challenge response prototcol question

[marc spitzer]

I am writting a tcl memcached client, more as an exersize then anything else,
and I have a question about how to handle the protocol memcached uses, here
is an example:

set aaa $flag $expire $size\r\n
if the above is properly formated it waits for $size bytes followed by a \r\n
if there is a problem it gives an error code.

What is the best way to handle this?

Thanks,

marc
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