ID: 31465
User updated by: php-bug-31247 at ryandesign dot com
Reported By: php-bug-31247 at ryandesign dot com
Status: Open
Bug Type: Unknown/Other Function
Operating System: N/A
PHP Version: 5.0.3
New Comment:
I've analyzed the PHP 5.0.3 source code and believe I
have identified the problem. Here's my following of the
logic in /etc/standard/pack.c, given an unpack string
like "H*hex":
- On line 540, variable "inputpos" is set to 0.
- On line 564, since the format argument is "*",
variable "arg" is set to -1.
- On line 601, variable "size" is set to the same value
as "arg", so "size" is now -1.
- On line 832, "size" is added to "inputpos", so
"inputpos" decreases by one and is now -1.
- On line 833, if "inputpos" is < 0 (which it is) an
error is shown. This error display is one of the
changes between PHP 4.3.9 and 5.0.3. This error
display would seem to be what we're seeing in this
case.
Previous Comments:
------------------------------------------------------------------------
[2005-01-10 05:07:06] php-bug-31247 at ryandesign dot com
Description:
------------
I am experiencing the problem reported in bug 31247,
which was marked as bogus. The decision was that the
user's compiler was broken. I challenge this decision,
as I see the problem with the (php.net-endorsed)
precompiled Mac OS X version of PHP 5.0.3 (release 1)
from www.entropy.ch and also with PHP 4.3.10 installed
on a Gentoo server. I don't think all of these
compilers are broken. I don't see the problem with
Entropy PHP 4.3.9 (release 2) nor with 4.3.9 on a
different Gentoo server.
I wonder whether the problem really relates to the
break-statement-within-the-braces notation, because this
notation is already present in PHP 4.3.9 which does not
exhibit the problem. Regardless, I consider braces
around cases within a switch to be poor form, and
encourage developers I work with to not use it, as it
gives the false impression to the uninitiated (which is
often the person writing the code) that closing the
brace closes the case (which of course it doesn't; the
break actually does that).
Reproduce code:
---------------
php -r "print_r(unpack('H*hex', 'data'));"
Expected result:
----------------
Array
(
[hex] => 64617461
)
Actual result:
--------------
Warning: unpack(): Type H: outside of string in Command
line code on line 1
Array
(
[hex] => 64617461
)
------------------------------------------------------------------------
--
Edit this bug report at http://bugs.php.net/?id=31465&edit=1
