diff options
Diffstat (limited to 'src/commonlib/include')
| -rw-r--r-- | src/commonlib/include/commonlib/helpers.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/src/commonlib/include/commonlib/helpers.h b/src/commonlib/include/commonlib/helpers.h index 0318e447d1..1be1fbb709 100644 --- a/src/commonlib/include/commonlib/helpers.h +++ b/src/commonlib/include/commonlib/helpers.h @@ -34,6 +34,22 @@ #define ABS(a) (((a) < 0) ? (-(a)) : (a)) #define CEIL_DIV(a, b) (((a) + (b) - 1) / (b)) #define IS_POWER_OF_2(x) (((x) & ((x) - 1)) == 0) +#define DIV_ROUND_UP(x, y) (((x) + (y) - 1) / (y)) +/* + * Divide positive or negative dividend by positive divisor and round + * to closest integer. Result is undefined for negative divisors and + * for negative dividends if the divisor variable type is unsigned. + */ +#define DIV_ROUND_CLOSEST(x, divisor)( \ +{ \ + typeof(x) __x = x; \ + typeof(divisor) __d = divisor; \ + (((typeof(x))-1) > 0 || \ + ((typeof(divisor))-1) > 0 || (__x) > 0) ? \ + (((__x) + ((__d) / 2)) / (__d)) : \ + (((__x) - ((__d) / 2)) / (__d)); \ +} \ +) /* Standard units. */ #define KiB (1<<10) |