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less ram

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This commit is contained in:
J. Nick Koston
2026-01-29 22:53:29 -06:00
parent bd056b3b9e
commit 8708f96de4
1 changed files with 25 additions and 15 deletions
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40
esphome/components/time/posix_tz.cpp
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@@ -44,14 +44,21 @@ static int epoch_to_year(time_t epoch) {
}
int days_in_month(int year, int month) {
static const int DAYS_PER_MONTH[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
if (month == 2 && is_leap_year(year))
return 29;
return DAYS_PER_MONTH[month - 1];
switch (month) {
case 2:
return is_leap_year(year) ? 29 : 28;
case 4:
case 6:
case 9:
case 11:
return 30;
default:
return 31;
}
}
// Zeller-like algorithm for day of week (0 = Sunday)
int day_of_week(int year, int month, int day) {
int __attribute__((noinline)) day_of_week(int year, int month, int day) {
// Adjust for January/February
if (month < 3) {
month += 12;
@@ -123,7 +130,7 @@ bool skip_tz_name(const char *&p) {
return (p - start) >= 3;
}
int32_t parse_offset(const char *&p) {
int32_t __attribute__((noinline)) parse_offset(const char *&p) {
int sign = 1;
if (*p == '-') {
sign = -1;
@@ -157,23 +164,26 @@ static void parse_transition_time(const char *&p, DSTRule &rule) {
}
}
void julian_to_month_day(int julian_day, int &out_month, int &out_day) {
void __attribute__((noinline)) julian_to_month_day(int julian_day, int &out_month, int &out_day) {
// J format: day 1-365, Feb 29 is NOT counted even in leap years
// So day 60 is always March 1
static const int DAYS_BEFORE_MONTH[] = {0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
// Iterate forward through months (no array needed)
int remaining = julian_day;
out_month = 1;
for (int m = 11; m >= 0; m--) {
if (julian_day > DAYS_BEFORE_MONTH[m]) {
out_month = m + 1;
out_day = julian_day - DAYS_BEFORE_MONTH[m];
while (out_month <= 12) {
// Days in month for non-leap year (J format ignores leap years)
int dim = days_in_month(2001, out_month); // 2001 is non-leap year
if (remaining <= dim) {
out_day = remaining;
return;
}
remaining -= dim;
out_month++;
}
out_day = julian_day;
out_day = remaining;
}
void day_of_year_to_month_day(int day_of_year, int year, int &out_month, int &out_day) {
void __attribute__((noinline)) day_of_year_to_month_day(int day_of_year, int year, int &out_month, int &out_day) {
// Plain format: day 0-365, Feb 29 IS counted in leap years
// Day 0 = Jan 1
int remaining = day_of_year;