summaryrefslogtreecommitdiff
path: root/ext/bigdecimal/bigdecimal.h
blob: eb10ae3f94fcfff2f0da415d1bdd74e60b310720 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
/*
 *
 * 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  RUBY_BIG_DECIMAL_H
#define  RUBY_BIG_DECIMAL_H 1

#include "ruby/ruby.h"
#include <float.h>

#if defined(__cplusplus)
extern "C" {
#endif

#ifndef HAVE_LABS
static inline long
labs(long const x)
{
    if (x < 0) return -x;
    return x;
}
#endif

#ifndef HAVE_LLABS
static inline LONG_LONG
llabs(LONG_LONG const x)
{
    if (x < 0) return -x;
    return x;
}
#endif

#ifdef vabs
# undef vabs
#endif
#if SIZEOF_VALUE <= SIZEOF_INT
# define vabs abs
#elif SIZEOF_VALUE <= SIZEOF_LONG
# define vabs labs
#elif SIZEOF_VALUE <= SIZEOF_LONG_LONG
# define vabs llabs
#endif

extern VALUE rb_cBigDecimal;

#if 0 || SIZEOF_BDIGITS >= 16
# define RMPD_COMPONENT_FIGURES 38
# define RMPD_BASE ((BDIGIT)100000000000000000000000000000000000000U)
#elif SIZEOF_BDIGITS >= 8
# define RMPD_COMPONENT_FIGURES 19
# define RMPD_BASE ((BDIGIT)10000000000000000000U)
#elif SIZEOF_BDIGITS >= 4
# define RMPD_COMPONENT_FIGURES 9
# define RMPD_BASE ((BDIGIT)1000000000U)
#elif SIZEOF_BDIGITS >= 2
# define RMPD_COMPONENT_FIGURES 4
# define RMPD_BASE ((BDIGIT)10000U)
#else
# define RMPD_COMPONENT_FIGURES 2
# define RMPD_BASE ((BDIGIT)100U)
#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

/* 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)

#define RMPD_EXCEPTION_MODE_DEFAULT 0U

/* 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 RMPD_ROUNDING_MODE_DEFAULT  VP_ROUND_HALF_UP

#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 */

#ifdef __GNUC__
#define	FLEXIBLE_ARRAY_SIZE 0
#else
#define	FLEXIBLE_ARRAY_SIZE 1
#endif

/*
 * VP representation
 *  r = 0.xxxxxxxxx *BASE**exponent
 */
typedef struct {
    VALUE  obj;     /* Back pointer(VALUE) for Ruby object.     */
    size_t MaxPrec; /* Maximum precision size                   */
                    /* This is the actual size of pfrac[]       */
                    /*(frac[0] to frac[MaxPrec] are available). */
    size_t Prec;    /* Current precision size.                  */
                    /* This indicates how much the.             */
                    /* the array frac[] is actually used.       */
    SIGNED_VALUE 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.  */
    BDIGIT frac[FLEXIBLE_ARRAY_SIZE]; /* Array of fraction part. */
} Real;

/*
 *  ------------------
 *   EXPORTables.
 *  ------------------
 */

VP_EXPORT  Real *
VpNewRbClass(size_t mx, char const *str, VALUE klass);

VP_EXPORT  Real *VpCreateRbObject(size_t mx,const char *str);

static inline BDIGIT
rmpd_base_value(void) { return RMPD_BASE; }
static inline size_t
rmpd_component_figures(void) { return RMPD_COMPONENT_FIGURES; }
static inline size_t
rmpd_double_figures(void) { return 1+DBL_DIG; }

#define VpBaseFig() rmpd_component_figures()
#define VpDblFig() rmpd_double_figures()
#define VpBaseVal() rmpd_base_value()

/* 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 size_t VpGetPrecLimit(void);
VP_EXPORT size_t VpSetPrecLimit(size_t n);

/* Round mode */
VP_EXPORT int            VpIsRoundMode(unsigned short n);
VP_EXPORT unsigned short VpGetRoundMode(void);
VP_EXPORT unsigned short VpSetRoundMode(unsigned short 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 size_t VpNumOfChars(Real *vp,const char *pszFmt);
VP_EXPORT size_t VpInit(BDIGIT BaseVal);
VP_EXPORT void *VpMemAlloc(size_t mb);
VP_EXPORT void *VpMemRealloc(void *ptr, size_t mb);
VP_EXPORT void VpFree(Real *pv);
VP_EXPORT Real *VpAlloc(size_t mx, const char *szVal);
VP_EXPORT size_t VpAsgn(Real *c, Real *a, int isw);
VP_EXPORT size_t VpAddSub(Real *c,Real *a,Real *b,int operation);
VP_EXPORT size_t VpMult(Real *c,Real *a,Real *b);
VP_EXPORT size_t VpDivd(Real *c,Real *r,Real *a,Real *b);
VP_EXPORT int VpComp(Real *a,Real *b);
VP_EXPORT ssize_t 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, size_t fFmt, int fPlus);
VP_EXPORT void VpToFString(Real *a, char *psz, size_t fFmt, int fPlus);
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);
VP_EXPORT int VpVtoD(double *d, SIGNED_VALUE *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, unsigned short f, ssize_t il);
VP_EXPORT int VpMidRound(Real *y, unsigned short f, ssize_t nf);
VP_EXPORT int VpLeftRound(Real *y, unsigned short f, ssize_t nf);
VP_EXPORT void VpFrac(Real *y, Real *x);
VP_EXPORT int VpPower(Real *y, Real *x, SIGNED_VALUE 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((ssize_t)(a)->sign);else (a)->sign=-(short)Abs((ssize_t)(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)->Prec=(a)->exponent=(a)->frac[0]=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 BIGDECIMAL_DEBUG
int VpVarCheck(Real * v);
VP_EXPORT int VPrint(FILE *fp,const char *cntl_chr,Real *a);
#endif /* BIGDECIMAL_DEBUG */

#if defined(__cplusplus)
}  /* extern "C" { */
#endif
#endif /* RUBY_BIG_DECIMAL_H */