gonzui: t2ex/bsd_source/lib/libc/src

    1: /*      $OpenBSD: signbit.c,v 1.4 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: #include <math.h>
   25: 
   26: int
   27: __signbit(double d)
   28: {
   29:         struct ieee_double *p = (struct ieee_double *)&d;
   30: 
   31:         return p->dbl_sign;
   32: }
   33: 
   34: int
   35: __signbitf(float f)
   36: {
   37:         struct ieee_single *p = (struct ieee_single *)&f;
   38: 
   39:         return p->sng_sign;
   40: }
   41: 
   42: #if     LDBL_MANT_DIG == 53
   43: #ifdef  lint
   44: /* PROTOLIB1 */
   45: int __signbitl(long double);
   46: #else   /* lint */
   47: __weak_alias(__signbitl, __signbit);
   48: #endif  /* lint */
   49: #endif  /* LDBL_MANT_DIG == 53 */