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

["nszabolcs at gmail dot com" <sourceware-bugzilla at sourceware dot org>]

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

            Bug ID: 18246
           Summary: scanf "%2d" can incorrectly parse "0x" same for "%2f"
                    with "1e"
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
          Assignee: unassigned at sourceware dot org
          Reporter: nszabolcs at gmail dot com
                CC: drepper.fsp at gmail dot com

BZ #1765 was closed with won't fix, 0x is another similar corner case.

0x prefix should not be parsed as a valid decimal number.

following code prints:
got 1 fields (x=0), expected 0
got 1 fields (y=1), expected 0


#include <stdio.h>
int main()
{
int x;
float y;
int r;

r = sscanf("0x12", "%2d", &x);
if (r != 0)
        printf("got %d fields (x=%d), expected 0\n", r, x);

r = sscanf("1e12", "%2f", &y);
if (r != 0)
        printf("got %d fields (y=%g), expected 0\n", r, y);
}

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