/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * Copyright (c) 1999-2003 Apple Computer, Inc. All Rights Reserved. * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* Copyright (c) 1992, 1997 NeXT Software, Inc. All rights reserved. * * File: libc/gen/ppc/isinf.c * Author: Derek B Clegg, NeXT Software, Inc. * * HISTORY * 24-Jan-1997 Umesh Vaishampayan (umeshv@NeXT.com) * Ported to PPC. * 11-Nov-92 Derek B Clegg (dclegg@next.com) * Created. * * int isinf(double value); * * Returns 1 if `value' is equal to positive IEEE infinity, -1 if `value' * is equal to negative IEEE infinity, 0 otherwise. * * An IEEE infinity is a double value with the maximum biased exponent value * (2047) and a zero fraction value. */ #import "fp.h" int isinf(double value) { union dbl d; d.value = value; if (d.u[0] == 0x7FF00000 && d.u[1] == 0) return 1; if (d.u[0] == 0xFFF00000 && d.u[1] == 0) return -1; return 0; }