355 lines
7.9 KiB
C
355 lines
7.9 KiB
C
/*
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* Copyright (c) 2006-2018, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2019-08-21 zhangjun copy from minilibc
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* 2020-09-07 Meco Man combine gcc armcc iccarm
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* 2021-02-05 Meco Man add timegm()
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* 2021-02-07 Meco Man fixed gettimeofday()
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* 2021-02-08 Meco Man add settimeofday() stime()
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* 2021-02-10 Meco Man add ctime_r() and re-implement ctime()
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* 2021-02-11 Meco Man fix bug #3183 - align days[] and months[] to 4 bytes
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* add difftime()
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* 2021-02-12 Meco Man add errno
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*/
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#include <sys/time.h>
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#include <rtthread.h>
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#ifdef RT_USING_DEVICE
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#include <rtdevice.h>
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#endif
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/* seconds per day */
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#define SPD 24*60*60
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/* days per month -- nonleap! */
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const short __spm[13] =
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{
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0,
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(31),
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(31 + 28),
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(31 + 28 + 31),
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(31 + 28 + 31 + 30),
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(31 + 28 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30),
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(31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31),
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};
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ALIGN(4) static const char days[] = "Sun Mon Tue Wed Thu Fri Sat ";
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ALIGN(4) static const char months[] = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
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static int __isleap(int year)
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{
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/* every fourth year is a leap year except for century years that are
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* not divisible by 400. */
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/* return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0)); */
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return (!(year % 4) && ((year % 100) || !(year % 400)));
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}
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static void num2str(char *c, int i)
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{
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c[0] = i / 10 + '0';
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c[1] = i % 10 + '0';
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}
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struct tm *gmtime_r(const time_t *timep, struct tm *r)
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{
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time_t i;
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register time_t work = *timep % (SPD);
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r->tm_sec = work % 60;
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work /= 60;
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r->tm_min = work % 60;
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r->tm_hour = work / 60;
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work = *timep / (SPD);
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r->tm_wday = (4 + work) % 7;
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for (i = 1970;; ++i)
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{
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register time_t k = __isleap(i) ? 366 : 365;
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if (work >= k)
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work -= k;
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else
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break;
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}
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r->tm_year = i - 1900;
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r->tm_yday = work;
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r->tm_mday = 1;
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if (__isleap(i) && (work > 58))
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{
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if (work == 59)
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r->tm_mday = 2; /* 29.2. */
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work -= 1;
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}
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for (i = 11; i && (__spm[i] > work); --i)
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;
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r->tm_mon = i;
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r->tm_mday += work - __spm[i];
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r->tm_isdst = 0;
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return r;
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}
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struct tm* gmtime(const time_t* t)
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{
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static struct tm tmp;
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return gmtime_r(t, &tmp);
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}
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/*TODO: timezone */
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struct tm* localtime_r(const time_t* t, struct tm* r)
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{
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time_t local_tz;
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int utc_plus;
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utc_plus = 0; /* GTM: UTC+0 */
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local_tz = *t + utc_plus * 3600;
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return gmtime_r(&local_tz, r);
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}
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struct tm* localtime(const time_t* t)
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{
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static struct tm tmp;
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return localtime_r(t, &tmp);
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}
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/* TODO: timezone */
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time_t mktime(struct tm * const t)
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{
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return timegm(t);
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}
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char* asctime_r(const struct tm *t, char *buf)
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{
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/* "Wed Jun 30 21:49:08 1993\n" */
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*(int*) buf = *(int*) (days + (t->tm_wday << 2));
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*(int*) (buf + 4) = *(int*) (months + (t->tm_mon << 2));
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num2str(buf + 8, t->tm_mday);
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if (buf[8] == '0')
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buf[8] = ' ';
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buf[10] = ' ';
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num2str(buf + 11, t->tm_hour);
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buf[13] = ':';
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num2str(buf + 14, t->tm_min);
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buf[16] = ':';
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num2str(buf + 17, t->tm_sec);
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buf[19] = ' ';
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num2str(buf + 20, (t->tm_year + 1900) / 100);
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num2str(buf + 22, (t->tm_year + 1900) % 100);
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buf[24] = '\n';
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return buf;
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}
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char* asctime(const struct tm *timeptr)
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{
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static char buf[25];
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return asctime_r(timeptr, buf);
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}
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char *ctime_r (const time_t * tim_p, char * result)
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{
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struct tm tm;
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return asctime_r (localtime_r (tim_p, &tm), result);
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}
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char* ctime(const time_t *tim_p)
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{
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return asctime (localtime (tim_p));
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}
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double difftime (time_t tim1, time_t tim2)
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{
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return (double)(tim1 - tim2);
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}
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/**
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* Returns the current time.
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*
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* @param time_t * t the timestamp pointer, if not used, keep NULL.
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*
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* @return The value ((time_t)-1) is returned if the calendar time is not available.
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* If timer is not a NULL pointer, the return value is also stored in timer.
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*
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*/
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RT_WEAK time_t time(time_t *t)
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{
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time_t time_now = ((time_t)-1); /* default is not available */
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#ifdef RT_USING_RTC
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static rt_device_t device = RT_NULL;
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/* optimization: find rtc device only first */
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if (device == RT_NULL)
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{
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device = rt_device_find("rtc");
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}
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/* read timestamp from RTC device */
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if (device != RT_NULL)
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{
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if (rt_device_open(device, 0) == RT_EOK)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time_now);
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rt_device_close(device);
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}
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}
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#endif /* RT_USING_RTC */
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/* if t is not NULL, write timestamp to *t */
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if (t != RT_NULL)
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{
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*t = time_now;
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}
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if(time_now == (time_t)-1)
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{
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errno = ENOSYS;
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}
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return time_now;
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}
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RT_WEAK clock_t clock(void)
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{
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return rt_tick_get();
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}
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int stime(const time_t *t)
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{
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#ifdef RT_USING_RTC
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rt_device_t device;
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/* read timestamp from RTC device. */
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device = rt_device_find("rtc");
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if (rt_device_open(device, 0) == RT_EOK)
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{
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rt_device_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, (void*)t);
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rt_device_close(device);
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}
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else
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{
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errno = ENOSYS;
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return -1;
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}
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return 0;
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#else
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errno = ENOSYS;
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return -1;
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#endif /* RT_USING_RTC */
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}
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time_t timegm(struct tm * const t)
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{
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register time_t day;
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register time_t i;
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register time_t years = t->tm_year - 70;
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if (t->tm_sec > 60)
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{
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t->tm_min += t->tm_sec / 60;
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t->tm_sec %= 60;
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}
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if (t->tm_min > 60)
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{
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t->tm_hour += t->tm_min / 60;
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t->tm_min %= 60;
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}
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if (t->tm_hour > 24)
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{
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t->tm_mday += t->tm_hour / 24;
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t->tm_hour %= 24;
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}
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if (t->tm_mon > 12)
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{
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t->tm_year += t->tm_mon / 12;
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t->tm_mon %= 12;
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}
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while (t->tm_mday > __spm[1 + t->tm_mon])
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{
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if (t->tm_mon == 1 && __isleap(t->tm_year + 1900))
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{
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--t->tm_mday;
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}
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t->tm_mday -= __spm[t->tm_mon];
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++t->tm_mon;
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if (t->tm_mon > 11)
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{
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t->tm_mon = 0;
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++t->tm_year;
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}
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}
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if (t->tm_year < 70)
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return (time_t) - 1;
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/* Days since 1970 is 365 * number of years + number of leap years since 1970 */
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day = years * 365 + (years + 1) / 4;
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/* After 2100 we have to substract 3 leap years for every 400 years
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This is not intuitive. Most mktime implementations do not support
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dates after 2059, anyway, so we might leave this out for it's
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bloat. */
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if (years >= 131)
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{
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years -= 131;
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years /= 100;
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day -= (years >> 2) * 3 + 1;
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if ((years &= 3) == 3)
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years--;
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day -= years;
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}
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day += t->tm_yday = __spm[t->tm_mon] + t->tm_mday - 1 +
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(__isleap(t->tm_year + 1900) & (t->tm_mon > 1));
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/* day is now the number of days since 'Jan 1 1970' */
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i = 7;
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t->tm_wday = (day + 4) % i; /* Sunday=0, Monday=1, ..., Saturday=6 */
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i = 24;
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day *= i;
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i = 60;
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return ((day + t->tm_hour) * i + t->tm_min) * i + t->tm_sec;
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}
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/* TODO: timezone */
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int gettimeofday(struct timeval *tv, struct timezone *tz)
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{
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time_t t = time(RT_NULL);
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if (tv != RT_NULL && t != (time_t)-1)
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{
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tv->tv_sec = t;
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tv->tv_usec = 0;
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return 0;
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}
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else
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{
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errno = ENOSYS;
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return -1;
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}
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}
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/* TODO: timezone */
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int settimeofday(const struct timeval *tv, const struct timezone *tz)
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{
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if (tv != RT_NULL)
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{
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return stime((const time_t *)&tv->tv_sec);
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}
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else
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{
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errno = ENOSYS;
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return -1;
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}
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}
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