зеркало из https://github.com/github/ruby.git
279 строки
9.2 KiB
C
279 строки
9.2 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 RUBY_BIG_DECIMAL_H
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#define RUBY_BIG_DECIMAL_H 1
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#include "ruby/ruby.h"
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#include <float.h>
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#if defined(__cplusplus)
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extern "C" {
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#endif
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#ifndef HAVE_LABS
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static inline long
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labs(long const x)
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{
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if (x < 0) return -x;
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return x;
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}
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#endif
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#ifndef HAVE_LLABS
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static inline LONG_LONG
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llabs(LONG_LONG const x)
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{
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if (x < 0) return -x;
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return x;
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}
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#endif
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#ifdef vabs
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# undef vabs
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#endif
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#if SIZEOF_VALUE <= SIZEOF_INT
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# define vabs abs
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#elif SIZEOF_VALUE <= SIZEOF_LONG
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# define vabs labs
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#elif SIZEOF_VALUE <= SIZEOF_LONG_LONG
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# define vabs llabs
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#endif
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extern VALUE rb_cBigDecimal;
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#if 0 || SIZEOF_BDIGITS >= 16
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# define RMPD_COMPONENT_FIGURES 38
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# define RMPD_BASE ((BDIGIT)100000000000000000000000000000000000000U)
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#elif SIZEOF_BDIGITS >= 8
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# define RMPD_COMPONENT_FIGURES 19
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# define RMPD_BASE ((BDIGIT)10000000000000000000U)
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#elif SIZEOF_BDIGITS >= 4
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# define RMPD_COMPONENT_FIGURES 9
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# define RMPD_BASE ((BDIGIT)1000000000U)
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#elif SIZEOF_BDIGITS >= 2
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# define RMPD_COMPONENT_FIGURES 4
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# define RMPD_BASE ((BDIGIT)10000U)
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#else
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# define RMPD_COMPONENT_FIGURES 2
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# define RMPD_BASE ((BDIGIT)100U)
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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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/* 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)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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#define RMPD_EXCEPTION_MODE_DEFAULT 0U
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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 RMPD_ROUNDING_MODE_DEFAULT VP_ROUND_HALF_UP
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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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size_t 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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size_t 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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SIGNED_VALUE 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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BDIGIT 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(size_t mx, char *str, VALUE klass);
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VP_EXPORT Real *VpCreateRbObject(size_t mx,const char *str);
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static inline BDIGIT
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rmpd_base_value(void) { return RMPD_BASE; }
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static inline size_t
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rmpd_component_figures(void) { return RMPD_COMPONENT_FIGURES; }
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static inline size_t
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rmpd_double_figures(void) { return 1+DBL_DIG; }
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#define VpBaseFig() rmpd_component_figures()
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#define VpDblFig() rmpd_double_figures()
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#define VpBaseVal() rmpd_base_value()
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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 size_t VpGetPrecLimit(void);
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VP_EXPORT size_t VpSetPrecLimit(size_t n);
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/* Round mode */
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VP_EXPORT int VpIsRoundMode(unsigned short n);
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VP_EXPORT unsigned short VpGetRoundMode(void);
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VP_EXPORT unsigned short VpSetRoundMode(unsigned short n);
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VP_EXPORT int VpException(unsigned short f,const char *str,int always);
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#if 0 /* unused */
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VP_EXPORT int VpIsNegDoubleZero(double v);
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#endif
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VP_EXPORT size_t VpNumOfChars(Real *vp,const char *pszFmt);
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VP_EXPORT size_t VpInit(BDIGIT BaseVal);
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VP_EXPORT void *VpMemAlloc(size_t mb);
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VP_EXPORT void VpFree(Real *pv);
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VP_EXPORT Real *VpAlloc(size_t mx, const char *szVal);
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VP_EXPORT size_t VpAsgn(Real *c, Real *a, int isw);
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VP_EXPORT size_t VpAddSub(Real *c,Real *a,Real *b,int operation);
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VP_EXPORT size_t VpMult(Real *c,Real *a,Real *b);
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VP_EXPORT size_t 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 ssize_t VpExponent10(Real *a);
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VP_EXPORT void VpSzMantissa(Real *a,char *psz);
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VP_EXPORT int VpToSpecialString(Real *a,char *psz,int fPlus);
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VP_EXPORT void VpToString(Real *a, char *psz, size_t fFmt, int fPlus);
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VP_EXPORT void VpToFString(Real *a, char *psz, size_t fFmt, int fPlus);
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VP_EXPORT int VpCtoV(Real *a, const char *int_chr, size_t ni, const char *frac, size_t nf, const char *exp_chr, size_t ne);
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VP_EXPORT int VpVtoD(double *d, SIGNED_VALUE *e, Real *m);
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VP_EXPORT void VpDtoV(Real *m,double d);
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#if 0 /* unused */
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VP_EXPORT void VpItoV(Real *m,S_INT ival);
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#endif
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VP_EXPORT int VpSqrt(Real *y,Real *x);
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VP_EXPORT int VpActiveRound(Real *y, Real *x, unsigned short f, ssize_t il);
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VP_EXPORT int VpMidRound(Real *y, unsigned short f, ssize_t nf);
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VP_EXPORT int VpLeftRound(Real *y, unsigned short f, ssize_t 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, SIGNED_VALUE n);
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/* VP constants */
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VP_EXPORT Real *VpOne(void);
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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((ssize_t)(a)->sign);else (a)->sign=-(short)Abs((ssize_t)(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)->Prec=(a)->exponent=(a)->frac[0]=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 VpHasVal(a) (a->frac[0])
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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 BIGDECIMAL_DEBUG
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int VpVarCheck(Real * v);
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VP_EXPORT int VPrint(FILE *fp,const char *cntl_chr,Real *a);
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#endif /* BIGDECIMAL_DEBUG */
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#if defined(__cplusplus)
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} /* extern "C" { */
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#endif
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#endif /* RUBY_BIG_DECIMAL_H */
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