89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
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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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#if defined(__CC_ARM) || defined(__CLANG_ARM) || defined (__IAR_SYSTEMS_ICC__)
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#include <sys/time.h>
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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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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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* 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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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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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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