The .AT, .DT, and .UC macros are allowed inside next-line scope

and never produce output at the place of their invocation.

Minibugs found while investigating unrelated afl(1) reports from tb@.

3 files changed, 48 insertions, 0 deletions

diff --git a/regress/man/DT/Makefile b/regress/man/DT/Makefile
new file mode 100644
index 00000000..44cf0519
--- /dev/null
+++ b/regress/man/DT/Makefile
@@ -0,0 +1,5 @@
+# $OpenBSD: Makefile,v 1.1 2022/04/27 17:04:15 schwarze Exp $
+
+REGRESS_TARGETS	 = basic
+
+.include <bsd.regress.mk>
diff --git a/regress/man/DT/basic.in b/regress/man/DT/basic.in
new file mode 100644
index 00000000..8902e594
--- /dev/null
+++ b/regress/man/DT/basic.in
@@ -0,0 +1,22 @@
+.\" $OpenBSD: basic.in,v 1.1 2022/04/27 17:04:15 schwarze Exp $
+.TH DT-BASIC 1 "April 27, 2022"
+.SH NAME
+DT-basic \- restore the default tabulator positions
+.SH DESCRIPTION
+.nf
+Default tabs are every five columns:
+1234 1234 1234 1234 1234
+one	two	three	four
+.PP
+Custom tabs: column 6, then every 8 columns:
+12345 1234567 1234567 1234567
+.ta 6n T 8n
+one	two	three	four
+.PP
+.B
+.DT
+bold text
+.PP
+Back to the default:
+1234 1234 1234 1234 1234
+one	two	three	four
diff --git a/regress/man/DT/basic.out_ascii b/regress/man/DT/basic.out_ascii
new file mode 100644
index 00000000..8ccbc685
--- /dev/null
+++ b/regress/man/DT/basic.out_ascii
@@ -0,0 +1,21 @@
+DT-BASIC(1)                 General Commands Manual                DT-BASIC(1)
+
+NNAAMMEE
+       DT-basic - restore the default tabulator positions
+
+DDEESSCCRRIIPPTTIIOONN
+       Default tabs are every five columns:
+       1234 1234 1234 1234 1234
+       one  two  three     four
+
+       Custom tabs: column 6, then every 8 columns:
+       12345 1234567 1234567 1234567
+       one   two     three   four
+
+       bboolldd tteexxtt
+
+       Back to the default:
+       1234 1234 1234 1234 1234
+       one  two  three     four
+
+OpenBSD                         April 27, 2022                     DT-BASIC(1)