/* * Copyright 2001-2006, Haiku. * Distributed under the terms of the MIT License. */ #ifndef _MATH_H_ #define _MATH_H_ #define M_E 2.7182818284590452354 /* e */ #define M_LOG2E 1.4426950408889634074 /* log 2e */ #define M_LOG10E 0.43429448190325182765 /* log 10e */ #define M_LN2 0.69314718055994530942 /* log e2 */ #define M_LN10 2.30258509299404568402 /* log e10 */ #define M_PI 3.14159265358979323846 /* pi */ #define M_PI_2 1.57079632679489661923 /* pi/2 */ #define M_PI_4 0.78539816339744830962 /* pi/4 */ #define M_1_PI 0.31830988618379067154 /* 1/pi */ #define M_2_PI 0.63661977236758134308 /* 2/pi */ #define M_2_SQRTPI 1.12837916709551257390 /* 2/sqrt(pi) */ #define M_SQRT2 1.41421356237309504880 /* sqrt(2) */ #define M_SQRT1_2 0.70710678118654752440 /* 1/sqrt(2) */ #define PI M_PI #define PI2 M_PI_2 /* platform independent IEEE floating point special values */ #define __HUGE_VAL_v 0x7ff0000000000000LL #define __huge_val_t union { unsigned char __c[8]; long long __ll; double __d; } #ifndef HUGE_VAL # define HUGE_VAL (((__huge_val_t) { __ll: __HUGE_VAL_v }).__d) #endif #define __HUGE_VALF_v 0x7f800000L #define __huge_valf_t union { unsigned char __c[4]; long __l; float __f; } #define HUGE_VALF (((__huge_valf_t) { __l: __HUGE_VALF_v }).__f) /* ToDo: define HUGE_VALL for long doubles */ #define __NAN_VALF_v 0x7fc00000L #define NAN (((__huge_valf_t) { __l: __NAN_VALF_v }).__f) #define INFINITY HUGE_VALF /* floating-point categories */ #define FP_NAN 0 #define FP_INFINITE 1 #define FP_ZERO 2 #define FP_SUBNORMAL 3 #define FP_NORMAL 4 #ifdef __cplusplus struct __exception; extern "C" int matherr(struct __exception *); struct __exception { #else struct exception; extern int matherr(struct exception *); struct exception { #endif int type; char *name; double arg1; double arg2; double retval; }; #define DOMAIN 1 #define SING 2 #define OVERFLOW 3 #define UNDERFLOW 4 #define TLOSS 5 #define PLOSS 6 extern int signgam; #ifdef __cplusplus extern "C" { #endif /* float math functions */ extern float acosf(float x); extern float acoshf(float x); extern float asinf(float x); extern float asinhf(float x); extern float atan2f(float y, float x); extern float atanf(float x); extern float atanhf(float x); extern float cbrtf(float x); extern float ceilf(float x); extern float cosf(float x); extern float coshf(float x); extern float expf(float x); extern float expm1f(float x); extern float fabsf(float x); extern float floorf(float x); extern float fmodf(float x, float y); extern float frexpf(float x, int *_exponent); extern float gammaf(float x); extern float hypotf(float x, float y); extern float ldexpf(float x, int exponent); extern float lgammaf(float x); extern float log10f(float x); extern float log1pf(float x); extern float logbf(float x); extern float logf(float x); extern long lroundf(float x); extern float modff(float x, float *y); extern float nearbyintf(float x); extern float powf(float x, float y); extern float remquof(float x, float y, int *quo); extern float roundf(float x); extern float sinf(float x); extern float sinhf(float x); extern float sqrtf(float x); extern float tanf(float x); extern float tanhf(float x); /* double math functions */ extern double acos(double x); extern double acosh(double x); extern double asin(double x); extern double asinh(double x); extern double atan(double x); extern double atan2(double x, double y); extern double atanh(double x); extern double ceil(double x); extern double cos(double x); extern double cosh(double x); extern double exp(double x); extern double fabs(double x); extern double floor(double x); extern double fmod(double x, double y); extern double frexp(double x, int *_exponent); extern double gamma(double x); extern double ldexp(double x, int exponent); extern double lgamma(double x); extern double log(double x); extern double log10(double x); extern long lround(double x); extern double modf(double x, double *y); extern double nearbyint(double x); extern double pow(double x, double y); extern double remquo(double x, double y, int *quo); extern double round(double x); extern double sin(double x); extern double sinh(double x); extern double sqrt(double x); extern double tan(double x); extern double tanh(double x); extern double trunc(double x); /* long double math functions */ extern long double acosl(long double x); extern long double acoshl(long double x); extern long double asinl(long double x); extern long double atanl(long double x); extern long double atanhl(long double x); extern long double atan2l(long double y, long double x); extern long double lgammal(long double x); extern long double nearbyintl(long double x); extern long double roundl(long double x); extern long lroundl(long double x); extern long double remquol(long double x, long double y, int *quo); /* some BSD non-ANSI or POSIX math functions */ extern double cbrt(double x); extern double erf(double x); extern double erfc(double x); extern double expm1(double x); extern double gamma_r(double x, int *y); extern double hypot(double x, double y); extern int ilogb(double x); extern double j0(double x); extern double j1(double x); extern double jn(int x, double y); extern double lgamma_r(double x, int *y); extern double log1p(double x); extern double logb(double x); extern double nextafter(double x, double y); extern double nexttoward(double x, long double y); extern double remainder(double x, double y); extern double rint(double x); extern double scalb (double x, double y); extern double y0(double x); extern double y1(double x); extern double yn(int x, double y); /* other stuff as defined in BeOS */ extern int isinff(float value); extern int finitef(float value); extern float dremf(float x, float y); extern float significandf(float x); extern float copysignf(float x, float y); extern int isnanf(float value); extern double significand(double x); extern double copysign(double x, double y); extern double scalbln(double x, long n); extern double scalbn(double x, int y); extern double drem(double x, double y); extern int finite(double x); extern float j0f(float x); extern float j1f(float x); extern float jnf(int x, float y); extern float y0f(float x); extern float y1f(float x); extern float ynf(int x, float y); extern float erff(float x); extern float erfcf(float x); extern float gammaf_r(float x, int *y); extern float lgammaf_r(float x, int *y); extern float rintf(float x); extern float nextafterf(float x, float y); extern float nexttowardf(float x, long double y); extern float remainderf(float x, float y); extern float scalbf(float x, float n); extern float scalbnf(float x, int n); extern int ilogbf(float x); extern long double nextafterl(long double x, long double y); extern long double nexttowardl(long double x, long double y); extern long double remainderl(long double x, long double y); extern long double rintl(long double x); extern long double scalbnl(long double x, int n); extern long double scalblnl(long double x, long n); /* prototypes for functions used in the macros below */ extern int __fpclassifyf(float value); extern int __signbitf(float value); extern int __finitef(float value); extern int __isnanf(float value); extern int __isinff(float value); extern int __fpclassifyl(long double value); extern int __signbitl(long double value); extern int __finitel(long double value); extern int __isnanl(long double value); extern int __isinfl(long double value); extern int __fpclassify(double value); extern int __signbit(double value); extern int __finite(double value); extern int __isnan(double value); extern int __isinf(double value); /* returns number of classification appropriate for 'value' */ #define fpclassify(value) \ (sizeof(value) == sizeof(float) ? __fpclassifyf(value) \ : sizeof(value) == sizeof(double) ? __fpclassify(value) \ : __fpclassifyl(value)) /* returns non-zero if 'value' is negative */ # define signbit(value) \ (sizeof(value) == sizeof(float) ? __signbitf(value) \ : sizeof(value) == sizeof(double) ? __signbit(value) \ : __signbitl(value)) /* returns non-zero if 'value' is not Inf or NaN */ # define isfinite(value) \ (sizeof(value) == sizeof(float) ? __finitef(value) \ : sizeof(value) == sizeof(double) ? __finite(value) \ : __finitel(value)) /* returns non-zero if 'value' is neither zero, sub-normal, Inf, nor NaN */ # define isnormal(value) \ (fpclassify(value) == FP_NORMAL) /* returns non-zero if 'value' is NaN */ # define isnan(value) \ (sizeof(value) == sizeof(float) ? __isnanf(value) \ : sizeof(value) == sizeof(double) ? __isnan(value) \ : __isnanl(value)) /* returns non-zero if 'value is Inf */ # define isinf(value) \ (sizeof(value) == sizeof(float) ? __isinff(value) \ : sizeof(value) == sizeof(double) ? __isinf(value) \ : __isinfl(value)) #ifdef __cplusplus } #endif #endif /* _MATH_H_ */