From d672f8cb82878baf3834e938c4c416f4493952cf Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Sat, 15 Dec 2018 19:30:25 +0000
Subject: Several improvements to escape sequence handling.

* Add the missing special character \_ (underscore).
* Partial implementations of \a (leader character)
and \E (uninterpreted escape character).
* Parse and ignore \r (reverse line feed).
* Add a WARNING message about undefined escape sequences.
* Add an UNSUPP message about unsupported escape sequences.
* Mark \! and \? (transparent throughput)
and \O (suppress output) as unsupported.
* Treat the various variants of zero-width spaces as one-byte escape
sequences rather than as special characters, to avoid defining bogus
forms with square brackets.
* For special characters with one-byte names, do not define bogus
forms with square brackets, except for \[-], which is valid.
* In the form with square brackets, undefined special characters do not
fall back to printing the name verbatim, not even for one-byte names.
* Starting a special character name with a blank is an error.
* Undefined escape sequences never abort formatting of the input
string, not even in HTML output mode.
* Document the newly handled escapes, and a few that were missing.
* Regression tests for most of the above.
---
 regress/char/space/esct-man.in | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

(limited to 'regress/char/space/esct-man.in')

diff --git a/regress/char/space/esct-man.in b/regress/char/space/esct-man.in
index e7afeefe..f290d9e2 100644
--- a/regress/char/space/esct-man.in
+++ b/regress/char/space/esct-man.in
@@ -1,5 +1,5 @@
 .\" $OpenBSD: esct-man.in,v 1.2 2017/07/04 14:53:23 schwarze Exp $
-.TH SPACE-ESCT-MAN 1 2013-06-20
+.TH SPACE-ESCT-MAN 1 "December 15, 2018"
 .SH NAME
 SPACE-T-MAN \- the t escape sequence in pages with man macros
 .SH DESCRIPTION
@@ -9,10 +9,14 @@ single	tab
 .br
 single\tescape-t
 .br
+single\aescape-a
+.br
 double		tab
 .br
 double\t\tescape-t
 .br
+double\a\aescape-a
+.br
 \tThis line starts with escape-t and comes close to the right margin.
 \tThe next line starts with escape-t as well.
 .sp
@@ -20,8 +24,10 @@ In a literal display:
 .nf
 single	tab
 single\tescape-t
+single\aescape-a
 double		tab
 double\t\tescape-t
+double\a\aescape-a
 .fi
 .sp
 After the IP macro:
@@ -29,7 +35,13 @@ After the IP macro:
 text
 .IP single\tescape-t 3n
 text
+.\" XXX not implemented
+.\" .IP single\aescape-a 3n
+.\" text
 .PP
 After font macros:
 .br
 .B single\ttab
+.\" XXX not implemented
+.\" .br
+.\" .B single\aleader
-- 
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