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/* 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;
}
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