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@@ -0,0 +1,88 @@
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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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+ * 2018-10-26 zylx first version
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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 <sys/time.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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+/* 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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+
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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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+/**
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+ * This function will convert Time (Restartable)
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+ *
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+ * @param timep the timestamp
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+ * @param the structure to stores information
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+ *
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+ * @return the structure to stores information
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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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+#endif /* end of __CC_ARM or __CLANG_ARM or __IAR_SYSTEMS_ICC__ */
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+
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