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/* @(#)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

@ifinfo

<[x]>-<[i]>*<[y]>,

@end ifinfo

@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) */