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

[Cyril P. <cyr...@la...>]

Jonathan Wakely wrote:
> On Mon, Jan 10, 2005 at 10:27:09PM +0100, Cyril PICARD wrote:
>=20
>=20
>>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=20
>>receive a SIGABRT signal.
>>
>>Any idea around ?
>>
>>Thanks
>=20
>=20
> I'll have a guess ...
>=20
>=20
>>* gdb info st :
>>
>>#0  0x403aa621 in kill () from /lib/libc.so.6
>>#1  0x4017826b in raise (sig=3D6) at signals.c:65
>>#2  0x403aba53 in abort () from /lib/libc.so.6
>>#3  0x402f7895 in __cxxabiv1::__terminate(void (*)()) () from=20
>>/usr/lib/libstdc++.so.3
>>#4  0x402f7880 in __cxxabiv1::__terminate(void (*)()) () from=20
>>/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=20
>>/usr/lib/libstdc++.so.3
>>#7  0x0804aef1 in std::string::_Rep::_S_create(unsigned,=20
>>std::allocator<char> const&) (__capacity=3D4294967295,
>>    __alloc=3D@0xbffff500) at /usr/include/g++-v3/bits/basic_string.tcc=
:371
>>#8  0x0804ab28 in char* std::string::_S_construct<char const*>(char=20
>>const*, char const*, std::allocator<char> const&,=20
>>std::forward_iterator_tag) (
>>    __beg=3D0x80516e0 "<?xml version=3D\"1.0\"=20
>>encoding=3D\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM=20
>>\"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS=20
>>project-->\n<GEDCOM>blah ?</GEDCOM>\n", __end=3D0x80516df "",
>>    __a=3D@0xbffff500) at /usr/include/g++-v3/bits/basic_string.tcc:143
>=20
>=20
> The frame above has __end < __beg, which is why an exception is thrown.
>=20
>=20
>>#9  0x40034674 in std::string::string(char const*, unsigned,=20
>>std::allocator<char> const&) (this=3D0xbffff560,
>>    __s=3D0x80516e0 "<?xml version=3D\"1.0\"=20
>>encoding=3D\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM=20
>>\"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS=20
>>project-->\n<GEDCOM>blah ?</GEDCOM>\n", __n=3D4294967295,
>>    __a=3D@0xbffff500) at /usr/include/g++-v3/bits/basic_string.h:666
>=20
>=20
> That seems to be because __n =3D std::string::npos =3D size_t(-1) in fr=
ame #9,
> which must be passed by:
>=20
>=20
>>#10 0x401c40c4 in Glib::ustring::ustring(char const*, unsigned)=20
>>(this=3D0xbffff560,
>>    src=3D0x80516e0 "<?xml version=3D\"1.0\"=20
>>encoding=3D\"ISO-8859-1\"?>\n<!DOCTYPE GEDCOM SYSTEM=20
>>\"gedcom60.dtd\">\n<!--Generated by libgedcomparser - part of GHOSTS=20
>>project-->\n<GEDCOM>blah ?</GEDCOM>\n", n=3D169)
>>    at /usr/include/g++-v3/bits/stl_alloc.h:571
>=20
>=20
> n =3D 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 '=EF=BF=BD' wasn't converted from latin1 to ut=
f-8.
>=20
>=20
>>#11 0x40025d27 in xmlpp::Document::do_write_to_string(Glib::ustring=20
>>const&, bool) (this=3D0xbffff6a0,
>>    encoding=3D@0xbffff5d0, format=3Dtrue) at document.cc:309
>=20
>=20
> jon
>=20

Thanks jon

I understand your comments, but I don't understand how to correctly=20
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=20
Document::write_to_file_formatted