/* 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 */
/* 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. */
/* For ICU, use one digit per byte, to make it easier to emulate the * old DigitList interface on top of a decNumber
*/ #define DECDPUN 1 /* 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... */ typedefstruct {
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') */
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