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/* GLIB - Library of useful routines for C programming
* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser 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.
*/
/*
* Modified by the GLib Team and others 1997-2000. See the AUTHORS
* file for a list of people on the GLib Team. See the ChangeLog
* files for a list of changes. These files are distributed with
* GLib at ftp://ftp.gtk.org/pub/gtk/.
*/
#ifndef __G_DATE_H__
#define __G_DATE_H__
#include <gquark.h>
G_BEGIN_DECLS
/* GDate
*
* Date calculations (not time for now, to be resolved). These are a
* mutant combination of Steffen Beyer's DateCalc routines
* (http://www.perl.com/CPAN/authors/id/STBEY/) and Jon Trowbridge's
* date routines (written for in-house software). Written by Havoc
* Pennington <hp@pobox.com>
*/
typedef gint32 GTime;
typedef guint16 GDateYear;
typedef guint8 GDateDay; /* day of the month */
typedef struct _GDate GDate;
/* make struct tm known without having to include time.h */
struct tm;
/* enum used to specify order of appearance in parsed date strings */
typedef enum
{
G_DATE_DAY = 0,
G_DATE_MONTH = 1,
G_DATE_YEAR = 2
} GDateDMY;
/* actual week and month values */
typedef enum
{
G_DATE_BAD_WEEKDAY = 0,
G_DATE_MONDAY = 1,
G_DATE_TUESDAY = 2,
G_DATE_WEDNESDAY = 3,
G_DATE_THURSDAY = 4,
G_DATE_FRIDAY = 5,
G_DATE_SATURDAY = 6,
G_DATE_SUNDAY = 7
} GDateWeekday;
typedef enum
{
G_DATE_BAD_MONTH = 0,
G_DATE_JANUARY = 1,
G_DATE_FEBRUARY = 2,
G_DATE_MARCH = 3,
G_DATE_APRIL = 4,
G_DATE_MAY = 5,
G_DATE_JUNE = 6,
G_DATE_JULY = 7,
G_DATE_AUGUST = 8,
G_DATE_SEPTEMBER = 9,
G_DATE_OCTOBER = 10,
G_DATE_NOVEMBER = 11,
G_DATE_DECEMBER = 12
} GDateMonth;
#define G_DATE_BAD_JULIAN 0U
#define G_DATE_BAD_DAY 0U
#define G_DATE_BAD_YEAR 0U
/* Note: directly manipulating structs is generally a bad idea, but
* in this case it's an *incredibly* bad idea, because all or part
* of this struct can be invalid at any given time. Use the functions,
* or you will get hosed, I promise.
*/
struct _GDate
{
guint julian_days : 32; /* julian days representation - we use a
* bitfield hoping that 64 bit platforms
* will pack this whole struct in one big
* int
*/
guint julian : 1; /* julian is valid */
guint dmy : 1; /* dmy is valid */
/* DMY representation */
guint day : 6;
guint month : 4;
guint year : 16;
};
/* g_date_new() returns an invalid date, you then have to _set() stuff
* to get a usable object. You can also allocate a GDate statically,
* then call g_date_clear() to initialize.
*/
GDate* g_date_new (void);
GDate* g_date_new_dmy (GDateDay day,
GDateMonth month,
GDateYear year);
GDate* g_date_new_julian (guint32 julian_day);
void g_date_free (GDate *date);
/* check g_date_valid() after doing an operation that might fail, like
* _parse. Almost all g_date operations are undefined on invalid
* dates (the exceptions are the mutators, since you need those to
* return to validity).
*/
gboolean g_date_valid (GDate *date);
gboolean g_date_valid_day (GDateDay day) G_GNUC_CONST;
gboolean g_date_valid_month (GDateMonth month) G_GNUC_CONST;
gboolean g_date_valid_year (GDateYear year) G_GNUC_CONST;
gboolean g_date_valid_weekday (GDateWeekday weekday) G_GNUC_CONST;
gboolean g_date_valid_julian (guint32 julian_date) G_GNUC_CONST;
gboolean g_date_valid_dmy (GDateDay day,
GDateMonth month,
GDateYear year) G_GNUC_CONST;
GDateWeekday g_date_weekday (GDate *date);
GDateMonth g_date_month (GDate *date);
GDateYear g_date_year (GDate *date);
GDateDay g_date_day (GDate *date);
guint32 g_date_julian (GDate *date);
guint g_date_day_of_year (GDate *date);
/* First monday/sunday is the start of week 1; if we haven't reached
* that day, return 0. These are not ISO weeks of the year; that
* routine needs to be added.
* these functions return the number of weeks, starting on the
* corrsponding day
*/
guint g_date_monday_week_of_year (GDate *date);
guint g_date_sunday_week_of_year (GDate *date);
/* If you create a static date struct you need to clear it to get it
* in a sane state before use. You can clear a whole array at
* once with the ndates argument.
*/
void g_date_clear (GDate *date,
guint n_dates);
/* The parse routine is meant for dates typed in by a user, so it
* permits many formats but tries to catch common typos. If your data
* needs to be strictly validated, it is not an appropriate function.
*/
void g_date_set_parse (GDate *date,
const gchar *str);
void g_date_set_time (GDate *date,
GTime time);
void g_date_set_month (GDate *date,
GDateMonth month);
void g_date_set_day (GDate *date,
GDateDay day);
void g_date_set_year (GDate *date,
GDateYear year);
void g_date_set_dmy (GDate *date,
GDateDay day,
GDateMonth month,
GDateYear y);
void g_date_set_julian (GDate *date,
guint32 julian_date);
gboolean g_date_is_first_of_month (GDate *date);
gboolean g_date_is_last_of_month (GDate *date);
/* To go forward by some number of weeks just go forward weeks*7 days */
void g_date_add_days (GDate *date,
guint n_days);
void g_date_subtract_days (GDate *date,
guint n_days);
/* If you add/sub months while day > 28, the day might change */
void g_date_add_months (GDate *date,
guint n_months);
void g_date_subtract_months (GDate *date,
guint n_months);
/* If it's feb 29, changing years can move you to the 28th */
void g_date_add_years (GDate *date,
guint n_years);
void g_date_subtract_years (GDate *date,
guint n_years);
gboolean g_date_is_leap_year (GDateYear year) G_GNUC_CONST;
guint8 g_date_days_in_month (GDateMonth month,
GDateYear year) G_GNUC_CONST;
guint8 g_date_monday_weeks_in_year (GDateYear year) G_GNUC_CONST;
guint8 g_date_sunday_weeks_in_year (GDateYear year) G_GNUC_CONST;
/* qsort-friendly (with a cast...) */
gint g_date_compare (GDate *lhs,
GDate *rhs);
void g_date_to_struct_tm (GDate *date,
struct tm *tm);
/* Just like strftime() except you can only use date-related formats.
* Using a time format is undefined.
*/
gsize g_date_strftime (gchar *s,
gsize slen,
const gchar *format,
GDate *date);
G_END_DECLS
#endif /* __G_DATE_H__ */
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