Re: Determining *DS4 support

["Sims, Ken" <KSIMS@xxxxxxxxxxxxxxxx>]

Hi Paul -

>FWIW, in RPG IV this can be changed to eliminate the work variable and
>indicator like so:
>
> C         if        (%subst(devCap : 2 : 1) and x'30') = x'30'
>
>Better still would be to define a symbolic constant:
>
> C         if        (%subst(devCap : 2 : 1) and DS4) = DS4
>
>Ideally, it should be possible to just use
>
> C         if        %subst(devCap : 2 : 1) and DS4
>
>but I don't think this behaviour is guaranteed to work.

Unfortunately, none of the above statements will work.  'and' is a logical
operator, not a bit operator.  It returns true ('1') if both operands are
true, otherwise it returns false ('0').

To avoid using TESTB, which requires indicators, I would move the byte in
question to a one-byte character work field; use BITOF to set off all of the
bits that I don't care about; then compare that value to the appropriate hex
constants or named constants defined with the appropriate hex values.

Ken
Southern Wine and Spirits of Nevada, Inc.
Opinions expressed are my own and do not necessarily represent the views of
my employer or anyone in their right mind.

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