/*--------------------------------------------------------------------

 *© Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *--------------------------------------------------------------------

*/

/* @(#)s_modf.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.

 * ====================================================

 */

#ifndef __SYMBIAN32__

#ifndef lint

static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_modf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";

#endif

#endif //__SYMBIAN32__

/*

 * modf(double x, double *iptr)

 * return fraction part of x, and return x's integral part in *iptr.

 * Method:

 *	Bit twiddling.

 *

 * Exception:

 *	No exception.

 */

#include <math.h>

#include "math_private.h"

static const double one = 1.0;

EXPORT_C double modf(double x, double *iptr)

{

	int32_t i0,i1,j0;

	u_int32_t i;

	EXTRACT_WORDS(i0,i1,x);

	/*if x is NAN, return NAN with iptr = NAN*/

	#ifdef __SYMBIAN32__	

	if ( __isnan(x) )

	{	*iptr = x;

	 	return x;

	}

	#endif //__SYMBIAN32__

	j0 = ((i0>>20)&0x7ff)-0x3ff;	/* exponent of x */

	if(j0<20) {			/* integer part in high x */

	    if(j0<0) {			/* |x|<1 */

	        INSERT_WORDS(*iptr,i0&0x80000000,0);	/* *iptr = +-0 */

		return x;

	    } else {

		i = (0x000fffff)>>j0;

		if(((i0&i)|i1)==0) {		/* x is integral */

		    u_int32_t high;

		    *iptr = x;

		    GET_HIGH_WORD(high,x);

		    INSERT_WORDS(x,high&0x80000000,0);	/* return +-0 */

		    return x;

		} else {

		    INSERT_WORDS(*iptr,i0&(~i),0);

		    return x - *iptr;

		}

	    }

	} else if (j0>51) {		/* no fraction part */

	    u_int32_t high;

	    *iptr = x*one;

	    GET_HIGH_WORD(high,x);

	    INSERT_WORDS(x,high&0x80000000,0);	/* return +-0 */

	    return x;

	} else {			/* fraction part in low x */

	    i = ((u_int32_t)(0xffffffff))>>(j0-20);

	    if((i1&i)==0) { 		/* x is integral */

	        u_int32_t high;

		*iptr = x;

		GET_HIGH_WORD(high,x);

		INSERT_WORDS(x,high&0x80000000,0);	/* return +-0 */

		return x;

	    } else {

	        INSERT_WORDS(*iptr,i0,i1&(~i));

		return x - *iptr;

	    }

	}

}