From kde-devel  Fri May 08 00:58:46 2009
From: Thiago Macieira <thiago () kde ! org>
Date: Fri, 08 May 2009 00:58:46 +0000
To: kde-devel
Subject: Re: QString::localeAwareCompare() in KDE
Message-Id: <200905080258.54017.thiago () kde ! org>
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Peter Penz wrote:
>I tracked down the problem to QString::localeAwareCompare(), which is
> used in KStringHandler::naturalCompare(). When replacing
>QString::localeAwareCompare(a, b) by a.compare(b) the strings above are
> sorted correctly, however obviously the capability of locale aware
> comparing is lost...
>
>My guess is that in the context of a KDE application a different locale-
>mapping-table is used as when executing the unit test.
>
>Is somebody familiar with this topic and knows how I can convince the
> unit test to run with the same locale settings as a KDE application? I
> tried QLocale::setDefault(...) but the unit test always passes
> correctly...

This is localeAwareCompare for Unix (which aren't Macs):

    int delta =3D strcoll(toLocal8Bit_helper(data1, length1),=20
toLocal8Bit_helper(data2, length2));

    if (delta =3D=3D 0)
        delta =3D ucstrcmp(data1, length1, data2, length2);
    return delta;

As you can see, it's basically calling strcoll(3), which is a C library=20
function. Setting the default QLocale will have no effect: you have to set=
=20
the C library's locale, via setlocale(3).

In any case, the sorting you find weird is coming from glibc. There's=20
little we can do.
=2D-=20
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
    PGP/GPG: 0x6EF45358; fingerprint:
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