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       1                 :             : /*-
       2                 :             :  * Copyright (c) 2005 David Schultz <das@FreeBSD.ORG>
       3                 :             :  * All rights reserved.
       4                 :             :  *
       5                 :             :  * Redistribution and use in source and binary forms, with or without
       6                 :             :  * modification, are permitted provided that the following conditions
       7                 :             :  * are met:
       8                 :             :  * 1. Redistributions of source code must retain the above copyright
       9                 :             :  *    notice, this list of conditions and the following disclaimer.
      10                 :             :  * 2. Redistributions in binary form must reproduce the above copyright
      11                 :             :  *    notice, this list of conditions and the following disclaimer in the
      12                 :             :  *    documentation and/or other materials provided with the distribution.
      13                 :             :  *
      14                 :             :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
      15                 :             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      16                 :             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      17                 :             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
      18                 :             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      19                 :             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      20                 :             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      21                 :             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      22                 :             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      23                 :             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      24                 :             :  * SUCH DAMAGE.
      25                 :             :  */
      26                 :             : 
      27                 :             : #include "cdefs-compat.h"
      28                 :             : 
      29                 :             : #include <limits.h>
      30                 :             : #include <openlibm_fenv.h>
      31                 :             : #include <openlibm_math.h>
      32                 :             : 
      33                 :             : #include "math_private.h"
      34                 :             : 
      35                 :             : #ifndef type
      36                 :             : //__FBSDID("$FreeBSD: src/lib/msun/src/s_lround.c,v 1.2 2005/04/08 00:52:16 das Exp $");
      37                 :             : #define type            double
      38                 :             : #define roundit         round
      39                 :             : #define dtype           long
      40                 :             : #define DTYPE_MIN       LONG_MIN
      41                 :             : #define DTYPE_MAX       LONG_MAX
      42                 :             : #define fn              lround
      43                 :             : #endif
      44                 :             : 
      45                 :             : /*
      46                 :             :  * If type has more precision than dtype, the endpoints dtype_(min|max) are
      47                 :             :  * of the form xxx.5; they are "out of range" because lround() rounds away
      48                 :             :  * from 0.  On the other hand, if type has less precision than dtype, then
      49                 :             :  * all values that are out of range are integral, so we might as well assume
      50                 :             :  * that everything is in range.  At compile time, INRANGE(x) should reduce to
      51                 :             :  * two floating-point comparisons in the former case, or TRUE otherwise.
      52                 :             :  */
      53                 :             : static const type dtype_min = DTYPE_MIN - 0.5;
      54                 :             : static const type dtype_max = DTYPE_MAX + 0.5;
      55                 :             : #define INRANGE(x)      (dtype_max - DTYPE_MAX != 0.5 || \
      56                 :             :                          ((x) > dtype_min && (x) < dtype_max))
      57                 :             : 
      58                 :             : OLM_DLLEXPORT dtype
      59                 :          74 : fn(type x)
      60                 :             : {
      61                 :             : 
      62   [ -  +  -  -  :          74 :         if (INRANGE(x)) {
                   -  - ]
      63                 :          74 :                 x = roundit(x);
      64                 :          74 :                 return ((dtype)x);
      65                 :             :         } else {
      66                 :           0 :                 feraiseexcept(FE_INVALID);
      67                 :           0 :                 return (DTYPE_MAX);
      68                 :             :         }
      69                 :             : }