logger_default_utc_timestamp.c

Go to the documentation of this file.

/* SPDX-License-Identifier: GPL-3.0-or-later
 * Copyright (C) 2026 Sylvain Labopin
 */
 
#include "internal/logger_default_utc_timestamp.h"
 
#include "osal/time/osal_time_types.h"
 
static bool logger_default_is_leap_year(int32_t year)
{
    return ((year % 4 == 0) && (year % 100 != 0)) || (year % 400 == 0);
}
 
static int32_t logger_default_days_in_year(int32_t year)
{
    return logger_default_is_leap_year(year) ? 366 : 365;
}
 
static int32_t logger_default_days_in_month(int32_t year, int32_t month)
{
    static const int32_t DAYS_PER_MONTH[12] = {
        31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
    };
 
    int32_t days = DAYS_PER_MONTH[month - 1];
 
    if (month == 2 && logger_default_is_leap_year(year)) {
        days = 29;
    }
 
    return days;
}
 
bool logger_default_epoch_time_to_date(
    logger_default_utc_timestamp_t *out,
    const osal_time_t *time)
{
    if (!out || !time) {
        return false;
    }
 
    int64_t epoch_seconds = time->epoch_seconds;
 
    int64_t days = epoch_seconds / 86400;
    int64_t rem = epoch_seconds % 86400;
 
    if (rem < 0) {
        rem += 86400;
        days -= 1;
    }
 
    out->hour = (int32_t)(rem / 3600);
    rem %= 3600;
    out->minute = (int32_t)(rem / 60);
    out->second = (int32_t)(rem % 60);
 
    int32_t year = 1970;
 
    if (days >= 0) {
        while (days >= logger_default_days_in_year(year)) {
            days -= logger_default_days_in_year(year);
            year++;
        }
    } else {
        do {
            year--;
            days += logger_default_days_in_year(year);
        } while (days < 0);
    }
 
    out->year = year;
 
    int32_t month = 1;
    while (days >= logger_default_days_in_month(year, month)) {
        days -= logger_default_days_in_month(year, month);
        month++;
    }
 
    out->month = month;
    out->day = (int32_t)days + 1;
 
    return true;
}