60 lines
2.1 KiB
C
60 lines
2.1 KiB
C
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/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2018 by Michael A. Sevakis
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef AP_INT_H
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#define AP_INT_H
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/* Miscellaneous large-sized integer functions */
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#include <stdbool.h>
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#include <stdint.h>
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/* return floor(log(2)*base2exp) - assists in estimating buffer sizes
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* when converting to decimal */
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static inline int base10exp(int base2exp)
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{
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/* 1292913986 = floor(2^32*log(2)) */
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static const long log10of2 = 1292913986L;
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return log10of2 * (int64_t)base2exp >> 32;
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}
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struct ap_int
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{
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long numchunks; /* number of uint32_t chunks or zero */
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long basechunk; /* chunk of start of value bits */
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uint32_t *chunks; /* pointer to chunk array (caller alloced) */
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long len; /* length of output */
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long shift; /* number of fractional bits */
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uint64_t val; /* value, if it fits and numchunks is zero */
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};
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bool round_number_string10(char *p_rdig, long len);
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/* format arbitrary-precision base 10 integer */
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char * format_ap_int10(struct ap_int *a,
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char *p_end);
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/* format arbitrary-precision base 10 fraction */
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char * format_ap_frac10(struct ap_int *a,
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char *p_start,
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long precision);
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#endif /* AP_INT_H */
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