1*7c478bd9Sstevel@tonic-gate /* 2*7c478bd9Sstevel@tonic-gate * CDDL HEADER START 3*7c478bd9Sstevel@tonic-gate * 4*7c478bd9Sstevel@tonic-gate * The contents of this file are subject to the terms of the 5*7c478bd9Sstevel@tonic-gate * Common Development and Distribution License, Version 1.0 only 6*7c478bd9Sstevel@tonic-gate * (the "License"). You may not use this file except in compliance 7*7c478bd9Sstevel@tonic-gate * with the License. 8*7c478bd9Sstevel@tonic-gate * 9*7c478bd9Sstevel@tonic-gate * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*7c478bd9Sstevel@tonic-gate * or http://www.opensolaris.org/os/licensing. 11*7c478bd9Sstevel@tonic-gate * See the License for the specific language governing permissions 12*7c478bd9Sstevel@tonic-gate * and limitations under the License. 13*7c478bd9Sstevel@tonic-gate * 14*7c478bd9Sstevel@tonic-gate * When distributing Covered Code, include this CDDL HEADER in each 15*7c478bd9Sstevel@tonic-gate * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*7c478bd9Sstevel@tonic-gate * If applicable, add the following below this CDDL HEADER, with the 17*7c478bd9Sstevel@tonic-gate * fields enclosed by brackets "[]" replaced with your own identifying 18*7c478bd9Sstevel@tonic-gate * information: Portions Copyright [yyyy] [name of copyright owner] 19*7c478bd9Sstevel@tonic-gate * 20*7c478bd9Sstevel@tonic-gate * CDDL HEADER END 21*7c478bd9Sstevel@tonic-gate */ 22*7c478bd9Sstevel@tonic-gate #pragma ident "%Z%%M% %I% %E% SMI" /* from ATT S5R3 */ 23*7c478bd9Sstevel@tonic-gate 24*7c478bd9Sstevel@tonic-gate /* The following is extracted from... */ 25*7c478bd9Sstevel@tonic-gate 26*7c478bd9Sstevel@tonic-gate /* Copyright (c) 1984 AT&T */ 27*7c478bd9Sstevel@tonic-gate /* All Rights Reserved */ 28*7c478bd9Sstevel@tonic-gate 29*7c478bd9Sstevel@tonic-gate 30*7c478bd9Sstevel@tonic-gate /* 31*7c478bd9Sstevel@tonic-gate * modf(value, iptr) returns the signed fractional part of value 32*7c478bd9Sstevel@tonic-gate * and stores the integer part indirectly through iptr. 33*7c478bd9Sstevel@tonic-gate * 34*7c478bd9Sstevel@tonic-gate */ 35*7c478bd9Sstevel@tonic-gate 36*7c478bd9Sstevel@tonic-gate #define MAXPOWTWO 4.503599627370496000E+15 37*7c478bd9Sstevel@tonic-gate /* doubles >= MAXPOWTWO are already integers */ 38*7c478bd9Sstevel@tonic-gate double 39*7c478bd9Sstevel@tonic-gate modf(value, iptr) 40*7c478bd9Sstevel@tonic-gate double value; 41*7c478bd9Sstevel@tonic-gate register double *iptr; 42*7c478bd9Sstevel@tonic-gate { 43*7c478bd9Sstevel@tonic-gate register double absvalue; 44*7c478bd9Sstevel@tonic-gate 45*7c478bd9Sstevel@tonic-gate if ((absvalue = (value >= 0.0) ? value : -value) >= MAXPOWTWO) 46*7c478bd9Sstevel@tonic-gate *iptr = value; /* it must be an integer */ 47*7c478bd9Sstevel@tonic-gate else { 48*7c478bd9Sstevel@tonic-gate *iptr = absvalue + MAXPOWTWO; /* shift fraction off right */ 49*7c478bd9Sstevel@tonic-gate *iptr -= MAXPOWTWO; /* shift back without fraction */ 50*7c478bd9Sstevel@tonic-gate while (*iptr > absvalue) /* above arithmetic might round */ 51*7c478bd9Sstevel@tonic-gate *iptr -= 1.0; /* test again just to be sure */ 52*7c478bd9Sstevel@tonic-gate if (value < 0.0) 53*7c478bd9Sstevel@tonic-gate *iptr = -*iptr; 54*7c478bd9Sstevel@tonic-gate } 55*7c478bd9Sstevel@tonic-gate return (value - *iptr); /* signed fractional part */ 56*7c478bd9Sstevel@tonic-gate } 57