forked from KolibriOS/kolibrios
108 lines
2.3 KiB
C
108 lines
2.3 KiB
C
|
|
||
|
|
/* @(#)w_fmod.c 5.1 93/09/24 */
|
||
|
|
/*
|
||
|
|
* ====================================================
|
||
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
||
|
|
*
|
||
|
|
* Developed at SunPro, a Sun Microsystems, Inc. business.
|
||
|
|
* Permission to use, copy, modify, and distribute this
|
||
|
|
* software is freely granted, provided that this notice
|
||
|
|
* is preserved.
|
||
|
|
* ====================================================
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
FUNCTION
|
||
|
|
<<fmod>>, <<fmodf>>---floating-point remainder (modulo)
|
||
|
|
|
||
|
|
INDEX
|
||
|
|
fmod
|
||
|
|
INDEX
|
||
|
|
fmodf
|
||
|
|
|
||
|
|
ANSI_SYNOPSIS
|
||
|
|
#include <math.h>
|
||
|
|
double fmod(double <[x]>, double <[y]>)
|
||
|
|
float fmodf(float <[x]>, float <[y]>)
|
||
|
|
|
||
|
|
TRAD_SYNOPSIS
|
||
|
|
#include <math.h>
|
||
|
|
double fmod(<[x]>, <[y]>)
|
||
|
|
double (<[x]>, <[y]>);
|
||
|
|
|
||
|
|
float fmodf(<[x]>, <[y]>)
|
||
|
|
float (<[x]>, <[y]>);
|
||
|
|
|
||
|
|
DESCRIPTION
|
||
|
|
The <<fmod>> and <<fmodf>> functions compute the floating-point
|
||
|
|
remainder of <[x]>/<[y]> (<[x]> modulo <[y]>).
|
||
|
|
|
||
|
|
RETURNS
|
||
|
|
The <<fmod>> function returns the value
|
||
|
|
@ifnottex
|
||
|
|
<[x]>-<[i]>*<[y]>,
|
||
|
|
@end ifnottex
|
||
|
|
@tex
|
||
|
|
$x-i\times y$,
|
||
|
|
@end tex
|
||
|
|
for the largest integer <[i]> such that, if <[y]> is nonzero, the
|
||
|
|
result has the same sign as <[x]> and magnitude less than the
|
||
|
|
magnitude of <[y]>.
|
||
|
|
|
||
|
|
<<fmod(<[x]>,0)>> returns NaN, and sets <<errno>> to <<EDOM>>.
|
||
|
|
|
||
|
|
You can modify error treatment for these functions using <<matherr>>.
|
||
|
|
|
||
|
|
PORTABILITY
|
||
|
|
<<fmod>> is ANSI C. <<fmodf>> is an extension.
|
||
|
|
*/
|
||
|
|
|
||
|
|
/*
|
||
|
|
* wrapper fmod(x,y)
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "fdlibm.h"
|
||
|
|
#include <errno.h>
|
||
|
|
|
||
|
|
#ifndef _DOUBLE_IS_32BITS
|
||
|
|
|
||
|
|
#ifdef __STDC__
|
||
|
|
double fmod(double x, double y) /* wrapper fmod */
|
||
|
|
#else
|
||
|
|
double fmod(x,y) /* wrapper fmod */
|
||
|
|
double x,y;
|
||
|
|
#endif
|
||
|
|
{
|
||
|
|
#ifdef _IEEE_LIBM
|
||
|
|
return __ieee754_fmod(x,y);
|
||
|
|
#else
|
||
|
|
double z;
|
||
|
|
struct exception exc;
|
||
|
|
z = __ieee754_fmod(x,y);
|
||
|
|
if(_LIB_VERSION == _IEEE_ ||isnan(y)||isnan(x)) return z;
|
||
|
|
if(y==0.0) {
|
||
|
|
/* fmod(x,0) */
|
||
|
|
exc.type = DOMAIN;
|
||
|
|
exc.name = "fmod";
|
||
|
|
exc.arg1 = x;
|
||
|
|
exc.arg2 = y;
|
||
|
|
exc.err = 0;
|
||
|
|
if (_LIB_VERSION == _SVID_)
|
||
|
|
exc.retval = x;
|
||
|
|
else
|
||
|
|
exc.retval = 0.0/0.0;
|
||
|
|
if (_LIB_VERSION == _POSIX_)
|
||
|
|
errno = EDOM;
|
||
|
|
else if (!matherr(&exc)) {
|
||
|
|
errno = EDOM;
|
||
|
|
}
|
||
|
|
if (exc.err != 0)
|
||
|
|
errno = exc.err;
|
||
|
|
return exc.retval;
|
||
|
|
} else
|
||
|
|
return z;
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* defined(_DOUBLE_IS_32BITS) */
|