/*
 * call-seq:
 *   attribute_nodes
 *
 * Get a list of attributes for this Node
 */
static VALUE attribute_nodes(VALUE self)
{
  xmlTextReaderPtr reader;
  VALUE attr ;

  Data_Get_Struct(self, xmlTextReader, reader);

  attr = rb_ary_new() ;

  if (! has_attributes(reader))
    return attr ;

  xmlNodePtr ptr = xmlTextReaderExpand(reader);
  if(ptr == NULL) return Qnil;

  VALUE enc = rb_iv_get(self, "@encoding");

  if(enc != Qnil && NULL == ptr->doc->encoding) {
    ptr->doc->encoding = calloc((size_t)RSTRING_LEN(enc), sizeof(char));
    strncpy(
      (char *)ptr->doc->encoding,
      StringValuePtr(enc),
      (size_t)RSTRING_LEN(enc)
    );
  }

  Nokogiri_xml_node_properties(ptr, attr);

  return attr ;
}