mirror of
https://github.com/python/cpython
synced 2024-09-06 02:28:59 +00:00
28 lines
428 B
C
28 lines
428 B
C
/* Portable fmod(x, y) implementation for systems that don't have it */
|
|
|
|
#include <math.h>
|
|
#include <errno.h>
|
|
|
|
extern int errno;
|
|
|
|
double
|
|
fmod(x, y)
|
|
double x, y;
|
|
{
|
|
double i, f;
|
|
|
|
if (y == 0.0) {
|
|
errno = EDOM;
|
|
return 0.0;
|
|
}
|
|
|
|
/* return f such that x = i*y + f for some integer i
|
|
such that |f| < |y| and f has the same sign as x */
|
|
|
|
i = floor(x/y);
|
|
f = x - i*y;
|
|
if ((x < 0.0) != (y < 0.0))
|
|
f = f-y;
|
|
return f;
|
|
}
|