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List:       kde-devel
Subject:    Re: Desperate in need of help: Very very weird problem with sscanf
From:       Thiago Macieira <thiago () kde ! org>
Date:       2009-08-20 5:47:54
Message-ID: 200908200748.03370.thiago () kde ! org
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Sebastian Trüg wrote:
>On Wednesday 19 August 2009 17:21:26 Rafael Fernández López wrote:
>> Hi,
>>
>> > I am having a look at it. It doesn't seem to be libnepomuk, but
>> > libkdecore.
>>
>> Pretty strange. My only guess at the moment is that in kdecore there
>> could be a static symbol (or extern) defined with the same name as
>> some symbol used by sscanf (and being initializated on declaration)...
>>
>> I am curious about this issue... If someone finds something, please
>> step forward ;) /me is still having a look though
>
>The following patch "fixes" the issue. I do not know enough about
> locales to make an informed decision about a real solution.

Well, it actually *hides* the issue.

The code you commented out is correct.

The problem is that Sebastian's code is using a locale-dependent function 
(sscanf) with a C-locale-encoded string. Sorry, that won't work.

You need to either find a function that is locale-independent or you need 
to encode your strings with the locale decimal-separator. Note that it can 
change in time, since users may change locales.

Another alternative is to change the libc locale via setlocale(3) but note 
that it's a global change, affecting all threads. Make sure you never run 
that once the app is up and running.

>--- kdecore/localization/kcatalog.cpp   (revision 1013365)
>+++ kdecore/localization/kcatalog.cpp   (working copy)
>@@ -45,7 +45,7 @@
>     s_localeSet = true;
>     return 1;
> }
>-Q_CONSTRUCTOR_FUNCTION(kInitializeLocale)
>+//Q_CONSTRUCTOR_FUNCTION(kInitializeLocale)
>
> // not defined on win32 :(
> #ifdef _WIN32
>
>Apparently LC_ALL is reset once kdecore is loaded.
>
>Cheers,
>Sebastian
>
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-- 
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
  Senior Product Manager - Nokia, Qt Development Frameworks
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