[bug #66009] [troff] accepts `|` as operand delimiter, but should not

[G. Branden Robinson]

URL:
  <https://savannah.gnu.org/bugs/?66009>

                 Summary: [troff] accepts `|` as operand delimiter, but should
not
                   Group: GNU roff
               Submitter: gbranden
               Submitted: Sat 20 Jul 2024 09:10:05 PM UTC
                Category: Core
                Severity: 3 - Normal
              Item Group: Warning/Suspicious behaviour
                  Status: In Progress
                 Privacy: Public
             Assigned to: gbranden
             Open/Closed: Open
         Discussion Lock: Any
         Planned Release: None


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Follow-up Comments:


-------------------------------------------------------
Date: Sat 20 Jul 2024 09:10:05 PM UTC By: G. Branden Robinson <gbranden>
My revamp of numerical expression handling exposed a bug.

`|` was being accepted as a delimiter in conditional expressions (for
formatted output and string comparisons), but should not have been.

Why?

Because it is a valid character in a _numeric_ expression, which conditional
expressions also interpret.

Example:


.sp |432u


DWB 3.3, Heirloom Doctools, and Solaris 10 _troff_s all fail to interpret `|`
as a delimiter.


$ echo '.if |foo|foo| .tm they are the same' | nroff


...silently exits without output in all of them.








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