bitmap_ord_to_pos — find position of n-th set bit in bitmap
int bitmap_ord_to_pos ( | const unsigned long * buf, |
| int ord, | |
int bits); |
bufpointer to bitmap
ordordinal bit position (n-th set bit, n >= 0)
bits
number of valid bit positions in buf
Map the ordinal offset of bit ord in buf to its position in buf.
Value of ord should be in range 0 <= ord < weight(buf), else
results are undefined.
If for example, just bits 4 through 7 are set in buf, then ord
values 0 through 3 will get mapped to 4 through 7, respectively,
and all other ord values return undefined values. When ord value 3
gets mapped to (returns) pos value 7 in this example, that means
that the 3rd set bit (starting with 0th) is at position 7 in buf.
The bit positions 0 through bits are valid positions in buf.