Added object-name c-string getter function to basic objects so they can be referenced to free if dynamically created. (#754)

* Added basic object-name get for ASCII names to enable free if they were dynamically created. Added unit testing to validate the basic object ASCII object-name API.

* Removed static scope on character array used for name since the array gets copied into characterstring array and static is not needed.

src/bacnet/basic/object/bacfile.c

@@ -33,7 +33,7 @@
 #define FILE_RECORD_SIZE MAX_OCTET_STRING_BYTES
 #endif
 struct object_data {
-    char *Object_Name;
+    const char *Object_Name;
     char *Pathname;
     BACNET_DATE_TIME Modification_Date;
     char *File_Type;
@@ -206,7 +206,7 @@ bool bacfile_object_name_set(uint32_t object_instance, char *new_name)
     struct object_data *pObject;
 
     pObject = Keylist_Data(Object_List, object_instance);
-    if (pObject && new_name) {
+    if (pObject) {
         status = true;
         pObject->Object_Name = new_name;
     }
@@ -214,6 +214,25 @@ bool bacfile_object_name_set(uint32_t object_instance, char *new_name)
     return status;
 }
 
+/**
+ * @brief Return the object name C string
+ * @param object_instance [in] BACnet object instance number
+ * @return object name or NULL if not found
+ */
+const char *bacfile_name_ansi(uint32_t object_instance)
+{
+    const char *name = NULL;
+    struct object_data *pObject;
+
+    pObject = Keylist_Data(Object_List, object_instance);
+    if (pObject) {
+        name = pObject->Object_Name;
+    }
+
+    return name;
+}
+
+
 /**
  * @brief Determines if a given object instance is valid
  * @param  object_instance - object-instance number of the object