1 /* ------------------------------------------------------------------ */ 2 /* Decimal Number arithmetic module header */ 3 /* ------------------------------------------------------------------ */ 4 /* Copyright (c) IBM Corporation, 2000-2010. All rights reserved. */ 5 /* */ 6 /* This software is made available under the terms of the */ 7 /* ICU License -- ICU 1.8.1 and later. */ 8 /* */ 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. */ 13 /* */ 14 /* Please send comments, suggestions, and corrections to the author: */ 15 /* mfc (at) uk.ibm.com */ 16 /* Mike Cowlishaw, IBM Fellow */ 17 /* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */ 18 /* ------------------------------------------------------------------ */ 19 20 /* Modified version, for use from within ICU. 21 * Renamed public functions, to avoid an unwanted export of the 22 * standard names from the ICU library. 23 * 24 * Use ICU's uprv_malloc() and uprv_free() 25 * 26 * Revert comment syntax to plain C 27 * 28 * Remove a few compiler warnings. 29 */ 30 31 #if !defined(DECNUMBER) 32 #define DECNUMBER 33 #define DECNAME "decNumber" /* Short name */ 34 #define DECFULLNAME "Decimal Number Module" /* Verbose name */ 35 #define DECAUTHOR "Mike Cowlishaw" /* Who to blame */ 36 37 #if !defined(DECCONTEXT) 38 #include "decContext.h" 39 #endif 40 41 /* Bit settings for decNumber.bits */ 42 #define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */ 43 #define DECINF 0x40 /* 1=Infinity */ 44 #define DECNAN 0x20 /* 1=NaN */ 45 #define DECSNAN 0x10 /* 1=sNaN */ 46 /* The remaining bits are reserved; they must be 0 */ 47 #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */ 48 49 /* Define the decNumber data structure. The size and shape of the */ 50 /* units array in the structure is determined by the following */ 51 /* constant. This must not be changed without recompiling the */ 52 /* decNumber library modules. */ 53 54 /* For ICU, use one digit per byte, to make it easier to emulate the 55 * old DigitList interface on top of a decNumber 56 */ 57 #define DECDPUN 1 /* DECimal Digits Per UNit [must be >0 */ 58 /* and <10; 3 or powers of 2 are best]. */ 59 60 /* DECNUMDIGITS is the default number of digits that can be held in */ 61 /* the structure. If undefined, 1 is assumed and it is assumed */ 62 /* that the structure will be immediately followed by extra space, */ 63 /* as required. DECNUMDIGITS is always >0. */ 64 #if !defined(DECNUMDIGITS) 65 #define DECNUMDIGITS 1 66 #endif 67 68 /* The size (integer data type) of each unit is determined by the */ 69 /* number of digits it will hold. */ 70 #if DECDPUN<=2 71 #define decNumberUnit uint8_t 72 #elif DECDPUN<=4 73 #define decNumberUnit uint16_t 74 #else 75 #define decNumberUnit uint32_t 76 #endif 77 /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */ 78 #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN) 79 80 /* The data structure... */ 81 typedef struct { 82 int32_t digits; /* Count of digits in the coefficient; >0 */ 83 int32_t exponent; /* Unadjusted exponent, unbiased, in */ 84 /* range: -1999999997 through 999999999 */ 85 uint8_t bits; /* Indicator bits (see above) */ 86 /* Coefficient, from least significant unit */ 87 decNumberUnit lsu[DECNUMUNITS]; 88 } decNumber; 89 90 /* Notes: */ 91 /* 1. If digits is > DECDPUN then there will one or more */ 92 /* decNumberUnits immediately following the first element of lsu.*/ 93 /* These contain the remaining (more significant) digits of the */ 94 /* number, and may be in the lsu array, or may be guaranteed by */ 95 /* some other mechanism (such as being contained in another */ 96 /* structure, or being overlaid on dynamically allocated */ 97 /* storage). */ 98 /* */ 99 /* Each integer of the coefficient (except potentially the last) */ 100 /* contains DECDPUN digits (e.g., a value in the range 0 through */ 101 /* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */ 102 /* */ 103 /* 2. A decNumber converted to a string may need up to digits+14 */ 104 /* characters. The worst cases (non-exponential and exponential */ 105 /* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */ 106 /* (where # is '\0') */ 107 108 109 /* ---------------------------------------------------------------- */ 110 /* decNumber public functions and macros */ 111 /* ---------------------------------------------------------------- */ 112 /* Conversions */ 113 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromInt32(decNumber *, int32_t); 114 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromUInt32(decNumber *, uint32_t); 115 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromString(decNumber *, const char *, decContext *); 116 U_INTERNAL char * U_EXPORT2 uprv_decNumberToString(const decNumber *, char *); 117 U_INTERNAL char * U_EXPORT2 uprv_decNumberToEngString(const decNumber *, char *); 118 U_INTERNAL uint32_t U_EXPORT2 uprv_decNumberToUInt32(const decNumber *, decContext *); 119 U_INTERNAL int32_t U_EXPORT2 uprv_decNumberToInt32(const decNumber *, decContext *); 120 U_INTERNAL uint8_t * U_EXPORT2 uprv_decNumberGetBCD(const decNumber *, uint8_t *); 121 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSetBCD(decNumber *, const uint8_t *, uint32_t); 122 123 /* Operators and elementary functions */ 124 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAbs(decNumber *, const decNumber *, decContext *); 125 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *); 126 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *); 127 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *); 128 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *); 129 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *); 130 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *); 131 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *); 132 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *); 133 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberExp(decNumber *, const decNumber *, decContext *); 134 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *); 135 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberInvert(decNumber *, const decNumber *, decContext *); 136 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLn(decNumber *, const decNumber *, decContext *); 137 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLogB(decNumber *, const decNumber *, decContext *); 138 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLog10(decNumber *, const decNumber *, decContext *); 139 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *); 140 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *); 141 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *); 142 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *); 143 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMinus(decNumber *, const decNumber *, decContext *); 144 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *); 145 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberNormalize(decNumber *, const decNumber *, decContext *); 146 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *); 147 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberPlus(decNumber *, const decNumber *, decContext *); 148 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *); 149 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *); 150 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberReduce(decNumber *, const decNumber *, decContext *); 151 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *); 152 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *); 153 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *); 154 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *); 155 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *); 156 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *); 157 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *); 158 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSquareRoot(decNumber *, const decNumber *, decContext *); 159 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *); 160 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberToIntegralExact(decNumber *, const decNumber *, decContext *); 161 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberToIntegralValue(decNumber *, const decNumber *, decContext *); 162 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *); 163 164 /* Utilities */ 165 enum decClass uprv_decNumberClass(const decNumber *, decContext *); 166 U_INTERNAL const char * U_EXPORT2 uprv_decNumberClassToString(enum decClass); 167 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCopy(decNumber *, const decNumber *); 168 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCopyAbs(decNumber *, const decNumber *); 169 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCopyNegate(decNumber *, const decNumber *); 170 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCopySign(decNumber *, const decNumber *, const decNumber *); 171 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberNextMinus(decNumber *, const decNumber *, decContext *); 172 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberNextPlus(decNumber *, const decNumber *, decContext *); 173 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *); 174 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberTrim(decNumber *); 175 U_INTERNAL const char * U_EXPORT2 uprv_decNumberVersion(void); 176 U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberZero(decNumber *); 177 178 /* Functions for testing decNumbers (normality depends on context) */ 179 U_INTERNAL int32_t U_EXPORT2 uprv_decNumberIsNormal(const decNumber *, decContext *); 180 U_INTERNAL int32_t U_EXPORT2 uprv_decNumberIsSubnormal(const decNumber *, decContext *); 181 182 /* Macros for testing decNumber *dn */ 183 #define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */ 184 #define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0) 185 #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0) 186 #define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0) 187 #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0) 188 #define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0) 189 #define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0) 190 #define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0) 191 #define decNumberIsZero(dn) (*(dn)->lsu==0 \ 192 && (dn)->digits==1 \ 193 && (((dn)->bits&DECSPECIAL)==0)) 194 #define decNumberRadix(dn) (10) 195 196 #endif 197
