decNumber.h

/* Decimal number arithmetic module header for the decNumber C Library.
   Copyright (C) 2005-2021 Free Software Foundation, Inc.
   Contributed by IBM Corporation.  Author Mike Cowlishaw.

   This file is part of GCC.

   GCC is free software; you can redistribute it and/or modify it under
   the terms of the GNU General Public License as published by the Free
   Software Foundation; either version 3, or (at your option) any later
   version.

   GCC is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
   for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

/* ------------------------------------------------------------------ */
/* Decimal Number arithmetic module header			      */
/* ------------------------------------------------------------------ */

#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			      */
  /* ---------------------------------------------------------------- */

  #include "decNumberSymbols.h"

  #ifdef __cplusplus
  extern "C" {
  #endif

  /* Conversions						      */
  decNumber * decNumberFromInt32(decNumber *, int32_t);
  decNumber * decNumberFromUInt32(decNumber *, uint32_t);
  decNumber * decNumberFromString(decNumber *, const char *, decContext *);
  char	    * decNumberToString(const decNumber *, char *);
  char	    * decNumberToEngString(const decNumber *, char *);
  uint32_t    decNumberToUInt32(const decNumber *, decContext *);
  int32_t     decNumberToInt32(const decNumber *, decContext *);
  uint8_t   * decNumberGetBCD(const decNumber *, uint8_t *);
  decNumber * decNumberSetBCD(decNumber *, const uint8_t *, uint32_t);

  /* Operators and elementary functions 			      */
  decNumber * decNumberAbs(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberAdd(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberAnd(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberCompare(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberCompareSignal(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberCompareTotal(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberCompareTotalMag(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberDivide(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberDivideInteger(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberExp(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberFMA(decNumber *, const decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberInvert(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberLn(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberLogB(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberLog10(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMax(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMaxMag(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMin(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMinMag(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMinus(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberMultiply(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberNormalize(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberOr(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberPlus(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberPower(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberQuantize(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberReduce(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberRemainder(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberRemainderNear(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberRescale(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberRotate(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberSameQuantum(decNumber *, const decNumber *, const decNumber *);
  decNumber * decNumberScaleB(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberShift(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberSquareRoot(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberSubtract(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber * decNumberToIntegralExact(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberToIntegralValue(decNumber *, const decNumber *, decContext *);
  decNumber * decNumberXor(decNumber *, const decNumber *, const decNumber *, decContext *);

  /* Utilities							      */
  enum decClass decNumberClass(const decNumber *, decContext *);
  const char * decNumberClassToString(enum decClass);
  decNumber  * decNumberCopy(decNumber *, const decNumber *);
  decNumber  * decNumberCopyAbs(decNumber *, const decNumber *);
  decNumber  * decNumberCopyNegate(decNumber *, const decNumber *);
  decNumber  * decNumberCopySign(decNumber *, const decNumber *, const decNumber *);
  decNumber  * decNumberNextMinus(decNumber *, const decNumber *, decContext *);
  decNumber  * decNumberNextPlus(decNumber *, const decNumber *, decContext *);
  decNumber  * decNumberNextToward(decNumber *, const decNumber *, const decNumber *, decContext *);
  decNumber  * decNumberTrim(decNumber *);
  const char * decNumberVersion(void);
  decNumber  * decNumberZero(decNumber *);

  /* Functions for testing decNumbers (normality depends on context)  */
  int32_t decNumberIsNormal(const decNumber *, decContext *);
  int32_t 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)

  #ifdef __cplusplus
  }
  #endif

#endif