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90c52423be
We currently overflow due to wrong types used internally in rtc_mktime,
on all platforms, and we return a too small type on 32-bit.
One consumer that directly benefits from this is mktime64. Many others
may still store the result in a wrong type.
While at it, drop the redundant cast of mon in rtc_mktime (obsoleted by
714209832d).
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
110 lines
2.8 KiB
C
110 lines
2.8 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* (C) Copyright 2001
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* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
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*/
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#include <common.h>
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#include <command.h>
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#include <errno.h>
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#include <rtc.h>
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#include <linux/time.h>
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#define FEBRUARY 2
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#define STARTOFTIME 1970
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#define SECDAY 86400L
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#define SECYR (SECDAY * 365)
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#define leapyear(year) ((year) % 4 == 0)
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#define days_in_year(a) (leapyear(a) ? 366 : 365)
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#define days_in_month(a) (month_days[(a) - 1])
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static int month_offset[] = {
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0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334
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};
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/*
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* This only works for the Gregorian calendar - i.e. after 1752 (in the UK)
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*/
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int rtc_calc_weekday(struct rtc_time *tm)
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{
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int leaps_to_date;
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int last_year;
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int day;
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if (tm->tm_year < 1753)
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return -1;
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last_year = tm->tm_year - 1;
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/* Number of leap corrections to apply up to end of last year */
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leaps_to_date = last_year / 4 - last_year / 100 + last_year / 400;
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/*
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* This year is a leap year if it is divisible by 4 except when it is
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* divisible by 100 unless it is divisible by 400
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*
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* e.g. 1904 was a leap year, 1900 was not, 1996 is, and 2000 is.
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*/
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if (tm->tm_year % 4 == 0 &&
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((tm->tm_year % 100 != 0) || (tm->tm_year % 400 == 0)) &&
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tm->tm_mon > 2) {
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/* We are past Feb. 29 in a leap year */
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day = 1;
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} else {
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day = 0;
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}
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day += last_year * 365 + leaps_to_date + month_offset[tm->tm_mon - 1] +
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tm->tm_mday;
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tm->tm_wday = day % 7;
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return 0;
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}
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/*
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* Converts Gregorian date to seconds since 1970-01-01 00:00:00.
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* Assumes input in normal date format, i.e. 1980-12-31 23:59:59
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* => year=1980, mon=12, day=31, hour=23, min=59, sec=59.
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*
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* [For the Julian calendar (which was used in Russia before 1917,
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* Britain & colonies before 1752, anywhere else before 1582,
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* and is still in use by some communities) leave out the
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* -year / 100 + year / 400 terms, and add 10.]
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*
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* This algorithm was first published by Gauss (I think).
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*/
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time64_t rtc_mktime(const struct rtc_time *tm)
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{
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int mon = tm->tm_mon;
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int year = tm->tm_year;
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unsigned long days;
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time64_t hours;
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mon -= 2;
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if (0 >= mon) { /* 1..12 -> 11, 12, 1..10 */
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mon += 12; /* Puts Feb last since it has leap day */
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year -= 1;
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}
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days = (unsigned long)(year / 4 - year / 100 + year / 400 +
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367 * mon / 12 + tm->tm_mday) +
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year * 365 - 719499;
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hours = days * 24 + tm->tm_hour;
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return (hours * 60 + tm->tm_min) * 60 + tm->tm_sec;
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}
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/* for compatibility with linux code */
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time64_t mktime64(const unsigned int year, const unsigned int mon,
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const unsigned int day, const unsigned int hour,
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const unsigned int min, const unsigned int sec)
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{
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struct rtc_time time;
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time.tm_year = year;
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time.tm_mon = mon;
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time.tm_mday = day;
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time.tm_hour = hour;
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time.tm_min = min;
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time.tm_sec = sec;
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return rtc_mktime((const struct rtc_time *)&time);
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}
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