From c56c17992552256b55134ead16c3e16164fd2e67 Mon Sep 17 00:00:00 2001
From: Ingo Schwarze <schwarze@openbsd.org>
Date: Thu, 23 Aug 2018 14:29:38 +0000
Subject: Implement the roff(7) .shift and .return requests, for example used
 by groff_hdtbl(7) and groff_mom(7).

Also correctly interpolate arguments during nested macro execution
even after .shift and .return, implemented using a stack of argument
arrays.

Note that only read.c, but not roff.c can detect the end of a macro
execution, and the existence of .shift implies that arguments cannot
be interpolated up front, so unfortunately, this includes a partial
revert of roff.c rev. 1.337, moving argument interpolation back into
the function roff_res().
---
 regress/roff/shift/bad.in | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 regress/roff/shift/bad.in

(limited to 'regress/roff/shift/bad.in')

diff --git a/regress/roff/shift/bad.in b/regress/roff/shift/bad.in
new file mode 100644
index 00000000..809832de
--- /dev/null
+++ b/regress/roff/shift/bad.in
@@ -0,0 +1,30 @@
+.\" $OpenBSD: bad.in,v 1.1 2018/08/23 14:16:12 schwarze Exp $
+.TH SHIFT_BAD 1 "August 23, 2018"
+.SH NAME
+.B shift-bad
+\(en wrong usage of macro arguments
+.SH DESCRIPTION
+initial text
+.de mym
+in macro: "\\$1"
+.PP
+invalid argument number 'x': "\\$x"
+..
+.PP
+argument used before call: "\$1"
+.shift
+.PP
+.mym argument
+.PP
+argument used after call: "\$1"
+.shift 2
+.PP
+.de mym
+.shift badarg
+after shift badarg: "\\$1"
+.shift 2
+after excessive shift: \\n(.$ "\\$1"
+..
+.mym arg1 arg2
+.PP
+final text
-- 
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