URL: <https://savannah.gnu.org/bugs/?65983>
Summary: [troff] starts document preumaturely upon `lf`
request
Group: GNU roff
Submitter: gbranden
Submitted: Sat 13 Jul 2024 07:36:37 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
_______________________________________________________
Follow-up Comments:
-------------------------------------------------------
Date: Sat 13 Jul 2024 07:36:37 AM UTC By: G. Branden Robinson <gbranden>
...angering output drivers.
Spawned off of bug #65980.
Use of preprocessors with empty inputs causes the formatter to produce output
that provokes complaints from output drivers.
Example:
$ echo . | tbl
.if !\n(.g .ab GNU tbl requires groff extensions; aborting
.do if !dTS .ds TS
.do if !dT& .ds T&
.do if !dTE .ds TE
.lf 1 -
.
$ echo . | tbl | nroff
grotty:<standard input>:(<standard input>):6: fatal error: 'V' command invalid
before first 'p' command
So what's the problem?
$ echo . | tbl | nroff -Z
x T utf8
x res 240 24 40
x init
x F -
x trailer
V2640
x stop
Experimentation reveals that
.lf 1 -
...is the culprit.
$ echo ".lf 1 -" | nroff
grotty:<standard input>:(<standard input>):6: fatal error: 'V' command invalid
before first 'p' command
_______________________________________________________
Reply to this item at:
<https://savannah.gnu.org/bugs/?65983>
_______________________________________________
Message sent via Savannah
https://savannah.gnu.org/
signature.asc
Description: PGP signature
