bug in sscanf()?

Allan, Bruce W
2014-01-09T18:58:00Z

The kernel version of sscanf() does not allow for scanning a string with multiple concatenated integers even when maximum field widths are specified to stop reading the string to delineate the individual integers. For example, trying to read the (3) 32-bit hexadecimal integers deadbeef, 12345678 and deadc0de when provided as a concatenated string with:

int num;
u32 i, j, k;

num = sscanf("deadbeef12345678deadc0de", "%8x%8x%8x", &i, &j, &k);

will return the number of input items successfully matched and assigned as 3, the 32-bit integers j and k will have the expected values, but i will be 0.

The libc version of sscanf(), however, will set the value of i to deadbeef.

Should this be expected with the kernel version or is it a bug?

Thanks,
Bruce.