decimal32.h (4105B)
1/* Decimal 32-bit format module header for the decNumber C Library. 2 Copyright (C) 2005, 2007 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 2, or (at your option) any later 10 version. 11 12 In addition to the permissions in the GNU General Public License, 13 the Free Software Foundation gives you unlimited permission to link 14 the compiled version of this file into combinations with other 15 programs, and to distribute those combinations without any 16 restriction coming from the use of this file. (The General Public 17 License restrictions do apply in other respects; for example, they 18 cover modification of the file, and distribution when not linked 19 into a combine executable.) 20 21 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 22 WARRANTY; without even the implied warranty of MERCHANTABILITY or 23 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 24 for more details. 25 26 You should have received a copy of the GNU General Public License 27 along with GCC; see the file COPYING. If not, write to the Free 28 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 29 02110-1301, USA. */ 30 31/* ------------------------------------------------------------------ */ 32/* Decimal 32-bit format module header */ 33/* ------------------------------------------------------------------ */ 34 35#ifndef DECIMAL32_H 36#define DECIMAL32_H 37 38 #define DEC32NAME "decimal32" /* Short name */ 39 #define DEC32FULLNAME "Decimal 32-bit Number" /* Verbose name */ 40 #define DEC32AUTHOR "Mike Cowlishaw" /* Who to blame */ 41 42 /* parameters for decimal32s */ 43 #define DECIMAL32_Bytes 4 /* length */ 44 #define DECIMAL32_Pmax 7 /* maximum precision (digits) */ 45 #define DECIMAL32_Emax 96 /* maximum adjusted exponent */ 46 #define DECIMAL32_Emin -95 /* minimum adjusted exponent */ 47 #define DECIMAL32_Bias 101 /* bias for the exponent */ 48 #define DECIMAL32_String 15 /* maximum string length, +1 */ 49 #define DECIMAL32_EconL 6 /* exp. continuation length */ 50 /* highest biased exponent (Elimit-1) */ 51 #define DECIMAL32_Ehigh (DECIMAL32_Emax+DECIMAL32_Bias-DECIMAL32_Pmax+1) 52 53 /* check enough digits, if pre-defined */ 54 #if defined(DECNUMDIGITS) 55 #if (DECNUMDIGITS<DECIMAL32_Pmax) 56 #error decimal32.h needs pre-defined DECNUMDIGITS>=7 for safe use 57 #endif 58 #endif 59 60 #ifndef DECNUMDIGITS 61 #define DECNUMDIGITS DECIMAL32_Pmax /* size if not already defined*/ 62 #endif 63 #include "libdecnumber/decNumber.h" 64 65 /* Decimal 32-bit type, accessible by bytes */ 66 typedef struct { 67 uint8_t bytes[DECIMAL32_Bytes]; /* decimal32: 1, 5, 6, 20 bits*/ 68 } decimal32; 69 70 /* special values [top byte excluding sign bit; last two bits are */ 71 /* don't-care for Infinity on input, last bit don't-care for NaN] */ 72 #if !defined(DECIMAL_NaN) 73 #define DECIMAL_NaN 0x7c /* 0 11111 00 NaN */ 74 #define DECIMAL_sNaN 0x7e /* 0 11111 10 sNaN */ 75 #define DECIMAL_Inf 0x78 /* 0 11110 00 Infinity */ 76 #endif 77 78 /* ---------------------------------------------------------------- */ 79 /* Routines */ 80 /* ---------------------------------------------------------------- */ 81 82 83 /* String conversions */ 84 decimal32 * decimal32FromString(decimal32 *, const char *, decContext *); 85 char * decimal32ToString(const decimal32 *, char *); 86 char * decimal32ToEngString(const decimal32 *, char *); 87 88 /* decNumber conversions */ 89 decimal32 * decimal32FromNumber(decimal32 *, const decNumber *, 90 decContext *); 91 decNumber * decimal32ToNumber(const decimal32 *, decNumber *); 92 93 /* Format-dependent utilities */ 94 uint32_t decimal32IsCanonical(const decimal32 *); 95 decimal32 * decimal32Canonical(decimal32 *, const decimal32 *); 96 97#endif