Hi,

Enclosed are my efforts to unify the escaped-sequence functions in out.c 
(a2roffdeco()) and mandoc.c (mandoc_special()).

This handles, as far as I can see, all syntaxes of the groff(7) escapes.

When called during libmandoc validation, it will check for GLYPH_ERROR 
and be followed by a search-and-replace of ASCII_HYPH for `-' in the 
substring.  When invoked from term.c or html.c, it will switch on the 
returned type and substring value.

This will clear up a nice big chunk of code, but it's a pretty delicate 
area, so please look it over!

If you compile this file, you can test escapes by running, e.g.,

   % ./a.out s+\'\(\\f\[asdf\]\)\'123

to see the values of "start" and "end".

Thanks,

Kristaps