From 8b67872465026c8a36f46c94ab7c3c9cf281ba79 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Wed, 8 Jun 2022 13:23:57 +0000
Subject: Surprisingly, every escape sequence can also be used as an argument
 delimiter for an outer escape sequence, in which case the delimiting escape
 sequence retains its syntax but usually ignores its argument and loses its
 inherent effect.  Add rudimentary support for this syntax quirk in order to
 improve parsing compatibility with groff.

---
 regress/char/C/delim.in | 51 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 51 insertions(+)
 create mode 100644 regress/char/C/delim.in

(limited to 'regress/char/C/delim.in')

diff --git a/regress/char/C/delim.in b/regress/char/C/delim.in
new file mode 100644
index 00000000..db010d22
--- /dev/null
+++ b/regress/char/C/delim.in
@@ -0,0 +1,51 @@
+.\" $OpenBSD: delim.in,v 1.1 2022/06/08 13:08:00 schwarze Exp $
+.Dd $Mdocdate$
+.Dt C-DELIM 1
+.Os
+.Sh NAME
+.Nm C-delim
+.Nd argument delimiters for the C escape sequence
+.Sh DESCRIPTION
+empty: \C''
+.br
+single byte: \C'_'\C'-'
+.br
+two bytes: \C'hy'
+.br
+multiple bytes: \C'integral'
+.Ss Argument delimiters
+unsupported \er: \C\rat\ru
+.br
+ignored \e&: \C\&at\&u
+.br
+useless \e.: \C\.at.u
+.br
+invalid \eG: \C\GatGu
+.br
+special \e-: \C\-at\-u
+.br
+break \ep: \C\pat\pu
+.br
+nospace \ec: \C\cat\cu
+.\".br
+.\"XXX skipchar \ec: \C\zat\zu
+.br
+.ds mystr xatxu
+string expansion: \C\*[mystr]
+.br
+.nr myreg 1341
+register expansion: \C\n[myreg]u
+.br
+ignored \eON: \C\O1at\O2u
+.br
+special character: \C\(hyat\(hyu
+.br
+ignored \eZ\(aqstr\(aq: \C\Z'foo'at\Z'bar'u
+.br
+horizontal motion: \C\h'1'at\h'3'u
+.br
+horizontal line: \C\l'4'at\l'2'u
+.br
+overstrike: \C\o'ab'at\o'cd'u
+.br
+unterminated: \C'at
-- 
cgit