AmiTimeKeeper/ptz.h

/*-
 * Copyright (c) 2017-2021 Carsten Sonne Larsen <cs@innolan.net>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#ifndef POSIXTZ_H_INCLUDED
#define POSIXTZ_H_INCLUDED

#include <time.h>
#include <stddef.h>
#include <stdbool.h>
#include <exec/types.h>
#include <devices/timer.h>

#define JulianDay 1
#define JulianDayLeap 2
#define DayWeekMonth 3

#define CustomTypeTimezone 1
#define PosixTypeTimezone 2

#define MAX_ABBR 10
#define MAX_TRANSITIONS 138

struct PosixTimezoneOffset
{
    int sign;    // before/after 00:00:00, -1 or 1
    int hours;   // hours before/after 00:00:00 [0:167]
    int minutes; // minutes before/after 00:00:00 [0:59]
    int seconds; // seconds before/after 00:00:00 [0:59]
};

struct PosixTransition
{
    int type;    // type of transistion [0:3]
    int day;     // day of year (leap or non-leap) [0:365]
    int weekday; // day of week [0:6]
    int week;    // week of month [1:5]
    int month;   // month of year [1:12]
    struct PosixTimezoneOffset offset;
};

struct PosixTransitionTime
{
    bool isdst;
    time_t time;
};

struct PosixLocalTimezone
{
    char abbreviation[MAX_ABBR];
    struct PosixTimezoneOffset offset;
};

struct PosixTimezone
{
    int source; // time zone source [1:2]
    struct PosixLocalTimezone current;
    struct PosixLocalTimezone std;
    struct PosixLocalTimezone dst;
    struct PosixTransition start;
    struct PosixTransition end;
    struct PosixTransitionTime transitions[MAX_TRANSITIONS];
};

char *TimezoneSignChar(struct PosixLocalTimezone *);
struct PosixTimezone *InitPosixTimezone(char *);
void FreePosixTimezone(struct PosixTimezone *);
void SetPosixTimezone(struct PosixTimezone *, struct timeval *);
struct PosixTransitionTime *FindNextTransition(struct PosixTimezone *, struct timeval *);

#endif