ietf-nntp Where did 497 come from for the max arg length?

[Clive D.W. Feather]

Stan O. Barber said:
> Overall line length is 512 (per RFC 977). Each line is terminated with CRLF,
> that leaves
> 510.

Right.

> RFC977 didn't set a max keyword length, but the longest one I could find in use
> was 12
> characters. So, the text says:
> 
> "Keywords MUST be at least three US-ASCII characters and MUST NOT exceed 12
> US-ASCII characters."

Also okay.

> 509 - 12 = 497

No, lost me.

PAT is 3 characters. So in theory the arguments could be 506 characters
long if it were not for this 497 limit. So, is there an actual reason for
the 497, or is the only logic your calculation up there ? If the latter,
then this wording should go - people can rely on the 512 limit and work
from there.

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