80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/*
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* Copyright (c) 2001-2006, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <time.h>
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/* Number of days per month (except for February in leap years). */
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static const int monoff[] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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static int
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is_leap_year(int year)
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{
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return year % 4 == 0 && (year % 100 != 0 || year % 400 == 0);
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}
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static int
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leap_days(int y1, int y2)
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{
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--y1;
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--y2;
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return (y2/4 - y1/4) - (y2/100 - y1/100) + (y2/400 - y1/400);
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}
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/*
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* Code adapted from Python 2.4.1 sources (Lib/calendar.py).
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*/
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time_t
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timegm(const struct tm *tm)
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{
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int year;
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time_t days;
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time_t hours;
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time_t minutes;
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time_t seconds;
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year = 1900 + tm->tm_year;
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days = 365 * (year - 1970) + leap_days(1970, year);
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days += monoff[tm->tm_mon];
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if (tm->tm_mon > 1 && is_leap_year(year))
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++days;
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days += tm->tm_mday - 1;
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hours = days * 24 + tm->tm_hour;
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minutes = hours * 60 + tm->tm_min;
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seconds = minutes * 60 + tm->tm_sec;
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return seconds;
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}
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