bit_ffs_area_at
bit_ffs_area_at(bitstr, start, nbits, size, &found);
bit_ffs_area_at(bitstr, start, nbits, size, &found);
bit_ffs_area_at(bitstr, 2, nbits, 3, &location);
bit_ffs_area_at(bitstr, 6, nbits, 3, &location);
bit_ffs_area_at(bitstr, 8, nbits, 3, &location);
bit_ffs_area_at(bitstr, 8, nbits, 3, &location);
bit_ffs_area_at(bitstr, 69, nbits, 3, &location);
bit_ffs_area_at(bitstr, 70, nbits, 3, &location);
bit_ffs_area_at(bitstr, 72, nbits, 3, &location);