351 lines
9.1 KiB
C
351 lines
9.1 KiB
C
/****************************************************************************
|
|
* libs/libc/time/lib_gmtimer.c
|
|
*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership. The
|
|
* ASF licenses this file to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance with the
|
|
* License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
* License for the specific language governing permissions and limitations
|
|
* under the License.
|
|
*
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <stdbool.h>
|
|
#include <time.h>
|
|
#include <errno.h>
|
|
#include <debug.h>
|
|
|
|
#include <nuttx/time.h>
|
|
#include <nuttx/clock.h>
|
|
|
|
/****************************************************************************
|
|
* Private Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/* Calendar/UTC conversion routines */
|
|
|
|
static void clock_utc2calendar(time_t utc, FAR int *year, FAR int *month,
|
|
FAR int *day);
|
|
#ifdef CONFIG_GREGORIAN_TIME
|
|
static void clock_utc2gregorian(time_t jdn, FAR int *year, FAR int *month,
|
|
FAR int *day);
|
|
#ifdef CONFIG_JULIAN_TIME
|
|
static void clock_utc2julian(time_t jdn, FAR int *year, FAR int *month,
|
|
FAR int *day);
|
|
#endif /* CONFIG_JULIAN_TIME */
|
|
#endif /* CONFIG_GREGORIAN_TIME */
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: clock_utc2calendar, clock_utc2gregorian, and clock_utc2julian
|
|
*
|
|
* Description:
|
|
* Calendar to UTC conversion routines. These conversions
|
|
* are based on algorithms from p. 604 of Seidelman, P. K.
|
|
* 1992. Explanatory Supplement to the Astronomical
|
|
* Almanac. University Science Books, Mill Valley.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef CONFIG_GREGORIAN_TIME
|
|
static void clock_utc2calendar(time_t utc, FAR int *year, FAR int *month,
|
|
FAR int *day)
|
|
{
|
|
#ifdef CONFIG_JULIAN_TIME
|
|
|
|
if (utc >= GREG_DUTC)
|
|
{
|
|
clock_utc2gregorian(utc + JD_OF_EPOCH, year, month, day);
|
|
}
|
|
else
|
|
{
|
|
clock_utc2julian (utc + JD_OF_EPOCH, year, month, day);
|
|
}
|
|
|
|
#else /* CONFIG_JULIAN_TIME */
|
|
|
|
clock_utc2gregorian(utc + JD_OF_EPOCH, year, month, day);
|
|
|
|
#endif /* CONFIG_JULIAN_TIME */
|
|
}
|
|
|
|
static void clock_utc2gregorian(time_t jd, FAR int *year, FAR int *month,
|
|
FAR int *day)
|
|
{
|
|
long l;
|
|
long n;
|
|
long i;
|
|
long j;
|
|
long d;
|
|
long m;
|
|
long y;
|
|
|
|
l = jd + 68569;
|
|
n = (4 * l) / 146097;
|
|
l = l - (146097 * n + 3) / 4;
|
|
i = (4000 * (l + 1)) / 1461001;
|
|
l = l - (1461 * i) / 4 + 31;
|
|
j = (80 * l) / 2447;
|
|
d = l - (2447 * j) / 80;
|
|
l = j / 11;
|
|
m = j + 2 - 12 * l;
|
|
y = 100 * (n - 49) + i + l;
|
|
|
|
*year = y;
|
|
*month = m;
|
|
*day = d;
|
|
}
|
|
|
|
#ifdef CONFIG_JULIAN_TIME
|
|
|
|
static void clock_utc2julian(time_t jd, FAR int *year, FAR int *month,
|
|
FAR int *day)
|
|
{
|
|
long j;
|
|
long k;
|
|
long l;
|
|
long n;
|
|
long d;
|
|
long i;
|
|
long m;
|
|
long y;
|
|
|
|
j = jd + 1402;
|
|
k = (j - 1) / 1461;
|
|
l = j - 1461 * k;
|
|
n = (l - 1) / 365 - l / 1461;
|
|
i = l - 365 * n + 30;
|
|
j = (80 * i) / 2447;
|
|
d = i - (2447 * j) / 80;
|
|
i = j / 11;
|
|
m = j + 2 - 12 * i;
|
|
y = 4 * k + n + i - 4716;
|
|
|
|
*year = y;
|
|
*month = m;
|
|
*day = d;
|
|
}
|
|
|
|
#endif /* CONFIG_JULIAN_TIME */
|
|
#else/* CONFIG_GREGORIAN_TIME */
|
|
|
|
/* Only handles dates since Jan 1, 1970 */
|
|
|
|
static void clock_utc2calendar(time_t days, FAR int *year, FAR int *month,
|
|
FAR int *day)
|
|
{
|
|
int value;
|
|
int min;
|
|
int max;
|
|
int tmp;
|
|
bool leapyear;
|
|
|
|
/* There is one leap year every four years, so we can get close with the
|
|
* following:
|
|
*/
|
|
|
|
value = days / (4 * 365 + 1); /* Number of 4-years periods since the epoch */
|
|
days -= value * (4 * 365 + 1); /* Remaining days */
|
|
value <<= 2; /* Years since the epoch */
|
|
|
|
/* Then we will brute force the next 0-3 years
|
|
*
|
|
* Is this year a leap year? (we'll need this later too)
|
|
*/
|
|
|
|
leapyear = clock_isleapyear(value + 1970);
|
|
|
|
/* Get the number of days in the year */
|
|
|
|
tmp = (leapyear ? 366 : 365);
|
|
|
|
/* Do we have that many days left to account for? */
|
|
|
|
while (days >= tmp)
|
|
{
|
|
/* Yes.. bump up the year and subtract the number of days in the year */
|
|
|
|
value++;
|
|
days -= tmp;
|
|
|
|
/* Is the next year a leap year? */
|
|
|
|
leapyear = clock_isleapyear(value + 1970);
|
|
|
|
/* Get the number of days in the next year */
|
|
|
|
tmp = (leapyear ? 366 : 365);
|
|
}
|
|
|
|
/* At this point, 'value' has the years since 1970 and 'days' has number
|
|
* of days into that year. 'leapyear' is true if the year in 'value' is
|
|
* a leap year.
|
|
*/
|
|
|
|
*year = 1970 + value;
|
|
|
|
/* Handle the month (zero based) */
|
|
|
|
min = 0;
|
|
max = 11;
|
|
|
|
do
|
|
{
|
|
/* Get the midpoint */
|
|
|
|
value = (min + max) >> 1;
|
|
|
|
/* Get the number of days that occurred before the beginning of the
|
|
* month following the midpoint.
|
|
*/
|
|
|
|
tmp = clock_daysbeforemonth(value + 1, leapyear);
|
|
|
|
/* Does the number of days before this month that equal or exceed the
|
|
* number of days we have remaining?
|
|
*/
|
|
|
|
if (tmp > days)
|
|
{
|
|
/* Yes.. then the month we want is somewhere from 'min' and to the
|
|
* midpoint, 'value'. Could it be the midpoint?
|
|
*/
|
|
|
|
tmp = clock_daysbeforemonth(value, leapyear);
|
|
if (tmp > days)
|
|
{
|
|
/* No... The one we want is somewhere between min and value-1 */
|
|
|
|
max = value - 1;
|
|
}
|
|
else
|
|
{
|
|
/* Yes.. 'value' contains the month that we want */
|
|
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* No... The one we want is somewhere between value+1 and max */
|
|
|
|
min = value + 1;
|
|
}
|
|
|
|
/* If we break out of the loop because min == max, then we want value
|
|
* to be equal to min == max.
|
|
*/
|
|
|
|
value = min;
|
|
}
|
|
while (min < max);
|
|
|
|
/* The selected month number is in value. Subtract the number of days in
|
|
* the selected month
|
|
*/
|
|
|
|
days -= clock_daysbeforemonth(value, leapyear);
|
|
|
|
/* At this point, value has the month into this year (zero based) and days
|
|
* has number of days into this month (zero based)
|
|
*/
|
|
|
|
*month = value + 1; /* 1-based */
|
|
*day = days + 1; /* 1-based */
|
|
}
|
|
|
|
#endif /* CONFIG_GREGORIAN_TIME */
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: gmtime_r
|
|
*
|
|
* Description:
|
|
* Time conversion (based on the POSIX API)
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct tm *gmtime_r(FAR const time_t *timep, FAR struct tm *result)
|
|
{
|
|
time_t epoch;
|
|
time_t jdn;
|
|
int year;
|
|
int month;
|
|
int day;
|
|
int hour;
|
|
int min;
|
|
int sec;
|
|
|
|
/* Get the seconds since the EPOCH */
|
|
|
|
epoch = *timep;
|
|
linfo("timer=%d\n", (int)epoch);
|
|
|
|
/* Convert to days, hours, minutes, and seconds since the EPOCH */
|
|
|
|
jdn = epoch / SEC_PER_DAY;
|
|
epoch -= SEC_PER_DAY * jdn;
|
|
|
|
hour = epoch / SEC_PER_HOUR;
|
|
epoch -= SEC_PER_HOUR * hour;
|
|
|
|
min = epoch / SEC_PER_MIN;
|
|
epoch -= SEC_PER_MIN * min;
|
|
|
|
sec = epoch;
|
|
|
|
linfo("hour=%d min=%d sec=%d\n",
|
|
(int)hour, (int)min, (int)sec);
|
|
|
|
/* Convert the days since the EPOCH to calendar day */
|
|
|
|
clock_utc2calendar(jdn, &year, &month, &day);
|
|
|
|
linfo("jdn=%d year=%d month=%d day=%d\n",
|
|
(int)jdn, (int)year, (int)month, (int)day);
|
|
|
|
/* Then return the struct tm contents */
|
|
|
|
result->tm_year = (int)year - 1900; /* Relative to 1900 */
|
|
result->tm_mon = (int)month - 1; /* zero-based */
|
|
result->tm_mday = (int)day; /* one-based */
|
|
result->tm_hour = (int)hour;
|
|
result->tm_min = (int)min;
|
|
result->tm_sec = (int)sec;
|
|
|
|
result->tm_wday = clock_dayoftheweek(day, month, year);
|
|
result->tm_yday = day - 1 +
|
|
clock_daysbeforemonth(result->tm_mon,
|
|
clock_isleapyear(year));
|
|
result->tm_isdst = 0;
|
|
result->tm_gmtoff = 0;
|
|
result->tm_zone = NULL;
|
|
|
|
return result;
|
|
}
|
|
|
|
FAR struct tm *localtime_r(FAR const time_t *timep, FAR struct tm *result)
|
|
{
|
|
return gmtime_r(timep, result);
|
|
}
|