text: /*	$OpenBSD: s_round.c,v 1.2 2011/07/06 00:02:42 martynas Exp $	*/
  
  /*-
   * Copyright (c) 2003, Steven G. Kargl
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice unmodified, this list of conditions, and the following
   *    disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  /* LINTLIBRARY */
  
  #include <sys/cdefs.h>
  #include <float.h>
  #include <math.h>
  
  #include "math_private.h"
  
  double
  round(double x)
  {
  	double t;
  
  	if (isinf(x) || isnan(x))
  		return (x);
  
  	if (x >= 0.0) {
  		t = floor(x);
  		if (t - x <= -0.5)
  			t += 1.0;
  		return (t);
  	} else {
  		t = floor(-x);
  		if (t + x <= -0.5)
  			t += 1.0;
  		return (-t);
  	}
  }
  
  #if	LDBL_MANT_DIG == 53
  #ifdef	lint
  /* PROTOLIB1 */
  long double roundl(long double);
  #else	/* lint */
  __weak_alias(roundl, round);
  #endif	/* lint */
  #endif	/* LDBL_MANT_DIG == 53 */
  