/* GLIB - Library of useful routines for C programming

 * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald

 * Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

 *

 * 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/. 

 */

/* 

 * MT safe

 */

#include "config.h"

#define DEBUG_MSG(x)	/* */

#ifdef G_ENABLE_DEBUG

/* #define DEBUG_MSG(args)	g_message args ; */

#endif

#include "glib.h"

#include <time.h>

#include <string.h>

#include <stdlib.h>

#include <locale.h>

#include "galias.h"

#ifdef __SYMBIAN32__

#include <glib_wsd.h>

#endif /* __SYMBIAN32__ */

#if EMULATOR

#define g_thread_functions_for_glib_use (*_g_thread_functions_for_glib_use())

#define g_thread_use_default_impl (*_g_thread_use_default_impl())

#endif /* EMULATOR */

EXPORT_C GDate*

g_date_new (void)

{

  GDate *d = g_new0 (GDate, 1); /* happily, 0 is the invalid flag for everything. */

  return d;

}

EXPORT_C GDate*

g_date_new_dmy (GDateDay day, GDateMonth m, GDateYear y)

{

  GDate *d;

  g_return_val_if_fail (g_date_valid_dmy (day, m, y), NULL);

  d = g_new (GDate, 1);

  d->julian = FALSE;

  d->dmy    = TRUE;

  d->month = m;

  d->day   = day;

  d->year  = y;

  g_assert (g_date_valid (d));

  return d;

}

EXPORT_C GDate*

g_date_new_julian (guint32 j)

{

  GDate *d;

  g_return_val_if_fail (g_date_valid_julian (j), NULL);

  d = g_new (GDate, 1);

  d->julian = TRUE;

  d->dmy    = FALSE;

  d->julian_days = j;

  g_assert (g_date_valid (d));

  return d;

}

EXPORT_C void

g_date_free (GDate *d)

{

  g_return_if_fail (d != NULL);

  g_free (d);

}

EXPORT_C gboolean     

g_date_valid (const GDate *d)

{

  g_return_val_if_fail (d != NULL, FALSE);

  return (d->julian || d->dmy);

}

static const guint8 days_in_months[2][13] = 

{  /* error, jan feb mar apr may jun jul aug sep oct nov dec */

  {  0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, 

  {  0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } /* leap year */

};

static const guint16 days_in_year[2][14] = 

{  /* 0, jan feb mar apr may  jun  jul  aug  sep  oct  nov  dec */

  {  0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, 

  {  0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }

};

EXPORT_C gboolean     

g_date_valid_month (GDateMonth   m)

{ 

  return ( (m > G_DATE_BAD_MONTH) && (m < 13) );

}

EXPORT_C gboolean     

g_date_valid_year (GDateYear    y)

{

  return ( y > G_DATE_BAD_YEAR );

}

EXPORT_C gboolean     

g_date_valid_day (GDateDay     d)

{

  return ( (d > G_DATE_BAD_DAY) && (d < 32) );

}

EXPORT_C gboolean     

g_date_valid_weekday (GDateWeekday w)

{

  return ( (w > G_DATE_BAD_WEEKDAY) && (w < 8) );

}

EXPORT_C gboolean     

g_date_valid_julian (guint32      j)

{

  return (j > G_DATE_BAD_JULIAN);

}

EXPORT_C gboolean     

g_date_valid_dmy (GDateDay     d, 

                  GDateMonth   m, 

		  GDateYear    y)

{

  return ( (m > G_DATE_BAD_MONTH) &&

           (m < 13)               && 

           (d > G_DATE_BAD_DAY)   && 

           (y > G_DATE_BAD_YEAR)  &&   /* must check before using g_date_is_leap_year */

           (d <=  (g_date_is_leap_year (y) ? 

		   days_in_months[1][m] : days_in_months[0][m])) );

}

/* "Julian days" just means an absolute number of days, where Day 1 ==

 *   Jan 1, Year 1

 */

static void

g_date_update_julian (const GDate *const_d)

{

  GDate *d = (GDate *) const_d;

  GDateYear year;

  gint index;

  g_return_if_fail (d != NULL);

  g_return_if_fail (d->dmy);

  g_return_if_fail (!d->julian);

  g_return_if_fail (g_date_valid_dmy (d->day, d->month, d->year));

  /* What we actually do is: multiply years * 365 days in the year,

   *  add the number of years divided by 4, subtract the number of

   *  years divided by 100 and add the number of years divided by 400,

   *  which accounts for leap year stuff. Code from Steffen Beyer's

   *  DateCalc. 

   */

  year = d->year - 1; /* we know d->year > 0 since it's valid */

  d->julian_days = year * 365U;

  d->julian_days += (year >>= 2); /* divide by 4 and add */

  d->julian_days -= (year /= 25); /* divides original # years by 100 */

  d->julian_days += year >> 2;    /* divides by 4, which divides original by 400 */

  index = g_date_is_leap_year (d->year) ? 1 : 0;

  d->julian_days += days_in_year[index][d->month] + d->day;

  g_return_if_fail (g_date_valid_julian (d->julian_days));

  d->julian = TRUE;

}

static void 

g_date_update_dmy (const GDate *const_d)

{

  GDate *d = (GDate *) const_d;

  GDateYear y;

  GDateMonth m;

  GDateDay day;

  guint32 A, B, C, D, E, M;

  g_return_if_fail (d != NULL);

  g_return_if_fail (d->julian);

  g_return_if_fail (!d->dmy);

  g_return_if_fail (g_date_valid_julian (d->julian_days));

  /* Formula taken from the Calendar FAQ; the formula was for the

   *  Julian Period which starts on 1 January 4713 BC, so we add

   *  1,721,425 to the number of days before doing the formula.

   *

   * I'm sure this can be simplified for our 1 January 1 AD period

   * start, but I can't figure out how to unpack the formula.  

   */

  A = d->julian_days + 1721425 + 32045;

  B = ( 4 *(A + 36524) )/ 146097 - 1;

  C = A - (146097 * B)/4;

  D = ( 4 * (C + 365) ) / 1461 - 1;

  E = C - ((1461*D) / 4);

  M = (5 * (E - 1) + 2)/153;

  m = M + 3 - (12*(M/10));

  day = E - (153*M + 2)/5;

  y = 100 * B + D - 4800 + (M/10);

#ifdef G_ENABLE_DEBUG

  if (!g_date_valid_dmy (day, m, y)) 

    {

      g_warning ("\nOOPS julian: %u  computed dmy: %u %u %u\n", 

		 d->julian_days, day, m, y);

    }

#endif

  d->month = m;

  d->day   = day;

  d->year  = y;

  d->dmy = TRUE;

}

EXPORT_C GDateWeekday 

g_date_get_weekday (const GDate *d)

{

  g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_WEEKDAY);

  if (!d->julian) 

    {

      g_date_update_julian (d);

    }

  g_return_val_if_fail (d->julian, G_DATE_BAD_WEEKDAY);

  return ((d->julian_days - 1) % 7) + 1;

}

EXPORT_C GDateMonth   

g_date_get_month (const GDate *d)

{

  g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, G_DATE_BAD_MONTH);

  return d->month;

}

EXPORT_C GDateYear    

g_date_get_year (const GDate *d)

{

  g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, G_DATE_BAD_YEAR);  

  return d->year;

}

EXPORT_C GDateDay     

g_date_get_day (const GDate *d)

{

  g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, G_DATE_BAD_DAY);  

  return d->day;

}

EXPORT_C guint32      

g_date_get_julian (const GDate *d)

{

  g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_JULIAN);

  if (!d->julian) 

    {

      g_date_update_julian (d);

    }

  g_return_val_if_fail (d->julian, G_DATE_BAD_JULIAN);  

  return d->julian_days;

}

EXPORT_C guint        

g_date_get_day_of_year (const GDate *d)

{

  gint index;

  g_return_val_if_fail (g_date_valid (d), 0);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, 0);  

  index = g_date_is_leap_year (d->year) ? 1 : 0;

  return (days_in_year[index][d->month] + d->day);

}

EXPORT_C guint        

g_date_get_monday_week_of_year (const GDate *d)

{

  GDateWeekday wd;

  guint day;

  GDate first;

  g_return_val_if_fail (g_date_valid (d), 0);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, 0);  

  g_date_clear (&first, 1);

  g_date_set_dmy (&first, 1, 1, d->year);

  wd = g_date_get_weekday (&first) - 1; /* make Monday day 0 */

  day = g_date_get_day_of_year (d) - 1;

  return ((day + wd)/7U + (wd == 0 ? 1 : 0));

}

EXPORT_C guint        

g_date_get_sunday_week_of_year (const GDate *d)

{

  GDateWeekday wd;

  guint day;

  GDate first;

  g_return_val_if_fail (g_date_valid (d), 0);

  if (!d->dmy) 

    {

      g_date_update_dmy (d);

    }

  g_return_val_if_fail (d->dmy, 0);  

  g_date_clear (&first, 1);

  g_date_set_dmy (&first, 1, 1, d->year);

  wd = g_date_get_weekday (&first);

  if (wd == 7) wd = 0; /* make Sunday day 0 */

  day = g_date_get_day_of_year (d) - 1;

  return ((day + wd)/7U + (wd == 0 ? 1 : 0));

}

/**

 * g_date_get_iso8601_week_of_year:

 * @date: a valid #GDate

 *

 * Returns the week of the year, where weeks are interpreted according

 * to ISO 8601. 

 * 

 * Returns: ISO 8601 week number of the year.

 *

 * Since: 2.6

 **/

EXPORT_C guint

g_date_get_iso8601_week_of_year (const GDate *d)

{

  guint j, d4, L, d1, w;

  g_return_val_if_fail (g_date_valid (d), 0);

  if (!d->julian)

    g_date_update_julian (d);

  g_return_val_if_fail (d->julian, 0);

  /* Formula taken from the Calendar FAQ; the formula was for the

   * Julian Period which starts on 1 January 4713 BC, so we add

   * 1,721,425 to the number of days before doing the formula. 

   */

  j  = d->julian_days + 1721425;

  d4 = (j + 31741 - (j % 7)) % 146097 % 36524 % 1461;

  L  = d4 / 1460;

  d1 = ((d4 - L) % 365) + L;

  w  = d1 / 7 + 1;

  return w;

}

EXPORT_C gint

g_date_days_between (const GDate *d1,

		     const GDate *d2)

{

  g_return_val_if_fail (g_date_valid (d1), 0);

  g_return_val_if_fail (g_date_valid (d2), 0);

  return (gint)g_date_get_julian (d2) - (gint)g_date_get_julian (d1);

}

EXPORT_C void         

g_date_clear (GDate *d, guint ndates)

{

  g_return_if_fail (d != NULL);

  g_return_if_fail (ndates != 0);

  memset (d, 0x0, ndates*sizeof (GDate)); 

}

#if EMULATOR

PLS_MACRO(g_date_global,gdate,GStaticMutex)

PLS_ARRAY(long_month_names, gdate, gchar *)

PLS_ARRAY(short_month_names, gdate, gchar *)

PLS(current_locale,gdate, gchar *)

PLS_ARRAY(dmy_order, gdate, GDateDMY)

PLS(using_twodigit_years,gdate, gboolean)

PLS(locale_era_adjust,gdate, gint)

#define g__g_date_global_lock (*FUNCTION_NAME_MACRO(g_date_global,gdate)())

#define long_month_names (FUNCTION_NAME(long_month_names,gdate)())

#define short_month_names (FUNCTION_NAME(short_month_names,gdate)())

#define current_locale  (*FUNCTION_NAME(current_locale ,gdate)())

#define dmy_order (FUNCTION_NAME(dmy_order,gdate)())

#define using_twodigit_years   (*FUNCTION_NAME(using_twodigit_years  ,gdate)())

#define locale_era_adjust (*FUNCTION_NAME(locale_era_adjust,gdate)())

#else

G_LOCK_DEFINE_STATIC (g_date_global);

/* These are for the parser, output to the user should use *

 * g_date_strftime () - this creates more never-freed memory to annoy

 * all those memory debugger users. :-) 

 */

static gchar *long_month_names[13] = 

{ 

  "Error", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 

};

static gchar *short_month_names[13] = 

{

  "Error", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 

};

/* This tells us if we need to update the parse info */

static gchar *current_locale = NULL;

/* order of these in the current locale */

static GDateDMY dmy_order[3] = 

{

   G_DATE_DAY, G_DATE_MONTH, G_DATE_YEAR

};

/* It is impossible to enter a year between 1 AD and 99 AD with this

 * in effect.  

 */

static gboolean using_twodigit_years = FALSE;

/* Adjustment of locale era to AD, non-zero means using locale era

 */

static gint locale_era_adjust = 0;

#endif /* EMULATOR */

/* Where to chop two-digit years: i.e., for the 1930 default, numbers

 * 29 and below are counted as in the year 2000, numbers 30 and above

 * are counted as in the year 1900.  

 */

static const GDateYear twodigit_start_year = 1930;

struct _GDateParseTokens {

  gint num_ints;

  gint n[3];

  guint month;

};

typedef struct _GDateParseTokens GDateParseTokens;

#define NUM_LEN 10

/* HOLDS: g_date_global_lock */