1 /* ------------------------------------------------------------------ */
2 /* Decimal Number arithmetic module header */
3 /* ------------------------------------------------------------------ */
4 /* Copyright (c) IBM Corporation, 2000, 2010. All rights reserved. */
6 /* This software is made available under the terms of the */
7 /* ICU License -- ICU 1.8.1 and later. */
9 /* The description and User's Guide ("The decNumber C Library") for */
10 /* this software is called decNumber.pdf. This document is */
11 /* available, together with arithmetic and format specifications, */
12 /* testcases, and Web links, on the General Decimal Arithmetic page. */
14 /* Please send comments, suggestions, and corrections to the author: */
16 /* Mike Cowlishaw, IBM Fellow */
17 /* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */
18 /* ------------------------------------------------------------------ */
20 #if !defined(DECNUMBER)
22 #define DECNAME "decNumber" /* Short name */
23 #define DECFULLNAME "Decimal Number Module" /* Verbose name */
24 #define DECAUTHOR "Mike Cowlishaw" /* Who to blame */
26 #if !defined(DECCONTEXT)
27 #include "decContext.h"
30 /* Bit settings for decNumber.bits */
31 #define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */
32 #define DECINF 0x40 /* 1=Infinity */
33 #define DECNAN 0x20 /* 1=NaN */
34 #define DECSNAN 0x10 /* 1=sNaN */
35 /* The remaining bits are reserved; they must be 0 */
36 #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */
38 /* Define the decNumber data structure. The size and shape of the */
39 /* units array in the structure is determined by the following */
40 /* constant. This must not be changed without recompiling the */
41 /* decNumber library modules. */
43 #define DECDPUN 3 /* DECimal Digits Per UNit [must be >0 */
44 /* and <10; 3 or powers of 2 are best]. */
46 /* DECNUMDIGITS is the default number of digits that can be held in */
47 /* the structure. If undefined, 1 is assumed and it is assumed */
48 /* that the structure will be immediately followed by extra space, */
49 /* as required. DECNUMDIGITS is always >0. */
50 #if !defined(DECNUMDIGITS)
51 #define DECNUMDIGITS 1
54 /* The size (integer data type) of each unit is determined by the */
55 /* number of digits it will hold. */
57 #define decNumberUnit uint8_t
59 #define decNumberUnit uint16_t
61 #define decNumberUnit uint32_t
63 /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */
64 #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
66 /* The data structure... */
68 int32_t digits; /* Count of digits in the coefficient; >0 */
69 int32_t exponent; /* Unadjusted exponent, unbiased, in */
70 /* range: -1999999997 through 999999999 */
71 uint8_t bits; /* Indicator bits (see above) */
72 /* Coefficient, from least significant unit */
73 decNumberUnit lsu[DECNUMUNITS];
77 /* 1. If digits is > DECDPUN then there will one or more */
78 /* decNumberUnits immediately following the first element of lsu. */
79 /* These contain the remaining (more significant) digits of the */
80 /* number, and may be in the lsu array, or may be guaranteed by */
81 /* some other mechanism (such as being contained in another */
82 /* structure, or being overlaid on dynamically allocated */
85 /* Each integer of the coefficient (except potentially the last) */
86 /* contains DECDPUN digits (e.g., a value in the range 0 through */
87 /* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */
89 /* 2. A decNumber converted to a string may need up to digits+14 */
90 /* characters. The worst cases (non-exponential and exponential */
91 /* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */
92 /* (where # is '\0') */
94 /* ---------------------------------------------------------------- */
95 /* decNumber public functions and macros */
96 /* ---------------------------------------------------------------- */
98 decNumber *decNumberFromInt32(decNumber *, int32_t);
99 decNumber *decNumberFromUInt32(decNumber *, uint32_t);
100 decNumber *decNumberFromString(decNumber *, const char *, decContext *);
101 char *decNumberToString(const decNumber *, char *);
102 char *decNumberToEngString(const decNumber *, char *);
103 uint32_t decNumberToUInt32(const decNumber *, decContext *);
104 int32_t decNumberToInt32(const decNumber *, decContext *);
105 uint8_t *decNumberGetBCD(const decNumber *, uint8_t *);
106 decNumber *decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);
108 /* Operators and elementary functions */
109 decNumber *decNumberAbs(decNumber *, const decNumber *, decContext *);
110 decNumber *decNumberAdd(decNumber *, const decNumber *, const decNumber *,
112 decNumber *decNumberAnd(decNumber *, const decNumber *, const decNumber *,
114 decNumber *decNumberCompare(decNumber *, const decNumber *, const decNumber *,
116 decNumber *decNumberCompareSignal(decNumber *, const decNumber *,
117 const decNumber *, decContext *);
118 decNumber *decNumberCompareTotal(decNumber *, const decNumber *,
119 const decNumber *, decContext *);
120 decNumber *decNumberCompareTotalMag(decNumber *, const decNumber *,
121 const decNumber *, decContext *);
122 decNumber *decNumberDivide(decNumber *, const decNumber *, const decNumber *,
124 decNumber *decNumberDivideInteger(decNumber *, const decNumber *,
125 const decNumber *, decContext *);
126 decNumber *decNumberExp(decNumber *, const decNumber *, decContext *);
127 decNumber *decNumberFMA(decNumber *, const decNumber *, const decNumber *,
128 const decNumber *, decContext *);
129 decNumber *decNumberInvert(decNumber *, const decNumber *, decContext *);
130 decNumber *decNumberLn(decNumber *, const decNumber *, decContext *);
131 decNumber *decNumberLogB(decNumber *, const decNumber *, decContext *);
132 decNumber *decNumberLog10(decNumber *, const decNumber *, decContext *);
133 decNumber *decNumberMax(decNumber *, const decNumber *, const decNumber *,
135 decNumber *decNumberMaxMag(decNumber *, const decNumber *, const decNumber *,
137 decNumber *decNumberMin(decNumber *, const decNumber *, const decNumber *,
139 decNumber *decNumberMinMag(decNumber *, const decNumber *, const decNumber *,
141 decNumber *decNumberMinus(decNumber *, const decNumber *, decContext *);
142 decNumber *decNumberMultiply(decNumber *, const decNumber *, const decNumber *,
144 decNumber *decNumberNormalize(decNumber *, const decNumber *, decContext *);
145 decNumber *decNumberOr(decNumber *, const decNumber *, const decNumber *,
147 decNumber *decNumberPlus(decNumber *, const decNumber *, decContext *);
148 decNumber *decNumberPower(decNumber *, const decNumber *, const decNumber *,
150 decNumber *decNumberQuantize(decNumber *, const decNumber *, const decNumber *,
152 decNumber *decNumberReduce(decNumber *, const decNumber *, decContext *);
153 decNumber *decNumberRemainder(decNumber *, const decNumber *, const decNumber *,
155 decNumber *decNumberRemainderNear(decNumber *, const decNumber *,
156 const decNumber *, decContext *);
157 decNumber *decNumberRescale(decNumber *, const decNumber *, const decNumber *,
159 decNumber *decNumberRotate(decNumber *, const decNumber *, const decNumber *,
161 decNumber *decNumberSameQuantum(decNumber *, const decNumber *,
163 decNumber *decNumberScaleB(decNumber *, const decNumber *, const decNumber *,
165 decNumber *decNumberShift(decNumber *, const decNumber *, const decNumber *,
167 decNumber *decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
168 decNumber *decNumberSubtract(decNumber *, const decNumber *, const decNumber *,
170 decNumber *decNumberToIntegralExact(decNumber *, const decNumber *,
172 decNumber *decNumberToIntegralValue(decNumber *, const decNumber *,
174 decNumber *decNumberXor(decNumber *, const decNumber *, const decNumber *,
178 enum decClass decNumberClass(const decNumber *, decContext *);
179 const char *decNumberClassToString(enum decClass);
180 decNumber *decNumberCopy(decNumber *, const decNumber *);
181 decNumber *decNumberCopyAbs(decNumber *, const decNumber *);
182 decNumber *decNumberCopyNegate(decNumber *, const decNumber *);
183 decNumber *decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
184 decNumber *decNumberNextMinus(decNumber *, const decNumber *, decContext *);
185 decNumber *decNumberNextPlus(decNumber *, const decNumber *, decContext *);
186 decNumber *decNumberNextToward(decNumber *, const decNumber *,
187 const decNumber *, decContext *);
188 decNumber *decNumberTrim(decNumber *);
189 const char *decNumberVersion(void);
190 decNumber *decNumberZero(decNumber *);
192 /* Functions for testing decNumbers (normality depends on context) */
193 int32_t decNumberIsNormal(const decNumber *, decContext *);
194 int32_t decNumberIsSubnormal(const decNumber *, decContext *);
196 /* Macros for testing decNumber *dn */
197 #define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */
198 #define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0)
199 #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0)
200 #define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0)
201 #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0)
202 #define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0)
203 #define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0)
204 #define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0)
205 #define decNumberIsZero(dn) (*(dn)->lsu==0 \
207 && (((dn)->bits&DECSPECIAL)==0))
208 #define decNumberRadix(dn) (10)