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for example used by groff_hdtbl(7) and groff_mom(7).
Also correctly interpolate arguments during nested macro execution
even after .shift and .return, implemented using a stack of argument
arrays.
Note that only read.c, but not roff.c can detect the end of a macro
execution, and the existence of .shift implies that arguments cannot
be interpolated up front, so unfortunately, this includes a partial
revert of roff.c rev. 1.337, moving argument interpolation back into
the function roff_res().
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causes horrible churn anyway, profit of the opportunity to stop
excessive testing, such that this is hopefully the last instance
of such churn. Consistently use OpenBSD RCS tags, blank .Os,
blank fourth .TH argument, and Mdocdate like everywhere else.
Use -Ios=OpenBSD for platform-independent predictable output.
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of a user-defined macro; issue found by tb@ with afl(1)
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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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Ingo Schwarze