feholdexcpt.c

来自「glibc 2.9,最新版的C语言库函数」· C语言 代码 · 共 37 行

/* Store current floating-point environment and clear exceptions.
   Copyright (C) 1997, 1998, 2005, 2007 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 Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
   02111-1307 USA.  */

#include <fenv.h>

int
feholdexcept (fenv_t *envp)
{
  fenv_t tmp;

  __fenv_stfsr (*envp);

  /* Set all exceptions to non-stop and clear all exceptions.  */
  tmp = *envp & ~((0x1f << 23) | FE_ALL_EXCEPT);

  __fenv_ldfsr (tmp);

  return 0;
}
libm_hidden_def (feholdexcept)