contrib/openbsd_libm/src/s_nearbyint.c

   1 /*      $OpenBSD: s_nearbyint.c,v 1.1 2011/04/28 18:05:39 martynas Exp $        */
   2
   3 /*
   4  * Copyright (c) 2011 Martynas Venckus <martynas@openbsd.org>
   5  *
   6  * Permission to use, copy, modify, and distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include <fenv.h>
  20 #include <math.h>
  21
  22 double
  23 nearbyint(double x)
  24 {
  25         fenv_t fenv;
  26         double res;
  27
  28         feholdexcept(&fenv);
  29         res = rint(x);
  30         fesetenv(&fenv);
  31
  32         return (res);
  33 }
  34
  35 float
  36 nearbyintf(float x)
  37 {
  38         fenv_t fenv;
  39         float res;
  40
  41         feholdexcept(&fenv);
  42         res = rintf(x);
  43         fesetenv(&fenv);
  44
  45         return (res);
  46 }
  47
  48 long double
  49 nearbyintl(long double x)
  50 {
  51         fenv_t fenv;
  52         long double res;
  53
  54         feholdexcept(&fenv);
  55         res = rintl(x);
  56         fesetenv(&fenv);
  57
  58         return (res);
  59 }