100 lines
4 KiB
C
100 lines
4 KiB
C
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/* Decimal 64-bit format module header for the decNumber C Library.
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Copyright (C) 2005, 2007 Free Software Foundation, Inc.
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Contributed by IBM Corporation. Author Mike Cowlishaw.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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In addition to the permissions in the GNU General Public License,
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the Free Software Foundation gives you unlimited permission to link
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the compiled version of this file into combinations with other
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programs, and to distribute those combinations without any
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restriction coming from the use of this file. (The General Public
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License restrictions do apply in other respects; for example, they
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cover modification of the file, and distribution when not linked
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into a combine executable.)
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301, USA. */
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/* ------------------------------------------------------------------ */
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/* Decimal 64-bit format module header */
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/* ------------------------------------------------------------------ */
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#ifndef DECIMAL64_H
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#define DECIMAL64_H
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#define DEC64NAME "decimal64" /* Short name */
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#define DEC64FULLNAME "Decimal 64-bit Number" /* Verbose name */
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#define DEC64AUTHOR "Mike Cowlishaw" /* Who to blame */
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/* parameters for decimal64s */
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#define DECIMAL64_Bytes 8 /* length */
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#define DECIMAL64_Pmax 16 /* maximum precision (digits) */
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#define DECIMAL64_Emax 384 /* maximum adjusted exponent */
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#define DECIMAL64_Emin -383 /* minimum adjusted exponent */
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#define DECIMAL64_Bias 398 /* bias for the exponent */
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#define DECIMAL64_String 24 /* maximum string length, +1 */
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#define DECIMAL64_EconL 8 /* exp. continuation length */
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/* highest biased exponent (Elimit-1) */
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#define DECIMAL64_Ehigh (DECIMAL64_Emax+DECIMAL64_Bias-DECIMAL64_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<DECIMAL64_Pmax)
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#error decimal64.h needs pre-defined DECNUMDIGITS>=16 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 DECIMAL64_Pmax /* size if not already defined*/
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#endif
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#include "libdecnumber/decNumber.h"
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/* Decimal 64-bit type, accessible by bytes */
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typedef struct {
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uint8_t bytes[DECIMAL64_Bytes]; /* decimal64: 1, 5, 8, 50 bits*/
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} decimal64;
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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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decimal64 * decimal64FromString(decimal64 *, const char *, decContext *);
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char * decimal64ToString(const decimal64 *, char *);
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char * decimal64ToEngString(const decimal64 *, char *);
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/* decNumber conversions */
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decimal64 * decimal64FromNumber(decimal64 *, const decNumber *,
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decContext *);
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decNumber * decimal64ToNumber(const decimal64 *, decNumber *);
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/* Format-dependent utilities */
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uint32_t decimal64IsCanonical(const decimal64 *);
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decimal64 * decimal64Canonical(decimal64 *, const decimal64 *);
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#endif
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