text: /*-
   * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   *
   * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
   * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
   */
  
  #include <sys/cdefs.h>
  #include <sys/limits.h>
  #include <fenv.h>
  #include <math.h>
  
  #ifndef type
  __FBSDID("$FreeBSD$");
  #define type		double
  #define	roundit		round
  #define dtype		long
  #define	DTYPE_MIN	LONG_MIN
  #define	DTYPE_MAX	LONG_MAX
  #define	fn		lround
  #endif
  
  /*
   * If type has more precision than dtype, the endpoints dtype_(min|max) are
   * of the form xxx.5; they are "out of range" because lround() rounds away
   * from 0.  On the other hand, if type has less precision than dtype, then
   * all values that are out of range are integral, so we might as well assume
   * that everything is in range.  At compile time, INRANGE(x) should reduce to
   * two floating-point comparisons in the former case, or TRUE otherwise.
   */
  static const type dtype_min = (type)DTYPE_MIN - 0.5;
  static const type dtype_max = (type)DTYPE_MAX + 0.5;
  #define	INRANGE(x)	(dtype_max - (type)DTYPE_MAX != 0.5 || \
  			 ((x) > dtype_min && (x) < dtype_max))
  
  dtype
  fn(type x)
  {
  
  	if (INRANGE(x)) {
  		x = roundit(x);
  		return ((dtype)x);
  	} else {
  		feraiseexcept(FE_INVALID);
  		return (DTYPE_MAX);
  	}
  }
  