Update of bug #64300 (group groff):
Status: Need Info => Confirmed
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Follow-up Comment #6:
I think we should just ignore an `sp` request when we're off the page;
equivalently, when the value of the `nl` register is `-1`.
No GNU _troff_ request *apart* from `sp` that has distinct no-break control
character semantics advances onto the page when invoked thus.
$ for req in br brp ce cf fi fl in nf rj sp; do echo '***' $req; printf
"'%s\n.pnr nl\n" "$req" | ~/groff-HEAD/bin/groff -Z; done
*** br
nl -1 +0 0
*** brp
nl -1 +0 0
*** ce
nl -1 +0 0
*** cf
nl -1 +0 0
*** fi
nl -1 +0 0
*** fl
nl -1 +0 0
*** in
nl -1 +0 0
*** nf
nl -1 +0 0
*** rj
nl -1 +0 0
*** sp
x T ps
x res 72000 1 1
x init
p1
nl 0 +0 0
x trailer
V792000
x stop
Even supplying an argument to the request, giving it more meat to chew,
changes nothing.
$ for req in br brp ce cf fi fl in nf rj sp; do echo '***' $req; printf "'%s
1\n.pnr nl\n" "$req" | ~/groff-HEAD/bin/groff -Z; done
*** br
nl -1 +0 0
*** brp
nl -1 +0 0
*** ce
nl -1 +0 0
*** cf
troff:<standard input>:1: error: file throughput request is not allowed in
safer mode
nl -1 +0 0
*** fi
nl -1 +0 0
*** fl
nl -1 +0 0
*** in
nl -1 +0 0
*** nf
nl -1 +0 0
*** rj
nl -1 +0 0
*** sp
x T ps
x res 72000 1 1
x init
p1
nl 0 +0 0
x trailer
V792000
x stop
(`cf`'s squawk can be ignored; unlike the others that accept an argument, its
argument is not a measurement or count.)
We can have `sp` throw a warning if it's called with the no-break control
character when the drawing position is not on the page. If I can't find a
warning category that fits well, I'll make it an error.
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