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scoutos / prex-0.9.0 / usr / lib / libc / time / gmtime_r.c @ 03e9c04a

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/*
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 * Copyright (c) 2005, Kohsuke Ohtani
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 * All rights reserved.
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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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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. Neither the name of the author nor the names of any co-contributors
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 *    may be used to endorse or promote products derived from this software
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 *    without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 */
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#include <sys/time.h>
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#include <tzfile.h>
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static const int daysinmonth[] =
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    { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
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static int
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is_leap(int year)
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{
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        return (isleap(year) ? 1 : 0);
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}
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struct tm *
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gmtime_r(const time_t *timep, struct tm *tmp)
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{
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        time_t t;
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        int days, year, mon;
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        int i;
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        t = *timep;
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        days = t / 60 / 60 / 24;
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        for (year = 1970, i = DAYSPERNYEAR + is_leap(year);
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             days >= i;
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             year++, i = DAYSPERNYEAR + is_leap(year))
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                days -= i;
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        tmp->tm_year = year - 1900;
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        tmp->tm_yday = days;
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        for (mon = 0; ; mon++) {
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                i = daysinmonth[mon];
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                if (mon == 1 && is_leap(year))
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                        i++;
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                if (days < i)
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                        break;
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                days -= i;
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        }
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        tmp->tm_mon = mon;
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        tmp->tm_mday = days + 1;
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        tmp->tm_wday = (int) ((1970 + days) % DAYSPERWEEK);
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        tmp->tm_sec = t % 60;
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        tmp->tm_min = (t / 60) % 60;
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        tmp->tm_hour = (t / 60 / 60) % 24;
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        tmp->tm_isdst = 0;
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        return tmp;
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}