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With roff_getstrn(), provide finer control which definitions
can be used for what:
* All definitions can be used for .if d tests and .am appending.
* User-defined for \* expansion, .dei expansion, and macro calling.
* Predefined for \* expansion.
* Standard macros, original or renamed, for macro calling.
Several related improvements while here:
* Do not return string table entries that have explicitly been removed.
* Do not create a rentab entry when trying to rename a non-existent macro.
* Clear an existing rentab entry when the external interface
roff_setstr() is called with its name.
* Avoid trailing blanks in macro lines generated from renamed
and from aliased macros.
* Delete the duplicate __m*_reserved[] tables, just use roff_name[].
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and operating system dependent messages about missing or unexpected
Mdocdate; inspired by mdoclint(1).
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Generate the first node on the roff level: .br
Fix some column numbers in diagnostic messages while here.
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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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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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