include/c99_math.h

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  27
  28 /**
  29  * Wrapper for math.h which makes sure we have definitions of all the c99
  30  * functions.
  31  */
  32
  33
  34 #ifndef _C99_MATH_H_
  35 #define _C99_MATH_H_
  36
  37 #include <math.h>
  38 #include "c99_compat.h"
  39
  40
  41 #if defined(_MSC_VER)
  42
  43 /* This is to ensure that we get M_PI, etc. definitions */
  44 #if !defined(_USE_MATH_DEFINES)
  45 #error _USE_MATH_DEFINES define required when building with MSVC
  46 #endif
  47
  48 #if _MSC_VER < 1800
  49 #define isfinite(x) _finite((double)(x))
  50 #define isnan(x) _isnan((double)(x))
  51 #endif /* _MSC_VER < 1800 */
  52
  53 #if _MSC_VER < 1800
  54 static inline double log2( double x )
  55 {
  56    const double invln2 = 1.442695041;
  57    return log( x ) * invln2;
  58 }
  59
  60 static inline double
  61 round(double x)
  62 {
  63    return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5);
  64 }
  65
  66 static inline float
  67 roundf(float x)
  68 {
  69    return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
  70 }
  71 #endif
  72
  73 #ifndef INFINITY
  74 #define INFINITY (DBL_MAX + DBL_MAX)
  75 #endif
  76
  77 #ifndef NAN
  78 #define NAN (INFINITY - INFINITY)
  79 #endif
  80
  81 #endif /* _MSC_VER */
  82
  83
  84 #if __STDC_VERSION__ < 199901L && (!defined(__cplusplus) || defined(_MSC_VER))
  85 static inline long int
  86 lrint(double d)
  87 {
  88    long int rounded = (long int)(d + 0.5);
  89
  90    if (d - floor(d) == 0.5) {
  91       if (rounded % 2 != 0)
  92          rounded += (d > 0) ? -1 : 1;
  93    }
  94
  95    return rounded;
  96 }
  97
  98 static inline long int
  99 lrintf(float f)
 100 {
 101    long int rounded = (long int)(f + 0.5f);
 102
 103    if (f - floorf(f) == 0.5f) {
 104       if (rounded % 2 != 0)
 105          rounded += (f > 0) ? -1 : 1;
 106    }
 107
 108    return rounded;
 109 }
 110
 111 static inline long long int
 112 llrint(double d)
 113 {
 114    long long int rounded = (long long int)(d + 0.5);
 115
 116    if (d - floor(d) == 0.5) {
 117       if (rounded % 2 != 0)
 118          rounded += (d > 0) ? -1 : 1;
 119    }
 120
 121    return rounded;
 122 }
 123
 124 static inline long long int
 125 llrintf(float f)
 126 {
 127    long long int rounded = (long long int)(f + 0.5f);
 128
 129    if (f - floorf(f) == 0.5f) {
 130       if (rounded % 2 != 0)
 131          rounded += (f > 0) ? -1 : 1;
 132    }
 133
 134    return rounded;
 135 }
 136 #endif /* C99 */
 137
 138
 139 /*
 140  * signbit() is a macro on Linux.  Not available on Windows.
 141  */
 142 #ifndef signbit
 143 #define signbit(x) ((x) < 0.0f)
 144 #endif
 145
 146
 147 #endif /* #define _C99_MATH_H_ */