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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 | |
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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 | |
6c34c321 |
174 | $VERSION = '3.30'; |
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 | |
53e80d0b |
205 | # Need to look up the feature settings on VMS. The preferred way is to use the |
206 | # VMS::Feature module, but that may not be available to dual life modules. |
207 | |
208 | my $use_vms_feature; |
209 | BEGIN { |
210 | if ($^O eq 'VMS') { |
211 | if (eval { local $SIG{__DIE__}; require VMS::Feature; }) { |
212 | $use_vms_feature = 1; |
213 | } |
214 | } |
215 | } |
216 | |
217 | # Need to look up the UNIX report mode. This may become a dynamic mode |
218 | # in the future. |
219 | sub _vms_unix_rpt { |
220 | my $unix_rpt; |
221 | if ($use_vms_feature) { |
222 | $unix_rpt = VMS::Feature::current("filename_unix_report"); |
223 | } else { |
224 | my $env_unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || ''; |
225 | $unix_rpt = $env_unix_rpt =~ /^[ET1]/i; |
226 | } |
227 | return $unix_rpt; |
228 | } |
229 | |
230 | # Need to look up the EFS character set mode. This may become a dynamic |
231 | # mode in the future. |
232 | sub _vms_efs { |
233 | my $efs; |
234 | if ($use_vms_feature) { |
235 | $efs = VMS::Feature::current("efs_charset"); |
236 | } else { |
237 | my $env_efs = $ENV{'DECC$EFS_CHARSET'} || ''; |
238 | $efs = $env_efs =~ /^[ET1]/i; |
239 | } |
240 | return $efs; |
241 | } |
242 | |
243 | |
b04f6d36 |
244 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
f22d8e4b |
245 | eval { |
b04f6d36 |
246 | if ( $] >= 5.006 ) { |
247 | require XSLoader; |
4a4ab19c |
248 | XSLoader::load( __PACKAGE__, $xs_version); |
b04f6d36 |
249 | } else { |
250 | require DynaLoader; |
251 | push @ISA, 'DynaLoader'; |
4a4ab19c |
252 | __PACKAGE__->bootstrap( $xs_version ); |
b04f6d36 |
253 | } |
f22d8e4b |
254 | }; |
4633a7c4 |
255 | |
99f36a73 |
256 | # Must be after the DynaLoader stuff: |
257 | $VERSION = eval $VERSION; |
258 | |
09122b95 |
259 | # Big nasty table of function aliases |
260 | my %METHOD_MAP = |
261 | ( |
262 | VMS => |
263 | { |
264 | cwd => '_vms_cwd', |
265 | getcwd => '_vms_cwd', |
266 | fastcwd => '_vms_cwd', |
267 | fastgetcwd => '_vms_cwd', |
268 | abs_path => '_vms_abs_path', |
269 | fast_abs_path => '_vms_abs_path', |
270 | }, |
271 | |
272 | MSWin32 => |
273 | { |
274 | # We assume that &_NT_cwd is defined as an XSUB or in the core. |
275 | cwd => '_NT_cwd', |
276 | getcwd => '_NT_cwd', |
277 | fastcwd => '_NT_cwd', |
278 | fastgetcwd => '_NT_cwd', |
279 | abs_path => 'fast_abs_path', |
280 | realpath => 'fast_abs_path', |
281 | }, |
282 | |
283 | dos => |
284 | { |
285 | cwd => '_dos_cwd', |
286 | getcwd => '_dos_cwd', |
287 | fastgetcwd => '_dos_cwd', |
288 | fastcwd => '_dos_cwd', |
289 | abs_path => 'fast_abs_path', |
290 | }, |
291 | |
58ccccf6 |
292 | # QNX4. QNX6 has a $os of 'nto'. |
09122b95 |
293 | qnx => |
294 | { |
295 | cwd => '_qnx_cwd', |
296 | getcwd => '_qnx_cwd', |
297 | fastgetcwd => '_qnx_cwd', |
298 | fastcwd => '_qnx_cwd', |
299 | abs_path => '_qnx_abs_path', |
300 | fast_abs_path => '_qnx_abs_path', |
301 | }, |
302 | |
303 | cygwin => |
304 | { |
305 | getcwd => 'cwd', |
306 | fastgetcwd => 'cwd', |
307 | fastcwd => 'cwd', |
308 | abs_path => 'fast_abs_path', |
309 | realpath => 'fast_abs_path', |
310 | }, |
311 | |
312 | epoc => |
313 | { |
314 | cwd => '_epoc_cwd', |
315 | getcwd => '_epoc_cwd', |
316 | fastgetcwd => '_epoc_cwd', |
317 | fastcwd => '_epoc_cwd', |
318 | abs_path => 'fast_abs_path', |
319 | }, |
320 | |
321 | MacOS => |
322 | { |
323 | getcwd => 'cwd', |
324 | fastgetcwd => 'cwd', |
325 | fastcwd => 'cwd', |
326 | abs_path => 'fast_abs_path', |
327 | }, |
328 | ); |
329 | |
330 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; |
09122b95 |
331 | |
96e4d5b1 |
332 | |
3547aa9a |
333 | # Find the pwd command in the expected locations. We assume these |
334 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} |
335 | # so everything works under taint mode. |
336 | my $pwd_cmd; |
889f7a4f |
337 | foreach my $try ('/bin/pwd', |
338 | '/usr/bin/pwd', |
339 | '/QOpenSys/bin/pwd', # OS/400 PASE. |
340 | ) { |
341 | |
3547aa9a |
342 | if( -x $try ) { |
343 | $pwd_cmd = $try; |
344 | last; |
345 | } |
346 | } |
fa52125f |
347 | my $found_pwd_cmd = defined($pwd_cmd); |
522b859a |
348 | unless ($pwd_cmd) { |
889f7a4f |
349 | # Isn't this wrong? _backtick_pwd() will fail if somenone has |
350 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? |
351 | # See [perl #16774]. --jhi |
352 | $pwd_cmd = 'pwd'; |
522b859a |
353 | } |
3547aa9a |
354 | |
a9939470 |
355 | # Lazy-load Carp |
356 | sub _carp { require Carp; Carp::carp(@_) } |
357 | sub _croak { require Carp; Carp::croak(@_) } |
358 | |
3547aa9a |
359 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 |
360 | sub _backtick_pwd { |
f6342b4b |
361 | # Localize %ENV entries in a way that won't create new hash keys |
362 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); |
363 | local @ENV{@localize}; |
364 | |
3547aa9a |
365 | my $cwd = `$pwd_cmd`; |
ac3b20cb |
366 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f |
367 | local $/ = "\n"; |
ac3b20cb |
368 | # `pwd` may fail e.g. if the disk is full |
7e03f963 |
369 | chomp($cwd) if defined $cwd; |
4633a7c4 |
370 | $cwd; |
8b88ae92 |
371 | } |
4633a7c4 |
372 | |
373 | # Since some ports may predefine cwd internally (e.g., NT) |
374 | # we take care not to override an existing definition for cwd(). |
375 | |
09122b95 |
376 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd |
377 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 |
378 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 |
379 | my $os = $^O; # Protect $^O from tainting |
fa52125f |
380 | |
381 | |
382 | # Try again to find a pwd, this time searching the whole PATH. |
383 | if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows |
384 | my @candidates = split($sep, $ENV{PATH}); |
385 | while (!$found_pwd_cmd and @candidates) { |
386 | my $candidate = shift @candidates; |
387 | $found_pwd_cmd = 1 if -x "$candidate/pwd"; |
388 | } |
389 | } |
390 | |
391 | # MacOS has some special magic to make `pwd` work. |
392 | if( $os eq 'MacOS' || $found_pwd_cmd ) |
73b801a6 |
393 | { |
ea54c8bd |
394 | *cwd = \&_backtick_pwd; |
395 | } |
396 | else { |
397 | *cwd = \&getcwd; |
398 | } |
399 | } |
a0d0e21e |
400 | |
23bb49fa |
401 | if ($^O eq 'cygwin') { |
402 | # We need to make sure cwd() is called with no args, because it's |
403 | # got an arg-less prototype and will die if args are present. |
404 | local $^W = 0; |
405 | my $orig_cwd = \&cwd; |
406 | *cwd = sub { &$orig_cwd() } |
407 | } |
408 | |
409 | |
1f4f94f5 |
410 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
411 | # isn't redefined later (20001212 rspier) |
412 | *fastgetcwd = \&cwd; |
748a9306 |
413 | |
c47834cd |
414 | # A non-XS version of getcwd() - also used to bootstrap the perl build |
415 | # process, when miniperl is running and no XS loading happens. |
a7a23d71 |
416 | sub _perl_getcwd |
417 | { |
418 | abs_path('.'); |
419 | } |
420 | |
a0c9c202 |
421 | # By John Bazik |
422 | # |
423 | # Usage: $cwd = &fastcwd; |
424 | # |
425 | # This is a faster version of getcwd. It's also more dangerous because |
426 | # you might chdir out of a directory that you can't chdir back into. |
427 | |
99f36a73 |
428 | sub fastcwd_ { |
a0c9c202 |
429 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
430 | my(@path, $path); |
431 | local(*DIR); |
432 | |
433 | my($orig_cdev, $orig_cino) = stat('.'); |
434 | ($cdev, $cino) = ($orig_cdev, $orig_cino); |
435 | for (;;) { |
436 | my $direntry; |
437 | ($odev, $oino) = ($cdev, $cino); |
438 | CORE::chdir('..') || return undef; |
439 | ($cdev, $cino) = stat('.'); |
440 | last if $odev == $cdev && $oino == $cino; |
441 | opendir(DIR, '.') || return undef; |
442 | for (;;) { |
443 | $direntry = readdir(DIR); |
444 | last unless defined $direntry; |
445 | next if $direntry eq '.'; |
446 | next if $direntry eq '..'; |
447 | |
448 | ($tdev, $tino) = lstat($direntry); |
449 | last unless $tdev != $odev || $tino != $oino; |
450 | } |
451 | closedir(DIR); |
452 | return undef unless defined $direntry; # should never happen |
453 | unshift(@path, $direntry); |
454 | } |
455 | $path = '/' . join('/', @path); |
456 | if ($^O eq 'apollo') { $path = "/".$path; } |
457 | # At this point $path may be tainted (if tainting) and chdir would fail. |
248785eb |
458 | # Untaint it then check that we landed where we started. |
459 | $path =~ /^(.*)\z/s # untaint |
460 | && CORE::chdir($1) or return undef; |
a0c9c202 |
461 | ($cdev, $cino) = stat('.'); |
462 | die "Unstable directory path, current directory changed unexpectedly" |
463 | if $cdev != $orig_cdev || $cino != $orig_cino; |
464 | $path; |
465 | } |
99f36a73 |
466 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 |
467 | |
468 | |
4633a7c4 |
469 | # Keeps track of current working directory in PWD environment var |
a0d0e21e |
470 | # Usage: |
471 | # use Cwd 'chdir'; |
472 | # chdir $newdir; |
473 | |
4633a7c4 |
474 | my $chdir_init = 0; |
a0d0e21e |
475 | |
4633a7c4 |
476 | sub chdir_init { |
3b8e3443 |
477 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e |
478 | my($dd,$di) = stat('.'); |
479 | my($pd,$pi) = stat($ENV{'PWD'}); |
480 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { |
4633a7c4 |
481 | $ENV{'PWD'} = cwd(); |
a0d0e21e |
482 | } |
483 | } |
484 | else { |
3b8e3443 |
485 | my $wd = cwd(); |
486 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; |
487 | $ENV{'PWD'} = $wd; |
a0d0e21e |
488 | } |
4633a7c4 |
489 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 |
490 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e |
491 | my($pd,$pi) = stat($2); |
492 | my($dd,$di) = stat($1); |
493 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { |
494 | $ENV{'PWD'}="$2$3"; |
495 | } |
496 | } |
497 | $chdir_init = 1; |
498 | } |
499 | |
500 | sub chdir { |
22978713 |
501 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
3b8e3443 |
502 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; |
a0d0e21e |
503 | chdir_init() unless $chdir_init; |
4ffa1610 |
504 | my $newpwd; |
505 | if ($^O eq 'MSWin32') { |
506 | # get the full path name *before* the chdir() |
507 | $newpwd = Win32::GetFullPathName($newdir); |
508 | } |
509 | |
4633a7c4 |
510 | return 0 unless CORE::chdir $newdir; |
4ffa1610 |
511 | |
3b8e3443 |
512 | if ($^O eq 'VMS') { |
513 | return $ENV{'PWD'} = $ENV{'DEFAULT'} |
514 | } |
4aecb5b5 |
515 | elsif ($^O eq 'MacOS') { |
516 | return $ENV{'PWD'} = cwd(); |
517 | } |
3b8e3443 |
518 | elsif ($^O eq 'MSWin32') { |
4ffa1610 |
519 | $ENV{'PWD'} = $newpwd; |
3b8e3443 |
520 | return 1; |
521 | } |
748a9306 |
522 | |
e9475de8 |
523 | if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in |
524 | $ENV{'PWD'} = cwd(); |
525 | } elsif ($newdir =~ m#^/#s) { |
a0d0e21e |
526 | $ENV{'PWD'} = $newdir; |
4633a7c4 |
527 | } else { |
528 | my @curdir = split(m#/#,$ENV{'PWD'}); |
529 | @curdir = ('') unless @curdir; |
530 | my $component; |
a0d0e21e |
531 | foreach $component (split(m#/#, $newdir)) { |
532 | next if $component eq '.'; |
533 | pop(@curdir),next if $component eq '..'; |
534 | push(@curdir,$component); |
535 | } |
536 | $ENV{'PWD'} = join('/',@curdir) || '/'; |
537 | } |
4633a7c4 |
538 | 1; |
a0d0e21e |
539 | } |
540 | |
a0c9c202 |
541 | |
99f36a73 |
542 | sub _perl_abs_path |
a0c9c202 |
543 | { |
544 | my $start = @_ ? shift : '.'; |
545 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); |
546 | |
547 | unless (@cst = stat( $start )) |
548 | { |
a9939470 |
549 | _carp("stat($start): $!"); |
a0c9c202 |
550 | return ''; |
551 | } |
09122b95 |
552 | |
553 | unless (-d _) { |
554 | # Make sure we can be invoked on plain files, not just directories. |
555 | # NOTE that this routine assumes that '/' is the only directory separator. |
556 | |
557 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} |
558 | or return cwd() . '/' . $start; |
559 | |
275e8705 |
560 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
561 | if (-l $start) { |
09122b95 |
562 | my $link_target = readlink($start); |
563 | die "Can't resolve link $start: $!" unless defined $link_target; |
564 | |
565 | require File::Spec; |
566 | $link_target = $dir . '/' . $link_target |
567 | unless File::Spec->file_name_is_absolute($link_target); |
568 | |
569 | return abs_path($link_target); |
570 | } |
571 | |
99f36a73 |
572 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 |
573 | } |
574 | |
a0c9c202 |
575 | $cwd = ''; |
576 | $dotdots = $start; |
577 | do |
578 | { |
579 | $dotdots .= '/..'; |
580 | @pst = @cst; |
a25ef67d |
581 | local *PARENT; |
a0c9c202 |
582 | unless (opendir(PARENT, $dotdots)) |
583 | { |
bf7c0a3d |
584 | # probably a permissions issue. Try the native command. |
585 | return File::Spec->rel2abs( $start, _backtick_pwd() ); |
a0c9c202 |
586 | } |
587 | unless (@cst = stat($dotdots)) |
588 | { |
a9939470 |
589 | _carp("stat($dotdots): $!"); |
a0c9c202 |
590 | closedir(PARENT); |
591 | return ''; |
592 | } |
593 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) |
594 | { |
595 | $dir = undef; |
596 | } |
597 | else |
598 | { |
599 | do |
600 | { |
601 | unless (defined ($dir = readdir(PARENT))) |
602 | { |
a9939470 |
603 | _carp("readdir($dotdots): $!"); |
a0c9c202 |
604 | closedir(PARENT); |
605 | return ''; |
606 | } |
607 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) |
608 | } |
609 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || |
610 | $tst[1] != $pst[1]); |
611 | } |
612 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; |
613 | closedir(PARENT); |
614 | } while (defined $dir); |
615 | chop($cwd) unless $cwd eq '/'; # drop the trailing / |
616 | $cwd; |
617 | } |
618 | |
619 | |
3ee63918 |
620 | my $Curdir; |
96e4d5b1 |
621 | sub fast_abs_path { |
99f36a73 |
622 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 |
623 | my $cwd = getcwd(); |
4d6b4052 |
624 | require File::Spec; |
3ee63918 |
625 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
626 | |
627 | # Detaint else we'll explode in taint mode. This is safe because |
628 | # we're not doing anything dangerous with it. |
629 | ($path) = $path =~ /(.*)/; |
630 | ($cwd) = $cwd =~ /(.*)/; |
631 | |
09122b95 |
632 | unless (-e $path) { |
633 | _croak("$path: No such file or directory"); |
634 | } |
635 | |
636 | unless (-d _) { |
637 | # Make sure we can be invoked on plain files, not just directories. |
638 | |
639 | my ($vol, $dir, $file) = File::Spec->splitpath($path); |
640 | return File::Spec->catfile($cwd, $path) unless length $dir; |
641 | |
642 | if (-l $path) { |
643 | my $link_target = readlink($path); |
644 | die "Can't resolve link $path: $!" unless defined $link_target; |
645 | |
646 | $link_target = File::Spec->catpath($vol, $dir, $link_target) |
647 | unless File::Spec->file_name_is_absolute($link_target); |
648 | |
649 | return fast_abs_path($link_target); |
650 | } |
651 | |
d6802e43 |
652 | return $dir eq File::Spec->rootdir |
99f36a73 |
653 | ? File::Spec->catpath($vol, $dir, $file) |
654 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; |
09122b95 |
655 | } |
656 | |
e2ba406b |
657 | if (!CORE::chdir($path)) { |
a9939470 |
658 | _croak("Cannot chdir to $path: $!"); |
e2ba406b |
659 | } |
96e4d5b1 |
660 | my $realpath = getcwd(); |
e2ba406b |
661 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 |
662 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b |
663 | } |
96e4d5b1 |
664 | $realpath; |
8b88ae92 |
665 | } |
666 | |
e4c51978 |
667 | # added function alias to follow principle of least surprise |
668 | # based on previous aliasing. --tchrist 27-Jan-00 |
669 | *fast_realpath = \&fast_abs_path; |
670 | |
4633a7c4 |
671 | |
672 | # --- PORTING SECTION --- |
673 | |
674 | # VMS: $ENV{'DEFAULT'} points to default directory at all times |
bd3fa61c |
675 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 |
676 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 |
677 | # in the process logical name table as the default device and directory |
678 | # seen by Perl. This may not be the same as the default device |
4633a7c4 |
679 | # and directory seen by DCL after Perl exits, since the effects |
680 | # the CRTL chdir() function persist only until Perl exits. |
4633a7c4 |
681 | |
682 | sub _vms_cwd { |
96e4d5b1 |
683 | return $ENV{'DEFAULT'}; |
684 | } |
685 | |
686 | sub _vms_abs_path { |
687 | return $ENV{'DEFAULT'} unless @_; |
61729915 |
688 | my $path = shift; |
9d7d9729 |
689 | |
53e80d0b |
690 | my $efs = _vms_efs; |
691 | my $unix_rpt = _vms_unix_rpt; |
692 | |
693 | if (defined &VMS::Filespec::vmsrealpath) { |
694 | my $path_unix = 0; |
695 | my $path_vms = 0; |
696 | |
697 | $path_unix = 1 if ($path =~ m#(?<=\^)/#); |
698 | $path_unix = 1 if ($path =~ /^\.\.?$/); |
699 | $path_vms = 1 if ($path =~ m#[\[<\]]#); |
700 | $path_vms = 1 if ($path =~ /^--?$/); |
701 | |
702 | my $unix_mode = $path_unix; |
703 | if ($efs) { |
704 | # In case of a tie, the Unix report mode decides. |
705 | if ($path_vms == $path_unix) { |
706 | $unix_mode = $unix_rpt; |
707 | } else { |
708 | $unix_mode = 0 if $path_vms; |
709 | } |
710 | } |
9d7d9729 |
711 | |
53e80d0b |
712 | if ($unix_mode) { |
bf7c0a3d |
713 | # Unix format |
53e80d0b |
714 | return VMS::Filespec::unixrealpath($path); |
bf7c0a3d |
715 | } |
716 | |
717 | # VMS format |
718 | |
53e80d0b |
719 | my $new_path = VMS::Filespec::vmsrealpath($path); |
bf7c0a3d |
720 | |
721 | # Perl expects directories to be in directory format |
722 | $new_path = VMS::Filespec::pathify($new_path) if -d $path; |
723 | return $new_path; |
724 | } |
725 | |
726 | # Fallback to older algorithm if correct ones are not |
727 | # available. |
728 | |
53e80d0b |
729 | if (-l $path) { |
730 | my $link_target = readlink($path); |
731 | die "Can't resolve link $path: $!" unless defined $link_target; |
732 | |
733 | return _vms_abs_path($link_target); |
734 | } |
735 | |
61729915 |
736 | # may need to turn foo.dir into [.foo] |
737 | my $pathified = VMS::Filespec::pathify($path); |
738 | $path = $pathified if defined $pathified; |
739 | |
96e4d5b1 |
740 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 |
741 | } |
68dc0745 |
742 | |
4633a7c4 |
743 | sub _os2_cwd { |
744 | $ENV{'PWD'} = `cmd /c cd`; |
39741d73 |
745 | chomp $ENV{'PWD'}; |
aa6b7957 |
746 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 |
747 | return $ENV{'PWD'}; |
748 | } |
749 | |
96e4d5b1 |
750 | sub _win32_cwd { |
cf2f24a4 |
751 | if (defined &DynaLoader::boot_DynaLoader) { |
752 | $ENV{'PWD'} = Win32::GetCwd(); |
753 | } |
754 | else { # miniperl |
755 | chomp($ENV{'PWD'} = `cd`); |
756 | } |
aa6b7957 |
757 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 |
758 | return $ENV{'PWD'}; |
759 | } |
760 | |
f6342b4b |
761 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd; |
68dc0745 |
762 | |
39e571d4 |
763 | sub _dos_cwd { |
764 | if (!defined &Dos::GetCwd) { |
765 | $ENV{'PWD'} = `command /c cd`; |
39741d73 |
766 | chomp $ENV{'PWD'}; |
aa6b7957 |
767 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 |
768 | } else { |
769 | $ENV{'PWD'} = Dos::GetCwd(); |
770 | } |
55497cff |
771 | return $ENV{'PWD'}; |
772 | } |
773 | |
7fbf1995 |
774 | sub _qnx_cwd { |
35b807ef |
775 | local $ENV{PATH} = ''; |
776 | local $ENV{CDPATH} = ''; |
777 | local $ENV{ENV} = ''; |
7fbf1995 |
778 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 |
779 | chomp $ENV{'PWD'}; |
7fbf1995 |
780 | return $ENV{'PWD'}; |
781 | } |
782 | |
783 | sub _qnx_abs_path { |
35b807ef |
784 | local $ENV{PATH} = ''; |
785 | local $ENV{CDPATH} = ''; |
786 | local $ENV{ENV} = ''; |
fa921dc6 |
787 | my $path = @_ ? shift : '.'; |
39741d73 |
788 | local *REALPATH; |
789 | |
99f36a73 |
790 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 |
791 | die "Can't open /usr/bin/fullpath: $!"; |
792 | my $realpath = <REALPATH>; |
793 | close REALPATH; |
794 | chomp $realpath; |
7fbf1995 |
795 | return $realpath; |
796 | } |
797 | |
ed79a026 |
798 | sub _epoc_cwd { |
799 | $ENV{'PWD'} = EPOC::getcwd(); |
800 | return $ENV{'PWD'}; |
801 | } |
802 | |
4633a7c4 |
803 | |
09122b95 |
804 | # Now that all the base-level functions are set up, alias the |
805 | # user-level functions to the right places |
806 | |
807 | if (exists $METHOD_MAP{$^O}) { |
808 | my $map = $METHOD_MAP{$^O}; |
809 | foreach my $name (keys %$map) { |
99f36a73 |
810 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 |
811 | no strict 'refs'; |
812 | *{$name} = \&{$map->{$name}}; |
813 | } |
55497cff |
814 | } |
4633a7c4 |
815 | |
99f36a73 |
816 | # In case the XS version doesn't load. |
817 | *abs_path = \&_perl_abs_path unless defined &abs_path; |
a7a23d71 |
818 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 |
819 | |
820 | # added function alias for those of us more |
821 | # used to the libc function. --tchrist 27-Jan-00 |
822 | *realpath = \&abs_path; |
4633a7c4 |
823 | |
a0d0e21e |
824 | 1; |