boost::property_tree::write_xml_element does not encode character before writing to attribute value

[Alex K Yau <alex.yau@…>]

The character in attribute value is not encoded in entity names and may output a quote " to attribute value which escapes the attribute value and thus outputs a wrong value.

if the attribute stored in attribs is ("mystring", "\"") under node x. The expected output string is <x mystring="&quot;"/> instead of <x mystring="""/>. The value is &quot;, but not null string and the quote in the tag should be balanced.

This can resolve by changing "boost/property_tree/detail/xml_parser_write.hpp" Line 118 to 119 from

stream << Ch(' ') << it->first << Ch('=') << 
          Ch('"') << it->second.template get_value<std::basic_string<Ch> >() << Ch('"');

to

stream << Ch(' ') << it->first << Ch('=') << 
          Ch('"') << encode_char_entities(it->second.template get_value<std::basic_string<Ch> >()) << Ch('"');

[Alex K Yau <alex.yau@…>]

Sorry the bug has been fixed in v1.55.0. Sorry about a false alarm. The bug was found originally in v1.46.1.