WARNING: Argument 'buf' is not used in function-like macro
WARNING: Argument 'groupsize' is not used in function-like macro
WARNING: Argument 'hw' is not used in function-like macro
WARNING: Argument 'len' is not used in function-like macro
WARNING: Argument 'prefix' is not used in function-like macro
WARNING: Argument 'rowsize' is not used in function-like macro