When I wanted to append an ordinary C string to a BinarySink, without
any prefix length field or suffix terminator, I was using the idiom
put_datapl(bs, ptrlen_from_asciz(string));
but I've finally decided that's too cumbersome, and it deserves a
shorter name. put_dataz(bs, string) now does the same thing - in fact
it's a macro expanding to exactly the above.
While I'm at it, I've also added put_datalit(), which is the same
except that it expects a C string literal (and will enforce that at
compile time, via PTRLEN_LITERAL which it calls in turn). You can use
that where possible to avoid the run-time cost of the strlen.
cc6d3591ad