| /* 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. |
| */ |
| |
| /* |
| * MT safe |
| */ |
| |
| #include "glib.h" |
| |
| #include <time.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_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; |
| } |
| |
| 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; |
| } |
| |
| 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); |
| |
| 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 } |
| }; |
| |
| 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_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 (GDate *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 (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->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; |
| } |
| |
| 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_val_if_fail (d->dmy, 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_val_if_fail (d->dmy, 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_val_if_fail (d->dmy, 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->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); |
| } |
| |
| 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->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_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->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_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)); |
| } |
| |
| G_LOCK_DECLARE_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 |
| }; |
| |
| /* 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 |
| |
| /* HOLDS: g_date_global_lock */ |
| 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; |
| } |
| } |
| } |
| |
| /* HOLDS: g_date_global_lock */ |
| 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_dmy (&d, 1, i, 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 DMY order */ |
| |
| /* had to pick a random day - don't change this, some strftimes |
| * are broken on some days, and this one is good so far. */ |
| g_date_set_dmy (&d, 4, 7, 1976); |
| |
| 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: |
| dmy_order[i] = G_DATE_MONTH; |
| break; |
| case 4: |
| dmy_order[i] = G_DATE_DAY; |
| break; |
| case 76: |
| using_twodigit_years = TRUE; /* FALL THRU */ |
| case 1976: |
| dmy_order[i] = G_DATE_YEAR; |
| break; |
| default: |
| /* leave it unchanged */ |
| break; |
| } |
| ++i; |
| } |
| |
| #ifdef G_ENABLE_DEBUG |
| g_message ("**GDate prepared a new set of locale-specific parse rules."); |
| i = 1; |
| while (i < 13) |
| { |
| g_message (" %s %s", long_month_names[i], short_month_names[i]); |
| ++i; |
| } |
| if (using_twodigit_years) |
| { |
| g_message ("**Using twodigit years with cutoff year: %u", twodigit_start_year); |
| } |
| { |
| gchar *strings[3]; |
| i = 0; |
| while (i < 3) |
| { |
| switch (dmy_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_message ("**Order: %s, %s, %s", strings[0], strings[1], strings[2]); |
| g_message ("**Sample date in this locale: `%s'", 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_LOCK (g_date_global); |
| |
| g_date_prepare_to_parse (str, &pt); |
| |
| #ifdef G_ENABLE_DEBUG |
| g_message ("Found %d ints, `%d' `%d' `%d' and written out month %d", |
| pt.num_ints, pt.n[0], pt.n[1], pt.n[2], pt.month); |
| #endif |
| |
| |
| if (pt.num_ints == 4) |
| { |
| G_UNLOCK (g_date_global); |
| 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 (dmy_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_dmy (day, m, 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_dmy (day, m, y)) |
| { |
| d->month = m; |
| d->day = day; |
| d->year = y; |
| d->dmy = TRUE; |
| } |
| #ifdef G_ENABLE_DEBUG |
| else |
| g_message ("Rejected DMY %u %u %u", day, m, y); |
| #endif |
| G_UNLOCK (g_date_global); |
| } |
| |
| void |
| g_date_set_time (GDate *d, |
| GTime time) |
| { |
| time_t t = time; |
| 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_dmy (d->day, d->month, d->year)); |
| |
| d->dmy = 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)); |
| |
| if (d->julian && !d->dmy) g_date_update_dmy(d); |
| d->julian = FALSE; |
| |
| d->month = m; |
| |
| if (g_date_valid_dmy (d->day, d->month, d->year)) |
| d->dmy = TRUE; |
| else |
| d->dmy = 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)); |
| |
| if (d->julian && !d->dmy) g_date_update_dmy(d); |
| d->julian = FALSE; |
| |
| d->day = day; |
| |
| if (g_date_valid_dmy (d->day, d->month, d->year)) |
| d->dmy = TRUE; |
| else |
| d->dmy = 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)); |
| |
| if (d->julian && !d->dmy) g_date_update_dmy(d); |
| d->julian = FALSE; |
| |
| d->year = y; |
| |
| if (g_date_valid_dmy (d->day, d->month, d->year)) |
| d->dmy = TRUE; |
| else |
| d->dmy = FALSE; |
| } |
| |
| void |
| g_date_set_dmy (GDate *d, |
| GDateDay day, |
| GDateMonth m, |
| GDateYear y) |
| { |
| g_return_if_fail (d != NULL); |
| g_return_if_fail (g_date_valid_dmy (day, m, y)); |
| |
| d->julian = FALSE; |
| |
| d->month = m; |
| d->day = day; |
| d->year = y; |
| |
| d->dmy = 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->dmy = 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_val_if_fail (d->dmy, 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_val_if_fail (d->dmy, 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->dmy = 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->dmy = 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_if_fail (d->dmy); |
| |
| 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_if_fail (d->dmy); |
| |
| 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_if_fail (d->dmy); |
| |
| 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_if_fail (d->dmy); |
| 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_dmy (&d, 1, 1, year); |
| if (g_date_weekday (&d) == G_DATE_MONDAY) return 53; |
| g_date_set_dmy (&d, 31, 12, year); |
| if (g_date_weekday (&d) == G_DATE_MONDAY) return 53; |
| if (g_date_is_leap_year (year)) |
| { |
| g_date_set_dmy (&d, 2, 1, year); |
| if (g_date_weekday (&d) == G_DATE_MONDAY) return 53; |
| g_date_set_dmy (&d, 30, 12, 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_dmy (&d, 1, 1, year); |
| if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53; |
| g_date_set_dmy (&d, 31, 12, year); |
| if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53; |
| if (g_date_is_leap_year (year)) |
| { |
| g_date_set_dmy (&d, 2, 1, year); |
| if (g_date_weekday (&d) == G_DATE_SUNDAY) return 53; |
| g_date_set_dmy (&d, 30, 12, 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->dmy && rhs->dmy) |
| { |
| 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->dmy) |
| { |
| g_date_update_dmy (d); |
| } |
| g_return_if_fail (d->dmy); |
| |
| /* 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; |
| } |
