[rrd-developers] ROL and ROR for RPN

[Steve Shipway]

So, splitting this idea out from the separate post on the predict function,
I propose adding the new operations ROL and ROR to the RPN interpreter.

They would rotate the top 3 items left or right, and have this effect on the
stack ...

1,2,3,ROL  -->  2,3,1
1,2,3,ROR -->  3,1,2

These allow more complex arithmetic to be performed and complement the
existing EXC operator.

A context-diff against 1.4 is attached for your consideration; it is pretty
simple and implemented similarly to EXC.  The modified files are
rrd_rpncalc.h and rrd_rpncalc.c

Steve

Steve Shipway
s.shipway at auckland.ac.nz


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