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1 | package Cwd; |
2 | ||
3 | =head1 NAME | |
4 | ||
5 | Cwd - get pathname of current working directory | |
6 | ||
7 | =head1 SYNOPSIS | |
8 | ||
9 | use Cwd; | |
10 | my $dir = getcwd; | |
11 | ||
12 | use Cwd 'abs_path'; | |
13 | my $abs_path = abs_path($file); | |
14 | ||
15 | =head1 DESCRIPTION | |
16 | ||
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. | |
20 | ||
21 | By default, it exports the functions cwd(), getcwd(), fastcwd(), and | |
22 | fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace. | |
23 | ||
24 | ||
25 | =head2 getcwd and friends | |
26 | ||
27 | Each of these functions are called without arguments and return the | |
28 | absolute path of the current working directory. | |
29 | ||
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 | ||
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(); | |
66 | ||
67 | The fastgetcwd() function is provided as a synonym for cwd(). | |
68 | ||
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 | ||
81 | =back | |
82 | ||
83 | ||
84 | =head2 abs_path and friends | |
85 | ||
86 | These functions are exported only on request. They each take a single | |
87 | argument and return the absolute pathname for it. If no argument is | |
88 | given they'll use the current working directory. | |
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 | ||
108 | my $abs_path = fast_abs_path($file); | |
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. | |
123 | ||
124 | ||
125 | =head1 NOTES | |
126 | ||
127 | =over 4 | |
128 | ||
129 | =item * | |
130 | ||
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 | ||
135 | =item * | |
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 | ||
144 | =head1 AUTHOR | |
145 | ||
146 | Originally by the perl5-porters. | |
147 | ||
148 | Maintained by Ken Williams <KWILLIAMS@cpan.org> | |
149 | ||
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 | ||
163 | =head1 SEE ALSO | |
164 | ||
165 | L<File::chdir> | |
166 | ||
167 | =cut | |
168 | ||
169 | use strict; | |
170 | use Exporter; | |
171 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); | |
172 | ||
173 | $VERSION = '3.12'; | |
174 | ||
175 | @ISA = qw/ Exporter /; | |
176 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); | |
177 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; | |
178 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); | |
179 | ||
180 | # sys_cwd may keep the builtin command | |
181 | ||
182 | # All the functionality of this module may provided by builtins, | |
183 | # there is no sense to process the rest of the file. | |
184 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? | |
185 | ||
186 | if ($^O eq 'os2') { | |
187 | local $^W = 0; | |
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 | ||
199 | return 1; | |
200 | } | |
201 | ||
202 | # If loading the XS stuff doesn't work, we can fall back to pure perl | |
203 | eval { | |
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 | } | |
212 | }; | |
213 | ||
214 | # Must be after the DynaLoader stuff: | |
215 | $VERSION = eval $VERSION; | |
216 | ||
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 | ||
290 | ||
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; | |
295 | foreach my $try ('/bin/pwd', | |
296 | '/usr/bin/pwd', | |
297 | '/QOpenSys/bin/pwd', # OS/400 PASE. | |
298 | ) { | |
299 | ||
300 | if( -x $try ) { | |
301 | $pwd_cmd = $try; | |
302 | last; | |
303 | } | |
304 | } | |
305 | unless ($pwd_cmd) { | |
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'; | |
310 | } | |
311 | ||
312 | # Lazy-load Carp | |
313 | sub _carp { require Carp; Carp::carp(@_) } | |
314 | sub _croak { require Carp; Carp::croak(@_) } | |
315 | ||
316 | # The 'natural and safe form' for UNIX (pwd may be setuid root) | |
317 | sub _backtick_pwd { | |
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 | ||
322 | my $cwd = `$pwd_cmd`; | |
323 | # Belt-and-suspenders in case someone said "undef $/". | |
324 | local $/ = "\n"; | |
325 | # `pwd` may fail e.g. if the disk is full | |
326 | chomp($cwd) if defined $cwd; | |
327 | $cwd; | |
328 | } | |
329 | ||
330 | # Since some ports may predefine cwd internally (e.g., NT) | |
331 | # we take care not to override an existing definition for cwd(). | |
332 | ||
333 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { | |
334 | # The pwd command is not available in some chroot(2)'ed environments | |
335 | my $sep = $Config::Config{path_sep} || ':'; | |
336 | my $os = $^O; # Protect $^O from tainting | |
337 | if( $os eq 'MacOS' || (defined $ENV{PATH} && | |
338 | $os ne 'MSWin32' && # no pwd on Windows | |
339 | grep { -x "$_/pwd" } split($sep, $ENV{PATH})) ) | |
340 | { | |
341 | *cwd = \&_backtick_pwd; | |
342 | } | |
343 | else { | |
344 | *cwd = \&getcwd; | |
345 | } | |
346 | } | |
347 | ||
348 | # set a reasonable (and very safe) default for fastgetcwd, in case it | |
349 | # isn't redefined later (20001212 rspier) | |
350 | *fastgetcwd = \&cwd; | |
351 | ||
352 | # By Brandon S. Allbery | |
353 | # | |
354 | # Usage: $cwd = getcwd(); | |
355 | ||
356 | sub getcwd | |
357 | { | |
358 | abs_path('.'); | |
359 | } | |
360 | ||
361 | ||
362 | # By John Bazik | |
363 | # | |
364 | # Usage: $cwd = &fastcwd; | |
365 | # | |
366 | # This is a faster version of getcwd. It's also more dangerous because | |
367 | # you might chdir out of a directory that you can't chdir back into. | |
368 | ||
369 | sub fastcwd_ { | |
370 | my($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. | |
399 | # Untaint it then check that we landed where we started. | |
400 | $path =~ /^(.*)\z/s # untaint | |
401 | && CORE::chdir($1) or return undef; | |
402 | ($cdev, $cino) = stat('.'); | |
403 | die "Unstable directory path, current directory changed unexpectedly" | |
404 | if $cdev != $orig_cdev || $cino != $orig_cino; | |
405 | $path; | |
406 | } | |
407 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } | |
408 | ||
409 | ||
410 | # Keeps track of current working directory in PWD environment var | |
411 | # Usage: | |
412 | # use Cwd 'chdir'; | |
413 | # chdir $newdir; | |
414 | ||
415 | my $chdir_init = 0; | |
416 | ||
417 | sub chdir_init { | |
418 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { | |
419 | my($dd,$di) = stat('.'); | |
420 | my($pd,$pi) = stat($ENV{'PWD'}); | |
421 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { | |
422 | $ENV{'PWD'} = cwd(); | |
423 | } | |
424 | } | |
425 | else { | |
426 | my $wd = cwd(); | |
427 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; | |
428 | $ENV{'PWD'} = $wd; | |
429 | } | |
430 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) | |
431 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { | |
432 | my($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 { | |
442 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) | |
443 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; | |
444 | chdir_init() unless $chdir_init; | |
445 | my $newpwd; | |
446 | if ($^O eq 'MSWin32') { | |
447 | # get the full path name *before* the chdir() | |
448 | $newpwd = Win32::GetFullPathName($newdir); | |
449 | } | |
450 | ||
451 | return 0 unless CORE::chdir $newdir; | |
452 | ||
453 | if ($^O eq 'VMS') { | |
454 | return $ENV{'PWD'} = $ENV{'DEFAULT'} | |
455 | } | |
456 | elsif ($^O eq 'MacOS') { | |
457 | return $ENV{'PWD'} = cwd(); | |
458 | } | |
459 | elsif ($^O eq 'MSWin32') { | |
460 | $ENV{'PWD'} = $newpwd; | |
461 | return 1; | |
462 | } | |
463 | ||
464 | if ($newdir =~ m#^/#s) { | |
465 | $ENV{'PWD'} = $newdir; | |
466 | } else { | |
467 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
468 | @curdir = ('') unless @curdir; | |
469 | my $component; | |
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 | } | |
477 | 1; | |
478 | } | |
479 | ||
480 | ||
481 | sub _perl_abs_path | |
482 | { | |
483 | my $start = @_ ? shift : '.'; | |
484 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
485 | ||
486 | unless (@cst = stat( $start )) | |
487 | { | |
488 | _carp("stat($start): $!"); | |
489 | return ''; | |
490 | } | |
491 | ||
492 | unless (-d _) { | |
493 | # Make sure we can be invoked on plain files, not just directories. | |
494 | # NOTE that this routine assumes that '/' is the only directory separator. | |
495 | ||
496 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} | |
497 | or return cwd() . '/' . $start; | |
498 | ||
499 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). | |
500 | if (-l $start) { | |
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 | ||
511 | return $dir ? abs_path($dir) . "/$file" : "/$file"; | |
512 | } | |
513 | ||
514 | $cwd = ''; | |
515 | $dotdots = $start; | |
516 | do | |
517 | { | |
518 | $dotdots .= '/..'; | |
519 | @pst = @cst; | |
520 | local *PARENT; | |
521 | unless (opendir(PARENT, $dotdots)) | |
522 | { | |
523 | _carp("opendir($dotdots): $!"); | |
524 | return ''; | |
525 | } | |
526 | unless (@cst = stat($dotdots)) | |
527 | { | |
528 | _carp("stat($dotdots): $!"); | |
529 | closedir(PARENT); | |
530 | return ''; | |
531 | } | |
532 | if ($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 | { | |
542 | _carp("readdir($dotdots): $!"); | |
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 | ||
559 | my $Curdir; | |
560 | sub fast_abs_path { | |
561 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage | |
562 | my $cwd = getcwd(); | |
563 | require File::Spec; | |
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 | ||
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 | ||
591 | return $dir eq File::Spec->rootdir | |
592 | ? File::Spec->catpath($vol, $dir, $file) | |
593 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; | |
594 | } | |
595 | ||
596 | if (!CORE::chdir($path)) { | |
597 | _croak("Cannot chdir to $path: $!"); | |
598 | } | |
599 | my $realpath = getcwd(); | |
600 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { | |
601 | _croak("Cannot chdir back to $cwd: $!"); | |
602 | } | |
603 | $realpath; | |
604 | } | |
605 | ||
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 | ||
610 | ||
611 | # --- PORTING SECTION --- | |
612 | ||
613 | # VMS: $ENV{'DEFAULT'} points to default directory at all times | |
614 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu | |
615 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined | |
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 | |
618 | # and directory seen by DCL after Perl exits, since the effects | |
619 | # the CRTL chdir() function persist only until Perl exits. | |
620 | ||
621 | sub _vms_cwd { | |
622 | return $ENV{'DEFAULT'}; | |
623 | } | |
624 | ||
625 | sub _vms_abs_path { | |
626 | return $ENV{'DEFAULT'} unless @_; | |
627 | ||
628 | # may need to turn foo.dir into [.foo] | |
629 | my $path = VMS::Filespec::pathify($_[0]); | |
630 | $path = $_[0] unless defined $path; | |
631 | ||
632 | return VMS::Filespec::rmsexpand($path); | |
633 | } | |
634 | ||
635 | sub _os2_cwd { | |
636 | $ENV{'PWD'} = `cmd /c cd`; | |
637 | chomp $ENV{'PWD'}; | |
638 | $ENV{'PWD'} =~ s:\\:/:g ; | |
639 | return $ENV{'PWD'}; | |
640 | } | |
641 | ||
642 | sub _win32_cwd { | |
643 | $ENV{'PWD'} = Win32::GetCwd(); | |
644 | $ENV{'PWD'} =~ s:\\:/:g ; | |
645 | return $ENV{'PWD'}; | |
646 | } | |
647 | ||
648 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_os2_cwd; | |
649 | ||
650 | sub _dos_cwd { | |
651 | if (!defined &Dos::GetCwd) { | |
652 | $ENV{'PWD'} = `command /c cd`; | |
653 | chomp $ENV{'PWD'}; | |
654 | $ENV{'PWD'} =~ s:\\:/:g ; | |
655 | } else { | |
656 | $ENV{'PWD'} = Dos::GetCwd(); | |
657 | } | |
658 | return $ENV{'PWD'}; | |
659 | } | |
660 | ||
661 | sub _qnx_cwd { | |
662 | local $ENV{PATH} = ''; | |
663 | local $ENV{CDPATH} = ''; | |
664 | local $ENV{ENV} = ''; | |
665 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; | |
666 | chomp $ENV{'PWD'}; | |
667 | return $ENV{'PWD'}; | |
668 | } | |
669 | ||
670 | sub _qnx_abs_path { | |
671 | local $ENV{PATH} = ''; | |
672 | local $ENV{CDPATH} = ''; | |
673 | local $ENV{ENV} = ''; | |
674 | my $path = @_ ? shift : '.'; | |
675 | local *REALPATH; | |
676 | ||
677 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or | |
678 | die "Can't open /usr/bin/fullpath: $!"; | |
679 | my $realpath = <REALPATH>; | |
680 | close REALPATH; | |
681 | chomp $realpath; | |
682 | return $realpath; | |
683 | } | |
684 | ||
685 | sub _epoc_cwd { | |
686 | $ENV{'PWD'} = EPOC::getcwd(); | |
687 | return $ENV{'PWD'}; | |
688 | } | |
689 | ||
690 | ||
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) { | |
697 | local $^W = 0; # assignments trigger 'subroutine redefined' warning | |
698 | no strict 'refs'; | |
699 | *{$name} = \&{$map->{$name}}; | |
700 | } | |
701 | } | |
702 | ||
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; | |
709 | ||
710 | 1; |