// vim: filetype=c:tabstop=4:ai:expandtab
// SPDX-License-Identifier: ICU
// scspell-id: ba161c23-f62c-11ec-b4ce-80ee73e9b8e7
/* ------------------------------------------------------------------ */
/* Decimal 32-bit format module header                                */
/* ------------------------------------------------------------------ */
/* Copyright (c) IBM Corporation, 2000, 2006.  All rights reserved.   */
/*                                                                    */
/* This software is made available under the terms of the             */
/* ICU License -- ICU 1.8.1 and later.                                */
/*                                                                    */
/* The description and User's Guide ("The decNumber C Library") for   */
/* this software is called decNumber.pdf.  This document is           */
/* available, together with arithmetic and format specifications,     */
/* testcases, and Web links, on the General Decimal Arithmetic page.  */
/*                                                                    */
/* Please send comments, suggestions, and corrections to the author:  */
/*   mfc@uk.ibm.com                                                   */
/*   Mike Cowlishaw, IBM Fellow                                       */
/*   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         */
/* ------------------------------------------------------------------ */

#if !defined(DECIMAL32)
# define DECIMAL32
# define DEC32NAME     "decimal32"                    /* Short name   */
# define DEC32FULLNAME "Decimal 32-bit Number"        /* Verbose name */
# define DEC32AUTHOR   "Mike Cowlishaw"               /* Who to blame */

  /* parameters for decimal32s */
# define DECIMAL32_Bytes  4             /* length                     */
# define DECIMAL32_Pmax   7             /* maximum precision (digits) */
# define DECIMAL32_Emax   96            /* maximum adjusted exponent  */
# define DECIMAL32_Emin  -95            /* minimum adjusted exponent  */
# define DECIMAL32_Bias   101           /* bias for the exponent      */
# define DECIMAL32_String 15            /* maximum string length, +1  */
# define DECIMAL32_EconL  6             /* exp. continuation length   */
  /* highest biased exponent (Elimit-1)                               */
# define DECIMAL32_Ehigh                                               \
    (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1)

  /* check enough digits, if pre-defined                              */
# if defined(DECNUMDIGITS)
#  if (DECNUMDIGITS<DECIMAL32_Pmax)
#   error decimal32.h needs pre-defined DECNUMDIGITS>=7 for safe use
#  endif
# endif

# ifndef DECNUMDIGITS
#  define DECNUMDIGITS DECIMAL32_Pmax  /* size if not already defined */
# endif
# ifndef DECNUMBER
#  include "decNumber.h"               /* context and number library  */
# endif

  /* Decimal 32-bit type, accessible by bytes */
  typedef struct {
    uint8_t bytes[DECIMAL32_Bytes];    /* decimal32: 1, 5, 6, 20 bits */
    } decimal32;

  /* special values [top byte excluding sign bit; last two bits are   */
  /* don't-care for Infinity on input, last bit don't-care for NaN]   */
# if !defined(DECIMAL_NaN)
#  define DECIMAL_NaN     0x7c          /* 0 11111 00 NaN             */
#  define DECIMAL_sNaN    0x7e          /* 0 11111 10 sNaN            */
#  define DECIMAL_Inf     0x78          /* 0 11110 00 Infinity        */
# endif

  /* ---------------------------------------------------------------- */
  /* Routines                                                         */
  /* ---------------------------------------------------------------- */
  /* String conversions                                               */
  decimal32 * decimal32FromString(decimal32 *, const char *,
    decContext *);
  char * decimal32ToString(const decimal32 *, char *);
  char * decimal32ToEngString(const decimal32 *, char *);

  /* decNumber conversions                                            */
  decimal32 * decimal32FromNumber(decimal32 *, const decNumber *,
                                  decContext *);
  decNumber * decimal32ToNumber(const decimal32 *, decNumber *);

  /* Format-dependent utilities                                       */
  uint32_t    decimal32IsCanonical(const decimal32 *);
  decimal32 * decimal32Canonical(decimal32 *, const decimal32 *);

#endif
