table of contents
| BITMAP_ORD_TO_POS(9) | Basic Kernel Library Functions | BITMAP_ORD_TO_POS(9) |
NAME¶
bitmap_ord_to_pos - find position of n-th set bit in bitmap
SYNOPSIS¶
int bitmap_ord_to_pos(const unsigned long * buf, int ord, int bits);
ARGUMENTS¶
buf
pointer to bitmap
ord
ordinal bit position (n-th set bit, n >= 0)
bits
number of valid bit positions in buf
DESCRIPTION¶
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.
COPYRIGHT¶
| June 2024 | Kernel Hackers Manual 3.10 |