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/* @(#)w_remainder.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

<<remainder>>, <<remainderf>>---round and  remainder

INDEX

        remainder

INDEX

        remainderf

ANSI_SYNOPSIS

        #include <math.h>

        double remainder(double <[x]>, double <[y]>);

        float remainderf(float <[x]>, float <[y]>);

TRAD_SYNOPSIS

        #include <math.h>

        double remainder(<[x]>,<[y]>)

        double <[x]>, <[y]>;

        float remainderf(<[x]>,<[y]>)

        float <[x]>, <[y]>;

DESCRIPTION

<<remainder>> and <<remainderf>> find the remainder of

<[x]>/<[y]>; this value is in the range -<[y]>/2 .. +<[y]>/2.

RETURNS

<<remainder>> returns the integer result as a double.

PORTABILITY

<<remainder>> is a System V release 4.

<<remainderf>> is an extension.

*/

/*

 * wrapper remainder(x,p)

 */

#include "fdlibm.h"

#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__

        double remainder(double x, double y)    /* wrapper remainder */

#else

        double remainder(x,y)                   /* wrapper remainder */

        double x,y;

#endif

{

#ifdef _IEEE_LIBM

        return __ieee754_remainder(x,y);

#else

        double z;

        struct exception exc;

        z = __ieee754_remainder(x,y);

        if(_LIB_VERSION == _IEEE_ || isnan(y)) return z;

        if(y==0.0) {

            /* remainder(x,0) */

            exc.type = DOMAIN;

            exc.name = "remainder";

            exc.err = 0;

            exc.arg1 = x;

            exc.arg2 = y;

            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) */