From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Wed, 18 Jun 2014 11:34:42 -0600
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From: andrey mirtchovski <mirtchovski@gmail.com>
To: Fans of the OS Plan 9 from Bell Labs <9fans@9fans.net>
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Subject: Re: [9fans] possible buffer overflow in devcons.c?
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used to be 3 :)

"UTFmax, defined as 3 in <libc.h>, is the maximum number of bytes
required to represent a rune."

http://man.cat-v.org/plan_9/2/rune