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/* timegm.c --- Implementation of replacement timegm function.
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 3, 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, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA. */
/* Copyright 2013 Blake Jones. */
#include <time.h>
#include "compat.h"
static int
leapyear (int year)
{
return ((year % 4) == 0 && ((year % 100) != 0 || (year % 400) == 0));
}
/*
* This is a simple implementation of timegm() which does what is needed
* by create_output() -- just turns the "struct tm" into a GMT time_t.
* It does not normalize any of the fields of the "struct tm", nor does
* it set tm_wday or tm_yday.
*/
time_t
timegm (struct tm *tm)
{
int monthlen[2][12] = {
{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
};
int year, month, days;
days = 365 * (tm->tm_year - 70);
for (year = 70; year < tm->tm_year; year++) {
if (leapyear(1900 + year)) {
days++;
}
}
for (month = 0; month < tm->tm_mon; month++) {
days += monthlen[leapyear(1900 + year)][month];
}
days += tm->tm_mday - 1;
return ((((days * 24) + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec);
}
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