usr/lib/libc/time/gmtime

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This source file includes following definitions.
is_leap
gmtime_r
   1 /*
   2  * Copyright (c) 2005, Kohsuke Ohtani
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. Neither the name of the author nor the names of any co-contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29 
  30 #include <sys/time.h>
  31 #include <tzfile.h>
  32 
  33 static const int daysinmonth[] =
  34     { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
  35 
  36 static int
  37 is_leap(int year)
  38 {
  39         return (isleap(year) ? 1 : 0);
  40 }
  41 
  42 struct tm *
  43 gmtime_r(const time_t *timep, struct tm *tmp)
  44 {
  45         time_t t;
  46         int days, year, mon;
  47         int i;
  48 
  49         t = *timep;
  50         days = t / 60 / 60 / 24;
  51 
  52         for (year = 1970, i = DAYSPERNYEAR + is_leap(year);
  53              days >= i;
  54              year++, i = DAYSPERNYEAR + is_leap(year))
  55                 days -= i;
  56 
  57         tmp->tm_year = year - 1900;
  58         tmp->tm_yday = days;
  59 
  60         for (mon = 0; ; mon++) {
  61                 i = daysinmonth[mon];
  62                 if (mon == 1 && is_leap(year))
  63                         i++;
  64                 if (days < i)
  65                         break;
  66                 days -= i;
  67         }
  68         tmp->tm_mon = mon;
  69         tmp->tm_mday = days + 1;
  70         tmp->tm_wday = (int) ((1970 + days) % DAYSPERWEEK);
  71 
  72         tmp->tm_sec = t % 60;
  73         tmp->tm_min = (t / 60) % 60;
  74         tmp->tm_hour = (t / 60 / 60) % 24;
  75         tmp->tm_isdst = 0;
  76         return tmp;
  77 }
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root/usr/lib/libc/time/gmtime_r.c

DEFINITIONS
