From 25da273366ceefa9ff28507f7f44a8f5b574aae6 Mon Sep 17 00:00:00 2001
From: schwarze <schwarze@openbsd.org>
Date: Wed, 24 Dec 2014 23:31:59 +0000
Subject: [PATCH] Support negative indentations for mdoc(7) displays and lists.
 Not exactly recommended for use, rather for groff compatibility. While here,
 introduce similar SHRT_MAX limits as in man(7), fixing a few cases of
 infinite output found by jsg@ with afl.

---
 regress/usr.bin/mandoc/mdoc/Bd/Makefile       |   9 +-
 regress/usr.bin/mandoc/mdoc/Bd/offset-neg.in  |  24 ++++
 .../mandoc/mdoc/Bd/offset-neg.out_ascii       |  21 ++++
 regress/usr.bin/mandoc/mdoc/Bl/bullet.in      |  18 ++-
 .../usr.bin/mandoc/mdoc/Bl/bullet.out_ascii   |  14 ++-
 regress/usr.bin/mandoc/mdoc/Bl/dash.in        |  18 ++-
 regress/usr.bin/mandoc/mdoc/Bl/dash.out_ascii |  14 ++-
 regress/usr.bin/mandoc/mdoc/Bl/enum.in        |  22 +++-
 regress/usr.bin/mandoc/mdoc/Bl/enum.out_ascii |  17 ++-
 regress/usr.bin/mandoc/mdoc/Bl/hang.in        |  47 +++++++-
 regress/usr.bin/mandoc/mdoc/Bl/hang.out_ascii |  38 ++++++-
 regress/usr.bin/mandoc/mdoc/Bl/offset.in      |  10 +-
 .../usr.bin/mandoc/mdoc/Bl/offset.out_ascii   |   6 +-
 regress/usr.bin/mandoc/mdoc/Bl/tag.in         |  38 ++++++-
 regress/usr.bin/mandoc/mdoc/Bl/tag.out_ascii  |  36 +++++-
 usr.bin/mandoc/mdoc_man.c                     |  57 +++++-----
 usr.bin/mandoc/mdoc_term.c                    | 107 ++++++++++--------
 usr.bin/mandoc/term.c                         |   4 +-
 18 files changed, 403 insertions(+), 97 deletions(-)
 create mode 100644 regress/usr.bin/mandoc/mdoc/Bd/offset-neg.in
 create mode 100644 regress/usr.bin/mandoc/mdoc/Bd/offset-neg.out_ascii

diff --git a/regress/usr.bin/mandoc/mdoc/Bd/Makefile b/regress/usr.bin/mandoc/mdoc/Bd/Makefile
index 1971ec3f0a1..817d9fe71ad 100644
--- a/regress/usr.bin/mandoc/mdoc/Bd/Makefile
+++ b/regress/usr.bin/mandoc/mdoc/Bd/Makefile
@@ -1,17 +1,18 @@
-# $OpenBSD: Makefile,v 1.17 2014/11/10 20:59:41 schwarze Exp $
+# $OpenBSD: Makefile,v 1.18 2014/12/24 23:31:59 schwarze Exp $
 
 REGRESS_TARGETS	 = beforeNAME blank centered nested spacing
-REGRESS_TARGETS	+= badargs empty offset-empty
+REGRESS_TARGETS	+= badargs empty offset-empty offset-neg
 REGRESS_TARGETS	+= break broken unclosed
 
 LINT_TARGETS	 = beforeNAME blank nested badargs break broken unclosed
 
 SKIP_TMAN	 = beforeNAME centered
 
-# groff-1.22.2 defect:
+# groff-1.22.3 defects:
 # - a display breaking another block continues indefinitely
+# - negative offsets take no effect, but advance the indention on exit
 
-SKIP_GROFF	 = break
+SKIP_GROFF	 = break offset-neg
 
 # adjustment is disabled in groff for now
 
diff --git a/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.in b/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.in
new file mode 100644
index 00000000000..30f0fe73217
--- /dev/null
+++ b/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.in
@@ -0,0 +1,24 @@
+.Dd December 24, 2014
+.Dt BD-INDENT 1
+.Os OpenBSD
+.Sh NAME
+.Nm Bd-indent
+.Nd indenting display blocks
+.Sh DESCRIPTION
+regular text
+.Bd -ragged -offset 8n
+outer display
+.Bd -ragged -offset -5n
+inner display
+.Ed
+outer display
+.Ed
+regular text
+.Bd -ragged -offset -3n
+outer display
+.Bd -ragged -offset 8n
+inner display
+.Ed
+outer display
+.Ed
+regular text
diff --git a/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.out_ascii b/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.out_ascii
new file mode 100644
index 00000000000..0ecf61cf48f
--- /dev/null
+++ b/regress/usr.bin/mandoc/mdoc/Bd/offset-neg.out_ascii
@@ -0,0 +1,21 @@
+BD-INDENT(1)                General Commands Manual               BD-INDENT(1)
+
+NNAAMMEE
+     BBdd--iinnddeenntt - indenting display blocks
+
+DDEESSCCRRIIPPTTIIOONN
+     regular text
+
+             outer display
+
+        inner display
+             outer display
+     regular text
+
+  outer display
+
+          inner display
+  outer display
+     regular text
+
+OpenBSD                        December 24, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/bullet.in b/regress/usr.bin/mandoc/mdoc/Bl/bullet.in
index 13a58f338af..e189df2770b 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/bullet.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/bullet.in
@@ -1,10 +1,26 @@
-.Dd June 17, 2009
+.Dd December 25, 2014
 .Dt BL-BULLET 1
 .Os OpenBSD
 .Sh NAME
 .Nm Bl-bullet
 .Nd bullet lists
 .Sh DESCRIPTION
+.Bl -bullet -width -4n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -bullet -width -3n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -bullet -width -2n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -bullet -width -1n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
 .Bl -bullet -width 0n
 .It
 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/bullet.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/bullet.out_ascii
index 8da2173be43..e188f799e08 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/bullet.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/bullet.out_ascii
@@ -4,6 +4,18 @@ NNAAMMEE
      BBll--bbuulllleett - bullet lists
 
 DDEESSCCRRIIPPTTIIOONN
+     ++oo x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x x x
+
+     ++oo x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x x
+
+     ++oo x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x x
+
+     ++oo x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x
+
      ++oo x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
        x x x x
 
@@ -52,4 +64,4 @@ DDEESSCCRRIIPPTTIIOONN
      ++oo   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
          x x x x x
 
-OpenBSD                          June 17, 2009                         OpenBSD
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/dash.in b/regress/usr.bin/mandoc/mdoc/Bl/dash.in
index 92e36821f72..37c8ad1a101 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/dash.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/dash.in
@@ -1,10 +1,26 @@
-.Dd June 17, 2009
+.Dd December 25, 2014
 .Dt BL-DASH 1
 .Os OpenBSD
 .Sh NAME
 .Nm Bl-dash
 .Nd dash and hyphen lists
 .Sh DESCRIPTION
+.Bl -dash -width -4n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -dash -width -3n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -dash -width -2n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -dash -width -1n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
 .Bl -dash -width 0n
 .It
 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/dash.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/dash.out_ascii
index f2a53dc1190..f6677bee86a 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/dash.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/dash.out_ascii
@@ -4,6 +4,18 @@ NNAAMMEE
      BBll--ddaasshh - dash and hyphen lists
 
 DDEESSCCRRIIPPTTIIOONN
+     -- x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x x x
+
+     -- x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x x
+
+     -- x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x x
+
+     -- x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x
+
      -- x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
        x x x x
 
@@ -52,4 +64,4 @@ DDEESSCCRRIIPPTTIIOONN
      --   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
          x x x x x
 
-OpenBSD                          June 17, 2009                         OpenBSD
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/enum.in b/regress/usr.bin/mandoc/mdoc/Bl/enum.in
index a2cc696f155..e5b1c618093 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/enum.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/enum.in
@@ -1,10 +1,30 @@
-.Dd June 17, 2009
+.Dd December 25, 2014
 .Dt BL-ENUM 1
 .Os OpenBSD
 .Sh NAME
 .Nm Bl-enum
 .Nd enumerated lists
 .Sh DESCRIPTION
+.Bl -enum -width -4n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -enum -width -3n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -enum -width -2n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -enum -width -1n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -enum -width 0n
+.It
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
 .Bl -enum -width 1n
 .It
 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/enum.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/enum.out_ascii
index 71e4a7fdc96..769dc21889f 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/enum.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/enum.out_ascii
@@ -4,6 +4,21 @@ NNAAMMEE
      BBll--eennuumm - enumerated lists
 
 DDEESSCCRRIIPPTTIIOONN
+     1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x x x x
+
+     1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x x x
+
+     1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x x x
+
+     1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x x
+
+     1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+       x x x x x
+
      1. x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
         x x x x x
 
@@ -49,4 +64,4 @@ DDEESSCCRRIIPPTTIIOONN
      12.  x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
           x x x x x x
 
-OpenBSD                          June 17, 2009                         OpenBSD
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/hang.in b/regress/usr.bin/mandoc/mdoc/Bl/hang.in
index 4b4e2d72b3d..2b2b755457f 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/hang.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/hang.in
@@ -1,10 +1,55 @@
-.Dd April 8, 2014
+.Dd December 25, 2014
 .Dt BL-HANG 1
 .Os OpenBSD
 .Sh NAME
 .Nm Bl-hang
 .Nd hanged lists
 .Sh DESCRIPTION
+.Bl -hang -width -4n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width -3n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width -2n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width -1n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width 0n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width 1n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width 2n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width 3n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -hang -width 4n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
 .Bl -hang -width 5n
 .It tag
 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/hang.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/hang.out_ascii
index 1081c09a1e8..04cce936627 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/hang.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/hang.out_ascii
@@ -4,6 +4,42 @@ NNAAMMEE
      BBll--hhaanngg - hanged lists
 
 DDEESSCCRRIIPPTTIIOONN
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+       x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+       x x x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x x x x x x
+
+     tag x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+         x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+         x x x x x x x x x x
+
+     tag  x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+          x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+          x x x x x x x x x x x x
+
+     tag   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+           x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+           x x x x x x x x x x x x
+
      tag    x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
             x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
             x x x x x x x x x x x x x x
@@ -46,4 +82,4 @@ DDEESSCCRRIIPPTTIIOONN
 
      tag     text
 
-OpenBSD                          April 8, 2014                         OpenBSD
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/offset.in b/regress/usr.bin/mandoc/mdoc/Bl/offset.in
index 4e5b334fbda..9564b105ac2 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/offset.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/offset.in
@@ -1,4 +1,4 @@
-.Dd November 20, 2014
+.Dd December 25, 2014
 .Dt BL-OFFSET 1
 .Os OpenBSD
 .Sh NAME
@@ -37,6 +37,10 @@ Bl item offset Ds
 .It
 Bl item offset 78n
 .El
+.Bl -item -offset -3n
+.It
+Bl item offset -3n
+.El
 .Bl -tag -width Ds -offset
 .It tag
 Bl tag width Ds offset empty
@@ -69,3 +73,7 @@ Bl tag width Ds offset Ds
 .It tag
 Bl tag width Ds offset 78n
 .El
+.Bl -tag -width Ds -offset -3n
+.It tag
+Bl tag width Ds offset -3n
+.El
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/offset.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/offset.out_ascii
index 345b583870b..8c871d44660 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/offset.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/offset.out_ascii
@@ -23,6 +23,8 @@ DDEESSCCRRIIPPTTIIOONN
                                                                                    offset
                                                                                    78n
 
+  Bl item offset -3n
+
      tag     Bl tag width Ds offset empty
 
          tag     Bl tag width Ds offset left
@@ -44,4 +46,6 @@ DDEESSCCRRIIPPTTIIOONN
                                                                                            offset
                                                                                            78n
 
-OpenBSD                        November 20, 2014                       OpenBSD
+  tag     Bl tag width Ds offset -3n
+
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/tag.in b/regress/usr.bin/mandoc/mdoc/Bl/tag.in
index 649da804535..ee2d1b46d70 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/tag.in
+++ b/regress/usr.bin/mandoc/mdoc/Bl/tag.in
@@ -1,10 +1,46 @@
-.Dd November 16, 2014
+.Dd December 25, 2014
 .Dt BL-TAG 1
 .Os OpenBSD
 .Sh NAME
 .Nm Bl-tag
 .Nd tagged lists
 .Sh DESCRIPTION
+.Bl -tag -width -4n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width -3n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width -2n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width -1n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width 0n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width 1n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width 2n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width 3n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
+.Bl -tag -width 4n
+.It tag
+x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+.El
 .Bl -tag -width 5n
 .It tag
 x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
diff --git a/regress/usr.bin/mandoc/mdoc/Bl/tag.out_ascii b/regress/usr.bin/mandoc/mdoc/Bl/tag.out_ascii
index 959b1c8a4b8..a112c5b8729 100644
--- a/regress/usr.bin/mandoc/mdoc/Bl/tag.out_ascii
+++ b/regress/usr.bin/mandoc/mdoc/Bl/tag.out_ascii
@@ -4,6 +4,40 @@ NNAAMMEE
      BBll--ttaagg - tagged lists
 
 DDEESSCCRRIIPPTTIIOONN
+     tag
+   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+   x x
+
+     tag
+    x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+    x x x
+
+     tag
+     x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+     x x x
+
+     tag
+      x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+      x x x x
+
+     tag
+       x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+       x x x x
+
+     tag
+        x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+        x x x x x
+
+     tag
+         x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+         x x x x x
+
+     tag  x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+          x x x x x x
+
+     tag   x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
+           x x x x x x
+
      tag    x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x x
             x x x x x x x
 
@@ -77,4 +111,4 @@ DDEESSCCRRIIPPTTIIOONN
 
              second paragraph
 
-OpenBSD                        November 16, 2014                       OpenBSD
+OpenBSD                        December 25, 2014                       OpenBSD
diff --git a/usr.bin/mandoc/mdoc_man.c b/usr.bin/mandoc/mdoc_man.c
index 28cede1fd0b..5f420e580b1 100644
--- a/usr.bin/mandoc/mdoc_man.c
+++ b/usr.bin/mandoc/mdoc_man.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mdoc_man.c,v 1.78 2014/12/23 13:48:15 schwarze Exp $ */
+/*	$OpenBSD: mdoc_man.c,v 1.79 2014/12/24 23:31:59 schwarze Exp $ */
 /*
  * Copyright (c) 2011, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
  *
@@ -114,8 +114,8 @@ static	void	  print_word(const char *);
 static	void	  print_line(const char *, int);
 static	void	  print_block(const char *, int);
 static	void	  print_offs(const char *, int);
-static	void	  print_width(const char *,
-				const struct mdoc_node *, size_t);
+static	void	  print_width(const struct mdoc_bl *,
+			const struct mdoc_node *);
 static	void	  print_count(int *);
 static	void	  print_node(DECL_ARGS);
 
@@ -263,7 +263,7 @@ static	int		outflags;
 
 #define	BL_STACK_MAX	32
 
-static	size_t		Bl_stack[BL_STACK_MAX];  /* offsets [chars] */
+static	int		Bl_stack[BL_STACK_MAX];  /* offsets [chars] */
 static	int		Bl_stack_post[BL_STACK_MAX];  /* add final .RE */
 static	int		Bl_stack_len;  /* number of nested Bl blocks */
 static	int		TPremain;  /* characters before tag is full */
@@ -421,7 +421,7 @@ print_offs(const char *v, int keywords)
 {
 	char		  buf[24];
 	struct roffsu	  su;
-	size_t		  sz;
+	int		  sz;
 
 	print_line(".RS", MMAN_Bk_susp);
 
@@ -433,8 +433,6 @@ print_offs(const char *v, int keywords)
 	else if (keywords && !strcmp(v, "indent-two"))
 		sz = 12;
 	else if (a2roffsu(v, &su, SCALE_EN) > 1) {
-		if (su.scale < 0.0)
-			su.scale = 0.0;
 		if (SCALE_EN == su.unit)
 			sz = su.scale;
 		else {
@@ -459,7 +457,7 @@ print_offs(const char *v, int keywords)
 	if (Bl_stack_len)
 		sz += Bl_stack[Bl_stack_len - 1];
 
-	(void)snprintf(buf, sizeof(buf), "%zun", sz);
+	(void)snprintf(buf, sizeof(buf), "%dn", sz);
 	print_word(buf);
 	outflags |= MMAN_nl;
 }
@@ -468,22 +466,19 @@ print_offs(const char *v, int keywords)
  * Set up the indentation for a list item; used from pre_it().
  */
 static void
-print_width(const char *v, const struct mdoc_node *child, size_t defsz)
+print_width(const struct mdoc_bl *bl, const struct mdoc_node *child)
 {
 	char		  buf[24];
 	struct roffsu	  su;
-	size_t		  sz, chsz;
-	int		  numeric, remain;
+	int		  numeric, remain, sz, chsz;
 
 	numeric = 1;
 	remain = 0;
 
-	/* Convert v into a number (of characters). */
-	if (NULL == v)
-		sz = defsz;
-	else if (a2roffsu(v, &su, SCALE_MAX) > 1) {
-		if (su.scale < 0.0)
-			su.scale = 0.0;
+	/* Convert the width into a number (of characters). */
+	if (bl->width == NULL)
+		sz = (bl->type == LIST_hang) ? 6 : 0;
+	else if (a2roffsu(bl->width, &su, SCALE_MAX) > 1) {
 		if (SCALE_EN == su.unit)
 			sz = su.scale;
 		else {
@@ -491,11 +486,15 @@ print_width(const char *v, const struct mdoc_node *child, size_t defsz)
 			numeric = 0;
 		}
 	} else
-		sz = strlen(v);
+		sz = strlen(bl->width);
 
 	/* XXX Rough estimation, might have multiple parts. */
-	chsz = (NULL != child && MDOC_TEXT == child->type) ?
-	    strlen(child->string) : 0;
+	if (bl->type == LIST_enum)
+		chsz = (bl->count > 8) + 1;
+	else if (child != NULL && child->type == MDOC_TEXT)
+		chsz = strlen(child->string);
+	else
+		chsz = 0;
 
 	/* Maybe we are inside an enclosing list? */
 	mid_it();
@@ -507,17 +506,17 @@ print_width(const char *v, const struct mdoc_node *child, size_t defsz)
 	Bl_stack[Bl_stack_len++] = sz + 2;
 
 	/* Set up the current list. */
-	if (defsz && chsz > sz)
+	if (chsz > sz && bl->type != LIST_tag)
 		print_block(".HP", 0);
 	else {
 		print_block(".TP", 0);
 		remain = sz + 2;
 	}
 	if (numeric) {
-		(void)snprintf(buf, sizeof(buf), "%zun", sz + 2);
+		(void)snprintf(buf, sizeof(buf), "%dn", sz + 2);
 		print_word(buf);
 	} else
-		print_word(v);
+		print_word(bl->width);
 	TPremain = remain;
 }
 
@@ -526,7 +525,7 @@ print_count(int *count)
 {
 	char		  buf[24];
 
-	(void)snprintf(buf, sizeof(buf), "%d.", ++*count);
+	(void)snprintf(buf, sizeof(buf), "%d.\\&", ++*count);
 	print_word(buf);
 }
 
@@ -1364,7 +1363,7 @@ pre_it(DECL_ARGS)
 		case LIST_dash:
 			/* FALLTHROUGH */
 		case LIST_hyphen:
-			print_width(bln->norm->Bl.width, NULL, 0);
+			print_width(&bln->norm->Bl, NULL);
 			TPremain = 0;
 			outflags |= MMAN_nl;
 			font_push('B');
@@ -1376,19 +1375,19 @@ pre_it(DECL_ARGS)
 			outflags |= MMAN_nl;
 			return(0);
 		case LIST_enum:
-			print_width(bln->norm->Bl.width, NULL, 0);
+			print_width(&bln->norm->Bl, NULL);
 			TPremain = 0;
 			outflags |= MMAN_nl;
 			print_count(&bln->norm->Bl.count);
 			outflags |= MMAN_nl;
 			return(0);
 		case LIST_hang:
-			print_width(bln->norm->Bl.width, n->child, 6);
+			print_width(&bln->norm->Bl, n->child);
 			TPremain = 0;
 			outflags |= MMAN_nl;
 			return(1);
 		case LIST_tag:
-			print_width(bln->norm->Bl.width, n->child, 0);
+			print_width(&bln->norm->Bl, n->child);
 			putchar('\n');
 			outflags &= ~MMAN_spc;
 			return(1);
@@ -1420,7 +1419,7 @@ mid_it(void)
 
 	/* Restore the indentation of the enclosing list. */
 	print_line(".RS", MMAN_Bk_susp);
-	(void)snprintf(buf, sizeof(buf), "%zun",
+	(void)snprintf(buf, sizeof(buf), "%dn",
 	    Bl_stack[Bl_stack_len - 1]);
 	print_word(buf);
 
diff --git a/usr.bin/mandoc/mdoc_term.c b/usr.bin/mandoc/mdoc_term.c
index 902f5bdc4dc..0933dba0478 100644
--- a/usr.bin/mandoc/mdoc_term.c
+++ b/usr.bin/mandoc/mdoc_term.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: mdoc_term.c,v 1.200 2014/12/23 13:48:15 schwarze Exp $ */
+/*	$OpenBSD: mdoc_term.c,v 1.201 2014/12/24 23:31:59 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010, 2012, 2013, 2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -20,6 +20,7 @@
 
 #include <assert.h>
 #include <ctype.h>
+#include <limits.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -47,7 +48,7 @@ struct	termact {
 	void	(*post)(DECL_ARGS);
 };
 
-static	size_t	  a2width(const struct termp *, const char *);
+static	int	  a2width(const struct termp *, const char *);
 
 static	void	  print_bvspace(struct termp *,
 			const struct mdoc_node *,
@@ -523,7 +524,7 @@ print_mdoc_head(struct termp *p, const void *arg)
 	free(volume);
 }
 
-static size_t
+static int
 a2width(const struct termp *p, const char *v)
 {
 	struct roffsu	 su;
@@ -531,9 +532,7 @@ a2width(const struct termp *p, const char *v)
 	if (a2roffsu(v, &su, SCALE_MAX) < 2) {
 		SCALE_HS_INIT(&su, term_strlen(p, v));
 		su.scale /= term_strlen(p, "0");
-	} else if (su.scale < 0.0)
-		su.scale = 0.0;
-
+	}
 	return(term_hspan(p, &su));
 }
 
@@ -604,10 +603,10 @@ termp_ll_pre(DECL_ARGS)
 static int
 termp_it_pre(DECL_ARGS)
 {
-	const struct mdoc_node *bl, *nn;
 	char			buf[24];
-	int			i;
-	size_t			width, offset, ncols, dcol;
+	const struct mdoc_node *bl, *nn;
+	size_t			ncols, dcol;
+	int			i, offset, width;
 	enum mdoc_list		type;
 
 	if (MDOC_BLOCK == n->type) {
@@ -618,16 +617,47 @@ termp_it_pre(DECL_ARGS)
 	bl = n->parent->parent->parent;
 	type = bl->norm->Bl.type;
 
+	/*
+	 * Defaults for specific list types.
+	 */
+
+	switch (type) {
+	case LIST_bullet:
+		/* FALLTHROUGH */
+	case LIST_dash:
+		/* FALLTHROUGH */
+	case LIST_hyphen:
+		/* FALLTHROUGH */
+	case LIST_enum:
+		width = term_len(p, 2);
+		break;
+	case LIST_hang:
+		width = term_len(p, 8);
+		break;
+	case LIST_column:
+		/* FALLTHROUGH */
+	case LIST_tag:
+		width = term_len(p, 10);
+		break;
+	default:
+		width = 0;
+		break;
+	}
+	offset = 0;
+
 	/*
 	 * First calculate width and offset.  This is pretty easy unless
 	 * we're a -column list, in which case all prior columns must
 	 * be accounted for.
 	 */
 
-	width = offset = 0;
-
-	if (bl->norm->Bl.offs)
+	if (bl->norm->Bl.offs != NULL) {
 		offset = a2width(p, bl->norm->Bl.offs);
+		if (offset < 0 && (size_t)(-offset) > p->offset)
+			offset = -p->offset;
+		else if (offset > SHRT_MAX)
+			offset = 0;
+	}
 
 	switch (type) {
 	case LIST_column:
@@ -682,39 +712,11 @@ termp_it_pre(DECL_ARGS)
 		 * number for buffering single arguments.  See the above
 		 * handling for column for how this changes.
 		 */
-		assert(bl->norm->Bl.width);
 		width = a2width(p, bl->norm->Bl.width) + term_len(p, 2);
-		break;
-	}
-
-	/*
-	 * List-type can override the width in the case of fixed-head
-	 * values (bullet, dash/hyphen, enum).  Tags need a non-zero
-	 * offset.
-	 */
-
-	switch (type) {
-	case LIST_bullet:
-		/* FALLTHROUGH */
-	case LIST_dash:
-		/* FALLTHROUGH */
-	case LIST_hyphen:
-		/* FALLTHROUGH */
-	case LIST_enum:
-		if (width < term_len(p, 2))
-			width = term_len(p, 2);
-		break;
-	case LIST_hang:
-		if (0 == width)
-			width = term_len(p, 8);
-		break;
-	case LIST_column:
-		/* FALLTHROUGH */
-	case LIST_tag:
-		if (0 == width)
-			width = term_len(p, 10);
-		break;
-	default:
+		if (width < 0 && (size_t)(-width) > p->offset)
+			width = -p->offset;
+		else if (width > SHRT_MAX)
+			width = 0;
 		break;
 	}
 
@@ -760,16 +762,16 @@ termp_it_pre(DECL_ARGS)
 	case LIST_enum:
 		/*
 		 * Weird special case.
-		 * Very narrow enum lists actually hang.
+		 * Some very narrow lists actually hang.
 		 */
-		if (width == term_len(p, 2))
-			p->flags |= TERMP_HANG;
 		/* FALLTHROUGH */
 	case LIST_bullet:
 		/* FALLTHROUGH */
 	case LIST_dash:
 		/* FALLTHROUGH */
 	case LIST_hyphen:
+		if (width <= (int)term_len(p, 2))
+			p->flags |= TERMP_HANG;
 		if (MDOC_HEAD != n->type)
 			break;
 		p->flags |= TERMP_NOBREAK;
@@ -858,7 +860,6 @@ termp_it_pre(DECL_ARGS)
 	case LIST_hyphen:
 		/* FALLTHROUGH */
 	case LIST_tag:
-		assert(width);
 		if (MDOC_HEAD == n->type)
 			p->rmargin = p->offset + width;
 		else
@@ -1538,6 +1539,7 @@ termp_bd_pre(DECL_ARGS)
 {
 	size_t			 tabwidth, lm, len, rm, rmax;
 	struct mdoc_node	*nn;
+	int			 offset;
 
 	if (MDOC_BLOCK == n->type) {
 		print_bvspace(p, n, n);
@@ -1554,8 +1556,13 @@ termp_bd_pre(DECL_ARGS)
 		p->offset += term_len(p, p->defindent + 1);
 	else if ( ! strcmp(n->norm->Bd.offs, "indent-two"))
 		p->offset += term_len(p, (p->defindent + 1) * 2);
-	else
-		p->offset += a2width(p, n->norm->Bd.offs);
+	else {
+		offset = a2width(p, n->norm->Bd.offs);
+		if (offset < 0 && (size_t)(-offset) > p->offset)
+			p->offset = 0;
+		else if (offset < SHRT_MAX)
+			p->offset += offset;
+	}
 
 	/*
 	 * If -ragged or -filled are specified, the block does nothing
diff --git a/usr.bin/mandoc/term.c b/usr.bin/mandoc/term.c
index 76836aac3ef..ee247461963 100644
--- a/usr.bin/mandoc/term.c
+++ b/usr.bin/mandoc/term.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: term.c,v 1.101 2014/12/24 09:57:41 schwarze Exp $ */
+/*	$OpenBSD: term.c,v 1.102 2014/12/24 23:31:59 schwarze Exp $ */
 /*
  * Copyright (c) 2008, 2009, 2010, 2011 Kristaps Dzonsons <kristaps@bsd.lv>
  * Copyright (c) 2010-2014 Ingo Schwarze <schwarze@openbsd.org>
@@ -271,7 +271,7 @@ term_flushln(struct termp *p)
 	}
 
 	if (TERMP_HANG & p->flags) {
-		p->overstep = (int)(vis - maxvis +
+		p->overstep += (int)(p->offset + vis - p->rmargin +
 		    p->trailspace * (*p->width)(p, ' '));
 
 		/*
-- 
2.20.1