gonzui: t2ex/bsd_source/lib/libc/src_bsd/math/s

    1: /*      $OpenBSD: s_fdim.c,v 1.4 2009/10/26 21:06:19 kettenis Exp $  */
    2: /*-
    3:  * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
    4:  * All rights reserved.
    5:  *
    6:  * Redistribution and use in source and binary forms, with or without
    7:  * modification, are permitted provided that the following conditions
    8:  * are met:
    9:  * 1. Redistributions of source code must retain the above copyright
   10:  *    notice, this list of conditions and the following 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 AND CONTRIBUTORS ``AS IS'' AND
   16:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25:  * SUCH DAMAGE.
   26:  */
   27: 
   28: #include <sys/cdefs.h>
   29: #include <float.h>
   30: #include <math.h>
   31: 
   32: #define DECL(type, fn)                  \
   33: type                                    \
   34: fn(type x, type y)                      \
   35: {                                       \
   36:                                         \
   37:         if (isnan(x))                  \
   38:                 return (x);           \
   39:         if (isnan(y))                  \
   40:                 return (y);           \
   41:         return (x > y ? x - y : 0.0);  \
   42: }
   43: 
   44: DECL(double, fdim)
   45: DECL(float, fdimf)
   46: DECL(long double, fdiml)