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datetime.h
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datetime.h
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/*
* $Id: datetime.h,v 1.4 2001/03/16 19:27:14 chuck Exp $
* Libmcal - Modular Calendar Access Library
* Copyright (C) 1999 Mark Musone and Andrew Skalski
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
* Contact Information:
*
* Mark Musone
*
* Andrew Skalski
*
*/
#ifndef _DATETIME_H
#define _DATETIME_H
#include <time.h>
#include "bool.h"
/**
* Represents the day of the week.
*/
typedef enum {
SUNDAY,
MONDAY,
TUESDAY,
WEDNESDAY,
THURSDAY,
FRIDAY,
SATURDAY
} weekday_t;
/**
* Represents the month of the year.
*/
typedef enum {
JANUARY = 1,
FEBRUARY,
MARCH,
APRIL,
MAY,
JUNE,
JULY,
AUGUST,
SEPTEMBER,
OCTOBER,
NOVEMBER,
DECEMBER
} month_t;
typedef enum {
DT_FORWARD,
DT_BACKWARD
} direction_t;
/**
* struct datetime
*
* Used to represent and manipulate dates in the proleptic
* Gregorian calendar.
*
*/
typedef struct datetime
{
bool has_date; /* has a date value */
int year; /* year */
int mon; /* month */
int mday; /* day of month */
bool has_time; /* has a time value */
int hour; /* hour */
int min; /* minute */
int sec; /* second */
} datetime_t;
#define DOE_MIN 1 /* January 1, 1 */
#define DOE_MAX 3652059 /* December 31, 9999 */
#define YEAR_MIN 1
#define YEAR_MAX 9999
#define DT_INIT { false, 0, 0, 0, false, 0, 0, 0 }
/** general date/time functions **/
/* returns true if <year> is a leap year */
bool isleapyear(int year);
/* returns days in <month>; if <leap> is true, gives result for leap year */
int daysinmonth(int month, bool leap);
/* returns true if the date is valid */
bool datevalid(int year, int mon, int mday);
/* returns true if the time is valid */
bool timevalid(int hour, int min, int sec);
/*********************************/
/** datetime_t related functions **/
/* initializes <dt> with no date or time */
void dt_init(datetime_t *dt);
/* fills the current date/time into <dt> */
bool dt_now(datetime_t *dt);
/* clears the date portion of <dt> */
void dt_cleardate(datetime_t *dt);
/* clears the time portion of <dt> */
void dt_cleartime(datetime_t *dt);
/* returns true if <dt> has a date */
bool dt_hasdate(const datetime_t *dt);
/* returns true if <dt> has a time */
bool dt_hastime(const datetime_t *dt);
/* returns true if <dt> has no value */
bool dt_empty(const datetime_t *dt);
/* sets <dt> from the fields of <tm> */
bool dt_settm(datetime_t *dt, const struct tm *tm);
/* sets the date portion of <dt> */
bool dt_setdate(datetime_t *dt, int year, int mon, int mday);
/* sets the time portion of <dt> */
bool dt_settime(datetime_t *dt, int hour, int min, int sec);
/* returns <0, 0, >0 if a<b, a==b, a>b respectively */
int dt_compare(const datetime_t *a, const datetime_t *b);
/* returns the day-of-year of <dt> */
int dt_dayofyear(const datetime_t *dt);
/* returns the day-of-week of <dt> */
int dt_dayofweek(const datetime_t *dt);
/* returns the day-of-epoch (1 is January 1, 1). this format has the
* property that DOW==DOE%7
*/
int dt_dayofepoch(const datetime_t *dt);
/* sets the datetime from day-of-epoch */
bool dt_setdoe(datetime_t *dt, int doe);
/* rolls the time by <hour> <min> and <sec>, spilling over into the
* date if it exists
*/
bool dt_roll_time(datetime_t *dt, int hour, int min, int sec);
/* sets <dt> to be the <wday> in the same week as <ref>, if <weekstart>
* is the first day of the week.
*/
bool dt_setweekof( datetime_t *dt, const datetime_t *ref,
weekday_t weekstart, weekday_t wday);
/* sets the datetime from year, month, week and day */
bool dt_setnthwday(datetime_t *dt, int year, int mon, int nth, int wday);
/* Returns the week number for d=day, m=month, y=year */
int dt_weekofyear(int d, int m, int y);
/* Returns the week number in the given month counting in the given direction */
int dt_orderofmonth( const datetime_t *dt, const direction_t direction);
/* convenience macros to get the first/last days of a week */
#define dt_startofweek(dt, ref, weekstart) \
dt_setweekof((dt), (ref), (weekstart), (weekstart))
#define dt_endofweek(dt, ref, weekstart) \
dt_setweekof((dt), (ref), (weekstart), (7+(weekstart)-1)%7)
#define dt_dayofweekstr(dayno) \
(dayno) >= 4 ? \
(dayno) = 6 ? \
"SA" : \
(dayno) = 5 ? \
"FR" : \
"TH" \
; \
;: \
(dayno) >= 2 ? \
(dayno) = 3 ? \
"WE" : \
"TU" \
;: \
(dayno) = 1 ? \
"MO" : \
"SU" \
; \
; \
/**********************************/
#endif