github.com/matrixorigin/matrixone@v0.7.0/cgo/external/decNumber/decimal32.h (about)

     1  /* ------------------------------------------------------------------ */
     2  /* Decimal 32-bit format module header                                */
     3  /* ------------------------------------------------------------------ */
     4  /* Copyright (c) IBM Corporation, 2000, 2006.  All rights reserved.   */
     5  /*                                                                    */
     6  /* This software is made available under the terms of the             */
     7  /* ICU License -- ICU 1.8.1 and later.                                */
     8  /*                                                                    */
     9  /* The description and User's Guide ("The decNumber C Library") for   */
    10  /* this software is called decNumber.pdf.  This document is           */
    11  /* available, together with arithmetic and format specifications,     */
    12  /* testcases, and Web links, on the General Decimal Arithmetic page.  */
    13  /*                                                                    */
    14  /* Please send comments, suggestions, and corrections to the author:  */
    15  /*   mfc@uk.ibm.com                                                   */
    16  /*   Mike Cowlishaw, IBM Fellow                                       */
    17  /*   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         */
    18  /* ------------------------------------------------------------------ */
    19  
    20  #if !defined(DECIMAL32)
    21    #define DECIMAL32
    22    #define DEC32NAME     "decimal32"                   /* Short name   */
    23    #define DEC32FULLNAME "Decimal 32-bit Number"       /* Verbose name */
    24    #define DEC32AUTHOR   "Mike Cowlishaw"              /* Who to blame */
    25  
    26    /* parameters for decimal32s */
    27    #define DECIMAL32_Bytes  4            /* length                     */
    28    #define DECIMAL32_Pmax   7            /* maximum precision (digits) */
    29    #define DECIMAL32_Emax   96           /* maximum adjusted exponent  */
    30    #define DECIMAL32_Emin  -95           /* minimum adjusted exponent  */
    31    #define DECIMAL32_Bias   101          /* bias for the exponent      */
    32    #define DECIMAL32_String 15           /* maximum string length, +1  */
    33    #define DECIMAL32_EconL  6            /* exp. continuation length   */
    34    /* highest biased exponent (Elimit-1)                               */
    35    #define DECIMAL32_Ehigh  (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1)
    36  
    37    /* check enough digits, if pre-defined                              */
    38    #if defined(DECNUMDIGITS)
    39      #if (DECNUMDIGITS<DECIMAL32_Pmax)
    40        #error decimal32.h needs pre-defined DECNUMDIGITS>=7 for safe use
    41      #endif
    42    #endif
    43  
    44    #ifndef DECNUMDIGITS
    45      #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined*/
    46    #endif
    47    #ifndef DECNUMBER
    48      #include "decNumber.h"              /* context and number library */
    49    #endif
    50  
    51    /* Decimal 32-bit type, accessible by bytes */
    52    typedef struct {
    53      uint8_t bytes[DECIMAL32_Bytes];     /* decimal32: 1, 5, 6, 20 bits*/
    54      } decimal32;
    55  
    56    /* special values [top byte excluding sign bit; last two bits are   */
    57    /* don't-care for Infinity on input, last bit don't-care for NaN]   */
    58    #if !defined(DECIMAL_NaN)
    59      #define DECIMAL_NaN     0x7c        /* 0 11111 00 NaN             */
    60      #define DECIMAL_sNaN    0x7e        /* 0 11111 10 sNaN            */
    61      #define DECIMAL_Inf     0x78        /* 0 11110 00 Infinity        */
    62    #endif
    63  
    64    /* ---------------------------------------------------------------- */
    65    /* Routines                                                         */
    66    /* ---------------------------------------------------------------- */
    67    /* String conversions                                               */
    68    decimal32 * decimal32FromString(decimal32 *, const char *, decContext *);
    69    char * decimal32ToString(const decimal32 *, char *);
    70    char * decimal32ToEngString(const decimal32 *, char *);
    71  
    72    /* decNumber conversions                                            */
    73    decimal32 * decimal32FromNumber(decimal32 *, const decNumber *,
    74                                    decContext *);
    75    decNumber * decimal32ToNumber(const decimal32 *, decNumber *);
    76  
    77    /* Format-dependent utilities                                       */
    78    uint32_t    decimal32IsCanonical(const decimal32 *);
    79    decimal32 * decimal32Canonical(decimal32 *, const decimal32 *);
    80  
    81  #endif