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72 lines
2.2 KiB
C
72 lines
2.2 KiB
C
/* Raise given exceptions.
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Copyright (C) 1997, 1999, 2000, 2002 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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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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#include <shlib-compat.h>
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int
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__feraiseexcept (int excepts)
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{
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static volatile double sink;
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static const struct {
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double zero, one, max, min, sixteen, pi;
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} c = {
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0.0, 1.0, DBL_MAX, DBL_MIN, 16.0, M_PI
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};
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/* Raise exceptions represented by EXPECTS. But we must raise only
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one signal at a time. It is important the if the overflow/underflow
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exception and the inexact exception are given at the same time,
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the overflow/underflow exception follows the inexact exception. */
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/* First: invalid exception. */
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if ((FE_INVALID & excepts) != 0)
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/* One example of a invalid operation is 0/0. */
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sink = c.zero / c.zero;
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/* Next: division by zero. */
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if ((FE_DIVBYZERO & excepts) != 0)
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sink = c.one / c.zero;
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/* Next: overflow. */
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if ((FE_OVERFLOW & excepts) != 0)
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sink = c.max * c.max;
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/* Next: underflow. */
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if ((FE_UNDERFLOW & excepts) != 0)
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sink = c.min / c.sixteen;
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/* Last: inexact. */
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if ((FE_INEXACT & excepts) != 0)
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sink = c.one / c.pi;
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/* Success. */
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return 0;
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}
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__feraiseexcept, __old_feraiseexcept)
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compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feraiseexcept, feraiseexcept)
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versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
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