Hi Erwin,
> > The problem is, that it seems that sscanf doesn't check the
> > range of the var to which the digits should be converted.
> >
> > [...]
> >
> > In the first case, sscanf doesn't work fine. The problem is, that
> > th
> > maximum integer is 0xffffffff whis is 4294967295. So, my input is
> > bigger than the maximum value.
> > I thought, that in this case, sscanf should set the &ouput
> > to INFINITY. Or, at least, it should return 0. But it looks like
> > sscanf
> > just returns a meaningless value.
>
> why don't you like the idea that I suggested a while ago to set errno=0
> before calling sscanf and check the value of errno afterwards?
I'm sorry, but i think that I have not been clear enough that while ago.
You're idea didn't work. I set errno=0 and after the call to sscanf it is
still set to 0.
Here's my example:
unsigned int output;
char input1[] = "9999999999\0";
char input2[] = "999999999\0";
errno=0;
if (sscanf(input1, "%d", &output) != 1)
{
printf("sscanf returned an error for input 1\n");
exit(0);
}
printf("we read %d for input 1 with errno %d\n", output, errno);
if (sscanf(input2, "%d", &output) != 1)
{
printf("sscanf returned an error for input 2\n");
exit(0);
}
printf("we read %d for input 2 with errno %d\n", output, errno);
exit(0);
And the output is:
we read 1410065407 for input 1 with errno 0
we read 999999999 for input 2 with errno 0
What sscanf SHOULD do is: Set the errno to something like
"number out of range" AND to return 0 to indicate the error.
In the uClibc list somebody ment to remeber, that this has been an
error some time ago. So what I should try is to take a newer uClibc
to check if the error is still there. So my next question is:
Has somebody ever tried to integrate a newer uClibc inside uClinux?
Cheers,
Mathias
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