| #ifndef _LINUX_HELPER_MACROS_H_ |
| #define _LINUX_HELPER_MACROS_H_ |
| #define __find_closest(x, a, as, op) \ |
| typeof(as) __fc_i, __fc_as = (as) - 1; \ |
| typeof(x) __fc_x = (x); \ |
| typeof(*a) const *__fc_a = (a); \ |
| for (__fc_i = 0; __fc_i < __fc_as; __fc_i++) { \ |
| if (__fc_x op DIV_ROUND_CLOSEST(__fc_a[__fc_i] + \ |
| __fc_a[__fc_i + 1], 2)) \ |
| * find_closest - locate the closest element in a sorted array |
| * @x: The reference value. |
| * @a: The array in which to look for the closest element. Must be sorted |
| * Returns the index of the element closest to 'x'. |
| #define find_closest(x, a, as) __find_closest(x, a, as, <=) |
| * find_closest_descending - locate the closest element in a sorted array |
| * @x: The reference value. |
| * @a: The array in which to look for the closest element. Must be sorted |
| * Similar to find_closest() but 'a' is expected to be sorted in descending |
| #define find_closest_descending(x, a, as) __find_closest(x, a, as, >=) |