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Re: Major problems with string handling in expat

• From: James Clark <jjc@j...>
• To: XML-Dev Mailing list <xml-dev@x...>
• Date: Sun, 02 Jul 2000 08:44:53 +0700

Try the version in:

  http://thaiopensource.com/dist/expat/test/

It fixes a bug that sounds like the one you're encountering.

Martin Gudgin wrote:
> 
> Hi Everyone,
> 
> In trying to use expat a lot recently we have found lots of problems with
> shallow copies of pointers into string pools in addition to a couple of
> wchar_t bugs.
> 
> We're especially interested to know if anyone has fixes for the string
> pointer bugs.
> 
> We think it's a couple of days work to fix the problems and none has fixes
> already we'll do the work and pass the resulting code on the jjc. We just
> want to avoid duplicating what someone has already done if possible.
> 
> When the PREFIX is added to the hash table the string is only a shallow copy
> and it doesn't take much for the pointers to get trashed when the buffers
> get reallocated in the pool. This means the pointer to the string containing
> the URI is pointing to garbage and consequently the URI never gets matched
> :-(
> 
> The problem is fairly random but we come across it when doing a lot of
> namespace work. One simple test case is;
> 
> <foo xmlns='http://marting.develop.com/foo' xml:lang='en-us'/>
> 
> where the nsuri for the xml namespace which expat pre-caches gets trashed
> and the attribute is fed to the application with the xml prefix instead of
> the nsuri.
> 
> We're using expat 1.1 ( latest source file date stamp 29th May 1999 )
> 
> Regards
> 
> Don Box and Martin Gudgin
> DevelopMentor
> 
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