enderice2/Fennix
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fix(userspace/libc): fix gmtime_r, localtime_r and mktime implementation

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
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EnderIce2 2025-02-22 03:22:47 +02:00
parent c12ee67592
commit f6f46d1bbe
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1 changed files with 125 additions and 58 deletions
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183
Userspace/libc/src/std/time.c
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@ -20,6 +20,11 @@
#include <stdlib.h>
#include <string.h>
static int __is_leap(int year)
{
return (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
}
export int daylight;
export long timezone;
export char *tzname[2];
@ -43,18 +48,55 @@ export struct tm *gmtime(const time_t *timer)
export struct tm *gmtime_r(const time_t *restrict timer, struct tm *restrict result)
{
if (timer == NULL || result == NULL)
{
errno = EINVAL;
return NULL;
}
time_t t = *timer;
struct tm *res = localtime(&t);
if (res == NULL)
return NULL;
*result = *res;
long days, rem;
rem = t % 86400;
days = t / 86400;
if (rem < 0)
{
rem += 86400;
days--;
}
result->tm_hour = rem / 3600;
rem %= 3600;
result->tm_min = rem / 60;
result->tm_sec = rem % 60;
int wday = (4 + days) % 7;
if (wday < 0)
wday += 7;
result->tm_wday = wday;
int year = 1970;
while (days < 0 || days >= (__is_leap(year) ? 366 : 365))
{
int yd = __is_leap(year) ? 366 : 365;
if (days >= yd)
{
days -= yd;
year++;
}
else
{
year--;
days += __is_leap(year) ? 366 : 365;
}
}
result->tm_year = year - 1900;
result->tm_yday = days;
static const int mdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int mon;
for (mon = 0; mon < 12; mon++)
{
int dim = mdays[mon];
if (mon == 1 && __is_leap(year))
dim++;
if (days >= dim)
days -= dim;
else
break;
}
result->tm_mon = mon;
result->tm_mday = days + 1;
result->tm_isdst = 0;
result->tm_gmtoff = 0;
result->tm_zone = "UTC";
return result;
@ -68,58 +110,83 @@ export struct tm *localtime(const time_t *timer)
export struct tm *localtime_r(const time_t *restrict timer, struct tm *restrict result)
{
if (timer == NULL || result == NULL)
{
errno = EINVAL;
return NULL;
}
tzset();
time_t t = *timer;
struct tm *gmt = gmtime(&t);
if (gmt == NULL)
return NULL;
*result = *gmt;
result->tm_isdst = -1;
time_t local_time = mktime(result);
if (local_time == (time_t)-1)
return NULL;
*result = *localtime(&local_time);
return result;
time_t t = *timer - timezone;
return gmtime_r(&t, result);
}
export time_t mktime(struct tm *timeptr)
{
time_t result;
int sec = timeptr->tm_sec;
int min = timeptr->tm_min;
int hour = timeptr->tm_hour;
int mon = timeptr->tm_mon;
int day = timeptr->tm_mday;
int year = timeptr->tm_year + 1900;
if (sec >= 60 || sec < 0)
{
min += sec / 60;
sec %= 60;
if (sec < 0)
{
sec += 60;
min--;
}
}
if (min >= 60 || min < 0)
{
hour += min / 60;
min %= 60;
if (min < 0)
{
min += 60;
hour--;
}
}
if (hour >= 24 || hour < 0)
{
day += hour / 24;
hour %= 24;
if (hour < 0)
{
hour += 24;
day--;
}
}
if (mon >= 12 || mon < 0)
{
year += mon / 12;
mon %= 12;
if (mon < 0)
{
mon += 12;
year--;
}
}
long days = 0;
if (year >= 1970)
{
for (int y = 1970; y < year; y++)
days += __is_leap(y) ? 366 : 365;
}
else
{
for (int y = year; y < 1970; y++)
days -= __is_leap(y) ? 366 : 365;
}
static const int mdays[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
for (int i = 0; i < mon; i++)
{
days += mdays[i];
if (i == 1 && __is_leap(year))
days++;
}
days += (day - 1);
time_t t = days * 86400 + hour * 3600 + min * 60 + sec;
t = t + timezone - (timeptr->tm_isdst > 0 ? 3600 : 0);
struct tm temp;
tzset();
temp = *timeptr;
temp.tm_sec += temp.tm_min * 60 + temp.tm_hour * 3600 + temp.tm_mday * 86400;
temp.tm_min = 0;
temp.tm_hour = 0;
temp.tm_mday = 1;
temp.tm_mon = 0;
temp.tm_year = 70;
temp.tm_isdst = -1;
result = mktime(&temp);
if (result == (time_t)-1)
return (time_t)-1;
result += timeptr->tm_sec + timeptr->tm_min * 60 + timeptr->tm_hour * 3600;
result += (timeptr->tm_mday - 1) * 86400;
result += (timeptr->tm_mon) * 2629743;
result += (timeptr->tm_year - 70) * 31556926;
struct tm *local_time = localtime(&result);
if (local_time == NULL)
return (time_t)-1;
*timeptr = *local_time;
return result;
localtime_r(&t, &temp);
*timeptr = temp;
return t;
}
export int nanosleep(const struct timespec *, struct timespec *);