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bb815eafaf
We now have implement all of Musl's localization code, the same way that Musl implements localization. You may need setlocale(LC_ALL, "C.UTF-8"), just in case anything stops working as expected.
82 lines
1.8 KiB
C
82 lines
1.8 KiB
C
#include "time_impl.h"
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#include <limits.h>
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/* 2000-03-01 (mod 400 year, immediately after feb29 */
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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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int __secs_to_tm(long long t, struct tm *tm)
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{
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long long days, secs, years;
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int remdays, remsecs, remyears;
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int qc_cycles, c_cycles, q_cycles;
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int months;
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int wday, yday, leap;
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static const char days_in_month[] = {31,30,31,30,31,31,30,31,30,31,31,29};
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/* Reject time_t values whose year would overflow int */
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if (t < INT_MIN * 31622400LL || t > INT_MAX * 31622400LL)
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return -1;
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secs = t - 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 = 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 + 400LL*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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if (months >= 10) {
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months -= 12;
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years++;
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}
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if (years+100 > INT_MAX || years+100 < INT_MIN)
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return -1;
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tm->tm_year = years + 100;
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tm->tm_mon = months + 2;
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tm->tm_mday = remdays + 1;
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tm->tm_wday = wday;
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tm->tm_yday = yday;
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tm->tm_hour = remsecs / 3600;
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tm->tm_min = remsecs / 60 % 60;
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tm->tm_sec = remsecs % 60;
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return 0;
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}
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