minor readme fixes

tinyxml2.cpp

@@ -114,9 +114,6 @@ distribution.
 	#define TIXML_VSNPRINTF	vsnprintf
 	static inline int TIXML_VSCPRINTF( const char* format, va_list va )
 	{
-	    if (!format) {
-	        return 0;
-	    }
 		int len = vsnprintf( 0, 0, format, va );
 		TIXMLASSERT( len >= 0 );
 		return len;
@@ -834,17 +831,7 @@ XMLNode::XMLNode( XMLDocument* doc ) :
 
 XMLNode::~XMLNode()
 {
-    // Fast path: this node is dying, so maintaining _firstChild/_lastChild and
+    DeleteChildren();
-    // sibling _prev/_next links is unnecessary. Only _parent must be zeroed to
-    // satisfy the MarkInUse assertion inside DeleteNode.
-    XMLNode *currentChild = _firstChild;
-    while (currentChild != NULL) {
-        XMLNode *next = currentChild->_next;
-        currentChild->_parent = 0;
-        DeleteNode(currentChild);
-        currentChild = next;
-    }
-
     if ( _parent ) {
         _parent->Unlink( this );
     }
@@ -2358,9 +2345,8 @@ static FILE* callfopen( const char* filepath, const char* mode )
 }
 
 void XMLDocument::DeleteNode( XMLNode* node )	{
-    if(node == 0) {
+    TIXMLASSERT( node );
-        return; // check for null pointer
+    TIXMLASSERT(node->_document == this );
-    }
     if (node->_parent) {
         node->_parent->DeleteChild( node );
     }

tinyxml2.h

@@ -42,6 +42,14 @@ distribution.
 #endif
 #include <stdint.h>
 
+/*
+	gcc:
+        g++ -Wall -DTINYXML2_DEBUG tinyxml2.cpp xmltest.cpp -o gccxmltest.exe
+
+    Formatting, Artistic Style:
+        AStyle.exe --style=1tbs --indent-switches --break-closing-brackets --indent-preprocessor tinyxml2.cpp tinyxml2.h
+*/
+
 #if defined( _DEBUG ) || defined (__DEBUG__)
 #   ifndef TINYXML2_DEBUG
 #       define TINYXML2_DEBUG

xmltest.cpp

@@ -2025,12 +2025,6 @@ int main( int argc, const char ** argv )
 		XMLTest("Parse nested elements with pedantic whitespace", false, doc.Error());
 		XMLTest("Pedantic whitespace", true, 0 == doc.RootElement()->FirstChildElement()->GetText());
 	}
-	//Check the robustness of the DeleteNode function in handling null pointers.
-	{
-		XMLDocument doc;
-		doc.DeleteNode(nullptr);
-		XMLTest("DeleteNode with null pointer", true, doc.Error() == XML_SUCCESS);
-	}
 
 	// Check sample xml can be parsed with pedantic mode
 	{