tclxml-users

[Tclxml-users] Activestate Tcl segvs using TclDOM

[Derek F. <fo...@hu...>]

I've got ActiveTcl-8.3.4.3 on a Linux box, and tried to run this script:

---
#!/bin/sh
# \
exec tclsh8.3 "$0" "$@"

package require xml
package require dom 2.2
package require Tclx

set xml [read_file "wrapper.xml" 1024]
set docNode [dom::DOMImplementation parse $xml]

puts [dom::node cget $docNode -nodeType]
---

(I've upgraded my TclDOM to 2.2, but 2.0 did this too.) My XML file 
"wrapper.xml" looks like this:

---
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE wrapper [
<!ELEMENT wrapper          (wrappedbit+)>
<!ELEMENT wrappedbit       (#PCDATA)>

<!ENTITY bit SYSTEM "wrappedbit.xml">
]>
<wrapper>
  &bit;
</wrapper>
---

and the "wrappedbit.xml" contains:

---
<wrappedbit>Hello world</wrappedbit>
---

When I run the script, I get a segv back. There's no core.

Can anyone with a bit more knowledge confirm and/or tell what the problem is?

-- 
The past: Smart users in front of dumb terminals

Re: [Tclxml-users] Activestate Tcl segvs using TclDOM

[Steve B. <Ste...@zv...>]

Derek Fountain wrote:
> I've got ActiveTcl-8.3.4.3 on a Linux box, and tried to run this script:
[...snip...]
> When I run the script, I get a segv back. There's no core.

TclDOM is all-Tcl, so it would be surprising to get a
segv.  However, ActiveTcl includes TclExpat (the expat
wrapper for TclXML).  I suspect that it is TclXML/expat
segv'ing while parsing the XML document.

Try parsing using the Tcl parser, ie

set doc [dom::parse $xml -parser tcl]

Just a couple of days ago I managed to compile TclXML/expat
on my MacOSX m/c and core dumps are occurring in the
markup declaration code (exactly what was described in the
c.l.t. postings).  Investigations are underway, but getting
the Tcl2K2 paper written takes higher priority ;-)

Cheers,
Steve Ball

-- 
Steve Ball            |   XSLT Standard Library   | Training & Seminars
Zveno Pty Ltd         |     Web Tcl Complete      |   XML XSL Schemas
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Ste...@zv...  +---------------------------+---------------------
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Re: [Tclxml-users] Activestate Tcl segvs using TclDOM

[Derek F. <fo...@hu...>]

> TclDOM is all-Tcl, so it would be surprising to get a
> segv.  However, ActiveTcl includes TclExpat (the expat
> wrapper for TclXML).  I suspect that it is TclXML/expat
> segv'ing while parsing the XML document.

Someone on c.l.t reproduced it with a core, and the crash was indeed in that 
TclExpat thing. I compiled a Tcl-8.3.4.3 from scratch and it didn't fail 
there.

> Try parsing using the Tcl parser, ie
>
> set doc [dom::parse $xml -parser tcl]

Ah! That makes the problem go away, at least in a quick test I just ran. 
That's great - I was in an embarrassing hole for a while there. Thanks.

-- 
The past: Smart users in front of dumb terminals