Commit | Line | Data |
---|---|---|
95d11952 BG |
1 | #ifndef _LINUX_HELPER_MACROS_H_ |
2 | #define _LINUX_HELPER_MACROS_H_ | |
3 | ||
4 | #define __find_closest(x, a, as, op) \ | |
5 | ({ \ | |
6 | typeof(as) __fc_i, __fc_as = (as) - 1; \ | |
7 | typeof(x) __fc_x = (x); \ | |
05836c37 | 8 | typeof(*a) const *__fc_a = (a); \ |
95d11952 BG |
9 | for (__fc_i = 0; __fc_i < __fc_as; __fc_i++) { \ |
10 | if (__fc_x op DIV_ROUND_CLOSEST(__fc_a[__fc_i] + \ | |
11 | __fc_a[__fc_i + 1], 2)) \ | |
12 | break; \ | |
13 | } \ | |
14 | (__fc_i); \ | |
15 | }) | |
16 | ||
17 | /** | |
18 | * find_closest - locate the closest element in a sorted array | |
19 | * @x: The reference value. | |
20 | * @a: The array in which to look for the closest element. Must be sorted | |
21 | * in ascending order. | |
22 | * @as: Size of 'a'. | |
23 | * | |
24 | * Returns the index of the element closest to 'x'. | |
25 | */ | |
26 | #define find_closest(x, a, as) __find_closest(x, a, as, <=) | |
27 | ||
28 | /** | |
29 | * find_closest_descending - locate the closest element in a sorted array | |
30 | * @x: The reference value. | |
31 | * @a: The array in which to look for the closest element. Must be sorted | |
32 | * in descending order. | |
33 | * @as: Size of 'a'. | |
34 | * | |
35 | * Similar to find_closest() but 'a' is expected to be sorted in descending | |
36 | * order. | |
37 | */ | |
38 | #define find_closest_descending(x, a, as) __find_closest(x, a, as, >=) | |
39 | ||
40 | #endif |