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      1 /*-
      2  * Copyright (c) 2003, Steven G. Kargl
      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 unmodified, this list of conditions, and the following
     10  *    disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  *
     15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     25  */
     26 
     27 #include <sys/cdefs.h>
     28 __RCSID("$NetBSD: s_roundl.c,v 1.1 2013/11/11 23:57:34 joerg Exp $");
     29 #if 0
     30 __FBSDID("$FreeBSD: head/lib/msun/src/s_roundl.c 153017 2005-12-02 13:45:06Z bde $");
     31 #endif
     32 
     33 #include "namespace.h"
     34 #include <math.h>
     35 
     36 #ifdef __HAVE_LONG_DOUBLE
     37 
     38 #ifdef __weak_alias
     39 __weak_alias(roundl, _roundl)
     40 #endif
     41 
     42 long double
     43 roundl(long double x)
     44 {
     45 	long double t;
     46 
     47 	if (!isfinite(x))
     48 		return (x);
     49 
     50 	if (x >= 0.0) {
     51 		t = floorl(x);
     52 		if (t - x <= -0.5)
     53 			t += 1.0;
     54 		return (t);
     55 	} else {
     56 		t = floorl(-x);
     57 		if (t + x <= -0.5)
     58 			t += 1.0;
     59 		return (-t);
     60 	}
     61 }
     62 
     63 #endif /* __HAVE_LONG_DOUBLE */
     64