lib/libc/gen/signbit.c

   1 /*      $OpenBSD: signbit.c,v 1.7 2013/07/03 04:46:36 espie 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 #include <sys/types.h>
  19 #include <machine/ieee.h>
  20 #include <float.h>
  21 #include <math.h>
  22
  23 int
  24 __signbit(double d)
  25 {
  26         struct ieee_double *p = (struct ieee_double *)&d;
  27
  28         return p->dbl_sign;
  29 }
  30
  31 int
  32 __signbitf(float f)
  33 {
  34         struct ieee_single *p = (struct ieee_single *)&f;
  35
  36         return p->sng_sign;
  37 }