remove nullptr error code from params with mbz trait (#52)

Signed-off-by: Brandon Yates <brandon.yates@intel.com>

scripts/parse_specs.py

@@ -684,7 +684,7 @@ def _append(lst, key, val):
             if not param_traits.is_optional(item):
                 typename = type_traits.base(item['type'])
 
-                if type_traits.is_pointer(item['type']):
+                if type_traits.is_pointer(item['type']) and not param_traits.is_mbz(item):
                     _append(rets, "$X_RESULT_ERROR_INVALID_NULL_POINTER", "`nullptr == %s`"%item['name'])
 
                 elif type_traits.is_handle(item['type']) and not type_traits.is_ipc_handle(item['type']):

scripts/templates/helper.py

@@ -294,13 +294,21 @@ def find_enum_name(cls, name, meta):
     Extracts traits from a parameter object
 """
 class param_traits:
+    RE_MBZ      = r".*\[mbz\].*"
     RE_IN       = r"^\[in\].*"
     RE_OUT      = r"^\[out\].*"
     RE_INOUT    = r"^\[in,out\].*"
     RE_OPTIONAL = r".*\[optional\].*"
     RE_RANGE    = r".*\[range\((.+),\s*(.+)\)\][\S\s]*"
     RE_RELEASE  = r".*\[release\].*"
 
+    @classmethod
+    def is_mbz(cls, item):
+        try:
+            return True if re.match(cls.RE_MBZ, item['desc']) else False
+        except:
+            return False
+
     @classmethod
     def is_input(cls, item):
         try: