/* GLIB - Library of useful routines for C programming * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place - Suite 330, * Boston, MA 02111-1307, USA. */ /* * Modified by the GLib Team and others 1997-2000. See the AUTHORS * file for a list of people on the GLib Team. See the ChangeLog * files for a list of changes. These files are distributed with * GLib at ftp://ftp.gtk.org/pub/gtk/. */ /* * MT safe */ #include "config.h" #include "glibconfig.h" #define DEBUG_MSG(x) /* */ #ifdef G_ENABLE_DEBUG /* #define DEBUG_MSG(args) g_message args ; */ #endif #include #include #include #include #ifdef G_OS_WIN32 #include #endif #include "gdate.h" #include "gconvert.h" #include "gmem.h" #include "gstrfuncs.h" #include "gtestutils.h" #include "gthread.h" #include "gunicode.h" #ifdef G_OS_WIN32 #include "garray.h" #endif GDate* g_date_new (void) { 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 (const GDate *d) { g_return_val_if_fail (d != NULL, FALSE); return (d->julian || d->dmy); } static const guint8 days_in_months[2][13] = { /* error, jan feb mar apr may jun jul aug sep oct nov dec */ { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 }, { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } /* leap year */ }; static const guint16 days_in_year[2][14] = { /* 0, jan feb mar apr may jun jul aug sep oct nov dec */ { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 }, { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 } }; 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 (const GDate *const_d) { GDate *d = (GDate *) const_d; GDateYear year; gint idx; 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 */ idx = g_date_is_leap_year (d->year) ? 1 : 0; d->julian_days += days_in_year[idx][d->month] + d->day; g_return_if_fail (g_date_valid_julian (d->julian_days)); d->julian = TRUE; } static void g_date_update_dmy (const GDate *const_d) { GDate *d = (GDate *) const_d; GDateYear y; GDateMonth m; GDateDay day; guint32 A, B, C, D, E, M; g_return_if_fail (d != NULL); g_return_if_fail (d->julian); g_return_if_fail (!d->dmy); g_return_if_fail (g_date_valid_julian (d->julian_days)); /* Formula taken from the Calendar FAQ; the formula was for the * Julian Period which starts on 1 January 4713 BC, so we add * 1,721,425 to the number of days before doing the formula. * * I'm sure this can be simplified for our 1 January 1 AD period * start, but I can't figure out how to unpack the formula. */ A = d->julian_days + 1721425 + 32045; B = ( 4 *(A + 36524) )/ 146097 - 1; C = A - (146097 * B)/4; D = ( 4 * (C + 365) ) / 1461 - 1; E = C - ((1461*D) / 4); M = (5 * (E - 1) + 2)/153; m = M + 3 - (12*(M/10)); day = E - (153*M + 2)/5; y = 100 * B + D - 4800 + (M/10); #ifdef G_ENABLE_DEBUG if (!g_date_valid_dmy (day, m, y)) g_warning ("\nOOPS julian: %u computed dmy: %u %u %u\n", d->julian_days, day, m, y); #endif d->month = m; d->day = day; d->year = y; d->dmy = TRUE; } GDateWeekday g_date_get_weekday (const GDate *d) { g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_WEEKDAY); if (!d->julian) g_date_update_julian (d); g_return_val_if_fail (d->julian, G_DATE_BAD_WEEKDAY); return ((d->julian_days - 1) % 7) + 1; } GDateMonth g_date_get_month (const GDate *d) { g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH); if (!d->dmy) g_date_update_dmy (d); g_return_val_if_fail (d->dmy, G_DATE_BAD_MONTH); return d->month; } GDateYear g_date_get_year (const GDate *d) { g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR); if (!d->dmy) g_date_update_dmy (d); g_return_val_if_fail (d->dmy, G_DATE_BAD_YEAR); return d->year; } GDateDay g_date_get_day (const GDate *d) { g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY); if (!d->dmy) g_date_update_dmy (d); g_return_val_if_fail (d->dmy, G_DATE_BAD_DAY); return d->day; } guint32 g_date_get_julian (const GDate *d) { g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_JULIAN); if (!d->julian) g_date_update_julian (d); g_return_val_if_fail (d->julian, G_DATE_BAD_JULIAN); return d->julian_days; } guint g_date_get_day_of_year (const GDate *d) { gint idx; 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); idx = g_date_is_leap_year (d->year) ? 1 : 0; return (days_in_year[idx][d->month] + d->day); } guint g_date_get_monday_week_of_year (const GDate *d) { GDateWeekday wd; guint day; GDate first; g_return_val_if_fail (g_date_valid (d), 0); if (!d->dmy) g_date_update_dmy (d); g_return_val_if_fail (d->dmy, 0); g_date_clear (&first, 1); g_date_set_dmy (&first, 1, 1, d->year); wd = g_date_get_weekday (&first) - 1; /* make Monday day 0 */ day = g_date_get_day_of_year (d) - 1; return ((day + wd)/7U + (wd == 0 ? 1 : 0)); } guint g_date_get_sunday_week_of_year (const GDate *d) { GDateWeekday wd; guint day; GDate first; g_return_val_if_fail (g_date_valid (d), 0); if (!d->dmy) g_date_update_dmy (d); g_return_val_if_fail (d->dmy, 0); g_date_clear (&first, 1); g_date_set_dmy (&first, 1, 1, d->year); wd = g_date_get_weekday (&first); if (wd == 7) wd = 0; /* make Sunday day 0 */ day = g_date_get_day_of_year (d) - 1; return ((day + wd)/7U + (wd == 0 ? 1 : 0)); } /** * g_date_get_iso8601_week_of_year: * @date: a valid #GDate * * Returns the week of the year, where weeks are interpreted according * to ISO 8601. * * Returns: ISO 8601 week number of the year. * * Since: 2.6 **/ guint g_date_get_iso8601_week_of_year (const GDate *d) { guint j, d4, L, d1, w; g_return_val_if_fail (g_date_valid (d), 0); if (!d->julian) g_date_update_julian (d); g_return_val_if_fail (d->julian, 0); /* Formula taken from the Calendar FAQ; the formula was for the * Julian Period which starts on 1 January 4713 BC, so we add * 1,721,425 to the number of days before doing the formula. */ j = d->julian_days + 1721425; d4 = (j + 31741 - (j % 7)) % 146097 % 36524 % 1461; L = d4 / 1460; d1 = ((d4 - L) % 365) + L; w = d1 / 7 + 1; return w; } gint g_date_days_between (const GDate *d1, const GDate *d2) { g_return_val_if_fail (g_date_valid (d1), 0); g_return_val_if_fail (g_date_valid (d2), 0); return (gint)g_date_get_julian (d2) - (gint)g_date_get_julian (d1); } 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_DEFINE_STATIC (g_date_global); /* These are for the parser, output to the user should use * * g_date_strftime () - this creates more never-freed memory to annoy * all those memory debugger users. :-) */ static gchar *long_month_names[13] = { NULL, }; static gchar *short_month_names[13] = { 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 const 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; /* Adjustment of locale era to AD, non-zero means using locale era */ static gint locale_era_adjust = 0; 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 guchar *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 = (const guchar *) str; pt->num_ints = 0; while (*s && pt->num_ints < 4) { i = 0; while (*s && g_ascii_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 *casefold; gchar *normalized; casefold = g_utf8_casefold (str, -1); normalized = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL); g_free (casefold); i = 1; while (i < 13) { if (long_month_names[i] != NULL) { const gchar *found = strstr (normalized, long_month_names[i]); if (found != NULL) { pt->month = i; break; } } if (short_month_names[i] != NULL) { const gchar *found = strstr (normalized, short_month_names[i]); if (found != NULL) { pt->month = i; break; } } ++i; } g_free (normalized); } } /* 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); short_month_names[0] = "Error"; long_month_names[0] = "Error"; while (i < 13) { gchar *casefold; g_date_set_dmy (&d, 1, i, 1); g_return_if_fail (g_date_valid (&d)); g_date_strftime (buf, 127, "%b", &d); casefold = g_utf8_casefold (buf, -1); g_free (short_month_names[i]); short_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL); g_free (casefold); g_date_strftime (buf, 127, "%B", &d); casefold = g_utf8_casefold (buf, -1); g_free (long_month_names[i]); long_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL); g_free (casefold); ++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: /* assume locale era */ locale_era_adjust = 1976 - testpt.n[i]; dmy_order[i] = G_DATE_YEAR; break; } ++i; } #ifdef G_ENABLE_DEBUG DEBUG_MSG (("**GDate prepared a new set of locale-specific parse rules.")); i = 1; while (i < 13) { DEBUG_MSG ((" %s %s", long_month_names[i], short_month_names[i])); ++i; } if (using_twodigit_years) { DEBUG_MSG (("**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; } DEBUG_MSG (("**Order: %s, %s, %s", strings[0], strings[1], strings[2])); DEBUG_MSG (("**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); DEBUG_MSG (("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)); 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 (locale_era_adjust != 0) { y += locale_era_adjust; } else 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 == 2) { if (m == G_DATE_BAD_MONTH && pt.month != G_DATE_BAD_MONTH) m = pt.month; } } 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 { DEBUG_MSG (("Rejected DMY %u %u %u", day, m, y)); } #endif G_UNLOCK (g_date_global); } /** * g_date_set_time_t: * @date: a #GDate * @timet: time_t value to set * * Sets the value of a date to the date corresponding to a time * specified as a time_t. The time to date conversion is done using * the user's current timezone. * * To set the value of a date to the current day, you could write: * |[ * g_date_set_time_t (date, time (NULL)); * ]| * * Since: 2.10 */ void g_date_set_time_t (GDate *date, time_t timet) { struct tm tm; g_return_if_fail (date != NULL); #ifdef HAVE_LOCALTIME_R localtime_r (&timet, &tm); #else { struct tm *ptm = localtime (&timet); if (ptm == NULL) { /* Happens at least in Microsoft's C library if you pass a * negative time_t. Use 2000-01-01 as default date. */ #ifndef G_DISABLE_CHECKS g_return_if_fail_warning (G_LOG_DOMAIN, "g_date_set_time", "ptm != NULL"); #endif tm.tm_mon = 0; tm.tm_mday = 1; tm.tm_year = 100; } else memcpy ((void *) &tm, (void *) ptm, sizeof(struct tm)); } #endif date->julian = FALSE; date->month = tm.tm_mon + 1; date->day = tm.tm_mday; date->year = tm.tm_year + 1900; g_return_if_fail (g_date_valid_dmy (date->day, date->month, date->year)); date->dmy = TRUE; } /** * g_date_set_time: * @date: a #GDate. * @time_: #GTime value to set. * * Sets the value of a date from a #GTime value. * The time to date conversion is done using the user's current timezone. * * Deprecated: 2.10: Use g_date_set_time_t() instead. */ void g_date_set_time (GDate *date, GTime time_) { g_date_set_time_t (date, (time_t) time_); } /** * g_date_set_time_val: * @date: a #GDate * @timeval: #GTimeVal value to set * * Sets the value of a date from a #GTimeVal value. Note that the * @tv_usec member is ignored, because #GDate can't make use of the * additional precision. * * The time to date conversion is done using the user's current timezone. * * Since: 2.10 */ void g_date_set_time_val (GDate *date, GTimeVal *timeval) { g_date_set_time_t (date, (time_t) timeval->tv_sec); } 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 (const GDate *d) { 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 (const GDate *d) { gint idx; 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); idx = g_date_is_leap_year (d->year) ? 1 : 0; if (d->day == days_in_months[idx][d->month]) return TRUE; else return FALSE; } void g_date_add_days (GDate *d, guint ndays) { 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 (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 idx; 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; idx = g_date_is_leap_year (d->year) ? 1 : 0; if (d->day > days_in_months[idx][d->month]) d->day = days_in_months[idx][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 idx; 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; } idx = g_date_is_leap_year (d->year) ? 1 : 0; if (d->day > days_in_months[idx][d->month]) d->day = days_in_months[idx][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 (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 (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_get_days_in_month (GDateMonth month, GDateYear year) { gint idx; g_return_val_if_fail (g_date_valid_year (year), 0); g_return_val_if_fail (g_date_valid_month (month), 0); idx = g_date_is_leap_year (year) ? 1 : 0; return days_in_months[idx][month]; } guint8 g_date_get_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_get_weekday (&d) == G_DATE_MONDAY) return 53; g_date_set_dmy (&d, 31, 12, year); if (g_date_get_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_get_weekday (&d) == G_DATE_MONDAY) return 53; g_date_set_dmy (&d, 30, 12, year); if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53; } return 52; } guint8 g_date_get_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_get_weekday (&d) == G_DATE_SUNDAY) return 53; g_date_set_dmy (&d, 31, 12, year); if (g_date_get_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_get_weekday (&d) == G_DATE_SUNDAY) return 53; g_date_set_dmy (&d, 30, 12, year); if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53; } return 52; } gint g_date_compare (const GDate *lhs, const 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 (const GDate *d, struct tm *tm) { GDateWeekday day; 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_get_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_get_day_of_year (d) - 1; /* 0 to 365 */ tm->tm_isdst = -1; /* -1 means "information not available" */ } void g_date_clamp (GDate *date, const GDate *min_date, const GDate *max_date) { g_return_if_fail (g_date_valid (date)); if (min_date != NULL) g_return_if_fail (g_date_valid (min_date)); if (max_date != NULL) g_return_if_fail (g_date_valid (max_date)); if (min_date != NULL && max_date != NULL) g_return_if_fail (g_date_compare (min_date, max_date) <= 0); if (min_date && g_date_compare (date, min_date) < 0) *date = *min_date; if (max_date && g_date_compare (max_date, date) < 0) *date = *max_date; } void g_date_order (GDate *date1, GDate *date2) { g_return_if_fail (g_date_valid (date1)); g_return_if_fail (g_date_valid (date2)); if (g_date_compare (date1, date2) > 0) { GDate tmp = *date1; *date1 = *date2; *date2 = tmp; } } #ifdef G_OS_WIN32 static gsize win32_strftime_helper (const GDate *d, const gchar *format, const struct tm *tm, gchar *s, gsize slen) { SYSTEMTIME systemtime; TIME_ZONE_INFORMATION tzinfo; LCID lcid; int n, k; GArray *result; const gchar *p; gunichar c; const wchar_t digits[] = L"0123456789"; gchar *convbuf; glong convlen = 0; gsize retval; systemtime.wYear = tm->tm_year + 1900; systemtime.wMonth = tm->tm_mon + 1; systemtime.wDayOfWeek = tm->tm_wday; systemtime.wDay = tm->tm_mday; systemtime.wHour = tm->tm_hour; systemtime.wMinute = tm->tm_min; systemtime.wSecond = tm->tm_sec; systemtime.wMilliseconds = 0; lcid = GetThreadLocale (); result = g_array_sized_new (FALSE, FALSE, sizeof (wchar_t), MAX (128, strlen (format) * 2)); p = format; while (*p) { c = g_utf8_get_char (p); if (c == '%') { p = g_utf8_next_char (p); if (!*p) { s[0] = '\0'; g_array_free (result, TRUE); return 0; } c = g_utf8_get_char (p); if (c == 'E' || c == 'O') { /* Ignore modified conversion specifiers for now. */ p = g_utf8_next_char (p); if (!*p) { s[0] = '\0'; g_array_free (result, TRUE); return 0; } c = g_utf8_get_char (p); } switch (c) { case 'a': if (systemtime.wDayOfWeek == 0) k = 6; else k = systemtime.wDayOfWeek - 1; n = GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, NULL, 0); g_array_set_size (result, result->len + n); GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); break; case 'A': if (systemtime.wDayOfWeek == 0) k = 6; else k = systemtime.wDayOfWeek - 1; n = GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, NULL, 0); g_array_set_size (result, result->len + n); GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); break; case 'b': case 'h': n = GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, NULL, 0); g_array_set_size (result, result->len + n); GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); break; case 'B': n = GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, NULL, 0); g_array_set_size (result, result->len + n); GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); break; case 'c': n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } g_array_append_vals (result, L" ", 1); n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } break; case 'C': g_array_append_vals (result, digits + systemtime.wYear/1000, 1); g_array_append_vals (result, digits + (systemtime.wYear/1000)%10, 1); break; case 'd': g_array_append_vals (result, digits + systemtime.wDay/10, 1); g_array_append_vals (result, digits + systemtime.wDay%10, 1); break; case 'D': g_array_append_vals (result, digits + systemtime.wMonth/10, 1); g_array_append_vals (result, digits + systemtime.wMonth%10, 1); g_array_append_vals (result, L"/", 1); g_array_append_vals (result, digits + systemtime.wDay/10, 1); g_array_append_vals (result, digits + systemtime.wDay%10, 1); g_array_append_vals (result, L"/", 1); g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1); g_array_append_vals (result, digits + systemtime.wYear%10, 1); break; case 'e': if (systemtime.wDay >= 10) g_array_append_vals (result, digits + systemtime.wDay/10, 1); else g_array_append_vals (result, L" ", 1); g_array_append_vals (result, digits + systemtime.wDay%10, 1); break; /* A GDate has no time fields, so for now we can * hardcode all time conversions into zeros (or 12 for * %I). The alternative code snippets in the #else * branches are here ready to be taken into use when * needed by a g_strftime() or g_date_and_time_format() * or whatever. */ case 'H': #if 1 g_array_append_vals (result, L"00", 2); #else g_array_append_vals (result, digits + systemtime.wHour/10, 1); g_array_append_vals (result, digits + systemtime.wHour%10, 1); #endif break; case 'I': #if 1 g_array_append_vals (result, L"12", 2); #else if (systemtime.wHour == 0) g_array_append_vals (result, L"12", 2); else { g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1); g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1); } #endif break; case 'j': g_array_append_vals (result, digits + (tm->tm_yday+1)/100, 1); g_array_append_vals (result, digits + ((tm->tm_yday+1)/10)%10, 1); g_array_append_vals (result, digits + (tm->tm_yday+1)%10, 1); break; case 'm': g_array_append_vals (result, digits + systemtime.wMonth/10, 1); g_array_append_vals (result, digits + systemtime.wMonth%10, 1); break; case 'M': #if 1 g_array_append_vals (result, L"00", 2); #else g_array_append_vals (result, digits + systemtime.wMinute/10, 1); g_array_append_vals (result, digits + systemtime.wMinute%10, 1); #endif break; case 'n': g_array_append_vals (result, L"\n", 1); break; case 'p': n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } break; case 'r': /* This is a rather odd format. Hard to say what to do. * Let's always use the POSIX %I:%M:%S %p */ #if 1 g_array_append_vals (result, L"12:00:00", 8); #else if (systemtime.wHour == 0) g_array_append_vals (result, L"12", 2); else { g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1); g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1); } g_array_append_vals (result, L":", 1); g_array_append_vals (result, digits + systemtime.wMinute/10, 1); g_array_append_vals (result, digits + systemtime.wMinute%10, 1); g_array_append_vals (result, L":", 1); g_array_append_vals (result, digits + systemtime.wSecond/10, 1); g_array_append_vals (result, digits + systemtime.wSecond%10, 1); g_array_append_vals (result, L" ", 1); #endif n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } break; case 'R': #if 1 g_array_append_vals (result, L"00:00", 5); #else g_array_append_vals (result, digits + systemtime.wHour/10, 1); g_array_append_vals (result, digits + systemtime.wHour%10, 1); g_array_append_vals (result, L":", 1); g_array_append_vals (result, digits + systemtime.wMinute/10, 1); g_array_append_vals (result, digits + systemtime.wMinute%10, 1); #endif break; case 'S': #if 1 g_array_append_vals (result, L"00", 2); #else g_array_append_vals (result, digits + systemtime.wSecond/10, 1); g_array_append_vals (result, digits + systemtime.wSecond%10, 1); #endif break; case 't': g_array_append_vals (result, L"\t", 1); break; case 'T': #if 1 g_array_append_vals (result, L"00:00:00", 8); #else g_array_append_vals (result, digits + systemtime.wHour/10, 1); g_array_append_vals (result, digits + systemtime.wHour%10, 1); g_array_append_vals (result, L":", 1); g_array_append_vals (result, digits + systemtime.wMinute/10, 1); g_array_append_vals (result, digits + systemtime.wMinute%10, 1); g_array_append_vals (result, L":", 1); g_array_append_vals (result, digits + systemtime.wSecond/10, 1); g_array_append_vals (result, digits + systemtime.wSecond%10, 1); #endif break; case 'u': if (systemtime.wDayOfWeek == 0) g_array_append_vals (result, L"7", 1); else g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1); break; case 'U': n = g_date_get_sunday_week_of_year (d); g_array_append_vals (result, digits + n/10, 1); g_array_append_vals (result, digits + n%10, 1); break; case 'V': n = g_date_get_iso8601_week_of_year (d); g_array_append_vals (result, digits + n/10, 1); g_array_append_vals (result, digits + n%10, 1); break; case 'w': g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1); break; case 'W': n = g_date_get_monday_week_of_year (d); g_array_append_vals (result, digits + n/10, 1); g_array_append_vals (result, digits + n%10, 1); break; case 'x': n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } break; case 'X': n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0); if (n > 0) { g_array_set_size (result, result->len + n); GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n); g_array_set_size (result, result->len - 1); } break; case 'y': g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1); g_array_append_vals (result, digits + systemtime.wYear%10, 1); break; case 'Y': g_array_append_vals (result, digits + systemtime.wYear/1000, 1); g_array_append_vals (result, digits + (systemtime.wYear/100)%10, 1); g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1); g_array_append_vals (result, digits + systemtime.wYear%10, 1); break; case 'Z': n = GetTimeZoneInformation (&tzinfo); if (n == TIME_ZONE_ID_UNKNOWN) ; else if (n == TIME_ZONE_ID_STANDARD) g_array_append_vals (result, tzinfo.StandardName, wcslen (tzinfo.StandardName)); else if (n == TIME_ZONE_ID_DAYLIGHT) g_array_append_vals (result, tzinfo.DaylightName, wcslen (tzinfo.DaylightName)); break; case '%': g_array_append_vals (result, L"%", 1); break; } } else if (c <= 0xFFFF) { wchar_t wc = c; g_array_append_vals (result, &wc, 1); } else { glong nwc; wchar_t *ws; ws = g_ucs4_to_utf16 (&c, 1, NULL, &nwc, NULL); g_array_append_vals (result, ws, nwc); g_free (ws); } p = g_utf8_next_char (p); } convbuf = g_utf16_to_utf8 ((wchar_t *) result->data, result->len, NULL, &convlen, NULL); g_array_free (result, TRUE); if (!convbuf) { s[0] = '\0'; return 0; } if (slen <= convlen) { /* Ensure only whole characters are copied into the buffer. */ gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen); g_assert (end != NULL); convlen = end - convbuf; /* Return 0 because the buffer isn't large enough. */ retval = 0; } else retval = convlen; memcpy (s, convbuf, convlen); s[convlen] = '\0'; g_free (convbuf); return retval; } #endif gsize g_date_strftime (gchar *s, gsize slen, const gchar *format, const GDate *d) { struct tm tm; #ifndef G_OS_WIN32 gsize locale_format_len = 0; gchar *locale_format; gsize tmplen; gchar *tmpbuf; gsize tmpbufsize; gsize convlen = 0; gchar *convbuf; GError *error = NULL; gsize retval; #endif g_return_val_if_fail (g_date_valid (d), 0); g_return_val_if_fail (slen > 0, 0); g_return_val_if_fail (format != NULL, 0); g_return_val_if_fail (s != NULL, 0); g_date_to_struct_tm (d, &tm); #ifdef G_OS_WIN32 if (!g_utf8_validate (format, -1, NULL)) { s[0] = '\0'; return 0; } return win32_strftime_helper (d, format, &tm, s, slen); #else locale_format = g_locale_from_utf8 (format, -1, NULL, &locale_format_len, &error); if (error) { g_warning (G_STRLOC "Error converting format to locale encoding: %s\n", error->message); g_error_free (error); s[0] = '\0'; return 0; } tmpbufsize = MAX (128, locale_format_len * 2); while (TRUE) { tmpbuf = g_malloc (tmpbufsize); /* Set the first byte to something other than '\0', to be able to * recognize whether strftime actually failed or just returned "". */ tmpbuf[0] = '\1'; tmplen = strftime (tmpbuf, tmpbufsize, locale_format, &tm); if (tmplen == 0 && tmpbuf[0] != '\0') { g_free (tmpbuf); tmpbufsize *= 2; if (tmpbufsize > 65536) { g_warning (G_STRLOC "Maximum buffer size for g_date_strftime exceeded: giving up\n"); g_free (locale_format); s[0] = '\0'; return 0; } } else break; } g_free (locale_format); convbuf = g_locale_to_utf8 (tmpbuf, tmplen, NULL, &convlen, &error); g_free (tmpbuf); if (error) { g_warning (G_STRLOC "Error converting results of strftime to UTF-8: %s\n", error->message); g_error_free (error); s[0] = '\0'; return 0; } if (slen <= convlen) { /* Ensure only whole characters are copied into the buffer. */ gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen); g_assert (end != NULL); convlen = end - convbuf; /* Return 0 because the buffer isn't large enough. */ retval = 0; } else retval = convlen; memcpy (s, convbuf, convlen); s[convlen] = '\0'; g_free (convbuf); return retval; #endif }