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NNTP-Posting-Date: Thu, 01 Sep 2011 18:39:12 -0500
Message-ID: <4E6017A1.4170@mindspring.com>
Date: Thu, 01 Sep 2011 19:39:13 -0400
From: pete <pfiland@mindspring.com>
Reply-To: pfiland@mindspring.com
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Subject: Re: I think this is an impossible assignment...could you help?
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Xref: x330-a1.tempe.blueboxinc.net comp.lang.c:9853

Joe Pfeiffer wrote:
> 
> Keith Thompson <kst-u@mib.org> writes:
> 
> > Joe Pfeiffer <pfeiffer@cs.nmsu.edu> writes:
> >> James Kuyper <jameskuyper@verizon.net> writes:
> > [...]
> >>> scanf() doesn't happen to be one of those functions; the required
> >>> behavior for scanf() can be implemented entirely in C code that calls
> >>> other C standard library functions, without using any of the other
> >>> members of the scanf() family. But if your argument were valid, it would
> >>> also apply to fgetc().
> >>
> >> Actually, I was unaware that fgetc() had any non-C code in it -- what
> >> does it do that requires assembler?
> >
> > fgetc() cannot be written in *portable* C.
> 
> What in it requires non-portable C?

This doesn't exactly answer your question,
but getc and fgetc are very close in what they do.

There is some chance that if getc 
is implemented on you machine as a macro,
that you can use the following program
to see how the implementation that you are using,
implements getc.

/* BEGIN new.c */

#include <stdio.h>

#define str(x)  # x
#define xstr(x) str(x)

int 
main(void)
{
    puts(xstr(getc(stdin)));
    return 0;
}

/* END new.c */


-- 
pete