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add private GBuffer type
[glib.git] / glib / gdate.c
blobb31c0337b419b468f2e53f3f8c2748bd1fc257b2
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
33 #define DEBUG_MSG(x) /* */
34 #ifdef G_ENABLE_DEBUG
35 /* #define DEBUG_MSG(args) g_message args ; */
36 #endif
37
38 #include "glib.h"
39
40 #include <time.h>
41 #include <string.h>
42 #include <stdlib.h>
43 #include <locale.h>
44
45 #ifdef G_OS_WIN32
46 #include <windows.h>
47 #endif
48
49 #include "galias.h"
50
51 GDate*
52 g_date_new (void)
53 {
54 GDate *d = g_new0 (GDate, 1); /* happily, 0 is the invalid flag for everything. */
55
56 return d;
57 }
58
59 GDate*
60 g_date_new_dmy (GDateDay day,
61 GDateMonth m,
62 GDateYear y)
63 {
64 GDate *d;
65 g_return_val_if_fail (g_date_valid_dmy (day, m, y), NULL);
66
67 d = g_new (GDate, 1);
68
69 d->julian = FALSE;
70 d->dmy = TRUE;
71
72 d->month = m;
73 d->day = day;
74 d->year = y;
75
76 g_assert (g_date_valid (d));
77
78 return d;
79 }
80
81 GDate*
82 g_date_new_julian (guint32 j)
83 {
84 GDate *d;
85 g_return_val_if_fail (g_date_valid_julian (j), NULL);
86
87 d = g_new (GDate, 1);
88
89 d->julian = TRUE;
90 d->dmy = FALSE;
91
92 d->julian_days = j;
93
94 g_assert (g_date_valid (d));
95
96 return d;
97 }
98
99 void
100 g_date_free (GDate *d)
101 {
102 g_return_if_fail (d != NULL);
103
104 g_free (d);
105 }
106
107 gboolean
108 g_date_valid (const GDate *d)
109 {
110 g_return_val_if_fail (d != NULL, FALSE);
111
112 return (d->julian || d->dmy);
113 }
114
115 static const guint8 days_in_months[2][13] =
116 { /* error, jan feb mar apr may jun jul aug sep oct nov dec */
117 { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 },
118 { 0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 } /* leap year */
119 };
120
121 static const guint16 days_in_year[2][14] =
122 { /* 0, jan feb mar apr may jun jul aug sep oct nov dec */
123 { 0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
124 { 0, 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
125 };
126
127 gboolean
128 g_date_valid_month (GDateMonth m)
129 {
130 return ( (m > G_DATE_BAD_MONTH) && (m < 13) );
131 }
132
133 gboolean
134 g_date_valid_year (GDateYear y)
135 {
136 return ( y > G_DATE_BAD_YEAR );
137 }
138
139 gboolean
140 g_date_valid_day (GDateDay d)
141 {
142 return ( (d > G_DATE_BAD_DAY) && (d < 32) );
143 }
144
145 gboolean
146 g_date_valid_weekday (GDateWeekday w)
147 {
148 return ( (w > G_DATE_BAD_WEEKDAY) && (w < 8) );
149 }
150
151 gboolean
152 g_date_valid_julian (guint32 j)
153 {
154 return (j > G_DATE_BAD_JULIAN);
155 }
156
157 gboolean
158 g_date_valid_dmy (GDateDay d,
159 GDateMonth m,
160 GDateYear y)
161 {
162 return ( (m > G_DATE_BAD_MONTH) &&
163 (m < 13) &&
164 (d > G_DATE_BAD_DAY) &&
165 (y > G_DATE_BAD_YEAR) && /* must check before using g_date_is_leap_year */
166 (d <= (g_date_is_leap_year (y) ?
167 days_in_months[1][m] : days_in_months[0][m])) );
168 }
169
170
171 /* "Julian days" just means an absolute number of days, where Day 1 ==
172 * Jan 1, Year 1
173 */
174 static void
175 g_date_update_julian (const GDate *const_d)
176 {
177 GDate *d = (GDate *) const_d;
178 GDateYear year;
179 gint idx;
180
181 g_return_if_fail (d != NULL);
182 g_return_if_fail (d->dmy);
183 g_return_if_fail (!d->julian);
184 g_return_if_fail (g_date_valid_dmy (d->day, d->month, d->year));
185
186 /* What we actually do is: multiply years * 365 days in the year,
187 * add the number of years divided by 4, subtract the number of
188 * years divided by 100 and add the number of years divided by 400,
189 * which accounts for leap year stuff. Code from Steffen Beyer's
190 * DateCalc.
191 */
192
193 year = d->year - 1; /* we know d->year > 0 since it's valid */
194
195 d->julian_days = year * 365U;
196 d->julian_days += (year >>= 2); /* divide by 4 and add */
197 d->julian_days -= (year /= 25); /* divides original # years by 100 */
198 d->julian_days += year >> 2; /* divides by 4, which divides original by 400 */
199
200 idx = g_date_is_leap_year (d->year) ? 1 : 0;
201
202 d->julian_days += days_in_year[idx][d->month] + d->day;
203
204 g_return_if_fail (g_date_valid_julian (d->julian_days));
205
206 d->julian = TRUE;
207 }
208
209 static void
210 g_date_update_dmy (const GDate *const_d)
211 {
212 GDate *d = (GDate *) const_d;
213 GDateYear y;
214 GDateMonth m;
215 GDateDay day;
216
217 guint32 A, B, C, D, E, M;
218
219 g_return_if_fail (d != NULL);
220 g_return_if_fail (d->julian);
221 g_return_if_fail (!d->dmy);
222 g_return_if_fail (g_date_valid_julian (d->julian_days));
223
224 /* Formula taken from the Calendar FAQ; the formula was for the
225 * Julian Period which starts on 1 January 4713 BC, so we add
226 * 1,721,425 to the number of days before doing the formula.
227 *
228 * I'm sure this can be simplified for our 1 January 1 AD period
229 * start, but I can't figure out how to unpack the formula.
230 */
231
232 A = d->julian_days + 1721425 + 32045;
233 B = ( 4 *(A + 36524) )/ 146097 - 1;
234 C = A - (146097 * B)/4;
235 D = ( 4 * (C + 365) ) / 1461 - 1;
236 E = C - ((1461*D) / 4);
237 M = (5 * (E - 1) + 2)/153;
238
239 m = M + 3 - (12*(M/10));
240 day = E - (153*M + 2)/5;
241 y = 100 * B + D - 4800 + (M/10);
242
243 #ifdef G_ENABLE_DEBUG
244 if (!g_date_valid_dmy (day, m, y))
245 g_warning ("\nOOPS julian: %u computed dmy: %u %u %u\n",
246 d->julian_days, day, m, y);
247 #endif
248
249 d->month = m;
250 d->day = day;
251 d->year = y;
252
253 d->dmy = TRUE;
254 }
255
256 GDateWeekday
257 g_date_get_weekday (const GDate *d)
258 {
259 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_WEEKDAY);
260
261 if (!d->julian)
262 g_date_update_julian (d);
263
264 g_return_val_if_fail (d->julian, G_DATE_BAD_WEEKDAY);
265
266 return ((d->julian_days - 1) % 7) + 1;
267 }
268
269 GDateMonth
270 g_date_get_month (const GDate *d)
271 {
272 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_MONTH);
273
274 if (!d->dmy)
275 g_date_update_dmy (d);
276
277 g_return_val_if_fail (d->dmy, G_DATE_BAD_MONTH);
278
279 return d->month;
280 }
281
282 GDateYear
283 g_date_get_year (const GDate *d)
284 {
285 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_YEAR);
286
287 if (!d->dmy)
288 g_date_update_dmy (d);
289
290 g_return_val_if_fail (d->dmy, G_DATE_BAD_YEAR);
291
292 return d->year;
293 }
294
295 GDateDay
296 g_date_get_day (const GDate *d)
297 {
298 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_DAY);
299
300 if (!d->dmy)
301 g_date_update_dmy (d);
302
303 g_return_val_if_fail (d->dmy, G_DATE_BAD_DAY);
304
305 return d->day;
306 }
307
308 guint32
309 g_date_get_julian (const GDate *d)
310 {
311 g_return_val_if_fail (g_date_valid (d), G_DATE_BAD_JULIAN);
312
313 if (!d->julian)
314 g_date_update_julian (d);
315
316 g_return_val_if_fail (d->julian, G_DATE_BAD_JULIAN);
317
318 return d->julian_days;
319 }
320
321 guint
322 g_date_get_day_of_year (const GDate *d)
323 {
324 gint idx;
325
326 g_return_val_if_fail (g_date_valid (d), 0);
327
328 if (!d->dmy)
329 g_date_update_dmy (d);
330
331 g_return_val_if_fail (d->dmy, 0);
332
333 idx = g_date_is_leap_year (d->year) ? 1 : 0;
334
335 return (days_in_year[idx][d->month] + d->day);
336 }
337
338 guint
339 g_date_get_monday_week_of_year (const GDate *d)
340 {
341 GDateWeekday wd;
342 guint day;
343 GDate first;
344
345 g_return_val_if_fail (g_date_valid (d), 0);
346
347 if (!d->dmy)
348 g_date_update_dmy (d);
349
350 g_return_val_if_fail (d->dmy, 0);
351
352 g_date_clear (&first, 1);
353
354 g_date_set_dmy (&first, 1, 1, d->year);
355
356 wd = g_date_get_weekday (&first) - 1; /* make Monday day 0 */
357 day = g_date_get_day_of_year (d) - 1;
358
359 return ((day + wd)/7U + (wd == 0 ? 1 : 0));
360 }
361
362 guint
363 g_date_get_sunday_week_of_year (const GDate *d)
364 {
365 GDateWeekday wd;
366 guint day;
367 GDate first;
368
369 g_return_val_if_fail (g_date_valid (d), 0);
370
371 if (!d->dmy)
372 g_date_update_dmy (d);
373
374 g_return_val_if_fail (d->dmy, 0);
375
376 g_date_clear (&first, 1);
377
378 g_date_set_dmy (&first, 1, 1, d->year);
379
380 wd = g_date_get_weekday (&first);
381 if (wd == 7) wd = 0; /* make Sunday day 0 */
382 day = g_date_get_day_of_year (d) - 1;
383
384 return ((day + wd)/7U + (wd == 0 ? 1 : 0));
385 }
386
387 /**
388 * g_date_get_iso8601_week_of_year:
389 * @date: a valid #GDate
390 *
391 * Returns the week of the year, where weeks are interpreted according
392 * to ISO 8601.
393 *
394 * Returns: ISO 8601 week number of the year.
395 *
396 * Since: 2.6
397 **/
398 guint
399 g_date_get_iso8601_week_of_year (const GDate *d)
400 {
401 guint j, d4, L, d1, w;
402
403 g_return_val_if_fail (g_date_valid (d), 0);
404
405 if (!d->julian)
406 g_date_update_julian (d);
407
408 g_return_val_if_fail (d->julian, 0);
409
410 /* Formula taken from the Calendar FAQ; the formula was for the
411 * Julian Period which starts on 1 January 4713 BC, so we add
412 * 1,721,425 to the number of days before doing the formula.
413 */
414 j = d->julian_days + 1721425;
415 d4 = (j + 31741 - (j % 7)) % 146097 % 36524 % 1461;
416 L = d4 / 1460;
417 d1 = ((d4 - L) % 365) + L;
418 w = d1 / 7 + 1;
419
420 return w;
421 }
422
423 gint
424 g_date_days_between (const GDate *d1,
425 const GDate *d2)
426 {
427 g_return_val_if_fail (g_date_valid (d1), 0);
428 g_return_val_if_fail (g_date_valid (d2), 0);
429
430 return (gint)g_date_get_julian (d2) - (gint)g_date_get_julian (d1);
431 }
432
433 void
434 g_date_clear (GDate *d, guint ndates)
435 {
436 g_return_if_fail (d != NULL);
437 g_return_if_fail (ndates != 0);
438
439 memset (d, 0x0, ndates*sizeof (GDate));
440 }
441
442 G_LOCK_DEFINE_STATIC (g_date_global);
443
444 /* These are for the parser, output to the user should use *
445 * g_date_strftime () - this creates more never-freed memory to annoy
446 * all those memory debugger users. :-)
447 */
448
449 static gchar *long_month_names[13] =
450 {
451 NULL,
452 };
453
454 static gchar *short_month_names[13] =
455 {
456 NULL,
457 };
458
459 /* This tells us if we need to update the parse info */
460 static gchar *current_locale = NULL;
461
462 /* order of these in the current locale */
463 static GDateDMY dmy_order[3] =
464 {
465 G_DATE_DAY, G_DATE_MONTH, G_DATE_YEAR
466 };
467
468 /* Where to chop two-digit years: i.e., for the 1930 default, numbers
469 * 29 and below are counted as in the year 2000, numbers 30 and above
470 * are counted as in the year 1900.
471 */
472
473 static const GDateYear twodigit_start_year = 1930;
474
475 /* It is impossible to enter a year between 1 AD and 99 AD with this
476 * in effect.
477 */
478 static gboolean using_twodigit_years = FALSE;
479
480 /* Adjustment of locale era to AD, non-zero means using locale era
481 */
482 static gint locale_era_adjust = 0;
483
484 struct _GDateParseTokens {
485 gint num_ints;
486 gint n[3];
487 guint month;
488 };
489
490 typedef struct _GDateParseTokens GDateParseTokens;
491
492 #define NUM_LEN 10
493
494 /* HOLDS: g_date_global_lock */
495 static void
496 g_date_fill_parse_tokens (const gchar *str, GDateParseTokens *pt)
497 {
498 gchar num[4][NUM_LEN+1];
499 gint i;
500 const guchar *s;
501
502 /* We count 4, but store 3; so we can give an error
503 * if there are 4.
504 */
505 num[0][0] = num[1][0] = num[2][0] = num[3][0] = '\0';
506
507 s = (const guchar *) str;
508 pt->num_ints = 0;
509 while (*s && pt->num_ints < 4)
510 {
511
512 i = 0;
513 while (*s && g_ascii_isdigit (*s) && i < NUM_LEN)
514 {
515 num[pt->num_ints][i] = *s;
516 ++s;
517 ++i;
518 }
519
520 if (i > 0)
521 {
522 num[pt->num_ints][i] = '\0';
523 ++(pt->num_ints);
524 }
525
526 if (*s == '\0') break;
527
528 ++s;
529 }
530
531 pt->n[0] = pt->num_ints > 0 ? atoi (num[0]) : 0;
532 pt->n[1] = pt->num_ints > 1 ? atoi (num[1]) : 0;
533 pt->n[2] = pt->num_ints > 2 ? atoi (num[2]) : 0;
534
535 pt->month = G_DATE_BAD_MONTH;
536
537 if (pt->num_ints < 3)
538 {
539 gchar *casefold;
540 gchar *normalized;
541
542 casefold = g_utf8_casefold (str, -1);
543 normalized = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
544 g_free (casefold);
545
546 i = 1;
547 while (i < 13)
548 {
549 if (long_month_names[i] != NULL)
550 {
551 const gchar *found = strstr (normalized, long_month_names[i]);
552
553 if (found != NULL)
554 {
555 pt->month = i;
556 break;
557 }
558 }
559
560 if (short_month_names[i] != NULL)
561 {
562 const gchar *found = strstr (normalized, short_month_names[i]);
563
564 if (found != NULL)
565 {
566 pt->month = i;
567 break;
568 }
569 }
570
571 ++i;
572 }
573
574 g_free (normalized);
575 }
576 }
577
578 /* HOLDS: g_date_global_lock */
579 static void
580 g_date_prepare_to_parse (const gchar *str,
581 GDateParseTokens *pt)
582 {
583 const gchar *locale = setlocale (LC_TIME, NULL);
584 gboolean recompute_localeinfo = FALSE;
585 GDate d;
586
587 g_return_if_fail (locale != NULL); /* should not happen */
588
589 g_date_clear (&d, 1); /* clear for scratch use */
590
591 if ( (current_locale == NULL) || (strcmp (locale, current_locale) != 0) )
592 recompute_localeinfo = TRUE; /* Uh, there used to be a reason for the temporary */
593
594 if (recompute_localeinfo)
595 {
596 int i = 1;
597 GDateParseTokens testpt;
598 gchar buf[128];
599
600 g_free (current_locale); /* still works if current_locale == NULL */
601
602 current_locale = g_strdup (locale);
603
604 short_month_names[0] = "Error";
605 long_month_names[0] = "Error";
606
607 while (i < 13)
608 {
609 gchar *casefold;
610
611 g_date_set_dmy (&d, 1, i, 1);
612
613 g_return_if_fail (g_date_valid (&d));
614
615 g_date_strftime (buf, 127, "%b", &d);
616
617 casefold = g_utf8_casefold (buf, -1);
618 g_free (short_month_names[i]);
619 short_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
620 g_free (casefold);
621
622 g_date_strftime (buf, 127, "%B", &d);
623 casefold = g_utf8_casefold (buf, -1);
624 g_free (long_month_names[i]);
625 long_month_names[i] = g_utf8_normalize (casefold, -1, G_NORMALIZE_ALL);
626 g_free (casefold);
627
628 ++i;
629 }
630
631 /* Determine DMY order */
632
633 /* had to pick a random day - don't change this, some strftimes
634 * are broken on some days, and this one is good so far. */
635 g_date_set_dmy (&d, 4, 7, 1976);
636
637 g_date_strftime (buf, 127, "%x", &d);
638
639 g_date_fill_parse_tokens (buf, &testpt);
640
641 i = 0;
642 while (i < testpt.num_ints)
643 {
644 switch (testpt.n[i])
645 {
646 case 7:
647 dmy_order[i] = G_DATE_MONTH;
648 break;
649 case 4:
650 dmy_order[i] = G_DATE_DAY;
651 break;
652 case 76:
653 using_twodigit_years = TRUE; /* FALL THRU */
654 case 1976:
655 dmy_order[i] = G_DATE_YEAR;
656 break;
657 default:
658 /* assume locale era */
659 locale_era_adjust = 1976 - testpt.n[i];
660 dmy_order[i] = G_DATE_YEAR;
661 break;
662 }
663 ++i;
664 }
665
666 #ifdef G_ENABLE_DEBUG
667 DEBUG_MSG (("**GDate prepared a new set of locale-specific parse rules."));
668 i = 1;
669 while (i < 13)
670 {
671 DEBUG_MSG ((" %s %s", long_month_names[i], short_month_names[i]));
672 ++i;
673 }
674 if (using_twodigit_years)
675 {
676 DEBUG_MSG (("**Using twodigit years with cutoff year: %u", twodigit_start_year));
677 }
678 {
679 gchar *strings[3];
680 i = 0;
681 while (i < 3)
682 {
683 switch (dmy_order[i])
684 {
685 case G_DATE_MONTH:
686 strings[i] = "Month";
687 break;
688 case G_DATE_YEAR:
689 strings[i] = "Year";
690 break;
691 case G_DATE_DAY:
692 strings[i] = "Day";
693 break;
694 default:
695 strings[i] = NULL;
696 break;
697 }
698 ++i;
699 }
700 DEBUG_MSG (("**Order: %s, %s, %s", strings[0], strings[1], strings[2]));
701 DEBUG_MSG (("**Sample date in this locale: `%s'", buf));
702 }
703 #endif
704 }
705
706 g_date_fill_parse_tokens (str, pt);
707 }
708
709 void
710 g_date_set_parse (GDate *d,
711 const gchar *str)
712 {
713 GDateParseTokens pt;
714 guint m = G_DATE_BAD_MONTH, day = G_DATE_BAD_DAY, y = G_DATE_BAD_YEAR;
715
716 g_return_if_fail (d != NULL);
717
718 /* set invalid */
719 g_date_clear (d, 1);
720
721 G_LOCK (g_date_global);
722
723 g_date_prepare_to_parse (str, &pt);
724
725 DEBUG_MSG (("Found %d ints, `%d' `%d' `%d' and written out month %d",
726 pt.num_ints, pt.n[0], pt.n[1], pt.n[2], pt.month));
727
728
729 if (pt.num_ints == 4)
730 {
731 G_UNLOCK (g_date_global);
732 return; /* presumably a typo; bail out. */
733 }
734
735 if (pt.num_ints > 1)
736 {
737 int i = 0;
738 int j = 0;
739
740 g_assert (pt.num_ints < 4); /* i.e., it is 2 or 3 */
741
742 while (i < pt.num_ints && j < 3)
743 {
744 switch (dmy_order[j])
745 {
746 case G_DATE_MONTH:
747 {
748 if (pt.num_ints == 2 && pt.month != G_DATE_BAD_MONTH)
749 {
750 m = pt.month;
751 ++j; /* skip months, but don't skip this number */
752 continue;
753 }
754 else
755 m = pt.n[i];
756 }
757 break;
758 case G_DATE_DAY:
759 {
760 if (pt.num_ints == 2 && pt.month == G_DATE_BAD_MONTH)
761 {
762 day = 1;
763 ++j; /* skip days, since we may have month/year */
764 continue;
765 }
766 day = pt.n[i];
767 }
768 break;
769 case G_DATE_YEAR:
770 {
771 y = pt.n[i];
772
773 if (locale_era_adjust != 0)
774 {
775 y += locale_era_adjust;
776 }
777 else if (using_twodigit_years && y < 100)
778 {
779 guint two = twodigit_start_year % 100;
780 guint century = (twodigit_start_year / 100) * 100;
781
782 if (y < two)
783 century += 100;
784
785 y += century;
786 }
787 }
788 break;
789 default:
790 break;
791 }
792
793 ++i;
794 ++j;
795 }
796
797
798 if (pt.num_ints == 3 && !g_date_valid_dmy (day, m, y))
799 {
800 /* Try YYYY MM DD */
801 y = pt.n[0];
802 m = pt.n[1];
803 day = pt.n[2];
804
805 if (using_twodigit_years && y < 100)
806 y = G_DATE_BAD_YEAR; /* avoids ambiguity */
807 }
808 else if (pt.num_ints == 2)
809 {
810 if (m == G_DATE_BAD_MONTH && pt.month != G_DATE_BAD_MONTH)
811 m = pt.month;
812 }
813 }
814 else if (pt.num_ints == 1)
815 {
816 if (pt.month != G_DATE_BAD_MONTH)
817 {
818 /* Month name and year? */
819 m = pt.month;
820 day = 1;
821 y = pt.n[0];
822 }
823 else
824 {
825 /* Try yyyymmdd and yymmdd */
826
827 m = (pt.n[0]/100) % 100;
828 day = pt.n[0] % 100;
829 y = pt.n[0]/10000;
830
831 /* FIXME move this into a separate function */
832 if (using_twodigit_years && y < 100)
833 {
834 guint two = twodigit_start_year % 100;
835 guint century = (twodigit_start_year / 100) * 100;
836
837 if (y < two)
838 century += 100;
839
840 y += century;
841 }
842 }
843 }
844
845 /* See if we got anything valid out of all this. */
846 /* y < 8000 is to catch 19998 style typos; the library is OK up to 65535 or so */
847 if (y < 8000 && g_date_valid_dmy (day, m, y))
848 {
849 d->month = m;
850 d->day = day;
851 d->year = y;
852 d->dmy = TRUE;
853 }
854 #ifdef G_ENABLE_DEBUG
855 else
856 {
857 DEBUG_MSG (("Rejected DMY %u %u %u", day, m, y));
858 }
859 #endif
860 G_UNLOCK (g_date_global);
861 }
862
863 /**
864 * g_date_set_time_t:
865 * @date: a #GDate
866 * @timet: <type>time_t</type> value to set
867 *
868 * Sets the value of a date to the date corresponding to a time
869 * specified as a time_t. The time to date conversion is done using
870 * the user's current timezone.
871 *
872 * To set the value of a date to the current day, you could write:
873 * |[
874 * g_date_set_time_t (date, time (NULL));
875 * ]|
876 *
877 * Since: 2.10
878 */
879 void
880 g_date_set_time_t (GDate *date,
881 time_t timet)
882 {
883 struct tm tm;
884
885 g_return_if_fail (date != NULL);
886
887 #ifdef HAVE_LOCALTIME_R
888 localtime_r (&timet, &tm);
889 #else
890 {
891 struct tm *ptm = localtime (&timet);
892
893 if (ptm == NULL)
894 {
895 /* Happens at least in Microsoft's C library if you pass a
896 * negative time_t. Use 2000-01-01 as default date.
897 */
898 #ifndef G_DISABLE_CHECKS
899 g_return_if_fail_warning (G_LOG_DOMAIN, "g_date_set_time", "ptm != NULL");
900 #endif
901
902 tm.tm_mon = 0;
903 tm.tm_mday = 1;
904 tm.tm_year = 100;
905 }
906 else
907 memcpy ((void *) &tm, (void *) ptm, sizeof(struct tm));
908 }
909 #endif
910
911 date->julian = FALSE;
912
913 date->month = tm.tm_mon + 1;
914 date->day = tm.tm_mday;
915 date->year = tm.tm_year + 1900;
916
917 g_return_if_fail (g_date_valid_dmy (date->day, date->month, date->year));
918
919 date->dmy = TRUE;
920 }
921
922
923 /**
924 * g_date_set_time:
925 * @date: a #GDate.
926 * @time_: #GTime value to set.
927 *
928 * Sets the value of a date from a #GTime value.
929 * The time to date conversion is done using the user's current timezone.
930 *
931 * Deprecated: 2.10: Use g_date_set_time_t() instead.
932 */
933 void
934 g_date_set_time (GDate *date,
935 GTime time_)
936 {
937 g_date_set_time_t (date, (time_t) time_);
938 }
939
940 /**
941 * g_date_set_time_val:
942 * @date: a #GDate
943 * @timeval: #GTimeVal value to set
944 *
945 * Sets the value of a date from a #GTimeVal value. Note that the
946 * @tv_usec member is ignored, because #GDate can't make use of the
947 * additional precision.
948 *
949 * Since: 2.10
950 */
951 void
952 g_date_set_time_val (GDate *date,
953 GTimeVal *timeval)
954 {
955 g_date_set_time_t (date, (time_t) timeval->tv_sec);
956 }
957
958 void
959 g_date_set_month (GDate *d,
960 GDateMonth m)
961 {
962 g_return_if_fail (d != NULL);
963 g_return_if_fail (g_date_valid_month (m));
964
965 if (d->julian && !d->dmy) g_date_update_dmy(d);
966 d->julian = FALSE;
967
968 d->month = m;
969
970 if (g_date_valid_dmy (d->day, d->month, d->year))
971 d->dmy = TRUE;
972 else
973 d->dmy = FALSE;
974 }
975
976 void
977 g_date_set_day (GDate *d,
978 GDateDay day)
979 {
980 g_return_if_fail (d != NULL);
981 g_return_if_fail (g_date_valid_day (day));
982
983 if (d->julian && !d->dmy) g_date_update_dmy(d);
984 d->julian = FALSE;
985
986 d->day = day;
987
988 if (g_date_valid_dmy (d->day, d->month, d->year))
989 d->dmy = TRUE;
990 else
991 d->dmy = FALSE;
992 }
993
994 void
995 g_date_set_year (GDate *d,
996 GDateYear y)
997 {
998 g_return_if_fail (d != NULL);
999 g_return_if_fail (g_date_valid_year (y));
1000
1001 if (d->julian && !d->dmy) g_date_update_dmy(d);
1002 d->julian = FALSE;
1003
1004 d->year = y;
1005
1006 if (g_date_valid_dmy (d->day, d->month, d->year))
1007 d->dmy = TRUE;
1008 else
1009 d->dmy = FALSE;
1010 }
1011
1012 void
1013 g_date_set_dmy (GDate *d,
1014 GDateDay day,
1015 GDateMonth m,
1016 GDateYear y)
1017 {
1018 g_return_if_fail (d != NULL);
1019 g_return_if_fail (g_date_valid_dmy (day, m, y));
1020
1021 d->julian = FALSE;
1022
1023 d->month = m;
1024 d->day = day;
1025 d->year = y;
1026
1027 d->dmy = TRUE;
1028 }
1029
1030 void
1031 g_date_set_julian (GDate *d,
1032 guint32 j)
1033 {
1034 g_return_if_fail (d != NULL);
1035 g_return_if_fail (g_date_valid_julian (j));
1036
1037 d->julian_days = j;
1038 d->julian = TRUE;
1039 d->dmy = FALSE;
1040 }
1041
1042
1043 gboolean
1044 g_date_is_first_of_month (const GDate *d)
1045 {
1046 g_return_val_if_fail (g_date_valid (d), FALSE);
1047
1048 if (!d->dmy)
1049 g_date_update_dmy (d);
1050
1051 g_return_val_if_fail (d->dmy, FALSE);
1052
1053 if (d->day == 1) return TRUE;
1054 else return FALSE;
1055 }
1056
1057 gboolean
1058 g_date_is_last_of_month (const GDate *d)
1059 {
1060 gint idx;
1061
1062 g_return_val_if_fail (g_date_valid (d), FALSE);
1063
1064 if (!d->dmy)
1065 g_date_update_dmy (d);
1066
1067 g_return_val_if_fail (d->dmy, FALSE);
1068
1069 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1070
1071 if (d->day == days_in_months[idx][d->month]) return TRUE;
1072 else return FALSE;
1073 }
1074
1075 void
1076 g_date_add_days (GDate *d,
1077 guint ndays)
1078 {
1079 g_return_if_fail (g_date_valid (d));
1080
1081 if (!d->julian)
1082 g_date_update_julian (d);
1083
1084 g_return_if_fail (d->julian);
1085
1086 d->julian_days += ndays;
1087 d->dmy = FALSE;
1088 }
1089
1090 void
1091 g_date_subtract_days (GDate *d,
1092 guint ndays)
1093 {
1094 g_return_if_fail (g_date_valid (d));
1095
1096 if (!d->julian)
1097 g_date_update_julian (d);
1098
1099 g_return_if_fail (d->julian);
1100 g_return_if_fail (d->julian_days > ndays);
1101
1102 d->julian_days -= ndays;
1103 d->dmy = FALSE;
1104 }
1105
1106 void
1107 g_date_add_months (GDate *d,
1108 guint nmonths)
1109 {
1110 guint years, months;
1111 gint idx;
1112
1113 g_return_if_fail (g_date_valid (d));
1114
1115 if (!d->dmy)
1116 g_date_update_dmy (d);
1117
1118 g_return_if_fail (d->dmy);
1119
1120 nmonths += d->month - 1;
1121
1122 years = nmonths/12;
1123 months = nmonths%12;
1124
1125 d->month = months + 1;
1126 d->year += years;
1127
1128 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1129
1130 if (d->day > days_in_months[idx][d->month])
1131 d->day = days_in_months[idx][d->month];
1132
1133 d->julian = FALSE;
1134
1135 g_return_if_fail (g_date_valid (d));
1136 }
1137
1138 void
1139 g_date_subtract_months (GDate *d,
1140 guint nmonths)
1141 {
1142 guint years, months;
1143 gint idx;
1144
1145 g_return_if_fail (g_date_valid (d));
1146
1147 if (!d->dmy)
1148 g_date_update_dmy (d);
1149
1150 g_return_if_fail (d->dmy);
1151
1152 years = nmonths/12;
1153 months = nmonths%12;
1154
1155 g_return_if_fail (d->year > years);
1156
1157 d->year -= years;
1158
1159 if (d->month > months) d->month -= months;
1160 else
1161 {
1162 months -= d->month;
1163 d->month = 12 - months;
1164 d->year -= 1;
1165 }
1166
1167 idx = g_date_is_leap_year (d->year) ? 1 : 0;
1168
1169 if (d->day > days_in_months[idx][d->month])
1170 d->day = days_in_months[idx][d->month];
1171
1172 d->julian = FALSE;
1173
1174 g_return_if_fail (g_date_valid (d));
1175 }
1176
1177 void
1178 g_date_add_years (GDate *d,
1179 guint nyears)
1180 {
1181 g_return_if_fail (g_date_valid (d));
1182
1183 if (!d->dmy)
1184 g_date_update_dmy (d);
1185
1186 g_return_if_fail (d->dmy);
1187
1188 d->year += nyears;
1189
1190 if (d->month == 2 && d->day == 29)
1191 {
1192 if (!g_date_is_leap_year (d->year))
1193 d->day = 28;
1194 }
1195
1196 d->julian = FALSE;
1197 }
1198
1199 void
1200 g_date_subtract_years (GDate *d,
1201 guint nyears)
1202 {
1203 g_return_if_fail (g_date_valid (d));
1204
1205 if (!d->dmy)
1206 g_date_update_dmy (d);
1207
1208 g_return_if_fail (d->dmy);
1209 g_return_if_fail (d->year > nyears);
1210
1211 d->year -= nyears;
1212
1213 if (d->month == 2 && d->day == 29)
1214 {
1215 if (!g_date_is_leap_year (d->year))
1216 d->day = 28;
1217 }
1218
1219 d->julian = FALSE;
1220 }
1221
1222 gboolean
1223 g_date_is_leap_year (GDateYear year)
1224 {
1225 g_return_val_if_fail (g_date_valid_year (year), FALSE);
1226
1227 return ( (((year % 4) == 0) && ((year % 100) != 0)) ||
1228 (year % 400) == 0 );
1229 }
1230
1231 guint8
1232 g_date_get_days_in_month (GDateMonth month,
1233 GDateYear year)
1234 {
1235 gint idx;
1236
1237 g_return_val_if_fail (g_date_valid_year (year), 0);
1238 g_return_val_if_fail (g_date_valid_month (month), 0);
1239
1240 idx = g_date_is_leap_year (year) ? 1 : 0;
1241
1242 return days_in_months[idx][month];
1243 }
1244
1245 guint8
1246 g_date_get_monday_weeks_in_year (GDateYear year)
1247 {
1248 GDate d;
1249
1250 g_return_val_if_fail (g_date_valid_year (year), 0);
1251
1252 g_date_clear (&d, 1);
1253 g_date_set_dmy (&d, 1, 1, year);
1254 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1255 g_date_set_dmy (&d, 31, 12, year);
1256 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1257 if (g_date_is_leap_year (year))
1258 {
1259 g_date_set_dmy (&d, 2, 1, year);
1260 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1261 g_date_set_dmy (&d, 30, 12, year);
1262 if (g_date_get_weekday (&d) == G_DATE_MONDAY) return 53;
1263 }
1264 return 52;
1265 }
1266
1267 guint8
1268 g_date_get_sunday_weeks_in_year (GDateYear year)
1269 {
1270 GDate d;
1271
1272 g_return_val_if_fail (g_date_valid_year (year), 0);
1273
1274 g_date_clear (&d, 1);
1275 g_date_set_dmy (&d, 1, 1, year);
1276 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1277 g_date_set_dmy (&d, 31, 12, year);
1278 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1279 if (g_date_is_leap_year (year))
1280 {
1281 g_date_set_dmy (&d, 2, 1, year);
1282 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1283 g_date_set_dmy (&d, 30, 12, year);
1284 if (g_date_get_weekday (&d) == G_DATE_SUNDAY) return 53;
1285 }
1286 return 52;
1287 }
1288
1289 gint
1290 g_date_compare (const GDate *lhs,
1291 const GDate *rhs)
1292 {
1293 g_return_val_if_fail (lhs != NULL, 0);
1294 g_return_val_if_fail (rhs != NULL, 0);
1295 g_return_val_if_fail (g_date_valid (lhs), 0);
1296 g_return_val_if_fail (g_date_valid (rhs), 0);
1297
1298 /* Remember the self-comparison case! I think it works right now. */
1299
1300 while (TRUE)
1301 {
1302 if (lhs->julian && rhs->julian)
1303 {
1304 if (lhs->julian_days < rhs->julian_days) return -1;
1305 else if (lhs->julian_days > rhs->julian_days) return 1;
1306 else return 0;
1307 }
1308 else if (lhs->dmy && rhs->dmy)
1309 {
1310 if (lhs->year < rhs->year) return -1;
1311 else if (lhs->year > rhs->year) return 1;
1312 else
1313 {
1314 if (lhs->month < rhs->month) return -1;
1315 else if (lhs->month > rhs->month) return 1;
1316 else
1317 {
1318 if (lhs->day < rhs->day) return -1;
1319 else if (lhs->day > rhs->day) return 1;
1320 else return 0;
1321 }
1322
1323 }
1324
1325 }
1326 else
1327 {
1328 if (!lhs->julian) g_date_update_julian (lhs);
1329 if (!rhs->julian) g_date_update_julian (rhs);
1330 g_return_val_if_fail (lhs->julian, 0);
1331 g_return_val_if_fail (rhs->julian, 0);
1332 }
1333
1334 }
1335 return 0; /* warnings */
1336 }
1337
1338
1339 void
1340 g_date_to_struct_tm (const GDate *d,
1341 struct tm *tm)
1342 {
1343 GDateWeekday day;
1344
1345 g_return_if_fail (g_date_valid (d));
1346 g_return_if_fail (tm != NULL);
1347
1348 if (!d->dmy)
1349 g_date_update_dmy (d);
1350
1351 g_return_if_fail (d->dmy);
1352
1353 /* zero all the irrelevant fields to be sure they're valid */
1354
1355 /* On Linux and maybe other systems, there are weird non-POSIX
1356 * fields on the end of struct tm that choke strftime if they
1357 * contain garbage. So we need to 0 the entire struct, not just the
1358 * fields we know to exist.
1359 */
1360
1361 memset (tm, 0x0, sizeof (struct tm));
1362
1363 tm->tm_mday = d->day;
1364 tm->tm_mon = d->month - 1; /* 0-11 goes in tm */
1365 tm->tm_year = ((int)d->year) - 1900; /* X/Open says tm_year can be negative */
1366
1367 day = g_date_get_weekday (d);
1368 if (day == 7) day = 0; /* struct tm wants days since Sunday, so Sunday is 0 */
1369
1370 tm->tm_wday = (int)day;
1371
1372 tm->tm_yday = g_date_get_day_of_year (d) - 1; /* 0 to 365 */
1373 tm->tm_isdst = -1; /* -1 means "information not available" */
1374 }
1375
1376 void
1377 g_date_clamp (GDate *date,
1378 const GDate *min_date,
1379 const GDate *max_date)
1380 {
1381 g_return_if_fail (g_date_valid (date));
1382
1383 if (min_date != NULL)
1384 g_return_if_fail (g_date_valid (min_date));
1385
1386 if (max_date != NULL)
1387 g_return_if_fail (g_date_valid (max_date));
1388
1389 if (min_date != NULL && max_date != NULL)
1390 g_return_if_fail (g_date_compare (min_date, max_date) <= 0);
1391
1392 if (min_date && g_date_compare (date, min_date) < 0)
1393 *date = *min_date;
1394
1395 if (max_date && g_date_compare (max_date, date) < 0)
1396 *date = *max_date;
1397 }
1398
1399 void
1400 g_date_order (GDate *date1,
1401 GDate *date2)
1402 {
1403 g_return_if_fail (g_date_valid (date1));
1404 g_return_if_fail (g_date_valid (date2));
1405
1406 if (g_date_compare (date1, date2) > 0)
1407 {
1408 GDate tmp = *date1;
1409 *date1 = *date2;
1410 *date2 = tmp;
1411 }
1412 }
1413
1414 #ifdef G_OS_WIN32
1415 static gsize
1416 win32_strftime_helper (const GDate *d,
1417 const gchar *format,
1418 const struct tm *tm,
1419 gchar *s,
1420 gsize slen)
1421 {
1422 SYSTEMTIME systemtime;
1423 TIME_ZONE_INFORMATION tzinfo;
1424 LCID lcid;
1425 int n, k;
1426 GArray *result;
1427 const gchar *p;
1428 gunichar c;
1429 const wchar_t digits[] = L"0123456789";
1430 gchar *convbuf;
1431 glong convlen = 0;
1432 gsize retval;
1433
1434 systemtime.wYear = tm->tm_year + 1900;
1435 systemtime.wMonth = tm->tm_mon + 1;
1436 systemtime.wDayOfWeek = tm->tm_wday;
1437 systemtime.wDay = tm->tm_mday;
1438 systemtime.wHour = tm->tm_hour;
1439 systemtime.wMinute = tm->tm_min;
1440 systemtime.wSecond = tm->tm_sec;
1441 systemtime.wMilliseconds = 0;
1442
1443 lcid = GetThreadLocale ();
1444 result = g_array_sized_new (FALSE, FALSE, sizeof (wchar_t), MAX (128, strlen (format) * 2));
1445
1446 p = format;
1447 while (*p)
1448 {
1449 c = g_utf8_get_char (p);
1450 if (c == '%')
1451 {
1452 p = g_utf8_next_char (p);
1453 if (!*p)
1454 {
1455 s[0] = '\0';
1456 g_array_free (result, TRUE);
1457
1458 return 0;
1459 }
1460
1461 c = g_utf8_get_char (p);
1462 if (c == 'E' || c == 'O')
1463 {
1464 /* Ignore modified conversion specifiers for now. */
1465 p = g_utf8_next_char (p);
1466 if (!*p)
1467 {
1468 s[0] = '\0';
1469 g_array_free (result, TRUE);
1470
1471 return 0;
1472 }
1473
1474 c = g_utf8_get_char (p);
1475 }
1476
1477 switch (c)
1478 {
1479 case 'a':
1480 if (systemtime.wDayOfWeek == 0)
1481 k = 6;
1482 else
1483 k = systemtime.wDayOfWeek - 1;
1484 n = GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, NULL, 0);
1485 g_array_set_size (result, result->len + n);
1486 GetLocaleInfoW (lcid, LOCALE_SABBREVDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n);
1487 g_array_set_size (result, result->len - 1);
1488 break;
1489 case 'A':
1490 if (systemtime.wDayOfWeek == 0)
1491 k = 6;
1492 else
1493 k = systemtime.wDayOfWeek - 1;
1494 n = GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, NULL, 0);
1495 g_array_set_size (result, result->len + n);
1496 GetLocaleInfoW (lcid, LOCALE_SDAYNAME1+k, ((wchar_t *) result->data) + result->len - n, n);
1497 g_array_set_size (result, result->len - 1);
1498 break;
1499 case 'b':
1500 case 'h':
1501 n = GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, NULL, 0);
1502 g_array_set_size (result, result->len + n);
1503 GetLocaleInfoW (lcid, LOCALE_SABBREVMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n);
1504 g_array_set_size (result, result->len - 1);
1505 break;
1506 case 'B':
1507 n = GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, NULL, 0);
1508 g_array_set_size (result, result->len + n);
1509 GetLocaleInfoW (lcid, LOCALE_SMONTHNAME1+systemtime.wMonth-1, ((wchar_t *) result->data) + result->len - n, n);
1510 g_array_set_size (result, result->len - 1);
1511 break;
1512 case 'c':
1513 n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1514 if (n > 0)
1515 {
1516 g_array_set_size (result, result->len + n);
1517 GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1518 g_array_set_size (result, result->len - 1);
1519 }
1520 g_array_append_vals (result, L" ", 1);
1521 n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1522 if (n > 0)
1523 {
1524 g_array_set_size (result, result->len + n);
1525 GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1526 g_array_set_size (result, result->len - 1);
1527 }
1528 break;
1529 case 'C':
1530 g_array_append_vals (result, digits + systemtime.wYear/1000, 1);
1531 g_array_append_vals (result, digits + (systemtime.wYear/1000)%10, 1);
1532 break;
1533 case 'd':
1534 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1535 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1536 break;
1537 case 'D':
1538 g_array_append_vals (result, digits + systemtime.wMonth/10, 1);
1539 g_array_append_vals (result, digits + systemtime.wMonth%10, 1);
1540 g_array_append_vals (result, L"/", 1);
1541 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1542 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1543 g_array_append_vals (result, L"/", 1);
1544 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1545 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1546 break;
1547 case 'e':
1548 if (systemtime.wDay >= 10)
1549 g_array_append_vals (result, digits + systemtime.wDay/10, 1);
1550 else
1551 g_array_append_vals (result, L" ", 1);
1552 g_array_append_vals (result, digits + systemtime.wDay%10, 1);
1553 break;
1554
1555 /* A GDate has no time fields, so for now we can
1556 * hardcode all time conversions into zeros (or 12 for
1557 * %I). The alternative code snippets in the #else
1558 * branches are here ready to be taken into use when
1559 * needed by a g_strftime() or g_date_and_time_format()
1560 * or whatever.
1561 */
1562 case 'H':
1563 #if 1
1564 g_array_append_vals (result, L"00", 2);
1565 #else
1566 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1567 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1568 #endif
1569 break;
1570 case 'I':
1571 #if 1
1572 g_array_append_vals (result, L"12", 2);
1573 #else
1574 if (systemtime.wHour == 0)
1575 g_array_append_vals (result, L"12", 2);
1576 else
1577 {
1578 g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1);
1579 g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1);
1580 }
1581 #endif
1582 break;
1583 case 'j':
1584 g_array_append_vals (result, digits + (tm->tm_yday+1)/100, 1);
1585 g_array_append_vals (result, digits + ((tm->tm_yday+1)/10)%10, 1);
1586 g_array_append_vals (result, digits + (tm->tm_yday+1)%10, 1);
1587 break;
1588 case 'm':
1589 g_array_append_vals (result, digits + systemtime.wMonth/10, 1);
1590 g_array_append_vals (result, digits + systemtime.wMonth%10, 1);
1591 break;
1592 case 'M':
1593 #if 1
1594 g_array_append_vals (result, L"00", 2);
1595 #else
1596 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1597 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1598 #endif
1599 break;
1600 case 'n':
1601 g_array_append_vals (result, L"\n", 1);
1602 break;
1603 case 'p':
1604 n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0);
1605 if (n > 0)
1606 {
1607 g_array_set_size (result, result->len + n);
1608 GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n);
1609 g_array_set_size (result, result->len - 1);
1610 }
1611 break;
1612 case 'r':
1613 /* This is a rather odd format. Hard to say what to do.
1614 * Let's always use the POSIX %I:%M:%S %p
1615 */
1616 #if 1
1617 g_array_append_vals (result, L"12:00:00", 8);
1618 #else
1619 if (systemtime.wHour == 0)
1620 g_array_append_vals (result, L"12", 2);
1621 else
1622 {
1623 g_array_append_vals (result, digits + (systemtime.wHour%12)/10, 1);
1624 g_array_append_vals (result, digits + (systemtime.wHour%12)%10, 1);
1625 }
1626 g_array_append_vals (result, L":", 1);
1627 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1628 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1629 g_array_append_vals (result, L":", 1);
1630 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1631 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1632 g_array_append_vals (result, L" ", 1);
1633 #endif
1634 n = GetTimeFormatW (lcid, 0, &systemtime, L"tt", NULL, 0);
1635 if (n > 0)
1636 {
1637 g_array_set_size (result, result->len + n);
1638 GetTimeFormatW (lcid, 0, &systemtime, L"tt", ((wchar_t *) result->data) + result->len - n, n);
1639 g_array_set_size (result, result->len - 1);
1640 }
1641 break;
1642 case 'R':
1643 #if 1
1644 g_array_append_vals (result, L"00:00", 5);
1645 #else
1646 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1647 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1648 g_array_append_vals (result, L":", 1);
1649 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1650 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1651 #endif
1652 break;
1653 case 'S':
1654 #if 1
1655 g_array_append_vals (result, L"00", 2);
1656 #else
1657 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1658 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1659 #endif
1660 break;
1661 case 't':
1662 g_array_append_vals (result, L"\t", 1);
1663 break;
1664 case 'T':
1665 #if 1
1666 g_array_append_vals (result, L"00:00:00", 8);
1667 #else
1668 g_array_append_vals (result, digits + systemtime.wHour/10, 1);
1669 g_array_append_vals (result, digits + systemtime.wHour%10, 1);
1670 g_array_append_vals (result, L":", 1);
1671 g_array_append_vals (result, digits + systemtime.wMinute/10, 1);
1672 g_array_append_vals (result, digits + systemtime.wMinute%10, 1);
1673 g_array_append_vals (result, L":", 1);
1674 g_array_append_vals (result, digits + systemtime.wSecond/10, 1);
1675 g_array_append_vals (result, digits + systemtime.wSecond%10, 1);
1676 #endif
1677 break;
1678 case 'u':
1679 if (systemtime.wDayOfWeek == 0)
1680 g_array_append_vals (result, L"7", 1);
1681 else
1682 g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1);
1683 break;
1684 case 'U':
1685 n = g_date_get_sunday_week_of_year (d);
1686 g_array_append_vals (result, digits + n/10, 1);
1687 g_array_append_vals (result, digits + n%10, 1);
1688 break;
1689 case 'V':
1690 n = g_date_get_iso8601_week_of_year (d);
1691 g_array_append_vals (result, digits + n/10, 1);
1692 g_array_append_vals (result, digits + n%10, 1);
1693 break;
1694 case 'w':
1695 g_array_append_vals (result, digits + systemtime.wDayOfWeek, 1);
1696 break;
1697 case 'W':
1698 n = g_date_get_monday_week_of_year (d);
1699 g_array_append_vals (result, digits + n/10, 1);
1700 g_array_append_vals (result, digits + n%10, 1);
1701 break;
1702 case 'x':
1703 n = GetDateFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1704 if (n > 0)
1705 {
1706 g_array_set_size (result, result->len + n);
1707 GetDateFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1708 g_array_set_size (result, result->len - 1);
1709 }
1710 break;
1711 case 'X':
1712 n = GetTimeFormatW (lcid, 0, &systemtime, NULL, NULL, 0);
1713 if (n > 0)
1714 {
1715 g_array_set_size (result, result->len + n);
1716 GetTimeFormatW (lcid, 0, &systemtime, NULL, ((wchar_t *) result->data) + result->len - n, n);
1717 g_array_set_size (result, result->len - 1);
1718 }
1719 break;
1720 case 'y':
1721 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1722 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1723 break;
1724 case 'Y':
1725 g_array_append_vals (result, digits + systemtime.wYear/1000, 1);
1726 g_array_append_vals (result, digits + (systemtime.wYear/100)%10, 1);
1727 g_array_append_vals (result, digits + (systemtime.wYear/10)%10, 1);
1728 g_array_append_vals (result, digits + systemtime.wYear%10, 1);
1729 break;
1730 case 'Z':
1731 n = GetTimeZoneInformation (&tzinfo);
1732 if (n == TIME_ZONE_ID_UNKNOWN)
1733 ;
1734 else if (n == TIME_ZONE_ID_STANDARD)
1735 g_array_append_vals (result, tzinfo.StandardName, wcslen (tzinfo.StandardName));
1736 else if (n == TIME_ZONE_ID_DAYLIGHT)
1737 g_array_append_vals (result, tzinfo.DaylightName, wcslen (tzinfo.DaylightName));
1738 break;
1739 case '%':
1740 g_array_append_vals (result, L"%", 1);
1741 break;
1742 }
1743 }
1744 else if (c <= 0xFFFF)
1745 {
1746 wchar_t wc = c;
1747 g_array_append_vals (result, &wc, 1);
1748 }
1749 else
1750 {
1751 glong nwc;
1752 wchar_t *ws;
1753
1754 ws = g_ucs4_to_utf16 (&c, 1, NULL, &nwc, NULL);
1755 g_array_append_vals (result, ws, nwc);
1756 g_free (ws);
1757 }
1758 p = g_utf8_next_char (p);
1759 }
1760
1761 convbuf = g_utf16_to_utf8 ((wchar_t *) result->data, result->len, NULL, &convlen, NULL);
1762 g_array_free (result, TRUE);
1763
1764 if (!convbuf)
1765 {
1766 s[0] = '\0';
1767 return 0;
1768 }
1769
1770 if (slen <= convlen)
1771 {
1772 /* Ensure only whole characters are copied into the buffer. */
1773 gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen);
1774 g_assert (end != NULL);
1775 convlen = end - convbuf;
1776
1777 /* Return 0 because the buffer isn't large enough. */
1778 retval = 0;
1779 }
1780 else
1781 retval = convlen;
1782
1783 memcpy (s, convbuf, convlen);
1784 s[convlen] = '\0';
1785 g_free (convbuf);
1786
1787 return retval;
1788 }
1789
1790 #endif
1791
1792 gsize
1793 g_date_strftime (gchar *s,
1794 gsize slen,
1795 const gchar *format,
1796 const GDate *d)
1797 {
1798 struct tm tm;
1799 #ifndef G_OS_WIN32
1800 gsize locale_format_len = 0;
1801 gchar *locale_format;
1802 gsize tmplen;
1803 gchar *tmpbuf;
1804 gsize tmpbufsize;
1805 gsize convlen = 0;
1806 gchar *convbuf;
1807 GError *error = NULL;
1808 gsize retval;
1809 #endif
1810
1811 g_return_val_if_fail (g_date_valid (d), 0);
1812 g_return_val_if_fail (slen > 0, 0);
1813 g_return_val_if_fail (format != NULL, 0);
1814 g_return_val_if_fail (s != NULL, 0);
1815
1816 g_date_to_struct_tm (d, &tm);
1817
1818 #ifdef G_OS_WIN32
1819 if (!g_utf8_validate (format, -1, NULL))
1820 {
1821 s[0] = '\0';
1822 return 0;
1823 }
1824 return win32_strftime_helper (d, format, &tm, s, slen);
1825 #else
1826
1827 locale_format = g_locale_from_utf8 (format, -1, NULL, &locale_format_len, &error);
1828
1829 if (error)
1830 {
1831 g_warning (G_STRLOC "Error converting format to locale encoding: %s\n", error->message);
1832 g_error_free (error);
1833
1834 s[0] = '\0';
1835 return 0;
1836 }
1837
1838 tmpbufsize = MAX (128, locale_format_len * 2);
1839 while (TRUE)
1840 {
1841 tmpbuf = g_malloc (tmpbufsize);
1842
1843 /* Set the first byte to something other than '\0', to be able to
1844 * recognize whether strftime actually failed or just returned "".
1845 */
1846 tmpbuf[0] = '\1';
1847 tmplen = strftime (tmpbuf, tmpbufsize, locale_format, &tm);
1848
1849 if (tmplen == 0 && tmpbuf[0] != '\0')
1850 {
1851 g_free (tmpbuf);
1852 tmpbufsize *= 2;
1853
1854 if (tmpbufsize > 65536)
1855 {
1856 g_warning (G_STRLOC "Maximum buffer size for g_date_strftime exceeded: giving up\n");
1857 g_free (locale_format);
1858
1859 s[0] = '\0';
1860 return 0;
1861 }
1862 }
1863 else
1864 break;
1865 }
1866 g_free (locale_format);
1867
1868 convbuf = g_locale_to_utf8 (tmpbuf, tmplen, NULL, &convlen, &error);
1869 g_free (tmpbuf);
1870
1871 if (error)
1872 {
1873 g_warning (G_STRLOC "Error converting results of strftime to UTF-8: %s\n", error->message);
1874 g_error_free (error);
1875
1876 s[0] = '\0';
1877 return 0;
1878 }
1879
1880 if (slen <= convlen)
1881 {
1882 /* Ensure only whole characters are copied into the buffer.
1883 */
1884 gchar *end = g_utf8_find_prev_char (convbuf, convbuf + slen);
1885 g_assert (end != NULL);
1886 convlen = end - convbuf;
1887
1888 /* Return 0 because the buffer isn't large enough.
1889 */
1890 retval = 0;
1891 }
1892 else
1893 retval = convlen;
1894
1895 memcpy (s, convbuf, convlen);
1896 s[convlen] = '\0';
1897 g_free (convbuf);
1898
1899 return retval;
1900 #endif
1901 }
1902
1903 #define __G_DATE_C__
1904 #include "galiasdef.c"
1905
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