ID: 36741
Updated by: [EMAIL PROTECTED]
Reported By: elliot dot li at gmail dot com
-Status: Open
+Status: Feedback
Bug Type: Streams related
Operating System: Linux
PHP Version: 5.1.2
New Comment:
Do you have a patch? (unified diff, please)
Previous Comments:
------------------------------------------------------------------------
[2006-03-15 05:58:13] elliot dot li at gmail dot com
Description:
------------
This case(php-5.1.2/ext/standard/tests/file/userstreams.phpt) generates
a bunch of random numbers and use them as offsets for fseek() test on a
userstream. However, the range of these random numbers is [0,
$DATALEN](rand(0, $DATALEN)), which should be [0, $DATALEN).
======== CODE SNIP FOLLOWS ========
/* generate some random seek offsets */
$position = 0;
for ($i = 0; $i < 256; $i++) {
$whence = $whence_map[array_rand($whence_map, 1)];
switch($whence) {
case SEEK_SET:
$offset = rand(0, $DATALEN);
$position = $offset;
break;
case SEEK_END:
$offset = -rand(0, $DATALEN);
$position = $DATALEN + $offset;
break;
case SEEK_CUR:
$offset = rand(0, $DATALEN);
$offset -= $position;
$position += $offset;
break;
}
$seeks[] = array($whence, $offset, $position);
}
======== CODE SNIP ABOVE ========
Reproduce code:
---------------
Run this case on and on for a while, you can encounter this problem. I
found this problem during a regression test, and reproduced it on my
PC(Pentium 4 2.6GHz) within one day.
Expected result:
----------------
No error should be reported if everything goes OK.
Actual result:
--------------
========= LOG SNIP FOLLOWS =========
--[34] whence=SEEK_SET offset=32550 line_length=1024
position_should_be=32550 --
REAL: pos=(29175,32550,32550) ret=0 line[0]=`'
USER: pos=(29175,29175,29175) ret=0 line[16]=`zl urnq vf ubzr
'
###################################### FAIL!
========= LOG SNIP ABOVE =========
32550 is the total length of the userstream, so fseek($fp, 32550,
SEEK_SET) must fail.
I noticed another problem: mystream.stream_seek() would return a false
on this condition, but the return value of fseek() is still 0! This
would lead to the result that the failure of seeking in a userstream
couldn't be noticed by the main program.
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=36741&edit=1
