a9d503b807
The DST code has not yet been fully tested, the upcoming movement refactor is upon us and it will integrate with the micro timezone library anyway. Revert it so that next can be merged into main. This reverts commit ac5bf8cfce67cdb5662aeea618c2eb9511f0d190, reversing changes made to 5a8a49a8c77d6d5ba0f46f0e5b51dec2daba46db.
326 lines
9.8 KiB
C
326 lines
9.8 KiB
C
/*
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* MIT License
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*
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* Copyright (c) 2021 Joey Castillo
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <math.h>
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#include "watch_utility.h"
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const char * watch_utility_get_weekday(watch_date_time date_time) {
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static const char weekdays[7][3] = {"MO", "TU", "WE", "TH", "FR", "SA", "SU"};
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return weekdays[watch_utility_get_iso8601_weekday_number(date_time.unit.year + WATCH_RTC_REFERENCE_YEAR, date_time.unit.month, date_time.unit.day) - 1];
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}
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// Per ISO8601 week starts on Monday with index 1
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uint8_t watch_utility_get_iso8601_weekday_number(uint16_t year, uint8_t month, uint8_t day) {
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year -= WATCH_RTC_REFERENCE_YEAR;
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year += 20;
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if (month <= 2) {
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month += 12;
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year--;
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}
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return ((day + (13 * (month + 1) / 5) + year + (year / 4) + 5) % 7) + 1;
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}
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// this function is from the excellent musl c library
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uint8_t watch_utility_get_weeknumber(uint16_t year, uint8_t month, uint8_t day) {
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uint8_t weekday;
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uint16_t days;
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if (use_iso_8601_weeknumber == 1) {
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weekday = ((watch_utility_get_iso8601_weekday_number(year, month, day) + 5) % 7) + 1;
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} else {
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weekday = watch_utility_get_iso8601_weekday_number(year, month, day) % 7;
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}
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days = watch_utility_days_since_new_year(year, month, day);
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int val = (days + 7U - (weekday+6U)%7) / 7;
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/* If 1 Jan is just 1-3 days past Monday,
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* the previous week is also in this year. */
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if ((weekday + 371U - days - 2) % 7 <= 2)
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val++;
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if (!val) {
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val = 52;
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/* If 31 December of prev year a Thursday,
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* or Friday of a leap year, then the
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* prev year has 53 weeks. */
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int dec31 = (weekday + 7U - days - 1) % 7;
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if (dec31 == 4 || (dec31 == 5 && is_leap(year%400-1)))
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val++;
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} else if (val == 53) {
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/* If 1 January is not a Thursday, and not
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* a Wednesday of a leap year, then this
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* year has only 52 weeks. */
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int jan1 = (weekday + 371U - days) % 7;
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if (jan1 != 4 && (jan1 != 3 || !is_leap(year)))
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val = 1;
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}
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return val;
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}
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uint8_t is_leap(uint16_t y)
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{
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y += 1900;
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return !(y%4) && ((y%100) || !(y%400));
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}
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uint16_t watch_utility_days_since_new_year(uint16_t year, uint8_t month, uint8_t day) {
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uint16_t DAYS_SO_FAR[] = {
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0, // Jan
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31, // Feb
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59, // March
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90, // April
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120, // May
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151, // June
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181, // July
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212, // August
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243, // September
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273, // October
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304, // November
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334 // December
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};
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return (is_leap(year) && (month > 2) ? 1 : 0) + DAYS_SO_FAR[month - 1] + day;
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}
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// Function taken from `src/time/__year_to_secs.c` of musl libc
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// https://musl.libc.org
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static uint32_t __year_to_secs(uint32_t year, int *is_leap)
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{
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if (year-2ULL <= 136) {
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int y = year;
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int leaps = (y-68)>>2;
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if (!((y-68)&3)) {
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leaps--;
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if (is_leap) *is_leap = 1;
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} else if (is_leap) *is_leap = 0;
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return 31536000*(y-70) + 86400*leaps;
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}
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int cycles, centuries, leaps, rem;
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if (!is_leap) is_leap = &(int){0};
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cycles = (year-100) / 400;
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rem = (year-100) % 400;
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if (rem < 0) {
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cycles--;
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rem += 400;
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}
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if (!rem) {
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*is_leap = 1;
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centuries = 0;
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leaps = 0;
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} else {
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if (rem >= 200) {
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if (rem >= 300) centuries = 3, rem -= 300;
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else centuries = 2, rem -= 200;
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} else {
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if (rem >= 100) centuries = 1, rem -= 100;
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else centuries = 0;
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}
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if (!rem) {
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*is_leap = 0;
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leaps = 0;
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} else {
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leaps = rem / 4U;
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rem %= 4U;
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*is_leap = !rem;
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}
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}
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leaps += 97*cycles + 24*centuries - *is_leap;
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return (year-100) * 31536000LL + leaps * 86400LL + 946684800 + 86400;
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}
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// Function taken from `src/time/__month_to_secs.c` of musl libc
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// https://musl.libc.org
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static int __month_to_secs(int month, int is_leap)
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{
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static const int secs_through_month[] = {
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0, 31*86400, 59*86400, 90*86400,
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120*86400, 151*86400, 181*86400, 212*86400,
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243*86400, 273*86400, 304*86400, 334*86400 };
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int t = secs_through_month[month];
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if (is_leap && month >= 2) t+=86400;
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return t;
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}
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// Function adapted from `src/time/__tm_to_secs.c` of musl libc
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// https://musl.libc.org
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uint32_t watch_utility_convert_to_unix_time(uint16_t year, uint8_t month, uint8_t day, uint8_t hour, uint8_t minute, uint8_t second, uint32_t utc_offset) {
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int is_leap;
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// POSIX tm struct starts year at 1900 and month at 0
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/time.h.html
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uint32_t timestamp = __year_to_secs(year - 1900, &is_leap);
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timestamp += __month_to_secs(month - 1, is_leap);
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// Regular conversion from musl libc
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timestamp += (day - 1) * 86400;
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timestamp += hour * 3600;
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timestamp += minute * 60;
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timestamp += second;
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timestamp -= utc_offset;
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return timestamp;
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}
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uint32_t watch_utility_date_time_to_unix_time(watch_date_time date_time, uint32_t utc_offset) {
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return watch_utility_convert_to_unix_time(date_time.unit.year + WATCH_RTC_REFERENCE_YEAR, date_time.unit.month, date_time.unit.day, date_time.unit.hour, date_time.unit.minute, date_time.unit.second, utc_offset);
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}
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#define LEAPOCH (946684800LL + 86400*(31+29))
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#define DAYS_PER_400Y (365*400 + 97)
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#define DAYS_PER_100Y (365*100 + 24)
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#define DAYS_PER_4Y (365*4 + 1)
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watch_date_time watch_utility_date_time_from_unix_time(uint32_t timestamp, uint32_t utc_offset) {
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watch_date_time retval;
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retval.reg = 0;
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int32_t days, secs;
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int32_t remdays, remsecs, remyears;
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int32_t qc_cycles, c_cycles, q_cycles;
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int32_t years, months;
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int32_t wday, yday, leap;
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static const int8_t days_in_month[] = {31,30,31,30,31,31,30,31,30,31,31,29};
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timestamp += utc_offset;
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secs = timestamp - LEAPOCH;
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days = secs / 86400;
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remsecs = secs % 86400;
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if (remsecs < 0) {
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remsecs += 86400;
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days--;
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}
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wday = (3+days)%7;
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if (wday < 0) wday += 7;
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qc_cycles = (int)(days / DAYS_PER_400Y);
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remdays = days % DAYS_PER_400Y;
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if (remdays < 0) {
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remdays += DAYS_PER_400Y;
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qc_cycles--;
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}
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c_cycles = remdays / DAYS_PER_100Y;
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if (c_cycles == 4) c_cycles--;
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remdays -= c_cycles * DAYS_PER_100Y;
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q_cycles = remdays / DAYS_PER_4Y;
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if (q_cycles == 25) q_cycles--;
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remdays -= q_cycles * DAYS_PER_4Y;
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remyears = remdays / 365;
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if (remyears == 4) remyears--;
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remdays -= remyears * 365;
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leap = !remyears && (q_cycles || !c_cycles);
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yday = remdays + 31 + 28 + leap;
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if (yday >= 365+leap) yday -= 365+leap;
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years = remyears + 4*q_cycles + 100*c_cycles + 400*qc_cycles;
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for (months=0; days_in_month[months] <= remdays; months++)
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remdays -= days_in_month[months];
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years += 2000;
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months += 2;
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if (months >= 12) {
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months -=12;
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years++;
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}
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if (years < 2020 || years > 2083) return retval;
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retval.unit.year = years - WATCH_RTC_REFERENCE_YEAR;
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retval.unit.month = months + 1;
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retval.unit.day = remdays + 1;
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retval.unit.hour = remsecs / 3600;
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retval.unit.minute = remsecs / 60 % 60;
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retval.unit.second = remsecs % 60;
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return retval;
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}
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watch_date_time watch_utility_date_time_convert_zone(watch_date_time date_time, uint32_t origin_utc_offset, uint32_t destination_utc_offset) {
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uint32_t timestamp = watch_utility_date_time_to_unix_time(date_time, origin_utc_offset);
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return watch_utility_date_time_from_unix_time(timestamp, destination_utc_offset);
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}
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watch_duration_t watch_utility_seconds_to_duration(uint32_t seconds) {
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watch_duration_t retval;
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retval.seconds = (seconds % 60);
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retval.minutes = (seconds % 3600) / 60;
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retval.hours = (seconds % 86400) / 3600;
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retval.days = seconds / 86400;
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return retval;
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}
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bool watch_utility_convert_to_12_hour(watch_date_time *date_time) {
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bool is_pm = date_time->unit.hour > 11;
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date_time->unit.hour %= 12;
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if (date_time->unit.hour == 0) date_time->unit.hour = 12;
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return is_pm;
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}
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float watch_utility_thermistor_temperature(uint16_t value, bool highside, float b_coefficient, float nominal_temperature, float nominal_resistance, float series_resistance) {
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float reading = (float)value;
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if (highside) {
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reading = (1023.0 * series_resistance) / (reading / 64.0);
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reading -= series_resistance;
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} else {
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reading = series_resistance / (65535.0 / value - 1.0);
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}
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reading = reading / nominal_resistance;
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reading = log(reading);
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reading /= b_coefficient;
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reading += 1.0 / (nominal_temperature + 273.15);
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reading = 1.0 / reading;
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reading -= 273.15;
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return reading;
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}
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uint32_t watch_utility_offset_timestamp(uint32_t now, int8_t hours, int8_t minutes, int8_t seconds) {
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uint32_t new = now;
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new += hours * 60 * 60;
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new += minutes * 60;
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new += seconds;
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return new;
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}
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uint8_t days_in_month(uint8_t month, uint16_t year) {
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static const uint8_t days_in_month[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
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uint8_t days = days_in_month[month - 1];
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if (month == 2 && is_leap(year))
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days += 1;
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return days;
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}
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