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/* Copyright (C) 1997, 1999, 2000 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, write to the Free |
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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02111-1307 USA. */ |
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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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#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 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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/* 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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/* Rounding control. */ |
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/* Get current rounding direction. */ |
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extern int fegetround (void) __THROW; |
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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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/* 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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#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 */ |
