libdecnumber/dpd/decimal64.h

   1 /* Decimal 64-bit format module header for the decNumber C Library.
   2    Copyright (C) 2005, 2007, 2009 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 3, or (at your option) any later
  10    version.
  11
  12    GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17 Under Section 7 of GPL version 3, you are granted additional
  18 permissions described in the GCC Runtime Library Exception, version
  19 3.1, as published by the Free Software Foundation.
  20
  21 You should have received a copy of the GNU General Public License and
  22 a copy of the GCC Runtime Library Exception along with this program;
  23 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  24 <http://www.gnu.org/licenses/>.  */
  25
  26 /* ------------------------------------------------------------------ */
  27 /* Decimal 64-bit format module header                                */
  28 /* ------------------------------------------------------------------ */
  29
  30 #if !defined(DECIMAL64)
  31   #define DECIMAL64
  32   #define DEC64NAME     "decimal64"                   /* Short name   */
  33   #define DEC64FULLNAME "Decimal 64-bit Number"       /* Verbose name */
  34   #define DEC64AUTHOR   "Mike Cowlishaw"              /* Who to blame */
  35
  36
  37   /* parameters for decimal64s                                        */
  38   #define DECIMAL64_Bytes  8            /* length                     */
  39   #define DECIMAL64_Pmax   16           /* maximum precision (digits) */
  40   #define DECIMAL64_Emax   384          /* maximum adjusted exponent  */
  41   #define DECIMAL64_Emin  -383          /* minimum adjusted exponent  */
  42   #define DECIMAL64_Bias   398          /* bias for the exponent      */
  43   #define DECIMAL64_String 24           /* maximum string length, +1  */
  44   #define DECIMAL64_EconL  8            /* exp. continuation length   */
  45   /* highest biased exponent (Elimit-1)                               */
  46   #define DECIMAL64_Ehigh  (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_Pmax+1)
  47
  48   /* check enough digits, if pre-defined                              */
  49   #if defined(DECNUMDIGITS)
  50     #if (DECNUMDIGITS<DECIMAL64_Pmax)
  51       #error decimal64.h needs pre-defined DECNUMDIGITS>=16 for safe use
  52     #endif
  53   #endif
  54
  55
  56   #ifndef DECNUMDIGITS
  57     #define DECNUMDIGITS DECIMAL64_Pmax /* size if not already defined*/
  58   #endif
  59   #ifndef DECNUMBER
  60     #include "decNumber.h"              /* context and number library */
  61   #endif
  62
  63   /* Decimal 64-bit type, accessible by bytes                         */
  64   typedef struct {
  65     uint8_t bytes[DECIMAL64_Bytes];     /* decimal64: 1, 5, 8, 50 bits*/
  66     } decimal64;
  67
  68   /* special values [top byte excluding sign bit; last two bits are   */
  69   /* don't-care for Infinity on input, last bit don't-care for NaN]   */
  70   #if !defined(DECIMAL_NaN)
  71     #define DECIMAL_NaN     0x7c        /* 0 11111 00 NaN             */
  72     #define DECIMAL_sNaN    0x7e        /* 0 11111 10 sNaN            */
  73     #define DECIMAL_Inf     0x78        /* 0 11110 00 Infinity        */
  74   #endif
  75
  76   /* ---------------------------------------------------------------- */
  77   /* Routines                                                         */
  78   /* ---------------------------------------------------------------- */
  79
  80 #include "decimal64Symbols.h"
  81
  82   #ifdef __cplusplus
  83   extern "C" {
  84   #endif
  85
  86   /* String conversions                                               */
  87   decimal64 * decimal64FromString(decimal64 *, const char *, decContext *);
  88   char * decimal64ToString(const decimal64 *, char *);
  89   char * decimal64ToEngString(const decimal64 *, char *);
  90
  91   /* decNumber conversions                                            */
  92   decimal64 * decimal64FromNumber(decimal64 *, const decNumber *,
  93                                   decContext *);
  94   decNumber * decimal64ToNumber(const decimal64 *, decNumber *);
  95
  96   /* Format-dependent utilities                                       */
  97   uint32_t    decimal64IsCanonical(const decimal64 *);
  98   decimal64 * decimal64Canonical(decimal64 *, const decimal64 *);
  99
 100   #ifdef __cplusplus
 101   }
 102   #endif
 103
 104 #endif