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

diff --git a/tinyxml2.h b/tinyxml2.h
index ecab407..c9850f6 100755
--- a/tinyxml2.h
+++ b/tinyxml2.h
@@ -1634,6 +1634,13 @@
 class TINYXML2_LIB XMLDocument : public XMLNode

 {

     friend class XMLElement;

+    // Gives access to SetError, but over-access for everything else.

+    // Wishing C++ had "internal" scope.

+    friend class XMLNode;       

+    friend class XMLText;

+    friend class XMLComment;

+    friend class XMLDeclaration;

+    friend class XMLUnknown;

 public:

     /// constructor

     XMLDocument( bool processEntities = true, Whitespace whitespaceMode = PRESERVE_WHITESPACE );

@@ -1785,8 +1792,6 @@
     */

     void DeleteNode( XMLNode* node );

 

-    void SetError( XMLError error, int lineNum, const char* format, ... );

-

     void ClearError() {

         SetError(XML_SUCCESS, 0, 0);

     }

@@ -1802,16 +1807,19 @@
 	const char* ErrorName() const;

     static const char* ErrorIDToName(XMLError errorID);

 

-    /// Return a possibly helpful diagnostic location or string.

-	const char* GetErrorStr() const;

+    /** Returns a "long form" error description. A hopefully helpful 

+        diagnostic with location, line number, and/or additional info.

+    */

+	const char* ErrorStr() const;

+

+    /// A (trivial) utility function that prints the ErrorStr() to stdout.

+    void PrintError() const;

 

     /// Return the line where the error occured, or zero if unknown.

-    int GetErrorLineNum() const

+    int ErrorLineNum() const

     {

         return _errorLineNum;

     }

-    /// If there is an error, print it to stdout.

-    void PrintError() const;

     

     /// Clear the document, resetting it to the initial state.

     void Clear();

@@ -1867,6 +1875,8 @@
 

     void Parse();

 

+    void SetError( XMLError error, int lineNum, const char* format, ... );

+

     template<class NodeType, int PoolElementSize>

     NodeType* CreateUnlinkedNode( MemPoolT<PoolElementSize>& pool );

 };

diff --git a/xmltest.cpp b/xmltest.cpp
index 01b5011..a297722 100644
--- a/xmltest.cpp
+++ b/xmltest.cpp
@@ -499,13 +499,9 @@
 		int value2 = doc->FirstChildElement()->LastChildElement()->IntAttribute( "attrib", replacementIntValue );

 		XMLError result = doc->FirstChildElement()->LastChildElement()->QueryIntAttribute( "attrib", &value1 );

 		XMLTest( "Programmatic DOM", XML_NO_ATTRIBUTE, result );

-		doc->PrintError();

 		XMLTest( "Programmatic DOM", defaultIntValue, value1 );

 		XMLTest( "Programmatic DOM", replacementIntValue, value2 );

 

-

-		exit(0);

-

 		doc->Print();

 

 		{

@@ -1958,11 +1954,9 @@
 		XMLDocument doc;

 		for( int i = 0; i < XML_ERROR_COUNT; i++ ) {

 			const XMLError error = static_cast<XMLError>(i);

-			doc.SetError( error, 0, 0, 0 );

-			XMLTest( "ErrorID() after SetError()", error, doc.ErrorID() );

-			const char* name = doc.ErrorName();

-			XMLTest( "ErrorName() after SetError()", true, name != 0 );

-			XMLTest( "ErrorName() after SetError()", true, strlen(name) > 0 );

+			const char* name = XMLDocument::ErrorIDToName(error);

+			XMLTest( "ErrorName() after ClearError()", true, name != 0 );

+			XMLTest( "ErrorName() after ClearError()", true, strlen(name) > 0 );

 		}

 	}

 

@@ -2060,7 +2054,7 @@
                 XMLTest(testString, parseError, doc.ErrorID());

                 XMLTest(testString, true, doc.Error());

                 XMLTest(testString, expected_error, parseError);

-                XMLTest(testString, expectedLine, doc.GetErrorLineNum());

+                XMLTest(testString, expectedLine, doc.ErrorLineNum());

             };

 

             void TestStringLines(const char *testString, const char *docStr, const char *expectedLines)

@@ -2178,6 +2172,18 @@
             "D01L01E02E03A03A03T03E04A04A04T04E05A05A05T05E06A06A06T06E07A07A07T07E08A08A08T08E09T09E10T10");

     }

 

+    {

+    	const char* xml = "<Hello>Text</Error>";

+    	XMLDocument doc;

+    	doc.Parse(xml);

+    	XMLTest("Test mismatched elements.", true, doc.Error());

+    	XMLTest("Test mismatched elements.", XML_ERROR_MISMATCHED_ELEMENT, doc.ErrorID());

+    	// For now just make sure calls work & doesn't crash.

+    	// May solidify the error output in the future.

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

+    	doc.PrintError();

+    }

+

     // ----------- Performance tracking --------------

 	{

 #if defined( _MSC_VER )