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, 25 insertions, 0 deletions

diff --git a/regress/roff/shift/bad.out_ascii b/regress/roff/shift/bad.out_ascii
new file mode 100644
index 00000000..0b21f574
--- /dev/null
+++ b/regress/roff/shift/bad.out_ascii
@@ -0,0 +1,25 @@
+SHIFT_BAD(1)                General Commands Manual               SHIFT_BAD(1)
+
+
+
+NNAAMMEE
+       sshhiifftt--bbaadd - wrong usage of macro arguments
+
+DDEESSCCRRIIPPTTIIOONN
+       initial text
+
+       argument used before call: ""
+
+       in macro: "argument"
+
+       invalid argument number 'x': ""
+
+       argument used after call: ""
+
+       after shift badarg: "arg2" after excessive shift: 0 ""
+
+       final text
+
+
+
+OpenBSD                         August 23, 2018                   SHIFT_BAD(1)