#49244 [NEW]: Floating point NaN cause garbage characters

From: Date: Thu, 13 Aug 2009 14:14:51 +0000
Subject: #49244 [NEW]: Floating point NaN cause garbage characters
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-141027@lists.php.net to get a copy of this message 
From:             ronlentjes at yahoo dot com dot au
Operating system: Linux Fedora 8
PHP version:      5.3.0
PHP Bug Type:     Scripting Engine problem
Bug description:  Floating point NaN cause garbage characters

Description:
------------
This has been an issue since 4.2.2 and still in 5.3.0.

$d = pow (-1.0, 0.3);  // or anything causing NaN
echo "$d\n";
 -> NAN
printf ("%f\n", $d);
(4.2.2) -> crash
(5.2.4) -> NaN<big-box><little-box><E-with-backslash-on-top>
(5.3.0) -> NaN<hex EF BF BD><hex EF BF BD><hex EF BF BD>
             (viewed in browser as NaN???)

Two issues here:
Inconsistent display of NAN for echo and NaN for printf.
Output of bogus characters after the 3 letters NaN for printf.

I think you are missing a '\0' null termination after the NaN characters
which probably cause a runaway to crash 4.2.2 but is just 'hanging' in
there for the newer versions.

Cheers,
Ron Lentjes
LC CLS.


Reproduce code:
---------------
$d = pow (-1.0, 0.3);
echo "$d\n";
printf ("%f\n", $d);


Expected result:
----------------
NaN
NaN

Actual result:
--------------
(4.2.2)
NAN
crash

(5.2.4)
NAN
NaN<big-box><little-box><E-with-backslash-on-top>

(5.3.0)
NAN
NaN<hex EF BF BD><hex EF BF BD><hex EF BF BD>
      (viewed in browser as NaN???)


-- 
Edit bug report at http://bugs.php.net/?id=49244&edit=1
-- 
Try a snapshot (PHP 5.2):            http://bugs.php.net/fix.php?id=49244&r=trysnapshot52
Try a snapshot (PHP 5.3):            http://bugs.php.net/fix.php?id=49244&r=trysnapshot53
Try a snapshot (PHP 6.0):            http://bugs.php.net/fix.php?id=49244&r=trysnapshot60
Fixed in SVN:                        http://bugs.php.net/fix.php?id=49244&r=fixed
Fixed in SVN and need be documented: http://bugs.php.net/fix.php?id=49244&r=needdocs
Fixed in release:                    http://bugs.php.net/fix.php?id=49244&r=alreadyfixed
Need backtrace:                      http://bugs.php.net/fix.php?id=49244&r=needtrace
Need Reproduce Script:               http://bugs.php.net/fix.php?id=49244&r=needscript
Try newer version:                   http://bugs.php.net/fix.php?id=49244&r=oldversion
Not developer issue:                 http://bugs.php.net/fix.php?id=49244&r=support
Expected behavior:                   http://bugs.php.net/fix.php?id=49244&r=notwrong
Not enough info:                     http://bugs.php.net/fix.php?id=49244&r=notenoughinfo
Submitted twice:                     http://bugs.php.net/fix.php?id=49244&r=submittedtwice
register_globals:                    http://bugs.php.net/fix.php?id=49244&r=globals
PHP 4 support discontinued:          http://bugs.php.net/fix.php?id=49244&r=php4
Daylight Savings:                    http://bugs.php.net/fix.php?id=49244&r=dst
IIS Stability:                       http://bugs.php.net/fix.php?id=49244&r=isapi
Install GNU Sed:                     http://bugs.php.net/fix.php?id=49244&r=gnused
Floating point limitations:          http://bugs.php.net/fix.php?id=49244&r=float
No Zend Extensions:                  http://bugs.php.net/fix.php?id=49244&r=nozend
MySQL Configuration Error:           http://bugs.php.net/fix.php?id=49244&r=mysqlcfg

Thread (14 messages)

« previous php.bugs (#141027) next »