core: add more status codes

core/include/blue/core/status.h

@@ -18,6 +18,9 @@ typedef enum b_status {
 	B_ERR_NO_DATA,
 	B_ERR_UNKNOWN_FUNCTION,
 	B_ERR_BAD_FORMAT,
+	B_ERR_IO_FAILURE,
+	B_ERR_IS_DIRECTORY,
+	B_ERR_NOT_DIRECTORY,
 } b_status;
 
 BLUE_API const char *b_status_to_string(b_status status);