Point Size II: Electric Boogaloo (.ps 0)

[G. Branden Robinson]

Or: Have You TRIED ".ps 0" Lately?

I'll bet you haven't.

CSTR #54 (1992) says:

.ps ±N    Point size set to ±N.  Alternatively embed \sN or ±N.  Any
          positive size value may be requested; if invalid, the next
          larger valid size will result, with a maximum of 36.

Does this imply that a zero value cannot be requested?

If it cannot be requested, does that make it "invalid"?  And if so,
should the "next larger valid size" result?

The groff Texinfo manual says:

     The size 0 (for both '.ps' and '\s'), or no argument (for '.ps'
     only), goes back to the previous size.

But check this out:

$ sed -n '/^void point_size/,/^}/p' src/roff/troff/env.cpp
void point_size()
{
  int n;
  if (has_arg() && get_number(&n, 'z', curenv->get_requested_point_size())) {
    if (n <= 0)          // <--------- ****** THIS RIGHT HERE ******
      n = 1;
    curenv->set_size(n);
  }
  else
    curenv->set_size(0);
  skip_line();
}

Checking "git blame" on the highlighted conditional, I find:

71e9155c3 troff/env.cc (James Clark 1993-03-03 13:14:51 -0500 1241)

So what do y'all wanna do?

Fix the documentation, or fix the test?

Regards,
Branden

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