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/**
 * Wrapper for math.h which makes sure we have definitions of all the c99
 * functions.
 */


#ifndef _C99_MATH_H_
#define _C99_MATH_H_

#include <math.h>
#include "c99_compat.h"


#if defined(_MSC_VER)

#if _MSC_VER < 1800
#define isfinite(x) _finite((double)(x))
#define isnan(x) _isnan((double)(x))
#endif /* _MSC_VER < 1800 */

#if _MSC_VER < 1800
static inline double log2( double x )
{
   const double invln2 = 1.442695041;
   return log( x ) * invln2;
}

static inline double
round(double x)
{
   return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5);
}

static inline float
roundf(float x)
{
   return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
}
#endif

#ifndef INFINITY
#define INFINITY (DBL_MAX + DBL_MAX)
#endif

#ifndef NAN
#define NAN (INFINITY - INFINITY)
#endif

#endif /* _MSC_VER */


#if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || defined(_MSC_VER))
static inline long int
lrint(double d)
{
   long int rounded = (long int)(d + 0.5);

   if (d - floor(d) == 0.5) {
      if (rounded % 2 != 0)
         rounded += (d > 0) ? -1 : 1;
   }

   return rounded;
}

static inline long int
lrintf(float f)
{
   long int rounded = (long int)(f + 0.5f);

   if (f - floorf(f) == 0.5f) {
      if (rounded % 2 != 0)
         rounded += (f > 0) ? -1 : 1;
   }

   return rounded;
}

static inline long long int
llrint(double d)
{
   long long int rounded = (long long int)(d + 0.5);

   if (d - floor(d) == 0.5) {
      if (rounded % 2 != 0)
         rounded += (d > 0) ? -1 : 1;
   }

   return rounded;
}

static inline long long int
llrintf(float f)
{
   long long int rounded = (long long int)(f + 0.5f);

   if (f - floorf(f) == 0.5f) {
      if (rounded % 2 != 0)
         rounded += (f > 0) ? -1 : 1;
   }

   return rounded;
}
#endif /* C99 */


/*
 * signbit() is a macro on Linux.  Not available on Windows.
 */
#ifndef signbit
#define signbit(x) ((x) < 0.0f)
#endif


#endif /* #define _C99_MATH_H_ */