Re: [libxml++] SIGABRT received during xmlpp::Document::write_to_string_formatted

[Cyril PICARD <cyril picard-mail laposte net>]

Jonathan Wakely wrote:
> On Mon, Jan 10, 2005 at 10:27:09PM +0100, Cyril PICARD wrote:
>
>
> > Hi
> >
> > I'm writing an XML file with the xmlpp interface.
> > Everything is fine with xmlpp::Document::write_to_file_formatted();
> > But when I'm calling xmlpp::Document::write_to_string_formatted(), I 
> > receive a SIGABRT signal.
> >
> > Any idea around ?
> >
> > Thanks
>
>
> I'll have a guess ...
>
>
> > * gdb info st :
> >
> > #0  0x403aa621 in kill () from /lib/libc.so.6
> > #1  0x4017826b in raise (sig=6) at signals.c:65
> > #2  0x403aba53 in abort () from /lib/libc.so.6
> > #3  0x402f7895 in __cxxabiv1::__terminate(void (*)()) () from 
> > /usr/lib/libstdc++.so.3
> > #4  0x402f7880 in __cxxabiv1::__terminate(void (*)()) () from 
> > /usr/lib/libstdc++.so.3
> > #5  0x402f79e0 in __cxa_rethrow () from /usr/lib/libstdc++.so.3
> > #6  0x402ede29 in std::__throw_length_error(char const*) () from 
> > /usr/lib/libstdc++.so.3
> > #7  0x0804aef1 in std::string::_Rep::_S_create(unsigned, 
> > std::allocator<char> const&) (__capacity=4294967295,
> >    __alloc= 0xbffff500) at /usr/include/g++-v3/bits/basic_string.tcc:371
> > #8  0x0804ab28 in char* std::string::_S_construct<char const*>(char 
> > const*, char const*, std::allocator<char> const&, 
> > std::forward_iterator_tag) (
> >    __beg=0x80516e0 "<?xml version=\"1.0\" 
> > encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM 
> > \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS 
> > project-->\n<GEDCOM>blah ?</GEDCOM>\n", __end=0x80516df "",
> >    __a= 0xbffff500) at /usr/include/g++-v3/bits/basic_string.tcc:143
>
>
> The frame above has __end < __beg, which is why an exception is thrown.
>
>
> > #9  0x40034674 in std::string::string(char const*, unsigned, 
> > std::allocator<char> const&) (this=0xbffff560,
> >    __s=0x80516e0 "<?xml version=\"1.0\" 
> > encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM 
> > \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS 
> > project-->\n<GEDCOM>blah ?</GEDCOM>\n", __n=4294967295,
> >    __a= 0xbffff500) at /usr/include/g++-v3/bits/basic_string.h:666
>
>
> That seems to be because __n = std::string::npos = size_t(-1) in frame #9,
> which must be passed by:
>
>
> > #10 0x401c40c4 in Glib::ustring::ustring(char const*, unsigned) 
> > (this=0xbffff560,
> >    src=0x80516e0 "<?xml version=\"1.0\" 
> > encoding=\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM 
> > \"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS 
> > project-->\n<GEDCOM>blah ?</GEDCOM>\n", n=169)
> >    at /usr/include/g++-v3/bits/stl_alloc.h:571
>
>
> n = 169 in that frame, but Glib::ustring seems to pass -1 to the
> std::string ctor. That looks as though utf8_byte_offset(src,n) returns
> -1, which I think means there was an invalid UTF8 character in the
> string. Is the data you pass to the string correctly UTF8-encoded?
> The gdb output shows the '�' wasn't converted from latin1 to utf-8.
>
>
> > #11 0x40025d27 in xmlpp::Document::do_write_to_string(Glib::ustring 
> > const&, bool) (this=0xbffff6a0,
> >    encoding= 0xbffff5d0, format=true) at document.cc:309
>
>
> jon

Thanks jon

I understand your comments, but I don't understand how to correctly 
UTF-8-encode my string. I thought my conversion was ok since
- I use the ConvertInput function provided in the libxml2 code samples
- I successfully write the xml data into a file using 
Document::write_to_file_formatted