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Date:      Thu, 8 May 2008 18:47:26 +0200
From:      Joerg Sonnenberger <joerg@britannica.bec.de>
To:        cvs-src@freebsd.org
Subject:   Re: cvs commit: src/include stdio.h src/lib/libc/stdio clrerr.c feof.c ferror.c fileno.c getc.c getchar.c local.h putc.c putchar.c xprintf.c
Message-ID:  <20080508164726.GA2596@britannica.bec.de>
In-Reply-To: <alpine.LSU.1.00.0805081717111.8138@hermes-1.csi.cam.ac.uk>
References:  <200805051603.m45G3rrN089219@repoman.freebsd.org> <200805051637.43073.jhb@freebsd.org> <20080507064013.GU32532@elvis.mu.org> <200805071111.39938.jhb@freebsd.org> <20080507231444.GF32532@elvis.mu.org> <18466.22969.506620.244442@hergotha.csail.mit.edu> <alpine.LSU.1.00.0805081717111.8138@hermes-1.csi.cam.ac.uk>

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On Thu, May 08, 2008 at 05:18:23PM +0100, Tony Finch wrote:
> On Wed, 7 May 2008, Garrett Wollman wrote:
> >
> > I like the idea of making FILE opaque
> 
> The C standard requires that FILE is an object type which means that it
> must not be opaque. (Opaque structures are incomplete types, which are
> not object types.)

The C standard is also quite explicit that anything but sizeof(FILE) is
implementation defined. I have not found a single reason why
sizeof(FILE) should be valid. I believe that is not intended by the
standard.

Joerg



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