mirror of https://github.com/aria2/aria2
81 lines
2.7 KiB
C
81 lines
2.7 KiB
C
/*
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* aria2 - The high speed download utility
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*
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* Copyright (C) 2012 Tatsuhiro Tsujikawa
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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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* In addition, as a special exception, the copyright holders give
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* permission to link the code of portions of this program with the
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* OpenSSL library under certain conditions as described in each
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* individual source file, and distribute linked combinations
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* including the two.
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* You must obey the GNU General Public License in all respects
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* for all of the code used other than OpenSSL. If you modify
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* file(s) with this exception, you may extend this exception to your
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* version of the file(s), but you are not obligated to do so. If you
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* do not wish to do so, delete this exception statement from your
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* version. If you delete this exception statement from all source
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* files in the program, then also delete it here.
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*/
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/* copyright --> */
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#include "timegm.h"
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#include <stdint.h>
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/* Counter the number of leap year in the range [0, y). The |y| is the
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year, including century (e.g., 2012) */
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static int count_leap_year(int y)
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{
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y -= 1;
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return y/4-y/100+y/400;
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}
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/* Returns nonzero if the |y| is the leap year. The |y| is the year,
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including century (e.g., 2012) */
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static int is_leap_year(int y)
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{
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return y%4 == 0 && (y%100 != 0 || y%400 == 0);
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}
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/* The number of days before ith month begins */
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static int daysum[] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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// Based on the algorithm of Python 2.7 calendar.timegm.
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time_t timegm(struct tm *tm)
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{
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int days;
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int num_leap_year;
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int64_t t;
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if(tm->tm_mon > 11) {
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return -1;
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}
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num_leap_year = count_leap_year(tm->tm_year + 1900) - count_leap_year(1970);
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days = (tm->tm_year - 70) * 365 +
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num_leap_year + daysum[tm->tm_mon] + tm->tm_mday-1;
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if(tm->tm_mon >= 2 && is_leap_year(tm->tm_year + 1900)) {
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++days;
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}
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t = ((int64_t)days * 24 + tm->tm_hour) * 3600 + tm->tm_min * 60 + tm->tm_sec;
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if(sizeof(time_t) == 4) {
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if(t < INT32_MIN || t > INT32_MAX) {
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return -1;
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}
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}
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return t;
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}
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