math_compat.h - mozsearch

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#ifndef __math_compat_h

#define __math_compat_h

/**

 * @file

 * @brief Do not use, json-c internal, may be changed or removed at any time.

*/

/* Define isnan, isinf, infinity and nan on Windows/MSVC */

#ifndef HAVE_DECL_ISNAN

#ifdef HAVE_DECL__ISNAN

#include <float.h>

#define isnan(x) _isnan(x)

#else

/* On platforms like AIX and "IBM i" we need to provide our own isnan */

#define isnan(x) ((x) != (x))

#endif

#endif

#ifndef HAVE_DECL_ISINF

#ifdef HAVE_DECL__FINITE

#include <float.h>

#define isinf(x) (!_finite(x))

#else

#include <float.h>

/* On platforms like AIX and "IBM i" we need to provide our own isinf */

#define isinf(x) ((x) < -DBL_MAX || (x) > DBL_MAX)

#endif

#endif

#ifndef HAVE_DECL_INFINITY

#include <float.h>

#define INFINITY (DBL_MAX + DBL_MAX)

#define HAVE_DECL_INFINITY

#endif

#ifndef HAVE_DECL_NAN

#define NAN (INFINITY - INFINITY)

#define HAVE_DECL_NAN

#endif

#endif