/* ------------------------------------------------------------------ */ /* Decimal Number arithmetic module header */ /* ------------------------------------------------------------------ */ /* Copyright (c) IBM Corporation, 2000-2010. All rights reserved. */ /* */ /* This software is made available under the terms of the */ /* ICU License -- ICU 1.8.1 and later. */ /* */ /* The description and User's Guide ("The decNumber C Library") for */ /* this software is called decNumber.pdf. This document is */ /* available, together with arithmetic and format specifications, */ /* testcases, and Web links, on the General Decimal Arithmetic page. */ /* */ /* Please send comments, suggestions, and corrections to the author: */ /* mfc@uk.ibm.com */ /* Mike Cowlishaw, IBM Fellow */ /* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */ /* ------------------------------------------------------------------ */ /* Modified version, for use from within ICU. * Renamed public functions, to avoid an unwanted export of the * standard names from the ICU library. * * Use ICU's uprv_malloc() and uprv_free() * * Revert comment syntax to plain C * * Remove a few compiler warnings. */ #if !defined(DECNUMBER) #define DECNUMBER #define DECNAME "decNumber" /* Short name */ #define DECFULLNAME "Decimal Number Module" /* Verbose name */ #define DECAUTHOR "Mike Cowlishaw" /* Who to blame */ #if !defined(DECCONTEXT) #include "decContext.h" #endif /* Bit settings for decNumber.bits */ #define DECNEG 0x80 /* Sign; 1=negative, 0=positive or zero */ #define DECINF 0x40 /* 1=Infinity */ #define DECNAN 0x20 /* 1=NaN */ #define DECSNAN 0x10 /* 1=sNaN */ /* The remaining bits are reserved; they must be 0 */ #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value */ /* Define the decNumber data structure. The size and shape of the */ /* units array in the structure is determined by the following */ /* constant. This must not be changed without recompiling the */ /* decNumber library modules. */ #define DECDPUN 3 /* DECimal Digits Per UNit [must be >0 */ /* and <10; 3 or powers of 2 are best]. */ /* DECNUMDIGITS is the default number of digits that can be held in */ /* the structure. If undefined, 1 is assumed and it is assumed */ /* that the structure will be immediately followed by extra space, */ /* as required. DECNUMDIGITS is always >0. */ #if !defined(DECNUMDIGITS) #define DECNUMDIGITS 1 #endif /* The size (integer data type) of each unit is determined by the */ /* number of digits it will hold. */ #if DECDPUN<=2 #define decNumberUnit uint8_t #elif DECDPUN<=4 #define decNumberUnit uint16_t #else #define decNumberUnit uint32_t #endif /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN) */ #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN) /* The data structure... */ typedef struct { int32_t digits; /* Count of digits in the coefficient; >0 */ int32_t exponent; /* Unadjusted exponent, unbiased, in */ /* range: -1999999997 through 999999999 */ uint8_t bits; /* Indicator bits (see above) */ /* Coefficient, from least significant unit */ decNumberUnit lsu[DECNUMUNITS]; } decNumber; /* Notes: */ /* 1. If digits is > DECDPUN then there will one or more */ /* decNumberUnits immediately following the first element of lsu.*/ /* These contain the remaining (more significant) digits of the */ /* number, and may be in the lsu array, or may be guaranteed by */ /* some other mechanism (such as being contained in another */ /* structure, or being overlaid on dynamically allocated */ /* storage). */ /* */ /* Each integer of the coefficient (except potentially the last) */ /* contains DECDPUN digits (e.g., a value in the range 0 through */ /* 99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3). */ /* */ /* 2. A decNumber converted to a string may need up to digits+14 */ /* characters. The worst cases (non-exponential and exponential */ /* formats) are -0.00000{9...}# and -9.{9...}E+999999999# */ /* (where # is '\0') */ /* ---------------------------------------------------------------- */ /* decNumber public functions and macros */ /* ---------------------------------------------------------------- */ /* Conversions */ decNumber * uprv_decNumberFromInt32(decNumber *, int32_t); decNumber * uprv_decNumberFromUInt32(decNumber *, uint32_t); decNumber * uprv_decNumberFromString(decNumber *, const char *, decContext *); char * uprv_decNumberToString(const decNumber *, char *); char * uprv_decNumberToEngString(const decNumber *, char *); uint32_t uprv_decNumberToUInt32(const decNumber *, decContext *); int32_t uprv_decNumberToInt32(const decNumber *, decContext *); uint8_t * uprv_decNumberGetBCD(const decNumber *, uint8_t *); decNumber * uprv_decNumberSetBCD(decNumber *, const uint8_t *, uint32_t); /* Operators and elementary functions */ decNumber * uprv_decNumberAbs(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberExp(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberInvert(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberLn(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberLogB(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberLog10(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMinus(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberNormalize(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberPlus(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberReduce(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *); decNumber * uprv_decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberSquareRoot(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberToIntegralExact(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberToIntegralValue(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *); /* Utilities */ enum decClass uprv_decNumberClass(const decNumber *, decContext *); const char * uprv_decNumberClassToString(enum decClass); decNumber * uprv_decNumberCopy(decNumber *, const decNumber *); decNumber * uprv_decNumberCopyAbs(decNumber *, const decNumber *); decNumber * uprv_decNumberCopyNegate(decNumber *, const decNumber *); decNumber * uprv_decNumberCopySign(decNumber *, const decNumber *, const decNumber *); decNumber * uprv_decNumberNextMinus(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberNextPlus(decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *); decNumber * uprv_decNumberTrim(decNumber *); const char * uprv_decNumberVersion(void); decNumber * uprv_decNumberZero(decNumber *); /* Functions for testing decNumbers (normality depends on context) */ int32_t uprv_decNumberIsNormal(const decNumber *, decContext *); int32_t uprv_decNumberIsSubnormal(const decNumber *, decContext *); /* Macros for testing decNumber *dn */ #define decNumberIsCanonical(dn) (1) /* All decNumbers are saintly */ #define decNumberIsFinite(dn) (((dn)->bits&DECSPECIAL)==0) #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0) #define decNumberIsNaN(dn) (((dn)->bits&(DECNAN|DECSNAN))!=0) #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0) #define decNumberIsQNaN(dn) (((dn)->bits&(DECNAN))!=0) #define decNumberIsSNaN(dn) (((dn)->bits&(DECSNAN))!=0) #define decNumberIsSpecial(dn) (((dn)->bits&DECSPECIAL)!=0) #define decNumberIsZero(dn) (*(dn)->lsu==0 \ && (dn)->digits==1 \ && (((dn)->bits&DECSPECIAL)==0)) #define decNumberRadix(dn) (10) #endif