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Date: Sat, 20 Jul 2013 11:31:05 +0300
From: Eli Zaretskii <eliz AT gnu DOT org>
Subject: Re: Set _IOERR if the file stream has been opened in wrong mode.
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> From: "Stephen J. Turnbull" <turnbull AT sk DOT tsukuba DOT ac DOT jp>
> Date: Sat, 20 Jul 2013 17:20:25 +0900
> 
> I would assume that
> 
>     ifp = fopen(infile, "r"); ofp = fopen(outfile, "w");
> 
> produces an unwritable and an unreadable file respectively

There's no such thing as "unreadable file" on DOS.  As for "unwritable
file", fopen(..., "r") does not create a file, so it cannot change the
file's attributes.