time64_t timestamp64(time_t (*func)(struct tm*), struct tm64* tm64) {
time64_t time;
struct tm tm;
memset(&tm, 0, sizeof(tm));
/* If this succeeds it fits in a standard struct tm */
if(tm64_to_tm(tm64, &tm) == 0) {
time = timestamp64_mktime(func, &tm);
/*
* This still would fail for 1969-12-31 23:59:59 GMT, but
* the fallback code will properly handle that case anyway.
*/
if(time != -1) {
/* Copy back updated information */
tm_to_tm64(&tm, tm64);
return time;
}
}
/*
* Convert the struct to a year that is day compatible with
* the current day.
*/
int64_t year = tm64->tm_year;
if(year < 1902) {
/* For years below the 32 bit size time_t value we need to use
* the lower comparable years */
int day = day_of_week(year, tm64->tm_mon + 1, tm64->tm_mday);
if(tm64->tm_mon == 2 && leap_year(year)) {
tm.tm_year = lower_leap_month_table[day] - 1900;
} else {
tm.tm_year = lower_common_month_table[tm.tm_mon][day] - 1900;
}
} else if(year > 2037) {
/* For years above the 32 bit size time_t value we need to use
* the lower comparable years */
int day = day_of_week(year, tm64->tm_mon + 1, tm64->tm_mday);
if(tm64->tm_mon == 2 && leap_year(year)) {
tm.tm_year = higher_leap_month_table[day] - 1900;
} else {
tm.tm_year = higher_common_month_table[tm.tm_mon][day] - 1900;
}
}
time = timestamp64_mktime(func, &tm);
tm_to_tm64(&tm, tm64);
if(year != tm64->tm_year) {
/* Correct for the changed year to do the mktime computation */
time += year_diff_to_seconds(tm64->tm_year, year, day_before_leap(tm64));
}
tm64->tm_year = year;
return time;
}
time64_t timestamp64(time_t (*func)(struct tm*), struct tm64* tm64) {
struct tm tm;
memset(&tm, 0, sizeof(tm));
/* If this succeeds it fits in a standard struct tm */
if(tm64_to_tm(tm64, &tm) == 0) {
time64_t time = (time64_t)func(&tm);
/*
* This still would fail for 1969-12-31 23:59:59 GMT, but
* the fallback code will properly handle that case anyway.
*/
if(time != -1) {
/* Copy back updated information */
tm_to_tm64(&tm, tm64);
return time;
}
}
/*
* Convert the struct to a year that is day compatible with
* the current day.
*/
int64_t year = tm64->tm_year;
if(year < 1902) {
/* For years below the 32 bit size time_t value we need to use
* the lower comparable years */
int day = day_of_week(year, tm64->tm_mon + 1, tm64->tm_mday);
if(tm64->tm_mon == 2 && leap_year(year)) {
tm.tm_year = lower_leap_month_table[day] - 1900;
} else {
tm.tm_year = lower_common_month_table[tm.tm_mon][day] - 1900;
}
} else if(year > 2037) {
/* For years above the 32 bit size time_t value we need to use
* the lower comparable years */
int day = day_of_week(year, tm64->tm_mon + 1, tm64->tm_mday);
if(tm64->tm_mon == 2 && leap_year(year)) {
tm.tm_year = higher_leap_month_table[day] - 1900;
} else {
tm.tm_year = higher_common_month_table[tm.tm_mon][day] - 1900;
}
}
time64_t time = (time64_t) func(&tm);
if(time == -1 && errno == EINVAL) {
// retry one time because of perhaps DST change. This invalid
// time due to DST change only happens if time moves forward,
// so we know we start off with DST not active.
// This happens at least on NetBSD.
tm.tm_isdst = 0;
time = (time64_t) func(&tm);
}
tm_to_tm64(&tm, tm64);
if(year != tm64->tm_year) {
/* Correct for the changed year to do the mktime computation */
time += year_diff_to_seconds(tm64->tm_year, year, day_before_leap(tm64));
}
tm64->tm_year = year;
return time;
}
