add the \(ru (0.5m baseline ruler) character escape sequence,

abused by mail/nmh; groff_char(7) confirms that this really exists

6 files changed, 9 insertions, 7 deletions

diff --git a/regress/usr.bin/mandoc/char/unicode/ascii.in b/regress/usr.bin/mandoc/char/unicode/ascii.in
index c75da2c05da..66664155cb8 100644
--- a/regress/usr.bin/mandoc/char/unicode/ascii.in
+++ b/regress/usr.bin/mandoc/char/unicode/ascii.in
@@ -18,7 +18,7 @@ BEGINTEST
 \[u005C]\N'92'\e\(rs	REVERSE SOLIDUS
 \[u005D]\N'93'\(rB	RIGHT SQUARE BRACKET
 \[u005E]\N'94'\(a^\(ha	CIRCUMFLEX ACCENT
-\[u005F]\N'95'\(ul	LOW LINE
+\[u005F]\N'95'\(ul\(ru	LOW LINE
 \[u0060]\N'96'\`\(ga	GRAVE ACCENT
 \[u007B]\N'123'\(lC	LEFT CURLY BRACKET
 \[u007C]\N'124'\(ba\(or	VERTICAL LINE
diff --git a/regress/usr.bin/mandoc/char/unicode/ascii.out_ascii b/regress/usr.bin/mandoc/char/unicode/ascii.out_ascii
index 74b5d2861d1..f46e0f367e5 100644
--- a/regress/usr.bin/mandoc/char/unicode/ascii.out_ascii
+++ b/regress/usr.bin/mandoc/char/unicode/ascii.out_ascii
@@ -21,7 +21,7 @@ DDEESSCCRRIIPPTTIIOONN
        \\\\ REVERSE SOLIDUS
        ]]]  RIGHT SQUARE BRACKET
        ^^^^ CIRCUMFLEX ACCENT
-       ___  LOW LINE
+       ____ LOW LINE
        ```` GRAVE ACCENT
        {{{  LEFT CURLY BRACKET
        |||| VERTICAL LINE
diff --git a/regress/usr.bin/mandoc/char/unicode/ascii.out_html b/regress/usr.bin/mandoc/char/unicode/ascii.out_html
index deef5bcbf37..7ebda578849 100644
--- a/regress/usr.bin/mandoc/char/unicode/ascii.out_html
+++ b/regress/usr.bin/mandoc/char/unicode/ascii.out_html
@@ -13,7 +13,7 @@ $$$	DOLLAR SIGN
 \\\\	REVERSE SOLIDUS
 ]]]	RIGHT SQUARE BRACKET
 ^^^^	CIRCUMFLEX ACCENT
-___	LOW LINE
+____	LOW LINE
 ````	GRAVE ACCENT
 {{{	LEFT CURLY BRACKET
 ||||	VERTICAL LINE
diff --git a/regress/usr.bin/mandoc/char/unicode/ascii.out_utf8 b/regress/usr.bin/mandoc/char/unicode/ascii.out_utf8
index 74b5d2861d1..f46e0f367e5 100644
--- a/regress/usr.bin/mandoc/char/unicode/ascii.out_utf8
+++ b/regress/usr.bin/mandoc/char/unicode/ascii.out_utf8
@@ -21,7 +21,7 @@ DDEESSCCRRIIPPTTIIOONN
        \\\\ REVERSE SOLIDUS
        ]]]  RIGHT SQUARE BRACKET
        ^^^^ CIRCUMFLEX ACCENT
-       ___  LOW LINE
+       ____ LOW LINE
        ```` GRAVE ACCENT
        {{{  LEFT CURLY BRACKET
        |||| VERTICAL LINE
diff --git a/share/man/man7/mandoc_char.7 b/share/man/man7/mandoc_char.7
index e488a5e06bf..ff171435ad1 100644
--- a/share/man/man7/mandoc_char.7
+++ b/share/man/man7/mandoc_char.7
@@ -1,4 +1,4 @@
-.\"	$OpenBSD: mandoc_char.7,v 1.31 2017/06/02 12:41:28 schwarze Exp $
+.\"	$OpenBSD: mandoc_char.7,v 1.32 2017/06/14 20:56:42 schwarze Exp $
 .\"
 .\" Copyright (c) 2003 Jason McIntyre <jmc@openbsd.org>
 .\" Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
@@ -16,7 +16,7 @@
 .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: June 2 2017 $
+.Dd $Mdocdate: June 14 2017 $
 .Dt MANDOC_CHAR 7
 .Os
 .Sh NAME
@@ -260,6 +260,7 @@ Lines:
 .It \e(ba    Ta \(ba        Ta bar
 .It \e(br    Ta \(br        Ta box rule
 .It \e(ul    Ta \(ul        Ta underscore
+.It \e(ru    Ta \(ru        Ta underscore (width 0.5m)
 .It \e(rn    Ta \(rn        Ta overline
 .It \e(bb    Ta \(bb        Ta broken bar
 .It \e(sl    Ta \(sl        Ta forward slash
diff --git a/usr.bin/mandoc/chars.c b/usr.bin/mandoc/chars.c
index 2d174a5ecd2..13bb663a3a0 100644
--- a/usr.bin/mandoc/chars.c
+++ b/usr.bin/mandoc/chars.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: chars.c,v 1.40 2017/06/02 12:41:28 schwarze Exp $ */
+/*	$OpenBSD: chars.c,v 1.41 2017/06/14 20:56:42 schwarze Exp $ */
 /*
  * Copyright (c) 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2011, 2014, 2015, 2017 Ingo Schwarze <schwarze@openbsd.org>
@@ -59,6 +59,7 @@ static struct ln lines[] = {
 	{ "ba",			"|",		0x007c	},
 	{ "br",			"|",		0x2502	},
 	{ "ul",			"_",		0x005f	},
+	{ "ru",			"_",		0x005f	},
 	{ "rn",			"-",		0x203e	},
 	{ "bb",			"|",		0x00a6	},
 	{ "sl",			"/",		0x002f	},