ID: 42036
User updated by: kraghuba at in dot ibm dot com
Reported By: kraghuba at in dot ibm dot com
-Status: No Feedback
+Status: Open
Bug Type: Filesystem function related
Operating System: RHEL 5
PHP Version: 5CVS-2007-07-18 (snap)
Assigned To: wez
New Comment:
I have tried similar stuff on C language and and found that feof
doesn't get changed by using fgetc() on file opened in write only mode.
The documentation of fgetc() for C says that it returns an int or EOF on
end of the file or an *error*.
I haven't have enough time to look at any other version other than php6
and 5 (:
I think that same thing can be done for php, the application level
error should be reported as false and this should be documented. Even
other wise if you decide to have the EOF as application level error then
it should be documented.
Sample code that i use for checking it fgetc() on C :
#include <stdio.h>
int main ( void )
{
FILE *fp;
char ch;
fp = fopen("test.txt", "w");
fwrite("testing", 7, 1, fp);
rewind(fp);
printf("\nftell() returns = %d\n", ftell(fp) );
printf("\nfeof() returns = %s\n", ( feof(fp) ? "true" : "false") );
// try read
printf("\nfgets() returns = %d\n", fgetc(fp) );
printf("\nftell() returns = %d\n", ftell(fp) );
printf("\nfeof() returns = %s\n", ( feof(fp) ? "true" : "false") );
fclose(fp);
}
Output:
ftell() returns = 0
feof() returns = false
fgets() returns =-1
ftell() returns = 0
feof() returns = false
Previous Comments:
------------------------------------------------------------------------
[2007-07-31 01:00:01] php-bugs at lists dot php dot net
No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".
------------------------------------------------------------------------
[2007-07-23 14:47:48] [EMAIL PROTECTED]
Without having had time to dig deeper just yet, if you open for write
only, you shouldn't expect to be able to read. This application-level
error is reflected as EOF.
So the question becomes, is this behavior different from libc, and did
the php behavior change between releases? (I'm not including PHP 6 in
that, because it is not released yet)
If the latter, we need to fix it, it not, we probably shouldn't fix it
if there's a risk of breaking an app.
I'm leaning towards won't fix; you should open the file as you intend
to use it.
------------------------------------------------------------------------
[2007-07-23 08:34:56] [EMAIL PROTECTED]
Wez, could you plz comment this?
------------------------------------------------------------------------
[2007-07-21 05:55:08] kraghuba at in dot ibm dot com
This defect is also applicable to the function fgets().
------------------------------------------------------------------------
[2007-07-18 16:48:08] kraghuba at in dot ibm dot com
Description:
------------
fgetc() sets the end of the file flag to ture when reading from a file
which opened in write only mode.
This failure is applicable on php5 and php6
php version:
PHP 6.0.0-dev (cli) (built: Jul 18 2007 20:53:03) (GCOV)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v3.0.0-dev, Copyright (c) 1998-2007 Zend Technologies
&
PHP 5.2.4-dev (cli) (built: Jul 18 2007 20:49:53) (GCOV)
Copyright (c) 1997-2007 The PHP Group
Zend Engine v2.2.0, Copyright (c) 1998-2007 Zend Technologies
OS : RHEL 5
configure setup:
./configure --enable-gcov
Reproduce code:
---------------
<?php
$fp = fopen("test.txt", "w");
var_dump( fwrite($fp, "Text") );
// rewind the file pointer to begining
var_dump( rewind($fp) );
var_dump( ftell($fp) );
var_dump( feof($fp) );
// try to read
var_dump( fgetc($fp) );
var_dump( ftell($fp) );
var_dump( feof($fp) );
fclose($fp);
unlink("test.txt");
?>
Expected result:
----------------
output - php5:
--------------
int(4)
bool(true)
int(0)
bool(false)
bool(false)
int(0)
bool(false)
output - php6:
--------------
int(4)
bool(true)
int(0)
bool(false)
bool(false)
int(0)
bool(false)
Actual result:
--------------
output - php5:
--------------
int(4)
bool(true)
int(0)
bool(false)
bool(false)
int(0)
bool(true)
output - php6:
--------------
int(4)
bool(true)
int(0)
bool(false)
string(1) ""
int(0)
bool(true)
output on php6 when run using run-test.php :
int(4)
bool(true)
int(0)
bool(false)
string(1) "ΓΏ"
int(0)
bool(true)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=42036&edit=1
