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82 lines
4.2 KiB
C
82 lines
4.2 KiB
C
9 years ago
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/* ------------------------------------------------------------------ */
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/* Decimal 128-bit format module header */
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/* ------------------------------------------------------------------ */
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/* Copyright (c) IBM Corporation, 2000, 2005. All rights reserved. */
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/* */
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/* This software is made available under the terms of the */
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/* ICU License -- ICU 1.8.1 and later. */
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/* */
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/* The description and User's Guide ("The decNumber C Library") for */
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/* this software is called decNumber.pdf. This document is */
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/* available, together with arithmetic and format specifications, */
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/* testcases, and Web links, on the General Decimal Arithmetic page. */
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/* */
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/* Please send comments, suggestions, and corrections to the author: */
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/* mfc@uk.ibm.com */
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/* Mike Cowlishaw, IBM Fellow */
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/* IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK */
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/* ------------------------------------------------------------------ */
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#if !defined(DECIMAL128)
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#define DECIMAL128
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#define DEC128NAME "decimal128" /* Short name */
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#define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */
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#define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */
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/* parameters for decimal128s */
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#define DECIMAL128_Bytes 16 /* length */
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#define DECIMAL128_Pmax 34 /* maximum precision (digits) */
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#define DECIMAL128_Emax 6144 /* maximum adjusted exponent */
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#define DECIMAL128_Emin -6143 /* minimum adjusted exponent */
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#define DECIMAL128_Bias 6176 /* bias for the exponent */
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#define DECIMAL128_String 43 /* maximum string length, +1 */
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#define DECIMAL128_EconL 12 /* exp. continuation length */
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/* highest biased exponent (Elimit-1) */
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#define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1)
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/* check enough digits, if pre-defined */
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#if defined(DECNUMDIGITS)
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#if (DECNUMDIGITS<DECIMAL128_Pmax)
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#error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use
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#endif
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#endif
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#ifndef DECNUMDIGITS
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#define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/
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#endif
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#ifndef DECNUMBER
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#include "decNumber.h" /* context and number library */
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#endif
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/* Decimal 128-bit type, accessible by bytes */
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typedef struct {
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uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/
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} decimal128;
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/* special values [top byte excluding sign bit; last two bits are */
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/* don't-care for Infinity on input, last bit don't-care for NaN] */
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#if !defined(DECIMAL_NaN)
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#define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */
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#define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */
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#define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */
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#endif
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/* ---------------------------------------------------------------- */
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/* Routines */
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/* ---------------------------------------------------------------- */
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/* String conversions */
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decimal128 * decimal128FromString(decimal128 *, const char *, decContext *);
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char * decimal128ToString(const decimal128 *, char *);
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char * decimal128ToEngString(const decimal128 *, char *);
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/* decNumber conversions */
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decimal128 * decimal128FromNumber(decimal128 *, const decNumber *,
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decContext *);
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decNumber * decimal128ToNumber(const decimal128 *, decNumber *);
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/* Format-dependent utilities */
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uint32_t decimal128IsCanonical(const decimal128 *);
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decimal128 * decimal128Canonical(decimal128 *, const decimal128 *);
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#endif
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