| #include <math.h> | |
| #include <limits.h> | |
| #include <errno.h> | |
| long | |
| lround (double x) | |
| { | |
| /* Add +/- 0.5 then then round towards zero. */ | |
| double tmp = trunc (x + (x >= 0.0 ? 0.5 : -0.5)); | |
| if (!isfinite (tmp) | |
| || tmp > (double)LONG_MAX | |
| || tmp < (double)LONG_MIN) | |
| { | |
| errno = ERANGE; | |
| /* Undefined behaviour, so we could return anything. */ | |
| /* return tmp > 0.0 ? LONG_MAX : LONG_MIN; */ | |
| } | |
| return (long)tmp; | |
| } |