Mail Archives: djgpp/2004/09/02/15:15:12.1
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Message-ID: | <41376655.2A1807EC@yahoo.com>
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From: | CBFalconer <cbfalconer AT yahoo DOT com>
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Organization: | Ched Research
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Newsgroups: | comp.os.msdos.djgpp
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Subject: | Re: scanf: strange behavior?
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References: | <20040902144152 DOT GH6858 AT webhome DOT cz>
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Lines: | 44
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Date: | Thu, 02 Sep 2004 19:08:36 GMT
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To: | djgpp AT delorie DOT com
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DJ-Gateway: | from newsgroup comp.os.msdos.djgpp
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Reply-To: | djgpp AT delorie DOT com
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Egon Eckert wrote:
>
> compiling and running this code:
>
> #include <stdio.h>
>
> int main(int, const char**)
> {
> char c[2];
> printf("%d\n", sscanf("A", "%c%c", c, c + 1));
> return 0;
> }
>
> gives:
>
> 1 in GNU libc (on Linux)
> 1 in Borland C++ 3.1 (on DOS)
> -1 in djgpp
>
> It's conformant with the docs: "If input ends, or if there is any
> input failure before the first item is converted and assigned, `EOF'
> is returned.", so it's not to be called a 'bug', but...
>
> Do you think it's a standard violation, or just a "difference",
> ie. behavior not specified by POSIX, ANSI or other (involved)
> authority?
I think DJGPP is correct in returning EOF, because the string ends
before the scan is complete. The only authority is the C
standard. I would consider it a library bug on Borland and your
particular Linux installation of libc. This is better suited to
comp.lang.c.
At least all three signalled a failure.
--
Some useful references:
<http://www.ungerhu.com/jxh/clc.welcome.txt>
<http://www.eskimo.com/~scs/C-faq/top.html>
<http://benpfaff.org/writings/clc/off-topic.html>
<http://anubis.dkuug.dk/jtc1/sc22/wg14/www/docs/n869/> (C99)
<http://www.dinkumware.com/refxc.html> C-library
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