msxml3: Don't return NULL namespace and local name in saxreader callbacks.

dlls/msxml3/saxreader.c

@@ -149,6 +149,8 @@ static saxreader_feature get_saxreader_feature(const WCHAR *name)
     return FeatureUnknown;
 }
 
+static const WCHAR empty_str;
+
 struct bstrpool
 {
     BSTR *pool;
@@ -1665,8 +1667,8 @@ static void libxmlStartElementNS(
                     &uri, &local, &element->qname, &This->IVBSAXAttributes_iface);
         else
             hr = ISAXContentHandler_startElement(handler->handler,
-                    uri, SysStringLen(uri),
-                    local, SysStringLen(local),
+                    uri ? uri : &empty_str, SysStringLen(uri),
+                    local ? local : &empty_str, SysStringLen(local),
                     element->qname, SysStringLen(element->qname),
                     &This->ISAXAttributes_iface);
 
@@ -1739,8 +1741,8 @@ static void libxmlEndElementNS(
     else
         hr = ISAXContentHandler_endElement(
                 handler->handler,
-                uri, SysStringLen(uri),
-                local, SysStringLen(local),
+                uri ? uri : &empty_str, SysStringLen(uri),
+                local ? local : &empty_str, SysStringLen(local),
                 element->qname, SysStringLen(element->qname));
 
     free_attribute_values(This);

dlls/msxml3/tests/saxreader.c

@@ -1162,6 +1162,9 @@ static HRESULT WINAPI contentHandler_startPrefixMapping(
 {
     struct call_entry call;
 
+    ok(prefix != NULL, "prefix == NULL\n");
+    ok(uri != NULL, "uri == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_STARTPREFIXMAPPING;
     call.arg1W = SysAllocStringLen(prefix, prefix_len);
@@ -1177,6 +1180,8 @@ static HRESULT WINAPI contentHandler_endPrefixMapping(
 {
     struct call_entry call;
 
+    ok(prefix != NULL, "prefix == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_ENDPREFIXMAPPING;
     call.arg1W = SysAllocStringLen(prefix, len);
@@ -1197,6 +1202,10 @@ static HRESULT WINAPI contentHandler_startElement(
     HRESULT hr;
     int len;
 
+    ok(uri != NULL, "uri == NULL\n");
+    ok(localname != NULL, "localname == NULL\n");
+    ok(qname != NULL, "qname == NULL\n");
+
     hr = ISAXAttributes_QueryInterface(saxattr, &IID_IMXAttributes, (void**)&mxattr);
     EXPECT_HR(hr, E_NOINTERFACE);
 
@@ -1272,6 +1281,10 @@ static HRESULT WINAPI contentHandler_endElement(
 {
     struct call_entry call;
 
+    ok(uri != NULL, "uri == NULL\n");
+    ok(localname != NULL, "localname == NULL\n");
+    ok(qname != NULL, "qname == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_ENDELEMENT;
     call.arg1W = SysAllocStringLen(uri, uri_len);
@@ -1289,6 +1302,8 @@ static HRESULT WINAPI contentHandler_characters(
 {
     struct call_entry call;
 
+    ok(chars != NULL, "chars == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_CHARACTERS;
     call.arg1W = SysAllocStringLen(chars, len);
@@ -1303,6 +1318,8 @@ static HRESULT WINAPI contentHandler_ignorableWhitespace(
 {
     struct call_entry call;
 
+    ok(chars != NULL, "chars == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_IGNORABLEWHITESPACE;
     call.arg1W = SysAllocStringLen(chars, len);
@@ -1318,6 +1335,9 @@ static HRESULT WINAPI contentHandler_processingInstruction(
 {
     struct call_entry call;
 
+    ok(target != NULL, "target == NULL\n");
+    ok(data != NULL, "data == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_PROCESSINGINSTRUCTION;
     call.arg1W = SysAllocStringLen(target, target_len);
@@ -1333,6 +1353,8 @@ static HRESULT WINAPI contentHandler_skippedEntity(
 {
     struct call_entry call;
 
+    ok(name != NULL, "name == NULL\n");
+
     init_call_entry(locator, &call);
     call.id = CH_SKIPPEDENTITY;
     call.arg1W = SysAllocStringLen(name, len);