Depending on the format type, different record fields are used
for output and input. The variable x stands for the
written or read value.
%f):%i):MASK==0 (because NOBT is not set):x=VALVAL=xMASK!=0:x=RVAL&MASKRVAL=x&MASKMASK is initialized to NOBT 1-bits shifted
left by SHFT.
%{):%s):
During initialization, the @init handler is executed, if
present. All format converters work like in normal operation.