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Re: [groff] Heirloom: text disappearing when output line trap + interrup
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From: |
Tadziu Hoffmann |
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Subject: |
Re: [groff] Heirloom: text disappearing when output line trap + interrupted text |
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Date: |
Wed, 24 Apr 2019 15:59:37 +0200 |
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User-agent: |
Mutt/1.9.1 (2017-09-22) |
> Have Ultrix rise again?
> https://www.in-ulm.de/~mascheck/various/ancient/
Indeed! Didn't know this existed, but it's been an eye-opener.
I ran the PDP-11 emulator with v7 Unix, and the included nroff
(this appears to be pre-DIT n/troff, as troff just produced
gibberish probably intended for a C/A/T) with this input:
# cat test.ro
.po 0
.ll 100p
.de CC
..
.di XX
AAA\c
AAA BBB BBB .CCC CCC
DDD DDD DDD DDD DDD
.br
.di
.XX
AAA\c
AAA BBB BBB .CCC CCC
DDD DDD DDD DDD DDD
produced the following output:
# nroff test.ro
AAAAAA BBB BBB
DDD DDD DDD
DDD
AAAAAA BBB BBB
.CCC CCC DDD
DDD DDD DDD
DDD
So, to answer the original question: it appears to be a feature
of Heirloom roff based on the behavior of AT&T roff.
I really hadn't expected this.