| The Android Open Source Project | a27d2ba | 2008-10-21 07:00:00 -0700 | [diff] [blame^] | 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 <sys/cdefs.h> |
| 28 | #include <limits.h> |
| 29 | #include <fenv.h> |
| 30 | #include <math.h> |
| 31 | |
| 32 | #ifndef type |
| 33 | /* __FBSDID("$FreeBSD: src/lib/msun/src/s_lround.c,v 1.2 2005/04/08 00:52:16 das Exp $"); */ |
| 34 | #define type double |
| 35 | #define roundit round |
| 36 | #define dtype long |
| 37 | #define DTYPE_MIN LONG_MIN |
| 38 | #define DTYPE_MAX LONG_MAX |
| 39 | #define fn lround |
| 40 | #endif |
| 41 | |
| 42 | /* |
| 43 | * If type has more precision than dtype, the endpoints dtype_(min|max) are |
| 44 | * of the form xxx.5; they are "out of range" because lround() rounds away |
| 45 | * from 0. On the other hand, if type has less precision than dtype, then |
| 46 | * all values that are out of range are integral, so we might as well assume |
| 47 | * that everything is in range. At compile time, INRANGE(x) should reduce to |
| 48 | * two floating-point comparisons in the former case, or TRUE otherwise. |
| 49 | */ |
| 50 | static const type dtype_min = DTYPE_MIN - 0.5; |
| 51 | static const type dtype_max = DTYPE_MAX + 0.5; |
| 52 | #define INRANGE(x) (dtype_max - DTYPE_MAX != 0.5 || \ |
| 53 | ((x) > dtype_min && (x) < dtype_max)) |
| 54 | |
| 55 | dtype |
| 56 | fn(type x) |
| 57 | { |
| 58 | |
| 59 | if (INRANGE(x)) { |
| 60 | x = roundit(x); |
| 61 | return ((dtype)x); |
| 62 | } else { |
| 63 | feraiseexcept(FE_INVALID); |
| 64 | return (DTYPE_MAX); |
| 65 | } |
| 66 | } |