/* Copyright (C) 1997-2018 Free Software Foundation, Inc.

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This file is part of the GNU C Library.

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The GNU C Library is free software; you can redistribute it and/or

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modify it under the terms of the GNU Lesser General Public

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License as published by the Free Software Foundation; either

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version 2.1 of the License, or (at your option) any later version.

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The GNU C Library is distributed in the hope that it will be useful,

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but WITHOUT ANY WARRANTY; without even the implied warranty of

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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

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Lesser General Public License for more details.

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You should have received a copy of the GNU Lesser General Public

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License along with the GNU C Library; if not, see

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<http://www.gnu.org/licenses/>. */

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/*

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* ISO C99 7.6: Floating-point environment <fenv.h>

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*/

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#ifndef _FENV_H

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#define _FENV_H 1

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#define __GLIBC_INTERNAL_STARTING_HEADER_IMPLEMENTATION

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#include <bits/libc-header-start.h>

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/* Get the architecture dependend definitions. The following definitions

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are expected to be done:

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fenv_t type for object representing an entire floating-point

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environment

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FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument

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to functions taking an argument of type fenv_t; in this

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case the default environment will be used

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fexcept_t type for object representing the floating-point exception

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flags including status associated with the flags

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femode_t type for object representing floating-point control modes

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FE_DFL_MODE macro of type pointer to const femode_t to be used as the

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argument to fesetmode; in this case the default control

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modes will be used

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The following macros are defined iff the implementation supports this

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kind of exception.

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FE_INEXACT inexact result

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FE_DIVBYZERO division by zero

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FE_UNDERFLOW result not representable due to underflow

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FE_OVERFLOW result not representable due to overflow

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FE_INVALID invalid operation

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FE_ALL_EXCEPT bitwise OR of all supported exceptions

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The next macros are defined iff the appropriate rounding mode is

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supported by the implementation.

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FE_TONEAREST round to nearest

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FE_UPWARD round toward +Inf

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FE_DOWNWARD round toward -Inf

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FE_TOWARDZERO round toward 0

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*/

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#include <bits/fenv.h>

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__BEGIN_DECLS

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/* Floating-point exception handling. */

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/* Clear the supported exceptions represented by EXCEPTS. */

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extern int feclearexcept (int __excepts) __THROW;

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/* Store implementation-defined representation of the exception flags

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indicated by EXCEPTS in the object pointed to by FLAGP. */

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extern int fegetexceptflag (fexcept_t *__flagp, int __excepts) __THROW;

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/* Raise the supported exceptions represented by EXCEPTS. */

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extern int feraiseexcept (int __excepts) __THROW;

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#if __GLIBC_USE (IEC_60559_BFP_EXT)

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/* Set the supported exception flags represented by EXCEPTS, without

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causing enabled traps to be taken. */

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extern int fesetexcept (int __excepts) __THROW;

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#endif

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/* Set complete status for exceptions indicated by EXCEPTS according to

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the representation in the object pointed to by FLAGP. */

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extern int fesetexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;

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/* Determine which of subset of the exceptions specified by EXCEPTS are

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currently set. */

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extern int fetestexcept (int __excepts) __THROW;

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#if __GLIBC_USE (IEC_60559_BFP_EXT)

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/* Determine which of subset of the exceptions specified by EXCEPTS

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are set in *FLAGP. */

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extern int fetestexceptflag (const fexcept_t *__flagp, int __excepts) __THROW;

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#endif

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/* Rounding control. */

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/* Get current rounding direction. */

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extern int fegetround (void) __THROW __attribute_pure__;

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/* Establish the rounding direction represented by ROUND. */

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extern int fesetround (int __rounding_direction) __THROW;

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/* Floating-point environment. */

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/* Store the current floating-point environment in the object pointed

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to by ENVP. */

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extern int fegetenv (fenv_t *__envp) __THROW;

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/* Save the current environment in the object pointed to by ENVP, clear

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exception flags and install a non-stop mode (if available) for all

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exceptions. */

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extern int feholdexcept (fenv_t *__envp) __THROW;

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/* Establish the floating-point environment represented by the object

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pointed to by ENVP. */

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extern int fesetenv (const fenv_t *__envp) __THROW;

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/* Save current exceptions in temporary storage, install environment

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represented by object pointed to by ENVP and raise exceptions

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according to saved exceptions. */

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extern int feupdateenv (const fenv_t *__envp) __THROW;

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/* Control modes. */

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#if __GLIBC_USE (IEC_60559_BFP_EXT)

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/* Store the current floating-point control modes in the object

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pointed to by MODEP. */

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extern int fegetmode (femode_t *__modep) __THROW;

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/* Establish the floating-point control modes represented by the

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object pointed to by MODEP. */

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extern int fesetmode (const femode_t *__modep) __THROW;

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#endif

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/* Include optimization. */

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#ifdef __OPTIMIZE__

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# include <bits/fenvinline.h>

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#endif

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/* NaN support. */

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#if (__GLIBC_USE (IEC_60559_BFP_EXT) \

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&& defined FE_INVALID \

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&& defined __SUPPORT_SNAN__)

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# define FE_SNANS_ALWAYS_SIGNAL 1

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#endif

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#ifdef __USE_GNU

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/* Enable individual exceptions. Will not enable more exceptions than

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EXCEPTS specifies. Returns the previous enabled exceptions if all

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exceptions are successfully set, otherwise returns -1. */

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extern int feenableexcept (int __excepts) __THROW;

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/* Disable individual exceptions. Will not disable more exceptions than

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EXCEPTS specifies. Returns the previous enabled exceptions if all

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exceptions are successfully disabled, otherwise returns -1. */

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extern int fedisableexcept (int __excepts) __THROW;

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/* Return enabled exceptions. */

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extern int fegetexcept (void) __THROW;

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#endif

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__END_DECLS

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#endif /* fenv.h */

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