38 lines
762 B
C
38 lines
762 B
C
/**
|
|
* This file has no copyright assigned and is placed in the Public Domain.
|
|
* This file is part of the mingw-w64 runtime package.
|
|
* No warranty is given; refer to the file DISCLAIMER.PD within this package.
|
|
*/
|
|
#include <math.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
|
|
long
|
|
lround (double x)
|
|
{
|
|
double res;
|
|
|
|
if (x >= 0.0)
|
|
{
|
|
res = ceil (x);
|
|
if (res - x > 0.5)
|
|
res -= 1.0;
|
|
}
|
|
else
|
|
{
|
|
res = ceil (-x);
|
|
if (res + x > 0.5)
|
|
res -= 1.0;
|
|
res = -res;
|
|
}
|
|
if (!isfinite (res)
|
|
|| res > (double) LONG_MAX
|
|
|| res < (double) LONG_MIN)
|
|
{
|
|
errno = ERANGE;
|
|
/* Undefined behaviour, so we could return anything. */
|
|
/* return res > 0.0 ? LONG_MAX : LONG_MIN; */
|
|
}
|
|
return (long) res;
|
|
}
|