libepoch/zone.c

#include "epoch.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>

int offsetNew(TzOffset *offs, offsetSign sign, uint8_t hours, uint8_t minutes) {
    if (offs == NULL) return 1;
    if (hours > 12) return 2;
    if (hours > 11 && minutes > 0) return 3;
    if (minutes > 59) return 4;
    offs->sign = sign;
    offs->hours = hours;
    offs->minutes = minutes;
    return 0;
}

void printTz(TimeZone *zone) {
    switch (zone->tag) {
    case UTC: printf("UTC");
    case Offset:
        switch (zone->offset->sign) {
        case Positive:
            puts("+");
            break;
        case Negative:
            puts("-");
            break;
        }
        default:
            break;
        printf("%.2u:%.2u", zone->offset->hours, zone->offset->minutes);
    }
}

int64_t timezoneAsSeconds(TimeZone *tz) {
    int64_t base;
    
    switch (tz->tag) {
    case Offset:
        base = (int64_t)tz->offset->hours * SECONDS_PER_HOUR + (int64_t)tz->offset->minutes * 60;
        switch (tz->offset->sign) {
        case Negative: return -base;
        default: return base;
        }
    default: return 0;
    }
}