libdecnumber/decNumber.h

   1 /* Decimal Number module header for the decNumber C Library
   2    Copyright (C) 2005 Free Software Foundation, Inc.
   3    Contributed by IBM Corporation.  Author Mike Cowlishaw.
   4
   5    This file is part of GCC.
   6
   7    GCC is free software; you can redistribute it and/or modify it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    In addition to the permissions in the GNU General Public License,
  13    the Free Software Foundation gives you unlimited permission to link
  14    the compiled version of this file into combinations with other
  15    programs, and to distribute those combinations without any
  16    restriction coming from the use of this file.  (The General Public
  17    License restrictions do apply in other respects; for example, they
  18    cover modification of the file, and distribution when not linked
  19    into a combine executable.)
  20
  21    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  22    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  23    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  24    for more details.
  25
  26    You should have received a copy of the GNU General Public License
  27    along with GCC; see the file COPYING.  If not, write to the Free
  28    Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
  29    02110-1301, USA.  */
  30
  31 #if !defined(DECNUMBER)
  32 #define DECNUMBER
  33 #define DECNAME     "decNumber" /* Short name */
  34 #define DECVERSION  "decNumber 3.24"    /* Version [16 max.] */
  35 #define DECFULLNAME "Decimal Number Module"     /* Verbose name */
  36 #define DECAUTHOR   "Mike Cowlishaw"    /* Who to blame */
  37
  38 #if !defined(DECCONTEXT)
  39 #include "decContext.h"
  40 #endif
  41
  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   /* DECNUMDIGITS is the default number of digits we can hold in the */
  52   /* structure.  If undefined, 1 is assumed and it is assumed that the */
  53   /* structure will be immediately followed by extra space (if */
  54   /* required).  DECNUMDIGITS is always >0. */
  55 #if !defined(DECNUMDIGITS)
  56 #define DECNUMDIGITS 1
  57 #endif
  58
  59
  60   /* Define the decNumber data structure.  The size and shape of the */
  61   /* units array in the structure is determined by the following */
  62   /* constant.  This must not be changed without recompiling the */
  63   /* decNumber library modules. */
  64 #define DECDPUN 4               /* Decimal Digits Per UNit [must be in */
  65                                    /* range 1-9; power of 2 recommended]. */
  66   /* The size (integer data type) of each unit is determined by the */
  67   /* number of digits it will hold. */
  68 #if   DECDPUN<=2
  69 #define decNumberUnit uint8_t
  70 #elif DECDPUN<=4
  71 #define decNumberUnit uint16_t
  72 #else
  73 #define decNumberUnit uint32_t
  74 #endif
  75   /* The number of decNumberUnits we need is ceiling of DECNUMDIGITS/DECDPUN */
  76 #define DECNUMUNITS ((DECNUMDIGITS+DECDPUN-1)/DECDPUN)
  77
  78   /* The data structure... */
  79 typedef struct
  80 {
  81   int32_t digits;               /* Count of digits in the coefficient; >0 */
  82   int32_t exponent;             /* Unadjusted exponent, unbiased, in */
  83   /* range: -1999999997 through 999999999 */
  84   uint8_t bits;                 /* Indicator bits (see above) */
  85   decNumberUnit lsu[DECNUMUNITS];       /* Coefficient, from least significant unit */
  86 } decNumber;
  87
  88   /* Notes: */
  89   /* 1. If digits is > DECDPUN then there will be more than one */
  90   /*    decNumberUnits immediately following the first element of lsu. */
  91   /*    These contain the remaining (more significant) digits of the */
  92   /*    number, and may be in the lsu array, or may be guaranteed by */
  93   /*    some other mechanism (such as being contained in another */
  94   /*    structure, or being overlaid on dynamically allocated storage). */
  95   /* */
  96   /*    Each integer of the coefficient (except the possibly the last) */
  97   /*    contains DECDPUN digits (e.g., a value in the range 0 through */
  98   /*    99999999 if DECDPUN is 8, or 0 through 9999 if DECDPUN is 4). */
  99   /* */
 100   /* 2. A decNumber converted to a string may need up to digits+14 */
 101   /*    characters.  The worst cases (non-exponential and exponential */
 102   /*    formats) are: -0.00000{9...}# */
 103   /*             and: -9.{9...}E+999999999#   (where # is '\0') */
 104
 105
 106   /* ------------------------------------------------------------------ */
 107   /* decNumber public functions and macros                              */
 108   /* ------------------------------------------------------------------ */
 109
 110 #ifdef IN_LIBGCC2
 111 #define decNumberFromString __decNumberFromString
 112 #define decNumberToString __decNumberToString
 113 #define decNumberToEngString __decNumberToEngString
 114 #define decNumberAbs __decNumberAbs
 115 #define decNumberAdd __decNumberAdd
 116 #define decNumberCompare __decNumberCompare
 117 #define decNumberDivide __decNumberDivide
 118 #define decNumberDivideInteger __decNumberDivideInteger
 119 #define decNumberMax __decNumberMax
 120 #define decNumberMin __decNumberMin
 121 #define decNumberMinus __decNumberMinus
 122 #define decNumberMultiply __decNumberMultiply
 123 #define decNumberNormalize __decNumberNormalize
 124 #define decNumberPlus __decNumberPlus
 125 #define decNumberPower __decNumberPower
 126 #define decNumberQuantize __decNumberQuantize
 127 #define decNumberRemainder __decNumberRemainder
 128 #define decNumberRemainderNear __decNumberRemainderNear
 129 #define decNumberRescale __decNumberRescale
 130 #define decNumberSameQuantum __decNumberSameQuantum
 131 #define decNumberSquareRoot __decNumberSquareRoot
 132 #define decNumberSubtract __decNumberSubtract
 133 #define decNumberToIntegralValue __decNumberToIntegralValue
 134 #define decNumberCopy __decNumberCopy
 135 #define decNumberTrim __decNumberTrim
 136 #define decNumberVersion __decNumberVersion
 137 #define decNumberZero __decNumberZero
 138 #endif
 139
 140   /* Conversions */
 141 decNumber *decNumberFromString (decNumber *, const char *, decContext *);
 142 char *decNumberToString (const decNumber *, char *);
 143 char *decNumberToEngString (const decNumber *, char *);
 144
 145   /* Operators */
 146 decNumber *decNumberAbs (decNumber *, const decNumber *, decContext *);
 147 decNumber *decNumberAdd (decNumber *, const decNumber *,
 148                          const decNumber *, decContext *);
 149 decNumber *decNumberCompare (decNumber *, const decNumber *,
 150                              const decNumber *, decContext *);
 151 decNumber *decNumberDivide (decNumber *, const decNumber *,
 152                             const decNumber *, decContext *);
 153 decNumber *decNumberDivideInteger (decNumber *, const decNumber *,
 154                                    const decNumber *, decContext *);
 155 decNumber *decNumberMax (decNumber *, const decNumber *,
 156                          const decNumber *, decContext *);
 157 decNumber *decNumberMin (decNumber *, const decNumber *,
 158                          const decNumber *, decContext *);
 159 decNumber *decNumberMinus (decNumber *, const decNumber *, decContext *);
 160 decNumber *decNumberMultiply (decNumber *, const decNumber *,
 161                               const decNumber *, decContext *);
 162 decNumber *decNumberNormalize (decNumber *, const decNumber *, decContext *);
 163 decNumber *decNumberPlus (decNumber *, const decNumber *, decContext *);
 164 decNumber *decNumberPower (decNumber *, const decNumber *,
 165                            const decNumber *, decContext *);
 166 decNumber *decNumberQuantize (decNumber *, const decNumber *,
 167                               const decNumber *, decContext *);
 168 decNumber *decNumberRemainder (decNumber *, const decNumber *,
 169                                const decNumber *, decContext *);
 170 decNumber *decNumberRemainderNear (decNumber *, const decNumber *,
 171                                    const decNumber *, decContext *);
 172 decNumber *decNumberRescale (decNumber *, const decNumber *,
 173                              const decNumber *, decContext *);
 174 decNumber *decNumberSameQuantum (decNumber *, const decNumber *, const decNumber *);
 175 decNumber *decNumberSquareRoot (decNumber *, const decNumber *, decContext *);
 176 decNumber *decNumberSubtract (decNumber *, const decNumber *,
 177                               const decNumber *, decContext *);
 178 decNumber *decNumberToIntegralValue (decNumber *, const decNumber *, decContext *);
 179
 180   /* Utilities */
 181 decNumber *decNumberCopy (decNumber *, const decNumber *);
 182 decNumber *decNumberTrim (decNumber *);
 183 const char *decNumberVersion (void);
 184 decNumber *decNumberZero (decNumber *);
 185
 186   /* Macros */
 187 #define decNumberIsZero(dn)     (*(dn)->lsu==0 \
 188                                    && (dn)->digits==1 \
 189                                    && (((dn)->bits&DECSPECIAL)==0))
 190 #define decNumberIsNegative(dn) (((dn)->bits&DECNEG)!=0)
 191 #define decNumberIsNaN(dn)      (((dn)->bits&(DECNAN|DECSNAN))!=0)
 192 #define decNumberIsInfinite(dn) (((dn)->bits&DECINF)!=0)
 193
 194 #endif