| /*- |
| * 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 = DTYPE_MIN - 0.5; |
| static const type dtype_max = DTYPE_MAX + 0.5; |
| #define INRANGE(x) (dtype_max - 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); |
| } |
| } |
