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If you need to know if an option was set because of
presetting actions (RC/INI processing or environment variables),
versus a command line entry versus one of the SET/DISABLE macros,
then use this macro. It will yield one of four values:
OPTST_INIT, OPTST_SET, OPTST_PRESET
or OPTST_DEFINED. It is used thus:
switch (STATE_OPT( NAME )) {
case OPTST_INIT:
not-preset, set or on the command line. (unless CLEAR-ed)
case OPTST_SET:
option set via the SET_OPT_NAME() macro.
case OPTST_PRESET:
option set via an RC/INI file or environment variable
case OPTST_DEFINED:
option set via a command line option.
default:
cannot happen :)
}
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