/*

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

 */

/*

 * Copyright (C) 2009 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, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

 */

/*

 * 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