this breaks something let me know and I will fix it.
1998-11-30 Havoc Pennington <hp@pobox.com>
* gdate.c: New file, implements calendrical calculations.
* glib.h: Added declarations for GDate module.
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
+1998-11-30 Havoc Pennington <hp@pobox.com>
+
+ * gdate.c: New file, implements calendrical calculations.
+
+ * glib.h: Added declarations for GDate module.
+
Mon Nov 30 07:12:10 1998 Tim Janik <timj@gtk.org>
* glib.h:
gcache.c \
gcompletion.c \
gdataset.c \
+ gdate.c \
gerror.c \
ghash.c \
ghook.c \
--- /dev/null
+/* 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 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.
+ */
+#include "glib.h"
+
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <locale.h>
+
+GDate*
+g_date_new ()
+{
+ GDate *d = g_new0 (GDate, 1); /* happily, 0 is the invalid flag for everything. */
+
+ return d;
+}
+
+GDate*
+g_date_new_mdy (GDateMonth m, GDateDay day, GDateYear y)
+{
+ GDate *d;
+ g_return_val_if_fail (g_date_valid_mdy (m, day, y), NULL);
+
+ d = g_new (GDate, 1);
+
+ d->julian = FALSE;
+ d->mdy = TRUE;
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ g_assert (g_date_valid (d));
+
+ return d;
+}
+
+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->mdy = FALSE;
+
+ d->julian_days = j;
+
+ g_assert (g_date_valid (d));
+
+ return d;
+}
+
+void
+g_date_free (GDate *d)
+{
+ g_return_if_fail (d != NULL);
+
+ g_free (d);
+}
+
+
+
+gboolean
+g_date_valid (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, FALSE);
+
+ if (d->julian && d->mdy)
+ {
+ return ( g_date_valid_julian (d->julian_days) &&
+ g_date_valid_mdy (d->month, d->day, d->year) );
+
+ }
+ else if (d->mdy)
+ {
+ return g_date_valid_mdy (d->month, d->day, d->year);
+ }
+ else if (d->julian)
+ {
+ return g_date_valid_julian (d->julian_days);
+ }
+ else
+ return FALSE;
+}
+
+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 }
+};
+
+gboolean
+g_date_valid_month (GDateMonth m)
+{
+ return ( (m > G_DATE_BAD_MONTH) && (m < 13) );
+}
+
+gboolean
+g_date_valid_year (GDateYear y)
+{
+ return ( y > G_DATE_BAD_YEAR );
+}
+
+gboolean
+g_date_valid_day (GDateDay d)
+{
+ return ( (d > G_DATE_BAD_DAY) && (d < 32) );
+}
+
+gboolean
+g_date_valid_weekday (GDateWeekday w)
+{
+ return ( (w > G_DATE_BAD_WEEKDAY) && (w < 8) );
+}
+
+gboolean
+g_date_valid_julian (guint32 j)
+{
+ return (j > G_DATE_BAD_JULIAN);
+}
+
+gboolean
+g_date_valid_mdy (GDateMonth m,
+ GDateDay d,
+ 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 (GDate *d)
+{
+ GDateYear year;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (d->mdy);
+ g_return_if_fail (!d->julian);
+ g_return_if_fail (g_date_valid_mdy (d->month, d->day, 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_mdy (GDate *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->mdy);
+ 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_mdy (m, day, y))
+ {
+ g_warning ("\nOOPS julian: %u computed mdy: %u %u %u\n",
+ d->julian_days, m, day, y);
+ }
+#endif
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ d->mdy = TRUE;
+}
+
+GDateWeekday
+g_date_weekday (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_WEEKDAY);
+ 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;
+}
+
+GDateMonth
+g_date_month (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_MONTH);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_MONTH);
+
+ return d->month;
+}
+
+GDateYear
+g_date_year (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_YEAR);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_YEAR);
+
+ return d->year;
+}
+
+GDateDay
+g_date_day (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_DAY);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_DAY);
+
+ return d->day;
+}
+
+guint32
+g_date_julian (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_JULIAN);
+ 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;
+}
+
+guint
+g_date_day_of_year (GDate *d)
+{
+ gint index;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ return (days_in_year[index][d->month] + d->day);
+}
+
+guint
+g_date_monday_week_of_year (GDate *d)
+{
+ GDateWeekday wd;
+ guint day;
+ GDate first;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ g_date_clear (&first, 1);
+
+ g_date_set_mdy (&first, 1, 1, d->year);
+
+ wd = g_date_weekday (&first) - 1; /* make Monday day 0 */
+ day = g_date_day_of_year (d) - 1;
+
+ return ((day + wd)/7U + (wd == 0 ? 1 : 0));
+}
+
+guint
+g_date_sunday_week_of_year (GDate *d)
+{
+ GDateWeekday wd;
+ guint day;
+ GDate first;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ g_date_clear (&first, 1);
+
+ g_date_set_mdy (&first, 1, 1, d->year);
+
+ wd = g_date_weekday (&first);
+ if (wd == 7) wd = 0; /* make Sunday day 0 */
+ day = g_date_day_of_year (d) - 1;
+
+ return ((day + wd)/7U + (wd == 0 ? 1 : 0));
+}
+
+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));
+}
+
+/* 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 GDateMDY mdy_order[3] =
+{
+ G_DATE_MONTH, G_DATE_DAY, G_DATE_YEAR
+};
+
+/* 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 GDateYear twodigit_start_year = 1930;
+
+/* It is impossible to enter a year between 1 AD and 99 AD with this
+ * in effect.
+ */
+static gboolean using_twodigit_years = FALSE;
+
+struct _GDateParseTokens {
+ gint num_ints;
+ gint n[3];
+ guint month;
+};
+
+typedef struct _GDateParseTokens GDateParseTokens;
+
+#define NUM_LEN 10
+
+static void
+g_date_fill_parse_tokens (const gchar *str, GDateParseTokens *pt)
+{
+ gchar num[4][NUM_LEN+1];
+ gint i;
+ const gchar *s;
+
+ /* We count 4, but store 3; so we can give an error
+ * if there are 4.
+ */
+ num[0][0] = num[1][0] = num[2][0] = num[3][0] = '\0';
+
+ s = str;
+ pt->num_ints = 0;
+ while (*s && pt->num_ints < 4)
+ {
+
+ i = 0;
+ while (*s && isdigit (*s) && i <= NUM_LEN)
+ {
+ num[pt->num_ints][i] = *s;
+ ++s;
+ ++i;
+ }
+
+ if (i > 0)
+ {
+ num[pt->num_ints][i] = '\0';
+ ++(pt->num_ints);
+ }
+
+ if (*s == '\0') break;
+
+ ++s;
+ }
+
+ pt->n[0] = pt->num_ints > 0 ? atoi (num[0]) : 0;
+ pt->n[1] = pt->num_ints > 1 ? atoi (num[1]) : 0;
+ pt->n[2] = pt->num_ints > 2 ? atoi (num[2]) : 0;
+
+ pt->month = G_DATE_BAD_MONTH;
+
+ if (pt->num_ints < 3)
+ {
+ gchar lcstr[128];
+ int i = 1;
+
+ strncpy (lcstr, str, 127);
+ g_strdown (lcstr);
+
+ while (i < 13)
+ {
+ if (long_month_names[i] != NULL)
+ {
+ const gchar *found = strstr (lcstr, long_month_names[i]);
+
+ if (found != NULL)
+ {
+ pt->month = i;
+ return;
+ }
+ }
+
+ if (short_month_names[i] != NULL)
+ {
+ const gchar *found = strstr (lcstr, short_month_names[i]);
+
+ if (found != NULL)
+ {
+ pt->month = i;
+ return;
+ }
+ }
+
+ ++i;
+ }
+ }
+}
+
+static void
+g_date_prepare_to_parse (const gchar *str, GDateParseTokens *pt)
+{
+ const gchar *locale = setlocale (LC_TIME, NULL);
+ gboolean recompute_localeinfo = FALSE;
+ GDate d;
+
+ g_return_if_fail (locale != NULL); /* should not happen */
+
+ g_date_clear (&d, 1); /* clear for scratch use */
+
+ if ( (current_locale == NULL) || (strcmp (locale, current_locale) != 0) )
+ {
+ recompute_localeinfo = TRUE; /* Uh, there used to be a reason for the temporary */
+ }
+
+ if (recompute_localeinfo)
+ {
+ int i = 1;
+ GDateParseTokens testpt;
+ gchar buf[128];
+
+ g_free (current_locale); /* still works if current_locale == NULL */
+
+ current_locale = g_strdup (locale);
+
+ while (i < 13)
+ {
+ g_date_set_mdy (&d, i, 1, 1);
+
+ g_return_if_fail (g_date_valid (&d));
+
+ g_date_strftime (buf, 127, "%b", &d);
+ g_free (short_month_names[i]);
+ g_strdown (buf);
+ short_month_names[i] = g_strdup (buf);
+
+
+
+ g_date_strftime (buf, 127, "%B", &d);
+ g_free (long_month_names[i]);
+ g_strdown (buf);
+ long_month_names[i] = g_strdup (buf);
+
+ ++i;
+ }
+
+ /* Determine MDY order */
+
+ g_date_set_mdy (&d, 7, 4, 1776); /* had to pick a random day */
+
+ g_date_strftime (buf, 127, "%x", &d);
+
+ g_date_fill_parse_tokens (buf, &testpt);
+
+ i = 0;
+ while (i < testpt.num_ints)
+ {
+ switch (testpt.n[i])
+ {
+ case 7:
+ mdy_order[i] = G_DATE_MONTH;
+ break;
+ case 4:
+ mdy_order[i] = G_DATE_DAY;
+ break;
+ case 76:
+ using_twodigit_years = TRUE; /* FALL THRU */
+ case 1776:
+ mdy_order[i] = G_DATE_YEAR;
+ break;
+ default:
+ /* leave it unchanged */
+ break;
+ }
+ ++i;
+ }
+
+#ifdef G_ENABLE_DEBUG
+ g_print ("\n**GDate prepared a new set of locale-specific parse rules.\n");
+ i = 1;
+ while (i < 13)
+ {
+ g_print (" %s %s\n", long_month_names[i], short_month_names[i]);
+ ++i;
+ }
+ if (using_twodigit_years)
+ {
+ g_print ("**Using twodigit years with cutoff year: %u\n", twodigit_start_year);
+ }
+ {
+ gchar *strings[3];
+ i = 0;
+ while (i < 3)
+ {
+ switch (mdy_order[i])
+ {
+ case G_DATE_MONTH:
+ strings[i] = "Month";
+ break;
+ case G_DATE_YEAR:
+ strings[i] = "Year";
+ break;
+ case G_DATE_DAY:
+ strings[i] = "Day";
+ break;
+ default:
+ strings[i] = NULL;
+ break;
+ }
+ ++i;
+ }
+ g_print ("**Order: %s, %s, %s\n", strings[0], strings[1], strings[2]);
+ g_print ("**Sample date in this locale: `%s'\n\n", buf);
+ }
+#endif
+ }
+
+ g_date_fill_parse_tokens (str, pt);
+}
+
+void
+g_date_set_parse (GDate *d,
+ const gchar *str)
+{
+ GDateParseTokens pt;
+ guint m = G_DATE_BAD_MONTH, day = G_DATE_BAD_DAY, y = G_DATE_BAD_YEAR;
+
+ g_return_if_fail (d != NULL);
+
+ /* set invalid */
+ g_date_clear (d, 1);
+
+ g_date_prepare_to_parse (str, &pt);
+
+#ifdef G_ENABLE_DEBUG
+ g_print ("Found %d ints, `%d' `%d' `%d' and written out month %d\n",
+ pt.num_ints, pt.n[0], pt.n[1], pt.n[2], pt.month);
+#endif
+
+
+ if (pt.num_ints == 4) return; /* presumably a typo; bail out. */
+
+ if (pt.num_ints > 1)
+ {
+ int i = 0;
+ int j = 0;
+
+ g_assert (pt.num_ints < 4); /* i.e., it is 2 or 3 */
+
+ while (i < pt.num_ints && j < 3)
+ {
+ switch (mdy_order[j])
+ {
+ case G_DATE_MONTH:
+ {
+ if (pt.num_ints == 2 && pt.month != G_DATE_BAD_MONTH)
+ {
+ m = pt.month;
+ ++j; /* skip months, but don't skip this number */
+ continue;
+ }
+ else
+ m = pt.n[i];
+ }
+ break;
+ case G_DATE_DAY:
+ {
+ if (pt.num_ints == 2 && pt.month == G_DATE_BAD_MONTH)
+ {
+ day = 1;
+ ++j; /* skip days, since we may have month/year */
+ continue;
+ }
+ day = pt.n[i];
+ }
+ break;
+ case G_DATE_YEAR:
+ {
+ y = pt.n[i];
+
+ if (using_twodigit_years && y < 100)
+ {
+ guint two = twodigit_start_year % 100;
+ guint century = (twodigit_start_year / 100) * 100;
+
+ if (y < two)
+ century += 100;
+
+ y += century;
+ }
+ }
+ break;
+ default:
+ break;
+ }
+
+ ++i;
+ ++j;
+ }
+
+
+ if (pt.num_ints == 3 && !g_date_valid_mdy (m, day, y))
+ {
+ /* Try YYYY MM DD */
+ y = pt.n[0];
+ m = pt.n[1];
+ day = pt.n[2];
+
+ if (using_twodigit_years && y < 100)
+ y = G_DATE_BAD_YEAR; /* avoids ambiguity */
+ }
+ }
+ else if (pt.num_ints == 1)
+ {
+ if (pt.month != G_DATE_BAD_MONTH)
+ {
+ /* Month name and year? */
+ m = pt.month;
+ day = 1;
+ y = pt.n[0];
+ }
+ else
+ {
+ /* Try yyyymmdd and yymmdd */
+
+ m = (pt.n[0]/100) % 100;
+ day = pt.n[0] % 100;
+ y = pt.n[0]/10000;
+
+ /* FIXME move this into a separate function */
+ if (using_twodigit_years && y < 100)
+ {
+ guint two = twodigit_start_year % 100;
+ guint century = (twodigit_start_year / 100) * 100;
+
+ if (y < two)
+ century += 100;
+
+ y += century;
+ }
+ }
+ }
+
+ /* See if we got anything valid out of all this. */
+ /* y < 8000 is to catch 19998 style typos; the library is OK up to 65535 or so */
+ if (y < 8000 && g_date_valid_mdy (m, day, y))
+ {
+ d->month = m;
+ d->day = day;
+ d->year = y;
+ d->mdy = TRUE;
+ }
+#ifdef G_ENABLE_DEBUG
+ else
+ g_print ("Rejected MDY %u %u %u\n", m, day, y);
+#endif
+}
+
+void
+g_date_set_time (GDate *d, time_t t)
+{
+ struct tm *tm;
+
+ g_return_if_fail (d != NULL);
+
+ tm = localtime (&t);
+
+ if (tm)
+ {
+ d->julian = FALSE;
+
+ d->month = tm->tm_mon + 1;
+ d->day = tm->tm_mday;
+ d->year = tm->tm_year + 1900;
+
+ g_return_if_fail (g_date_valid_mdy (d->month, d->day, d->year));
+
+ d->mdy = TRUE;
+ }
+ else
+ {
+ g_date_clear (d, 1);
+ }
+}
+
+void
+g_date_set_month (GDate *d,
+ GDateMonth m)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_month (m));
+
+ d->julian = FALSE;
+
+ d->month = m;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_day (GDate *d,
+ GDateDay day)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_day (day));
+
+ d->julian = FALSE;
+
+ d->day = day;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_year (GDate *d,
+ GDateYear y)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_year (y));
+
+ d->julian = FALSE;
+
+ d->year = y;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_mdy (GDate *d,
+ GDateMonth m,
+ GDateDay day,
+ GDateYear y)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_mdy (m, day, y));
+
+ d->julian = FALSE;
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ d->mdy = TRUE;
+}
+
+void
+g_date_set_julian (GDate *d, guint32 j)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_julian (j));
+
+ d->julian_days = j;
+ d->julian = TRUE;
+ d->mdy = FALSE;
+}
+
+
+gboolean
+g_date_is_first_of_month (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, FALSE);
+ g_return_val_if_fail (g_date_valid (d), FALSE);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, FALSE);
+
+ if (d->day == 1) return TRUE;
+ else return FALSE;
+}
+
+gboolean
+g_date_is_last_of_month (GDate *d)
+{
+ gint index;
+
+ g_return_val_if_fail (d != NULL, FALSE);
+ g_return_val_if_fail (g_date_valid (d), FALSE);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, FALSE);
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day == days_in_months[index][d->month]) return TRUE;
+ else return FALSE;
+}
+
+void
+g_date_add_days (GDate *d, guint ndays)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->julian)
+ {
+ g_date_update_julian (d);
+ }
+ g_return_if_fail (d->julian);
+
+ d->julian_days += ndays;
+ d->mdy = FALSE;
+}
+
+void
+g_date_subtract_days (GDate *d, guint ndays)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->julian)
+ {
+ g_date_update_julian (d);
+ }
+ g_return_if_fail (d->julian);
+ g_return_if_fail (d->julian_days > ndays);
+
+ d->julian_days -= ndays;
+ d->mdy = FALSE;
+}
+
+void
+g_date_add_months (GDate *d,
+ guint nmonths)
+{
+ guint years, months;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ nmonths += d->month - 1;
+
+ years = nmonths/12;
+ months = nmonths%12;
+
+ d->month = months + 1;
+ d->year += years;
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day > days_in_months[index][d->month])
+ d->day = days_in_months[index][d->month];
+
+ d->julian = FALSE;
+
+ g_return_if_fail (g_date_valid (d));
+}
+
+void
+g_date_subtract_months (GDate *d,
+ guint nmonths)
+{
+ guint years, months;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ years = nmonths/12;
+ months = nmonths%12;
+
+ g_return_if_fail (d->year > years);
+
+ d->year -= years;
+
+ if (d->month > months) d->month -= months;
+ else
+ {
+ months -= d->month;
+ d->month = 12 - months;
+ d->year -= 1;
+ }
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day > days_in_months[index][d->month])
+ d->day = days_in_months[index][d->month];
+
+ d->julian = FALSE;
+
+ g_return_if_fail (g_date_valid (d));
+}
+
+void
+g_date_add_years (GDate *d,
+ guint nyears)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ d->year += nyears;
+
+ if (d->month == 2 && d->day == 29)
+ {
+ if (!g_date_is_leap_year (d->year))
+ {
+ d->day = 28;
+ }
+ }
+
+ d->julian = FALSE;
+}
+
+void
+g_date_subtract_years (GDate *d,
+ guint nyears)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+ g_return_if_fail (d->year > nyears);
+
+ d->year -= nyears;
+
+ if (d->month == 2 && d->day == 29)
+ {
+ if (!g_date_is_leap_year (d->year))
+ {
+ d->day = 28;
+ }
+ }
+
+ d->julian = FALSE;
+}
+
+
+gboolean
+g_date_is_leap_year (GDateYear year)
+{
+ g_return_val_if_fail (g_date_valid_year (year), FALSE);
+
+ return ( (((year % 4) == 0) && ((year % 100) != 0)) ||
+ (year % 400) == 0 );
+}
+
+guint8
+g_date_days_in_month (GDateMonth month,
+ GDateYear year)
+{
+ gint index;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+ g_return_val_if_fail (g_date_valid_month (month), 0);
+
+ index = g_date_is_leap_year (year) ? 1 : 0;
+
+ return days_in_months[index][month];
+}
+
+guint8
+g_date_monday_weeks_in_year (GDateYear year)
+{
+ GDate d;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+
+ g_date_clear (&d, 1);
+ g_date_set_mdy (&d, 1, 1, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ g_date_set_mdy (&d, 12, 31, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ if (g_date_is_leap_year (year))
+ {
+ g_date_set_mdy (&d, 1, 2, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ g_date_set_mdy (&d, 12, 30, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ }
+ return 52;
+}
+
+guint8
+g_date_sunday_weeks_in_year (GDateYear year)
+{
+ GDate d;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+
+ g_date_clear (&d, 1);
+ g_date_set_mdy (&d, 1, 1, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ g_date_set_mdy (&d, 12, 31, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ if (g_date_is_leap_year (year))
+ {
+ g_date_set_mdy (&d, 1, 2, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ g_date_set_mdy (&d, 12, 30, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ }
+ return 52;
+}
+
+gint
+g_date_compare (GDate *lhs,
+ GDate *rhs)
+{
+ g_return_val_if_fail (lhs != NULL, 0);
+ g_return_val_if_fail (rhs != NULL, 0);
+ g_return_val_if_fail (g_date_valid (lhs), 0);
+ g_return_val_if_fail (g_date_valid (rhs), 0);
+
+ /* Remember the self-comparison case! I think it works right now. */
+
+ while (TRUE)
+ {
+
+ if (lhs->julian && rhs->julian)
+ {
+ if (lhs->julian_days < rhs->julian_days) return -1;
+ else if (lhs->julian_days > rhs->julian_days) return 1;
+ else return 0;
+ }
+ else if (lhs->mdy && rhs->mdy)
+ {
+ if (lhs->year < rhs->year) return -1;
+ else if (lhs->year > rhs->year) return 1;
+ else
+ {
+ if (lhs->month < rhs->month) return -1;
+ else if (lhs->month > rhs->month) return 1;
+ else
+ {
+ if (lhs->day < rhs->day) return -1;
+ else if (lhs->day > rhs->day) return 1;
+ else return 0;
+ }
+
+ }
+
+ }
+ else
+ {
+ if (!lhs->julian) g_date_update_julian (lhs);
+ if (!rhs->julian) g_date_update_julian (rhs);
+ g_return_val_if_fail (lhs->julian, 0);
+ g_return_val_if_fail (rhs->julian, 0);
+ }
+
+ }
+ return 0; /* warnings */
+}
+
+
+void
+g_date_to_struct_tm (GDate *d,
+ struct tm *tm)
+{
+ GDateWeekday day;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+ g_return_if_fail (tm != NULL);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ /* zero all the irrelevant fields to be sure they're valid */
+
+ /* On Linux and maybe other systems, there are weird non-POSIX
+ * fields on the end of struct tm that choke strftime if they
+ * contain garbage. So we need to 0 the entire struct, not just the
+ * fields we know to exist.
+ */
+
+ memset (tm, 0x0, sizeof (struct tm));
+
+ tm->tm_mday = d->day;
+ tm->tm_mon = d->month - 1; /* 0-11 goes in tm */
+ tm->tm_year = ((int)d->year) - 1900; /* X/Open says tm_year can be negative */
+
+ day = g_date_weekday (d);
+ if (day == 7) day = 0; /* struct tm wants days since Sunday, so Sunday is 0 */
+
+ tm->tm_wday = (int)day;
+
+ tm->tm_yday = g_date_day_of_year (d) - 1; /* 0 to 365 */
+ tm->tm_isdst = -1; /* -1 means "information not available" */
+}
+
+gsize
+g_date_strftime (gchar *s,
+ gsize slen,
+ const gchar *format,
+ GDate *d)
+{
+ struct tm tm;
+ gsize retval;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+ g_return_val_if_fail (slen > 0, 0);
+ g_return_val_if_fail (format != 0, 0);
+ g_return_val_if_fail (s != 0, 0);
+
+ g_date_to_struct_tm (d, &tm);
+
+ retval = strftime (s, slen, format, &tm);
+ if (retval == 0)
+ {
+ /* If retval == 0, the contents of s are undefined. We define
+ * them.
+ */
+ s[0] = '\0';
+ }
+ return retval;
+}
void g_completion_free (GCompletion* cmp);
+
+
+/* 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>
+ */
+
+#include <time.h>
+
+/* this enum is used to specify order of appearance in parsed date
+ * strings
+ */
+
+typedef enum {
+ G_DATE_MONTH = 0,
+ G_DATE_DAY = 1,
+ G_DATE_YEAR = 2
+} GDateMDY;
+
+/* These other types specify the actual 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;
+
+typedef guint16 GDateYear;
+typedef guint8 GDateDay; /* day of the month */
+
+#define G_DATE_BAD_JULIAN 0U
+#define G_DATE_BAD_DAY 0U
+#define G_DATE_BAD_YEAR 0U
+
+typedef struct _GDate GDate;
+
+/* 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 mdy : 1; /* mdy is valid */
+
+ /* MDY representation */
+ guint month : 4;
+ guint day : 6;
+ guint year : 16;
+};
+
+/* _new with no args 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_mdy (GDateMonth m,
+ GDateDay d,
+ GDateYear y);
+GDate* g_date_new_julian (guint32 julian_day);
+void g_date_free (GDate *d);
+
+/* 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 *d);
+gboolean g_date_valid_month (GDateMonth m);
+gboolean g_date_valid_year (GDateYear y);
+gboolean g_date_valid_day (GDateDay d);
+gboolean g_date_valid_weekday (GDateWeekday w);
+gboolean g_date_valid_julian (guint32 j);
+gboolean g_date_valid_mdy (GDateMonth m,
+ GDateDay d,
+ GDateYear y);
+
+GDateWeekday g_date_weekday (GDate *d);
+GDateMonth g_date_month (GDate *d);
+GDateYear g_date_year (GDate *d);
+GDateDay g_date_day (GDate *d);
+guint32 g_date_julian (GDate *d);
+
+guint g_date_day_of_year (GDate *d);
+
+/* 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 should be added.
+ */
+
+guint g_date_monday_week_of_year (GDate *d); /* # weeks, starting on Monday */
+guint g_date_sunday_week_of_year (GDate *d); /* # weeks, starting on Sunday */
+
+/* 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 *d,
+ guint ndates);
+
+/* 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 *d,
+ const gchar *str);
+
+void g_date_set_time (GDate *d,
+ time_t t);
+
+void g_date_set_month (GDate *d,
+ GDateMonth m);
+void g_date_set_day (GDate *d,
+ GDateDay day);
+void g_date_set_year (GDate *d,
+ GDateYear y);
+void g_date_set_mdy (GDate *d,
+ GDateMonth m,
+ GDateDay day,
+ GDateYear y);
+
+void g_date_set_julian (GDate *d,
+ guint32 j);
+
+gboolean g_date_is_first_of_month (GDate *d);
+gboolean g_date_is_last_of_month (GDate *d);
+
+
+/* To go forward by some number of weeks just go forward weeks*7 days */
+void g_date_add_days (GDate *d,
+ guint ndays);
+void g_date_subtract_days (GDate *d,
+ guint ndays);
+
+/* If you add/sub months while day > 28, the day might change */
+void g_date_add_months (GDate *d,
+ guint nmonths);
+void g_date_subtract_months (GDate *d,
+ guint nmonths);
+
+/* If it's feb 29, changing years can move you to the 28th */
+void g_date_add_years (GDate *d,
+ guint nyears);
+void g_date_subtract_years (GDate *d,
+ guint nyears);
+
+gboolean g_date_is_leap_year (GDateYear year);
+guint8 g_date_days_in_month (GDateMonth month,
+ GDateYear year);
+guint8 g_date_monday_weeks_in_year (GDateYear year);
+guint8 g_date_sunday_weeks_in_year (GDateYear year);
+
+/* qsort-friendly (with a cast...) */
+gint g_date_compare (GDate *lhs,
+ GDate *rhs);
+
+
+void g_date_to_struct_tm (GDate *d,
+ 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 *d);
+
+
+
+
/* GRelation: Indexed Relations. Imagine a really simple table in a
* database. Relations are not ordered. This data type is meant for
* maintaining a N-way mapping.
gcache.c \
gcompletion.c \
gdataset.c \
+ gdate.c \
gerror.c \
ghash.c \
ghook.c \
--- /dev/null
+/* 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 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.
+ */
+#include "glib.h"
+
+#include <string.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <locale.h>
+
+GDate*
+g_date_new ()
+{
+ GDate *d = g_new0 (GDate, 1); /* happily, 0 is the invalid flag for everything. */
+
+ return d;
+}
+
+GDate*
+g_date_new_mdy (GDateMonth m, GDateDay day, GDateYear y)
+{
+ GDate *d;
+ g_return_val_if_fail (g_date_valid_mdy (m, day, y), NULL);
+
+ d = g_new (GDate, 1);
+
+ d->julian = FALSE;
+ d->mdy = TRUE;
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ g_assert (g_date_valid (d));
+
+ return d;
+}
+
+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->mdy = FALSE;
+
+ d->julian_days = j;
+
+ g_assert (g_date_valid (d));
+
+ return d;
+}
+
+void
+g_date_free (GDate *d)
+{
+ g_return_if_fail (d != NULL);
+
+ g_free (d);
+}
+
+
+
+gboolean
+g_date_valid (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, FALSE);
+
+ if (d->julian && d->mdy)
+ {
+ return ( g_date_valid_julian (d->julian_days) &&
+ g_date_valid_mdy (d->month, d->day, d->year) );
+
+ }
+ else if (d->mdy)
+ {
+ return g_date_valid_mdy (d->month, d->day, d->year);
+ }
+ else if (d->julian)
+ {
+ return g_date_valid_julian (d->julian_days);
+ }
+ else
+ return FALSE;
+}
+
+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 }
+};
+
+gboolean
+g_date_valid_month (GDateMonth m)
+{
+ return ( (m > G_DATE_BAD_MONTH) && (m < 13) );
+}
+
+gboolean
+g_date_valid_year (GDateYear y)
+{
+ return ( y > G_DATE_BAD_YEAR );
+}
+
+gboolean
+g_date_valid_day (GDateDay d)
+{
+ return ( (d > G_DATE_BAD_DAY) && (d < 32) );
+}
+
+gboolean
+g_date_valid_weekday (GDateWeekday w)
+{
+ return ( (w > G_DATE_BAD_WEEKDAY) && (w < 8) );
+}
+
+gboolean
+g_date_valid_julian (guint32 j)
+{
+ return (j > G_DATE_BAD_JULIAN);
+}
+
+gboolean
+g_date_valid_mdy (GDateMonth m,
+ GDateDay d,
+ 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 (GDate *d)
+{
+ GDateYear year;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (d->mdy);
+ g_return_if_fail (!d->julian);
+ g_return_if_fail (g_date_valid_mdy (d->month, d->day, 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_mdy (GDate *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->mdy);
+ 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_mdy (m, day, y))
+ {
+ g_warning ("\nOOPS julian: %u computed mdy: %u %u %u\n",
+ d->julian_days, m, day, y);
+ }
+#endif
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ d->mdy = TRUE;
+}
+
+GDateWeekday
+g_date_weekday (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_WEEKDAY);
+ 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;
+}
+
+GDateMonth
+g_date_month (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_MONTH);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_MONTH);
+
+ return d->month;
+}
+
+GDateYear
+g_date_year (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_YEAR);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_YEAR);
+
+ return d->year;
+}
+
+GDateDay
+g_date_day (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_DAY);
+ g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, G_DATE_BAD_DAY);
+
+ return d->day;
+}
+
+guint32
+g_date_julian (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, G_DATE_BAD_JULIAN);
+ 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;
+}
+
+guint
+g_date_day_of_year (GDate *d)
+{
+ gint index;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ return (days_in_year[index][d->month] + d->day);
+}
+
+guint
+g_date_monday_week_of_year (GDate *d)
+{
+ GDateWeekday wd;
+ guint day;
+ GDate first;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ g_date_clear (&first, 1);
+
+ g_date_set_mdy (&first, 1, 1, d->year);
+
+ wd = g_date_weekday (&first) - 1; /* make Monday day 0 */
+ day = g_date_day_of_year (d) - 1;
+
+ return ((day + wd)/7U + (wd == 0 ? 1 : 0));
+}
+
+guint
+g_date_sunday_week_of_year (GDate *d)
+{
+ GDateWeekday wd;
+ guint day;
+ GDate first;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, 0);
+
+ g_date_clear (&first, 1);
+
+ g_date_set_mdy (&first, 1, 1, d->year);
+
+ wd = g_date_weekday (&first);
+ if (wd == 7) wd = 0; /* make Sunday day 0 */
+ day = g_date_day_of_year (d) - 1;
+
+ return ((day + wd)/7U + (wd == 0 ? 1 : 0));
+}
+
+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));
+}
+
+/* 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 GDateMDY mdy_order[3] =
+{
+ G_DATE_MONTH, G_DATE_DAY, G_DATE_YEAR
+};
+
+/* 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 GDateYear twodigit_start_year = 1930;
+
+/* It is impossible to enter a year between 1 AD and 99 AD with this
+ * in effect.
+ */
+static gboolean using_twodigit_years = FALSE;
+
+struct _GDateParseTokens {
+ gint num_ints;
+ gint n[3];
+ guint month;
+};
+
+typedef struct _GDateParseTokens GDateParseTokens;
+
+#define NUM_LEN 10
+
+static void
+g_date_fill_parse_tokens (const gchar *str, GDateParseTokens *pt)
+{
+ gchar num[4][NUM_LEN+1];
+ gint i;
+ const gchar *s;
+
+ /* We count 4, but store 3; so we can give an error
+ * if there are 4.
+ */
+ num[0][0] = num[1][0] = num[2][0] = num[3][0] = '\0';
+
+ s = str;
+ pt->num_ints = 0;
+ while (*s && pt->num_ints < 4)
+ {
+
+ i = 0;
+ while (*s && isdigit (*s) && i <= NUM_LEN)
+ {
+ num[pt->num_ints][i] = *s;
+ ++s;
+ ++i;
+ }
+
+ if (i > 0)
+ {
+ num[pt->num_ints][i] = '\0';
+ ++(pt->num_ints);
+ }
+
+ if (*s == '\0') break;
+
+ ++s;
+ }
+
+ pt->n[0] = pt->num_ints > 0 ? atoi (num[0]) : 0;
+ pt->n[1] = pt->num_ints > 1 ? atoi (num[1]) : 0;
+ pt->n[2] = pt->num_ints > 2 ? atoi (num[2]) : 0;
+
+ pt->month = G_DATE_BAD_MONTH;
+
+ if (pt->num_ints < 3)
+ {
+ gchar lcstr[128];
+ int i = 1;
+
+ strncpy (lcstr, str, 127);
+ g_strdown (lcstr);
+
+ while (i < 13)
+ {
+ if (long_month_names[i] != NULL)
+ {
+ const gchar *found = strstr (lcstr, long_month_names[i]);
+
+ if (found != NULL)
+ {
+ pt->month = i;
+ return;
+ }
+ }
+
+ if (short_month_names[i] != NULL)
+ {
+ const gchar *found = strstr (lcstr, short_month_names[i]);
+
+ if (found != NULL)
+ {
+ pt->month = i;
+ return;
+ }
+ }
+
+ ++i;
+ }
+ }
+}
+
+static void
+g_date_prepare_to_parse (const gchar *str, GDateParseTokens *pt)
+{
+ const gchar *locale = setlocale (LC_TIME, NULL);
+ gboolean recompute_localeinfo = FALSE;
+ GDate d;
+
+ g_return_if_fail (locale != NULL); /* should not happen */
+
+ g_date_clear (&d, 1); /* clear for scratch use */
+
+ if ( (current_locale == NULL) || (strcmp (locale, current_locale) != 0) )
+ {
+ recompute_localeinfo = TRUE; /* Uh, there used to be a reason for the temporary */
+ }
+
+ if (recompute_localeinfo)
+ {
+ int i = 1;
+ GDateParseTokens testpt;
+ gchar buf[128];
+
+ g_free (current_locale); /* still works if current_locale == NULL */
+
+ current_locale = g_strdup (locale);
+
+ while (i < 13)
+ {
+ g_date_set_mdy (&d, i, 1, 1);
+
+ g_return_if_fail (g_date_valid (&d));
+
+ g_date_strftime (buf, 127, "%b", &d);
+ g_free (short_month_names[i]);
+ g_strdown (buf);
+ short_month_names[i] = g_strdup (buf);
+
+
+
+ g_date_strftime (buf, 127, "%B", &d);
+ g_free (long_month_names[i]);
+ g_strdown (buf);
+ long_month_names[i] = g_strdup (buf);
+
+ ++i;
+ }
+
+ /* Determine MDY order */
+
+ g_date_set_mdy (&d, 7, 4, 1776); /* had to pick a random day */
+
+ g_date_strftime (buf, 127, "%x", &d);
+
+ g_date_fill_parse_tokens (buf, &testpt);
+
+ i = 0;
+ while (i < testpt.num_ints)
+ {
+ switch (testpt.n[i])
+ {
+ case 7:
+ mdy_order[i] = G_DATE_MONTH;
+ break;
+ case 4:
+ mdy_order[i] = G_DATE_DAY;
+ break;
+ case 76:
+ using_twodigit_years = TRUE; /* FALL THRU */
+ case 1776:
+ mdy_order[i] = G_DATE_YEAR;
+ break;
+ default:
+ /* leave it unchanged */
+ break;
+ }
+ ++i;
+ }
+
+#ifdef G_ENABLE_DEBUG
+ g_print ("\n**GDate prepared a new set of locale-specific parse rules.\n");
+ i = 1;
+ while (i < 13)
+ {
+ g_print (" %s %s\n", long_month_names[i], short_month_names[i]);
+ ++i;
+ }
+ if (using_twodigit_years)
+ {
+ g_print ("**Using twodigit years with cutoff year: %u\n", twodigit_start_year);
+ }
+ {
+ gchar *strings[3];
+ i = 0;
+ while (i < 3)
+ {
+ switch (mdy_order[i])
+ {
+ case G_DATE_MONTH:
+ strings[i] = "Month";
+ break;
+ case G_DATE_YEAR:
+ strings[i] = "Year";
+ break;
+ case G_DATE_DAY:
+ strings[i] = "Day";
+ break;
+ default:
+ strings[i] = NULL;
+ break;
+ }
+ ++i;
+ }
+ g_print ("**Order: %s, %s, %s\n", strings[0], strings[1], strings[2]);
+ g_print ("**Sample date in this locale: `%s'\n\n", buf);
+ }
+#endif
+ }
+
+ g_date_fill_parse_tokens (str, pt);
+}
+
+void
+g_date_set_parse (GDate *d,
+ const gchar *str)
+{
+ GDateParseTokens pt;
+ guint m = G_DATE_BAD_MONTH, day = G_DATE_BAD_DAY, y = G_DATE_BAD_YEAR;
+
+ g_return_if_fail (d != NULL);
+
+ /* set invalid */
+ g_date_clear (d, 1);
+
+ g_date_prepare_to_parse (str, &pt);
+
+#ifdef G_ENABLE_DEBUG
+ g_print ("Found %d ints, `%d' `%d' `%d' and written out month %d\n",
+ pt.num_ints, pt.n[0], pt.n[1], pt.n[2], pt.month);
+#endif
+
+
+ if (pt.num_ints == 4) return; /* presumably a typo; bail out. */
+
+ if (pt.num_ints > 1)
+ {
+ int i = 0;
+ int j = 0;
+
+ g_assert (pt.num_ints < 4); /* i.e., it is 2 or 3 */
+
+ while (i < pt.num_ints && j < 3)
+ {
+ switch (mdy_order[j])
+ {
+ case G_DATE_MONTH:
+ {
+ if (pt.num_ints == 2 && pt.month != G_DATE_BAD_MONTH)
+ {
+ m = pt.month;
+ ++j; /* skip months, but don't skip this number */
+ continue;
+ }
+ else
+ m = pt.n[i];
+ }
+ break;
+ case G_DATE_DAY:
+ {
+ if (pt.num_ints == 2 && pt.month == G_DATE_BAD_MONTH)
+ {
+ day = 1;
+ ++j; /* skip days, since we may have month/year */
+ continue;
+ }
+ day = pt.n[i];
+ }
+ break;
+ case G_DATE_YEAR:
+ {
+ y = pt.n[i];
+
+ if (using_twodigit_years && y < 100)
+ {
+ guint two = twodigit_start_year % 100;
+ guint century = (twodigit_start_year / 100) * 100;
+
+ if (y < two)
+ century += 100;
+
+ y += century;
+ }
+ }
+ break;
+ default:
+ break;
+ }
+
+ ++i;
+ ++j;
+ }
+
+
+ if (pt.num_ints == 3 && !g_date_valid_mdy (m, day, y))
+ {
+ /* Try YYYY MM DD */
+ y = pt.n[0];
+ m = pt.n[1];
+ day = pt.n[2];
+
+ if (using_twodigit_years && y < 100)
+ y = G_DATE_BAD_YEAR; /* avoids ambiguity */
+ }
+ }
+ else if (pt.num_ints == 1)
+ {
+ if (pt.month != G_DATE_BAD_MONTH)
+ {
+ /* Month name and year? */
+ m = pt.month;
+ day = 1;
+ y = pt.n[0];
+ }
+ else
+ {
+ /* Try yyyymmdd and yymmdd */
+
+ m = (pt.n[0]/100) % 100;
+ day = pt.n[0] % 100;
+ y = pt.n[0]/10000;
+
+ /* FIXME move this into a separate function */
+ if (using_twodigit_years && y < 100)
+ {
+ guint two = twodigit_start_year % 100;
+ guint century = (twodigit_start_year / 100) * 100;
+
+ if (y < two)
+ century += 100;
+
+ y += century;
+ }
+ }
+ }
+
+ /* See if we got anything valid out of all this. */
+ /* y < 8000 is to catch 19998 style typos; the library is OK up to 65535 or so */
+ if (y < 8000 && g_date_valid_mdy (m, day, y))
+ {
+ d->month = m;
+ d->day = day;
+ d->year = y;
+ d->mdy = TRUE;
+ }
+#ifdef G_ENABLE_DEBUG
+ else
+ g_print ("Rejected MDY %u %u %u\n", m, day, y);
+#endif
+}
+
+void
+g_date_set_time (GDate *d, time_t t)
+{
+ struct tm *tm;
+
+ g_return_if_fail (d != NULL);
+
+ tm = localtime (&t);
+
+ if (tm)
+ {
+ d->julian = FALSE;
+
+ d->month = tm->tm_mon + 1;
+ d->day = tm->tm_mday;
+ d->year = tm->tm_year + 1900;
+
+ g_return_if_fail (g_date_valid_mdy (d->month, d->day, d->year));
+
+ d->mdy = TRUE;
+ }
+ else
+ {
+ g_date_clear (d, 1);
+ }
+}
+
+void
+g_date_set_month (GDate *d,
+ GDateMonth m)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_month (m));
+
+ d->julian = FALSE;
+
+ d->month = m;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_day (GDate *d,
+ GDateDay day)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_day (day));
+
+ d->julian = FALSE;
+
+ d->day = day;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_year (GDate *d,
+ GDateYear y)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_year (y));
+
+ d->julian = FALSE;
+
+ d->year = y;
+
+ if (g_date_valid_mdy (d->month, d->day, d->year))
+ d->mdy = TRUE;
+ else
+ d->mdy = FALSE;
+}
+
+void
+g_date_set_mdy (GDate *d,
+ GDateMonth m,
+ GDateDay day,
+ GDateYear y)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_mdy (m, day, y));
+
+ d->julian = FALSE;
+
+ d->month = m;
+ d->day = day;
+ d->year = y;
+
+ d->mdy = TRUE;
+}
+
+void
+g_date_set_julian (GDate *d, guint32 j)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid_julian (j));
+
+ d->julian_days = j;
+ d->julian = TRUE;
+ d->mdy = FALSE;
+}
+
+
+gboolean
+g_date_is_first_of_month (GDate *d)
+{
+ g_return_val_if_fail (d != NULL, FALSE);
+ g_return_val_if_fail (g_date_valid (d), FALSE);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, FALSE);
+
+ if (d->day == 1) return TRUE;
+ else return FALSE;
+}
+
+gboolean
+g_date_is_last_of_month (GDate *d)
+{
+ gint index;
+
+ g_return_val_if_fail (d != NULL, FALSE);
+ g_return_val_if_fail (g_date_valid (d), FALSE);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_val_if_fail (d->mdy, FALSE);
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day == days_in_months[index][d->month]) return TRUE;
+ else return FALSE;
+}
+
+void
+g_date_add_days (GDate *d, guint ndays)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->julian)
+ {
+ g_date_update_julian (d);
+ }
+ g_return_if_fail (d->julian);
+
+ d->julian_days += ndays;
+ d->mdy = FALSE;
+}
+
+void
+g_date_subtract_days (GDate *d, guint ndays)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->julian)
+ {
+ g_date_update_julian (d);
+ }
+ g_return_if_fail (d->julian);
+ g_return_if_fail (d->julian_days > ndays);
+
+ d->julian_days -= ndays;
+ d->mdy = FALSE;
+}
+
+void
+g_date_add_months (GDate *d,
+ guint nmonths)
+{
+ guint years, months;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ nmonths += d->month - 1;
+
+ years = nmonths/12;
+ months = nmonths%12;
+
+ d->month = months + 1;
+ d->year += years;
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day > days_in_months[index][d->month])
+ d->day = days_in_months[index][d->month];
+
+ d->julian = FALSE;
+
+ g_return_if_fail (g_date_valid (d));
+}
+
+void
+g_date_subtract_months (GDate *d,
+ guint nmonths)
+{
+ guint years, months;
+ gint index;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ years = nmonths/12;
+ months = nmonths%12;
+
+ g_return_if_fail (d->year > years);
+
+ d->year -= years;
+
+ if (d->month > months) d->month -= months;
+ else
+ {
+ months -= d->month;
+ d->month = 12 - months;
+ d->year -= 1;
+ }
+
+ index = g_date_is_leap_year (d->year) ? 1 : 0;
+
+ if (d->day > days_in_months[index][d->month])
+ d->day = days_in_months[index][d->month];
+
+ d->julian = FALSE;
+
+ g_return_if_fail (g_date_valid (d));
+}
+
+void
+g_date_add_years (GDate *d,
+ guint nyears)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ d->year += nyears;
+
+ if (d->month == 2 && d->day == 29)
+ {
+ if (!g_date_is_leap_year (d->year))
+ {
+ d->day = 28;
+ }
+ }
+
+ d->julian = FALSE;
+}
+
+void
+g_date_subtract_years (GDate *d,
+ guint nyears)
+{
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+ g_return_if_fail (d->year > nyears);
+
+ d->year -= nyears;
+
+ if (d->month == 2 && d->day == 29)
+ {
+ if (!g_date_is_leap_year (d->year))
+ {
+ d->day = 28;
+ }
+ }
+
+ d->julian = FALSE;
+}
+
+
+gboolean
+g_date_is_leap_year (GDateYear year)
+{
+ g_return_val_if_fail (g_date_valid_year (year), FALSE);
+
+ return ( (((year % 4) == 0) && ((year % 100) != 0)) ||
+ (year % 400) == 0 );
+}
+
+guint8
+g_date_days_in_month (GDateMonth month,
+ GDateYear year)
+{
+ gint index;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+ g_return_val_if_fail (g_date_valid_month (month), 0);
+
+ index = g_date_is_leap_year (year) ? 1 : 0;
+
+ return days_in_months[index][month];
+}
+
+guint8
+g_date_monday_weeks_in_year (GDateYear year)
+{
+ GDate d;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+
+ g_date_clear (&d, 1);
+ g_date_set_mdy (&d, 1, 1, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ g_date_set_mdy (&d, 12, 31, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ if (g_date_is_leap_year (year))
+ {
+ g_date_set_mdy (&d, 1, 2, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ g_date_set_mdy (&d, 12, 30, year);
+ if (g_date_weekday (&d) == G_DATE_MONDAY) return 53;
+ }
+ return 52;
+}
+
+guint8
+g_date_sunday_weeks_in_year (GDateYear year)
+{
+ GDate d;
+
+ g_return_val_if_fail (g_date_valid_year (year), 0);
+
+ g_date_clear (&d, 1);
+ g_date_set_mdy (&d, 1, 1, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ g_date_set_mdy (&d, 12, 31, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ if (g_date_is_leap_year (year))
+ {
+ g_date_set_mdy (&d, 1, 2, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ g_date_set_mdy (&d, 12, 30, year);
+ if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53;
+ }
+ return 52;
+}
+
+gint
+g_date_compare (GDate *lhs,
+ GDate *rhs)
+{
+ g_return_val_if_fail (lhs != NULL, 0);
+ g_return_val_if_fail (rhs != NULL, 0);
+ g_return_val_if_fail (g_date_valid (lhs), 0);
+ g_return_val_if_fail (g_date_valid (rhs), 0);
+
+ /* Remember the self-comparison case! I think it works right now. */
+
+ while (TRUE)
+ {
+
+ if (lhs->julian && rhs->julian)
+ {
+ if (lhs->julian_days < rhs->julian_days) return -1;
+ else if (lhs->julian_days > rhs->julian_days) return 1;
+ else return 0;
+ }
+ else if (lhs->mdy && rhs->mdy)
+ {
+ if (lhs->year < rhs->year) return -1;
+ else if (lhs->year > rhs->year) return 1;
+ else
+ {
+ if (lhs->month < rhs->month) return -1;
+ else if (lhs->month > rhs->month) return 1;
+ else
+ {
+ if (lhs->day < rhs->day) return -1;
+ else if (lhs->day > rhs->day) return 1;
+ else return 0;
+ }
+
+ }
+
+ }
+ else
+ {
+ if (!lhs->julian) g_date_update_julian (lhs);
+ if (!rhs->julian) g_date_update_julian (rhs);
+ g_return_val_if_fail (lhs->julian, 0);
+ g_return_val_if_fail (rhs->julian, 0);
+ }
+
+ }
+ return 0; /* warnings */
+}
+
+
+void
+g_date_to_struct_tm (GDate *d,
+ struct tm *tm)
+{
+ GDateWeekday day;
+
+ g_return_if_fail (d != NULL);
+ g_return_if_fail (g_date_valid (d));
+ g_return_if_fail (tm != NULL);
+
+ if (!d->mdy)
+ {
+ g_date_update_mdy (d);
+ }
+ g_return_if_fail (d->mdy);
+
+ /* zero all the irrelevant fields to be sure they're valid */
+
+ /* On Linux and maybe other systems, there are weird non-POSIX
+ * fields on the end of struct tm that choke strftime if they
+ * contain garbage. So we need to 0 the entire struct, not just the
+ * fields we know to exist.
+ */
+
+ memset (tm, 0x0, sizeof (struct tm));
+
+ tm->tm_mday = d->day;
+ tm->tm_mon = d->month - 1; /* 0-11 goes in tm */
+ tm->tm_year = ((int)d->year) - 1900; /* X/Open says tm_year can be negative */
+
+ day = g_date_weekday (d);
+ if (day == 7) day = 0; /* struct tm wants days since Sunday, so Sunday is 0 */
+
+ tm->tm_wday = (int)day;
+
+ tm->tm_yday = g_date_day_of_year (d) - 1; /* 0 to 365 */
+ tm->tm_isdst = -1; /* -1 means "information not available" */
+}
+
+gsize
+g_date_strftime (gchar *s,
+ gsize slen,
+ const gchar *format,
+ GDate *d)
+{
+ struct tm tm;
+ gsize retval;
+
+ g_return_val_if_fail (d != NULL, 0);
+ g_return_val_if_fail (g_date_valid (d), 0);
+ g_return_val_if_fail (slen > 0, 0);
+ g_return_val_if_fail (format != 0, 0);
+ g_return_val_if_fail (s != 0, 0);
+
+ g_date_to_struct_tm (d, &tm);
+
+ retval = strftime (s, slen, format, &tm);
+ if (retval == 0)
+ {
+ /* If retval == 0, the contents of s are undefined. We define
+ * them.
+ */
+ s[0] = '\0';
+ }
+ return retval;
+}
void g_completion_free (GCompletion* cmp);
+
+
+/* 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>
+ */
+
+#include <time.h>
+
+/* this enum is used to specify order of appearance in parsed date
+ * strings
+ */
+
+typedef enum {
+ G_DATE_MONTH = 0,
+ G_DATE_DAY = 1,
+ G_DATE_YEAR = 2
+} GDateMDY;
+
+/* These other types specify the actual 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;
+
+typedef guint16 GDateYear;
+typedef guint8 GDateDay; /* day of the month */
+
+#define G_DATE_BAD_JULIAN 0U
+#define G_DATE_BAD_DAY 0U
+#define G_DATE_BAD_YEAR 0U
+
+typedef struct _GDate GDate;
+
+/* 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 mdy : 1; /* mdy is valid */
+
+ /* MDY representation */
+ guint month : 4;
+ guint day : 6;
+ guint year : 16;
+};
+
+/* _new with no args 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_mdy (GDateMonth m,
+ GDateDay d,
+ GDateYear y);
+GDate* g_date_new_julian (guint32 julian_day);
+void g_date_free (GDate *d);
+
+/* 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 *d);
+gboolean g_date_valid_month (GDateMonth m);
+gboolean g_date_valid_year (GDateYear y);
+gboolean g_date_valid_day (GDateDay d);
+gboolean g_date_valid_weekday (GDateWeekday w);
+gboolean g_date_valid_julian (guint32 j);
+gboolean g_date_valid_mdy (GDateMonth m,
+ GDateDay d,
+ GDateYear y);
+
+GDateWeekday g_date_weekday (GDate *d);
+GDateMonth g_date_month (GDate *d);
+GDateYear g_date_year (GDate *d);
+GDateDay g_date_day (GDate *d);
+guint32 g_date_julian (GDate *d);
+
+guint g_date_day_of_year (GDate *d);
+
+/* 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 should be added.
+ */
+
+guint g_date_monday_week_of_year (GDate *d); /* # weeks, starting on Monday */
+guint g_date_sunday_week_of_year (GDate *d); /* # weeks, starting on Sunday */
+
+/* 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 *d,
+ guint ndates);
+
+/* 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 *d,
+ const gchar *str);
+
+void g_date_set_time (GDate *d,
+ time_t t);
+
+void g_date_set_month (GDate *d,
+ GDateMonth m);
+void g_date_set_day (GDate *d,
+ GDateDay day);
+void g_date_set_year (GDate *d,
+ GDateYear y);
+void g_date_set_mdy (GDate *d,
+ GDateMonth m,
+ GDateDay day,
+ GDateYear y);
+
+void g_date_set_julian (GDate *d,
+ guint32 j);
+
+gboolean g_date_is_first_of_month (GDate *d);
+gboolean g_date_is_last_of_month (GDate *d);
+
+
+/* To go forward by some number of weeks just go forward weeks*7 days */
+void g_date_add_days (GDate *d,
+ guint ndays);
+void g_date_subtract_days (GDate *d,
+ guint ndays);
+
+/* If you add/sub months while day > 28, the day might change */
+void g_date_add_months (GDate *d,
+ guint nmonths);
+void g_date_subtract_months (GDate *d,
+ guint nmonths);
+
+/* If it's feb 29, changing years can move you to the 28th */
+void g_date_add_years (GDate *d,
+ guint nyears);
+void g_date_subtract_years (GDate *d,
+ guint nyears);
+
+gboolean g_date_is_leap_year (GDateYear year);
+guint8 g_date_days_in_month (GDateMonth month,
+ GDateYear year);
+guint8 g_date_monday_weeks_in_year (GDateYear year);
+guint8 g_date_sunday_weeks_in_year (GDateYear year);
+
+/* qsort-friendly (with a cast...) */
+gint g_date_compare (GDate *lhs,
+ GDate *rhs);
+
+
+void g_date_to_struct_tm (GDate *d,
+ 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 *d);
+
+
+
+
/* GRelation: Indexed Relations. Imagine a really simple table in a
* database. Relations are not ordered. This data type is meant for
* maintaining a N-way mapping.
projects / platform / upstream / glib.git / commitdiff