- rename `r' to `code' - defer the buf_drain() call With libevent we had to free() the header string, whereas buf_getdelim() returns a string from the buffer itself, so we can safely defer the drain operation after the sanity checks.

a parse routine shouldn't interfere with the handling of the events; pulling this into the caller makes the logic simpler to follow.

Now that we're using also some bits from libcrypto, it's important to not mix different libcrypto/ssl implementation in the same program. This check is taken from OpenSMTPD. May have helped with https://github.com/macports/macports-ports/pull/23007

will help simplifying a bit in net.c, and it's generally useful.