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List:       kfm-devel
Subject:    CSSStyleSheetImpl::doc() can be uninitialized???
From:       Martijn Klingens <mklingens () ism ! nl>
Date:       2001-10-24 15:49:33
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While cleaning up my media code I removed the tossing around of the currently 
used media type. Instead, I just retrieve it from the document that is part 
of a stylesheet.

However, this gives me an instant crash while khtml tries to load the default 
style sheet. I haven't had time to look deep into it, but I have the feeling 
that the doc() pointer is null. If that's true, what's the recommended way to 
solve this?

The offending function is the following:

-----
void CSSStyleSelectorList::append( CSSStyleSheetImpl *sheet )
{
    if(!sheet || !sheet->isCSSStyleSheet()) return;

    MediaListImpl *media = sheet->media();
    bool correctMedium = false;
    DOMString curMedium = sheet->doc()->mediaType();

    int length = media ? media->length() : 0;
    if( length == 0 )
        correctMedium = true;   // no media implies "all"

    // ... etc ...
-----

Relevant backtrace is
-----
(no debugging symbols found)...
#0  0x40eef5a9 in __wait4 () from /lib/libc.so.6
#1  0x40f57ad8 in __DTOR_END__ () from /lib/libc.so.6
#2  0x406dbfe5 in KCrash::defaultCrashHandler ()
   from /usr/local/kde/lib/libkdecore.so.3
#3  <signal handler called>
#4  0x408c51f9 in QString::QString () from /usr/lib/qt2//lib/i686/libqt.so.2
#5  0x411a42d9 in DOM::DocumentImpl::mediaType ()
    at libkhtml_la_meta_unload.cc:14
#6  0x41231805 in khtml::CSSStyleSelectorList::append ()
    at libkhtml_la_meta_unload.cc:14
#7  0x4122f88a in khtml::CSSStyleSelector::loadDefaultStyle ()
    at libkhtml_la_meta_unload.cc:14
#8  0x4122f0c8 in khtml::CSSStyleSelector::CSSStyleSelector ()
    at libkhtml_la_meta_unload.cc:14
#9  0x411cccc3 in DOM::HTMLDocumentImpl::HTMLDocumentImpl ()
    at libkhtml_la_meta_unload.cc:14
-----

Martijn

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