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From: Charles Forsyth <forsyth@ter...>
Subject: ftpfs ahould not expose "." and ".." directories
Date: Mon, 28 Apr 2008 11:50:14 +0100

just for completeness, in plan 9 code it also would be
	if(strcmp(".", field[8]) == 0 ...)
etc. not `!strcmp', and indeed it is that way elsewhere in ip/ftpfs.c
similarly, it is usually
	if(p != nil)
		...
not
	if(!p)

there are other guidelines in style(6)