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56 lines
1.7 KiB
C
56 lines
1.7 KiB
C
/* timegm.c --- Implementation of replacement timegm function.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 3, or (at
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your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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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
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02110-1301, USA. */
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/* Copyright 2013 Blake Jones. */
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#include <time.h>
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#include "compat.h"
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static int
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leapyear (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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/*
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* This is a simple implementation of timegm() which does what is needed
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* by create_output() -- just turns the "struct tm" into a GMT time_t.
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* It does not normalize any of the fields of the "struct tm", nor does
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* it set tm_wday or tm_yday.
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*/
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time_t
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timegm (struct tm *tm)
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{
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int monthlen[2][12] = {
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{ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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{ 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
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};
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int year, month, days;
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days = 365 * (tm->tm_year - 70);
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for (year = 70; year < tm->tm_year; year++) {
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if (leapyear(1900 + year)) {
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days++;
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}
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}
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for (month = 0; month < tm->tm_mon; month++) {
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days += monthlen[leapyear(1900 + year)][month];
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}
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days += tm->tm_mday - 1;
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return ((((days * 24) + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec);
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}
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