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* If a .shift request has a negative argument, do not use a negative arrayIngo Schwarze2022-04-243-6/+13
| | | | | | | | index but use 0 instead of the argument, just like groff. Warn about the invalid argument. While here, fix the column number in another warning message. Segfault reported by tb@, found with afl(1).
* delete the two pairs of extra blank lines from expected man(7) terminalIngo Schwarze2021-06-282-8/+0
| | | | output that are no longer printed since man_term.c rev. 1.236
* Implement the roff(7) .shift and .return requests,Ingo Schwarze2018-08-236-0/+128
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().