URL:
<https://savannah.gnu.org/bugs/?64308>
Summary: [troff] should warn of negative arguments to
\D'{c,e,E}' drawing commands
Group: GNU roff
Submitter: gbranden
Submitted: Fri 16 Jun 2023 03:36:00 AM UTC
Category: Core
Severity: 3 - Normal
Item Group: Warning/Suspicious behaviour
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Planned Release: None
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Follow-up Comments:
-------------------------------------------------------
Date: Fri 16 Jun 2023 03:36:00 AM UTC By: G. Branden Robinson <gbranden>
It doesn't make any sense for a circle to have a negative diameter or an
ellipse to have axes of negative length.
Yet GNU troff accepts this and happily delivers this nonsense to output
drivers.
It should not.
$ groff -Z
\D'e -5 -2'
<Control+D>
x T ps
x res 72000 1 1
x init
p1
V12000
H72000
md
DFd
s10000
De -50000 -24000
n12000 0
x trailer
V792000
x stop
$ groff -Z
\D'c -10'
<Control+D>
x T ps
x res 72000 1 1
x init
p1
V12000
H72000
md
DFd
s10000
Dc -100000
n12000 0
x trailer
V792000
x stop
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