[bug #68375] [troff] have callers of `read_{h, v}units()` check for garbage after numeric expression

URL:
  <https://savannah.gnu.org/bugs/?68375>

                 Summary: [troff] have callers of `read_{h,v}units()` check
for garbage after numeric expression
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Wed 20 May 2026 02:50:23 PM UTC
                Category: Core
                Severity: 1 - Wish
              Item Group: Warning/Suspicious behaviour
                  Status: None
                 Privacy: Public
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Unlocked
         Planned Release: None


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Follow-up Comments:


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Date: Wed 20 May 2026 02:50:23 PM UTC By: G. Branden Robinson <gbranden>
Presently, they don't.

`read_{h,v}units()` themselves cannot reliably do this because sometimes they
are called where the input stream is in a delimited context and sometimes when
it is not.  A input character is that is garbage immediately after a numeric
expression is not garbage, but expected, if it is a delimiter-eligible
character matching an opening delimiter.

The callers have the appropriate context, so the callers must check.







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