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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 | |
6a288e04 |
174 | $VERSION = '3.15'; |
96e4d5b1 |
175 | |
a9939470 |
176 | @ISA = qw/ Exporter /; |
177 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); |
09122b95 |
178 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 |
179 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e |
180 | |
f5f423e4 |
181 | # sys_cwd may keep the builtin command |
182 | |
183 | # All the functionality of this module may provided by builtins, |
184 | # there is no sense to process the rest of the file. |
185 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? |
186 | |
a9939470 |
187 | if ($^O eq 'os2') { |
f5f423e4 |
188 | local $^W = 0; |
a9939470 |
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 |
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 |
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 |
215 | # Must be after the DynaLoader stuff: |
216 | $VERSION = eval $VERSION; |
217 | |
09122b95 |
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 |
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 |
296 | foreach my $try ('/bin/pwd', |
297 | '/usr/bin/pwd', |
298 | '/QOpenSys/bin/pwd', # OS/400 PASE. |
299 | ) { |
300 | |
3547aa9a |
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 |
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 |
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 |
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 | $cwd; |
8b88ae92 |
330 | } |
4633a7c4 |
331 | |
332 | # Since some ports may predefine cwd internally (e.g., NT) |
333 | # we take care not to override an existing definition for cwd(). |
334 | |
09122b95 |
335 | unless ($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 |
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 |
353 | *cwd = \&_backtick_pwd; |
354 | } |
355 | else { |
356 | *cwd = \&getcwd; |
357 | } |
358 | } |
a0d0e21e |
359 | |
1f4f94f5 |
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 |
364 | # By Brandon S. Allbery |
365 | # |
366 | # Usage: $cwd = getcwd(); |
367 | |
368 | sub _perl_getcwd |
369 | { |
370 | abs_path('.'); |
371 | } |
372 | |
a0c9c202 |
373 | # By John Bazik |
374 | # |
375 | # Usage: $cwd = &fastcwd; |
376 | # |
377 | # This is a faster version of getcwd. It's also more dangerous because |
378 | # you might chdir out of a directory that you can't chdir back into. |
379 | |
99f36a73 |
380 | sub fastcwd_ { |
a0c9c202 |
381 | my($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 |
410 | # Untaint it then check that we landed where we started. |
411 | $path =~ /^(.*)\z/s # untaint |
412 | && CORE::chdir($1) or return undef; |
a0c9c202 |
413 | ($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 |
419 | |
420 | |
4633a7c4 |
421 | # Keeps track of current working directory in PWD environment var |
a0d0e21e |
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 $^O ne 'MSWin32') { |
a0d0e21e |
430 | my($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 |
434 | } |
435 | } |
436 | else { |
3b8e3443 |
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 $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e |
443 | my($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 |
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 $newdir; |
4ffa1610 |
463 | |
3b8e3443 |
464 | if ($^O eq 'VMS') { |
465 | return $ENV{'PWD'} = $ENV{'DEFAULT'} |
466 | } |
4aecb5b5 |
467 | elsif ($^O eq 'MacOS') { |
468 | return $ENV{'PWD'} = cwd(); |
469 | } |
3b8e3443 |
470 | elsif ($^O eq 'MSWin32') { |
4ffa1610 |
471 | $ENV{'PWD'} = $newpwd; |
3b8e3443 |
472 | return 1; |
473 | } |
748a9306 |
474 | |
392d8ab8 |
475 | if ($newdir =~ m#^/#s) { |
a0d0e21e |
476 | $ENV{'PWD'} = $newdir; |
4633a7c4 |
477 | } else { |
478 | my @curdir = split(m#/#,$ENV{'PWD'}); |
479 | @curdir = ('') unless @curdir; |
480 | my $component; |
a0d0e21e |
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 |
489 | } |
490 | |
a0c9c202 |
491 | |
99f36a73 |
492 | sub _perl_abs_path |
a0c9c202 |
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): $!"); |
a0c9c202 |
500 | return ''; |
501 | } |
09122b95 |
502 | |
503 | unless (-d _) { |
504 | # Make sure we can be invoked on plain files, not just directories. |
505 | # NOTE that this routine assumes that '/' is the only directory separator. |
506 | |
507 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} |
508 | or return cwd() . '/' . $start; |
509 | |
275e8705 |
510 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
511 | if (-l $start) { |
09122b95 |
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 |
523 | } |
524 | |
a0c9c202 |
525 | $cwd = ''; |
526 | $dotdots = $start; |
527 | do |
528 | { |
529 | $dotdots .= '/..'; |
530 | @pst = @cst; |
a25ef67d |
531 | local *PARENT; |
a0c9c202 |
532 | unless (opendir(PARENT, $dotdots)) |
533 | { |
a9939470 |
534 | _carp("opendir($dotdots): $!"); |
a0c9c202 |
535 | return ''; |
536 | } |
537 | unless (@cst = stat($dotdots)) |
538 | { |
a9939470 |
539 | _carp("stat($dotdots): $!"); |
a0c9c202 |
540 | closedir(PARENT); |
541 | return ''; |
542 | } |
543 | if ($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 |
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 |
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 |
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 $dir eq File::Spec->rootdir |
99f36a73 |
603 | ? File::Spec->catpath($vol, $dir, $file) |
604 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; |
09122b95 |
605 | } |
606 | |
e2ba406b |
607 | if (!CORE::chdir($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 |
615 | } |
616 | |
e4c51978 |
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 |
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 |
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 |
629 | # and directory seen by DCL after Perl exits, since the effects |
630 | # the CRTL chdir() function persist only until Perl exits. |
4633a7c4 |
631 | |
632 | sub _vms_cwd { |
96e4d5b1 |
633 | return $ENV{'DEFAULT'}; |
634 | } |
635 | |
636 | sub _vms_abs_path { |
637 | return $ENV{'DEFAULT'} unless @_; |
9d7d9729 |
638 | |
639 | # may need to turn foo.dir into [.foo] |
96e4d5b1 |
640 | my $path = VMS::Filespec::pathify($_[0]); |
9d7d9729 |
641 | $path = $_[0] unless defined $path; |
642 | |
96e4d5b1 |
643 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 |
644 | } |
68dc0745 |
645 | |
4633a7c4 |
646 | sub _os2_cwd { |
647 | $ENV{'PWD'} = `cmd /c cd`; |
39741d73 |
648 | chomp $ENV{'PWD'}; |
aa6b7957 |
649 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 |
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 |
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 |
666 | } else { |
667 | $ENV{'PWD'} = Dos::GetCwd(); |
668 | } |
55497cff |
669 | return $ENV{'PWD'}; |
670 | } |
671 | |
7fbf1995 |
672 | sub _qnx_cwd { |
35b807ef |
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 |
678 | return $ENV{'PWD'}; |
679 | } |
680 | |
681 | sub _qnx_abs_path { |
35b807ef |
682 | local $ENV{PATH} = ''; |
683 | local $ENV{CDPATH} = ''; |
684 | local $ENV{ENV} = ''; |
fa921dc6 |
685 | my $path = @_ ? shift : '.'; |
39741d73 |
686 | local *REALPATH; |
687 | |
99f36a73 |
688 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 |
689 | die "Can't open /usr/bin/fullpath: $!"; |
690 | my $realpath = <REALPATH>; |
691 | close REALPATH; |
692 | chomp $realpath; |
7fbf1995 |
693 | return $realpath; |
694 | } |
695 | |
ed79a026 |
696 | sub _epoc_cwd { |
697 | $ENV{'PWD'} = EPOC::getcwd(); |
698 | return $ENV{'PWD'}; |
699 | } |
700 | |
4633a7c4 |
701 | |
09122b95 |
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 $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 |
709 | no strict 'refs'; |
710 | *{$name} = \&{$map->{$name}}; |
711 | } |
55497cff |
712 | } |
4633a7c4 |
713 | |
99f36a73 |
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 |
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; |