48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Return positive difference between arguments.
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Copyright (C) 1997, 2004, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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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, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <math.h>
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double
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__fdim (double x, double y)
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{
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int clsx = fpclassify (x);
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int clsy = fpclassify (y);
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if (clsx == FP_NAN || clsy == FP_NAN
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|| (y < 0 && clsx == FP_INFINITE && clsy == FP_INFINITE))
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/* Raise invalid flag. */
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return x - y;
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if (x <= y)
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return 0.0;
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double r = x - y;
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if (fpclassify (r) == FP_INFINITE)
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__set_errno (ERANGE);
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return r;
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}
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weak_alias (__fdim, fdim)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__fdim, __fdiml)
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weak_alias (__fdim, fdiml)
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#endif
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