SUSv3 who for Busybox

[Vladimir Dronnikov]

Hello, Walter!

Want to share some experience.

> i did no bloatcheck against the old who since they are not comparable.

At least what
# (cd coreutils; ../scripts/objsizes | grep who)
gives? How many bytes? That would be the "0" point.

Then consider replacing excessive use of option_mask32 with a local
unsigned opt (which can be optimized to be register).

Then consider replacing numerous printf()s with string concatenation
and less printf()s. The rationale if that printf() uses varargs which
implies excessive code size.

Best regards,
--
Vladimir