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().

1 files changed, 15 insertions, 0 deletions

diff --git a/regress/roff/return/basic.out_ascii b/regress/roff/return/basic.out_ascii
new file mode 100644
index 00000000..25f66744
--- /dev/null
+++ b/regress/roff/return/basic.out_ascii
@@ -0,0 +1,15 @@
+RETURN-BASIC(1)             General Commands Manual            RETURN-BASIC(1)
+
+NNAAMMEE
+     rreettuurrnn--bbaassiicc - the return request
+
+DDEESSCCRRIIPPTTIIOONN
+     return before macro
+
+     text from macro (1 argument: "myarg"), 0 arguments after return: "",
+
+     return after macro
+
+     final text
+
+OpenBSD                         August 23, 2018                        OpenBSD