Re: [PATCH] Speeding up FAT operations
H. Peter Anvin (hpa@transmeta.com)
23 Sep 1998 22:52:18 GMT
Followup to: <Pine.LNX.3.95.980923084335.832D-100000@chaos.analogic.com>
By author: "Richard B. Johnson" <root@chaos.analogic.com>
In newsgroup: linux.dev.kernel
>
> > This may not mean much, but two years ago when I first started learning a
> > computer I was learning QBASIC. And I read a post somewhere of an error in
> > QBASIC that would allow you to make a space in the name that no other program
> > could read except another QBASIC program that opened it the same way. It was
> > something like the following... (I haven't touched it for over a year and a
> > half so it may not be completely accurate)
> >
> > open "blah hi" as binary #1 (or something like this)
> > print #1, "jkfsdjlkfsdjkl"
> > close #1
> >
> > Then you can open "blah hi" with the QBASIC program again.
> >
> > The system never reported it as an error or anything, and it would show up as
> > a valid file when you did a DIR. In fact, when you got a directory listing,
> > it would show it with the space.
> >
>
> Yes. A DOS File-System emulator cannot assume that DOS file-names are
> all in upper case. It also can't assume that it contains "valid"
> characters. DOS File names are not supposed to contain '.', ' ', etc.,
> but they can.
>
Hang on! That's a different thing -- you can't create those files
with DOS system calls. Space *IS* a legal character in DOS filenames
-- the system calls will happily accept it, although the shell won't
(although it will match it against ?).
-hpa
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