Annotation of prex/usr/lib/libc/time/gmtime_r.c, Revision 1.1
1.1 ! nbrk 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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