From: rog@vitanuova.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] experimental change for devmnt to deal with spaces
Date: Wed, 3 Jul 2002 22:38:24 +0100 [thread overview]
Message-ID: <20020703213236.7E3AD19A0D@mail.cse.psu.edu> (raw)
> What's the problem? Any of you must be aware of something I'm missing.
to continue with the upas/fs example, here's a function that opens a
mailbox and returns a pathname that can be used to access the messages
therein:
void
openmbox(char *path, char *name, char result[])
{
fprint(open("/mail/fs/ctl", OWRITE), "open %q %q", path, name);
sprint(result, "/mail/fs/%s", name);
}
imagine the function being called as follows:
{
char buf[65536];
openmbox("/mail/box/rog/mbox", "My\x00A0Mailbox", buf);
}
assuming upas/fs doesn't do the same character translation as the
mount driver, any subsequent code that tries to use the returned path
will fail, as the mailbox will have been created in upas/fs's internal
data structures *with* the 0xa0 character; however the mount driver
prevents that character from getting through.
to my mind, the fact that a pure plan 9 program has to be aware of
this convention to work correctly seems to indicate that the best
solution is at the boundaries of the system - i.e. whereever a plan 9
fileserver interacts with an external name.
that keeps internal invariants simple, and the potential for peril low.
rog.
next reply other threads:[~2002-07-03 21:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-07-03 21:38 rog [this message]
-- strict thread matches above, loose matches on Subject: below --
2002-07-03 17:52 rog
2002-07-03 20:37 ` FJ Ballesteros
2002-07-03 12:40 Fco.J.Ballesteros
2002-07-03 19:43 ` rob pike, esq.
2002-07-03 14:45 ` Lucio De Re
2002-07-03 15:42 ` FJ Ballesteros
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