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+/*
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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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+ */
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+
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+#if defined(__CC_ARM) || defined(__CLANG_ARM) || defined (__IAR_SYSTEMS_ICC__)
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+#include <time.h>
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+#include <rtthread.h>
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+
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+/* seconds per day */
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+#define SPD 24*60*60
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+
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+
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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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+static long int timezone;
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+static const char days[] = "Sun Mon Tue Wed Thu Fri Sat ";
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+static const char months[] = "Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec ";
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+
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+/*
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+ * Structure returned by gettimeofday(2) system call,
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+ * and used in other calls.
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+ */
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+struct timeval {
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+ long tv_sec; /* seconds */
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+ long tv_usec; /* and microseconds */
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+};
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+
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+/* seconds per day */
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+#define SPD 24*60*60
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+
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+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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+
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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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+
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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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+
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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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+ return r;
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+}
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+
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+#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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+#if _DLIB_TIME_USES_64
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+struct tm* __gmtime64(const time_t* t)
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+#else
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+struct tm* __gmtime32(const time_t* t)
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+#endif
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+#else
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+struct tm* gmtime(const time_t* t)
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+#endif
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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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+
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+/*TODO timezone is not supprt now */
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+struct tm* localtime_r(const time_t* t, struct tm* r)
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+{
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+ return gmtime_r(t, r);
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+}
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+
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+#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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+#if _DLIB_TIME_USES_64
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+struct tm* __localtime64(const time_t* t)
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+#else
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+struct tm* __localtime32(const time_t* t)
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+#endif
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+#else
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+struct tm* localtime(const time_t* t)
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+#endif
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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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+
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+#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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+#if _DLIB_TIME_USES_64
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+time_t __mktime64(struct tm * const t)
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+#else
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+time_t __mktime32(struct tm * const t)
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+#endif
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+#else
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+time_t mktime(struct tm * const t)
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+#endif
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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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+
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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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+
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+ if (t->tm_year < 70)
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+ return (time_t) - 1;
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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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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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+
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+#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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+#if _DLIB_TIME_USES_64
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+char* __ctime64(const time_t *timep)
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+#else
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+char* __ctime32(const time_t *timep)
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+#endif
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+#else
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+char* ctime(const time_t *timep)
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+#endif
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+{
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+ return asctime(localtime(timep));
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+}
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+
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+#ifdef RT_USING_DEVICE
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+int gettimeofday(struct timeval *tp, void *ignore)
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+{
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+ time_t time;
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+ rt_device_t device;
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+
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+ device = rt_device_find("rtc");
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+ RT_ASSERT(device != RT_NULL);
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+
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+ rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
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+ if (tp != RT_NULL)
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+ {
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+ tp->tv_sec = time;
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+ tp->tv_usec = 0;
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+ }
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+
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+ return time;
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+}
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+#endif
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+
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+#ifndef _gettimeofday
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+/* Dummy function when hardware do not have RTC */
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+int _gettimeofday( struct timeval *tv, void *ignore)
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+{
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+ tv->tv_sec = 0; // convert to seconds
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+ tv->tv_usec = 0; // get remaining microseconds
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+ return 0; // return non-zero for error
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+}
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+#endif
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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 time_t return timestamp current.
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+ *
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+ */
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+/* for IAR 6.2 later Compiler */
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+#if defined (__IAR_SYSTEMS_ICC__) && (__VER__) >= 6020000
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+#pragma module_name = "?time"
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+#if _DLIB_TIME_USES_64
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+time_t __time64(time_t *t)
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+#else
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+time_t __time32(time_t *t)
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+#endif
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+#else
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+time_t time(time_t *t)
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+#endif
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+{
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+ time_t time_now = 0;
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+
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+#ifdef RT_USING_RTC
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+ static rt_device_t device = RT_NULL;
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+
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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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+
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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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+
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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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+
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+ return time_now;
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+}
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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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+#endif
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zhangjun