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LibC: Implement fenv.h

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Mițca Dumitru 2021-02-24 12:43:47 +02:00 • committed by Andreas Kling
parent 53c4be926b
commit 00ef931f79
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Userland/Libraries/LibC/fenv.h Normal file
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/*
* Copyright (c) 2021, Mițca Dumitru <dumitru0mitca@gmail.com>
* 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
*/
#pragma once
#include <stdint.h>
#include <sys/cdefs.h>
__BEGIN_DECLS
struct __x87_floating_point_environment {
uint16_t __control_word;
uint16_t __reserved1;
uint16_t __status_word;
uint16_t __reserved2;
uint16_t __tag_word;
uint16_t __reserved3;
uint32_t __fpu_ip_offset;
uint16_t __fpu_ip_selector;
uint16_t __opcode : 11;
uint16_t __reserved4 : 5;
uint32_t __fpu_data_offset;
uint16_t __fpu_data_selector;
uint16_t __reserved5;
};
typedef struct fenv_t {
struct __x87_floating_point_environment __x87_fpu_env;
uint32_t __mxcsr;
} fenv_t;
#define FE_DFL_ENV ((const fenv_t*)-1)
int fegetenv(fenv_t*);
int fesetenv(const fenv_t*);
int feholdexcept(fenv_t*);
int feupdateenv(const fenv_t*);
#define FE_INVALID 1u << 0
#define FE_DIVBYZERO 1u << 2
#define FE_OVERFLOW 1u << 3
#define FE_UNDERFLOW 1u << 4
#define FE_INEXACT 1u << 5
#define FE_ALL_EXCEPT (FE_DIVBYZERO | FE_INEXACT | FE_INVALID | FE_OVERFLOW | FE_UNDERFLOW)
typedef uint16_t fexcept_t;
int fegetexceptflag(fexcept_t*, int exceptions);
int fesetexceptflag(const fexcept_t*, int exceptions);
int feclearexcepts(int exceptions);
int fetestexcept(int exceptions);
int feraiseexcept(int exceptions);
#define FE_TONEAREST 0
#define FE_DOWNWARD 1
#define FE_UPWARD 2
#define FE_TOWARDSZERO 3
int fesetround(int round);
int fegetround(void);
__END_DECLS