URL: <https://savannah.gnu.org/bugs/?67747>
Summary: [troff] misleading diagnostic when `warnscale`
request given howlingly implausible argument
Group: GNU roff
Submitter: gbranden
Submitted: Sun 30 Nov 2025 10:46:37 AM UTC
Category: Core
Severity: 3 - Normal
Item Group: Warning/Suspicious behaviour
Status: In Progress
Privacy: Public
Assigned to: gbranden
Open/Closed: Open
Discussion Lock: Unlocked
Planned Release: None
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Follow-up Comments:
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Date: Sun 30 Nov 2025 10:46:37 AM UTC By: G. Branden Robinson <gbranden>
This is another old one.
The input validation logic assumed that the user of the `warnscale` request
would at least _try_ to make some kind of sense.
$ printf '.warnscale \\|\n' | ~/groff-1.22.3/bin/groff -aww
<standard input>:1: warning: invalid scaling indicator `', using `i' instead
$ printf '.warnscale \\|\n' | ~/groff-1.22.4/bin/groff -aww
troff: <standard input>:1: warning: invalid scaling indicator '', using 'i'
instead
$ printf '.warnscale \\|\n' | ~/groff-1.23.0/bin/groff -aww
troff:<standard input>:1: warning: scaling unit '' invalid; using 'i' instead
$ printf '.warnscale \\|\n' | ~/groff-HEAD/bin/groff -aww
troff:<standard input>:1: warning: scaling unit '0' invalid; using 'i'
instead
(Why `0` in HEAD? Because the `\|` escape sequence is not a character token,
and the validation logic assumed that what the user specified as the scaling
unit would be one.)
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