new regression test for roff.c rev. 1.270:
infinite recursion in macro argument expansion

regression test for roff.c rev. 1.269:
recursive delayed expansion of escape sequences in macro arguments

Clean up messages related to plain text and to escape sequences.
* Mention invalid escape sequences and string names, and fallbacks.
* Hierarchical naming.

In quoted macro arguments, double quotes can be quoted by doubling them.
For a long time, we handle this in roff(7) and man(7) macros.
Now add correct handling for the mdoc(7) case, too.

Closely bas

In quoted macro arguments, double quotes can be quoted by doubling them.
For a long time, we handle this in roff(7) and man(7) macros.
Now add correct handling for the mdoc(7) case, too.

Closely based on a patch by Tsugutomo dot ENAMI at jp dot sony dot com,
see http://gnats.netbsd.org/cgi-bin/query-pr-single.pl?number=48438
received via Thomas Klausner (wiz@), slightly tweaked by me.

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Complete overhaul of the mandoc(1) test suite.
* Test the recently introduced -Tman output mode, too.
* Specify date and OS arguments in all tests.
* Remove the kludge of sed(1)ing away the page foot

Complete overhaul of the mandoc(1) test suite.
* Test the recently introduced -Tman output mode, too.
* Specify date and OS arguments in all tests.
* Remove the kludge of sed(1)ing away the page footer lines.
* New make(1) variables SKIP_TMAN, SKIP_GROFF.
* Drop obsolete, clumsy make(1) variable GROFF_TARGETS.
* Delete obsolete mdoc/Bl/E*.sh error reporting tests.
* Silence char/N/basic.
* New targets:
- ascii, ascii-clean - to run -Tascii tests only
- tman, tman-clean - to run the new -Tman tests only
- obj-clean - maintainer only, needed before groff-clean and groff
- groff-clean - maintainer only, affects checked-in files

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Unify roff macro argument parsing (in roff.c, roff_userdef()) and man macro
argument parsing (in man_argv.c, man_args()), both having different bugs,
to use one common macro argument parser (in mando

Unify roff macro argument parsing (in roff.c, roff_userdef()) and man macro
argument parsing (in man_argv.c, man_args()), both having different bugs,
to use one common macro argument parser (in mandoc.c, mandoc_getarg()),
because from the point of view of roff, man macros are just roff macros,
hence their arguments are parsed in exactly the same way.

While doing so, fix these bugs:
* Escaped blanks (i.e. those preceded by an odd number of backslashes)
were mishandled as argument separators in unquoted arguments to
user-defined roff macros.
* Unescaped blanks preceded by an even number of backslashes were not
recognized as argument separators in unquoted arguments to man macros.
* Escaped backslashes (i.e. pairs of backslashes) were not reduced
to single backslashes both in unquoted and quoted arguments both
to user-defined roff macros and to man macros.
* Escaped quotes (i.e. pairs of quotes inside quoted arguments) were
not reduced to single quotes in man macros.

OK kristaps@

Note that mdoc macro argument parsing is yet another beast for no good
reason and is probably afflicted by similar bugs. But i don't attempt
to fix that right now because it is intricately entangled with lots of
unrelated high-level mdoc(7) functionality, like delimiter handling and
column list phrase handling. Disentagling that would waste too much
time now.

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