URL: <https://savannah.gnu.org/bugs/?67843>
Summary: [troff] initial "previous" value of page offset
inconsistent with other troffs in nroff mode
Group: GNU roff
Submitter: gbranden
Submitted: Sun 21 Dec 2025 05:04:17 PM UTC
Category: Core
Severity: 2 - Minor
Item Group: Incorrect 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:
-------------------------------------------------------
Date: Sun 21 Dec 2025 05:04:17 PM UTC By: G. Branden Robinson <gbranden>
input='.
.nf
foo
.po
bar
.po 5n
baz
.po
qux
.'
Giving that document to DWB 3.3, Heirloom, or Plan 9 _nroff_ produces the
following output.
$ ../src/roff/groff/tests/po-request-works.sh
foo
bar
baz
qux
Here's what _groff_ produces.
$ ../src/roff/groff/tests/po-request-works.sh
foo
bar
baz
qux
That's because GNU _troff_'s initial page offset is one inch, for the sake of
_troff_-mode devices. (Unlike other troffs, we don't have a separate
formatter program for terminals and line printers.) The macro files for the
_nroff_-mode devices update the page offset to zero, leaving "1i" as the
"previous" page offset.
I suspect the easiest fix for this is simply to have the macro files set the
same page offset explicitly twice in a row, to clobber the previous value to
zero. An explanatory comment will be in order.
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