From:	nxk3 AT dante DOT student DOT cwru DOT edu (Natarajan Krishnaswami)
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: ISO "C" violation.
Date:	9 Feb 1997 14:43:32 GMT
Organization:	Case Western Reserve University, Cleveland OH (USA)
Lines:	37
Message-ID:	<slrn5froki.7de.nxk3@dante.student.cwru.edu>
References:	<19970208 DOT 183318 DOT 4231 DOT 0 DOT stodmaster AT juno DOT com>
Reply-To:	nxk3 AT dante DOT cwru DOT edu
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To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

On Sat, 8 Feb 1997 23:34:41 GMT, Joshua M Beall <stodmaster AT juno DOT com> wrote:
> I have DJGPP for the IBM PC, and have noted that fscanf returns
> NULL, however, I cannot find a single ISO "C" reference book that
> indicates it should do so.

Perhaps one should not say NULL (i.e., (void*)0) but (int)0.
 
(From linux fscanf(3) man page)
       These functions return the number of input items assigned,
       which can be fewer than provided for, or even zero, in the
       event  of  a matching failure.  Zero indicates that, while
       there was input available, no conversions  were  assigned;
       typically  this is due to an invalid input character, such
       as an alphabetic character for  a  `%d'  conversion.   The
       value  EOF  is  returned if an input failure occurs before
       any conversion such as an end-of-file occurs. If an  error
       or end-of-file occurs after conversion has begun, the num-
       ber of conversions which were  successfully  completed  is
       returned.

(From 'fprintf.c' from DJGPP library source)
  return ferror(iop) ? EOF : len;


This appears to be analogous.  EOF is returned if there is an error on
reading input, otherwise, a length is returned.  Linux fprintf claims
ANSI C3.159-1989 conformance with this behaviour, so I would surmise
that djgpp's fprintf is also conformant.


TTYL,
N.
-==(UDIC)==-
"Als Gregor Samsa eines Morgens aus unruhigen Träumen erwachte, fand
er sich in seinem Bett zu einem ungeheueren Ungeziefer verwandelt."
		-Franz Kafka, "Die Verwandlung"

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