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