| 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; |