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/*** leaps.c -- materialised leap seconds
*
* Copyright (C) 2012-2024 Sebastian Freundt
*
* Author: Sebastian Freundt <freundt@ga-group.nl>
*
* This file is part of dateutils.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the author nor the names of any contributors
* may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
***/
/* implementation part of leaps.h */
#if !defined INCLUDED_leaps_c_
#define INCLUDED_leaps_c_
#if defined HAVE_CONFIG_H
# include "config.h"
#endif /* HAVE_CONFIG_H */
#include <stdint.h>
#include <limits.h>
#include "nifty.h"
#include "leaps.h"
typedef ssize_t sidx_t;
#if !defined DEFUN
# define DEFUN
#endif /* !DEFUN */
/* this can be called roughly 100m/sec */
#define DEF_FIND_BEFORE(N, X) \
static zidx_t \
find_before_##N( \
const X v[], size_t nv, X key, zidx_t i, zidx_t min, zidx_t max) \
{ \
/* Given key K find the index of the transition before */ \
do { \
X lo, up; \
\
lo = v[i]; \
up = v[i + 1]; \
\
if (key > lo && key <= up) { \
/* found him */ \
break; \
} else if (key > up) { \
min = i + 1; \
i = (i + max) / 2; \
} else if (key <= lo) { \
max = i - 1; \
i = (i + min) / 2; \
} \
} while (max > min && i < nv); \
return i; \
} \
static const int UNUSED(defined_find_before_##name##_p)
DEF_FIND_BEFORE(ui32, uint32_t);
DEF_FIND_BEFORE(si32, int32_t);
DEF_FIND_BEFORE(ui64, uint64_t);
DEF_FIND_BEFORE(si64, int64_t);
/* public apis */
DEFUN zidx_t
leaps_before_ui32(const uint32_t fld[], size_t nfld, uint32_t key)
{
zidx_t min = 0;
zidx_t max = nfld - 1;
zidx_t this = max / 2;
return find_before_ui32(fld, nfld, key, this, min, max);
}
DEFUN zidx_t
leaps_before_si32(const int32_t fld[], size_t nfld, int32_t key)
{
zidx_t min = 0;
zidx_t max = nfld - 1;
zidx_t this = max / 2;
return find_before_si32(fld, nfld, key, this, min, max);
}
DEFUN zidx_t
leaps_before_ui64(const uint64_t fld[], size_t nfld, uint64_t key)
{
zidx_t min = 0;
zidx_t max = nfld - 1;
zidx_t this = max / 2;
return find_before_ui64(fld, nfld, key, this, min, max);
}
DEFUN zidx_t
leaps_before_si64(const int64_t fld[], size_t nfld, int64_t key)
{
zidx_t min = 0;
zidx_t max = nfld - 1;
zidx_t this = max / 2;
return find_before_si64(fld, nfld, key, this, min, max);
}
#endif /* INCLUDED_leaps_c_ */
/* leaps.c ends here */
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