From 318dcfc920386cbcdf23d6d81d97b72fabb8de35 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Mon, 9 Apr 2018 22:27:04 +0000
Subject: When accessing an undefined number register, define it to be zero,
 like the previous commit for strings and macros, only technically simpler.
 Desired behaviour also mentioned by Werner Lemberg in 2011. This diff adds
 functionality but is -21 +19 LOC.  :-)

---
 regress/roff/nr/Makefile        |  2 +-
 regress/roff/nr/undef.in        | 24 ++++++++++++++++++++++++
 regress/roff/nr/undef.out_ascii | 21 +++++++++++++++++++++
 3 files changed, 46 insertions(+), 1 deletion(-)
 create mode 100644 regress/roff/nr/undef.in
 create mode 100644 regress/roff/nr/undef.out_ascii

(limited to 'regress/roff/nr')

diff --git a/regress/roff/nr/Makefile b/regress/roff/nr/Makefile
index 8da68878..b3ba8102 100644
--- a/regress/roff/nr/Makefile
+++ b/regress/roff/nr/Makefile
@@ -1,6 +1,6 @@
 # $OpenBSD: Makefile,v 1.9 2015/01/23 00:38:43 schwarze Exp $
 
-REGRESS_TARGETS = argc divzero eval escname int predef rr scale
+REGRESS_TARGETS = argc divzero escname eval int predef rr scale undef
 LINT_TARGETS	= divzero escname
 
 .include <bsd.regress.mk>
diff --git a/regress/roff/nr/undef.in b/regress/roff/nr/undef.in
new file mode 100644
index 00000000..fd6000cb
--- /dev/null
+++ b/regress/roff/nr/undef.in
@@ -0,0 +1,24 @@
+.\" $OpenBSD: divzero.in,v 1.3 2017/07/04 14:53:27 schwarze Exp $
+.TH NR-UNDEF 1 "April 9, 2018"
+.SH NAME
+nr-undef \- using an undefined number register
+.SH DESCRIPTION
+The myr register is initially
+.ie rmyr defined.
+.el undefined.
+.PP
+Its initial value is \n[myr].
+.PP
+After interpolating it, is is now
+.ie rmyr defined.
+.el undefined.
+.PP
+.nr myr 1
+After defining it to \n[myr], it is of course still
+.ie rmyr defined.
+.el undefined.
+.PP
+.rr myr
+After removing it, it is again
+.ie rmyr defined.
+.el undefined.
diff --git a/regress/roff/nr/undef.out_ascii b/regress/roff/nr/undef.out_ascii
new file mode 100644
index 00000000..e7649eca
--- /dev/null
+++ b/regress/roff/nr/undef.out_ascii
@@ -0,0 +1,21 @@
+NR-UNDEF(1)                 General Commands Manual                NR-UNDEF(1)
+
+
+
+NNAAMMEE
+       nr-undef - using an undefined number register
+
+DDEESSCCRRIIPPTTIIOONN
+       The myr register is initially undefined.
+
+       Its initial value is 0.
+
+       After interpolating it, is is now defined.
+
+       After defining it to 1, it is of course still defined.
+
+       After removing it, it is again undefined.
+
+
+
+OpenBSD                          April 9, 2018                     NR-UNDEF(1)
-- 
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