/* ![[previous]](../icons/n_left.png)
![[next]](../icons/n_right.png)
![[first]](../icons/first.png)
![[last]](../icons/n_last.png)
![[top]](../icons/n_top.png)
![[bottom]](../icons/bottom.png)
![[index]](../icons/index.png)
![[help]](../icons/help.png)
*/
DEFINITIONS
This source file includes following definitions.
- Real
/*
*
* Ruby BigDecimal(Variable decimal precision) extension library.
*
* Copyright(C) 2002 by Shigeo Kobayashi(shigeo@tinyforest.gr.jp)
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file
* of this BigDecimal distribution.
*
* NOTES:
* 2003-03-28 V1.0 checked in.
*
*/
#ifndef ____BIG_DECIMAL__H____
#define ____BIG_DECIMAL__H____
#if defined(__cplusplus)
extern "C" {
#endif
/*
* NaN & Infinity
*/
#define SZ_NaN "NaN"
#define SZ_INF "Infinity"
#define SZ_PINF "+Infinity"
#define SZ_NINF "-Infinity"
/*
* #define VP_EXPORT other than static to let VP_ routines
* be called from outside of this module.
*/
#define VP_EXPORT static
#define U_LONG unsigned long
#define S_LONG long
#define U_INT unsigned int
#define S_INT int
/* Exception codes */
#define VP_EXCEPTION_ALL ((unsigned short)0x00FF)
#define VP_EXCEPTION_INFINITY ((unsigned short)0x0001)
#define VP_EXCEPTION_NaN ((unsigned short)0x0002)
#define VP_EXCEPTION_UNDERFLOW ((unsigned short)0x0004)
#define VP_EXCEPTION_OVERFLOW ((unsigned short)0x0001) /* 0x0008) */
#define VP_EXCEPTION_ZERODIVIDE ((unsigned short)0x0010)
/* Following 2 exceptions cann't controlled by user */
#define VP_EXCEPTION_OP ((unsigned short)0x0020)
#define VP_EXCEPTION_MEMORY ((unsigned short)0x0040)
/* Computation mode */
#define VP_ROUND_MODE ((unsigned short)0x0100)
#define VP_ROUND_UP 1
#define VP_ROUND_DOWN 2
#define VP_ROUND_HALF_UP 3
#define VP_ROUND_HALF_DOWN 4
#define VP_ROUND_CEIL 5
#define VP_ROUND_FLOOR 6
#define VP_ROUND_HALF_EVEN 7
#define VP_SIGN_NaN 0 /* NaN */
#define VP_SIGN_POSITIVE_ZERO 1 /* Positive zero */
#define VP_SIGN_NEGATIVE_ZERO -1 /* Negative zero */
#define VP_SIGN_POSITIVE_FINITE 2 /* Positive finite number */
#define VP_SIGN_NEGATIVE_FINITE -2 /* Negative finite number */
#define VP_SIGN_POSITIVE_INFINITE 3 /* Positive infinite number */
#define VP_SIGN_NEGATIVE_INFINITE -3 /* Negative infinite number */
/*
* VP representation
* r = 0.xxxxxxxxx *BASE**exponent
*/
typedef struct {
VALUE obj; /* Back pointer(VALUE) for Ruby object. */
U_LONG MaxPrec; /* Maximum precision size */
/* This is the actual size of pfrac[] */
/*(frac[0] to frac[MaxPrec] are available). */
U_LONG Prec; /* Current precision size. */
/* This indicates how much the. */
/* the array frac[] is actually used. */
S_INT exponent;/* Exponent part. */
short sign; /* Attributes of the value. */
/*
* ==0 : NaN
* 1 : Positive zero
* -1 : Negative zero
* 2 : Positive number
* -2 : Negative number
* 3 : Positive infinite number
* -3 : Negative infinite number
*/
short flag; /* Not used in vp_routines,space for user. */
U_LONG frac[1]; /* Pointer to array of fraction part. */
} Real;
/*
* ------------------
* EXPORTables.
* ------------------
*/
VP_EXPORT Real *
VpNewRbClass(U_LONG mx,char *str,VALUE klass);
VP_EXPORT Real *VpCreateRbObject(U_LONG mx,const char *str);
VP_EXPORT U_LONG VpBaseFig(void);
VP_EXPORT U_LONG VpDblFig(void);
VP_EXPORT U_LONG VpBaseVal(void);
/* Zero,Inf,NaN (isinf(),isnan() used to check) */
VP_EXPORT double VpGetDoubleNaN(void);
VP_EXPORT double VpGetDoublePosInf(void);
VP_EXPORT double VpGetDoubleNegInf(void);
VP_EXPORT double VpGetDoubleNegZero(void);
/* These 2 functions added at v1.1.7 */
VP_EXPORT U_LONG VpGetPrecLimit(void);
VP_EXPORT U_LONG VpSetPrecLimit(U_LONG n);
/* Round mode */
VP_EXPORT int VpIsRoundMode(unsigned long n);
VP_EXPORT unsigned long VpGetRoundMode(void);
VP_EXPORT unsigned long VpSetRoundMode(unsigned long n);
VP_EXPORT int VpException(unsigned short f,const char *str,int always);
#if 0 /* unused */
VP_EXPORT int VpIsNegDoubleZero(double v);
#endif
VP_EXPORT U_LONG VpNumOfChars(Real *vp,const char *pszFmt);
VP_EXPORT U_LONG VpInit(U_LONG BaseVal);
VP_EXPORT void *VpMemAlloc(U_LONG mb);
VP_EXPORT void VpFree(Real *pv);
VP_EXPORT Real *VpAlloc(U_LONG mx, const char *szVal);
VP_EXPORT int VpAsgn(Real *c,Real *a,int isw);
VP_EXPORT int VpAddSub(Real *c,Real *a,Real *b,int operation);
VP_EXPORT int VpMult(Real *c,Real *a,Real *b);
VP_EXPORT int VpDivd(Real *c,Real *r,Real *a,Real *b);
VP_EXPORT int VpComp(Real *a,Real *b);
VP_EXPORT S_LONG VpExponent10(Real *a);
VP_EXPORT void VpSzMantissa(Real *a,char *psz);
VP_EXPORT int VpToSpecialString(Real *a,char *psz,int fPlus);
VP_EXPORT void VpToString(Real *a,char *psz,int fFmt,int fPlus);
VP_EXPORT void VpToFString(Real *a,char *psz,int fFmt,int fPlus);
VP_EXPORT int VpCtoV(Real *a,const char *int_chr,U_LONG ni,const char *frac,U_LONG nf,const char *exp_chr,U_LONG ne);
VP_EXPORT int VpVtoD(double *d,S_LONG *e,Real *m);
VP_EXPORT void VpDtoV(Real *m,double d);
#if 0 /* unused */
VP_EXPORT void VpItoV(Real *m,S_INT ival);
#endif
VP_EXPORT int VpSqrt(Real *y,Real *x);
VP_EXPORT int VpActiveRound(Real *y,Real *x,int f,int il);
VP_EXPORT int VpMidRound(Real *y, int f, int nf);
VP_EXPORT int VpLeftRound(Real *y, int f, int nf);
VP_EXPORT void VpFrac(Real *y,Real *x);
VP_EXPORT int VpPower(Real *y,Real *x,S_INT n);
/* VP constants */
VP_EXPORT Real *VpOne(void);
/*
* ------------------
* MACRO definitions.
* ------------------
*/
#define Abs(a) (((a)>= 0)?(a):(-(a)))
#define Max(a, b) (((a)>(b))?(a):(b))
#define Min(a, b) (((a)>(b))?(b):(a))
#define VpMaxPrec(a) ((a)->MaxPrec)
#define VpPrec(a) ((a)->Prec)
#define VpGetFlag(a) ((a)->flag)
/* Sign */
/* VpGetSign(a) returns 1,-1 if a>0,a<0 respectively */
#define VpGetSign(a) (((a)->sign>0)?1:(-1))
/* Change sign of a to a>0,a<0 if s = 1,-1 respectively */
#define VpChangeSign(a,s) {if((s)>0) (a)->sign=(short)Abs((S_LONG)(a)->sign);else (a)->sign=-(short)Abs((S_LONG)(a)->sign);}
/* Sets sign of a to a>0,a<0 if s = 1,-1 respectively */
#define VpSetSign(a,s) {if((s)>0) (a)->sign=(short)VP_SIGN_POSITIVE_FINITE;else (a)->sign=(short)VP_SIGN_NEGATIVE_FINITE;}
/* 1 */
#define VpSetOne(a) {(a)->frac[0]=(a)->exponent=(a)->Prec=1;(a)->sign=VP_SIGN_POSITIVE_FINITE;}
/* ZEROs */
#define VpIsPosZero(a) ((a)->sign==VP_SIGN_POSITIVE_ZERO)
#define VpIsNegZero(a) ((a)->sign==VP_SIGN_NEGATIVE_ZERO)
#define VpIsZero(a) (VpIsPosZero(a) || VpIsNegZero(a))
#define VpSetPosZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_ZERO)
#define VpSetNegZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_ZERO)
#define VpSetZero(a,s) ( ((s)>0)?VpSetPosZero(a):VpSetNegZero(a) )
/* NaN */
#define VpIsNaN(a) ((a)->sign==VP_SIGN_NaN)
#define VpSetNaN(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NaN)
/* Infinity */
#define VpIsPosInf(a) ((a)->sign==VP_SIGN_POSITIVE_INFINITE)
#define VpIsNegInf(a) ((a)->sign==VP_SIGN_NEGATIVE_INFINITE)
#define VpIsInf(a) (VpIsPosInf(a) || VpIsNegInf(a))
#define VpIsDef(a) ( !(VpIsNaN(a)||VpIsInf(a)) )
#define VpSetPosInf(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_INFINITE)
#define VpSetNegInf(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_INFINITE)
#define VpSetInf(a,s) ( ((s)>0)?VpSetPosInf(a):VpSetNegInf(a) )
#define VpHasVal(a) (a->frac[0])
#define VpIsOne(a) ((a->Prec==1)&&(a->frac[0]==1)&&(a->exponent==1))
#define VpExponent(a) (a->exponent)
#ifdef _DEBUG
int VpVarCheck(Real * v);
VP_EXPORT int VPrint(FILE *fp,char *cntl_chr,Real *a);
#endif /* _DEBUG */
#if defined(__cplusplus)
} /* extern "C" { */
#endif
#endif /* ____BIG_DECIMAL__H____ */
![[first]](../icons/n_first.png){kind=icon}
![[last]](../icons/last.png){kind=icon}
![[top]](../icons/top.png){kind=icon}
![[bottom]](../icons/n_bottom.png){kind=icon}