[bug #63587] [troff] set .R register to maximum representable integer

[Dave]

Follow-up Comment #9, bug #63587 (project groff):

[comment #8 comment #8:]
> the possible existence of there being other ways to trip over
> what appears to be deficient integer overflow handling.
> 
> I'm less concerned with complexity here than with there being an
> access hatch from the roff language to undefined behavior in C/C++.

Makes sense.

> Also I will admit that Heirloom returning a correct INT_MAX for
> \n[.t] in a diversion while we don't chaps me a little.  ;-)

If it's any consolation, I think groff still wins in terms of overall correct
behavior, and certainly in terms of developer responsiveness to bugs.  Not
that it's a competition ;-)


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