tftp/netascii

[guyton%condor at rand-unix.ARPA]

I've added netascii (and many other bug fixes) to the 4.2bsd
tftp user and server code.  Since the conversion to/from
netascii slows the transfer down somewhat, I'm also adding in
a little read-ahead, write-behind logic to try and speed it
back up.

I've not (yet) asked Berkeley if I can just post this code;
so in the meantime I'll send it to anyone that has a 4.2bsd
source license (and sends me a copy of it along with their
network address).

-- Jim Guyton

arpa:   guyton at rand-unix.arpa
uucp:   {decvax, sdcrdcf, vortex}!randvax!guyton
post:   Rand Corporation, 1700 Main Street, Santa Monica, CA 90406