Implement the roff .break request (break out of a .while loop).

Jan Stary <hans at stare dot cz> found it in an ancient groffer(1)
manual page (version 1.19) on MacOS X Mojave.
Having .break not implemented wasn't a particularly bright idea
because obviously, it tended to cause infinite loops.

1 files changed, 16 insertions, 0 deletions

diff --git a/regress/usr.bin/mandoc/roff/while/break.in b/regress/usr.bin/mandoc/roff/while/break.in
new file mode 100644
index 00000000000..11e7d2f5e99
--- /dev/null
+++ b/regress/usr.bin/mandoc/roff/while/break.in
@@ -0,0 +1,16 @@
+.\" $OpenBSD: break.in,v 1.1 2019/04/21 22:43:00 schwarze Exp $
+.Dd $Mdocdate: April 21 2019 $
+.Dt WHILE-BREAK 1
+.Os
+.Sh NAME
+.Nm while-break
+.Nd break request inside a while loop
+.Sh DESCRIPTION
+initial text
+.nr cnt 11 1
+.while n \{\
+\n-[cnt]
+.if !\n[cnt] .break
+\(en
+.\}
+final text