Date: Thu, 7 Aug 2003 17:32:34 +0200 (MET DST)
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From: Martin Stromberg <eplmst AT epl DOT ericsson DOT se>
Message-Id: <200308071532.RAA17010@lws256.lu.erisoft.se>
To: djgpp-workers AT delorie DOT com
Subject: (fwd) Re: sscanf's return value
Newsgroups: comp.std.c
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Reply-To: djgpp-workers AT delorie DOT com

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From: Dan DOT Pop AT cern DOT ch (Dan Pop)
Newsgroups: comp.std.c
Subject: Re: sscanf's return value
Date: 4 Aug 2003 12:02:18 GMT
Organization: DESY Zeuthen
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In <Pine DOT LNX DOT 4 DOT 55L-032 DOT 0307312225220 DOT 25522 AT unix46 DOT andrew DOT cmu DOT edu> "Arthur J. O'Dwyer" <ajo AT andrew DOT cmu DOT edu> writes:


>On Thu, 31 Jul 2003, Stefan Farfeleder wrote:
>>
>> Arthur J. O'Dwyer wrote:
>> > On Thu, 31 Jul 2003, Bruce Wheeler wrote:
>> >> On 31 Jul 2003 11:17:13 GMT, Dan DOT Pop AT cern DOT ch (Dan Pop) wrote:
>> >> >
>> >> >    #include <stdio.h>
>> >> >
>> >> >    int main()
>> >> >    {
>> >> >        int rc = sscanf("123", "%*[0123456789]%*c");
>> >> >        printf("%d\n", rc);
>> >> >        return 0;
>> >> >    }
>>
>> > gcc, presumably the compiler Dan used too, reports -1 and 1.
>> > I hadn't thought to try the second case when I posted in c.l.c,
>> > so now I agree that gcc's implementation must be broken, although
>> > I'm still not sure what the "right" answers should be.
>>
>> GCC alone is not a complete C implementation, it needs your system's C
>> library which seems to be broken.
>>
>>     $ uname -rs
>>     FreeBSD 5.1-CURRENT
>
> % uname -rs
> Linux 2.4.21
>
>Thanks for the correction.  I must have been extra clueless today,
>because I see DJGPP produces the right answers (0 and 1) - which
>means I must've only tested the code on the Linux implementation.
>... I wonder how one would go about rectifying such a thing...

OTOH, DJGPP will output 0 even if the input string is "" in the code
quoted above.  So, DJGPP's sscanf is broken, too, just in a different
way :-)

Dan
-- 
Dan Pop
DESY Zeuthen, RZ group
Email: Dan DOT Pop AT ifh DOT de