115 lines
3.9 KiB
C
115 lines
3.9 KiB
C
/* Copyright (C) 1997 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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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/*
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* ISO C 9X 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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#include <features.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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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 devision 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 void feclearexcept __P ((int __excepts));
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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 void fegetexceptflag __P ((fexcept_t *__flagp, int __excepts));
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/* Raise the supported exceptions represented by EXCEPTS. */
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extern void feraiseexcept __P ((int __excepts));
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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 void fesetexceptflag __P ((__const fexcept_t *__flagp, int __excepts));
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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 __P ((int __excepts));
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/* Rounding control. */
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/* Get current rounding direction. */
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extern int fegetround __P ((void));
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/* Establish the rounding direction represented by ROUND. */
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extern int fesetround __P ((int __rounding_direction));
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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 void fegetenv __P ((fenv_t *__envp));
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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 __P ((fenv_t *__envp));
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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 void fesetenv __P ((__const fenv_t *__envp));
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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 void feupdateenv __P ((__const fenv_t *__envp));
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__END_DECLS
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#endif /* fenv.h */
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