Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | package Cwd; |
b060a406 | 2 | use strict; |
a9939470 | 3 | use Exporter; |
99f36a73 RGS |
4 | use vars qw(@ISA @EXPORT @EXPORT_OK $VERSION); |
5 | ||
abec5bed | 6 | $VERSION = '3.56'; |
4a4ab19c | 7 | my $xs_version = $VERSION; |
3d2a0adf | 8 | $VERSION =~ tr/_//; |
96e4d5b1 | 9 | |
a9939470 NC |
10 | @ISA = qw/ Exporter /; |
11 | @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); | |
09122b95 | 12 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
a9939470 | 13 | @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e | 14 | |
f5f423e4 IZ |
15 | # sys_cwd may keep the builtin command |
16 | ||
17 | # All the functionality of this module may provided by builtins, | |
18 | # there is no sense to process the rest of the file. | |
19 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? | |
20 | ||
a9939470 | 21 | if ($^O eq 'os2') { |
f5f423e4 | 22 | local $^W = 0; |
a9939470 NC |
23 | |
24 | *cwd = defined &sys_cwd ? \&sys_cwd : \&_os2_cwd; | |
25 | *getcwd = \&cwd; | |
26 | *fastgetcwd = \&cwd; | |
27 | *fastcwd = \&cwd; | |
28 | ||
29 | *fast_abs_path = \&sys_abspath if defined &sys_abspath; | |
30 | *abs_path = \&fast_abs_path; | |
31 | *realpath = \&fast_abs_path; | |
32 | *fast_realpath = \&fast_abs_path; | |
33 | ||
f5f423e4 IZ |
34 | return 1; |
35 | } | |
36 | ||
53e80d0b JM |
37 | # Need to look up the feature settings on VMS. The preferred way is to use the |
38 | # VMS::Feature module, but that may not be available to dual life modules. | |
39 | ||
40 | my $use_vms_feature; | |
41 | BEGIN { | |
42 | if ($^O eq 'VMS') { | |
43 | if (eval { local $SIG{__DIE__}; require VMS::Feature; }) { | |
44 | $use_vms_feature = 1; | |
45 | } | |
46 | } | |
47 | } | |
48 | ||
49 | # Need to look up the UNIX report mode. This may become a dynamic mode | |
50 | # in the future. | |
51 | sub _vms_unix_rpt { | |
52 | my $unix_rpt; | |
53 | if ($use_vms_feature) { | |
54 | $unix_rpt = VMS::Feature::current("filename_unix_report"); | |
55 | } else { | |
56 | my $env_unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || ''; | |
a7884731 | 57 | $unix_rpt = $env_unix_rpt =~ /^[ET1]/i; |
53e80d0b JM |
58 | } |
59 | return $unix_rpt; | |
60 | } | |
61 | ||
62 | # Need to look up the EFS character set mode. This may become a dynamic | |
63 | # mode in the future. | |
64 | sub _vms_efs { | |
65 | my $efs; | |
66 | if ($use_vms_feature) { | |
67 | $efs = VMS::Feature::current("efs_charset"); | |
68 | } else { | |
69 | my $env_efs = $ENV{'DECC$EFS_CHARSET'} || ''; | |
a7884731 | 70 | $efs = $env_efs =~ /^[ET1]/i; |
53e80d0b JM |
71 | } |
72 | return $efs; | |
73 | } | |
74 | ||
75 | ||
b04f6d36 | 76 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
96dcbc37 DD |
77 | if(! defined &getcwd && defined &DynaLoader::boot_DynaLoader) { |
78 | eval {#eval is questionable since we are handling potential errors like | |
ef47896b | 79 | #"Cwd object version 3.48 does not match bootstrap parameter 3.50 |
96dcbc37 | 80 | #at lib/DynaLoader.pm line 216." by having this eval |
07f43755 Z |
81 | if ( $] >= 5.006 ) { |
82 | require XSLoader; | |
83 | XSLoader::load( __PACKAGE__, $xs_version); | |
84 | } else { | |
85 | require DynaLoader; | |
86 | push @ISA, 'DynaLoader'; | |
87 | __PACKAGE__->bootstrap( $xs_version ); | |
88 | } | |
89 | }; | |
90 | } | |
4633a7c4 | 91 | |
09122b95 RGS |
92 | # Big nasty table of function aliases |
93 | my %METHOD_MAP = | |
94 | ( | |
95 | VMS => | |
96 | { | |
97 | cwd => '_vms_cwd', | |
98 | getcwd => '_vms_cwd', | |
99 | fastcwd => '_vms_cwd', | |
100 | fastgetcwd => '_vms_cwd', | |
101 | abs_path => '_vms_abs_path', | |
102 | fast_abs_path => '_vms_abs_path', | |
103 | }, | |
104 | ||
105 | MSWin32 => | |
106 | { | |
107 | # We assume that &_NT_cwd is defined as an XSUB or in the core. | |
108 | cwd => '_NT_cwd', | |
109 | getcwd => '_NT_cwd', | |
110 | fastcwd => '_NT_cwd', | |
111 | fastgetcwd => '_NT_cwd', | |
112 | abs_path => 'fast_abs_path', | |
113 | realpath => 'fast_abs_path', | |
114 | }, | |
115 | ||
116 | dos => | |
117 | { | |
118 | cwd => '_dos_cwd', | |
119 | getcwd => '_dos_cwd', | |
120 | fastgetcwd => '_dos_cwd', | |
121 | fastcwd => '_dos_cwd', | |
122 | abs_path => 'fast_abs_path', | |
123 | }, | |
124 | ||
58ccccf6 | 125 | # QNX4. QNX6 has a $os of 'nto'. |
09122b95 RGS |
126 | qnx => |
127 | { | |
128 | cwd => '_qnx_cwd', | |
129 | getcwd => '_qnx_cwd', | |
130 | fastgetcwd => '_qnx_cwd', | |
131 | fastcwd => '_qnx_cwd', | |
132 | abs_path => '_qnx_abs_path', | |
133 | fast_abs_path => '_qnx_abs_path', | |
134 | }, | |
135 | ||
136 | cygwin => | |
137 | { | |
138 | getcwd => 'cwd', | |
139 | fastgetcwd => 'cwd', | |
140 | fastcwd => 'cwd', | |
141 | abs_path => 'fast_abs_path', | |
142 | realpath => 'fast_abs_path', | |
143 | }, | |
144 | ||
145 | epoc => | |
146 | { | |
147 | cwd => '_epoc_cwd', | |
148 | getcwd => '_epoc_cwd', | |
149 | fastgetcwd => '_epoc_cwd', | |
150 | fastcwd => '_epoc_cwd', | |
151 | abs_path => 'fast_abs_path', | |
152 | }, | |
153 | ||
154 | MacOS => | |
155 | { | |
156 | getcwd => 'cwd', | |
157 | fastgetcwd => 'cwd', | |
158 | fastcwd => 'cwd', | |
159 | abs_path => 'fast_abs_path', | |
160 | }, | |
161 | ); | |
162 | ||
163 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; | |
09122b95 | 164 | |
96e4d5b1 | 165 | |
3547aa9a MS |
166 | # Find the pwd command in the expected locations. We assume these |
167 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} | |
168 | # so everything works under taint mode. | |
169 | my $pwd_cmd; | |
f4eedc6b DD |
170 | if($^O ne 'MSWin32') { |
171 | foreach my $try ('/bin/pwd', | |
172 | '/usr/bin/pwd', | |
173 | '/QOpenSys/bin/pwd', # OS/400 PASE. | |
174 | ) { | |
175 | if( -x $try ) { | |
176 | $pwd_cmd = $try; | |
177 | last; | |
178 | } | |
3547aa9a MS |
179 | } |
180 | } | |
b2fc9074 BF |
181 | |
182 | # Android has a built-in pwd. Using $pwd_cmd will DTRT if | |
183 | # this perl was compiled with -Dd_useshellcmds, which is the | |
184 | # default for Android, but the block below is needed for the | |
185 | # miniperl running on the host when cross-compiling, and | |
186 | # potentially for native builds with -Ud_useshellcmds. | |
187 | if ($^O =~ /android/) { | |
188 | # If targetsh is executable, then we're either a full | |
189 | # perl, or a miniperl for a native build. | |
190 | if (-x $Config::Config{targetsh}) { | |
191 | $pwd_cmd = "$Config::Config{targetsh} -c pwd" | |
192 | } | |
193 | else { | |
e7d73da9 BF |
194 | my $sh = $Config::Config{sh} || (-x '/system/bin/sh' ? '/system/bin/sh' : 'sh'); |
195 | $pwd_cmd = "$sh -c pwd" | |
b2fc9074 BF |
196 | } |
197 | } | |
198 | ||
fa52125f | 199 | my $found_pwd_cmd = defined($pwd_cmd); |
522b859a | 200 | unless ($pwd_cmd) { |
2d3da5df | 201 | # Isn't this wrong? _backtick_pwd() will fail if someone has |
889f7a4f RGS |
202 | # pwd in their path but it is not /bin/pwd or /usr/bin/pwd? |
203 | # See [perl #16774]. --jhi | |
204 | $pwd_cmd = 'pwd'; | |
522b859a | 205 | } |
3547aa9a | 206 | |
a9939470 NC |
207 | # Lazy-load Carp |
208 | sub _carp { require Carp; Carp::carp(@_) } | |
209 | sub _croak { require Carp; Carp::croak(@_) } | |
210 | ||
3547aa9a | 211 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 | 212 | sub _backtick_pwd { |
f6342b4b RGS |
213 | # Localize %ENV entries in a way that won't create new hash keys |
214 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV); | |
215 | local @ENV{@localize}; | |
216 | ||
3547aa9a | 217 | my $cwd = `$pwd_cmd`; |
ac3b20cb | 218 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f | 219 | local $/ = "\n"; |
ac3b20cb | 220 | # `pwd` may fail e.g. if the disk is full |
7e03f963 | 221 | chomp($cwd) if defined $cwd; |
4633a7c4 | 222 | $cwd; |
8b88ae92 | 223 | } |
4633a7c4 LW |
224 | |
225 | # Since some ports may predefine cwd internally (e.g., NT) | |
226 | # we take care not to override an existing definition for cwd(). | |
227 | ||
09122b95 | 228 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
ea54c8bd | 229 | # The pwd command is not available in some chroot(2)'ed environments |
09122b95 | 230 | my $sep = $Config::Config{path_sep} || ':'; |
60598624 | 231 | my $os = $^O; # Protect $^O from tainting |
fa52125f SP |
232 | |
233 | ||
234 | # Try again to find a pwd, this time searching the whole PATH. | |
235 | if (defined $ENV{PATH} and $os ne 'MSWin32') { # no pwd on Windows | |
236 | my @candidates = split($sep, $ENV{PATH}); | |
237 | while (!$found_pwd_cmd and @candidates) { | |
238 | my $candidate = shift @candidates; | |
239 | $found_pwd_cmd = 1 if -x "$candidate/pwd"; | |
240 | } | |
241 | } | |
242 | ||
243 | # MacOS has some special magic to make `pwd` work. | |
244 | if( $os eq 'MacOS' || $found_pwd_cmd ) | |
73b801a6 | 245 | { |
ea54c8bd EC |
246 | *cwd = \&_backtick_pwd; |
247 | } | |
248 | else { | |
249 | *cwd = \&getcwd; | |
250 | } | |
251 | } | |
a0d0e21e | 252 | |
23bb49fa SP |
253 | if ($^O eq 'cygwin') { |
254 | # We need to make sure cwd() is called with no args, because it's | |
255 | # got an arg-less prototype and will die if args are present. | |
256 | local $^W = 0; | |
257 | my $orig_cwd = \&cwd; | |
258 | *cwd = sub { &$orig_cwd() } | |
259 | } | |
260 | ||
261 | ||
1f4f94f5 RS |
262 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
263 | # isn't redefined later (20001212 rspier) | |
264 | *fastgetcwd = \&cwd; | |
748a9306 | 265 | |
c47834cd RGS |
266 | # A non-XS version of getcwd() - also used to bootstrap the perl build |
267 | # process, when miniperl is running and no XS loading happens. | |
a7a23d71 NC |
268 | sub _perl_getcwd |
269 | { | |
270 | abs_path('.'); | |
271 | } | |
272 | ||
a0c9c202 JH |
273 | # By John Bazik |
274 | # | |
275 | # Usage: $cwd = &fastcwd; | |
276 | # | |
277 | # This is a faster version of getcwd. It's also more dangerous because | |
278 | # you might chdir out of a directory that you can't chdir back into. | |
279 | ||
99f36a73 | 280 | sub fastcwd_ { |
a0c9c202 JH |
281 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
282 | my(@path, $path); | |
283 | local(*DIR); | |
284 | ||
285 | my($orig_cdev, $orig_cino) = stat('.'); | |
286 | ($cdev, $cino) = ($orig_cdev, $orig_cino); | |
287 | for (;;) { | |
288 | my $direntry; | |
289 | ($odev, $oino) = ($cdev, $cino); | |
290 | CORE::chdir('..') || return undef; | |
291 | ($cdev, $cino) = stat('.'); | |
292 | last if $odev == $cdev && $oino == $cino; | |
293 | opendir(DIR, '.') || return undef; | |
294 | for (;;) { | |
295 | $direntry = readdir(DIR); | |
296 | last unless defined $direntry; | |
297 | next if $direntry eq '.'; | |
298 | next if $direntry eq '..'; | |
299 | ||
300 | ($tdev, $tino) = lstat($direntry); | |
301 | last unless $tdev != $odev || $tino != $oino; | |
302 | } | |
303 | closedir(DIR); | |
304 | return undef unless defined $direntry; # should never happen | |
305 | unshift(@path, $direntry); | |
306 | } | |
307 | $path = '/' . join('/', @path); | |
308 | if ($^O eq 'apollo') { $path = "/".$path; } | |
309 | # At this point $path may be tainted (if tainting) and chdir would fail. | |
248785eb RGS |
310 | # Untaint it then check that we landed where we started. |
311 | $path =~ /^(.*)\z/s # untaint | |
312 | && CORE::chdir($1) or return undef; | |
a0c9c202 JH |
313 | ($cdev, $cino) = stat('.'); |
314 | die "Unstable directory path, current directory changed unexpectedly" | |
315 | if $cdev != $orig_cdev || $cino != $orig_cino; | |
316 | $path; | |
317 | } | |
99f36a73 | 318 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 JH |
319 | |
320 | ||
4633a7c4 | 321 | # Keeps track of current working directory in PWD environment var |
a0d0e21e LW |
322 | # Usage: |
323 | # use Cwd 'chdir'; | |
324 | # chdir $newdir; | |
325 | ||
4633a7c4 | 326 | my $chdir_init = 0; |
a0d0e21e | 327 | |
4633a7c4 | 328 | sub chdir_init { |
3b8e3443 | 329 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e LW |
330 | my($dd,$di) = stat('.'); |
331 | my($pd,$pi) = stat($ENV{'PWD'}); | |
332 | if (!defined $dd or !defined $pd or $di != $pi or $dd != $pd) { | |
4633a7c4 | 333 | $ENV{'PWD'} = cwd(); |
a0d0e21e LW |
334 | } |
335 | } | |
336 | else { | |
3b8e3443 GS |
337 | my $wd = cwd(); |
338 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; | |
339 | $ENV{'PWD'} = $wd; | |
a0d0e21e | 340 | } |
4633a7c4 | 341 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 | 342 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e LW |
343 | my($pd,$pi) = stat($2); |
344 | my($dd,$di) = stat($1); | |
345 | if (defined $pd and defined $dd and $di == $pi and $dd == $pd) { | |
346 | $ENV{'PWD'}="$2$3"; | |
347 | } | |
348 | } | |
349 | $chdir_init = 1; | |
350 | } | |
351 | ||
352 | sub chdir { | |
22978713 | 353 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
faa5d6ec TC |
354 | if ($^O eq "cygwin") { |
355 | $newdir =~ s|\A///+|//|; | |
356 | $newdir =~ s|(?<=[^/])//+|/|g; | |
357 | } | |
358 | elsif ($^O ne 'MSWin32') { | |
359 | $newdir =~ s|///*|/|g; | |
360 | } | |
a0d0e21e | 361 | chdir_init() unless $chdir_init; |
4ffa1610 JH |
362 | my $newpwd; |
363 | if ($^O eq 'MSWin32') { | |
364 | # get the full path name *before* the chdir() | |
365 | $newpwd = Win32::GetFullPathName($newdir); | |
366 | } | |
367 | ||
4633a7c4 | 368 | return 0 unless CORE::chdir $newdir; |
4ffa1610 | 369 | |
3b8e3443 GS |
370 | if ($^O eq 'VMS') { |
371 | return $ENV{'PWD'} = $ENV{'DEFAULT'} | |
372 | } | |
4aecb5b5 JH |
373 | elsif ($^O eq 'MacOS') { |
374 | return $ENV{'PWD'} = cwd(); | |
375 | } | |
3b8e3443 | 376 | elsif ($^O eq 'MSWin32') { |
4ffa1610 | 377 | $ENV{'PWD'} = $newpwd; |
3b8e3443 GS |
378 | return 1; |
379 | } | |
748a9306 | 380 | |
e9475de8 SP |
381 | if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in |
382 | $ENV{'PWD'} = cwd(); | |
383 | } elsif ($newdir =~ m#^/#s) { | |
a0d0e21e | 384 | $ENV{'PWD'} = $newdir; |
4633a7c4 LW |
385 | } else { |
386 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
387 | @curdir = ('') unless @curdir; | |
388 | my $component; | |
a0d0e21e LW |
389 | foreach $component (split(m#/#, $newdir)) { |
390 | next if $component eq '.'; | |
391 | pop(@curdir),next if $component eq '..'; | |
392 | push(@curdir,$component); | |
393 | } | |
394 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
395 | } | |
4633a7c4 | 396 | 1; |
a0d0e21e LW |
397 | } |
398 | ||
a0c9c202 | 399 | |
99f36a73 | 400 | sub _perl_abs_path |
a0c9c202 JH |
401 | { |
402 | my $start = @_ ? shift : '.'; | |
403 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
404 | ||
405 | unless (@cst = stat( $start )) | |
406 | { | |
a9939470 | 407 | _carp("stat($start): $!"); |
a0c9c202 JH |
408 | return ''; |
409 | } | |
09122b95 RGS |
410 | |
411 | unless (-d _) { | |
412 | # Make sure we can be invoked on plain files, not just directories. | |
413 | # NOTE that this routine assumes that '/' is the only directory separator. | |
414 | ||
415 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} | |
416 | or return cwd() . '/' . $start; | |
417 | ||
275e8705 RGS |
418 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
419 | if (-l $start) { | |
09122b95 RGS |
420 | my $link_target = readlink($start); |
421 | die "Can't resolve link $start: $!" unless defined $link_target; | |
422 | ||
423 | require File::Spec; | |
424 | $link_target = $dir . '/' . $link_target | |
425 | unless File::Spec->file_name_is_absolute($link_target); | |
426 | ||
427 | return abs_path($link_target); | |
428 | } | |
429 | ||
99f36a73 | 430 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 RGS |
431 | } |
432 | ||
a0c9c202 JH |
433 | $cwd = ''; |
434 | $dotdots = $start; | |
435 | do | |
436 | { | |
437 | $dotdots .= '/..'; | |
438 | @pst = @cst; | |
a25ef67d | 439 | local *PARENT; |
a0c9c202 JH |
440 | unless (opendir(PARENT, $dotdots)) |
441 | { | |
bf7c0a3d | 442 | # probably a permissions issue. Try the native command. |
cdce0d84 | 443 | require File::Spec; |
bf7c0a3d | 444 | return File::Spec->rel2abs( $start, _backtick_pwd() ); |
a0c9c202 JH |
445 | } |
446 | unless (@cst = stat($dotdots)) | |
447 | { | |
a9939470 | 448 | _carp("stat($dotdots): $!"); |
a0c9c202 JH |
449 | closedir(PARENT); |
450 | return ''; | |
451 | } | |
452 | if ($pst[0] == $cst[0] && $pst[1] == $cst[1]) | |
453 | { | |
454 | $dir = undef; | |
455 | } | |
456 | else | |
457 | { | |
458 | do | |
459 | { | |
460 | unless (defined ($dir = readdir(PARENT))) | |
461 | { | |
a9939470 | 462 | _carp("readdir($dotdots): $!"); |
a0c9c202 JH |
463 | closedir(PARENT); |
464 | return ''; | |
465 | } | |
466 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) | |
467 | } | |
468 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || | |
469 | $tst[1] != $pst[1]); | |
470 | } | |
471 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; | |
472 | closedir(PARENT); | |
473 | } while (defined $dir); | |
474 | chop($cwd) unless $cwd eq '/'; # drop the trailing / | |
475 | $cwd; | |
476 | } | |
477 | ||
478 | ||
3ee63918 | 479 | my $Curdir; |
96e4d5b1 | 480 | sub fast_abs_path { |
99f36a73 | 481 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 | 482 | my $cwd = getcwd(); |
4d6b4052 | 483 | require File::Spec; |
3ee63918 MS |
484 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
485 | ||
486 | # Detaint else we'll explode in taint mode. This is safe because | |
487 | # we're not doing anything dangerous with it. | |
9f28c638 JB |
488 | ($path) = $path =~ /(.*)/s; |
489 | ($cwd) = $cwd =~ /(.*)/s; | |
3ee63918 | 490 | |
09122b95 RGS |
491 | unless (-e $path) { |
492 | _croak("$path: No such file or directory"); | |
493 | } | |
494 | ||
495 | unless (-d _) { | |
496 | # Make sure we can be invoked on plain files, not just directories. | |
497 | ||
498 | my ($vol, $dir, $file) = File::Spec->splitpath($path); | |
499 | return File::Spec->catfile($cwd, $path) unless length $dir; | |
500 | ||
501 | if (-l $path) { | |
502 | my $link_target = readlink($path); | |
503 | die "Can't resolve link $path: $!" unless defined $link_target; | |
504 | ||
505 | $link_target = File::Spec->catpath($vol, $dir, $link_target) | |
506 | unless File::Spec->file_name_is_absolute($link_target); | |
507 | ||
508 | return fast_abs_path($link_target); | |
509 | } | |
510 | ||
d6802e43 | 511 | return $dir eq File::Spec->rootdir |
99f36a73 RGS |
512 | ? File::Spec->catpath($vol, $dir, $file) |
513 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; | |
09122b95 RGS |
514 | } |
515 | ||
e2ba406b | 516 | if (!CORE::chdir($path)) { |
a9939470 | 517 | _croak("Cannot chdir to $path: $!"); |
e2ba406b | 518 | } |
96e4d5b1 | 519 | my $realpath = getcwd(); |
e2ba406b | 520 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 | 521 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b | 522 | } |
96e4d5b1 | 523 | $realpath; |
8b88ae92 NIS |
524 | } |
525 | ||
e4c51978 GS |
526 | # added function alias to follow principle of least surprise |
527 | # based on previous aliasing. --tchrist 27-Jan-00 | |
528 | *fast_realpath = \&fast_abs_path; | |
529 | ||
4633a7c4 LW |
530 | |
531 | # --- PORTING SECTION --- | |
532 | ||
533 | # VMS: $ENV{'DEFAULT'} points to default directory at all times | |
bd3fa61c | 534 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 | 535 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 NIS |
536 | # in the process logical name table as the default device and directory |
537 | # seen by Perl. This may not be the same as the default device | |
4633a7c4 LW |
538 | # and directory seen by DCL after Perl exits, since the effects |
539 | # the CRTL chdir() function persist only until Perl exits. | |
4633a7c4 LW |
540 | |
541 | sub _vms_cwd { | |
96e4d5b1 | 542 | return $ENV{'DEFAULT'}; |
543 | } | |
544 | ||
545 | sub _vms_abs_path { | |
546 | return $ENV{'DEFAULT'} unless @_; | |
61729915 | 547 | my $path = shift; |
9d7d9729 | 548 | |
53e80d0b JM |
549 | my $efs = _vms_efs; |
550 | my $unix_rpt = _vms_unix_rpt; | |
551 | ||
552 | if (defined &VMS::Filespec::vmsrealpath) { | |
553 | my $path_unix = 0; | |
554 | my $path_vms = 0; | |
555 | ||
556 | $path_unix = 1 if ($path =~ m#(?<=\^)/#); | |
557 | $path_unix = 1 if ($path =~ /^\.\.?$/); | |
558 | $path_vms = 1 if ($path =~ m#[\[<\]]#); | |
559 | $path_vms = 1 if ($path =~ /^--?$/); | |
560 | ||
561 | my $unix_mode = $path_unix; | |
562 | if ($efs) { | |
563 | # In case of a tie, the Unix report mode decides. | |
564 | if ($path_vms == $path_unix) { | |
565 | $unix_mode = $unix_rpt; | |
566 | } else { | |
567 | $unix_mode = 0 if $path_vms; | |
568 | } | |
569 | } | |
9d7d9729 | 570 | |
53e80d0b | 571 | if ($unix_mode) { |
bf7c0a3d | 572 | # Unix format |
53e80d0b | 573 | return VMS::Filespec::unixrealpath($path); |
bf7c0a3d SP |
574 | } |
575 | ||
576 | # VMS format | |
577 | ||
53e80d0b | 578 | my $new_path = VMS::Filespec::vmsrealpath($path); |
bf7c0a3d SP |
579 | |
580 | # Perl expects directories to be in directory format | |
581 | $new_path = VMS::Filespec::pathify($new_path) if -d $path; | |
582 | return $new_path; | |
583 | } | |
584 | ||
585 | # Fallback to older algorithm if correct ones are not | |
586 | # available. | |
587 | ||
53e80d0b JM |
588 | if (-l $path) { |
589 | my $link_target = readlink($path); | |
590 | die "Can't resolve link $path: $!" unless defined $link_target; | |
591 | ||
592 | return _vms_abs_path($link_target); | |
593 | } | |
594 | ||
61729915 CB |
595 | # may need to turn foo.dir into [.foo] |
596 | my $pathified = VMS::Filespec::pathify($path); | |
597 | $path = $pathified if defined $pathified; | |
598 | ||
96e4d5b1 | 599 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 | 600 | } |
68dc0745 | 601 | |
4633a7c4 LW |
602 | sub _os2_cwd { |
603 | $ENV{'PWD'} = `cmd /c cd`; | |
39741d73 | 604 | chomp $ENV{'PWD'}; |
aa6b7957 | 605 | $ENV{'PWD'} =~ s:\\:/:g ; |
4633a7c4 LW |
606 | return $ENV{'PWD'}; |
607 | } | |
608 | ||
8440aeb0 | 609 | sub _win32_cwd_simple { |
610 | $ENV{'PWD'} = `cd`; | |
611 | chomp $ENV{'PWD'}; | |
612 | $ENV{'PWD'} =~ s:\\:/:g ; | |
613 | return $ENV{'PWD'}; | |
614 | } | |
615 | ||
96e4d5b1 | 616 | sub _win32_cwd { |
5ec06e76 NC |
617 | # Need to avoid taking any sort of reference to the typeglob or the code in |
618 | # the optree, so that this tests the runtime state of things, as the | |
619 | # ExtUtils::MakeMaker tests for "miniperl" need to be able to fake things at | |
620 | # runtime by deleting the subroutine. *foo{THING} syntax on a symbol table | |
621 | # lookup avoids needing a string eval, which has been reported to cause | |
622 | # problems (for reasons that we haven't been able to get to the bottom of - | |
623 | # rt.cpan.org #56225) | |
624 | if (*{$DynaLoader::{boot_DynaLoader}}{CODE}) { | |
cf2f24a4 JD |
625 | $ENV{'PWD'} = Win32::GetCwd(); |
626 | } | |
627 | else { # miniperl | |
628 | chomp($ENV{'PWD'} = `cd`); | |
629 | } | |
aa6b7957 | 630 | $ENV{'PWD'} =~ s:\\:/:g ; |
96e4d5b1 | 631 | return $ENV{'PWD'}; |
632 | } | |
633 | ||
8440aeb0 | 634 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_win32_cwd_simple; |
68dc0745 | 635 | |
39e571d4 LM |
636 | sub _dos_cwd { |
637 | if (!defined &Dos::GetCwd) { | |
638 | $ENV{'PWD'} = `command /c cd`; | |
39741d73 | 639 | chomp $ENV{'PWD'}; |
aa6b7957 | 640 | $ENV{'PWD'} =~ s:\\:/:g ; |
39e571d4 LM |
641 | } else { |
642 | $ENV{'PWD'} = Dos::GetCwd(); | |
643 | } | |
55497cff | 644 | return $ENV{'PWD'}; |
645 | } | |
646 | ||
7fbf1995 | 647 | sub _qnx_cwd { |
35b807ef NA |
648 | local $ENV{PATH} = ''; |
649 | local $ENV{CDPATH} = ''; | |
650 | local $ENV{ENV} = ''; | |
7fbf1995 | 651 | $ENV{'PWD'} = `/usr/bin/fullpath -t`; |
39741d73 | 652 | chomp $ENV{'PWD'}; |
7fbf1995 NA |
653 | return $ENV{'PWD'}; |
654 | } | |
655 | ||
656 | sub _qnx_abs_path { | |
35b807ef NA |
657 | local $ENV{PATH} = ''; |
658 | local $ENV{CDPATH} = ''; | |
659 | local $ENV{ENV} = ''; | |
fa921dc6 | 660 | my $path = @_ ? shift : '.'; |
39741d73 MS |
661 | local *REALPATH; |
662 | ||
99f36a73 | 663 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 MS |
664 | die "Can't open /usr/bin/fullpath: $!"; |
665 | my $realpath = <REALPATH>; | |
666 | close REALPATH; | |
667 | chomp $realpath; | |
7fbf1995 NA |
668 | return $realpath; |
669 | } | |
670 | ||
ed79a026 OF |
671 | sub _epoc_cwd { |
672 | $ENV{'PWD'} = EPOC::getcwd(); | |
673 | return $ENV{'PWD'}; | |
674 | } | |
675 | ||
4633a7c4 | 676 | |
09122b95 RGS |
677 | # Now that all the base-level functions are set up, alias the |
678 | # user-level functions to the right places | |
679 | ||
680 | if (exists $METHOD_MAP{$^O}) { | |
681 | my $map = $METHOD_MAP{$^O}; | |
682 | foreach my $name (keys %$map) { | |
99f36a73 | 683 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 RGS |
684 | no strict 'refs'; |
685 | *{$name} = \&{$map->{$name}}; | |
686 | } | |
55497cff | 687 | } |
4633a7c4 | 688 | |
99f36a73 RGS |
689 | # In case the XS version doesn't load. |
690 | *abs_path = \&_perl_abs_path unless defined &abs_path; | |
a7a23d71 | 691 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 RGS |
692 | |
693 | # added function alias for those of us more | |
694 | # used to the libc function. --tchrist 27-Jan-00 | |
695 | *realpath = \&abs_path; | |
4633a7c4 | 696 | |
a0d0e21e | 697 | 1; |
f4eedc6b DD |
698 | __END__ |
699 | ||
700 | =head1 NAME | |
701 | ||
702 | Cwd - get pathname of current working directory | |
703 | ||
704 | =head1 SYNOPSIS | |
705 | ||
706 | use Cwd; | |
707 | my $dir = getcwd; | |
708 | ||
709 | use Cwd 'abs_path'; | |
710 | my $abs_path = abs_path($file); | |
711 | ||
712 | =head1 DESCRIPTION | |
713 | ||
714 | This module provides functions for determining the pathname of the | |
715 | current working directory. It is recommended that getcwd (or another | |
716 | *cwd() function) be used in I<all> code to ensure portability. | |
717 | ||
718 | By default, it exports the functions cwd(), getcwd(), fastcwd(), and | |
719 | fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace. | |
720 | ||
721 | ||
722 | =head2 getcwd and friends | |
723 | ||
724 | Each of these functions are called without arguments and return the | |
725 | absolute path of the current working directory. | |
726 | ||
727 | =over 4 | |
728 | ||
729 | =item getcwd | |
730 | ||
731 | my $cwd = getcwd(); | |
732 | ||
733 | Returns the current working directory. | |
734 | ||
735 | Exposes the POSIX function getcwd(3) or re-implements it if it's not | |
736 | available. | |
737 | ||
738 | =item cwd | |
739 | ||
740 | my $cwd = cwd(); | |
741 | ||
742 | The cwd() is the most natural form for the current architecture. For | |
743 | most systems it is identical to `pwd` (but without the trailing line | |
744 | terminator). | |
745 | ||
746 | =item fastcwd | |
747 | ||
748 | my $cwd = fastcwd(); | |
749 | ||
750 | A more dangerous version of getcwd(), but potentially faster. | |
751 | ||
752 | It might conceivably chdir() you out of a directory that it can't | |
753 | chdir() you back into. If fastcwd encounters a problem it will return | |
754 | undef but will probably leave you in a different directory. For a | |
755 | measure of extra security, if everything appears to have worked, the | |
756 | fastcwd() function will check that it leaves you in the same directory | |
757 | that it started in. If it has changed it will C<die> with the message | |
758 | "Unstable directory path, current directory changed | |
759 | unexpectedly". That should never happen. | |
760 | ||
761 | =item fastgetcwd | |
762 | ||
763 | my $cwd = fastgetcwd(); | |
764 | ||
765 | The fastgetcwd() function is provided as a synonym for cwd(). | |
766 | ||
767 | =item getdcwd | |
768 | ||
769 | my $cwd = getdcwd(); | |
770 | my $cwd = getdcwd('C:'); | |
771 | ||
772 | The getdcwd() function is also provided on Win32 to get the current working | |
773 | directory on the specified drive, since Windows maintains a separate current | |
774 | working directory for each drive. If no drive is specified then the current | |
775 | drive is assumed. | |
776 | ||
777 | This function simply calls the Microsoft C library _getdcwd() function. | |
778 | ||
779 | =back | |
780 | ||
781 | ||
782 | =head2 abs_path and friends | |
783 | ||
784 | These functions are exported only on request. They each take a single | |
785 | argument and return the absolute pathname for it. If no argument is | |
786 | given they'll use the current working directory. | |
787 | ||
788 | =over 4 | |
789 | ||
790 | =item abs_path | |
791 | ||
792 | my $abs_path = abs_path($file); | |
793 | ||
794 | Uses the same algorithm as getcwd(). Symbolic links and relative-path | |
795 | components ("." and "..") are resolved to return the canonical | |
796 | pathname, just like realpath(3). | |
797 | ||
798 | =item realpath | |
799 | ||
800 | my $abs_path = realpath($file); | |
801 | ||
802 | A synonym for abs_path(). | |
803 | ||
804 | =item fast_abs_path | |
805 | ||
806 | my $abs_path = fast_abs_path($file); | |
807 | ||
808 | A more dangerous, but potentially faster version of abs_path. | |
809 | ||
810 | =back | |
811 | ||
812 | =head2 $ENV{PWD} | |
813 | ||
814 | If you ask to override your chdir() built-in function, | |
815 | ||
816 | use Cwd qw(chdir); | |
817 | ||
818 | then your PWD environment variable will be kept up to date. Note that | |
819 | it will only be kept up to date if all packages which use chdir import | |
820 | it from Cwd. | |
821 | ||
822 | ||
823 | =head1 NOTES | |
824 | ||
825 | =over 4 | |
826 | ||
827 | =item * | |
828 | ||
829 | Since the path separators are different on some operating systems ('/' | |
830 | on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec | |
831 | modules wherever portability is a concern. | |
832 | ||
833 | =item * | |
834 | ||
835 | Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()> | |
836 | functions are all aliases for the C<cwd()> function, which, on Mac OS, | |
837 | calls `pwd`. Likewise, the C<abs_path()> function is an alias for | |
838 | C<fast_abs_path()>. | |
839 | ||
840 | =back | |
841 | ||
842 | =head1 AUTHOR | |
843 | ||
844 | Originally by the perl5-porters. | |
845 | ||
846 | Maintained by Ken Williams <KWILLIAMS@cpan.org> | |
847 | ||
848 | =head1 COPYRIGHT | |
849 | ||
850 | Copyright (c) 2004 by the Perl 5 Porters. All rights reserved. | |
851 | ||
852 | This program is free software; you can redistribute it and/or modify | |
853 | it under the same terms as Perl itself. | |
854 | ||
855 | Portions of the C code in this library are copyright (c) 1994 by the | |
856 | Regents of the University of California. All rights reserved. The | |
857 | license on this code is compatible with the licensing of the rest of | |
858 | the distribution - please see the source code in F<Cwd.xs> for the | |
859 | details. | |
860 | ||
861 | =head1 SEE ALSO | |
862 | ||
863 | L<File::chdir> | |
864 | ||
865 | =cut |