floatmagic.h - master - niceSOFT/gawk

/*
 * floatmagic.h -- Definitions of isnan and isinf for gawk.
 */

/*
 * Copyright (C) 2009, 2026 the Free Software Foundation, Inc.
 *
 * This file is part of GAWK, the GNU implementation of the
 * AWK Programming Language.
 *
 * GAWK is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * GAWK 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

/*
 * NOTE: <math.h> MUST be included before this file. Also <config.h>.
 *
 * These definitions are taken from the Autoconf 2.63 manual. Not pretty.
 */

#ifndef HAVE_ISNAN
#ifndef isnan
# define isnan(x) \
    (sizeof (x) == sizeof (long double) ? isnan_ld (x) \
     : sizeof (x) == sizeof (double) ? isnan_d (x) \
     : isnan_f (x))
static inline int isnan_f  (float       x) { return x != x; }
static inline int isnan_d  (double      x) { return x != x; }
static inline int isnan_ld (long double x) { return x != x; }
#endif
#endif

#ifndef HAVE_ISINF
#ifndef isinf
# define isinf(x) \
    (sizeof (x) == sizeof (long double) ? isinf_ld (x) \
     : sizeof (x) == sizeof (double) ? isinf_d (x) \
     : isinf_f (x))
static inline int isinf_f  (float       x) { return isnan (x - x); }
static inline int isinf_d  (double      x) { return isnan (x - x); }
static inline int isinf_ld (long double x) { return isnan (x - x); }
#endif
#endif