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/**
* @file
* For systems lacking timegm()
*
* @authors
* Copyright (C) 2022 Claes Nästén <pekdon@gmail.com>
*
* @copyright
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 2 of the License, or (at your option) any later
* version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @page neo_timegm For systems lacking timegm()
*
* For systems lacking timegm()
*/
#include "config.h"
#include <stdbool.h>
#include <time.h>
/**
* is_leap_year - Is this a Leap Year?
* @param year Year
* @retval true It's a leap year
*/
static bool is_leap_year(int year)
{
return ((year % 400) == 0) || ((year % 4) == 0) && ((year % 100) != 0);
}
/**
* tm_to_sec - Convert a time structure to number of seconds since the epoch
* @param tm Time structure
* @retval num Seconds since the epoch
*/
static time_t tm_to_sec(struct tm *tm)
{
time_t val = tm->tm_sec + (tm->tm_min * 60) + (tm->tm_hour * 3600) + (tm->tm_yday * 86400);
int year = 1900 + tm->tm_year;
for (int i = 1970; i < year; i++)
{
if (is_leap_year(i))
val += (366 * 86400);
else
val += (365 * 86400);
}
return val;
}
/**
* timegm - Convert struct tm to time_t seconds since epoch
* @param tm Time to convert to seconds since epoch
* @retval num Seconds since epoch
*/
time_t timegm(struct tm *tm)
{
return tm_to_sec(tm);
}
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