93 lines
4.4 KiB
C
93 lines
4.4 KiB
C
/*
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*
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* Created: 29.03.2018
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*
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* Authors:
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*
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* Assembled from the code released on Stackoverflow by:
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* Dennis (instructable.com/member/nqtronix) |
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* https://stackoverflow.com/questions/23032002/c-c-how-to-get-integer-unix-timestamp-of-build-time-not-string
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* and
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* Alexis Wilke |
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* https://stackoverflow.com/questions/10538444/do-you-know-of-a-c-macro-to-compute-unix-time-and-date
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*
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* Assembled by Jean Rabault
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*
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* UNIX_TIMESTAMP gives the UNIX timestamp (unsigned long integer of seconds
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* since 1st Jan 1970) of compilation from macros using the compiler defined
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* __TIME__ macro. This should include Gregorian calendar leap days, in
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* particular the 29ths of February, 100 and 400 years modulo leaps.
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*
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* Careful: __TIME__ is the local time of the computer, NOT the UTC time in
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* general!
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*
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*/
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#ifndef COMPILE_TIME_H_
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#define COMPILE_TIME_H_
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// Some definitions for calculation
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#define SEC_PER_MIN 60UL
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#define SEC_PER_HOUR 3600UL
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#define SEC_PER_DAY 86400UL
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#define SEC_PER_YEAR (SEC_PER_DAY * 365)
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// extracts 1..4 characters from a string and interprets it as a decimal value
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#define CONV_STR2DEC_1(str, i) (str[i] > '0' ? str[i] - '0' : 0)
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#define CONV_STR2DEC_2(str, i) (CONV_STR2DEC_1(str, i) * 10 + str[i + 1] - '0')
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#define CONV_STR2DEC_3(str, i) (CONV_STR2DEC_2(str, i) * 10 + str[i + 2] - '0')
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#define CONV_STR2DEC_4(str, i) (CONV_STR2DEC_3(str, i) * 10 + str[i + 3] - '0')
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// Custom "glue logic" to convert the month name to a usable number
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#define GET_MONTH(str, i) \
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(str[i] == 'J' && str[i + 1] == 'a' && str[i + 2] == 'n' ? 1 \
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: str[i] == 'F' && str[i + 1] == 'e' && str[i + 2] == 'b' ? 2 \
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: str[i] == 'M' && str[i + 1] == 'a' && str[i + 2] == 'r' ? 3 \
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: str[i] == 'A' && str[i + 1] == 'p' && str[i + 2] == 'r' ? 4 \
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: str[i] == 'M' && str[i + 1] == 'a' && str[i + 2] == 'y' ? 5 \
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: str[i] == 'J' && str[i + 1] == 'u' && str[i + 2] == 'n' ? 6 \
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: str[i] == 'J' && str[i + 1] == 'u' && str[i + 2] == 'l' ? 7 \
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: str[i] == 'A' && str[i + 1] == 'u' && str[i + 2] == 'g' ? 8 \
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: str[i] == 'S' && str[i + 1] == 'e' && str[i + 2] == 'p' ? 9 \
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: str[i] == 'O' && str[i + 1] == 'c' && str[i + 2] == 't' ? 10 \
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: str[i] == 'N' && str[i + 1] == 'o' && str[i + 2] == 'v' ? 11 \
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: str[i] == 'D' && str[i + 1] == 'e' && str[i + 2] == 'c' ? 12 \
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: 0)
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// extract the information from the time string given by __TIME__ and __DATE__
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#define __TIME_SECONDS__ CONV_STR2DEC_2(__TIME__, 6)
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#define __TIME_MINUTES__ CONV_STR2DEC_2(__TIME__, 3)
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#define __TIME_HOURS__ CONV_STR2DEC_2(__TIME__, 0)
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#define __TIME_DAYS__ CONV_STR2DEC_2(__DATE__, 4)
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#define __TIME_MONTH__ GET_MONTH(__DATE__, 0)
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#define __TIME_YEARS__ CONV_STR2DEC_4(__DATE__, 7)
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// Days in February
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#define _UNIX_TIMESTAMP_FDAY(year) \
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(((year) % 400) == 0UL ? 29UL \
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: (((year) % 100) == 0UL ? 28UL : (((year) % 4) == 0UL ? 29UL : 28UL)))
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// Days in the year
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#define _UNIX_TIMESTAMP_YDAY(year, month, day) \
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(/* January */ day /* February */ + (month >= 2 ? 31UL : 0UL) /* March */ + \
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(month >= 3 ? _UNIX_TIMESTAMP_FDAY(year) : 0UL) /* April */ + \
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(month >= 4 ? 31UL : 0UL) /* May */ + (month >= 5 ? 30UL : 0UL) /* June */ + \
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(month >= 6 ? 31UL : 0UL) /* July */ + (month >= 7 ? 30UL : 0UL) /* August */ + \
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(month >= 8 ? 31UL : 0UL) /* September */ + (month >= 9 ? 31UL : 0UL) /* October */ + \
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(month >= 10 ? 30UL : 0UL) /* November */ + (month >= 11 ? 31UL : 0UL) /* December */ + \
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(month >= 12 ? 30UL : 0UL))
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// get the UNIX timestamp from a digits representation
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#define _UNIX_TIMESTAMP(year, month, day, hour, minute, second) \
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(/* time */ second + minute * SEC_PER_MIN + hour * SEC_PER_HOUR + \
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/* year day (month + day) */ (_UNIX_TIMESTAMP_YDAY(year, month, day) - 1) * SEC_PER_DAY + \
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/* year */ (year - 1970UL) * SEC_PER_YEAR + ((year - 1969UL) / 4UL) * SEC_PER_DAY - \
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((year - 1901UL) / 100UL) * SEC_PER_DAY + ((year - 1601UL) / 400UL) * SEC_PER_DAY)
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// the UNIX timestamp
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#define UNIX_TIMESTAMP \
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(_UNIX_TIMESTAMP(__TIME_YEARS__, __TIME_MONTH__, __TIME_DAYS__, __TIME_HOURS__, \
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__TIME_MINUTES__, __TIME_SECONDS__))
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#endif
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