URL: <https://savannah.gnu.org/bugs/?67285>
Summary: [eqn] mangles UTF-8 (or other bytes with eighth bit
set) characters it should pass through
Group: GNU roff
Submitter: gbranden
Submitted: Sun 06 Jul 2025 10:44:37 AM GMT
Category: Preprocessor eqn
Severity: 3 - Normal
Item Group: Incorrect 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:
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Date: Sun 06 Jul 2025 10:44:37 AM GMT By: G. Branden Robinson <gbranden>
Reproducer:
$ printf '.\\" degree sign: \313\232\n' | ~/groff-1.23.0/bin/eqn
.do if !dEQ .ds EQ
.do if !dEN .ds EN
.if !'\*(.T'ps' .if !'\*(.T'html' .tm warning:
/home/branden/groff-1.23.0/bin/eqn should have been given a '-T\*(.T' option
.if '\*(.T'html' .if !'ps'ps' .tm warning: /home/branden/groff-1.23.0/bin/eqn
should have been given a '-Tps' option
.if '\*(.T'html' .if !'ps'ps' .tm warning: (it is advisable to invoke groff
via: groff -Thtml -e)
.lf 1 /home/branden/groff-stable/share/groff/1.23.0/tmac/eqnrc
.\" -*- nroff -*-
.\"
.\" Startup file for eqn.
.do if !d EQ .ds EQ
.do if !d EN .ds EN
.EQ
.nr 0C \n(.C
.cp 0
.ds 10
.cp \n(0C
.lf 7
.EN
.lf 1 -
/home/branden/groff-1.23.0/bin/eqn:<standard input>:1: error: invalid input
(character code 154)
.\" degree sign: �
GNU _eqn_ mangles the input into an invalid UTF-8 sequence.
$ printf '.\\" degree sign: \313\232\n' | ~/groff-1.23.0/bin/eqn | od -c |
tail -n 3
/home/branden/groff-1.23.0/bin/eqn:<standard input>:1: error: invalid input
(character code 154)
0001100 N \n . l f 1 - \n . \ " d e
0001120 g r e e s i g n : 313 \n
0001135
Problem reproducible with _groff_ 1.23.0, 1.22.4, and 1.22.3. Might go back a
long way.
_eqn_ is entitled to reject and complain about invalid character codes in
"_eqn_ regions" of a document, but outside of those, it should be a simple,
non-interpreting filter.
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