41 lines
882 B
C
41 lines
882 B
C
/*
|
|
* This file is part of the UCB release of Plan 9. It is subject to the license
|
|
* terms in the LICENSE file found in the top-level directory of this
|
|
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
|
|
* part of the UCB release of Plan 9, including this file, may be copied,
|
|
* modified, propagated, or distributed except according to the terms contained
|
|
* in the LICENSE file.
|
|
*/
|
|
|
|
#include <u.h>
|
|
#include <libc.h>
|
|
|
|
/*
|
|
* floating-point mod function without infinity or NaN checking
|
|
*/
|
|
double
|
|
jehanne_fmod(double x, double y)
|
|
{
|
|
int sign, yexp, rexp;
|
|
double r, yfr, rfr;
|
|
|
|
if (y == 0)
|
|
return x;
|
|
if (y < 0)
|
|
y = -y;
|
|
yfr = jehanne_frexp(y, &yexp);
|
|
sign = 0;
|
|
if(x < 0) {
|
|
r = -x;
|
|
sign++;
|
|
} else
|
|
r = x;
|
|
while(r >= y) {
|
|
rfr = jehanne_frexp(r, &rexp);
|
|
r -= jehanne_ldexp(y, rexp - yexp - (rfr < yfr));
|
|
}
|
|
if(sign)
|
|
r = -r;
|
|
return r;
|
|
}
|