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4cbf09d1fe
ROUND_MODE & round changed(source & docs). git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@4187 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
213 lines
7.7 KiB
C
213 lines
7.7 KiB
C
/*
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*
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* Ruby BigDecimal(Variable decimal precision) extension library.
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*
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* Copyright(C) 2002 by Shigeo Kobayashi(shigeo@tinyforest.gr.jp)
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Artistic License, as specified in the README file
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* of this BigDecimal distribution.
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*
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* NOTES:
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* 2003-03-28 V1.0 checked in.
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*
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*/
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#ifndef ____BIG_DECIMAL__H____
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#define ____BIG_DECIMAL__H____
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/*
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* NaN & Infinity
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*/
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#define SZ_NaN "NaN"
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#define SZ_INF "Infinity"
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#define SZ_PINF "+Infinity"
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#define SZ_NINF "+Infinity"
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/*
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* #define VP_EXPORT other than static to let VP_ routines
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* be called from outside of this module.
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*/
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#define VP_EXPORT static
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#define U_LONG unsigned long
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#define S_LONG long
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#define U_INT unsigned int
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#define S_INT int
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/* Exception codes */
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#define VP_EXCEPTION_ALL ((unsigned short)0x00FF)
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#define VP_EXCEPTION_INFINITY ((unsigned short)0x0001)
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#define VP_EXCEPTION_NaN ((unsigned short)0x0002)
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#define VP_EXCEPTION_UNDERFLOW ((unsigned short)0x0004)
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#define VP_EXCEPTION_OVERFLOW ((unsigned short)0x0001) /* 0x0008) */
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#define VP_EXCEPTION_ZERODIVIDE ((unsigned short)0x0001) /* 0x0010) */
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/* Following 2 exceptions cann't controlled by user */
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#define VP_EXCEPTION_OP ((unsigned short)0x0020)
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#define VP_EXCEPTION_MEMORY ((unsigned short)0x0040)
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/* Computation mode */
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#define VP_ROUND_MODE ((unsigned short)0x0100)
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#define VP_ROUND_UP 1
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#define VP_ROUND_DOWN 2
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#define VP_ROUND_HALF_UP 3
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#define VP_ROUND_HALF_DOWN 4
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#define VP_ROUND_CEIL 5
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#define VP_ROUND_FLOOR 6
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#define VP_ROUND_HALF_EVEN 7
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#define VP_SIGN_NaN 0 /* NaN */
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#define VP_SIGN_POSITIVE_ZERO 1 /* Positive zero */
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#define VP_SIGN_NEGATIVE_ZERO -1 /* Negative zero */
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#define VP_SIGN_POSITIVE_FINITE 2 /* Positive finite number */
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#define VP_SIGN_NEGATIVE_FINITE -2 /* Negative finite number */
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#define VP_SIGN_POSITIVE_INFINITE 3 /* Positive infinite number */
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#define VP_SIGN_NEGATIVE_INFINITE -3 /* Negative infinite number */
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/*
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* VP representation
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* r = 0.xxxxxxxxx *BASE**exponent
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*/
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typedef struct {
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VALUE obj; /* Back pointer(VALUE) for Ruby object. */
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U_LONG MaxPrec; /* Maximum precision size */
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/* This is the actual size of pfrac[] */
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/*(frac[0] to frac[MaxPrec] are available). */
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U_LONG Prec; /* Current precision size. */
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/* This indicates how much the. */
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/* the array frac[] is actually used. */
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S_INT exponent;/* Exponent part. */
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short sign; /* Attributes of the value. */
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/*
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* ==0 : NaN
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* 1 : Positive zero
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* -1 : Negative zero
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* 2 : Positive number
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* -2 : Negative number
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* 3 : Positive infinite number
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* -3 : Negative infinite number
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*/
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short flag; /* Not used in vp_routines,space for user. */
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U_LONG frac[1]; /* Pointer to array of fraction part. */
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} Real;
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/*
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* ------------------
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* EXPORTables.
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* ------------------
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*/
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VP_EXPORT Real *
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VpNewRbClass(U_LONG mx,char *str,VALUE klass);
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VP_EXPORT Real *VpCreateRbObject(U_LONG mx,char *str);
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VP_EXPORT U_LONG VpBaseFig(void);
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VP_EXPORT U_LONG VpDblFig(void);
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VP_EXPORT U_LONG VpBaseVal(void);
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/* Zero,Inf,NaN (isinf(),isnan() used to check) */
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VP_EXPORT double VpGetDoubleNaN(void);
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VP_EXPORT double VpGetDoublePosInf(void);
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VP_EXPORT double VpGetDoubleNegInf(void);
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VP_EXPORT double VpGetDoubleNegZero(void);
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/* These 2 functions added at v1.1.7 */
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VP_EXPORT U_LONG VpGetPrecLimit(void);
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VP_EXPORT U_LONG VpSetPrecLimit(U_LONG n);
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/* Round mode */
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VP_EXPORT unsigned long VpGetRoundMode(void);
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VP_EXPORT unsigned long VpSetRoundMode(unsigned long n);
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VP_EXPORT int VpException(unsigned short f,char *str,int always);
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VP_EXPORT int VpIsNegDoubleZero(double v);
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VP_EXPORT U_LONG VpNumOfChars(Real *vp);
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VP_EXPORT U_LONG VpInit(U_LONG BaseVal);
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VP_EXPORT void *VpMemAlloc(U_LONG mb);
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VP_EXPORT void VpFree(Real *pv);
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VP_EXPORT Real *VpAlloc(U_LONG mx, char *szVal);
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VP_EXPORT int VpAsgn(Real *c,Real *a,int isw);
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VP_EXPORT int VpAddSub(Real *c,Real *a,Real *b,int operation);
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VP_EXPORT int VpMult(Real *c,Real *a,Real *b);
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VP_EXPORT int VpDivd(Real *c,Real *r,Real *a,Real *b);
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VP_EXPORT int VpComp(Real *a,Real *b);
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VP_EXPORT S_LONG VpExponent10(Real *a);
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VP_EXPORT void VpSzMantissa(Real *a,char *psz);
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VP_EXPORT void VpToString(Real *a,char *psz,int fFmt);
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VP_EXPORT int VpCtoV(Real *a,char *int_chr,U_LONG ni,char *frac,U_LONG nf,char *exp_chr,U_LONG ne);
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VP_EXPORT int VpVtoD(double *d,S_LONG *e,Real *m);
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VP_EXPORT void VpDtoV(Real *m,double d);
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VP_EXPORT void VpItoV(Real *m,S_INT ival);
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VP_EXPORT int VpSqrt(Real *y,Real *x);
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VP_EXPORT void VpActiveRound(Real *y,Real *x,int f,int il);
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VP_EXPORT void VpMidRound(Real *y, int f, int nf);
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VP_EXPORT void VpLeftRound(Real *y, int f, int nf);
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VP_EXPORT void VpFrac(Real *y,Real *x);
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VP_EXPORT int VpPower(Real *y,Real *x,S_INT n);
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VP_EXPORT void VpPi(Real *y);
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VP_EXPORT void VpExp1(Real *y);
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VP_EXPORT void VpExp(Real *y,Real *x);
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VP_EXPORT void VpSinCos(Real *psin,Real *pcos,Real *x);
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/*
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* ------------------
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* MACRO definitions.
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* ------------------
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*/
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#define Abs(a) (((a)>= 0)?(a):(-(a)))
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#define Max(a, b) (((a)>(b))?(a):(b))
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#define Min(a, b) (((a)>(b))?(b):(a))
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#define VpMaxPrec(a) ((a)->MaxPrec)
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#define VpPrec(a) ((a)->Prec)
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#define VpGetFlag(a) ((a)->flag)
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/* Sign */
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/* VpGetSign(a) returns 1,-1 if a>0,a<0 respectively */
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#define VpGetSign(a) (((a)->sign>0)?1:(-1))
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/* Change sign of a to a>0,a<0 if s = 1,-1 respectively */
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#define VpChangeSign(a,s) {if((s)>0) (a)->sign=(short)Abs((S_LONG)(a)->sign);else (a)->sign=-(short)Abs((S_LONG)(a)->sign);}
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/* Sets sign of a to a>0,a<0 if s = 1,-1 respectively */
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#define VpSetSign(a,s) {if((s)>0) (a)->sign=(short)VP_SIGN_POSITIVE_FINITE;else (a)->sign=(short)VP_SIGN_NEGATIVE_FINITE;}
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/* 1 */
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#define VpSetOne(a) {(a)->frac[0]=(a)->exponent=(a)->Prec=1;(a)->sign=VP_SIGN_POSITIVE_FINITE;}
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/* ZEROs */
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#define VpIsPosZero(a) ((a)->sign==VP_SIGN_POSITIVE_ZERO)
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#define VpIsNegZero(a) ((a)->sign==VP_SIGN_NEGATIVE_ZERO)
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#define VpIsZero(a) (VpIsPosZero(a) || VpIsNegZero(a))
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#define VpSetPosZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_ZERO)
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#define VpSetNegZero(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_ZERO)
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#define VpSetZero(a,s) ( ((s)>0)?VpSetPosZero(a):VpSetNegZero(a) )
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/* NaN */
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#define VpIsNaN(a) ((a)->sign==VP_SIGN_NaN)
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#define VpSetNaN(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NaN)
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/* Infinity */
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#define VpIsPosInf(a) ((a)->sign==VP_SIGN_POSITIVE_INFINITE)
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#define VpIsNegInf(a) ((a)->sign==VP_SIGN_NEGATIVE_INFINITE)
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#define VpIsInf(a) (VpIsPosInf(a) || VpIsNegInf(a))
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#define VpIsDef(a) ( !(VpIsNaN(a)||VpIsInf(a)) )
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#define VpSetPosInf(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_POSITIVE_INFINITE)
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#define VpSetNegInf(a) ((a)->frac[0]=0,(a)->Prec=1,(a)->sign=VP_SIGN_NEGATIVE_INFINITE)
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#define VpSetInf(a,s) ( ((s)>0)?VpSetPosInf(a):VpSetNegInf(a) )
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#define VpIsOne(a) ((a->Prec==1)&&(a->frac[0]==1)&&(a->exponent==1))
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#define VpExponent(a) (a->exponent)
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#ifdef _DEBUG
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int VpVarCheck(Real * v);
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VP_EXPORT int VPrint(FILE *fp,char *cntl_chr,Real *a);
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#endif /* _DEBUG */
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#if defined(__cplusplus)
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} /* extern "C" { */
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#endif
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#endif //____BIG_DECIMAL__H____
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