duplicate a variable!!!!

[VAUGHAN Jay]

> That would be my question too. I know a little (but not much) about
> hardening code, and I am aware of some of the issues if there can be
> unexpected outside influences on your program (such as radiation or
> hardware issues causing changes to memory locations). I can't see any
> way in which some sort of general duplication of variables would help.


The 'proper' way to do it is with C macro's that can be used to declare, increment, and 
decrement, values in a redundnat structure containing both the inverted value as well as 
non-inverted value, a macro for setting the value (which also sets the inverted value), 
and a macro (and error handling) for checking the value and ensuring that it is the 
inverse of the inverted-values before it is used ..

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Jay Vaughan,                                Scheydgasse 41
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