fix merge

- Add null pointer check in XMLDocument::DeleteNode() method
- Add test case to verify null pointer handling
- Prevents segmentation fault when calling DeleteNode(nullptr)

readme.md

@@ -59,7 +59,7 @@ browsers or have more complete XML needs, TinyXML-2 is not the parser for you.
 TinyXML-1 vs. TinyXML-2
 -----------------------
 
-TinyXML-2 long been the focus of all development. It is well tested 
+TinyXML-2 has long been the focus of all development. It is well tested 
 and should be used instead of TinyXML-1.
 
 TinyXML-2 uses a similar API to TinyXML-1 and the same
@@ -145,7 +145,7 @@ It essentially causes the XML to be parsed twice.
 
 For applications that need to know about text nodes that are composed entirely of 
 whitespace, PEDANTIC_WHITESPACE is available. PEDANTIC_WHITESPACE maintains all the
-whilespace between elements. 
+whitespace between elements. 
 
 PEDANTIC_WHITESPACE is a new mode and not as tested as the other whitespace modes.
 
@@ -178,7 +178,7 @@ will have the Value() of "Far & Away" when queried from the XMLText object,
 and will be written back to the XML stream/file as an ampersand.
 
 Additionally, any character can be specified by its Unicode code point:
-The syntax ` ` or ` ` are both to the non-breaking space character.
+The syntax ` ` or ` ` both refer to the non-breaking space character.
 This is called a 'numeric character reference'. Any numeric character reference
 that isn't one of the special entities above, will be read, but written as a
 regular code point. The output is correct, but the entity syntax isn't preserved.
@@ -270,7 +270,7 @@ tinyxml2.h files in your project and build with your other source code.
 
 There is also a CMake build included. CMake is the general build for TinyXML-2.
 
-(Additional build systems are costly to maintain, and tend to bit-rot. They are
+(Additional build systems are costly to maintain, and tend to become outdated. They are
 being removed over time.)
 
 Building TinyXML-2 - Using vcpkg

tinyxml2.cpp

@@ -114,6 +114,9 @@ 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;
@@ -2344,9 +2347,11 @@ static FILE* callfopen( const char* filepath, const char* mode )
     return fp;
 }
 
-void XMLDocument::DeleteNode( XMLNode* node )	{
+void XMLDocument::DeleteNode( XMLNode* node )	{   
-    TIXMLASSERT( node );
+    if(node == 0) {
-    TIXMLASSERT(node->_document == this );
+        return; // check for null pointer
+    }
+    TIXMLASSERT(node->_document == this);
     if (node->_parent) {
         node->_parent->DeleteChild( node );
     }

xmltest.cpp

@@ -2025,7 +2025,13 @@ 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
 	{
 		XMLDocument doc(true, PEDANTIC_WHITESPACE);