55 lines
1.5 KiB
C
55 lines
1.5 KiB
C
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/**
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* @file tmtab.c
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* @note Copyright (C) 2011 Richard Cochran <richardcochran@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "tmtab.h"
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#include "tmv.h"
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void tmtab_init(struct tmtab *tt, int log_seconds)
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{
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int i;
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struct timespec incr, ts = {0, 0};
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uint64_t max, min;
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if (log_seconds < 0) {
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log_seconds *= -1;
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for (i = 1, max = 500000000ULL; i < log_seconds; i++) {
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max >>= 1;
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}
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} else {
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for (i = 0, max = 1000000000ULL; i < log_seconds; i++) {
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max <<= 1;
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}
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}
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min = max / (TMTAB_MAX - 1ULL);
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incr.tv_sec = min / 1000000000ULL;
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incr.tv_nsec = min % 1000000000ULL;
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for (i = 0; i < TMTAB_MAX; i++) {
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ts.tv_sec += incr.tv_sec;
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ts.tv_nsec += incr.tv_nsec;
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while (ts.tv_nsec >= NS_PER_SEC) {
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ts.tv_nsec -= NS_PER_SEC;
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ts.tv_sec++;
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}
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tt->ts[i] = ts;
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}
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}
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