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