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Bug #23894 sprinf format Problem
Submitted: 2003-05-30 05:12 UTC Modified: 2003-05-30 08:51 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: s dot masugata at digicom dot dnp dot co dot jp Assigned:
Status: Closed Package: Strings related
PHP Version: 4.3.2 OS: RedHat Linux6.2J
Private report: No CVE-ID: None
View Developer Edit
 [2003-05-30 05:12 UTC] s dot masugata at digicom dot dnp dot co dot jp 
Operation of sprintf is amusing.
<?
$A = -1;
echo bin2hex( sprintf( "%02d:", $A ) );
phpinfo( );
?>

reslt:[2d31003a]

NULL is added.
It's satisfactory at 4.1.2 or 4.3.1.

An environmental problem?

Patches

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 [2003-05-30 08:22 UTC] s dot masugata at digicom dot dnp dot co dot jp 
printf does not operate, either.

<?
$A = -1;
printf( "%02d:", $A );
?>

reslt:[-1]

4.1.2 or 4.3.1:

reslt:[-1:]
 [2003-05-30 08:24 UTC] [email protected] 
No, it doesn't look like an environmental problem. sprintf() and printf() indeed append an extra NUL character for negative numbers:

% LC_ALL=C php -r '
printf( "%03d\n", -1 );
' | xxd
0000000: 2d30 3100 0a                             -01..

It happens also with "%02f" format.
 [2003-05-30 08:28 UTC] s dot masugata at digicom dot dnp dot co dot jp 
Similarly, neither vsprintf nor vprintf also operates.

<?
$A = -1;

$Array[0] = $A;
echo bin2hex( vsprintf( "%02d:", $Array ) );

vprintf( "%02d:", $Array );
?>

reslt:[2d31003a]
reslt:[-1]

4.1.2 or 4.3.1:

reslt:[2d313a]
reslt:[-1:]
 [2003-05-30 08:39 UTC] s dot masugata at digicom dot dnp dot co dot jp 
Thank you very much for Reply.

Since this function group is likely to be used quite extensively,
the influence range seems to be large.

A cause was not found although many things were investigated individually.

I'm sorry that reporting is only always possible.
 [2003-05-30 08:51 UTC] [email protected] 
This bug has been fixed in CVS.

In case this was a PHP problem, snapshots of the sources are packaged
every three hours; this change will be in the next snapshot. You can
grab the snapshot at http://snaps.php.net/.
 
In case this was a documentation problem, the fix will show up soon at
http://www.php.net/manual/.

In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites in short time.
 
Thank you for the report, and for helping us make PHP better.
 
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