/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
#pragma ident	"%Z%%M%	%I%	%E% SMI"  /* from ATT S5R3 */

/*	The following is extracted from...	*/

/*	Copyright (c) 1984 AT&T	*/
/*	  All Rights Reserved  	*/


/*
 * modf(value, iptr) returns the signed fractional part of value
 * and stores the integer part indirectly through iptr.
 *
 */

#define MAXPOWTWO	4.503599627370496000E+15
			/* doubles >= MAXPOWTWO are already integers */
double
modf(value, iptr)
double value;
register double *iptr;
{
	register double absvalue;

	if ((absvalue = (value >= 0.0) ? value : -value) >= MAXPOWTWO)
		*iptr = value; /* it must be an integer */
	else {
		*iptr = absvalue + MAXPOWTWO; /* shift fraction off right */
		*iptr -= MAXPOWTWO; /* shift back without fraction */
		while (*iptr > absvalue) /* above arithmetic might round */
			*iptr -= 1.0; /* test again just to be sure */
		if (value < 0.0)
			*iptr = -*iptr;
	}
	return (value - *iptr); /* signed fractional part */
}