Check invalid parameter

Change-Id: I17e6b7593210b7a4c4b0ef4d3491777af67a14f6

diff --git a/src/widget_app.c b/src/widget_app.c
index eff8ab3..1c3c855 100755 (executable)
--- a/src/widget_app.c
+++ b/src/widget_app.c
@@ -431,6 +431,9 @@ EXPORT_API int widget_app_terminate_context(widget_context_h context)
 
 EXPORT_API int widget_app_foreach_context(widget_context_cb cb, void *data)
 {
+       if (!cb)
+               return WIDGET_ERROR_INVALID_PARAMETER;
+
        return WIDGET_ERROR_NONE;
 }
 
@@ -439,18 +442,42 @@ EXPORT_API int widget_app_add_event_handler(app_event_handler_h *event_handler,
                                        void *user_data)
 {
        /* TODO */
-       return 0;
+       if (!event_handler || !callback)
+               return WIDGET_ERROR_INVALID_PARAMETER;
+
+       switch (event_type) {
+       case APP_EVENT_LOW_MEMORY:
+       case APP_EVENT_LOW_BATTERY:
+       case APP_EVENT_LANGUAGE_CHANGED:
+       case APP_EVENT_DEVICE_ORIENTATION_CHANGED:
+       case APP_EVENT_REGION_FORMAT_CHANGED:
+       case APP_EVENT_SUSPENDED_STATE_CHANGED:
+
+               break;
+       default:
+               return WIDGET_ERROR_INVALID_PARAMETER;
+       }
+
+       return WIDGET_ERROR_NONE;
 }
 
 EXPORT_API int widget_app_remove_event_handler(app_event_handler_h
                                                event_handler)
 {
        /* TODO */
-       return 0;
+       if (!event_handler)
+               return WIDGET_ERROR_INVALID_PARAMETER;
+
+       return WIDGET_ERROR_NONE;
 }
 
 EXPORT_API const char* widget_app_get_id(widget_context_h context)
 {
+       if (!context) {
+               set_last_result(WIDGET_ERROR_INVALID_PARAMETER);
+               return NULL;
+       }
+
        return context->id;
 }
 
@@ -574,8 +601,12 @@ EXPORT_API int widget_app_context_set_content_info(widget_context_h context, bun
 EXPORT_API int widget_app_context_set_title(widget_context_h context, const char *title)
 {
        /* TODO
-        may use widget status update, or use surface title set.
+        call elm_win_title_set()
         */
-       return 0;
+
+       if (!context || !title)
+               return WIDGET_ERROR_INVALID_PARAMETER;
+
+       return WIDGET_ERROR_NONE;
 }