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4d2b54ff8b
2001-06-01 Jon Trowbridge <trow@gnu.org>
* gdate.c (g_date_update_julian): Changed to take a const
argument, and then to cast out const.
(g_date_update_dmy): Changed to take a const argument, and then
cast out const.
(g_date_get_weekday): Changed argument to be const.
(g_date_get_month): Changed argument to be const.
(g_date_get_year): Changed argument to be const.
(g_date_get_day): Changed argument to be const.
(g_date_get_julian): Changed argument to be const.
(g_date_get_day_of_year): Changed argument to be const.
(g_date_get_monday_week_of_year): Changed argument to be const.
(g_date_get_sunday_week_of_year): Changed argument to be const.
(g_date_compare): Changed arguments to be const.
(g_date_to_struct_tm): Changed GDate argument to be const.
(g_date_strftime): Changed GDate argument to be const.
(g_date_clamp): Added. The equivalent of the CLAMP macro for
GDates.
(g_date_order): Added. Ensure that the first GDate argument
preceeds the second, swapping them if necessary.
(g_date_days_between): Added. Computes the (signed) number of days
between two dates.
253 lines
10 KiB
C
253 lines
10 KiB
C
/* GLIB - Library of useful routines for C programming
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* Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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/*
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* Modified by the GLib Team and others 1997-2000. See the AUTHORS
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* file for a list of people on the GLib Team. See the ChangeLog
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* files for a list of changes. These files are distributed with
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* GLib at ftp://ftp.gtk.org/pub/gtk/.
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*/
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#ifndef __G_DATE_H__
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#define __G_DATE_H__
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#include <gquark.h>
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G_BEGIN_DECLS
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/* GDate
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*
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* Date calculations (not time for now, to be resolved). These are a
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* mutant combination of Steffen Beyer's DateCalc routines
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* (http://www.perl.com/CPAN/authors/id/STBEY/) and Jon Trowbridge's
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* date routines (written for in-house software). Written by Havoc
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* Pennington <hp@pobox.com>
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*/
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typedef gint32 GTime;
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typedef guint16 GDateYear;
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typedef guint8 GDateDay; /* day of the month */
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typedef struct _GDate GDate;
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/* make struct tm known without having to include time.h */
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struct tm;
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/* enum used to specify order of appearance in parsed date strings */
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typedef enum
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{
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G_DATE_DAY = 0,
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G_DATE_MONTH = 1,
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G_DATE_YEAR = 2
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} GDateDMY;
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/* actual week and month values */
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typedef enum
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{
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G_DATE_BAD_WEEKDAY = 0,
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G_DATE_MONDAY = 1,
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G_DATE_TUESDAY = 2,
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G_DATE_WEDNESDAY = 3,
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G_DATE_THURSDAY = 4,
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G_DATE_FRIDAY = 5,
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G_DATE_SATURDAY = 6,
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G_DATE_SUNDAY = 7
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} GDateWeekday;
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typedef enum
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{
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G_DATE_BAD_MONTH = 0,
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G_DATE_JANUARY = 1,
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G_DATE_FEBRUARY = 2,
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G_DATE_MARCH = 3,
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G_DATE_APRIL = 4,
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G_DATE_MAY = 5,
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G_DATE_JUNE = 6,
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G_DATE_JULY = 7,
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G_DATE_AUGUST = 8,
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G_DATE_SEPTEMBER = 9,
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G_DATE_OCTOBER = 10,
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G_DATE_NOVEMBER = 11,
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G_DATE_DECEMBER = 12
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} GDateMonth;
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#define G_DATE_BAD_JULIAN 0U
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#define G_DATE_BAD_DAY 0U
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#define G_DATE_BAD_YEAR 0U
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/* Note: directly manipulating structs is generally a bad idea, but
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* in this case it's an *incredibly* bad idea, because all or part
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* of this struct can be invalid at any given time. Use the functions,
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* or you will get hosed, I promise.
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*/
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struct _GDate
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{
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guint julian_days : 32; /* julian days representation - we use a
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* bitfield hoping that 64 bit platforms
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* will pack this whole struct in one big
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* int
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*/
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guint julian : 1; /* julian is valid */
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guint dmy : 1; /* dmy is valid */
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/* DMY representation */
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guint day : 6;
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guint month : 4;
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guint year : 16;
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};
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/* g_date_new() returns an invalid date, you then have to _set() stuff
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* to get a usable object. You can also allocate a GDate statically,
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* then call g_date_clear() to initialize.
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*/
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GDate* g_date_new (void);
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GDate* g_date_new_dmy (GDateDay day,
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GDateMonth month,
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GDateYear year);
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GDate* g_date_new_julian (guint32 julian_day);
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void g_date_free (GDate *date);
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/* check g_date_valid() after doing an operation that might fail, like
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* _parse. Almost all g_date operations are undefined on invalid
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* dates (the exceptions are the mutators, since you need those to
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* return to validity).
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*/
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gboolean g_date_valid (const GDate *date);
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gboolean g_date_valid_day (GDateDay day) G_GNUC_CONST;
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gboolean g_date_valid_month (GDateMonth month) G_GNUC_CONST;
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gboolean g_date_valid_year (GDateYear year) G_GNUC_CONST;
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gboolean g_date_valid_weekday (GDateWeekday weekday) G_GNUC_CONST;
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gboolean g_date_valid_julian (guint32 julian_date) G_GNUC_CONST;
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gboolean g_date_valid_dmy (GDateDay day,
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GDateMonth month,
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GDateYear year) G_GNUC_CONST;
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GDateWeekday g_date_get_weekday (const GDate *date);
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GDateMonth g_date_get_month (const GDate *date);
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GDateYear g_date_get_year (const GDate *date);
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GDateDay g_date_get_day (const GDate *date);
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guint32 g_date_get_julian (const GDate *date);
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guint g_date_get_day_of_year (const GDate *date);
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/* First monday/sunday is the start of week 1; if we haven't reached
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* that day, return 0. These are not ISO weeks of the year; that
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* routine needs to be added.
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* these functions return the number of weeks, starting on the
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* corrsponding day
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*/
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guint g_date_get_monday_week_of_year (const GDate *date);
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guint g_date_get_sunday_week_of_year (const GDate *date);
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/* If you create a static date struct you need to clear it to get it
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* in a sane state before use. You can clear a whole array at
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* once with the ndates argument.
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*/
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void g_date_clear (GDate *date,
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guint n_dates);
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/* The parse routine is meant for dates typed in by a user, so it
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* permits many formats but tries to catch common typos. If your data
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* needs to be strictly validated, it is not an appropriate function.
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*/
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void g_date_set_parse (GDate *date,
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const gchar *str);
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void g_date_set_time (GDate *date,
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GTime time);
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void g_date_set_month (GDate *date,
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GDateMonth month);
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void g_date_set_day (GDate *date,
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GDateDay day);
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void g_date_set_year (GDate *date,
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GDateYear year);
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void g_date_set_dmy (GDate *date,
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GDateDay day,
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GDateMonth month,
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GDateYear y);
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void g_date_set_julian (GDate *date,
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guint32 julian_date);
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gboolean g_date_is_first_of_month (const GDate *date);
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gboolean g_date_is_last_of_month (const GDate *date);
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/* To go forward by some number of weeks just go forward weeks*7 days */
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void g_date_add_days (GDate *date,
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guint n_days);
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void g_date_subtract_days (GDate *date,
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guint n_days);
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/* If you add/sub months while day > 28, the day might change */
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void g_date_add_months (GDate *date,
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guint n_months);
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void g_date_subtract_months (GDate *date,
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guint n_months);
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/* If it's feb 29, changing years can move you to the 28th */
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void g_date_add_years (GDate *date,
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guint n_years);
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void g_date_subtract_years (GDate *date,
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guint n_years);
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gboolean g_date_is_leap_year (GDateYear year) G_GNUC_CONST;
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guint8 g_date_get_days_in_month (GDateMonth month,
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GDateYear year) G_GNUC_CONST;
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guint8 g_date_get_monday_weeks_in_year (GDateYear year) G_GNUC_CONST;
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guint8 g_date_get_sunday_weeks_in_year (GDateYear year) G_GNUC_CONST;
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/* Returns the number of days between the two dates. If date2 comes
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before date1, a negative value is return. */
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gint g_date_days_between (const GDate *date1,
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const GDate *date2);
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/* qsort-friendly (with a cast...) */
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gint g_date_compare (const GDate *lhs,
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const GDate *rhs);
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void g_date_to_struct_tm (const GDate *date,
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struct tm *tm);
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void g_date_clamp (GDate *date,
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const GDate *min_date,
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const GDate *max_date);
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/* Swap date1 and date2's values if date1 > date2. */
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void g_date_order (GDate *date1, GDate *date2);
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/* Just like strftime() except you can only use date-related formats.
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* Using a time format is undefined.
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*/
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gsize g_date_strftime (gchar *s,
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gsize slen,
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const gchar *format,
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const GDate *date);
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#ifndef G_DISABLE_DEPRECATED
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#define g_date_weekday g_date_get_weekday
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#define g_date_month g_date_get_month
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#define g_date_year g_date_get_year
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#define g_date_day g_date_get_day
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#define g_date_julian g_date_get_julian
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#define g_date_day_of_year g_date_get_day_of_year
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#define g_date_monday_week_of_year g_date_get_monday_week_of_year
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#define g_date_sunday_week_of_year g_date_get_sunday_week_of_year
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#define g_date_days_in_month g_date_get_days_in_month
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#define g_date_monday_weeks_in_year g_date_get_monday_weeks_in_year
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#define g_date_sunday_weeks_in_year g_date_get_sunday_weeks_in_year
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#endif /* G_DISABLE_DEPRECATED */
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G_END_DECLS
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#endif /* __G_DATE_H__ */
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