[Xsb-development] [ xsb-Bugs-1542382 ] libwww interface bug

[SourceForge.net <no...@so...>]

Bugs item #1542382, was opened at 2006-08-17 23:07
Message generated for change (Comment added) made by kifer
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101176&aid=1542382&group_id=1176

Please note that this message will contain a full copy of the comment thread,
including the initial issue submission, for this request,
not just the latest update.
Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Daniel Mahler (dmahler)
Assigned to: Nobody/Anonymous (nobody)
Summary: libwww interface bug 

Initial Comment:
I have installed xsb-3.0.1 with libwww support 
enabled by

./configure --with-libwww=/usr

When i try tu run the libwww examples that come with 
the distribution
i get

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
dm@localhost ~/XSB/examples/libwww $ xsb testsuite
[xsb_configuration loaded]
[sysinitrc loaded]
[libwww loaded]
[libwww_init loaded]
[libwwwconfig loaded]
[Compiling C 
file /home/dm/XSB/packages/libwww/cc//libwww_parse_xml.c 
using gcc]
/home/dm/XSB/packages/libwww/cc//libwww_parse_xml.c: 
In function `xml_addText':
/home/dm/XSB/packages/libwww/cc//libwww_parse_xml.c:178: 
error: too
few arguments to function `c2p_chars'
[Compiling C 
file /home/dm/XSB/packages/libwww/cc//libwww_parse_rdf.c 
using gcc]
[Compiling C 
file /home/dm/XSB/packages/libwww/cc//libwww_parse_html.c
using gcc]
/home/dm/XSB/packages/libwww/cc//libwww_parse_html.c: 
In function
`html_addText':
/home/dm/XSB/packages/libwww/cc//libwww_parse_html.c:141: 
error: too
few arguments to function `c2p_chars'
++Error[XSB/Runtime/P]: [Existence (No module 
libwww_request exists)]
Module libwww_request is not found in XSB library 
directories

End XSB (cputime 0.04 secs, elapsetime 0.41 secs)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

And when I grep for the offending c2p_chars I get

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
dm@localhost ~/XSB/examples/libwww $ find ~/XSB -name 
'*.[hc]' | xargs
grep -n c2p_chars
/home/dm/XSB/emu/cinterf.c:513:DllExport void 
call_conv
c2p_chars(CTXTdeclc char *str, int regs_to_protect, 
prolog_term term)
/home/dm/XSB/emu/cinterf.c:515:  
c_string_to_p_charlist(CTXTc
str,term,regs_to_protect,"c2p_chars", "char* -> 
list");
/home/dm/XSB/emu/cinterf.c:1376:  c2p_chars(CTXTc 
goal,2,reg_term(CTXTc 1));
/home/dm/XSB/emu/cinterf.h:176:#define 
extern_c2p_chars(cstr,
regs_to_protect, pterm) \
/home/dm/XSB/emu/cinterf.h:177:  c2p_chars(CTXTc 
cstr, regs_to_protect, pterm)
/home/dm/XSB/emu/cinterf.h:246:DllExport extern void 
call_conv
c2p_chars(CTXTdeclc char *str, int regs_to_protect, 
prolog_term term);
/home/dm/XSB/packages/libwww/cc/libwww_request.c:962:
c2p_chars(result_as_string, context->request_result);
/home/dm/XSB/packages/libwww/cc/libwww_parse_html.c:141:
c2p_chars(pcdata_buf.string+shift,
p2p_arg(STACK_TOP(htext).elt_term,3));
/home/dm/XSB/packages/libwww/cc/libwww_parse_xml.c:177:
c2p_chars(pcdata_buf.string+shift,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

which does seem to show that c2p_chars is defined to 
take 3 args,
but is only called with 2 in libwww.


----------------------------------------------------------------------

>Comment By: Michael Kifer (kifer)
Date: 2006-08-19 01:37

Message:
Logged In: YES 
user_id=12609

Yes, you are right. The number of args in c2p_chars has been
changed, but this wasn't propagated to libwww.

Regarding parsing RDF, there is no other tool in XSB at
present. But as I said, this tool needs to be brought
up-to-date.

----------------------------------------------------------------------

Comment By: Daniel Mahler (dmahler)
Date: 2006-08-18 11:06

Message:
Logged In: YES 
user_id=291320

Are threads enabled by default?
I just built it using

./configure --with-libwww=/usr
makexsb

Is there another tool in XSB to parse RDF to prolog facts?


----------------------------------------------------------------------

Comment By: Michael Kifer (kifer)
Date: 2006-08-18 10:10

Message:
Logged In: YES 
user_id=12609

Are you using the multithreaded engine of XSB?
The libwww interface hasn't been ported to work with this
engine.
Also, it has not been maintained actively for a few years,
so some things may not work.

----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=101176&aid=1542382&group_id=1176