55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
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/*
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* floatmagic.h -- Definitions of isnan and isinf for gawk.
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*/
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/*
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* Copyright (C) 2009 the Free Software Foundation, Inc.
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*
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* This file is part of GAWK, the GNU implementation of the
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* AWK Programming Language.
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*
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* GAWK is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* GAWK 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/*
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* NOTE: <math.h> MUST be included before this file. Also <config.h>.
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*
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* These definitions are taken from the Autoconf 2.63 manual. Not pretty.
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*/
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#ifndef HAVE_ISNAN
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#ifndef isnan
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# define isnan(x) \
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(sizeof (x) == sizeof (long double) ? isnan_ld (x) \
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: sizeof (x) == sizeof (double) ? isnan_d (x) \
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: isnan_f (x))
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static inline int isnan_f (float x) { return x != x; }
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static inline int isnan_d (double x) { return x != x; }
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static inline int isnan_ld (long double x) { return x != x; }
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#endif
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#endif
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#ifndef HAVE_ISINF
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#ifndef isinf
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# define isinf(x) \
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(sizeof (x) == sizeof (long double) ? isinf_ld (x) \
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: sizeof (x) == sizeof (double) ? isinf_d (x) \
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: isinf_f (x))
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static inline int isinf_f (float x) { return isnan (x - x); }
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static inline int isinf_d (double x) { return isnan (x - x); }
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static inline int isinf_ld (long double x) { return isnan (x - x); }
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#endif
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#endif
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