Commit | Line | Data |
---|---|---|
a0d0e21e | 1 | package Cwd; |
b060a406 | 2 | use strict; |
a9939470 | 3 | use Exporter; |
99f36a73 | 4 | |
b9a5a78f | 5 | |
87c4c246 | 6 | our $VERSION = '3.81'; |
4a4ab19c | 7 | my $xs_version = $VERSION; |
4f642d62 | 8 | $VERSION =~ tr/_//d; |
96e4d5b1 | 9 | |
1a58b39a N |
10 | our @ISA = qw/ Exporter /; |
11 | our @EXPORT = qw(cwd getcwd fastcwd fastgetcwd); | |
09122b95 | 12 | push @EXPORT, qw(getdcwd) if $^O eq 'MSWin32'; |
1a58b39a | 13 | our @EXPORT_OK = qw(chdir abs_path fast_abs_path realpath fast_realpath); |
a0d0e21e | 14 | |
f5f423e4 IZ |
15 | # sys_cwd may keep the builtin command |
16 | ||
17 | # All the functionality of this module may provided by builtins, | |
18 | # there is no sense to process the rest of the file. | |
19 | # The best choice may be to have this in BEGIN, but how to return from BEGIN? | |
20 | ||
a9939470 | 21 | if ($^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') { | |
8901ddee TC |
43 | if (eval { local $SIG{__DIE__}; |
44 | local @INC = @INC; | |
45 | pop @INC if $INC[-1] eq '.'; | |
46 | require VMS::Feature; }) { | |
53e80d0b JM |
47 | $use_vms_feature = 1; |
48 | } | |
49 | } | |
50 | } | |
51 | ||
52 | # Need to look up the UNIX report mode. This may become a dynamic mode | |
53 | # in the future. | |
54 | sub _vms_unix_rpt { | |
55 | my $unix_rpt; | |
56 | if ($use_vms_feature) { | |
57 | $unix_rpt = VMS::Feature::current("filename_unix_report"); | |
58 | } else { | |
59 | my $env_unix_rpt = $ENV{'DECC$FILENAME_UNIX_REPORT'} || ''; | |
a7884731 | 60 | $unix_rpt = $env_unix_rpt =~ /^[ET1]/i; |
53e80d0b JM |
61 | } |
62 | return $unix_rpt; | |
63 | } | |
64 | ||
65 | # Need to look up the EFS character set mode. This may become a dynamic | |
66 | # mode in the future. | |
67 | sub _vms_efs { | |
68 | my $efs; | |
69 | if ($use_vms_feature) { | |
70 | $efs = VMS::Feature::current("efs_charset"); | |
71 | } else { | |
72 | my $env_efs = $ENV{'DECC$EFS_CHARSET'} || ''; | |
a7884731 | 73 | $efs = $env_efs =~ /^[ET1]/i; |
53e80d0b JM |
74 | } |
75 | return $efs; | |
76 | } | |
77 | ||
78 | ||
b04f6d36 | 79 | # If loading the XS stuff doesn't work, we can fall back to pure perl |
b9a5a78f N |
80 | if(! defined &getcwd && defined &DynaLoader::boot_DynaLoader) { # skipped on miniperl |
81 | require XSLoader; | |
82 | XSLoader::load( __PACKAGE__, $xs_version); | |
07f43755 | 83 | } |
4633a7c4 | 84 | |
09122b95 RGS |
85 | # Big nasty table of function aliases |
86 | my %METHOD_MAP = | |
87 | ( | |
88 | VMS => | |
89 | { | |
90 | cwd => '_vms_cwd', | |
91 | getcwd => '_vms_cwd', | |
92 | fastcwd => '_vms_cwd', | |
93 | fastgetcwd => '_vms_cwd', | |
94 | abs_path => '_vms_abs_path', | |
95 | fast_abs_path => '_vms_abs_path', | |
96 | }, | |
97 | ||
98 | MSWin32 => | |
99 | { | |
100 | # We assume that &_NT_cwd is defined as an XSUB or in the core. | |
101 | cwd => '_NT_cwd', | |
102 | getcwd => '_NT_cwd', | |
103 | fastcwd => '_NT_cwd', | |
104 | fastgetcwd => '_NT_cwd', | |
105 | abs_path => 'fast_abs_path', | |
106 | realpath => 'fast_abs_path', | |
107 | }, | |
108 | ||
109 | dos => | |
110 | { | |
111 | cwd => '_dos_cwd', | |
112 | getcwd => '_dos_cwd', | |
113 | fastgetcwd => '_dos_cwd', | |
114 | fastcwd => '_dos_cwd', | |
115 | abs_path => 'fast_abs_path', | |
116 | }, | |
117 | ||
58ccccf6 | 118 | # QNX4. QNX6 has a $os of 'nto'. |
09122b95 RGS |
119 | qnx => |
120 | { | |
121 | cwd => '_qnx_cwd', | |
122 | getcwd => '_qnx_cwd', | |
123 | fastgetcwd => '_qnx_cwd', | |
124 | fastcwd => '_qnx_cwd', | |
125 | abs_path => '_qnx_abs_path', | |
126 | fast_abs_path => '_qnx_abs_path', | |
127 | }, | |
128 | ||
129 | cygwin => | |
130 | { | |
131 | getcwd => 'cwd', | |
132 | fastgetcwd => 'cwd', | |
133 | fastcwd => 'cwd', | |
134 | abs_path => 'fast_abs_path', | |
135 | realpath => 'fast_abs_path', | |
136 | }, | |
137 | ||
027b7a30 AB |
138 | amigaos => |
139 | { | |
140 | getcwd => '_backtick_pwd', | |
141 | fastgetcwd => '_backtick_pwd', | |
142 | fastcwd => '_backtick_pwd', | |
143 | abs_path => 'fast_abs_path', | |
144 | } | |
09122b95 RGS |
145 | ); |
146 | ||
147 | $METHOD_MAP{NT} = $METHOD_MAP{MSWin32}; | |
09122b95 | 148 | |
96e4d5b1 | 149 | |
3547aa9a MS |
150 | # Find the pwd command in the expected locations. We assume these |
151 | # are safe. This prevents _backtick_pwd() consulting $ENV{PATH} | |
152 | # so everything works under taint mode. | |
153 | my $pwd_cmd; | |
f4eedc6b DD |
154 | if($^O ne 'MSWin32') { |
155 | foreach my $try ('/bin/pwd', | |
156 | '/usr/bin/pwd', | |
157 | '/QOpenSys/bin/pwd', # OS/400 PASE. | |
158 | ) { | |
159 | if( -x $try ) { | |
160 | $pwd_cmd = $try; | |
161 | last; | |
162 | } | |
3547aa9a MS |
163 | } |
164 | } | |
b2fc9074 BF |
165 | |
166 | # Android has a built-in pwd. Using $pwd_cmd will DTRT if | |
167 | # this perl was compiled with -Dd_useshellcmds, which is the | |
168 | # default for Android, but the block below is needed for the | |
169 | # miniperl running on the host when cross-compiling, and | |
170 | # potentially for native builds with -Ud_useshellcmds. | |
171 | if ($^O =~ /android/) { | |
172 | # If targetsh is executable, then we're either a full | |
173 | # perl, or a miniperl for a native build. | |
ac9c4ce8 | 174 | if ( exists($Config::Config{targetsh}) && -x $Config::Config{targetsh}) { |
b2fc9074 BF |
175 | $pwd_cmd = "$Config::Config{targetsh} -c pwd" |
176 | } | |
177 | else { | |
e7d73da9 BF |
178 | my $sh = $Config::Config{sh} || (-x '/system/bin/sh' ? '/system/bin/sh' : 'sh'); |
179 | $pwd_cmd = "$sh -c pwd" | |
b2fc9074 BF |
180 | } |
181 | } | |
182 | ||
fa52125f | 183 | my $found_pwd_cmd = defined($pwd_cmd); |
3547aa9a | 184 | |
a9939470 NC |
185 | # Lazy-load Carp |
186 | sub _carp { require Carp; Carp::carp(@_) } | |
187 | sub _croak { require Carp; Carp::croak(@_) } | |
188 | ||
3547aa9a | 189 | # The 'natural and safe form' for UNIX (pwd may be setuid root) |
8b88ae92 | 190 | sub _backtick_pwd { |
027b7a30 AB |
191 | |
192 | # Localize %ENV entries in a way that won't create new hash keys. | |
193 | # Under AmigaOS we don't want to localize as it stops perl from | |
194 | # finding 'sh' in the PATH. | |
195 | my @localize = grep exists $ENV{$_}, qw(PATH IFS CDPATH ENV BASH_ENV) if $^O ne "amigaos"; | |
196 | local @ENV{@localize} if @localize; | |
f6342b4b | 197 | |
3547aa9a | 198 | my $cwd = `$pwd_cmd`; |
ac3b20cb | 199 | # Belt-and-suspenders in case someone said "undef $/". |
5cf6da5f | 200 | local $/ = "\n"; |
ac3b20cb | 201 | # `pwd` may fail e.g. if the disk is full |
7e03f963 | 202 | chomp($cwd) if defined $cwd; |
4633a7c4 | 203 | $cwd; |
8b88ae92 | 204 | } |
4633a7c4 LW |
205 | |
206 | # Since some ports may predefine cwd internally (e.g., NT) | |
207 | # we take care not to override an existing definition for cwd(). | |
208 | ||
09122b95 | 209 | unless ($METHOD_MAP{$^O}{cwd} or defined &cwd) { |
e229c0fe | 210 | if( $found_pwd_cmd ) |
73b801a6 | 211 | { |
ea54c8bd EC |
212 | *cwd = \&_backtick_pwd; |
213 | } | |
214 | else { | |
44e4059b TC |
215 | # getcwd() might have an empty prototype |
216 | *cwd = sub { getcwd(); }; | |
ea54c8bd EC |
217 | } |
218 | } | |
a0d0e21e | 219 | |
23bb49fa SP |
220 | if ($^O eq 'cygwin') { |
221 | # We need to make sure cwd() is called with no args, because it's | |
222 | # got an arg-less prototype and will die if args are present. | |
223 | local $^W = 0; | |
224 | my $orig_cwd = \&cwd; | |
225 | *cwd = sub { &$orig_cwd() } | |
226 | } | |
227 | ||
228 | ||
1f4f94f5 RS |
229 | # set a reasonable (and very safe) default for fastgetcwd, in case it |
230 | # isn't redefined later (20001212 rspier) | |
231 | *fastgetcwd = \&cwd; | |
748a9306 | 232 | |
c47834cd RGS |
233 | # A non-XS version of getcwd() - also used to bootstrap the perl build |
234 | # process, when miniperl is running and no XS loading happens. | |
a7a23d71 NC |
235 | sub _perl_getcwd |
236 | { | |
237 | abs_path('.'); | |
238 | } | |
239 | ||
a0c9c202 JH |
240 | # By John Bazik |
241 | # | |
242 | # Usage: $cwd = &fastcwd; | |
243 | # | |
244 | # This is a faster version of getcwd. It's also more dangerous because | |
245 | # you might chdir out of a directory that you can't chdir back into. | |
246 | ||
99f36a73 | 247 | sub fastcwd_ { |
a0c9c202 JH |
248 | my($odev, $oino, $cdev, $cino, $tdev, $tino); |
249 | my(@path, $path); | |
250 | local(*DIR); | |
251 | ||
252 | my($orig_cdev, $orig_cino) = stat('.'); | |
253 | ($cdev, $cino) = ($orig_cdev, $orig_cino); | |
254 | for (;;) { | |
255 | my $direntry; | |
256 | ($odev, $oino) = ($cdev, $cino); | |
257 | CORE::chdir('..') || return undef; | |
258 | ($cdev, $cino) = stat('.'); | |
73a0855d | 259 | last if $odev == $cdev && $oino eq $cino; |
a0c9c202 JH |
260 | opendir(DIR, '.') || return undef; |
261 | for (;;) { | |
262 | $direntry = readdir(DIR); | |
263 | last unless defined $direntry; | |
264 | next if $direntry eq '.'; | |
265 | next if $direntry eq '..'; | |
266 | ||
267 | ($tdev, $tino) = lstat($direntry); | |
73a0855d | 268 | last unless $tdev != $odev || $tino ne $oino; |
a0c9c202 JH |
269 | } |
270 | closedir(DIR); | |
271 | return undef unless defined $direntry; # should never happen | |
272 | unshift(@path, $direntry); | |
273 | } | |
274 | $path = '/' . join('/', @path); | |
275 | if ($^O eq 'apollo') { $path = "/".$path; } | |
276 | # At this point $path may be tainted (if tainting) and chdir would fail. | |
248785eb RGS |
277 | # Untaint it then check that we landed where we started. |
278 | $path =~ /^(.*)\z/s # untaint | |
279 | && CORE::chdir($1) or return undef; | |
a0c9c202 JH |
280 | ($cdev, $cino) = stat('.'); |
281 | die "Unstable directory path, current directory changed unexpectedly" | |
73a0855d | 282 | if $cdev != $orig_cdev || $cino ne $orig_cino; |
a0c9c202 JH |
283 | $path; |
284 | } | |
99f36a73 | 285 | if (not defined &fastcwd) { *fastcwd = \&fastcwd_ } |
a0c9c202 JH |
286 | |
287 | ||
4633a7c4 | 288 | # Keeps track of current working directory in PWD environment var |
a0d0e21e LW |
289 | # Usage: |
290 | # use Cwd 'chdir'; | |
291 | # chdir $newdir; | |
292 | ||
4633a7c4 | 293 | my $chdir_init = 0; |
a0d0e21e | 294 | |
4633a7c4 | 295 | sub chdir_init { |
3b8e3443 | 296 | if ($ENV{'PWD'} and $^O ne 'os2' and $^O ne 'dos' and $^O ne 'MSWin32') { |
a0d0e21e LW |
297 | my($dd,$di) = stat('.'); |
298 | my($pd,$pi) = stat($ENV{'PWD'}); | |
73a0855d | 299 | if (!defined $dd or !defined $pd or $di ne $pi or $dd != $pd) { |
4633a7c4 | 300 | $ENV{'PWD'} = cwd(); |
a0d0e21e LW |
301 | } |
302 | } | |
303 | else { | |
3b8e3443 GS |
304 | my $wd = cwd(); |
305 | $wd = Win32::GetFullPathName($wd) if $^O eq 'MSWin32'; | |
306 | $ENV{'PWD'} = $wd; | |
a0d0e21e | 307 | } |
4633a7c4 | 308 | # Strip an automounter prefix (where /tmp_mnt/foo/bar == /foo/bar) |
3b8e3443 | 309 | if ($^O ne 'MSWin32' and $ENV{'PWD'} =~ m|(/[^/]+(/[^/]+/[^/]+))(.*)|s) { |
a0d0e21e LW |
310 | my($pd,$pi) = stat($2); |
311 | my($dd,$di) = stat($1); | |
73a0855d | 312 | if (defined $pd and defined $dd and $di ne $pi and $dd == $pd) { |
a0d0e21e LW |
313 | $ENV{'PWD'}="$2$3"; |
314 | } | |
315 | } | |
316 | $chdir_init = 1; | |
317 | } | |
318 | ||
319 | sub chdir { | |
22978713 | 320 | my $newdir = @_ ? shift : ''; # allow for no arg (chdir to HOME dir) |
faa5d6ec TC |
321 | if ($^O eq "cygwin") { |
322 | $newdir =~ s|\A///+|//|; | |
323 | $newdir =~ s|(?<=[^/])//+|/|g; | |
324 | } | |
325 | elsif ($^O ne 'MSWin32') { | |
326 | $newdir =~ s|///*|/|g; | |
327 | } | |
a0d0e21e | 328 | chdir_init() unless $chdir_init; |
4ffa1610 JH |
329 | my $newpwd; |
330 | if ($^O eq 'MSWin32') { | |
331 | # get the full path name *before* the chdir() | |
332 | $newpwd = Win32::GetFullPathName($newdir); | |
333 | } | |
334 | ||
4633a7c4 | 335 | return 0 unless CORE::chdir $newdir; |
4ffa1610 | 336 | |
3b8e3443 GS |
337 | if ($^O eq 'VMS') { |
338 | return $ENV{'PWD'} = $ENV{'DEFAULT'} | |
339 | } | |
340 | elsif ($^O eq 'MSWin32') { | |
4ffa1610 | 341 | $ENV{'PWD'} = $newpwd; |
3b8e3443 GS |
342 | return 1; |
343 | } | |
748a9306 | 344 | |
e9475de8 SP |
345 | if (ref $newdir eq 'GLOB') { # in case a file/dir handle is passed in |
346 | $ENV{'PWD'} = cwd(); | |
347 | } elsif ($newdir =~ m#^/#s) { | |
a0d0e21e | 348 | $ENV{'PWD'} = $newdir; |
4633a7c4 LW |
349 | } else { |
350 | my @curdir = split(m#/#,$ENV{'PWD'}); | |
351 | @curdir = ('') unless @curdir; | |
352 | my $component; | |
a0d0e21e LW |
353 | foreach $component (split(m#/#, $newdir)) { |
354 | next if $component eq '.'; | |
355 | pop(@curdir),next if $component eq '..'; | |
356 | push(@curdir,$component); | |
357 | } | |
358 | $ENV{'PWD'} = join('/',@curdir) || '/'; | |
359 | } | |
4633a7c4 | 360 | 1; |
a0d0e21e LW |
361 | } |
362 | ||
a0c9c202 | 363 | |
99f36a73 | 364 | sub _perl_abs_path |
a0c9c202 JH |
365 | { |
366 | my $start = @_ ? shift : '.'; | |
367 | my($dotdots, $cwd, @pst, @cst, $dir, @tst); | |
368 | ||
369 | unless (@cst = stat( $start )) | |
370 | { | |
d2e38af7 | 371 | return undef; |
a0c9c202 | 372 | } |
09122b95 RGS |
373 | |
374 | unless (-d _) { | |
375 | # Make sure we can be invoked on plain files, not just directories. | |
376 | # NOTE that this routine assumes that '/' is the only directory separator. | |
377 | ||
378 | my ($dir, $file) = $start =~ m{^(.*)/(.+)$} | |
379 | or return cwd() . '/' . $start; | |
380 | ||
275e8705 RGS |
381 | # Can't use "-l _" here, because the previous stat was a stat(), not an lstat(). |
382 | if (-l $start) { | |
09122b95 RGS |
383 | my $link_target = readlink($start); |
384 | die "Can't resolve link $start: $!" unless defined $link_target; | |
385 | ||
386 | require File::Spec; | |
387 | $link_target = $dir . '/' . $link_target | |
388 | unless File::Spec->file_name_is_absolute($link_target); | |
389 | ||
390 | return abs_path($link_target); | |
391 | } | |
392 | ||
99f36a73 | 393 | return $dir ? abs_path($dir) . "/$file" : "/$file"; |
09122b95 RGS |
394 | } |
395 | ||
a0c9c202 JH |
396 | $cwd = ''; |
397 | $dotdots = $start; | |
398 | do | |
399 | { | |
400 | $dotdots .= '/..'; | |
401 | @pst = @cst; | |
a25ef67d | 402 | local *PARENT; |
a0c9c202 JH |
403 | unless (opendir(PARENT, $dotdots)) |
404 | { | |
815d526f | 405 | return undef; |
a0c9c202 JH |
406 | } |
407 | unless (@cst = stat($dotdots)) | |
408 | { | |
d2e38af7 | 409 | my $e = $!; |
a0c9c202 | 410 | closedir(PARENT); |
d2e38af7 Z |
411 | $! = $e; |
412 | return undef; | |
a0c9c202 | 413 | } |
73a0855d | 414 | if ($pst[0] == $cst[0] && $pst[1] eq $cst[1]) |
a0c9c202 JH |
415 | { |
416 | $dir = undef; | |
417 | } | |
418 | else | |
419 | { | |
420 | do | |
421 | { | |
422 | unless (defined ($dir = readdir(PARENT))) | |
423 | { | |
a0c9c202 | 424 | closedir(PARENT); |
d2e38af7 Z |
425 | require Errno; |
426 | $! = Errno::ENOENT(); | |
427 | return undef; | |
a0c9c202 JH |
428 | } |
429 | $tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir")) | |
430 | } | |
431 | while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] || | |
73a0855d | 432 | $tst[1] ne $pst[1]); |
a0c9c202 JH |
433 | } |
434 | $cwd = (defined $dir ? "$dir" : "" ) . "/$cwd" ; | |
435 | closedir(PARENT); | |
436 | } while (defined $dir); | |
437 | chop($cwd) unless $cwd eq '/'; # drop the trailing / | |
438 | $cwd; | |
439 | } | |
440 | ||
441 | ||
3ee63918 | 442 | my $Curdir; |
96e4d5b1 | 443 | sub fast_abs_path { |
99f36a73 | 444 | local $ENV{PWD} = $ENV{PWD} || ''; # Guard against clobberage |
96e4d5b1 | 445 | my $cwd = getcwd(); |
a97021b9 | 446 | defined $cwd or return undef; |
4d6b4052 | 447 | require File::Spec; |
3ee63918 MS |
448 | my $path = @_ ? shift : ($Curdir ||= File::Spec->curdir); |
449 | ||
450 | # Detaint else we'll explode in taint mode. This is safe because | |
451 | # we're not doing anything dangerous with it. | |
9f28c638 JB |
452 | ($path) = $path =~ /(.*)/s; |
453 | ($cwd) = $cwd =~ /(.*)/s; | |
3ee63918 | 454 | |
09122b95 | 455 | unless (-e $path) { |
a97021b9 Z |
456 | require Errno; |
457 | $! = Errno::ENOENT(); | |
458 | return undef; | |
09122b95 RGS |
459 | } |
460 | ||
461 | unless (-d _) { | |
462 | # Make sure we can be invoked on plain files, not just directories. | |
463 | ||
464 | my ($vol, $dir, $file) = File::Spec->splitpath($path); | |
465 | return File::Spec->catfile($cwd, $path) unless length $dir; | |
466 | ||
467 | if (-l $path) { | |
468 | my $link_target = readlink($path); | |
a97021b9 | 469 | defined $link_target or return undef; |
09122b95 RGS |
470 | |
471 | $link_target = File::Spec->catpath($vol, $dir, $link_target) | |
472 | unless File::Spec->file_name_is_absolute($link_target); | |
473 | ||
474 | return fast_abs_path($link_target); | |
475 | } | |
476 | ||
d6802e43 | 477 | return $dir eq File::Spec->rootdir |
99f36a73 RGS |
478 | ? File::Spec->catpath($vol, $dir, $file) |
479 | : fast_abs_path(File::Spec->catpath($vol, $dir, '')) . '/' . $file; | |
09122b95 RGS |
480 | } |
481 | ||
e2ba406b | 482 | if (!CORE::chdir($path)) { |
a97021b9 | 483 | return undef; |
e2ba406b | 484 | } |
96e4d5b1 | 485 | my $realpath = getcwd(); |
e2ba406b | 486 | if (! ((-d $cwd) && (CORE::chdir($cwd)))) { |
a9939470 | 487 | _croak("Cannot chdir back to $cwd: $!"); |
e2ba406b | 488 | } |
96e4d5b1 | 489 | $realpath; |
8b88ae92 NIS |
490 | } |
491 | ||
e4c51978 GS |
492 | # added function alias to follow principle of least surprise |
493 | # based on previous aliasing. --tchrist 27-Jan-00 | |
494 | *fast_realpath = \&fast_abs_path; | |
495 | ||
4633a7c4 LW |
496 | |
497 | # --- PORTING SECTION --- | |
498 | ||
499 | # VMS: $ENV{'DEFAULT'} points to default directory at all times | |
bd3fa61c | 500 | # 06-Mar-1996 Charles Bailey bailey@newman.upenn.edu |
c6538b72 | 501 | # Note: Use of Cwd::chdir() causes the logical name PWD to be defined |
8b88ae92 NIS |
502 | # in the process logical name table as the default device and directory |
503 | # seen by Perl. This may not be the same as the default device | |
4633a7c4 LW |
504 | # and directory seen by DCL after Perl exits, since the effects |
505 | # the CRTL chdir() function persist only until Perl exits. | |
4633a7c4 LW |
506 | |
507 | sub _vms_cwd { | |
96e4d5b1 | 508 | return $ENV{'DEFAULT'}; |
509 | } | |
510 | ||
511 | sub _vms_abs_path { | |
512 | return $ENV{'DEFAULT'} unless @_; | |
61729915 | 513 | my $path = shift; |
9d7d9729 | 514 | |
53e80d0b JM |
515 | my $efs = _vms_efs; |
516 | my $unix_rpt = _vms_unix_rpt; | |
517 | ||
518 | if (defined &VMS::Filespec::vmsrealpath) { | |
519 | my $path_unix = 0; | |
520 | my $path_vms = 0; | |
521 | ||
522 | $path_unix = 1 if ($path =~ m#(?<=\^)/#); | |
523 | $path_unix = 1 if ($path =~ /^\.\.?$/); | |
524 | $path_vms = 1 if ($path =~ m#[\[<\]]#); | |
525 | $path_vms = 1 if ($path =~ /^--?$/); | |
526 | ||
527 | my $unix_mode = $path_unix; | |
528 | if ($efs) { | |
529 | # In case of a tie, the Unix report mode decides. | |
530 | if ($path_vms == $path_unix) { | |
531 | $unix_mode = $unix_rpt; | |
532 | } else { | |
533 | $unix_mode = 0 if $path_vms; | |
534 | } | |
535 | } | |
9d7d9729 | 536 | |
53e80d0b | 537 | if ($unix_mode) { |
bf7c0a3d | 538 | # Unix format |
53e80d0b | 539 | return VMS::Filespec::unixrealpath($path); |
bf7c0a3d SP |
540 | } |
541 | ||
542 | # VMS format | |
543 | ||
53e80d0b | 544 | my $new_path = VMS::Filespec::vmsrealpath($path); |
bf7c0a3d SP |
545 | |
546 | # Perl expects directories to be in directory format | |
547 | $new_path = VMS::Filespec::pathify($new_path) if -d $path; | |
548 | return $new_path; | |
549 | } | |
550 | ||
551 | # Fallback to older algorithm if correct ones are not | |
552 | # available. | |
553 | ||
53e80d0b JM |
554 | if (-l $path) { |
555 | my $link_target = readlink($path); | |
556 | die "Can't resolve link $path: $!" unless defined $link_target; | |
557 | ||
558 | return _vms_abs_path($link_target); | |
559 | } | |
560 | ||
61729915 CB |
561 | # may need to turn foo.dir into [.foo] |
562 | my $pathified = VMS::Filespec::pathify($path); | |
563 | $path = $pathified if defined $pathified; | |
564 | ||
96e4d5b1 | 565 | return VMS::Filespec::rmsexpand($path); |
4633a7c4 | 566 | } |
68dc0745 | 567 | |
4633a7c4 | 568 | sub _os2_cwd { |
3480fbaa DD |
569 | my $pwd = `cmd /c cd`; |
570 | chomp $pwd; | |
571 | $pwd =~ s:\\:/:g ; | |
572 | $ENV{'PWD'} = $pwd; | |
573 | return $pwd; | |
4633a7c4 LW |
574 | } |
575 | ||
8440aeb0 | 576 | sub _win32_cwd_simple { |
3480fbaa DD |
577 | my $pwd = `cd`; |
578 | chomp $pwd; | |
579 | $pwd =~ s:\\:/:g ; | |
580 | $ENV{'PWD'} = $pwd; | |
581 | return $pwd; | |
8440aeb0 | 582 | } |
583 | ||
96e4d5b1 | 584 | sub _win32_cwd { |
3480fbaa | 585 | my $pwd; |
8f1332ed | 586 | $pwd = Win32::GetCwd(); |
3480fbaa DD |
587 | $pwd =~ s:\\:/:g ; |
588 | $ENV{'PWD'} = $pwd; | |
589 | return $pwd; | |
96e4d5b1 | 590 | } |
591 | ||
8440aeb0 | 592 | *_NT_cwd = defined &Win32::GetCwd ? \&_win32_cwd : \&_win32_cwd_simple; |
68dc0745 | 593 | |
39e571d4 | 594 | sub _dos_cwd { |
3480fbaa | 595 | my $pwd; |
39e571d4 | 596 | if (!defined &Dos::GetCwd) { |
3480fbaa DD |
597 | chomp($pwd = `command /c cd`); |
598 | $pwd =~ s:\\:/:g ; | |
39e571d4 | 599 | } else { |
3480fbaa | 600 | $pwd = Dos::GetCwd(); |
39e571d4 | 601 | } |
3480fbaa DD |
602 | $ENV{'PWD'} = $pwd; |
603 | return $pwd; | |
55497cff | 604 | } |
605 | ||
7fbf1995 | 606 | sub _qnx_cwd { |
35b807ef NA |
607 | local $ENV{PATH} = ''; |
608 | local $ENV{CDPATH} = ''; | |
609 | local $ENV{ENV} = ''; | |
3480fbaa DD |
610 | my $pwd = `/usr/bin/fullpath -t`; |
611 | chomp $pwd; | |
612 | $ENV{'PWD'} = $pwd; | |
613 | return $pwd; | |
7fbf1995 NA |
614 | } |
615 | ||
616 | sub _qnx_abs_path { | |
35b807ef NA |
617 | local $ENV{PATH} = ''; |
618 | local $ENV{CDPATH} = ''; | |
619 | local $ENV{ENV} = ''; | |
fa921dc6 | 620 | my $path = @_ ? shift : '.'; |
39741d73 MS |
621 | local *REALPATH; |
622 | ||
99f36a73 | 623 | defined( open(REALPATH, '-|') || exec '/usr/bin/fullpath', '-t', $path ) or |
39741d73 MS |
624 | die "Can't open /usr/bin/fullpath: $!"; |
625 | my $realpath = <REALPATH>; | |
626 | close REALPATH; | |
627 | chomp $realpath; | |
7fbf1995 NA |
628 | return $realpath; |
629 | } | |
630 | ||
09122b95 RGS |
631 | # Now that all the base-level functions are set up, alias the |
632 | # user-level functions to the right places | |
633 | ||
634 | if (exists $METHOD_MAP{$^O}) { | |
635 | my $map = $METHOD_MAP{$^O}; | |
636 | foreach my $name (keys %$map) { | |
99f36a73 | 637 | local $^W = 0; # assignments trigger 'subroutine redefined' warning |
09122b95 RGS |
638 | no strict 'refs'; |
639 | *{$name} = \&{$map->{$name}}; | |
640 | } | |
55497cff | 641 | } |
4633a7c4 | 642 | |
0a4d1779 TC |
643 | # built-in from 5.30 |
644 | *getcwd = \&Internals::getcwd | |
645 | if !defined &getcwd && defined &Internals::getcwd; | |
646 | ||
99f36a73 RGS |
647 | # In case the XS version doesn't load. |
648 | *abs_path = \&_perl_abs_path unless defined &abs_path; | |
a7a23d71 | 649 | *getcwd = \&_perl_getcwd unless defined &getcwd; |
99f36a73 RGS |
650 | |
651 | # added function alias for those of us more | |
652 | # used to the libc function. --tchrist 27-Jan-00 | |
653 | *realpath = \&abs_path; | |
4633a7c4 | 654 | |
a0d0e21e | 655 | 1; |
f4eedc6b DD |
656 | __END__ |
657 | ||
658 | =head1 NAME | |
659 | ||
660 | Cwd - get pathname of current working directory | |
661 | ||
662 | =head1 SYNOPSIS | |
663 | ||
664 | use Cwd; | |
665 | my $dir = getcwd; | |
666 | ||
667 | use Cwd 'abs_path'; | |
668 | my $abs_path = abs_path($file); | |
669 | ||
670 | =head1 DESCRIPTION | |
671 | ||
672 | This module provides functions for determining the pathname of the | |
673 | current working directory. It is recommended that getcwd (or another | |
674 | *cwd() function) be used in I<all> code to ensure portability. | |
675 | ||
676 | By default, it exports the functions cwd(), getcwd(), fastcwd(), and | |
677 | fastgetcwd() (and, on Win32, getdcwd()) into the caller's namespace. | |
678 | ||
679 | ||
680 | =head2 getcwd and friends | |
681 | ||
682 | Each of these functions are called without arguments and return the | |
683 | absolute path of the current working directory. | |
684 | ||
685 | =over 4 | |
686 | ||
687 | =item getcwd | |
688 | ||
689 | my $cwd = getcwd(); | |
690 | ||
d2e38af7 Z |
691 | Returns the current working directory. On error returns C<undef>, |
692 | with C<$!> set to indicate the error. | |
f4eedc6b DD |
693 | |
694 | Exposes the POSIX function getcwd(3) or re-implements it if it's not | |
695 | available. | |
696 | ||
697 | =item cwd | |
698 | ||
699 | my $cwd = cwd(); | |
700 | ||
701 | The cwd() is the most natural form for the current architecture. For | |
702 | most systems it is identical to `pwd` (but without the trailing line | |
703 | terminator). | |
704 | ||
705 | =item fastcwd | |
706 | ||
707 | my $cwd = fastcwd(); | |
708 | ||
709 | A more dangerous version of getcwd(), but potentially faster. | |
710 | ||
711 | It might conceivably chdir() you out of a directory that it can't | |
712 | chdir() you back into. If fastcwd encounters a problem it will return | |
713 | undef but will probably leave you in a different directory. For a | |
714 | measure of extra security, if everything appears to have worked, the | |
715 | fastcwd() function will check that it leaves you in the same directory | |
716 | that it started in. If it has changed it will C<die> with the message | |
717 | "Unstable directory path, current directory changed | |
718 | unexpectedly". That should never happen. | |
719 | ||
720 | =item fastgetcwd | |
721 | ||
722 | my $cwd = fastgetcwd(); | |
723 | ||
724 | The fastgetcwd() function is provided as a synonym for cwd(). | |
725 | ||
726 | =item getdcwd | |
727 | ||
728 | my $cwd = getdcwd(); | |
729 | my $cwd = getdcwd('C:'); | |
730 | ||
731 | The getdcwd() function is also provided on Win32 to get the current working | |
732 | directory on the specified drive, since Windows maintains a separate current | |
733 | working directory for each drive. If no drive is specified then the current | |
734 | drive is assumed. | |
735 | ||
736 | This function simply calls the Microsoft C library _getdcwd() function. | |
737 | ||
738 | =back | |
739 | ||
740 | ||
741 | =head2 abs_path and friends | |
742 | ||
743 | These functions are exported only on request. They each take a single | |
744 | argument and return the absolute pathname for it. If no argument is | |
745 | given they'll use the current working directory. | |
746 | ||
747 | =over 4 | |
748 | ||
749 | =item abs_path | |
750 | ||
751 | my $abs_path = abs_path($file); | |
752 | ||
753 | Uses the same algorithm as getcwd(). Symbolic links and relative-path | |
754 | components ("." and "..") are resolved to return the canonical | |
d2e38af7 Z |
755 | pathname, just like realpath(3). On error returns C<undef>, with C<$!> |
756 | set to indicate the error. | |
f4eedc6b DD |
757 | |
758 | =item realpath | |
759 | ||
760 | my $abs_path = realpath($file); | |
761 | ||
762 | A synonym for abs_path(). | |
763 | ||
764 | =item fast_abs_path | |
765 | ||
766 | my $abs_path = fast_abs_path($file); | |
767 | ||
768 | A more dangerous, but potentially faster version of abs_path. | |
769 | ||
770 | =back | |
771 | ||
772 | =head2 $ENV{PWD} | |
773 | ||
774 | If you ask to override your chdir() built-in function, | |
775 | ||
776 | use Cwd qw(chdir); | |
777 | ||
778 | then your PWD environment variable will be kept up to date. Note that | |
779 | it will only be kept up to date if all packages which use chdir import | |
780 | it from Cwd. | |
781 | ||
782 | ||
783 | =head1 NOTES | |
784 | ||
785 | =over 4 | |
786 | ||
787 | =item * | |
788 | ||
789 | Since the path separators are different on some operating systems ('/' | |
790 | on Unix, ':' on MacPerl, etc...) we recommend you use the File::Spec | |
791 | modules wherever portability is a concern. | |
792 | ||
793 | =item * | |
794 | ||
795 | Actually, on Mac OS, the C<getcwd()>, C<fastgetcwd()> and C<fastcwd()> | |
796 | functions are all aliases for the C<cwd()> function, which, on Mac OS, | |
797 | calls `pwd`. Likewise, the C<abs_path()> function is an alias for | |
798 | C<fast_abs_path()>. | |
799 | ||
800 | =back | |
801 | ||
802 | =head1 AUTHOR | |
803 | ||
804 | Originally by the perl5-porters. | |
805 | ||
806 | Maintained by Ken Williams <KWILLIAMS@cpan.org> | |
807 | ||
808 | =head1 COPYRIGHT | |
809 | ||
810 | Copyright (c) 2004 by the Perl 5 Porters. All rights reserved. | |
811 | ||
812 | This program is free software; you can redistribute it and/or modify | |
813 | it under the same terms as Perl itself. | |
814 | ||
815 | Portions of the C code in this library are copyright (c) 1994 by the | |
816 | Regents of the University of California. All rights reserved. The | |
817 | license on this code is compatible with the licensing of the rest of | |
818 | the distribution - please see the source code in F<Cwd.xs> for the | |
819 | details. | |
820 | ||
821 | =head1 SEE ALSO | |
822 | ||
823 | L<File::chdir> | |
824 | ||
825 | =cut |