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131 lines
3.0 KiB
131 lines
3.0 KiB
/**
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* TODO file description
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*
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* Created on 2019/09/13.
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*/
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#ifndef CSPEMU_DATETIME_H
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#define CSPEMU_DATETIME_H
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#include <stdbool.h>
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#include <stdint.h>
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enum weekday {
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MONDAY = 1,
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TUESDAY,
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WEDNESDAY,
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THURSDAY,
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FRIDAY,
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SATURDAY,
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SUNDAY
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};
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_Static_assert(MONDAY==1, "enum weekday numbering Mon");
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_Static_assert(SUNDAY==7, "enum weekday numbering Sun");
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enum month {
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JANUARY = 1,
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FEBRUARY,
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MARCH,
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APRIL,
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MAY,
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JUNE,
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JULY,
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AUGUST,
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SEPTEMBER,
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OCTOBER,
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NOVEMBER,
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DECEMBER
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};
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_Static_assert(JANUARY==1, "enum month numbering Jan");
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_Static_assert(DECEMBER==12, "enum month numbering Dec");
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/** Abbreviated weekday names */
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extern const char *DT_WKDAY_NAMES[];
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/** Full-length weekday names */
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extern const char *DT_WKDAY_NAMES_FULL[];
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/** Abbreviated month names */
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extern const char *DT_MONTH_NAMES[];
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/** Full-length month names */
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extern const char *DT_MONTH_NAMES_FULL[];
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typedef struct datetime {
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uint16_t year;
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enum month month;
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uint8_t day;
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uint8_t hour;
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uint8_t min;
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uint8_t sec;
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enum weekday wkday; // 1=monday
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} datetime_t;
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// Templates for printf
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#define DT_FORMAT_DATE "%d/%d/%d"
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#define DT_SUBS_DATE(dt) (dt).year, (dt).month, (dt).day
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#define DT_FORMAT_TIME "%d:%02d:%02d"
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#define DT_SUBS_TIME(dt) (dt).hour, (dt).min, (dt).sec
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#define DT_FORMAT_DATE_WK DT_FORMAT_WK " " DT_FORMAT_DATE
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#define DT_SUBS_DATE_WK(dt) DT_SUBS_WK(dt), DT_SUBS_DATE(dt)
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#define DT_FORMAT_WK "%s"
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#define DT_SUBS_WK(dt) DT_WKDAY_NAMES[(dt).wkday]
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#define DT_FORMAT_DATE_TIME DT_FORMAT_DATE " " DT_FORMAT_TIME
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#define DT_SUBS_DATE_TIME(dt) DT_SUBS_DATE(dt), DT_SUBS_TIME(dt)
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#define DT_FORMAT DT_FORMAT_DATE_WK " " DT_FORMAT_TIME
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#define DT_SUBS(dt) DT_SUBS_DATE_WK(dt), DT_SUBS_TIME(dt)
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// base century for two-digit year conversions
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#define DT_CENTURY 2000
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// start year for weekday computation
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#define DT_START_YEAR 2019
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// January 1st weekday of DT_START_YEAR
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#define DT_START_WKDAY TUESDAY
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// max date supported by 2-digit year RTC counters (it can't check Y%400==0 with only two digits)
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#define DT_END_YEAR 2399
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typedef union __attribute__((packed)) {
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struct __attribute__((packed)) {
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uint8_t ones : 4;
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uint8_t tens : 4;
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};
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uint8_t byte;
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} bcd_t;
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_Static_assert(sizeof(bcd_t) == 1, "Bad bcd_t len");
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/** Check if a year is leap */
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static inline bool is_leap_year(int year)
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{
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return year % 400 == 0 || (year % 4 == 0 && year % 100 != 0);
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}
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/**
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* Check if a datetime could be valid (ignores leap years)
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*
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* @param[in] dt
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* @return basic validations passed
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*/
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bool datetime_is_valid(const datetime_t *dt);
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/**
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* Set weekday based on a date in a given datetime
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*
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* @param[in,out] dt
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* @return success
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*/
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bool datetime_set_weekday(datetime_t *dt);
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/**
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* Get weekday for given a date
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*
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* @param year - year number
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* @param month - 1-based month number
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* @param day - 1-based day number
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* @return weekday
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*/
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enum weekday date_weekday(uint16_t year, enum month month, uint8_t day);
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#endif //CSPEMU_DATETIME_H
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