| /* ------------------------------------------------------------------ */ | |
| /* Decimal 128-bit format module header */ | |
| /* ------------------------------------------------------------------ */ | |
| /* Copyright (c) IBM Corporation, 2000, 2005. 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(DECIMAL128) | |
| #define DECIMAL128 | |
| #define DEC128NAME "decimal128" /* Short name */ | |
| #define DEC128FULLNAME "Decimal 128-bit Number" /* Verbose name */ | |
| #define DEC128AUTHOR "Mike Cowlishaw" /* Who to blame */ | |
| /* parameters for decimal128s */ | |
| #define DECIMAL128_Bytes 16 /* length */ | |
| #define DECIMAL128_Pmax 34 /* maximum precision (digits) */ | |
| #define DECIMAL128_Emax 6144 /* maximum adjusted exponent */ | |
| #define DECIMAL128_Emin -6143 /* minimum adjusted exponent */ | |
| #define DECIMAL128_Bias 6176 /* bias for the exponent */ | |
| #define DECIMAL128_String 43 /* maximum string length, +1 */ | |
| #define DECIMAL128_EconL 12 /* exp. continuation length */ | |
| /* highest biased exponent (Elimit-1) */ | |
| #define DECIMAL128_Ehigh (DECIMAL128_Emax+DECIMAL128_Bias-DECIMAL128_Pmax+1) | |
| /* check enough digits, if pre-defined */ | |
| #if defined(DECNUMDIGITS) | |
| #if (DECNUMDIGITS<DECIMAL128_Pmax) | |
| #error decimal128.h needs pre-defined DECNUMDIGITS>=34 for safe use | |
| #endif | |
| #endif | |
| #ifndef DECNUMDIGITS | |
| #define DECNUMDIGITS DECIMAL128_Pmax /* size if not already defined*/ | |
| #endif | |
| #ifndef DECNUMBER | |
| #include "decNumber.h" /* context and number library */ | |
| #endif | |
| /* Decimal 128-bit type, accessible by bytes */ | |
| typedef struct { | |
| uint8_t bytes[DECIMAL128_Bytes]; /* decimal128: 1, 5, 12, 110 bits*/ | |
| } decimal128; | |
| /* 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 */ | |
| decimal128 * decimal128FromString(decimal128 *, const char *, decContext *); | |
| char * decimal128ToString(const decimal128 *, char *); | |
| char * decimal128ToEngString(const decimal128 *, char *); | |
| /* decNumber conversions */ | |
| decimal128 * decimal128FromNumber(decimal128 *, const decNumber *, | |
| decContext *); | |
| decNumber * decimal128ToNumber(const decimal128 *, decNumber *); | |
| /* Format-dependent utilities */ | |
| uint32_t decimal128IsCanonical(const decimal128 *); | |
| decimal128 * decimal128Canonical(decimal128 *, const decimal128 *); | |
| #endif |