ID: 37350
User updated by: k95vz5f02 at sneakemail dot com
Reported By: k95vz5f02 at sneakemail dot com
-Status: Feedback
+Status: Closed
Bug Type: Filesystem function related
Operating System: Windows XP SP2
PHP Version: 5.1.4
New Comment:
Perfect, thanks for fixing this.
Tests done to verify, using the windows version linked to above [PHP
5.2.0RC5-dev (cli) (built: Sep 27 2006 00:22:40)]:
realpath("C:\\Program Files") => C:\Program Files
realpath("c:\\PrOgRaM fIlEs") => C:\Program Files
realpath("C:\\program files\\") => C:\Program Files
realpath("C:/program files/") => C:\Program Files
realpath("C:\\pRoGrA~1") => C:\Program Files
realpath("c:\\windows") => C:\WINDOWS
realpath("c:\\wInDoWs\\DoWnLoAdEd PrOgRaM fIlEs\\") =>
C:\WINDOWS\Downloaded Program Files
Previous Comments:
------------------------------------------------------------------------
[2006-09-26 22:18:42] [EMAIL PROTECTED]
Please try using this CVS snapshot:
http://snaps.php.net/php5.2-latest.tar.gz
For Windows:
http://snaps.php.net/win32/php5.2-win32-latest.zip
------------------------------------------------------------------------
[2006-06-23 17:19:53] k95vz5f02 at sneakemail dot com
On further investigation, realpath doesn't consistently canonicalize
the case at all on Windows, I've updated the summary accordingly.
First to remember the need for this: the documentation definition for
realpath is "Returns canonicalized absolute pathname", and Wikipedia
defines canonicalization as
"Canonicalization (abbreviated c14n) is the process of converting data
that has more than one possible representation into a "standard"
canonical representation. This can be done to compare different
representations for equivalence (...)"
So clearly case should be converted to a standard form on platforms
such as Windows that are case-insensitive, and indeed Windows stores
the preferred case for every file, for example the standard directory
'C:\Program Files' should be capitalised like that, rather than, e.g.
'C:\program files' or 'C:\PROGRAM FILES', whereas 'C:\WINDOWS' is the
preferred case for that directory (on Win XP at least).
Tests:
1. realpath("C:\\Program Files") => C:\Program Files
2. realpath("c:\\PrOgRaM fIlEs") => c:\PrOgRaM fIlEs
3. realpath("C:\\program files\\") => C:\program files
4. realpath("C:/program files/") => C:\program files
5. realpath("C:\\pRoGrA~1") => C:\Program Files
6. realpath("c:\\windows") => c:\WINDOWS
7. realpath("c:\\wInDoWs\\DoWnLoAdEd PrOgRaM fIlEs\\") =>
c:\WINDOWS\DoWnLoAdEd PrOgRaM fIlEs
Conclusion:
realpath deals with slashes consistently, but it only canonicalizes the
case of short filenames (as well as expanding them), not long file names
(anything more than 8.3, or with a space, etc); and it never capitalizes
the drive letter as it should.
A possible solution, if slightly inefficient, would be to convert path
components into short (8.3) form then apply the normal realpath logic.
------------------------------------------------------------------------
[2006-06-23 11:13:39] hanskrentel at yahoo dot de
within the windows OS there is no difference between cAsE in filenames,
a solution might be to read out the actual filename from the system and
return it by realpath.
but this won't be a valid solution afterall: next to case ignorance,
there are two filenames for a file as well: the long and the short
(8.3) one (since win/32/95 or FAT 32). so i guess a comparison will
fail in that case anyway.
additionally, for me another problem occurs:
c:\windows is a directory and could be name as c:\windows\ as well (in
my opinion it even should but that's my personal opinion anyway).
since for me there is no logical correct solution for this problem
anyway I would suggest to handle the windows filesystem more similar to
the *nix one, that meaning using / instead of \ for example to point to
directories with the needed / at the end. additionally, a virtual root
might be good idea as well sothat "c:\windows" would be "/c:/windows/"
afterall. this would help developers to create better cross platform
code. this might be already discussed somewhere else maybe.
------------------------------------------------------------------------
[2006-05-07 18:41:58] [EMAIL PROTECTED]
Realpath is also used internally for f.e. include_once, so this should
be looked into.
------------------------------------------------------------------------
[2006-05-07 18:08:28] k95vz5f02 at sneakemail dot com
Description:
------------
The realpath function doesn't canonicalize the case of the drive letter
on Windows (and possibly on certain other platforms).
For example:
realpath('C:\WINDOWS') returns 'C:\WINDOWS'
but realpath('c:\WINDOWS') returns 'c:\WINDOWS'
(note the different case of the 'C:')
Hence comparing realpaths cannot reliably be used to check that two
files are the same on Windows.
Reproduce code:
---------------
echo (realpath('C:\WINDOWS')==realpath('c:\WINDOWS')) ? "true" :
"false";
Expected result:
----------------
true
Actual result:
--------------
false
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--
Edit this bug report at http://bugs.php.net/?id=37350&edit=1
