Alternate format string checking: check if the number of format specifiers exceeds the number of arguments.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@94785 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Sema/SemaChecking.cpp

@@ -1418,6 +1418,18 @@ CheckPrintfHandler::HandleFormatSpecifier(const analyze_printf::FormatSpecifier
     return true;
   }
   
+  
+  // The remaining checks depend on the data arguments.
+  if (HasVAListArg)
+    return true;
+  
+  if (NumConversions > NumDataArgs) {
+    S.Diag(getLocationOfByte(CS.getStart()),
+           diag::warn_printf_insufficient_data_args)
+      << getFormatRange();    
+    // Don't do any more checking.
+    return false;
+  }
 
   return true;
 }