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@@ -81,3 +81,89 @@ int __secs_to_tm(long long t, struct mytm *tm) {
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return 0;
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}
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+
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+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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+
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+long long __year_to_secs(long long year, int *is_leap)
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+{
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+ if (year-(int)2ULL <= 136) {
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+ int y = (int)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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+
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+ int cycles, centuries, leaps, rem;
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+
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+ //if (!is_leap) is_leap = &(int){0};
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+ int is_leap_val = 0;
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+ if (!is_leap){
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+ is_leap = &is_leap_val;
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+ }
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+ cycles = (int)((year-100) / 400);
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+ rem = (int)((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 / (int)4U);
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+ rem %= (int)4U;
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+ *is_leap = !rem;
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+ }
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+ }
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+
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+ leaps += 97*cycles + 24*centuries - *is_leap;
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+
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+ return (year-100) * 31536000LL + leaps * 86400LL + 946684800 + 86400;
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+}
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+
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+long long __tm_to_secs(const struct mytm *tm)
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+{
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+ int is_leap;
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+ long long year = tm->tm_year;
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+ int month = tm->tm_mon;
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+ if (month >= 12 || month < 0) {
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+ int adj = month / 12;
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+ month %= 12;
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+ if (month < 0) {
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+ adj--;
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+ month += 12;
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+ }
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+ year += adj;
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+ }
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+ long long t = __year_to_secs(year, &is_leap);
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+ t += __month_to_secs(month, is_leap);
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+ t += 86400LL * (tm->tm_mday-1);
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+ t += 3600LL * tm->tm_hour;
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+ t += 60LL * tm->tm_min;
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+ t += tm->tm_sec;
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+ return t;
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+}
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