FUDforum
Fast Uncompromising Discussions. FUDforum will get your users talking.

Home » Imported messages » comp.lang.php » signed int64 pack/unpack
Show: Today's Messages :: Polls :: Message Navigator
Return to the default flat view Create a new topic Submit Reply
Re: signed int64 pack/unpack [message #184589 is a reply to message #184588] Sun, 12 January 2014 03:15 Go to previous messageGo to previous message
Jerry Stuckle is currently offline  Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
Senior Member
On 1/11/2014 10:11 PM, Ben Bacarisse wrote:
> Jerry Stuckle <jstucklex(at)attglobal(dot)net> writes:
>
>> On 1/11/2014 9:42 PM, Ben Bacarisse wrote:
>>> cameron7(at)gmail(dot)com writes:
>>>
>>>> I'm having a bit of trouble figuring out a straightforward way to
>>>> "pack" / "unpack" a signed int64.
>>>>
>>>> I'm on a 64-bit machine, but the 'i' and 'I' are coming back with
>>>> 4-byte length.
>>>
>>> There is no explicit format for 64-bit ints. The i/I formats are used
>>> for a native "int" but that need not be 64 bits on a 64-bit machine.
>>> The function is borrowed from Perl whose documentation says a bit more
>>>
>>> This 'integer' is _at_least_ 32 bits wide. Its exact size depends on
>>> what a local C compiler calls 'int'.
> ^^^^^^^^^^^^^^^^^^^^^^^^^^^
>>> On my 64-bit Linux machine, 'int' is 32 bits.
>>
>> On my 64 bit Linux system, 'int' is 64 bits. But then I have the 64
>> bit PHP version (and 64 bit OS) loaded.
>
> Yes, me too.
>
>> What do you get when you do:
>>
>> <?php
>> echo PHP_INT_MAX . "\n";
>> ?>
>
> Same as you but I don't think that's relevant. PHP stores values
> internally using a C long. I think the Perl document describes what's
> really happening.
>

It is totally relevant. You can't operate on 64 bit values if you don't
have 64 bit support.

And this is PHP, not Perl. Things have changed a *lot* since the
original versions were created. Much of the Perl documentation no
longer applies to PHP (if it ever did).

--
==================
Remove the "x" from my email address
Jerry Stuckle
jstucklex(at)attglobal(dot)net
==================
[Message index]
 
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Read Message
Previous Topic: how did I wind up with double headers?
Next Topic: Switch question
Goto Forum:
  

-=] Back to Top [=-
[ Syndicate this forum (XML) ] [ RSS ]

Current Time: Sun Nov 24 02:37:46 GMT 2024

Total time taken to generate the page: 0.05260 seconds