icuSources/i18n/decNumber.h

   1 // © 2016 and later: Unicode, Inc. and others.
   2 // License & terms of use: http://www.unicode.org/copyright.html
   3 /* ------------------------------------------------------------------ */
   4 /* Decimal Number arithmetic module header                            */
   5 /* ------------------------------------------------------------------ */
   6 /* Copyright (c) IBM Corporation, 2000-2010.   All rights reserved.   */
   7 /*                                                                    */
   8 /* This software is made available under the terms of the             */
   9 /* ICU License -- ICU 1.8.1 and later.                                */
  10 /*                                                                    */
  11 /* The description and User's Guide ("The decNumber C Library") for   */
  12 /* this software is called decNumber.pdf.  This document is           */
  13 /* available, together with arithmetic and format specifications,     */
  14 /* testcases, and Web links, on the General Decimal Arithmetic page.  */
  15 /*                                                                    */
  16 /* Please send comments, suggestions, and corrections to the author:  */
  17 /*   mfc@uk.ibm.com                                                   */
  18 /*   Mike Cowlishaw, IBM Fellow                                       */
  19 /*   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         */
  20 /* ------------------------------------------------------------------ */
  21
  22 /* Modified version, for use from within ICU.
  23  *    Renamed public functions, to avoid an unwanted export of the
  24  *    standard names from the ICU library.
  25  *
  26  *    Use ICU's uprv_malloc() and uprv_free()
  27  *
  28  *    Revert comment syntax to plain C
  29  *
  30  *    Remove a few compiler warnings.
  31  */
  32
  33 #if !defined(DECNUMBER)
  34   #define DECNUMBER
  35   #define DECNAME     "decNumber"                       /* Short name */
  36   #define DECFULLNAME "Decimal Number Module"         /* Verbose name */
  37   #define DECAUTHOR   "Mike Cowlishaw"                /* Who to blame */
  38
  39   #if !defined(DECCONTEXT)
  40     #include "decContext.h"
  41   #endif
  42
  43   /* Bit settings for decNumber.bits                                  */
  44   #define DECNEG    0x80      /* Sign; 1=negative, 0=positive or zero */
  45   #define DECINF    0x40      /* 1=Infinity                           */
  46   #define DECNAN    0x20      /* 1=NaN                                */
  47   #define DECSNAN   0x10      /* 1=sNaN                               */
  48   /* The remaining bits are reserved; they must be 0                  */
  49   #define DECSPECIAL (DECINF|DECNAN|DECSNAN) /* any special value     */
  50
  51   /* Define the decNumber data structure.  The size and shape of the  */
  52   /* units array in the structure is determined by the following      */
  53   /* constant.  This must not be changed without recompiling the      */
  54   /* decNumber library modules. */
  55
  56   /* For ICU, use one digit per byte, to make it easier to emulate the
  57    * old DigitList interface on top of a decNumber
  58    */
  59   #define DECDPUN 1           /* DECimal Digits Per UNit [must be >0  */
  60                               /* and <10; 3 or powers of 2 are best]. */
  61
  62   /* DECNUMDIGITS is the default number of digits that can be held in */
  63   /* the structure.  If undefined, 1 is assumed and it is assumed     */
  64   /* that the structure will be immediately followed by extra space,  */
  65   /* as required.  DECNUMDIGITS is always >0.                         */
  66   #if !defined(DECNUMDIGITS)
  67     #define DECNUMDIGITS 1
  68   #endif
  69
  70   /* The size (integer data type) of each unit is determined by the   */
  71   /* number of digits it will hold.                                   */
  72   #if   DECDPUN<=2
  73     #define decNumberUnit uint8_t
  74   #elif DECDPUN<=4
  75     #define decNumberUnit uint16_t
  76   #else
  77     #define decNumberUnit uint32_t
  78   #endif
  79   /* The number of units needed is ceil(DECNUMDIGITS/DECDPUN)         */
  80   #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
  81
  82   /* The data structure... */
  83   typedef struct {
  84     int32_t digits;      /* Count of digits in the coefficient; >0    */
  85     int32_t exponent;    /* Unadjusted exponent, unbiased, in         */
  86                          /* range: -1999999997 through 999999999      */
  87     uint8_t bits;        /* Indicator bits (see above)                */
  88                          /* Coefficient, from least significant unit  */
  89     decNumberUnit lsu[DECNUMUNITS];
  90     } decNumber;
  91
  92   /* Notes:                                                           */
  93   /* 1. If digits is > DECDPUN then there will one or more            */
  94   /*    decNumberUnits immediately following the first element of lsu.*/
  95   /*    These contain the remaining (more significant) digits of the  */
  96   /*    number, and may be in the lsu array, or may be guaranteed by  */
  97   /*    some other mechanism (such as being contained in another      */
  98   /*    structure, or being overlaid on dynamically allocated         */
  99   /*    storage).                                                     */
 100   /*                                                                  */
 101   /*    Each integer of the coefficient (except potentially the last) */
 102   /*    contains DECDPUN digits (e.g., a value in the range 0 through */
 103   /*    99999999 if DECDPUN is 8, or 0 through 999 if DECDPUN is 3).  */
 104   /*                                                                  */
 105   /* 2. A decNumber converted to a string may need up to digits+14    */
 106   /*    characters.  The worst cases (non-exponential and exponential */
 107   /*    formats) are -0.00000{9...}# and -9.{9...}E+999999999#        */
 108   /*    (where # is '\0')                                             */
 109
 110
 111   /* ---------------------------------------------------------------- */
 112   /* decNumber public functions and macros                            */
 113   /* ---------------------------------------------------------------- */
 114   /* Conversions                                                      */
 115   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromInt32(decNumber *, int32_t);
 116   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromUInt32(decNumber *, uint32_t);
 117   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFromString(decNumber *, const char *, decContext *);
 118   U_INTERNAL char      * U_EXPORT2 uprv_decNumberToString(const decNumber *, char *);
 119   U_INTERNAL char      * U_EXPORT2 uprv_decNumberToEngString(const decNumber *, char *);
 120   U_INTERNAL uint32_t    U_EXPORT2 uprv_decNumberToUInt32(const decNumber *, decContext *);
 121   U_INTERNAL int32_t     U_EXPORT2 uprv_decNumberToInt32(const decNumber *, decContext *);
 122   U_INTERNAL uint8_t   * U_EXPORT2 uprv_decNumberGetBCD(const decNumber *, uint8_t *);
 123   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);
 124
 125   /* Operators and elementary functions                               */
 126   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAbs(decNumber *, const decNumber *, decContext *);
 127   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *);
 128   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *);
 129   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *);
 130   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *);
 131   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *);
 132   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *);
 133   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *);
 134   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *);
 135   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberExp(decNumber *, const decNumber *, decContext *);
 136   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *);
 137   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberInvert(decNumber *, const decNumber *, decContext *);
 138   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLn(decNumber *, const decNumber *, decContext *);
 139   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLogB(decNumber *, const decNumber *, decContext *);
 140   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberLog10(decNumber *, const decNumber *, decContext *);
 141   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *);
 142   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *);
 143   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *);
 144   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *);
 145   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMinus(decNumber *, const decNumber *, decContext *);
 146   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *);
 147   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberNormalize(decNumber *, const decNumber *, decContext *);
 148   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *);
 149   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberPlus(decNumber *, const decNumber *, decContext *);
 150   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *);
 151   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *);
 152   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberReduce(decNumber *, const decNumber *, decContext *);
 153   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *);
 154   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *);
 155   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *);
 156   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *);
 157   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *);
 158   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *);
 159   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *);
 160   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
 161   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *);
 162   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberToIntegralExact(decNumber *, const decNumber *, decContext *);
 163   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberToIntegralValue(decNumber *, const decNumber *, decContext *);
 164   U_INTERNAL decNumber * U_EXPORT2 uprv_decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *);
 165
 166   /* Utilities                                                        */
 167   enum decClass uprv_decNumberClass(const decNumber *, decContext *);
 168   U_INTERNAL const char * U_EXPORT2 uprv_decNumberClassToString(enum decClass);
 169   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberCopy(decNumber *, const decNumber *);
 170   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberCopyAbs(decNumber *, const decNumber *);
 171   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberCopyNegate(decNumber *, const decNumber *);
 172   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
 173   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberNextMinus(decNumber *, const decNumber *, decContext *);
 174   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberNextPlus(decNumber *, const decNumber *, decContext *);
 175   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *);
 176   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberTrim(decNumber *);
 177   U_INTERNAL const char * U_EXPORT2 uprv_decNumberVersion(void);
 178   U_INTERNAL decNumber  * U_EXPORT2 uprv_decNumberZero(decNumber *);
 179
 180   /* Functions for testing decNumbers (normality depends on context)  */
 181   U_INTERNAL int32_t U_EXPORT2 uprv_decNumberIsNormal(const decNumber *, decContext *);
 182   U_INTERNAL int32_t U_EXPORT2 uprv_decNumberIsSubnormal(const decNumber *, decContext *);
 183
 184   /* Macros for testing decNumber *dn                                 */
 185   #define decNumberIsCanonical(dn) (1)  /* All decNumbers are saintly */
 186   #define decNumberIsFinite(dn)    (((dn)->bits&DECSPECIAL)==0)
 187   #define decNumberIsInfinite(dn)  (((dn)->bits&DECINF)!=0)
 188   #define decNumberIsNaN(dn)       (((dn)->bits&(DECNAN|DECSNAN))!=0)
 189   #define decNumberIsNegative(dn)  (((dn)->bits&DECNEG)!=0)
 190   #define decNumberIsQNaN(dn)      (((dn)->bits&(DECNAN))!=0)
 191   #define decNumberIsSNaN(dn)      (((dn)->bits&(DECSNAN))!=0)
 192   #define decNumberIsSpecial(dn)   (((dn)->bits&DECSPECIAL)!=0)
 193   #define decNumberIsZero(dn)      (*(dn)->lsu==0 \
 194                                     && (dn)->digits==1 \
 195                                     && (((dn)->bits&DECSPECIAL)==0))
 196   #define decNumberRadix(dn)       (10)
 197
 198 #endif