[bug #64505] [troff] `fzoom` should not accept a mounting position or abstract font name as argument

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?64505>

                 Summary: [troff] `fzoom` should not accept a mounting
position or abstract font name as argument
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Wed 02 Aug 2023 03:20:27 PM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: Confirmed
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Wed 02 Aug 2023 03:20:27 PM UTC By: G. Branden Robinson <gbranden>
The formatter behaves unpredictably and weirdly if `fzoom` is given a mounting
position or abstract font name as its first argument.


$ cat EXPERIMENTS/fzoom-position.groff.fam T
.fzoom 1 500 \" or s/1/R/
Times,
.fam H
.fzoom HR 900
Helvetica,
.fam P
.fzoom PR 1200
Palatino,
.fzoom CR 1100
and \f[CR]Courier\f[].
.fam T
Times again.
.br
\F[T]FONT
\F[H]FONT
\F[P]FONT
\F[C]FONT


Take out the first line to observe well-behaved formatting.

The request should reject such attempts with an error diagnostic, and do
nothing.








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