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45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
/* Return quiet nan.
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Copyright (C) 1997-2015 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 <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ieee754.h>
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#undef __nan
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double
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__nan (const char *tagp)
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{
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if (tagp[0] != '\0')
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{
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char buf[6 + strlen (tagp)];
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sprintf (buf, "NAN(%s)", tagp);
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return strtod (buf, NULL);
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}
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return NAN;
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}
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weak_alias (__nan, nan)
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#ifdef NO_LONG_DOUBLE
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strong_alias (__nan, __nanl)
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weak_alias (__nan, nanl)
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#endif
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