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limit, usually due to infinite recursion, discard whatever remains
in all those open stack levels. Otherwise, insane constructions
like the following could generate macros of enormous size, causing
mandoc(1) to die from memory exhaustion:
.de m \" original macro definition
.m \" recursion to blow up the stack
.de m \" definition to be run during the call of .m marked (*)
very long plain text (some kilobytes)
.m \" expand the above a thousand times while unwinding the stack
.. \" end of the original definition
.m \" (*) recursively generate a ridiculously large macro
.. \" end of recursively generated definition
.m \" execute the giant macro, exhausting memory
Very creative abuse found by tb@ with afl(1).
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ugly in -Tascii output. For that reason, bentley@ submitted patches
to render "..." instead to groff in November 2014 (yes, more than
two years ago). Carsten Kunze yesterday merged them for the upcoming
groff-1.22.4 release. Yay!
Consequently, do the same in mandoc: Render \(Lq and \(Rq (which
are used for .Do, .Dq, .Lb, and .St) as '"' in -Tascii output.
All other output modes including -Tutf8 remain unchanged.
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Both kristaps@ and wiz@ repeated asked for this,
literally for years.
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Ingo Schwarze