[Bug stdio/18246] scanf "%2d" can incorrectly parse "0x" same for "%2f" with "1e"

["wbrad.vt at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18246

will bradshaw <wbrad.vt at gmail dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |wbrad.vt at gmail dot com

--- Comment #3 from will bradshaw <wbrad.vt at gmail dot com> ---
what is the appropriate result for:

#include <stdio.h>
int main()
{
int x,z;
int r;
char c;

r = sscanf("0x12", "%2i%c%d", &x,&c,&z);
        printf("got %d fields (x=%d,c=%c,z=%d)\n", r,x,c,z);
}

i get:

got 3 fields (x=0,c=1,z=2)

I believe I should get:

got 3 fields (x=0,c=x,z=12)

but I think the answer may also be to get 0 fields. I'm really not sure. I need
input from someone intimately familiar with scanf semantics.

Additionally it does not appear that float parsing follows width specifiers for
parsing of NaN inf or infinity. If someone has a careful definition of scanf
semantics that would also be appreciated.

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