/* Copyright (C) 1997 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Library General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ /* * ISO C 9X 7.6: Floating-point environment <fenv.h> */ #ifndef _FENV_H #define _FENV_H 1 #include <features.h> /* Get the architecture dependend definitions. The following definitions are expected to be done: fenv_t type for object representing an entire floating-point environment FE_DFL_ENV macro of type pointer to fenv_t to be used as the argument to functions taking an argument of type fenv_t; in this case the default environment will be used fexcept_t type for object representing the floating-point exception flags including status associated with the flags The following macros are defined iff the implementation supports this kind of exception. FE_INEXACT inexact result FE_DIVBYZERO devision by zero FE_UNDERFLOW result not representable due to underflow FE_OVERFLOW result not representable due to overflow FE_INVALID invalid operation FE_ALL_EXCEPT bitwise OR of all supported exceptions The next macros are defined iff the appropriate rounding mode is supported by the implementation. FE_TONEAREST round to nearest FE_UPWARD round toward +Inf FE_DOWNWARD round toward -Inf FE_TOWARDZERO round toward 0 */ #include <bits/fenv.h> __BEGIN_DECLS /* Floating-point exception handling. */ /* Clear the supported exceptions represented by EXCEPTS. */ extern void feclearexcept __P ((int __excepts)); /* Store implementation-defined representation of the exception flags indicated by EXCEPTS in the object pointed to by FLAGP. */ extern void fegetexceptflag __P ((fexcept_t *__flagp, int __excepts)); /* Raise the supported exceptions represented by EXCEPTS. */ extern void feraiseexcept __P ((int __excepts)); /* Set complete status for exceptions indicated by EXCEPTS according to the representation in the object pointed to by FLAGP. */ extern void fesetexceptflag __P ((__const fexcept_t *__flagp, int __excepts)); /* Determine which of subset of the exceptions specified by EXCEPTS are currently set. */ extern int fetestexcept __P ((int __excepts)); /* Rounding control. */ /* Get current rounding direction. */ extern int fegetround __P ((void)); /* Establish the rounding direction represented by ROUND. */ extern int fesetround __P ((int __rounding_direction)); /* Floating-point environment. */ /* Store the current floating-point environment in the object pointed to by ENVP. */ extern void fegetenv __P ((fenv_t *__envp)); /* Save the current environment in the object pointed to by ENVP, clear exception flags and install a non-stop mode (if available) for all exceptions. */ extern int feholdexcept __P ((fenv_t *__envp)); /* Establish the floating-point environment represented by the object pointed to by ENVP. */ extern void fesetenv __P ((__const fenv_t *__envp)); /* Save current exceptions in temporary storage, install environment represented by object pointed to by ENVP and raise exceptions according to saved exceptions. */ extern void feupdateenv __P ((__const fenv_t *__envp)); __END_DECLS #endif /* fenv.h */