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Annotation of src/lib/libc/gen/isnand_ieee754.c, Revision 1.1

1.1     ! kleink      1: /*     $NetBSD$        */
        !             2:
        !             3: /*
        !             4:  * Copyright (c) 1992, 1993
        !             5:  *     The Regents of the University of California.  All rights reserved.
        !             6:  *
        !             7:  * This software was developed by the Computer Systems Engineering group
        !             8:  * at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
        !             9:  * contributed to Berkeley.
        !            10:  *
        !            11:  * Redistribution and use in source and binary forms, with or without
        !            12:  * modification, are permitted provided that the following conditions
        !            13:  * are met:
        !            14:  * 1. Redistributions of source code must retain the above copyright
        !            15:  *    notice, this list of conditions and the following disclaimer.
        !            16:  * 2. Redistributions in binary form must reproduce the above copyright
        !            17:  *    notice, this list of conditions and the following disclaimer in the
        !            18:  *    documentation and/or other materials provided with the distribution.
        !            19:  * 3. Neither the name of the University nor the names of its contributors
        !            20:  *    may be used to endorse or promote products derived from this software
        !            21:  *    without specific prior written permission.
        !            22:  *
        !            23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            33:  * SUCH DAMAGE.
        !            34:  *
        !            35:  * from: Header: isinf.c,v 1.1 91/07/08 19:03:34 torek Exp
        !            36:  */
        !            37:
        !            38: #include <sys/cdefs.h>
        !            39: #if defined(LIBC_SCCS) && !defined(lint)
        !            40: #if 0
        !            41: static char sccsid[] = "@(#)isinf.c    8.1 (Berkeley) 6/4/93";
        !            42: #else
        !            43: __RCSID("$NetBSD$");
        !            44: #endif
        !            45: #endif /* LIBC_SCCS and not lint */
        !            46:
        !            47: #include <machine/ieee.h>
        !            48: #include <math.h>
        !            49:
        !            50: /* libc.so.12 ABI compatbility */
        !            51: #ifdef __weak_alias
        !            52: __weak_alias(isnan,__isnand)
        !            53: #endif
        !            54:
        !            55: /*
        !            56:  * 7.12.3.4 isnan - test for a NaN
        !            57:  *          IEEE 754 double-precision version
        !            58:  */
        !            59: int
        !            60: __isnand(double x)
        !            61: {
        !            62:        union ieee_double_u u;
        !            63:
        !            64:        u.dblu_d = x;
        !            65:
        !            66:        return (u.dblu_dbl.dbl_exp == DBL_EXP_INFNAN &&
        !            67:            (u.dblu_dbl.dbl_frach != 0 || u.dblu_dbl.dbl_fracl != 0));
        !            68: }

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