fix up error system issues
diff --git a/tinyxml2.cpp b/tinyxml2.cpp
index 140df86..3ec4f6d 100755
--- a/tinyxml2.cpp
+++ b/tinyxml2.cpp
@@ -1039,7 +1039,7 @@
                 }

             }

             if ( !wellLocated ) {

-                _document->SetError( XML_ERROR_PARSING_DECLARATION, initialLineNum, "value: %s", decl->Value());

+                _document->SetError( XML_ERROR_PARSING_DECLARATION, initialLineNum, "XMLDeclaration value=%s", decl->Value());

                 DeleteNode( node );

                 break;

             }

@@ -1074,7 +1074,7 @@
                 }

             }

             if ( mismatch ) {

-                _document->SetError( XML_ERROR_MISMATCHED_ELEMENT, initialLineNum, "name=%s", ele->Name());

+                _document->SetError( XML_ERROR_MISMATCHED_ELEMENT, initialLineNum, "XMLElement name=%s", ele->Name());

                 DeleteNode( node );

                 break;

             }

@@ -1811,7 +1811,7 @@
     while( p ) {

         p = XMLUtil::SkipWhiteSpace( p, curLineNumPtr );

         if ( !(*p) ) {

-            _document->SetError( XML_ERROR_PARSING_ELEMENT, _parseLineNum, "element name=%s", Name() );

+            _document->SetError( XML_ERROR_PARSING_ELEMENT, _parseLineNum, "XMLElement name=%s", Name() );

             return 0;

         }

 

@@ -1826,7 +1826,7 @@
             p = attrib->ParseDeep( p, _document->ProcessEntities(), curLineNumPtr );

             if ( !p || Attribute( attrib->Name() ) ) {

                 DeleteAttribute( attrib );

-                _document->SetError( XML_ERROR_PARSING_ATTRIBUTE, attrLineNum, "element name=%s", Name() );

+                _document->SetError( XML_ERROR_PARSING_ATTRIBUTE, attrLineNum, "XMLElement name=%s", Name() );

                 return 0;

             }

             // There is a minor bug here: if the attribute in the source xml

@@ -2153,7 +2153,7 @@
     Clear();

     FILE* fp = callfopen( filename, "rb" );

     if ( !fp ) {

-        SetError( XML_ERROR_FILE_NOT_FOUND, 0, "filename=%s", filename );

+        SetError( XML_ERROR_FILE_NOT_FOUND, 0, "filename=%s", filename ? filename : "<null>");

         return _errorID;

     }

     LoadFile( fp );

@@ -2234,7 +2234,7 @@
 {

     FILE* fp = callfopen( filename, "w" );

     if ( !fp ) {

-        SetError( XML_ERROR_FILE_COULD_NOT_BE_OPENED, 0, "filename=%s", filename );

+        SetError( XML_ERROR_FILE_COULD_NOT_BE_OPENED, 0, "filename=%s", filename ? filename : "<null>");

         return _errorID;

     }

     SaveFile(fp, compact);

@@ -2307,7 +2307,7 @@
     if (format) {

         size_t BUFFER_SIZE = 1000;

         char* buffer = new char[BUFFER_SIZE];

-        TIXML_SNPRINTF(buffer, BUFFER_SIZE, "Error=%s ErrorID=%d line=%d ", ErrorIDToName(error), int(error), lineNum);

+        TIXML_SNPRINTF(buffer, BUFFER_SIZE, "Error=%s ErrorID=%d (0x%x) Line number=%d: ", ErrorIDToName(error), int(error), int(error), lineNum);

         size_t len = strlen(buffer);

 

         va_list va;

@@ -2329,34 +2329,22 @@
     return errorName;

 }

 

-const char* XMLDocument::GetErrorStr() const 

+const char* XMLDocument::ErrorStr() const 

 {

 	return _errorStr.Empty() ? "" : _errorStr.GetStr();

 }

 

+

+void XMLDocument::PrintError() const

+{

+    printf("%s\n", ErrorStr());

+}

+

 const char* XMLDocument::ErrorName() const

 {

     return ErrorIDToName(_errorID);

 }

 

-void XMLDocument::PrintError() const

-{

-    if ( Error() ) {

-        static const int LEN = 20;

-        char buf1[LEN] = { 0 };

-        char buf2[LEN] = { 0 };

-

-        if ( !_errorStr.Empty() ) {

-            TIXML_SNPRINTF( buf1, LEN, "%s", _errorStr.GetStr() );

-        }

-        // Should check INT_MIN <= _errorID && _errorId <= INT_MAX, but that

-        // causes a clang "always true" -Wtautological-constant-out-of-range-compare warning

-        TIXMLASSERT( 0 <= _errorID && XML_ERROR_COUNT - 1 <= INT_MAX );

-        printf( "XMLDocument error id=%d '%s' str1=%s str2=%s line=%d\n",

-                static_cast<int>( _errorID ), ErrorName(), buf1, buf2, _errorLineNum );

-    }

-}

-

 void XMLDocument::Parse()

 {

     TIXMLASSERT( NoChildren() ); // Clear() must have been called previously