gonzui

    1: /*      $OpenBSD: isnan.c,v 1.5 2011/05/30 17:28:15 martynas Exp $   */
    2: /*
    3:  * Copyright (c) 2008 Martynas Venckus <martynas@openbsd.org>
    4:  *
    5:  * Permission to use, copy, modify, and distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   11:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   15:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   16:  */
   17: 
   18: /* LINTLIBRARY */
   19: 
   20: #include <sys/types.h>
   21: #include <sys/cdefs.h>
   22: #include <machine/ieee.h>
   23: #include <float.h>
   24: 
   25: int
   26: __isnan(double d)
   27: {
   28:         struct ieee_double *p = (struct ieee_double *)&d;
   29: 
   30:         return (p->dbl_exp == DBL_EXP_INFNAN &&
   31:             (p->dbl_frach != 0 || p->dbl_fracl != 0));
   32: }
   33: 
   34: int
   35: __isnanf(float f)
   36: {
   37:         struct ieee_single *p = (struct ieee_single *)&f;
   38:  
   39:         return (p->sng_exp == SNG_EXP_INFNAN && p->sng_frac != 0);
   40: }
   41: 
   42: #if     LDBL_MANT_DIG == 53
   43: #ifdef  lint
   44: /* PROTOLIB1 */
   45: int __isnanl(long double);
   46: #else   /* lint */
   47: __weak_alias(__isnanl, __isnan);
   48: #endif  /* lint */
   49: #endif  /* LDBL_MANT_DIG == 53 */
   50: 
   51: /*
   52:  * 3BSD compatibility aliases.
   53:  */
   54: __weak_alias(isnan, __isnan);
   55: __weak_alias(isnanf, __isnanf);