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gmain: use Linux eventfd() for main context wake up
[glib.git] / glib / gdate.c
blob9b6fb4cf915e2b87d1dc15d8ff4a48da2a1eafc5
1 /* GLIB - Library of useful routines for C programming
2 * Copyright (C) 1995-1997 Peter Mattis, Spencer Kimball and Josh MacDonald
3 *
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
18 */
19
20 /*
21 * Modified by the GLib Team and others 1997-2000. See the AUTHORS
22 * file for a list of people on the GLib Team. See the ChangeLog
23 * files for a list of changes. These files are distributed with
24 * GLib at ftp://ftp.gtk.org/pub/gtk/.
25 */
26
27 /*
28 * MT safe
29 */
30
31 #include "config.h"
32 #include "glibconfig.h"
33
34 #define DEBUG_MSG(x) /* */
35 #ifdef G_ENABLE_DEBUG
36 /* #define DEBUG_MSG(args) g_message args ; */
37 #endif
38
39 #include <time.h>
40 #include <string.h>
41 #include <stdlib.h>
42 #include <locale.h>
43
44 #ifdef G_OS_WIN32
45 #include <windows.h>
46 #endif
47
48 #include "gdate.h"
49
50 #include "gconvert.h"
51 #include "gmem.h"
52 #include "gstrfuncs.h"
53 #include "gtestutils.h"
54 #include "gthread.h"
55 #include "gunicode.h"
56
57 #ifdef G_OS_WIN32
58 #include "garray.h"
59 #endif
60
61 GDate*
62 g_date_new (void)
63 {
64 GDate *d = g_new0 (GDate, 1); /* happily, 0 is the invalid flag for everything. */
65
66 return d;
67 }
68
69 GDate*
70 g_date_new_dmy (GDateDay day,
71 GDateMonth m,
72 GDateYear y)
73 {
74 GDate *d;
75 g_return_val_if_fail (g_date_valid_dmy (day, m, y), NULL);
76
77 d = g_new (GDate, 1);
78
79 d->julian = FALSE;
80 d->dmy = TRUE;
81
82 d->month = m;
83 d->day = day;
84 d->year = y;
85
86 g_assert (g_date_valid (d));
87
88 return d;
89 }
90
91 GDate*
92 g_date_new_julian (guint32 j)
93 {
94 GDate *d;
95 g_return_val_if_fail (g_date_valid_julian (j), NULL);
96
97 d = g_new (GDate, 1);
98
99 d->julian = TRUE;
100 d->dmy = FALSE;
101
102 d->julian_days = j;
103
104 g_assert (g_date_valid (d));
105
106 return d;
107 }
108
109 void
110 g_date_free (GDate *d)
111 {
112 g_return_if_fail (d != NULL);
113
114 g_free (d);
115 }
116
117 gboolean
118 g_date_valid (const GDate *d)
119 {
120 g_return_val_if_fail (d != NULL, FALSE);
121
122 return (d->julian || d->dmy);
123 }
124
125 static const guint8 days_in_months[2][13] =
126 { /* error, jan feb mar apr may jun jul aug sep oct nov dec */
127 { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
128 { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } /* leap year */
129 };
130
131 static const guint16 days_in_year[2][14] =
132 { /* 0, jan feb mar apr may jun jul aug sep oct nov dec */
133 { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
134 { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
135 };
136
137 gboolean
138 g_date_valid_month (GDateMonth m)
139 {
140 return ( (m > G_DATE_BAD_MONTH) && (m < 13) );
141 }
142
143 gboolean
144 g_date_valid_year (GDateYear y)
145 {
146 return ( y > G_DATE_BAD_YEAR );
147 }
148
149 gboolean
150 g_date_valid_day (GDateDay d)
151 {
152 return ( (d > G_DATE_BAD_DAY) && (d < 32) );
153 }
154
155 gboolean
156 g_date_valid_weekday (GDateWeekday w)
157 {
158 return ( (w > G_DATE_BAD_WEEKDAY) && (w < 8) );
159 }
160
161 gboolean
162 g_date_valid_julian (guint32 j)
163 {
164 return (j > G_DATE_BAD_JULIAN);
165 }
166
167 gboolean
168 g_date_valid_dmy (GDateDay d,
169 GDateMonth m,
170 GDateYear y)
171 {
172 return ( (m > G_DATE_BAD_MONTH) &&
173 (m < 13) &&
174 (d > G_DATE_BAD_DAY) &&
175 (y > G_DATE_BAD_YEAR) && /* must check before using g_date_is_leap_year */
176 (d <= (g_date_is_leap_year (y) ?
177 days_in_months[1][m] : days_in_months[0][m])) );
178 }
179
180
181 /* "Julian days" just means an absolute number of days, where Day 1 ==
182 * Jan 1, Year 1
183 */
184 static void
185 g_date_update_julian (const GDate *const_d)
186 {
187 GDate *d = (GDate *) const_d;
188 GDateYear year;
189 gint idx;
190
191 g_return_if_fail (d != NULL);
192 g_return_if_fail (d->dmy);
193 g_return_if_fail (!d->julian);
194 g_return_if_fail (g_date_valid_dmy (d->day, d->month, d->year));
195
196 /* What we actually do is: multiply years * 365 days in the year,
197 * add the number of years divided by 4, subtract the number of
198 * years divided by 100 and add the number of years divided by 400,
199 * which accounts for leap year stuff. Code from Steffen Beyer's
200 * DateCalc.
201 */
202
203 year = d->year - 1; /* we know d->year > 0 since it's valid */
204
205 d->julian_days = year * 365U;
206 d->julian_days += (year >>= 2); /* divide by 4 and add */
207 d->julian_days -= (year /= 25); /* divides original # years by 100 */
208 d->julian_days += year >> 2; /* divides by 4, which divides original by 400 */
209
210 idx = g_date_is_leap_year (d->year) ? 1 : 0;
211
212 d->julian_days += days_in_year[idx][d->month] + d->day;
213
214 g_return_if_fail (g_date_valid_julian (d->julian_days));
215
216 d->julian = TRUE;
217 }
218
219 static void
220 g_date_update_dmy (const GDate *const_d)
221 {
222 GDate *d = (GDate *) const_d;
223 GDateYear y;
224 GDateMonth m;
225 GDateDay day;
226
227 guint32 A, B, C, D, E, M;
228
229 g_return_if_fail (d != NULL);
230 g_return_if_fail (d->julian);
231 g_return_if_fail (!d->dmy);
232 g_return_if_fail (g_date_valid_julian (d->julian_days));
233
234 /* Formula taken from the Calendar FAQ; the formula was for the
235 * Julian Period which starts on 1 January 4713 BC, so we add
236 * 1,721,425 to the number of days before doing the formula.
237 *
238 * I'm sure this can be simplified for our 1 January 1 AD period
239 * start, but I can't figure out how to unpack the formula.
240 */
241
242 A = d->julian_days + 1721425 + 32045;
243 B = ( 4 *(A + 36524) )/ 146097 - 1;
244 C = A - (146097 * B)/4;
245 D = ( 4 * (C + 365) ) / 1461 - 1;
246 E = C - ((1461*D) / 4);
247 M = (5 * (E - 1) + 2)/153;
248
249 m = M + 3 - (12*(M/10));
250 day = E - (153*M + 2)/5;
251 y = 100 * B + D - 4800 + (M/10);
252
253 #ifdef G_ENABLE_DEBUG
254 if (!g_date_valid_dmy (day, m, y))
255 g_warning ("\nOOPS julian: %u computed dmy: %u %u %u\n",
256 d->julian_days, day, m, y);
257 #endif
258
259 d->month = m;
260 d->day = day;
261 d->year = y;
262
263 d->dmy = TRUE;
264 }
265
266 GDateWeekday
267 g_date_get_weekday (const GDate *d)
268 {
269 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_WEEKDAY);
270
271 if (!d->julian)
272 g_date_update_julian (d);
273
274 g_return_val_if_fail (d->julian, G_DATE_BAD_WEEKDAY);
275
276 return ((d->julian_days - 1) % 7) + 1;
277 }
278
279 GDateMonth
280 g_date_get_month (const GDate *d)
281 {
282 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH);
283
284 if (!d->dmy)
285 g_date_update_dmy (d);
286
287 g_return_val_if_fail (d->dmy, G_DATE_BAD_MONTH);
288
289 return d->month;
290 }
291
292 GDateYear
293 g_date_get_year (const GDate *d)
294 {
295 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR);
296
297 if (!d->dmy)
298 g_date_update_dmy (d);
299
300 g_return_val_if_fail (d->dmy, G_DATE_BAD_YEAR);
301
302 return d->year;
303 }
304
305 GDateDay
306 g_date_get_day (const GDate *d)
307 {
308 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY);
309
310 if (!d->dmy)
311 g_date_update_dmy (d);
312
313 g_return_val_if_fail (d->dmy, G_DATE_BAD_DAY);
314
315 return d->day;
316 }
317
318 guint32
319 g_date_get_julian (const GDate *d)
320 {
321 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_JULIAN);
322
323 if (!d->julian)
324 g_date_update_julian (d);
325
326 g_return_val_if_fail (d->julian, G_DATE_BAD_JULIAN);
327
328 return d->julian_days;
329 }
330
331 guint
332 g_date_get_day_of_year (const GDate *d)
333 {
334 gint idx;
335
336 g_return_val_if_fail (g_date_valid (d), 0);
337
338 if (!d->dmy)
339 g_date_update_dmy (d);
340
341 g_return_val_if_fail (d->dmy, 0);
342
343 idx = g_date_is_leap_year (d->year) ? 1 : 0;
344
345 return (days_in_year[idx][d->month] + d->day);
346 }
347
348 guint
349 g_date_get_monday_week_of_year (const GDate *d)
350 {
351 GDateWeekday wd;
352 guint day;
353 GDate first;
354
355 g_return_val_if_fail (g_date_valid (d), 0);
356
357 if (!d->dmy)
358 g_date_update_dmy (d);
359
360 g_return_val_if_fail (d->dmy, 0);
361
362 g_date_clear (&first, 1);
363
364 g_date_set_dmy (&first, 1, 1, d->year);
365
366 wd = g_date_get_weekday (&first) - 1; /* make Monday day 0 */
367 day = g_date_get_day_of_year (d) - 1;
368
369 return ((day + wd)/7U + (wd == 0 ? 1 : 0));
370 }
371
372 guint
373 g_date_get_sunday_week_of_year (const GDate *d)
374 {
375 GDateWeekday wd;
376 guint day;
377 GDate first;
378
379 g_return_val_if_fail (g_date_valid (d), 0);
380
381 if (!d->dmy)
382 g_date_update_dmy (d);
383
384 g_return_val_if_fail (d->dmy, 0);
385
386 g_date_clear (&first, 1);
387
388 g_date_set_dmy (&first, 1, 1, d->year);
389
390 wd = g_date_get_weekday (&first);
391 if (wd == 7) wd = 0; /* make Sunday day 0 */
392 day = g_date_get_day_of_year (d) - 1;
393
394 return ((day + wd)/7U + (wd == 0 ? 1 : 0));
395 }
396
397 /**
398 * g_date_get_iso8601_week_of_year:
399 * @date: a valid #GDate
400 *
401 * Returns the week of the year, where weeks are interpreted according
402 * to ISO 8601.
403 *
404 * Returns: ISO 8601 week number of the year.
405 *
406 * Since: 2.6
407 **/
408 guint
409 g_date_get_iso8601_week_of_year (const GDate *d)
410 {
411 guint j, d4, L, d1, w;
412
413 g_return_val_if_fail (g_date_valid (d), 0);
414
415 if (!d->julian)
416 g_date_update_julian (d);
417
418 g_return_val_if_fail (d->julian, 0);
419
420 /* Formula taken from the Calendar FAQ; the formula was for the
421 * Julian Period which starts on 1 January 4713 BC, so we add
422 * 1,721,425 to the number of days before doing the formula.
423 */
424 j = d->julian_days + 1721425;
425 d4 = (j + 31741 - (j % 7)) % 146097 % 36524 % 1461;
426 L = d4 / 1460;
427 d1 = ((d4 - L) % 365) + L;
428 w = d1 / 7 + 1;
429
430 return w;
431 }
432
433 gint
434 g_date_days_between (const GDate *d1,
435 const GDate *d2)
436 {
437 g_return_val_if_fail (g_date_valid (d1), 0);
438 g_return_val_if_fail (g_date_valid (d2), 0);
439
440 return (gint)g_date_get_julian (d2) - (gint)g_date_get_julian (d1);
441 }
442
443 void
444 g_date_clear (GDate *d, guint ndates)
445 {
446 g_return_if_fail (d != NULL);
447 g_return_if_fail (ndates != 0);
448
449 memset (d, 0x0, ndates*sizeof (GDate));
450 }
451
452 G_LOCK_DEFINE_STATIC (g_date_global);
453
454 /* These are for the parser, output to the user should use *
455 * g_date_strftime () - this creates more never-freed memory to annoy
456 * all those memory debugger users. :-)
457 */
458
459 static gchar *long_month_names[13] =
460 {
461 NULL,
462 };
463
464 static gchar *short_month_names[13] =
465 {
466 NULL,
467 };
468
469 /* This tells us if we need to update the parse info */
470 static gchar *current_locale = NULL;
471
472 /* order of these in the current locale */
473 static GDateDMY dmy_order[3] =
474 {
475 G_DATE_DAY, G_DATE_MONTH, G_DATE_YEAR
476 };
477
478 /* Where to chop two-digit years: i.e., for the 1930 default, numbers
479 * 29 and below are counted as in the year 2000, numbers 30 and above
480 * are counted as in the year 1900.
481 */
482
483 static const GDateYear twodigit_start_year = 1930;
484
485 /* It is impossible to enter a year between 1 AD and 99 AD with this
486 * in effect.
487 */
488 static gboolean using_twodigit_years = FALSE;
489
490 /* Adjustment of locale era to AD, non-zero means using locale era
491 */
492 static gint locale_era_adjust = 0;
493
494 struct _GDateParseTokens {
495 gint num_ints;
496 gint n[3];
497 guint month;
498 };
499
500 typedef struct _GDateParseTokens GDateParseTokens;
501
502 #define NUM_LEN 10
503
504 /* HOLDS: g_date_global_lock */
505 static void
506 g_date_fill_parse_tokens (const gchar *str, GDateParseTokens *pt)
507 {
508 gchar num[4][NUM_LEN+1];
509 gint i;
510 const guchar *s;
511
512 /* We count 4, but store 3; so we can give an error
513 * if there are 4.
514 */
515 num[0][0] = num[1][0] = num[2][0] = num[3][0] = '\0';
516
517 s = (const guchar *) str;
518 pt->num_ints = 0;
519 while (*s && pt->num_ints < 4)
520 {
521
522 i = 0;
523 while (*s && g_ascii_isdigit (*s) && i < NUM_LEN)
524 {
525 num[pt->num_ints][i] = *s;
526 ++s;
527 ++i;
528 }
529
530 if (i > 0)
531 {
532 num[pt->num_ints][i] = '\0';
533 ++(pt->num_ints);
534 }
535
536 if (*s == '\0') break;
537
538 ++s;
539 }
540
541 pt->n[0] = pt->num_ints > 0 ? atoi (num[0]) : 0;
542 pt->n[1] = pt->num_ints > 1 ? atoi (num[1]) : 0;
543 pt->n[2] = pt->num_ints > 2 ? atoi (num[2]) : 0;
544
545 pt->month = G_DATE_BAD_MONTH;
546
547 if (pt->num_ints < 3)
548 {
549 gchar *casefold;
550 gchar *normalized;
551
552 casefold = g_utf8_casefold (str, -1);
553 normalized = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
554 g_free (casefold);
555
556 i = 1;
557 while (i < 13)
558 {
559 if (long_month_names[i] != NULL)
560 {
561 const gchar *found = strstr (normalized, long_month_names[i]);
562
563 if (found != NULL)
564 {
565 pt->month = i;
566 break;
567 }
568 }
569
570 if (short_month_names[i] != NULL)
571 {
572 const gchar *found = strstr (normalized, short_month_names[i]);
573
574 if (found != NULL)
575 {
576 pt->month = i;
577 break;
578 }
579 }
580
581 ++i;
582 }
583
584 g_free (normalized);
585 }
586 }
587
588 /* HOLDS: g_date_global_lock */
589 static void
590 g_date_prepare_to_parse (const gchar *str,
591 GDateParseTokens *pt)
592 {
593 const gchar *locale = setlocale (LC_TIME, NULL);
594 gboolean recompute_localeinfo = FALSE;
595 GDate d;
596
597 g_return_if_fail (locale != NULL); /* should not happen */
598
599 g_date_clear (&d, 1); /* clear for scratch use */
600
601 if ( (current_locale == NULL) || (strcmp (locale, current_locale) != 0) )
602 recompute_localeinfo = TRUE; /* Uh, there used to be a reason for the temporary */
603
604 if (recompute_localeinfo)
605 {
606 int i = 1;
607 GDateParseTokens testpt;
608 gchar buf[128];
609
610 g_free (current_locale); /* still works if current_locale == NULL */
611
612 current_locale = g_strdup (locale);
613
614 short_month_names[0] = "Error";
615 long_month_names[0] = "Error";
616
617 while (i < 13)
618 {
619 gchar *casefold;
620
621 g_date_set_dmy (&d, 1, i, 1);
622
623 g_return_if_fail (g_date_valid (&d));
624
625 g_date_strftime (buf, 127, "%b", &d);
626
627 casefold = g_utf8_casefold (buf, -1);
628 g_free (short_month_names[i]);
629 short_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
630 g_free (casefold);
631
632 g_date_strftime (buf, 127, "%B", &d);
633 casefold = g_utf8_casefold (buf, -1);
634 g_free (long_month_names[i]);
635 long_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
636 g_free (casefold);
637
638 ++i;
639 }
640
641 /* Determine DMY order */
642
643 /* had to pick a random day - don't change this, some strftimes
644 * are broken on some days, and this one is good so far. */
645 g_date_set_dmy (&d, 4, 7, 1976);
646
647 g_date_strftime (buf, 127, "%x", &d);
648
649 g_date_fill_parse_tokens (buf, &testpt);
650
651 i = 0;
652 while (i < testpt.num_ints)
653 {
654 switch (testpt.n[i])
655 {
656 case 7:
657 dmy_order[i] = G_DATE_MONTH;
658 break;
659 case 4:
660 dmy_order[i] = G_DATE_DAY;
661 break;
662 case 76:
663 using_twodigit_years = TRUE; /* FALL THRU */
664 case 1976:
665 dmy_order[i] = G_DATE_YEAR;
666 break;
667 default:
668 /* assume locale era */
669 locale_era_adjust = 1976 - testpt.n[i];
670 dmy_order[i] = G_DATE_YEAR;
671 break;
672 }
673 ++i;
674 }
675
676 #if defined(G_ENABLE_DEBUG) && 0
677 DEBUG_MSG (("**GDate prepared a new set of locale-specific parse rules."));
678 i = 1;
679 while (i < 13)
680 {
681 DEBUG_MSG ((" %s %s", long_month_names[i], short_month_names[i]));
682 ++i;
683 }
684 if (using_twodigit_years)
685 {
686 DEBUG_MSG (("**Using twodigit years with cutoff year: %u", twodigit_start_year));
687 }
688 {
689 gchar *strings[3];
690 i = 0;
691 while (i < 3)
692 {
693 switch (dmy_order[i])
694 {
695 case G_DATE_MONTH:
696 strings[i] = "Month";
697 break;
698 case G_DATE_YEAR:
699 strings[i] = "Year";
700 break;
701 case G_DATE_DAY:
702 strings[i] = "Day";
703 break;
704 default:
705 strings[i] = NULL;
706 break;
707 }
708 ++i;
709 }
710 DEBUG_MSG (("**Order: %s, %s, %s", strings[0], strings[1], strings[2]));
711 DEBUG_MSG (("**Sample date in this locale: `%s'", buf));
712 }
713 #endif
714 }
715
716 g_date_fill_parse_tokens (str, pt);
717 }
718
719 void
720 g_date_set_parse (GDate *d,
721 const gchar *str)
722 {
723 GDateParseTokens pt;
724 guint m = G_DATE_BAD_MONTH, day = G_DATE_BAD_DAY, y = G_DATE_BAD_YEAR;
725
726 g_return_if_fail (d != NULL);
727
728 /* set invalid */
729 g_date_clear (d, 1);
730
731 G_LOCK (g_date_global);
732
733 g_date_prepare_to_parse (str, &pt);
734
735 DEBUG_MSG (("Found %d ints, `%d' `%d' `%d' and written out month %d",
736 pt.num_ints, pt.n[0], pt.n[1], pt.n[2], pt.month));
737
738
739 if (pt.num_ints == 4)
740 {
741 G_UNLOCK (g_date_global);
742 return; /* presumably a typo; bail out. */
743 }
744
745 if (pt.num_ints > 1)
746 {
747 int i = 0;
748 int j = 0;
749
750 g_assert (pt.num_ints < 4); /* i.e., it is 2 or 3 */
751
752 while (i < pt.num_ints && j < 3)
753 {
754 switch (dmy_order[j])
755 {
756 case G_DATE_MONTH:
757 {
758 if (pt.num_ints == 2 && pt.month != G_DATE_BAD_MONTH)
759 {
760 m = pt.month;
761 ++j; /* skip months, but don't skip this number */
762 continue;
763 }
764 else
765 m = pt.n[i];
766 }
767 break;
768 case G_DATE_DAY:
769 {
770 if (pt.num_ints == 2 && pt.month == G_DATE_BAD_MONTH)
771 {
772 day = 1;
773 ++j; /* skip days, since we may have month/year */
774 continue;
775 }
776 day = pt.n[i];
777 }
778 break;
779 case G_DATE_YEAR:
780 {
781 y = pt.n[i];
782
783 if (locale_era_adjust != 0)
784 {
785 y += locale_era_adjust;
786 }
787 else if (using_twodigit_years && y < 100)
788 {
789 guint two = twodigit_start_year % 100;
790 guint century = (twodigit_start_year / 100) * 100;
791
792 if (y < two)
793 century += 100;
794
795 y += century;
796 }
797 }
798 break;
799 default:
800 break;
801 }
802
803 ++i;
804 ++j;
805 }
806
807
808 if (pt.num_ints == 3 && !g_date_valid_dmy (day, m, y))
809 {
810 /* Try YYYY MM DD */
811 y = pt.n[0];
812 m = pt.n[1];
813 day = pt.n[2];
814
815 if (using_twodigit_years && y < 100)
816 y = G_DATE_BAD_YEAR; /* avoids ambiguity */
817 }
818 else if (pt.num_ints == 2)
819 {
820 if (m == G_DATE_BAD_MONTH && pt.month != G_DATE_BAD_MONTH)
821 m = pt.month;
822 }
823 }
824 else if (pt.num_ints == 1)
825 {
826 if (pt.month != G_DATE_BAD_MONTH)
827 {
828 /* Month name and year? */
829 m = pt.month;
830 day = 1;
831 y = pt.n[0];
832 }
833 else
834 {
835 /* Try yyyymmdd and yymmdd */
836
837 m = (pt.n[0]/100) % 100;
838 day = pt.n[0] % 100;
839 y = pt.n[0]/10000;
840
841 /* FIXME move this into a separate function */
842 if (using_twodigit_years && y < 100)
843 {
844 guint two = twodigit_start_year % 100;
845 guint century = (twodigit_start_year / 100) * 100;
846
847 if (y < two)
848 century += 100;
849
850 y += century;
851 }
852 }
853 }
854
855 /* See if we got anything valid out of all this. */
856 /* y < 8000 is to catch 19998 style typos; the library is OK up to 65535 or so */
857 if (y < 8000 && g_date_valid_dmy (day, m, y))
858 {
859 d->month = m;
860 d->day = day;
861 d->year = y;
862 d->dmy = TRUE;
863 }
864 #ifdef G_ENABLE_DEBUG
865 else
866 {
867 DEBUG_MSG (("Rejected DMY %u %u %u", day, m, y));
868 }
869 #endif
870 G_UNLOCK (g_date_global);
871 }
872
873 /**
874 * g_date_set_time_t:
875 * @date: a #GDate
876 * @timet: <type>time_t</type> value to set
877 *
878 * Sets the value of a date to the date corresponding to a time
879 * specified as a time_t. The time to date conversion is done using
880 * the user's current timezone.
881 *
882 * To set the value of a date to the current day, you could write:
883 * |[
884 * g_date_set_time_t (date, time (NULL));
885 * ]|
886 *
887 * Since: 2.10
888 */
889 void
890 g_date_set_time_t (GDate *date,
891 time_t timet)
892 {
893 struct tm tm;
894
895 g_return_if_fail (date != NULL);
896
897 #ifdef HAVE_LOCALTIME_R
898 localtime_r (&timet, &tm);
899 #else
900 {
901 struct tm *ptm = localtime (&timet);
902
903 if (ptm == NULL)
904 {
905 /* Happens at least in Microsoft's C library if you pass a
906 * negative time_t. Use 2000-01-01 as default date.
907 */
908 #ifndef G_DISABLE_CHECKS
909 g_return_if_fail_warning (G_LOG_DOMAIN, "g_date_set_time", "ptm != NULL");
910 #endif
911
912 tm.tm_mon = 0;
913 tm.tm_mday = 1;
914 tm.tm_year = 100;
915 }
916 else
917 memcpy ((void *) &tm, (void *) ptm, sizeof(struct tm));
918 }
919 #endif
920
921 date->julian = FALSE;
922
923 date->month = tm.tm_mon + 1;
924 date->day = tm.tm_mday;
925 date->year = tm.tm_year + 1900;
926
927 g_return_if_fail (g_date_valid_dmy (date->day, date->month, date->year));
928
929 date->dmy = TRUE;
930 }
931
932
933 /**
934 * g_date_set_time:
935 * @date: a #GDate.
936 * @time_: #GTime value to set.
937 *
938 * Sets the value of a date from a #GTime value.
939 * The time to date conversion is done using the user's current timezone.
940 *
941 * Deprecated: 2.10: Use g_date_set_time_t() instead.
942 */
943 void
944 g_date_set_time (GDate *date,
945 GTime time_)
946 {
947 g_date_set_time_t (date, (time_t) time_);
948 }
949
950 /**
951 * g_date_set_time_val:
952 * @date: a #GDate
953 * @timeval: #GTimeVal value to set
954 *
955 * Sets the value of a date from a #GTimeVal value. Note that the
956 * @tv_usec member is ignored, because #GDate can't make use of the
957 * additional precision.
958 *
959 * The time to date conversion is done using the user's current timezone.
960 *
961 * Since: 2.10
962 */
963 void
964 g_date_set_time_val (GDate *date,
965 GTimeVal *timeval)
966 {
967 g_date_set_time_t (date, (time_t) timeval->tv_sec);
968 }
969
970 void
971 g_date_set_month (GDate *d,
972 GDateMonth m)
973 {
974 g_return_if_fail (d != NULL);
975 g_return_if_fail (g_date_valid_month (m));
976
977 if (d->julian && !d->dmy) g_date_update_dmy(d);
978 d->julian = FALSE;
979
980 d->month = m;
981
982 if (g_date_valid_dmy (d->day, d->month, d->year))
983 d->dmy = TRUE;
984 else
985 d->dmy = FALSE;
986 }
987
988 void
989 g_date_set_day (GDate *d,
990 GDateDay day)
991 {
992 g_return_if_fail (d != NULL);
993 g_return_if_fail (g_date_valid_day (day));
994
995 if (d->julian && !d->dmy) g_date_update_dmy(d);
996 d->julian = FALSE;
997
998 d->day = day;
999
1000 if (g_date_valid_dmy (d->day, d->month, d->year))
1001 d->dmy = TRUE;
1002 else
1003 d->dmy = FALSE;
1004 }
1005
1006 void
1007 g_date_set_year (GDate *d,
1008 GDateYear y)
1009 {
1010 g_return_if_fail (d != NULL);
1011 g_return_if_fail (g_date_valid_year (y));
1012
1013 if (d->julian && !d->dmy) g_date_update_dmy(d);
1014 d->julian = FALSE;
1015
1016 d->year = y;
1017
1018 if (g_date_valid_dmy (d->day, d->month, d->year))
1019 d->dmy = TRUE;
1020 else
1021 d->dmy = FALSE;
1022 }
1023
1024 void
1025 g_date_set_dmy (GDate *d,
1026 GDateDay day,
1027 GDateMonth m,
1028 GDateYear y)
1029 {
1030 g_return_if_fail (d != NULL);
1031 g_return_if_fail (g_date_valid_dmy (day, m, y));
1032
1033 d->julian = FALSE;
1034
1035 d->month = m;
1036 d->day = day;
1037 d->year = y;
1038
1039 d->dmy = TRUE;
1040 }
1041
1042 void
1043 g_date_set_julian (GDate *d,
1044 guint32 j)
1045 {
1046 g_return_if_fail (d != NULL);
1047 g_return_if_fail (g_date_valid_julian (j));
1048
1049 d->julian_days = j;
1050 d->julian = TRUE;
1051 d->dmy = FALSE;
1052 }
1053
1054
1055 gboolean
1056 g_date_is_first_of_month (const GDate *d)
1057 {
1058 g_return_val_if_fail (g_date_valid (d), FALSE);
1059
1060 if (!d->dmy)
1061 g_date_update_dmy (d);
1062
1063 g_return_val_if_fail (d->dmy, FALSE);
1064
1065 if (d->day == 1) return TRUE;
1066 else return FALSE;
1067 }
1068
1069 gboolean
1070 g_date_is_last_of_month (const GDate *d)
1071 {
1072 gint idx;
1073
1074 g_return_val_if_fail (g_date_valid (d), FALSE);
1075
1076 if (!d->dmy)
1077 g_date_update_dmy (d);
1078
1079 g_return_val_if_fail (d->dmy, FALSE);
1080
1081 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1082
1083 if (d->day == days_in_months[idx][d->month]) return TRUE;
1084 else return FALSE;
1085 }
1086
1087 void
1088 g_date_add_days (GDate *d,
1089 guint ndays)
1090 {
1091 g_return_if_fail (g_date_valid (d));
1092
1093 if (!d->julian)
1094 g_date_update_julian (d);
1095
1096 g_return_if_fail (d->julian);
1097
1098 d->julian_days += ndays;
1099 d->dmy = FALSE;
1100 }
1101
1102 void
1103 g_date_subtract_days (GDate *d,
1104 guint ndays)
1105 {
1106 g_return_if_fail (g_date_valid (d));
1107
1108 if (!d->julian)
1109 g_date_update_julian (d);
1110
1111 g_return_if_fail (d->julian);
1112 g_return_if_fail (d->julian_days > ndays);
1113
1114 d->julian_days -= ndays;
1115 d->dmy = FALSE;
1116 }
1117
1118 void
1119 g_date_add_months (GDate *d,
1120 guint nmonths)
1121 {
1122 guint years, months;
1123 gint idx;
1124
1125 g_return_if_fail (g_date_valid (d));
1126
1127 if (!d->dmy)
1128 g_date_update_dmy (d);
1129
1130 g_return_if_fail (d->dmy);
1131
1132 nmonths += d->month - 1;
1133
1134 years = nmonths/12;
1135 months = nmonths%12;
1136
1137 d->month = months + 1;
1138 d->year += years;
1139
1140 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1141
1142 if (d->day > days_in_months[idx][d->month])
1143 d->day = days_in_months[idx][d->month];
1144
1145 d->julian = FALSE;
1146
1147 g_return_if_fail (g_date_valid (d));
1148 }
1149
1150 void
1151 g_date_subtract_months (GDate *d,
1152 guint nmonths)
1153 {
1154 guint years, months;
1155 gint idx;
1156
1157 g_return_if_fail (g_date_valid (d));
1158
1159 if (!d->dmy)
1160 g_date_update_dmy (d);
1161
1162 g_return_if_fail (d->dmy);
1163
1164 years = nmonths/12;
1165 months = nmonths%12;
1166
1167 g_return_if_fail (d->year > years);
1168
1169 d->year -= years;
1170
1171 if (d->month > months) d->month -= months;
1172 else
1173 {
1174 months -= d->month;
1175 d->month = 12 - months;
1176 d->year -= 1;
1177 }
1178
1179 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1180
1181 if (d->day > days_in_months[idx][d->month])
1182 d->day = days_in_months[idx][d->month];
1183
1184 d->julian = FALSE;
1185
1186 g_return_if_fail (g_date_valid (d));
1187 }
1188
1189 void
1190 g_date_add_years (GDate *d,
1191 guint nyears)
1192 {
1193 g_return_if_fail (g_date_valid (d));
1194
1195 if (!d->dmy)
1196 g_date_update_dmy (d);
1197
1198 g_return_if_fail (d->dmy);
1199
1200 d->year += nyears;
1201
1202 if (d->month == 2 && d->day == 29)
1203 {
1204 if (!g_date_is_leap_year (d->year))
1205 d->day = 28;
1206 }
1207
1208 d->julian = FALSE;
1209 }
1210
1211 void
1212 g_date_subtract_years (GDate *d,
1213 guint nyears)
1214 {
1215 g_return_if_fail (g_date_valid (d));
1216
1217 if (!d->dmy)
1218 g_date_update_dmy (d);
1219
1220 g_return_if_fail (d->dmy);
1221 g_return_if_fail (d->year > nyears);
1222
1223 d->year -= nyears;
1224
1225 if (d->month == 2 && d->day == 29)
1226 {
1227 if (!g_date_is_leap_year (d->year))
1228 d->day = 28;
1229 }
1230
1231 d->julian = FALSE;
1232 }
1233
1234 gboolean
1235 g_date_is_leap_year (GDateYear year)
1236 {
1237 g_return_val_if_fail (g_date_valid_year (year), FALSE);
1238
1239 return ( (((year % 4) == 0) && ((year % 100) != 0)) ||
1240 (year % 400) == 0 );
1241 }
1242
1243 guint8
1244 g_date_get_days_in_month (GDateMonth month,
1245 GDateYear year)
1246 {
1247 gint idx;
1248
1249 g_return_val_if_fail (g_date_valid_year (year), 0);
1250 g_return_val_if_fail (g_date_valid_month (month), 0);
1251
1252 idx = g_date_is_leap_year (year) ? 1 : 0;
1253
1254 return days_in_months[idx][month];
1255 }
1256
1257 guint8
1258 g_date_get_monday_weeks_in_year (GDateYear year)
1259 {
1260 GDate d;
1261
1262 g_return_val_if_fail (g_date_valid_year (year), 0);
1263
1264 g_date_clear (&d, 1);
1265 g_date_set_dmy (&d, 1, 1, year);
1266 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1267 g_date_set_dmy (&d, 31, 12, year);
1268 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1269 if (g_date_is_leap_year (year))
1270 {
1271 g_date_set_dmy (&d, 2, 1, year);
1272 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1273 g_date_set_dmy (&d, 30, 12, year);
1274 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1275 }
1276 return 52;
1277 }
1278
1279 guint8
1280 g_date_get_sunday_weeks_in_year (GDateYear year)
1281 {
1282 GDate d;
1283
1284 g_return_val_if_fail (g_date_valid_year (year), 0);
1285
1286 g_date_clear (&d, 1);
1287 g_date_set_dmy (&d, 1, 1, year);
1288 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1289 g_date_set_dmy (&d, 31, 12, year);
1290 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1291 if (g_date_is_leap_year (year))
1292 {
1293 g_date_set_dmy (&d, 2, 1, year);
1294 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1295 g_date_set_dmy (&d, 30, 12, year);
1296 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1297 }
1298 return 52;
1299 }
1300
1301 gint
1302 g_date_compare (const GDate *lhs,
1303 const GDate *rhs)
1304 {
1305 g_return_val_if_fail (lhs != NULL, 0);
1306 g_return_val_if_fail (rhs != NULL, 0);
1307 g_return_val_if_fail (g_date_valid (lhs), 0);
1308 g_return_val_if_fail (g_date_valid (rhs), 0);
1309
1310 /* Remember the self-comparison case! I think it works right now. */
1311
1312 while (TRUE)
1313 {
1314 if (lhs->julian && rhs->julian)
1315 {
1316 if (lhs->julian_days < rhs->julian_days) return -1;
1317 else if (lhs->julian_days > rhs->julian_days) return 1;
1318 else return 0;
1319 }
1320 else if (lhs->dmy && rhs->dmy)
1321 {
1322 if (lhs->year < rhs->year) return -1;
1323 else if (lhs->year > rhs->year) return 1;
1324 else
1325 {
1326 if (lhs->month < rhs->month) return -1;
1327 else if (lhs->month > rhs->month) return 1;
1328 else
1329 {
1330 if (lhs->day < rhs->day) return -1;
1331 else if (lhs->day > rhs->day) return 1;
1332 else return 0;
1333 }
1334
1335 }
1336
1337 }
1338 else
1339 {
1340 if (!lhs->julian) g_date_update_julian (lhs);
1341 if (!rhs->julian) g_date_update_julian (rhs);
1342 g_return_val_if_fail (lhs->julian, 0);
1343 g_return_val_if_fail (rhs->julian, 0);
1344 }
1345
1346 }
1347 return 0; /* warnings */
1348 }
1349
1350
1351 void
1352 g_date_to_struct_tm (const GDate *d,
1353 struct tm *tm)
1354 {
1355 GDateWeekday day;
1356
1357 g_return_if_fail (g_date_valid (d));
1358 g_return_if_fail (tm != NULL);
1359
1360 if (!d->dmy)
1361 g_date_update_dmy (d);
1362
1363 g_return_if_fail (d->dmy);
1364
1365 /* zero all the irrelevant fields to be sure they're valid */
1366
1367 /* On Linux and maybe other systems, there are weird non-POSIX
1368 * fields on the end of struct tm that choke strftime if they
1369 * contain garbage. So we need to 0 the entire struct, not just the
1370 * fields we know to exist.
1371 */
1372
1373 memset (tm, 0x0, sizeof (struct tm));
1374
1375 tm->tm_mday = d->day;
1376 tm->tm_mon = d->month - 1; /* 0-11 goes in tm */
1377 tm->tm_year = ((int)d->year) - 1900; /* X/Open says tm_year can be negative */
1378
1379 day = g_date_get_weekday (d);
1380 if (day == 7) day = 0; /* struct tm wants days since Sunday, so Sunday is 0 */
1381
1382 tm->tm_wday = (int)day;
1383
1384 tm->tm_yday = g_date_get_day_of_year (d) - 1; /* 0 to 365 */
1385 tm->tm_isdst = -1; /* -1 means "information not available" */
1386 }
1387
1388 void
1389 g_date_clamp (GDate *date,
1390 const GDate *min_date,
1391 const GDate *max_date)
1392 {
1393 g_return_if_fail (g_date_valid (date));
1394
1395 if (min_date != NULL)
1396 g_return_if_fail (g_date_valid (min_date));
1397
1398 if (max_date != NULL)
1399 g_return_if_fail (g_date_valid (max_date));
1400
1401 if (min_date != NULL && max_date != NULL)
1402 g_return_if_fail (g_date_compare (min_date, max_date) <= 0);
1403
1404 if (min_date && g_date_compare (date, min_date) < 0)
1405 *date = *min_date;
1406
1407 if (max_date && g_date_compare (max_date, date) < 0)
1408 *date = *max_date;
1409 }
1410
1411 void
1412 g_date_order (GDate *date1,
1413 GDate *date2)
1414 {
1415 g_return_if_fail (g_date_valid (date1));
1416 g_return_if_fail (g_date_valid (date2));
1417
1418 if (g_date_compare (date1, date2) > 0)
1419 {
1420 GDate tmp = *date1;
1421 *date1 = *date2;
1422 *date2 = tmp;
1423 }
1424 }
1425
1426 #ifdef G_OS_WIN32
1427 static gsize
1428 win32_strftime_helper (const GDate *d,
1429 const gchar *format,
1430 const struct tm *tm,
1431 gchar *s,
1432 gsize slen)
1433 {
1434 SYSTEMTIME systemtime;
1435 TIME_ZONE_INFORMATION tzinfo;
1436 LCID lcid;
1437 int n, k;
1438 GArray *result;
1439 const gchar *p;
1440 gunichar c;
1441 const wchar_t digits[] = L"0123456789";
1442 gchar *convbuf;
1443 glong convlen = 0;
1444 gsize retval;
1445
1446 systemtime.wYear = tm->tm_year + 1900;
1447 systemtime.wMonth = tm->tm_mon + 1;
1448 systemtime.wDayOfWeek = tm->tm_wday;
1449 systemtime.wDay = tm->tm_mday;
1450 systemtime.wHour = tm->tm_hour;
1451 systemtime.wMinute = tm->tm_min;
1452 systemtime.wSecond = tm->tm_sec;
1453 systemtime.wMilliseconds = 0;
1454
1455 lcid = GetThreadLocale ();
1456 result = g_array_sized_new (FALSE, FALSE, sizeof (wchar_t), MAX (128, strlen (format) * 2));
1457
1458 p = format;
1459 while (*p)
1460 {
1461 c = g_utf8_get_char (p);
1462 if (c == '%')
1463 {
1464 p = g_utf8_next_char (p);
1465 if (!*p)
1466 {
1467 s[0] = '\0';
1468 g_array_free (result, TRUE);
1469
1470 return 0;
1471 }
1472
1473 c = g_utf8_get_char (p);
1474 if (c == 'E' || c == 'O')
1475 {
1476 /* Ignore modified conversion specifiers for now. */
1477 p = g_utf8_next_char (p);
1478 if (!*p)
1479 {
1480 s[0] = '\0';
1481 g_array_free (result, TRUE);
1482
1483 return 0;
1484 }
1485
1486 c = g_utf8_get_char (p);
1487 }
1488
1489 switch (c)
1490 {
1491 case 'a':
1492 if (systemtime.wDayOfWeek == 0)
1493 k = 6;
1494 else
1495 k = systemtime.wDayOfWeek - 1;
1496 n = GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, NULL, 0);
1497 g_array_set_size (result, result->len + n);
1498 GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n);
1499 g_array_set_size (result, result->len - 1);
1500 break;
1501 case 'A':
1502 if (systemtime.wDayOfWeek == 0)
1503 k = 6;
1504 else
1505 k = systemtime.wDayOfWeek - 1;
1506 n = GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, NULL, 0);
1507 g_array_set_size (result, result->len + n);
1508 GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n);
1509 g_array_set_size (result, result->len - 1);
1510 break;
1511 case 'b':
1512 case 'h':
1513 n = GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, NULL, 0);
1514 g_array_set_size (result, result->len + n);
1515 GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n);
1516 g_array_set_size (result, result->len - 1);
1517 break;
1518 case 'B':
1519 n = GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, NULL, 0);
1520 g_array_set_size (result, result->len + n);
1521 GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n);
1522 g_array_set_size (result, result->len - 1);
1523 break;
1524 case 'c':
1525 n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1526 if (n > 0)
1527 {
1528 g_array_set_size (result, result->len + n);
1529 GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1530 g_array_set_size (result, result->len - 1);
1531 }
1532 g_array_append_vals (result, L" ", 1);
1533 n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1534 if (n > 0)
1535 {
1536 g_array_set_size (result, result->len + n);
1537 GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1538 g_array_set_size (result, result->len - 1);
1539 }
1540 break;
1541 case 'C':
1542 g_array_append_vals (result, digits + systemtime.wYear/1000, 1);
1543 g_array_append_vals (result, digits + (systemtime.wYear/1000)%10, 1);
1544 break;
1545 case 'd':
1546 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1547 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1548 break;
1549 case 'D':
1550 g_array_append_vals (result, digits + systemtime.wMonth/10, 1);
1551 g_array_append_vals (result, digits + systemtime.wMonth%10, 1);
1552 g_array_append_vals (result, L"/", 1);
1553 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1554 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1555 g_array_append_vals (result, L"/", 1);
1556 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1557 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1558 break;
1559 case 'e':
1560 if (systemtime.wDay >= 10)
1561 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1562 else
1563 g_array_append_vals (result, L" ", 1);
1564 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1565 break;
1566
1567 /* A GDate has no time fields, so for now we can
1568 * hardcode all time conversions into zeros (or 12 for
1569 * %I). The alternative code snippets in the #else
1570 * branches are here ready to be taken into use when
1571 * needed by a g_strftime() or g_date_and_time_format()
1572 * or whatever.
1573 */
1574 case 'H':
1575 #if 1
1576 g_array_append_vals (result, L"00", 2);
1577 #else
1578 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1579 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1580 #endif
1581 break;
1582 case 'I':
1583 #if 1
1584 g_array_append_vals (result, L"12", 2);
1585 #else
1586 if (systemtime.wHour == 0)
1587 g_array_append_vals (result, L"12", 2);
1588 else
1589 {
1590 g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1);
1591 g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1);
1592 }
1593 #endif
1594 break;
1595 case 'j':
1596 g_array_append_vals (result, digits + (tm->tm_yday+1)/100, 1);
1597 g_array_append_vals (result, digits + ((tm->tm_yday+1)/10)%10, 1);
1598 g_array_append_vals (result, digits + (tm->tm_yday+1)%10, 1);
1599 break;
1600 case 'm':
1601 g_array_append_vals (result, digits + systemtime.wMonth/10, 1);
1602 g_array_append_vals (result, digits + systemtime.wMonth%10, 1);
1603 break;
1604 case 'M':
1605 #if 1
1606 g_array_append_vals (result, L"00", 2);
1607 #else
1608 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1609 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1610 #endif
1611 break;
1612 case 'n':
1613 g_array_append_vals (result, L"\n", 1);
1614 break;
1615 case 'p':
1616 n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0);
1617 if (n > 0)
1618 {
1619 g_array_set_size (result, result->len + n);
1620 GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n);
1621 g_array_set_size (result, result->len - 1);
1622 }
1623 break;
1624 case 'r':
1625 /* This is a rather odd format. Hard to say what to do.
1626 * Let's always use the POSIX %I:%M:%S %p
1627 */
1628 #if 1
1629 g_array_append_vals (result, L"12:00:00", 8);
1630 #else
1631 if (systemtime.wHour == 0)
1632 g_array_append_vals (result, L"12", 2);
1633 else
1634 {
1635 g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1);
1636 g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1);
1637 }
1638 g_array_append_vals (result, L":", 1);
1639 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1640 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1641 g_array_append_vals (result, L":", 1);
1642 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1643 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1644 g_array_append_vals (result, L" ", 1);
1645 #endif
1646 n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0);
1647 if (n > 0)
1648 {
1649 g_array_set_size (result, result->len + n);
1650 GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n);
1651 g_array_set_size (result, result->len - 1);
1652 }
1653 break;
1654 case 'R':
1655 #if 1
1656 g_array_append_vals (result, L"00:00", 5);
1657 #else
1658 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1659 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1660 g_array_append_vals (result, L":", 1);
1661 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1662 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1663 #endif
1664 break;
1665 case 'S':
1666 #if 1
1667 g_array_append_vals (result, L"00", 2);
1668 #else
1669 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1670 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1671 #endif
1672 break;
1673 case 't':
1674 g_array_append_vals (result, L"\t", 1);
1675 break;
1676 case 'T':
1677 #if 1
1678 g_array_append_vals (result, L"00:00:00", 8);
1679 #else
1680 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1681 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1682 g_array_append_vals (result, L":", 1);
1683 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1684 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1685 g_array_append_vals (result, L":", 1);
1686 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1687 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1688 #endif
1689 break;
1690 case 'u':
1691 if (systemtime.wDayOfWeek == 0)
1692 g_array_append_vals (result, L"7", 1);
1693 else
1694 g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1);
1695 break;
1696 case 'U':
1697 n = g_date_get_sunday_week_of_year (d);
1698 g_array_append_vals (result, digits + n/10, 1);
1699 g_array_append_vals (result, digits + n%10, 1);
1700 break;
1701 case 'V':
1702 n = g_date_get_iso8601_week_of_year (d);
1703 g_array_append_vals (result, digits + n/10, 1);
1704 g_array_append_vals (result, digits + n%10, 1);
1705 break;
1706 case 'w':
1707 g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1);
1708 break;
1709 case 'W':
1710 n = g_date_get_monday_week_of_year (d);
1711 g_array_append_vals (result, digits + n/10, 1);
1712 g_array_append_vals (result, digits + n%10, 1);
1713 break;
1714 case 'x':
1715 n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1716 if (n > 0)
1717 {
1718 g_array_set_size (result, result->len + n);
1719 GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1720 g_array_set_size (result, result->len - 1);
1721 }
1722 break;
1723 case 'X':
1724 n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1725 if (n > 0)
1726 {
1727 g_array_set_size (result, result->len + n);
1728 GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1729 g_array_set_size (result, result->len - 1);
1730 }
1731 break;
1732 case 'y':
1733 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1734 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1735 break;
1736 case 'Y':
1737 g_array_append_vals (result, digits + systemtime.wYear/1000, 1);
1738 g_array_append_vals (result, digits + (systemtime.wYear/100)%10, 1);
1739 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1740 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1741 break;
1742 case 'Z':
1743 n = GetTimeZoneInformation (&tzinfo);
1744 if (n == TIME_ZONE_ID_UNKNOWN)
1745 ;
1746 else if (n == TIME_ZONE_ID_STANDARD)
1747 g_array_append_vals (result, tzinfo.StandardName, wcslen (tzinfo.StandardName));
1748 else if (n == TIME_ZONE_ID_DAYLIGHT)
1749 g_array_append_vals (result, tzinfo.DaylightName, wcslen (tzinfo.DaylightName));
1750 break;
1751 case '%':
1752 g_array_append_vals (result, L"%", 1);
1753 break;
1754 }
1755 }
1756 else if (c <= 0xFFFF)
1757 {
1758 wchar_t wc = c;
1759 g_array_append_vals (result, &wc, 1);
1760 }
1761 else
1762 {
1763 glong nwc;
1764 wchar_t *ws;
1765
1766 ws = g_ucs4_to_utf16 (&c, 1, NULL, &nwc, NULL);
1767 g_array_append_vals (result, ws, nwc);
1768 g_free (ws);
1769 }
1770 p = g_utf8_next_char (p);
1771 }
1772
1773 convbuf = g_utf16_to_utf8 ((wchar_t *) result->data, result->len, NULL, &convlen, NULL);
1774 g_array_free (result, TRUE);
1775
1776 if (!convbuf)
1777 {
1778 s[0] = '\0';
1779 return 0;
1780 }
1781
1782 if (slen <= convlen)
1783 {
1784 /* Ensure only whole characters are copied into the buffer. */
1785 gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen);
1786 g_assert (end != NULL);
1787 convlen = end - convbuf;
1788
1789 /* Return 0 because the buffer isn't large enough. */
1790 retval = 0;
1791 }
1792 else
1793 retval = convlen;
1794
1795 memcpy (s, convbuf, convlen);
1796 s[convlen] = '\0';
1797 g_free (convbuf);
1798
1799 return retval;
1800 }
1801
1802 #endif
1803
1804 gsize
1805 g_date_strftime (gchar *s,
1806 gsize slen,
1807 const gchar *format,
1808 const GDate *d)
1809 {
1810 struct tm tm;
1811 #ifndef G_OS_WIN32
1812 gsize locale_format_len = 0;
1813 gchar *locale_format;
1814 gsize tmplen;
1815 gchar *tmpbuf;
1816 gsize tmpbufsize;
1817 gsize convlen = 0;
1818 gchar *convbuf;
1819 GError *error = NULL;
1820 gsize retval;
1821 #endif
1822
1823 g_return_val_if_fail (g_date_valid (d), 0);
1824 g_return_val_if_fail (slen > 0, 0);
1825 g_return_val_if_fail (format != NULL, 0);
1826 g_return_val_if_fail (s != NULL, 0);
1827
1828 g_date_to_struct_tm (d, &tm);
1829
1830 #ifdef G_OS_WIN32
1831 if (!g_utf8_validate (format, -1, NULL))
1832 {
1833 s[0] = '\0';
1834 return 0;
1835 }
1836 return win32_strftime_helper (d, format, &tm, s, slen);
1837 #else
1838
1839 locale_format = g_locale_from_utf8 (format, -1, NULL, &locale_format_len, &error);
1840
1841 if (error)
1842 {
1843 g_warning (G_STRLOC "Error converting format to locale encoding: %s\n", error->message);
1844 g_error_free (error);
1845
1846 s[0] = '\0';
1847 return 0;
1848 }
1849
1850 tmpbufsize = MAX (128, locale_format_len * 2);
1851 while (TRUE)
1852 {
1853 tmpbuf = g_malloc (tmpbufsize);
1854
1855 /* Set the first byte to something other than '\0', to be able to
1856 * recognize whether strftime actually failed or just returned "".
1857 */
1858 tmpbuf[0] = '\1';
1859 tmplen = strftime (tmpbuf, tmpbufsize, locale_format, &tm);
1860
1861 if (tmplen == 0 && tmpbuf[0] != '\0')
1862 {
1863 g_free (tmpbuf);
1864 tmpbufsize *= 2;
1865
1866 if (tmpbufsize > 65536)
1867 {
1868 g_warning (G_STRLOC "Maximum buffer size for g_date_strftime exceeded: giving up\n");
1869 g_free (locale_format);
1870
1871 s[0] = '\0';
1872 return 0;
1873 }
1874 }
1875 else
1876 break;
1877 }
1878 g_free (locale_format);
1879
1880 convbuf = g_locale_to_utf8 (tmpbuf, tmplen, NULL, &convlen, &error);
1881 g_free (tmpbuf);
1882
1883 if (error)
1884 {
1885 g_warning (G_STRLOC "Error converting results of strftime to UTF-8: %s\n", error->message);
1886 g_error_free (error);
1887
1888 s[0] = '\0';
1889 return 0;
1890 }
1891
1892 if (slen <= convlen)
1893 {
1894 /* Ensure only whole characters are copied into the buffer.
1895 */
1896 gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen);
1897 g_assert (end != NULL);
1898 convlen = end - convbuf;
1899
1900 /* Return 0 because the buffer isn't large enough.
1901 */
1902 retval = 0;
1903 }
1904 else
1905 retval = convlen;
1906
1907 memcpy (s, convbuf, convlen);
1908 s[convlen] = '\0';
1909 g_free (convbuf);
1910
1911 return retval;
1912 #endif
1913 }
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