Commit | Line | Data |
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a0d0e21e | 1 | package Cwd; |
a0d0e21e | 2 | |
f06db76b AD |
3 | =head1 NAME |
4 | ||
902bacac | 5 | Cwd - get pathname of current working directory |
f06db76b AD |
6 | |
7 | =head1 SYNOPSIS | |
8 | ||
4633a7c4 | 9 | use Cwd; |
04929354 | 10 | my $dir = getcwd; |
4633a7c4 | 11 | |
04929354 MS |
12 | use Cwd 'abs_path'; |
13 | my $abs_path = abs_path($file); | |
f06db76b | 14 | |
04929354 | 15 | =head1 DESCRIPTION |
902bacac | 16 | |
04929354 MS |
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 MS |
27 | Each of these functions are called without arguments and return the |
28 | absolute path of the current working directory. | |
f06db76b | 29 | |
04929354 MS |
30 | =over 4 |
31 | ||
32 | =item getcwd | |
33 | ||
34 | my $cwd = getcwd(); | |
35 | ||
36 | Returns the current working directory. | |
37 | ||
fa52125f SP |
38 | Exposes the POSIX function getcwd(3) or re-implements it if it's not |
39 | available. | |
04929354 MS |
40 | |
41 | =item cwd | |
42 | ||
43 | my $cwd = cwd(); | |
44 | ||
d6ec5f13 | 45 | The cwd() is the most natural form for the current architecture. For |
04929354 MS |
46 | most systems it is identical to `pwd` (but without the trailing line |
47 | terminator). | |
48 | ||
04929354 MS |
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 | |
d6ec5f13 | 60 | that it started in. If it has changed it will C<die> with the message |
04929354 | 61 | "Unstable directory path, current directory changed |
d6ec5f13 | 62 | unexpectedly". That should never happen. |
04929354 MS |
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 RGS |
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 MS |
82 | =back |
83 | ||
902bacac | 84 | |
04929354 MS |
85 | =head2 abs_path and friends |
86 | ||
87 | These functions are exported only on request. They each take a single | |
3ee63918 MS |
88 | argument and return the absolute pathname for it. If no argument is |
89 | given they'll use the current working directory. | |
04929354 MS |
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 MS |
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 JH |
126 | =head1 NOTES |
127 | ||
128 | =over 4 | |
129 | ||
130 | =item * | |
131 | ||
c4a6f826 | 132 | Since the path separators are different on some operating systems ('/' |
04929354 MS |
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 JH |
137 | |
138 | Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()> | |
d6ec5f13 FC |
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 | |
4d6b4052 JH |
141 | C<fast_abs_path()>. |
142 | ||
143 | =back | |
144 | ||
02cc4877 NC |
145 | =head1 AUTHOR |
146 | ||
147 | Originally by the perl5-porters. | |
148 | ||
78321866 | 149 | Maintained by Ken Williams <KWILLIAMS@cpan.org> |
02cc4877 | 150 | |
99f36a73 RGS |
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 MS |
164 | =head1 SEE ALSO |
165 | ||
166 | L<File::chdir> | |
167 | ||
f06db76b AD |
168 | =cut |
169 | ||
b060a406 | 170 | use strict; |
a9939470 | 171 | use Exporter; |
99f36a73 RGS |
172 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); |
173 | ||
adf4621a | 174 | $VERSION = '3.45'; |
4a4ab19c | 175 | my $xs_version = $VERSION; |
3d2a0adf | 176 | $VERSION =~ tr/_//; |
96e4d5b1 | 177 | |
a9939470 NC |
178 | @ISA = qw/ Exporter /; |
179 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); | |
09122b95 | 180 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 | 181 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e | 182 | |
f5f423e4 IZ |
183 | # sys_cwd may keep the builtin command |
184 | ||
185 | # All the functionality of this module may provided by builtins, | |
186 | # there is no sense to process the rest of the file. | |
187 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? | |
188 | ||
a9939470 | 189 | if ($^O eq 'os2') { |
f5f423e4 | 190 | local $^W = 0; |
a9939470 NC |
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 IZ |
202 | return 1; |
203 | } | |
204 | ||
53e80d0b JM |
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'} || ''; | |
a7884731 | 225 | $unix_rpt = $env_unix_rpt =~ /^[ET1]/i; |
53e80d0b JM |
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'} || ''; | |
a7884731 | 238 | $efs = $env_efs =~ /^[ET1]/i; |
53e80d0b JM |
239 | } |
240 | return $efs; | |
241 | } | |
242 | ||
243 | ||
b04f6d36 | 244 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
07f43755 Z |
245 | unless (defined &getcwd) { |
246 | eval { | |
247 | if ( $] >= 5.006 ) { | |
248 | require XSLoader; | |
249 | XSLoader::load( __PACKAGE__, $xs_version); | |
250 | } else { | |
251 | require DynaLoader; | |
252 | push @ISA, 'DynaLoader'; | |
253 | __PACKAGE__->bootstrap( $xs_version ); | |
254 | } | |
255 | }; | |
256 | } | |
4633a7c4 | 257 | |
09122b95 RGS |
258 | # Big nasty table of function aliases |
259 | my %METHOD_MAP = | |
260 | ( | |
261 | VMS => | |
262 | { | |
263 | cwd => '_vms_cwd', | |
264 | getcwd => '_vms_cwd', | |
265 | fastcwd => '_vms_cwd', | |
266 | fastgetcwd => '_vms_cwd', | |
267 | abs_path => '_vms_abs_path', | |
268 | fast_abs_path => '_vms_abs_path', | |
269 | }, | |
270 | ||
271 | MSWin32 => | |
272 | { | |
273 | # We assume that &_NT_cwd is defined as an XSUB or in the core. | |
274 | cwd => '_NT_cwd', | |
275 | getcwd => '_NT_cwd', | |
276 | fastcwd => '_NT_cwd', | |
277 | fastgetcwd => '_NT_cwd', | |
278 | abs_path => 'fast_abs_path', | |
279 | realpath => 'fast_abs_path', | |
280 | }, | |
281 | ||
282 | dos => | |
283 | { | |
284 | cwd => '_dos_cwd', | |
285 | getcwd => '_dos_cwd', | |
286 | fastgetcwd => '_dos_cwd', | |
287 | fastcwd => '_dos_cwd', | |
288 | abs_path => 'fast_abs_path', | |
289 | }, | |
290 | ||
58ccccf6 | 291 | # QNX4. QNX6 has a $os of 'nto'. |
09122b95 RGS |
292 | qnx => |
293 | { | |
294 | cwd => '_qnx_cwd', | |
295 | getcwd => '_qnx_cwd', | |
296 | fastgetcwd => '_qnx_cwd', | |
297 | fastcwd => '_qnx_cwd', | |
298 | abs_path => '_qnx_abs_path', | |
299 | fast_abs_path => '_qnx_abs_path', | |
300 | }, | |
301 | ||
302 | cygwin => | |
303 | { | |
304 | getcwd => 'cwd', | |
305 | fastgetcwd => 'cwd', | |
306 | fastcwd => 'cwd', | |
307 | abs_path => 'fast_abs_path', | |
308 | realpath => 'fast_abs_path', | |
309 | }, | |
310 | ||
311 | epoc => | |
312 | { | |
313 | cwd => '_epoc_cwd', | |
314 | getcwd => '_epoc_cwd', | |
315 | fastgetcwd => '_epoc_cwd', | |
316 | fastcwd => '_epoc_cwd', | |
317 | abs_path => 'fast_abs_path', | |
318 | }, | |
319 | ||
320 | MacOS => | |
321 | { | |
322 | getcwd => 'cwd', | |
323 | fastgetcwd => 'cwd', | |
324 | fastcwd => 'cwd', | |
325 | abs_path => 'fast_abs_path', | |
326 | }, | |
327 | ); | |
328 | ||
329 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; | |
09122b95 | 330 | |
96e4d5b1 | 331 | |
3547aa9a MS |
332 | # Find the pwd command in the expected locations. We assume these |
333 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} | |
334 | # so everything works under taint mode. | |
335 | my $pwd_cmd; | |
889f7a4f RGS |
336 | foreach my $try ('/bin/pwd', |
337 | '/usr/bin/pwd', | |
338 | '/QOpenSys/bin/pwd', # OS/400 PASE. | |
339 | ) { | |
340 | ||
3547aa9a MS |
341 | if( -x $try ) { |
342 | $pwd_cmd = $try; | |
343 | last; | |
344 | } | |
345 | } | |
fa52125f | 346 | my $found_pwd_cmd = defined($pwd_cmd); |
522b859a | 347 | unless ($pwd_cmd) { |
2d3da5df | 348 | # Isn't this wrong? _backtick_pwd() will fail if someone has |
889f7a4f RGS |
349 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? |
350 | # See [perl #16774]. --jhi | |
351 | $pwd_cmd = 'pwd'; | |
522b859a | 352 | } |
3547aa9a | 353 | |
a9939470 NC |
354 | # Lazy-load Carp |
355 | sub _carp { require Carp; Carp::carp(@_) } | |
356 | sub _croak { require Carp; Carp::croak(@_) } | |
357 | ||
3547aa9a | 358 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 | 359 | sub _backtick_pwd { |
f6342b4b RGS |
360 | # Localize %ENV entries in a way that won't create new hash keys |
361 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); | |
362 | local @ENV{@localize}; | |
363 | ||
3547aa9a | 364 | my $cwd = `$pwd_cmd`; |
ac3b20cb | 365 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f | 366 | local $/ = "\n"; |
ac3b20cb | 367 | # `pwd` may fail e.g. if the disk is full |
7e03f963 | 368 | chomp($cwd) if defined $cwd; |
4633a7c4 | 369 | $cwd; |
8b88ae92 | 370 | } |
4633a7c4 LW |
371 | |
372 | # Since some ports may predefine cwd internally (e.g., NT) | |
373 | # we take care not to override an existing definition for cwd(). | |
374 | ||
09122b95 | 375 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd | 376 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 | 377 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 | 378 | my $os = $^O; # Protect $^O from tainting |
fa52125f SP |
379 | |
380 | ||
381 | # Try again to find a pwd, this time searching the whole PATH. | |
382 | if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows | |
383 | my @candidates = split($sep, $ENV{PATH}); | |
384 | while (!$found_pwd_cmd and @candidates) { | |
385 | my $candidate = shift @candidates; | |
386 | $found_pwd_cmd = 1 if -x "$candidate/pwd"; | |
387 | } | |
388 | } | |
389 | ||
390 | # MacOS has some special magic to make `pwd` work. | |
391 | if( $os eq 'MacOS' || $found_pwd_cmd ) | |
73b801a6 | 392 | { |
ea54c8bd EC |
393 | *cwd = \&_backtick_pwd; |
394 | } | |
395 | else { | |
396 | *cwd = \&getcwd; | |
397 | } | |
398 | } | |
a0d0e21e | 399 | |
23bb49fa SP |
400 | if ($^O eq 'cygwin') { |
401 | # We need to make sure cwd() is called with no args, because it's | |
402 | # got an arg-less prototype and will die if args are present. | |
403 | local $^W = 0; | |
404 | my $orig_cwd = \&cwd; | |
405 | *cwd = sub { &$orig_cwd() } | |
406 | } | |
407 | ||
408 | ||
1f4f94f5 RS |
409 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
410 | # isn't redefined later (20001212 rspier) | |
411 | *fastgetcwd = \&cwd; | |
748a9306 | 412 | |
c47834cd RGS |
413 | # A non-XS version of getcwd() - also used to bootstrap the perl build |
414 | # process, when miniperl is running and no XS loading happens. | |
a7a23d71 NC |
415 | sub _perl_getcwd |
416 | { | |
417 | abs_path('.'); | |
418 | } | |
419 | ||
a0c9c202 JH |
420 | # By John Bazik |
421 | # | |
422 | # Usage: $cwd = &fastcwd; | |
423 | # | |
424 | # This is a faster version of getcwd. It's also more dangerous because | |
425 | # you might chdir out of a directory that you can't chdir back into. | |
426 | ||
99f36a73 | 427 | sub fastcwd_ { |
a0c9c202 JH |
428 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
429 | my(@path, $path); | |
430 | local(*DIR); | |
431 | ||
432 | my($orig_cdev, $orig_cino) = stat('.'); | |
433 | ($cdev, $cino) = ($orig_cdev, $orig_cino); | |
434 | for (;;) { | |
435 | my $direntry; | |
436 | ($odev, $oino) = ($cdev, $cino); | |
437 | CORE::chdir('..') || return undef; | |
438 | ($cdev, $cino) = stat('.'); | |
439 | last if $odev == $cdev && $oino == $cino; | |
440 | opendir(DIR, '.') || return undef; | |
441 | for (;;) { | |
442 | $direntry = readdir(DIR); | |
443 | last unless defined $direntry; | |
444 | next if $direntry eq '.'; | |
445 | next if $direntry eq '..'; | |
446 | ||
447 | ($tdev, $tino) = lstat($direntry); | |
448 | last unless $tdev != $odev || $tino != $oino; | |
449 | } | |
450 | closedir(DIR); | |
451 | return undef unless defined $direntry; # should never happen | |
452 | unshift(@path, $direntry); | |
453 | } | |
454 | $path = '/' . join('/', @path); | |
455 | if ($^O eq 'apollo') { $path = "/".$path; } | |
456 | # At this point $path may be tainted (if tainting) and chdir would fail. | |
248785eb RGS |
457 | # Untaint it then check that we landed where we started. |
458 | $path =~ /^(.*)\z/s # untaint | |
459 | && CORE::chdir($1) or return undef; | |
a0c9c202 JH |
460 | ($cdev, $cino) = stat('.'); |
461 | die "Unstable directory path, current directory changed unexpectedly" | |
462 | if $cdev != $orig_cdev || $cino != $orig_cino; | |
463 | $path; | |
464 | } | |
99f36a73 | 465 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 JH |
466 | |
467 | ||
4633a7c4 | 468 | # Keeps track of current working directory in PWD environment var |
a0d0e21e LW |
469 | # Usage: |
470 | # use Cwd 'chdir'; | |
471 | # chdir $newdir; | |
472 | ||
4633a7c4 | 473 | my $chdir_init = 0; |
a0d0e21e | 474 | |
4633a7c4 | 475 | sub chdir_init { |
3b8e3443 | 476 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e LW |
477 | my($dd,$di) = stat('.'); |
478 | my($pd,$pi) = stat($ENV{'PWD'}); | |
479 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { | |
4633a7c4 | 480 | $ENV{'PWD'} = cwd(); |
a0d0e21e LW |
481 | } |
482 | } | |
483 | else { | |
3b8e3443 GS |
484 | my $wd = cwd(); |
485 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; | |
486 | $ENV{'PWD'} = $wd; | |
a0d0e21e | 487 | } |
4633a7c4 | 488 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 | 489 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e LW |
490 | my($pd,$pi) = stat($2); |
491 | my($dd,$di) = stat($1); | |
492 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { | |
493 | $ENV{'PWD'}="$2$3"; | |
494 | } | |
495 | } | |
496 | $chdir_init = 1; | |
497 | } | |
498 | ||
499 | sub chdir { | |
22978713 | 500 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
3b8e3443 | 501 | $newdir =~ s|///*|/|g unless $^O eq 'MSWin32'; |
a0d0e21e | 502 | chdir_init() unless $chdir_init; |
4ffa1610 JH |
503 | my $newpwd; |
504 | if ($^O eq 'MSWin32') { | |
505 | # get the full path name *before* the chdir() | |
506 | $newpwd = Win32::GetFullPathName($newdir); | |
507 | } | |
508 | ||
4633a7c4 | 509 | return 0 unless CORE::chdir $newdir; |
4ffa1610 | 510 | |
3b8e3443 GS |
511 | if ($^O eq 'VMS') { |
512 | return $ENV{'PWD'} = $ENV{'DEFAULT'} | |
513 | } | |
4aecb5b5 JH |
514 | elsif ($^O eq 'MacOS') { |
515 | return $ENV{'PWD'} = cwd(); | |
516 | } | |
3b8e3443 | 517 | elsif ($^O eq 'MSWin32') { |
4ffa1610 | 518 | $ENV{'PWD'} = $newpwd; |
3b8e3443 GS |
519 | return 1; |
520 | } | |
748a9306 | 521 | |
e9475de8 SP |
522 | if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in |
523 | $ENV{'PWD'} = cwd(); | |
524 | } elsif ($newdir =~ m#^/#s) { | |
a0d0e21e | 525 | $ENV{'PWD'} = $newdir; |
4633a7c4 LW |
526 | } else { |
527 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
528 | @curdir = ('') unless @curdir; | |
529 | my $component; | |
a0d0e21e LW |
530 | foreach $component (split(m#/#, $newdir)) { |
531 | next if $component eq '.'; | |
532 | pop(@curdir),next if $component eq '..'; | |
533 | push(@curdir,$component); | |
534 | } | |
535 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
536 | } | |
4633a7c4 | 537 | 1; |
a0d0e21e LW |
538 | } |
539 | ||
a0c9c202 | 540 | |
99f36a73 | 541 | sub _perl_abs_path |
a0c9c202 JH |
542 | { |
543 | my $start = @_ ? shift : '.'; | |
544 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
545 | ||
546 | unless (@cst = stat( $start )) | |
547 | { | |
a9939470 | 548 | _carp("stat($start): $!"); |
a0c9c202 JH |
549 | return ''; |
550 | } | |
09122b95 RGS |
551 | |
552 | unless (-d _) { | |
553 | # Make sure we can be invoked on plain files, not just directories. | |
554 | # NOTE that this routine assumes that '/' is the only directory separator. | |
555 | ||
556 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} | |
557 | or return cwd() . '/' . $start; | |
558 | ||
275e8705 RGS |
559 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
560 | if (-l $start) { | |
09122b95 RGS |
561 | my $link_target = readlink($start); |
562 | die "Can't resolve link $start: $!" unless defined $link_target; | |
563 | ||
564 | require File::Spec; | |
565 | $link_target = $dir . '/' . $link_target | |
566 | unless File::Spec->file_name_is_absolute($link_target); | |
567 | ||
568 | return abs_path($link_target); | |
569 | } | |
570 | ||
99f36a73 | 571 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 RGS |
572 | } |
573 | ||
a0c9c202 JH |
574 | $cwd = ''; |
575 | $dotdots = $start; | |
576 | do | |
577 | { | |
578 | $dotdots .= '/..'; | |
579 | @pst = @cst; | |
a25ef67d | 580 | local *PARENT; |
a0c9c202 JH |
581 | unless (opendir(PARENT, $dotdots)) |
582 | { | |
bf7c0a3d | 583 | # probably a permissions issue. Try the native command. |
cdce0d84 | 584 | require File::Spec; |
bf7c0a3d | 585 | return File::Spec->rel2abs( $start, _backtick_pwd() ); |
a0c9c202 JH |
586 | } |
587 | unless (@cst = stat($dotdots)) | |
588 | { | |
a9939470 | 589 | _carp("stat($dotdots): $!"); |
a0c9c202 JH |
590 | closedir(PARENT); |
591 | return ''; | |
592 | } | |
593 | if ($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 JH |
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 MS |
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. | |
9f28c638 JB |
629 | ($path) = $path =~ /(.*)/s; |
630 | ($cwd) = $cwd =~ /(.*)/s; | |
3ee63918 | 631 | |
09122b95 RGS |
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 $dir eq File::Spec->rootdir |
99f36a73 RGS |
653 | ? File::Spec->catpath($vol, $dir, $file) |
654 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; | |
09122b95 RGS |
655 | } |
656 | ||
e2ba406b | 657 | if (!CORE::chdir($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 NIS |
665 | } |
666 | ||
e4c51978 GS |
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 LW |
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 NIS |
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 LW |
679 | # and directory seen by DCL after Perl exits, since the effects |
680 | # the CRTL chdir() function persist only until Perl exits. | |
4633a7c4 LW |
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 JM |
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 SP |
715 | } |
716 | ||
717 | # VMS format | |
718 | ||
53e80d0b | 719 | my $new_path = VMS::Filespec::vmsrealpath($path); |
bf7c0a3d SP |
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 JM |
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 CB |
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 LW |
743 | sub _os2_cwd { |
744 | $ENV{'PWD'} = `cmd /c cd`; | |
39741d73 | 745 | chomp $ENV{'PWD'}; |
aa6b7957 | 746 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 LW |
747 | return $ENV{'PWD'}; |
748 | } | |
749 | ||
8440aeb0 | 750 | sub _win32_cwd_simple { |
751 | $ENV{'PWD'} = `cd`; | |
752 | chomp $ENV{'PWD'}; | |
753 | $ENV{'PWD'} =~ s:\\:/:g ; | |
754 | return $ENV{'PWD'}; | |
755 | } | |
756 | ||
96e4d5b1 | 757 | sub _win32_cwd { |
5ec06e76 NC |
758 | # Need to avoid taking any sort of reference to the typeglob or the code in |
759 | # the optree, so that this tests the runtime state of things, as the | |
760 | # ExtUtils::MakeMaker tests for "miniperl" need to be able to fake things at | |
761 | # runtime by deleting the subroutine. *foo{THING} syntax on a symbol table | |
762 | # lookup avoids needing a string eval, which has been reported to cause | |
763 | # problems (for reasons that we haven't been able to get to the bottom of - | |
764 | # rt.cpan.org #56225) | |
765 | if (*{$DynaLoader::{boot_DynaLoader}}{CODE}) { | |
cf2f24a4 JD |
766 | $ENV{'PWD'} = Win32::GetCwd(); |
767 | } | |
768 | else { # miniperl | |
769 | chomp($ENV{'PWD'} = `cd`); | |
770 | } | |
aa6b7957 | 771 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 | 772 | return $ENV{'PWD'}; |
773 | } | |
774 | ||
8440aeb0 | 775 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_win32_cwd_simple; |
68dc0745 | 776 | |
39e571d4 LM |
777 | sub _dos_cwd { |
778 | if (!defined &Dos::GetCwd) { | |
779 | $ENV{'PWD'} = `command /c cd`; | |
39741d73 | 780 | chomp $ENV{'PWD'}; |
aa6b7957 | 781 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 LM |
782 | } else { |
783 | $ENV{'PWD'} = Dos::GetCwd(); | |
784 | } | |
55497cff | 785 | return $ENV{'PWD'}; |
786 | } | |
787 | ||
7fbf1995 | 788 | sub _qnx_cwd { |
35b807ef NA |
789 | local $ENV{PATH} = ''; |
790 | local $ENV{CDPATH} = ''; | |
791 | local $ENV{ENV} = ''; | |
7fbf1995 | 792 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 | 793 | chomp $ENV{'PWD'}; |
7fbf1995 NA |
794 | return $ENV{'PWD'}; |
795 | } | |
796 | ||
797 | sub _qnx_abs_path { | |
35b807ef NA |
798 | local $ENV{PATH} = ''; |
799 | local $ENV{CDPATH} = ''; | |
800 | local $ENV{ENV} = ''; | |
fa921dc6 | 801 | my $path = @_ ? shift : '.'; |
39741d73 MS |
802 | local *REALPATH; |
803 | ||
99f36a73 | 804 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 MS |
805 | die "Can't open /usr/bin/fullpath: $!"; |
806 | my $realpath = <REALPATH>; | |
807 | close REALPATH; | |
808 | chomp $realpath; | |
7fbf1995 NA |
809 | return $realpath; |
810 | } | |
811 | ||
ed79a026 OF |
812 | sub _epoc_cwd { |
813 | $ENV{'PWD'} = EPOC::getcwd(); | |
814 | return $ENV{'PWD'}; | |
815 | } | |
816 | ||
4633a7c4 | 817 | |
09122b95 RGS |
818 | # Now that all the base-level functions are set up, alias the |
819 | # user-level functions to the right places | |
820 | ||
821 | if (exists $METHOD_MAP{$^O}) { | |
822 | my $map = $METHOD_MAP{$^O}; | |
823 | foreach my $name (keys %$map) { | |
99f36a73 | 824 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 RGS |
825 | no strict 'refs'; |
826 | *{$name} = \&{$map->{$name}}; | |
827 | } | |
55497cff | 828 | } |
4633a7c4 | 829 | |
99f36a73 RGS |
830 | # In case the XS version doesn't load. |
831 | *abs_path = \&_perl_abs_path unless defined &abs_path; | |
a7a23d71 | 832 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 RGS |
833 | |
834 | # added function alias for those of us more | |
835 | # used to the libc function. --tchrist 27-Jan-00 | |
836 | *realpath = \&abs_path; | |
4633a7c4 | 837 | |
a0d0e21e | 838 | 1; |