |
334 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 |
335 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 |
336 | my $os = $^O; # Protect $^O from tainting |
337 | if( $os eq 'MacOS' || (defined $ENV{PATH} && |
338 | $os ne 'MSWin32' && # no pwd on Windows |
09122b95 |
339 | grep { -x "$_/pwd" } split($sep, $ENV{PATH})) ) |
73b801a6 |
340 | { |
ea54c8bd |
341 | *cwd = \&_backtick_pwd; |
342 | } |
343 | else { |
344 | *cwd = \&getcwd; |
345 | } |
346 | } |
a0d0e21e |
347 | |
1f4f94f5 |
348 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
349 | # isn't redefined later (20001212 rspier) |
350 | *fastgetcwd = \&cwd; |
748a9306 |
351 | |
a0d0e21e |
352 | # By Brandon S. Allbery |
353 | # |
354 | # Usage: $cwd = getcwd(); |
355 | |
356 | sub getcwd |
357 | { |
07569ed3 |
358 | abs_path('.'); |
a0d0e21e |
359 | } |
360 | |
a0c9c202 |
361 | |
362 | # By John Bazik |
363 | # |
364 | # Usage: $cwd = &fastcwd; |
365 | # |
366 | # This is a faster version of getcwd. It's also more dangerous because |
367 | # you might chdir out of a directory that you can't chdir back into. |
368 | |
99f36a73 |
369 | sub fastcwd_ { |
a0c9c202 |
370 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
371 | my(@path, $path); |
372 | local(*DIR); |
373 | |
374 | my($orig_cdev, $orig_cino) = stat('.'); |
375 | ($cdev, $cino) = ($orig_cdev, $orig_cino); |
376 | for (;;) { |
377 | my $direntry; |
378 | ($odev, $oino) = ($cdev, $cino); |
379 | CORE::chdir('..') || return undef; |
380 | ($cdev, $cino) = stat('.'); |
381 | last if $odev == $cdev && $oino == $cino; |
382 | opendir(DIR, '.') || return undef; |
383 | for (;;) { |
384 | $direntry = readdir(DIR); |
385 | last unless defined $direntry; |
386 | next if $direntry eq '.'; |
387 | next if $direntry eq '..'; |
388 | |
389 | ($tdev, $tino) = lstat($direntry); |
390 | last unless $tdev != $odev || $tino != $oino; |
391 | } |
392 | closedir(DIR); |
393 | return undef unless defined $direntry; # should never happen |
394 | unshift(@path, $direntry); |
395 | } |
396 | $path = '/' . join('/', @path); |
397 | if ($^O eq 'apollo') { $path = "/".$path; } |
398 | # At this point $path may be tainted (if tainting) and chdir would fail. |
248785eb |
399 | # Untaint it then check that we landed where we started. |
400 | $path =~ /^(.*)\z/s # untaint |
401 | && CORE::chdir($1) or return undef; |
a0c9c202 |
402 | ($cdev, $cino) = stat('.'); |
403 | die "Unstable directory path, current directory changed unexpectedly" |
404 | if $cdev != $orig_cdev || $cino != $orig_cino; |
405 | $path; |
406 | } |
99f36a73 |
407 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 |
408 | |
409 | |
4633a7c4 |
410 | # Keeps track of current working directory in PWD environment var |
a0d0e21e |
411 | # Usage: |
412 | # use Cwd 'chdir'; |
413 | # chdir $newdir; |
414 | |
4633a7c4 |
415 | my $chdir_init = 0; |
a0d0e21e |
416 | |
4633a7c4 |
417 | sub chdir_init { |
3b8e3443 |
418 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e |
419 | my($dd,$di) = stat('.'); |
420 | my($pd,$pi) = stat($ENV{'PWD'}); |
421 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { |
4633a7c4 |
422 | $ENV{'PWD'} = cwd(); |
a0d0e21e |
423 | } |
424 | } |
425 | else { |
3b8e3443 |
426 | my $wd = cwd(); |
427 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; |
428 | $ENV{'PWD'} = $wd; |
a0d0e21e |
429 | } |
4633a7c4 |
430 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 |
431 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e |
432 | my($pd,$pi) = stat($2); |
433 | my($dd,$di) = stat($1); |
434 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { |
435 | $ENV{'PWD'}="$2$3"; |
436 | } |
437 | } |
438 | $chdir_init = 1; |
439 | } |
440 | |
441 | sub chdir { |
22978713 |
442 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
3b8e3443 |
443 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; |
a0d0e21e |
444 | chdir_init() unless $chdir_init; |
4ffa1610 |
445 | my $newpwd; |
446 | if ($^O eq 'MSWin32') { |
447 | # get the full path name *before* the chdir() |
448 | $newpwd = Win32::GetFullPathName($newdir); |
449 | } |
450 | |
4633a7c4 |
451 | return 0 unless CORE::chdir $newdir; |
4ffa1610 |
452 | |
3b8e3443 |
453 | if ($^O eq 'VMS') { |
454 | return $ENV{'PWD'} = $ENV{'DEFAULT'} |
455 | } |
4aecb5b5 |
456 | elsif ($^O eq 'MacOS') { |
457 | return $ENV{'PWD'} = cwd(); |
458 | } |
3b8e3443 |
459 | elsif ($^O eq 'MSWin32') { |
4ffa1610 |
460 | $ENV{'PWD'} = $newpwd; |
3b8e3443 |
461 | return 1; |
462 | } |
748a9306 |
463 | |
392d8ab8 |
464 | if ($newdir =~ m#^/#s) { |
a0d0e21e |
465 | $ENV{'PWD'} = $newdir; |
4633a7c4 |
466 | } else { |
467 | my @curdir = split(m#/#,$ENV{'PWD'}); |
468 | @curdir = ('') unless @curdir; |
469 | my $component; |
a0d0e21e |
470 | foreach $component (split(m#/#, $newdir)) { |
471 | next if $component eq '.'; |
472 | pop(@curdir),next if $component eq '..'; |
473 | push(@curdir,$component); |
474 | } |
475 | $ENV{'PWD'} = join('/',@curdir) || '/'; |
476 | } |
4633a7c4 |
477 | 1; |
a0d0e21e |
478 | } |
479 | |
a0c9c202 |
480 | |
99f36a73 |
481 | sub _perl_abs_path |
a0c9c202 |
482 | { |
483 | my $start = @_ ? shift : '.'; |
484 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); |
485 | |
486 | unless (@cst = stat( $start )) |
487 | { |
a9939470 |
488 | _carp("stat($start): $!"); |
a0c9c202 |
489 | return ''; |
490 | } |
09122b95 |
491 | |
492 | unless (-d _) { |
493 | # Make sure we can be invoked on plain files, not just directories. |
494 | # NOTE that this routine assumes that '/' is the only directory separator. |
495 | |
496 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} |
497 | or return cwd() . '/' . $start; |
498 | |
275e8705 |
499 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
500 | if (-l $start) { |
09122b95 |
501 | my $link_target = readlink($start); |
502 | die "Can't resolve link $start: $!" unless defined $link_target; |
503 | |
504 | require File::Spec; |
505 | $link_target = $dir . '/' . $link_target |
506 | unless File::Spec->file_name_is_absolute($link_target); |
507 | |
508 | return abs_path($link_target); |
509 | } |
510 | |
99f36a73 |
511 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 |
512 | } |
513 | |
a0c9c202 |
514 | $cwd = ''; |
515 | $dotdots = $start; |
516 | do |
517 | { |
518 | $dotdots .= '/..'; |
519 | @pst = @cst; |
a25ef67d |
520 | local *PARENT; |
a0c9c202 |
521 | unless (opendir(PARENT, $dotdots)) |
522 | { |
a9939470 |
523 | _carp("opendir($dotdots): $!"); |
a0c9c202 |
524 | return ''; |
525 | } |
526 | unless (@cst = stat($dotdots)) |
527 | { |
a9939470 |
528 | _carp("stat($dotdots): $!"); |
a0c9c202 |
529 | closedir(PARENT); |
530 | return ''; |
531 | } |
532 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) |
533 | { |
534 | $dir = undef; |
535 | } |
536 | else |
537 | { |
538 | do |
539 | { |
540 | unless (defined ($dir = readdir(PARENT))) |
541 | { |
a9939470 |
542 | _carp("readdir($dotdots): $!"); |
a0c9c202 |
543 | closedir(PARENT); |
544 | return ''; |
545 | } |
546 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) |
547 | } |
548 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || |
549 | $tst[1] != $pst[1]); |
550 | } |
551 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; |
552 | closedir(PARENT); |
553 | } while (defined $dir); |
554 | chop($cwd) unless $cwd eq '/'; # drop the trailing / |
555 | $cwd; |
556 | } |
557 | |
558 | |
3ee63918 |
559 | my $Curdir; |
96e4d5b1 |
560 | sub fast_abs_path { |
99f36a73 |
561 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 |
562 | my $cwd = getcwd(); |
4d6b4052 |
563 | require File::Spec; |
3ee63918 |
564 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
565 | |
566 | # Detaint else we'll explode in taint mode. This is safe because |
567 | # we're not doing anything dangerous with it. |
568 | ($path) = $path =~ /(.*)/; |
569 | ($cwd) = $cwd =~ /(.*)/; |
570 | |
09122b95 |
571 | unless (-e $path) { |
572 | _croak("$path: No such file or directory"); |
573 | } |
574 | |
575 | unless (-d _) { |
576 | # Make sure we can be invoked on plain files, not just directories. |
577 | |
578 | my ($vol, $dir, $file) = File::Spec->splitpath($path); |
579 | return File::Spec->catfile($cwd, $path) unless length $dir; |
580 | |
581 | if (-l $path) { |
582 | my $link_target = readlink($path); |
583 | die "Can't resolve link $path: $!" unless defined $link_target; |
584 | |
585 | $link_target = File::Spec->catpath($vol, $dir, $link_target) |
586 | unless File::Spec->file_name_is_absolute($link_target); |
587 | |
588 | return fast_abs_path($link_target); |
589 | } |
590 | |
d6802e43 |
591 | return $dir eq File::Spec->rootdir |
99f36a73 |
592 | ? File::Spec->catpath($vol, $dir, $file) |
593 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; |
09122b95 |
594 | } |
595 | |
e2ba406b |
596 | if (!CORE::chdir($path)) { |
a9939470 |
597 | _croak("Cannot chdir to $path: $!"); |
e2ba406b |
598 | } |
96e4d5b1 |
599 | my $realpath = getcwd(); |
e2ba406b |
600 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 |
601 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b |
602 | } |
96e4d5b1 |
603 | $realpath; |
8b88ae92 |
604 | } |
605 | |
e4c51978 |
606 | # added function alias to follow principle of least surprise |
607 | # based on previous aliasing. --tchrist 27-Jan-00 |
608 | *fast_realpath = \&fast_abs_path; |
609 | |
4633a7c4 |
610 | |
611 | # --- PORTING SECTION --- |
612 | |
613 | # VMS: $ENV{'DEFAULT'} points to default directory at all times |
bd3fa61c |
614 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 |
615 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 |
616 | # in the process logical name table as the default device and directory |
617 | # seen by Perl. This may not be the same as the default device |
4633a7c4 |
618 | # and directory seen by DCL after Perl exits, since the effects |
619 | # the CRTL chdir() function persist only until Perl exits. |
4633a7c4 |
620 | |
621 | sub _vms_cwd { |
96e4d5b1 |
622 | return $ENV{'DEFAULT'}; |
623 | } |
624 | |
625 | sub _vms_abs_path { |
626 | return $ENV{'DEFAULT'} unless @_; |
9d7d9729 |
627 | |
628 | # may need to turn foo.dir into [.foo] |
96e4d5b1 |
629 | my $path = VMS::Filespec::pathify($_[0]); |
9d7d9729 |
630 | $path = $_[0] unless defined $path; |
631 | |
96e4d5b1 |
632 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 |
633 | } |
68dc0745 |
634 | |
4633a7c4 |
635 | sub _os2_cwd { |
636 | $ENV{'PWD'} = `cmd /c cd`; |
39741d73 |
637 | chomp $ENV{'PWD'}; |
aa6b7957 |
638 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 |
639 | return $ENV{'PWD'}; |
640 | } |
641 | |
96e4d5b1 |
642 | sub _win32_cwd { |
2d7a9237 |
643 | $ENV{'PWD'} = Win32::GetCwd(); |
aa6b7957 |
644 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 |
645 | return $ENV{'PWD'}; |
646 | } |
647 | |
f6342b4b |
648 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd; |
68dc0745 |
649 | |
39e571d4 |
650 | sub _dos_cwd { |
651 | if (!defined &Dos::GetCwd) { |
652 | $ENV{'PWD'} = `command /c cd`; |
39741d73 |
653 | chomp $ENV{'PWD'}; |
aa6b7957 |
654 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 |
655 | } else { |
656 | $ENV{'PWD'} = Dos::GetCwd(); |
657 | } |
55497cff |
658 | return $ENV{'PWD'}; |
659 | } |
660 | |
7fbf1995 |
661 | sub _qnx_cwd { |
35b807ef |
662 | local $ENV{PATH} = ''; |
663 | local $ENV{CDPATH} = ''; |
664 | local $ENV{ENV} = ''; |
7fbf1995 |
665 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 |
666 | chomp $ENV{'PWD'}; |
7fbf1995 |
667 | return $ENV{'PWD'}; |
668 | } |
669 | |
670 | sub _qnx_abs_path { |
35b807ef |
671 | local $ENV{PATH} = ''; |
672 | local $ENV{CDPATH} = ''; |
673 | local $ENV{ENV} = ''; |
fa921dc6 |
674 | my $path = @_ ? shift : '.'; |
39741d73 |
675 | local *REALPATH; |
676 | |
99f36a73 |
677 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 |
678 | die "Can't open /usr/bin/fullpath: $!"; |
679 | my $realpath = <REALPATH>; |
680 | close REALPATH; |
681 | chomp $realpath; |
7fbf1995 |
682 | return $realpath; |
683 | } |
684 | |
ed79a026 |
685 | sub _epoc_cwd { |
686 | $ENV{'PWD'} = EPOC::getcwd(); |
687 | return $ENV{'PWD'}; |
688 | } |
689 | |
4633a7c4 |
690 | |
09122b95 |
691 | # Now that all the base-level functions are set up, alias the |
692 | # user-level functions to the right places |
693 | |
694 | if (exists $METHOD_MAP{$^O}) { |
695 | my $map = $METHOD_MAP{$^O}; |
696 | foreach my $name (keys %$map) { |
99f36a73 |
697 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 |
698 | no strict 'refs'; |
699 | *{$name} = \&{$map->{$name}}; |
700 | } |
55497cff |
701 | } |
4633a7c4 |
702 | |
99f36a73 |
703 | # In case the XS version doesn't load. |
704 | *abs_path = \&_perl_abs_path unless defined &abs_path; |
705 | |
706 | # added function alias for those of us more |
707 | # used to the libc function. --tchrist 27-Jan-00 |
708 | *realpath = \&abs_path; |
4633a7c4 |
709 | |
a0d0e21e |
710 | 1; |