summaryrefslogtreecommitdiffstats
path: root/src/utils.c
blob: 1a480df83ed169058d9f0fc49442f90dbde3e3a1 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
/*
 * Calcurse - text-based organizer
 *
 * Copyright (c) 2004-2020 calcurse Development Team <misc@calcurse.org>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the
 *        following disclaimer in the documentation and/or other
 *        materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Send your feedback or comments to : misc@calcurse.org
 * Calcurse home page : http://calcurse.org
 *
 */

#include <time.h>
#include <stdarg.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <limits.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/wait.h>
#include <termios.h>

#include "calcurse.h"
#include "sha1.h"

#define FS_EXT_MAXLEN 64

enum format_specifier {
	FS_STARTDATE,
	FS_DURATION,
	FS_ENDDATE,
	FS_REMAINING,
	FS_MESSAGE,
	FS_NOTE,
	FS_NOTEFILE,
	FS_PRIORITY,
	FS_RAW,
	FS_HASH,
	FS_PSIGN,
	FS_EOF,
	FS_UNKNOWN
};

/* General routine to exit calcurse properly. */
void exit_calcurse(int status)
{
	int was_interactive;

	if (ui_mode == UI_CURSES) {
		notify_stop_main_thread();
		ui_calendar_stop_date_thread();
		io_stop_psave_thread();

		clear();
		wins_refresh();
		endwin();
		ui_mode = UI_CMDLINE;
		was_interactive = 1;
	} else {
		was_interactive = 0;
	}

	free_user_data();
	keys_free();
	mem_stats();

	if (was_interactive) {
		if (unlink(path_cpid) != 0)
			EXIT(_("Could not remove calcurse lock file: %s\n"),
			     strerror(errno));
		if (dmon.enable)
			dmon_start(status);
	}

	exit(status);
}

void free_user_data(void)
{
	unsigned i;

	day_free_vector();
	event_llist_free();
	apoint_llist_free();
	recur_apoint_llist_free();
	recur_event_llist_free();
	for (i = 0; i <= REG_BLACK_HOLE; i++)
		ui_day_item_cut_free(i);
	todo_free_list();
	notify_free_app();
}

/* Function to exit on internal error. */
void fatalbox(const char *errmsg)
{
	WINDOW *errwin;
	const char *label = _("/!\\ INTERNAL ERROR /!\\");
	const char *reportmsg = _("Please report the following bug:");
	const int WINROW = 10;
	const int WINCOL = col - 2;
	const int MSGLEN = WINCOL - 2;
	char msg[MSGLEN];

	if (errmsg == NULL)
		return;

	strncpy(msg, errmsg, MSGLEN);
	msg[MSGLEN - 1] = '\0';
	errwin =
	    newwin(WINROW, WINCOL, (row - WINROW) / 2, (col - WINCOL) / 2);
	custom_apply_attr(errwin, ATTR_HIGHEST);
	box(errwin, 0, 0);
	wins_show(errwin, label);
	mvwaddstr(errwin, 3, 1, reportmsg);
	mvwaddstr(errwin, 5, (WINCOL - strlen(msg)) / 2, msg);
	custom_remove_attr(errwin, ATTR_HIGHEST);
	wins_wrefresh(errwin);
	keys_wait_for_any_key(errwin);
	delwin(errwin);
	wins_doupdate();
}

void warnbox(const char *msg)
{
	WINDOW *warnwin;
	const char *label = "/!\\";
	const int WINROW = 10;
	const int WINCOL = col - 2;
	const int MSGLEN = WINCOL - 2;
	char displmsg[MSGLEN];

	if (msg == NULL)
		return;

	strncpy(displmsg, msg, MSGLEN);
	displmsg[MSGLEN - 1] = '\0';
	warnwin =
	    newwin(WINROW, WINCOL, (row - WINROW) / 2, (col - WINCOL) / 2);
	custom_apply_attr(warnwin, ATTR_HIGHEST);
	box(warnwin, 0, 0);
	wins_show(warnwin, label);
	mvwaddstr(warnwin, 5, (WINCOL - strlen(displmsg)) / 2, displmsg);
	custom_remove_attr(warnwin, ATTR_HIGHEST);
	wins_wrefresh(warnwin);
	keys_wait_for_any_key(warnwin);
	delwin(warnwin);
	wins_doupdate();
}

/*
 * Print a message in the status bar.
 * Message texts for first line and second line are to be provided.
 */
void status_mesg(const char *msg1, const char *msg2)
{
	wins_erase_status_bar();
	custom_apply_attr(win[STA].p, ATTR_HIGHEST);
	mvwaddstr(win[STA].p, 0, 0, msg1);
	mvwaddstr(win[STA].p, 1, 0, msg2);
	custom_remove_attr(win[STA].p, ATTR_HIGHEST);
	wins_wrefresh(win[STA].p);
}

/*
 * Prompts the user to make a choice between named alternatives.
 *
 * The available choices are described (in po-files) by a string of the form
 * "[ynp]". The first and last char are ignored (they are only here to
 * make the translators' life easier), and every other char indicates
 * a key the user is allowed to press.
 *
 * Returns the index of the key pressed by the user (starting from 1),
 * or -1 if the user doesn't want to answer (e.g. by escaping).
 */
int status_ask_choice(const char *message, const char choice[],
		      int nb_choice)
{
	/* Turn "[42w...Z]" into * "[4/2/w/.../Z]". */
	char avail_choice[nb_choice * UTF8_MAXLEN + nb_choice + 1];
	int ichoice[nb_choice];
	int i, j, k, n, ch;

	avail_choice[0] = '[';
	for (n = 0, i = 1, j = 1; n < nb_choice; n++, i += k) {
		for (k = 0; k < UTF8_LENGTH(choice[i]); k++) {
			avail_choice[j] = choice[i + k];
			j++;
		}
		avail_choice[j] = '/';
		j++;
	}
	avail_choice[j - 1] = ']';
	avail_choice[j] = '\0';

	status_mesg(message, avail_choice);

	/* Convert the character choices to internal integer codes. */
	for (n = 0, i = 1; n < nb_choice; n++, i += j) {
		j = UTF8_LENGTH(choice[i]);
		ichoice[n] = utf8_decode(choice + i) + (j > 1 ? KEY_MAX : 0);
	}

	for (;;) {
		ch = keys_wgetch(win[KEY].p);
		for (i = 0; i < nb_choice; i++)
			if (ch == ichoice[i])
				return i + 1;
		if (ch == ESCAPE)
			return (-1);
		if (ch == RETURN)
			return (-2);
		if (resize) {
			resize = 0;
			wins_reset();
			status_mesg(message, avail_choice);
		}
	}
}

/*
 * Prompts the user with a boolean question.
 *
 * Returns 1 if yes, 2 if no, and -1 otherwise
 */
int status_ask_bool(const char *msg)
{
	return (status_ask_choice(msg, _("[yn]"), 2));
}

/*
 * Prompts the user to make a choice between a number of alternatives.
 *
 * Returns the option chosen by the user (starting from 1), or -1 if
 * the user doesn't want to answer.
 */
int
status_ask_simplechoice(const char *prefix, const char *choice[],
			int nb_choice)
{
	int i;
	char *tmp;
	/* "(1) Choice1, (2) Choice2, (3) Choice3?" */
	char choicestr[BUFSIZ];
	/* Holds the characters to choose from ('1', '2', etc) */
	char char_choice[nb_choice + 2];

	/* No need to initialize first and last char. */
	for (i = 1; i <= nb_choice; i++)
		char_choice[i] = '0' + i;

	strcpy(choicestr, prefix);

	for (i = 0; i < nb_choice; i++) {
		asprintf(&tmp,
			 ((i + 1) == nb_choice) ? "(%d) %s?" : "(%d) %s, ",
			 (i + 1), choice[i]);
		strcat(choicestr, tmp);
		mem_free(tmp);
	}

	return (status_ask_choice(choicestr, char_choice, nb_choice));
}

/* Erase part of a window. */
void
erase_window_part(WINDOW * win, int first_col, int first_row, int last_col,
		  int last_row)
{
	int c, r;

	for (r = first_row; r <= last_row; r++) {
		for (c = first_col; c <= last_col; c++)
			mvwaddstr(win, r, c, " ");
	}
}

/* draws a popup window */
WINDOW *popup(int pop_row, int pop_col, int pop_y, int pop_x,
	      const char *title, const char *msg, int hint)
{
	const char *any_key = _("Press any key to continue...");
	WINDOW *popup_win;
	const int MSGXPOS = 5;

	popup_win = newwin(pop_row, pop_col, pop_y, pop_x);
	keypad(popup_win, TRUE);
	if (msg)
		mvwaddstr(popup_win, MSGXPOS, (pop_col - strlen(msg)) / 2,
			  msg);
	custom_apply_attr(popup_win, ATTR_HIGHEST);
	box(popup_win, 0, 0);
	wins_show(popup_win, title);
	if (hint)
		mvwaddstr(popup_win, pop_row - 2,
			  pop_col - (strlen(any_key) + 1), any_key);
	custom_remove_attr(popup_win, ATTR_HIGHEST);
	wins_wrefresh(popup_win);

	return popup_win;
}

/* prints in middle of a panel */
void
print_in_middle(WINDOW * win, int starty, int startx, int width,
		const char *string)
{
	int len = strlen(string);
	int x, y;

	win = win ? win : stdscr;
	getyx(win, y, x);
	x = startx ? startx : x;
	y = starty ? starty : y;
	width = width ? width : 80;

	x += (width - len) / 2;

	custom_apply_attr(win, ATTR_HIGHEST);
	mvwaddstr(win, y, x, string);
	custom_remove_attr(win, ATTR_HIGHEST);
}

/* checks if a string is only made of digits */
int is_all_digit(const char *string)
{
	for (; *string; string++) {
		if (!isdigit((int)*string))
			return 0;
	}

	return 1;
}

/* Given an item date expressed in seconds, return its start time in seconds. */
long get_item_time(time_t date)
{
	return (long)(get_item_hour(date) * HOURINSEC +
		      get_item_min(date) * MININSEC);
}

int get_item_hour(time_t date)
{
	struct tm lt;

	localtime_r(&date, &lt);
	return lt.tm_hour;
}

int get_item_min(time_t date)
{
	struct tm lt;

	localtime_r(&date, &lt);
	return lt.tm_min;
}

struct tm date2tm(struct date day, unsigned hour, unsigned min)
{
	time_t t = now();
	struct tm start;

	localtime_r(&t, &start);

	start.tm_mon = day.mm - 1;
	start.tm_mday = day.dd;
	start.tm_year = day.yyyy - 1900;
	start.tm_hour = hour;
	start.tm_min = min;
	start.tm_sec = 0;
	start.tm_isdst = -1;

	return start;
}

time_t date2sec(struct date day, unsigned hour, unsigned min)
{
	struct tm start = date2tm(day, hour, min);
	time_t t = mktime(&start);

	EXIT_IF(t == -1, _("failure in mktime"));

	return t;
}

/* Return the (calcurse) date of a (Unix) time in seconds. */
struct date sec2date(time_t t)
{
	struct tm tm;
	struct date d;

	localtime_r(&t, &tm);
	d.dd = tm.tm_mday;
	d.mm = tm.tm_mon + 1;
	d.yyyy = tm.tm_year + 1900;
	return d;
}

time_t tzdate2sec(struct date day, unsigned hour, unsigned min, char *tznew)
{
	char *tzold;
	time_t t;

	if (!tznew)
		return date2sec(day, hour, min);

	tzold = getenv("TZ");
	if (tzold)
		tzold = mem_strdup(tzold);
	setenv("TZ", tznew, 1);
	tzset();

	t = date2sec(day, hour, min);

	if (tzold) {
		setenv("TZ", tzold, 1);
		mem_free(tzold);
	} else {
	    unsetenv("TZ");
	}
	tzset();

	return t;
}

/* Compare two calcurse dates. */
int date_cmp(struct date *d1, struct date *d2)
{
	if (d1->yyyy < d2->yyyy)
		return -1;
	if (d1->yyyy > d2->yyyy)
		return 1;
	if (d1->mm < d2->mm)
		return -1;
	if (d1->mm > d2->mm)
		return 1;
	if (d1->dd < d2->dd)
		return -1;
	if (d1->dd > d2->dd)
		return 1;
	return 0;
}

/* Compare two dates (without comparing times). */
int date_cmp_day(time_t d1, time_t d2)
{
	struct tm lt1, lt2;

	localtime_r((time_t *)&d1, &lt1);
	localtime_r((time_t *)&d2, &lt2);

	if (lt1.tm_year < lt2.tm_year)
		return -1;
	if (lt1.tm_year > lt2.tm_year)
		return 1;
	if (lt1.tm_mon < lt2.tm_mon)
		return -1;
	if (lt1.tm_mon > lt2.tm_mon)
		return 1;
	if (lt1.tm_mday < lt2.tm_mday)
		return -1;
	if (lt1.tm_mday > lt2.tm_mday)
		return 1;

	return 0;
}

/* Generic function to format date. */
void date_sec2date_fmt(time_t sec, const char *fmt, char *datef)
{
#if ENABLE_NLS
	/* TODO: Find a better way to deal with localization and strftime(). */
	char *locale_old = mem_strdup(setlocale(LC_ALL, NULL));
	setlocale(LC_ALL, "C");
#endif

	struct tm lt;
	localtime_r(&sec, &lt);
	strftime(datef, BUFSIZ, fmt, &lt);

#if ENABLE_NLS
	setlocale(LC_ALL, locale_old);
	mem_free(locale_old);
#endif
}

/* Return a string containing the date, given a date in seconds. */
char *date_sec2date_str(time_t sec, const char *datefmt)
{
	char *datestr = (char *)mem_calloc(BUFSIZ, sizeof(char));
	date_sec2date_fmt(sec, datefmt, datestr);
	return datestr;
}

/*
 * Used to change date by adding a certain amount of days or months.
 * Returns 0 on success, 1 otherwise.
 */
int date_change(struct tm *date, int delta_month, int delta_day)
{
	struct tm t;

	t = *date;
	t.tm_mon += delta_month;
	t.tm_mday += delta_day;
	t.tm_isdst = -1;
	if (mktime(&t) == -1) {
		return 1;
	} else {
		t.tm_isdst = -1;
		*date = t;
		return 0;
	}
}

/*
 * Used to change date by adding a certain amount of days or months.
 */
time_t date_sec_change(time_t date, int delta_month, int delta_day)
{
	struct tm lt;
	time_t t;

	t = date;
	localtime_r(&t, &lt);
	lt.tm_mon += delta_month;
	lt.tm_mday += delta_day;
	lt.tm_isdst = -1;
	t = mktime(&lt);
	EXIT_IF(t == -1, _("failure in mktime"));

	return t;
}

/*
 * A date in seconds is updated with new day, month and year and returned.
 */
static time_t update_date_in_date(time_t date, int day, int month, int year)
{
	struct tm lt;

	localtime_r(&date, &lt);
	lt.tm_mday = day;
	lt.tm_mon = month - 1;
	lt.tm_year = year - 1900;
	lt.tm_isdst = -1;
	date = mktime(&lt);
	EXIT_IF(date == -1, _("error in mktime"));

	return date;
}

/*
 * A date in seconds is updated with new hour and minutes and returned.
 */
time_t update_time_in_date(time_t date, unsigned hr, unsigned mn)
{
	struct tm lt;

	localtime_r(&date, &lt);
	lt.tm_hour = hr;
	lt.tm_min = mn;
	lt.tm_sec = 0;
	lt.tm_isdst = -1;
	date = mktime(&lt);
	EXIT_IF(date == -1, _("error in mktime"));

	return date;
}

/*
 * Returns the date in seconds from year 1970.
 * If no date is entered, current date is chosen.
 */
time_t get_sec_date(struct date date)
{
	struct tm ptrtime;
	time_t timer;
	char current_day[] = "dd ";
	char current_month[] = "mm ";
	char current_year[] = "yyyy ";

	if (date.yyyy == 0 && date.mm == 0 && date.dd == 0) {
		timer = time(NULL);
		localtime_r(&timer, &ptrtime);
		strftime(current_day, strlen(current_day), "%d", &ptrtime);
		strftime(current_month, strlen(current_month), "%m", &ptrtime);
		strftime(current_year, strlen(current_year), "%Y", &ptrtime);
		date.mm = atoi(current_month);
		date.dd = atoi(current_day);
		date.yyyy = atoi(current_year);
	}

	return date2sec(date, 0, 0);
}

long min2sec(unsigned minutes)
{
	return minutes * MININSEC;
}

/*
 * Display a scroll bar when there are so many items that they
 * can not be displayed inside the corresponding panel.
 * Leave it out in the appointments panel in when multiple days mode.
 */
void draw_scrollbar(struct scrollwin *sw, int hilt)
{
	if (sw == &lb_apt.sw && conf.multiple_days)
		return;

	int y = (conf.compact_panels ? 1 : 3);
	int h = sw->h - (conf.compact_panels ? 2 : 4);

	int sbar_h = MAX(h * h / sw->line_num, 1);
	int sbar_y = y + sw->line_off * (h - sbar_h) / (sw->line_num - h);
	int sbar_x = sw->w - 1;

	/* Redraw part of the border. */
	if (hilt)
		custom_apply_attr(sw->win, ATTR_HIGHEST);
	mvwvline(sw->win, y, sbar_x, ACS_VLINE, h);
	if (hilt)
		custom_remove_attr(sw->win, ATTR_HIGHEST);

	/* Draw the scrollbar. */
	if (hilt)
		custom_apply_attr(sw->win, ATTR_HIGHEST);
	wattron(sw->win, A_REVERSE);
	mvwvline(sw->win, sbar_y, sbar_x, ' ', sbar_h);
	wattroff(sw->win, A_REVERSE);
	if (hilt)
		custom_remove_attr(sw->win, ATTR_HIGHEST);
}

/*
 * Print an item (either an appointment, event, or todo) in a
 * popup window. This is useful if an item description is too
 * long to fit in its corresponding panel window.
 */
void
item_in_popup(const char *a_start, const char *a_end, const char *msg,
	      const char *pop_title)
{
	WINDOW *popup_win, *pad;
	const int margin_left = 4, margin_top = 4;
	const int winl = row - 5, winw = col - margin_left;
	const int padl = winl - 2, padw = winw - margin_left;

	pad = newpad(padl, padw);
	popup_win = popup(winl, winw, 1, 2, pop_title, NULL, 1);
	if (a_start && a_end) {
		mvwprintw(popup_win, margin_top, margin_left, "- %s -> %s",
			  a_start, a_end);
	}
	mvwaddstr(pad, 0, margin_left, msg);
	wmove(win[STA].p, 0, 0);
	pnoutrefresh(pad, 0, 0, margin_top + 2, margin_left, padl, winw);
	wins_doupdate();
	keys_wait_for_any_key(popup_win);
	delwin(pad);
	delwin(popup_win);
}

/* Returns the beginning of current day in seconds from 1970. */
time_t get_today(void)
{
	struct tm lt;
	time_t current_time;
	struct date day;

	current_time = time(NULL);
	localtime_r(&current_time, &lt);
	day.mm = lt.tm_mon + 1;
	day.dd = lt.tm_mday;
	day.yyyy = lt.tm_year + 1900;

	return date2sec(day, 0, 0);
}

/* Returns the beginning of the selected day in the calendar. */
time_t get_slctd_day(void)
{
	return date2sec(*ui_calendar_get_slctd_day(), 0, 0);
}

/* Returns the current time in seconds. */
time_t now(void)
{
	return time(NULL);
}

char *nowstr(void)
{
	struct tm lt;
	static char buf[BUFSIZ];
	time_t t = now();

	localtime_r(&t, &lt);
	strftime(buf, sizeof buf, "%a %b %d %T %Y", &lt);

	return buf;
}

/* Print the given option value with appropriate color. */
void
print_bool_option_incolor(WINDOW * win, unsigned option, int pos_y,
			  int pos_x)
{
	int color = 0;
	const char *option_value;

	if (option == 1) {
		color = ATTR_TRUE;
		option_value = _("yes");
	} else if (option == 0) {
		color = ATTR_FALSE;
		option_value = _("no");
	} else {
		EXIT(_("option not defined"));
	}

	/*
	 * Possibly nested custom_apply_attr() calls. Turn
	 * custom_apply_attr(ATTR_HIGHEST) off explicitly,
	 * while it may have other attributes besides the colour.
	 */
	custom_remove_attr(win, ATTR_HIGHEST);
	custom_apply_attr(win, color);
	mvwaddstr(win, pos_y, pos_x, option_value);
	custom_remove_attr(win, color);
	wnoutrefresh(win);
	wins_doupdate();
}

/*
 * Get the name of the default directory for temporary files.
 */
const char *get_tempdir(void)
{
	if (getenv("TMPDIR"))
		return getenv("TMPDIR");
#ifdef P_tmpdir
	else if (P_tmpdir)
		return P_tmpdir;
#endif
	else
		return "/tmp";
}

/*
 * Create a new unique file, and return a newly allocated string which contains
 * the random part of the file name.
 */
char *new_tempfile(const char *prefix)
{
	char *fullname;
	int fd;
	FILE *file;

	if (prefix == NULL)
		return NULL;

	asprintf(&fullname, "%s.XXXXXX", prefix);
	if ((fd = mkstemp(fullname)) == -1
	    || (file = fdopen(fd, "w+")) == NULL) {
		if (fd != -1) {
			unlink(fullname);
			close(fd);
		}
		ERROR_MSG(_("temporary file \"%s\" could not be created"),
			  fullname);

		mem_free(fullname);
		return NULL;
	}
	fclose(file);

	return fullname;
}

static void get_ymd(int *year, int *month, int *day, time_t t)
{
	struct tm tm;

	localtime_r(&t, &tm);
	*day = tm.tm_mday;
	*month = tm.tm_mon + 1;
	*year = tm.tm_year + 1900;
}

static void get_weekday_ymd(int *year, int *month, int *day, int weekday)
{
	time_t t = get_today();
	struct tm tm;
	int delta;

	localtime_r(&t, &tm);
	delta = weekday - tm.tm_wday;
	t = date_sec_change(t, 0, delta > 0 ? delta : 7);

	localtime_r(&t, &tm);
	*day = tm.tm_mday;
	*month = tm.tm_mon + 1;
	*year = tm.tm_year + 1900;
}

/*
 * Check if a calcurse date is valid.
 */
int check_date(unsigned year, unsigned month, unsigned day)
{
	return ((YEAR1902_2037 ? year >= 1902 && year <= 2037 : 1) &&
		month >= 1 && month <= 12 &&
		day >= 1 &&
		day <= days[month - 1] + (month == 2 && ISLEAP(year)) ? 1 : 0);
}

/*
 * Check that a time in seconds is a valid calcurse date (ignoring hour:min:sec).
 */
int check_sec(time_t *time)
{
	struct tm tm;
	localtime_r(time, &tm);
	return check_date(tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
}

/*
 * Convert a string containing a date into three integers containing the year,
 * month and day.
 *
 * If a pointer to a date structure containing the current date is passed as
 * last parameter ("slctd_date"), the function will accept several short forms,
 * e.g. "26" for the 26th of the current month/year or "3/1" for Mar 01 (or Jan
 * 03, depending on the date format) of the current year. If a null pointer is
 * passed, short forms won't be accepted at all.
 *
 * Returns 1 if sucessfully converted or 0 if the string is an invalid date.
 */
int
parse_date(const char *date_string, enum datefmt datefmt, int *year,
	   int *month, int *day, struct date *slctd_date)
{
	const char sep = (datefmt == DATEFMT_ISO) ? '-' : '/';
	const char *p;
	int in[3] = { 0, 0, 0 }, n = 0;
	int d, m, y;

	if (!date_string)
		return 0;

	if (!strcasecmp(date_string, "today")) {
		get_ymd(year, month, day, get_today());
		return 1;
	} else if (!strcasecmp(date_string, "yesterday")) {
		get_ymd(year, month, day, date_sec_change(get_today(), 0, -1));
		return 1;
	} else if (!strcasecmp(date_string, "tomorrow")) {
		get_ymd(year, month, day, date_sec_change(get_today(), 0, 1));
		return 1;
	} else if (!strcasecmp(date_string, "now")) {
		get_ymd(year, month, day, now());
		return 1;
	} else if (!strcasecmp(date_string, "sunday") ||
		   !strcasecmp(date_string, "sun")) {
		get_weekday_ymd(year, month, day, 0);
		return 1;
	} else if (!strcasecmp(date_string, "monday") ||
		   !strcasecmp(date_string, "mon")) {
		get_weekday_ymd(year, month, day, 1);
		return 1;
	} else if (!strcasecmp(date_string, "tuesday") ||
		   !strcasecmp(date_string, "tue")) {
		get_weekday_ymd(year, month, day, 2);
		return 1;
	} else if (!strcasecmp(date_string, "wednesday") ||
		   !strcasecmp(date_string, "wed")) {
		get_weekday_ymd(year, month, day, 3);
		return 1;
	} else if (!strcasecmp(date_string, "thursday") ||
		   !strcasecmp(date_string, "thu")) {
		get_weekday_ymd(year, month, day, 4);
		return 1;
	} else if (!strcasecmp(date_string, "friday") ||
		   !strcasecmp(date_string, "fri")) {
		get_weekday_ymd(year, month, day, 5);
		return 1;
	} else if (!strcasecmp(date_string, "saturday") ||
		   !strcasecmp(date_string, "sat")) {
		get_weekday_ymd(year, month, day, 6);
		return 1;
	}

	/* parse string into in[], read up to three integers */
	for (p = date_string; *p; p++) {
		if (*p == sep) {
			if ((++n) > 2)
				return 0;
		} else if ((*p >= '0') && (*p <= '9')) {
			in[n] = in[n] * 10 + (int)(*p - '0');
		} else {
			return 0;
		}
	}

	if ((!slctd_date && n < 2) || in[n] == 0)
		return 0;

	/* convert into day, month and year, depending on the date format */
	switch (datefmt) {
	case DATEFMT_MMDDYYYY:
		m = (n >= 1) ? in[0] : 0;
		d = (n >= 1) ? in[1] : in[0];
		y = in[2];
		break;
	case DATEFMT_DDMMYYYY:
		d = in[0];
		m = in[1];
		y = in[2];
		break;
	case DATEFMT_YYYYMMDD:
	case DATEFMT_ISO:
		y = (n >= 2) ? in[n - 2] : 0;
		m = (n >= 1) ? in[n - 1] : 0;
		d = in[n];
		break;
	default:
		return 0;
	}

	if (slctd_date) {
		if (y > 0 && y < 100) {
			/* convert "YY" format into "YYYY" */
			y += slctd_date->yyyy - slctd_date->yyyy % 100;
		} else if (n < 2) {
			/* set year and, optionally, month if short from is used */
			y = slctd_date->yyyy;
			if (n < 1)
				m = slctd_date->mm;
		}
	}

	/* check if date is valid, take leap years into account */
	if (!check_date(y, m, d))
		return 0;

	if (year)
		*year = y;
	if (month)
		*month = m;
	if (day)
		*day = d;

	return 1;
}

int
parse_date_interactive(const char *datestr, int *year, int *month, int *day)
{
	return parse_date(datestr, conf.input_datefmt, year, month, day,
			  ui_calendar_get_slctd_day());
}

/*
 * Convert a date increment string into a number of days.
 * If start is non-zero, the final end time is validated.
 *
 * Allowed formats in lenient BNF:
 * <increment>::= <days> | <period>
 * <period>   ::= [ <weeks>w ][ <days>d ]
 * Notes:
 *            <days> and <weeks> are any integer >= 0.
 *            <period> must have at least one non-terminal.
 *
 * Returns 1 on success and 0 on failure.
 */
int parse_date_increment(const char *string, unsigned *days, time_t start)
{
	enum {
		STATE_INITIAL,
		STATE_WWDD_DD,
		STATE_DONE
	} state = STATE_INITIAL;

	const char *p;
	unsigned in = 0, frac = 0, denom = 1;
	unsigned incr = 0;

	if (!string || *string == '\0')
		return 0;

	/* parse string using a simple state machine */
	for (p = string; *p; p++) {
		if (state == STATE_DONE) {
			return 0;
		} else if ((*p >= '0') && (*p <= '9')) {
			in = in * 10 + (int)(*p - '0');
			if (frac)
				denom *= 10;
		} else if (*p == '.') {
			if (frac)
				return 0;
			frac++;
		} else {
			switch (state) {
			case STATE_INITIAL:
				if (*p == 'w') {
					incr += in * WEEKINDAYS / denom;
					state = STATE_WWDD_DD;
				} else if (*p == 'd') {
					incr += in / denom;
					state = STATE_DONE;
				} else {
					return 0;
				}
				break;
			case STATE_WWDD_DD:
				if (*p == 'd') {
					incr += in / denom;
					state = STATE_DONE;
				} else {
					return 0;
				}
				break;
			default:
				break;
			}

			in = frac = 0;
			denom = 1;
		}
	}
	if (state == STATE_DONE && in > 0)
		return 0;
	incr += in;
	if (start) {
		/* wanted: start = start + incr * DAYINSEC */
		long p;
		if (overflow_mul(incr, DAYINSEC, &p))
			return 0;
		if (overflow_add(start, p, &start))
			return 0;
		if (!check_sec(&start))
			return 0;
	}
	*days = incr;
	return 1;
}

/*
 * Check if time is valid.
 */
int check_time(unsigned hours, unsigned minutes)
{
	return (hours < DAYINHOURS && minutes < HOURINMIN);
}

/*
 * Converts a time string into hours and minutes. Short forms like "23:"
 * (23:00) or ":45" (0:45) are allowed as well as "2345". Note: the latter
 * clashes with date formats 0001 .. 0031 and must be picked up before
 * dates when parsing in parse_datetime.
 *
 * Returns 1 on success and 0 on failure.
 */
int parse_time(const char *string, unsigned *hour, unsigned *minute)
{
	const char *p;
	unsigned in[2] = { 0, 0 }, n = 0;

	if (!string)
		return 0;

	/* parse string into in[], read up to two integers */
	for (p = string; *p; p++) {
		if (*p == ':') {
			if ((++n) > 1)
				return 0;
		} else if (isdigit(*p)) {
			in[n] = in[n] * 10 + *p - '0';
		} else {
			return 0;
		}
	}
	/* 24-hour format without ':' (hhmm)? */
	if (n == 0 && strlen(string) == 4) {
		in[1] = in[0] % 100;
		in[0] = in[0] / 100;
		n = 1;
	}

	if (n != 1 || !check_time(in[0], in[1]))
		return 0;

	*hour = in[0];
	*minute = in[1];
	return 1;
}

/*
 * Converts a duration string into minutes.
 * If start time is non-zero, the final end time is validated.
 *
 * Allowed formats in lenient BNF:
 * <duration> ::= <minutes> | <time> | <period>
 * <time>     ::= <hours>:<min>
 * <period>   ::= [ <days>d ][ <hours>h ][ <minutes>m ]
 * <min>      ::= integer in the range 0-59
 * Notes:
 *            <days>, <hours> and <minutes> are any sequence of
 *	      the characters 1,2,..,9,0.
 *            <period> must have at least one non-terminal.
 *
 * Returns 1 on success and 0 on failure.
 */
int parse_duration(const char *string, unsigned *duration, time_t start)
{
	enum {
		STATE_INITIAL,
		STATE_HHMM_MM,
		STATE_DDHHMM_HH,
		STATE_DDHHMM_MM,
		STATE_DONE
	} state = STATE_INITIAL;

	const char *p;
	unsigned in = 0, frac = 0, denom = 1;
	long dur = 0;

	if (!string || *string == '\0')
		return 0;

	/* parse string using a simple state machine */
	for (p = string; *p; p++) {
		if (state == STATE_DONE) {
			return 0;
		} else if ((*p >= '0') && (*p <= '9')) {
			in = in * 10 + (int)(*p - '0');
			if (frac)
				denom *= 10;
		} else if (*p == '.') {
			if (frac)
				return 0;
			frac++;
		} else {
			switch (state) {
			case STATE_INITIAL:
				if (*p == ':') {
					dur += in * HOURINMIN / denom;
					state = STATE_HHMM_MM;
				} else if (*p == 'd') {
					dur += in * DAYINMIN / denom;
					state = STATE_DDHHMM_HH;
				} else if (*p == 'h') {
					dur += in * HOURINMIN / denom;
					state = STATE_DDHHMM_MM;
				} else if (*p == 'm') {
					dur += in / denom;
					state = STATE_DONE;
				} else {
					return 0;
				}
				break;
			case STATE_DDHHMM_HH:
				if (*p == 'h') {
					dur += in * HOURINMIN / denom;
					state = STATE_DDHHMM_MM;
				} else if (*p == 'm') {
					dur += in / denom;
					state = STATE_DONE;
				} else {
					return 0;
				}
				break;
			case STATE_DDHHMM_MM:
				if (*p == 'm') {
					dur += in / denom;
					state = STATE_DONE;
				} else {
					return 0;
				}
				break;
			case STATE_HHMM_MM:
				return 0;
			default:
				break;
			}

			in = frac = 0;
			denom = 1;
		}
	}
	if ((state == STATE_HHMM_MM && in >= HOURINMIN) ||
	    ((state == STATE_DDHHMM_HH || state == STATE_DDHHMM_MM) && in > 0))
		return 0;
	dur += in;
	if (start) {
		/* wanted: end = start + dur * MININSEC */
		time_t end;
		long p, s;
		if (overflow_mul(dur, MININSEC, &p))
			return 0;
		if (overflow_add(start, p, &s))
			return 0;
		end = s;
		if (!check_sec(&end) || end < start)
			return 0;
	}
	*duration = dur;
	return 1;
}

/*
 * Converts a string containing a date or a time into a time stamp.
 *
 * Takes a date/time string and a time stamp. If the string only contains a
 * date, the date of the time stamp is updated while the time remains
 * untouched. If the string only contains a time, the time of the time stamp is
 * updated and the date remains the same. If the string contains both a date
 * and a time, the time stamp is updated to match the given string.
 *
 * The final time is validated. In addition, if a positive duration is given,
 * time + duration validated (zero duration needs no validation).
 *
 * Returns a positive value on success and 0 on failure. The least-significant
 * bit is set if the date was updated. Bit 1 is set if the time was updated.
 */
int parse_datetime(const char *string, time_t *ts, time_t dur)
{
	unsigned hour, minute;
	int year, month, day;
	int ret = 0;

	char *d = mem_strdup(string);
	/* Split into date and time, if possible. */
	char *t = strchr(d, ' ');
	if (t)
		*t++ = '\0';
	if (t) {
		if (parse_date_interactive(d, &year, &month, &day) &&
	            parse_time(t, &hour, &minute)) {
			ret |= PARSE_DATETIME_HAS_DATE |
			       PARSE_DATETIME_HAS_TIME;
		}
	/* Time before date, see comments in parse_time(). */
	} else if (parse_time(d, &hour, &minute)) {
		ret |= PARSE_DATETIME_HAS_TIME;
	} else if (parse_date_interactive(d, &year, &month, &day)) {
		ret |= PARSE_DATETIME_HAS_DATE;
	}
	if (ret & PARSE_DATETIME_HAS_DATE)
		*ts = update_date_in_date(*ts, day, month, year);
	if (ret & PARSE_DATETIME_HAS_TIME)
		*ts = update_time_in_date(*ts, hour, minute);
	mem_free(d);

	/* Is the resulting time a valid (start or end) time? */
	if (!check_sec(ts))
		return 0;
	/* Is the resulting time + dur a valid end time? */
	if (dur) {
		/* want: sec = *ts + dur */
		time_t sec;
		if (overflow_add(*ts, dur, &sec))
			return 0;
		if (!check_sec(&sec))
			return 0;
	}
	return ret;
}

void file_close(FILE * f, const char *pos)
{
	EXIT_IF((fclose(f)) != 0, _("Error when closing file at %s"), pos);
}

/*
 * Sleep the given number of seconds, but make it more 'precise' than sleep(3)
 * (hence the 'p') in a way that even if a signal is caught during the sleep
 * process, this function will return to sleep afterwards.
 */
void psleep(unsigned secs)
{
	unsigned unslept;

	for (unslept = sleep(secs); unslept; unslept = sleep(unslept)) ;
}

/*
 * Fork and execute an external process.
 *
 * If pfdin/pfdout/pfderr point to a valid address, a pipe is created and the
 * appropriate file descriptors are written to pfdin/pfdout/pfderr.
 *
 * If new_session is non-zero, setsid() is called after forking.
 */
int fork_exec(int *pfdin, int *pfdout, int *pfderr, int new_session,
              const char *path, const char *const *arg)
{
	int pin[2], pout[2], perr[2];
	int pid;

	if (pfdin && (pipe(pin) == -1))
		return 0;
	if (pfdout && (pipe(pout) == -1))
		return 0;
	if (pfderr && (pipe(perr) == -1))
		return 0;

	if ((pid = fork()) == 0) {
		if (pfderr) {
			if (dup2(perr[0], STDERR_FILENO) < 0)
				_exit(127);
			close(perr[0]);
			close(perr[1]);
		}

		if (pfdout) {
			if (dup2(pout[0], STDIN_FILENO) < 0)
				_exit(127);
			close(pout[0]);
			close(pout[1]);
		}

		if (pfdin) {
			if (dup2(pin[1], STDOUT_FILENO) < 0)
				_exit(127);
			close(pin[0]);
			close(pin[1]);
		}

		if (new_session) {
			if ((setsid() < 0))
				_exit(127);
		}

		execvp(path, (char *const *)arg);
		_exit(127);
	} else {
		if (pfdin)
			close(pin[1]);
		if (pfdout)
			close(pout[0]);
		if (pfderr)
			close(perr[0]);

		if (pid > 0) {
			if (pfdin) {
				fcntl(pin[0], F_SETFD, FD_CLOEXEC);
				*pfdin = pin[0];
			}
			if (pfdout) {
				fcntl(pout[1], F_SETFD, FD_CLOEXEC);
				*pfdout = pout[1];
			}
			if (pfderr) {
				fcntl(perr[1], F_SETFD, FD_CLOEXEC);
				*pfderr = perr[1];
			}
		} else {
			if (pfdin)
				close(pin[0]);
			if (pfdout)
				close(pout[1]);
			if (pfderr)
				close(perr[1]);
			return 0;
		}
	}
	return pid;
}

/* Execute an external program in a shell. */
int
shell_exec(int *pfdin, int *pfdout, int *pfderr, int new_session,
           const char *path, const char *const *arg)
{
	int argc, i;
	const char **narg;
	char *arg0 = NULL;
	int ret;

	for (argc = 0; arg[argc]; argc++) ;

	if (argc < 1)
		return -1;

	narg = mem_calloc(argc + 4, sizeof(const char *));

	narg[0] = "sh";
	narg[1] = "-c";

	if (argc > 1) {
		asprintf(&arg0, "%s \"$@\"", path);
		narg[2] = arg0;

		for (i = 0; i < argc; i++)
			narg[i + 3] = arg[i];
		narg[argc + 3] = NULL;
	} else {
		narg[2] = path;
		narg[3] = NULL;
	}

	ret = fork_exec(pfdin, pfdout, pfderr, new_session, *narg, narg);

	if (arg0)
		mem_free(arg0);
	mem_free(narg);

	return ret;
}

/* Wait for a child process to terminate. */
int child_wait(int *pfdin, int *pfdout, int *pfderr, int pid)
{
	int stat;

	if (pfdin)
		close(*pfdin);
	if (pfdout)
		close(*pfdout);
	if (pfderr)
		close(*pfderr);

	if (waitpid(pid, &stat, 0) == pid)
		return stat;
	else
		return -1;
}

/* Display "Press any key to continue..." and wait for a key press. */
void press_any_key(void)
{
	struct termios t_attr_old, t_attr;

	tcgetattr(STDIN_FILENO, &t_attr_old);
	memcpy(&t_attr, &t_attr_old, sizeof(struct termios));
	t_attr.c_lflag &= ~(ICANON | ECHO | ECHONL);
	tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_attr);

	fflush(stdout);
	fputs(_("Press any key to continue..."), stdout);
	fflush(stdout);
	fgetc(stdin);
	fflush(stdin);
	fputs("\r\n", stdout);

	tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_attr_old);
}

/*
 * Display note contents if one is asociated with the currently displayed item
 * (to be used together with the '-a' or '-t' flag in non-interactive mode).
 * Each line begins with nbtab tabs.
 * Print "No note file found", if the notefile does not exists.
 *
 * (patch submitted by Erik Saule).
 */
static void print_notefile(FILE * out, const char *filename, int nbtab)
{
	char *path_to_notefile;
	FILE *notefile;
	char linestarter[BUFSIZ];
	char buffer[BUFSIZ];
	int i;
	int printlinestarter = 1;

	if (nbtab < BUFSIZ) {
		for (i = 0; i < nbtab; i++)
			linestarter[i] = '\t';
		linestarter[nbtab] = '\0';
	} else {
		linestarter[0] = '\0';
	}

	asprintf(&path_to_notefile, "%s/%s", path_notes, filename);
	notefile = fopen(path_to_notefile, "r");
	mem_free(path_to_notefile);
	if (notefile) {
		while (fgets(buffer, BUFSIZ, notefile) != 0) {
			if (printlinestarter) {
				fputs(linestarter, out);
				printlinestarter = 0;
			}
			fputs(buffer, out);
			if (buffer[strlen(buffer) - 1] == '\n')
				printlinestarter = 1;
		}
		fputs("\n", out);
		file_close(notefile, __FILE_POS__);
	} else {
		fputs(linestarter, out);
		fputs(_("No note file found\n"), out);
	}
}

/* Print an escape sequence and return its length. */
static int print_escape(const char *s)
{
	switch (*(s + 1)) {
	case 'a':
		putchar('\a');
		return 1;
	case 'b':
		putchar('\b');
		return 1;
	case 'f':
		putchar('\f');
		return 1;
	case 'n':
		putchar('\n');
		return 1;
	case 'r':
		putchar('\r');
		return 1;
	case 't':
		putchar('\t');
		return 1;
	case 'v':
		putchar('\v');
		return 1;
	case '0':
		putchar('\0');
		return 1;
	case '\'':
		putchar('\'');
		return 1;
	case '"':
		putchar('"');
		return 1;
	case '\?':
		putchar('?');
		return 1;
	case '\\':
		putchar('\\');
		return 1;
	case '\0':
		return 0;
	default:
		return 1;
	}
}

/* Parse a format specifier. */
static enum format_specifier parse_fs(const char **s, char *extformat)
{
	char buf[FS_EXT_MAXLEN];
	int i;

	extformat[0] = '\0';

	switch (**s) {
	case 's':
		strcpy(extformat, "epoch");
		return FS_STARTDATE;
	case 'S':
		return FS_STARTDATE;
	case 'd':
		return FS_DURATION;
	case 'e':
		strcpy(extformat, "epoch");
		return FS_ENDDATE;
	case 'E':
		return FS_ENDDATE;
	case 'm':
		return FS_MESSAGE;
	case 'n':
		return FS_NOTE;
	case 'N':
		return FS_NOTEFILE;
	case 'p':
		return FS_PRIORITY;
	case 'r':
		return FS_REMAINING;
	case '(':
		/* Long format specifier. */
		for ((*s)++, i = 0; **s != ':' && **s != ')'; (*s)++, i++) {
			if (**s == '\0')
				return FS_EOF;

			if (i < FS_EXT_MAXLEN)
				buf[i] = **s;
		}

		buf[(i < FS_EXT_MAXLEN) ? i : FS_EXT_MAXLEN - 1] = '\0';

		if (**s == ':') {
			for ((*s)++, i = 0; **s != ')'; (*s)++, i++) {
				if (**s == '\0')
					return FS_EOF;

				if (i < FS_EXT_MAXLEN)
					extformat[i] = **s;
			}

			extformat[(i <
				   FS_EXT_MAXLEN) ? i : FS_EXT_MAXLEN -
				  1] = '\0';
		}

		if (!strcmp(buf, "start"))
			return FS_STARTDATE;
		else if (!strcmp(buf, "duration"))
			return FS_DURATION;
		else if (!strcmp(buf, "end"))
			return FS_ENDDATE;
		else if (!strcmp(buf, "remaining"))
			return FS_REMAINING;
		else if (!strcmp(buf, "message"))
			return FS_MESSAGE;
		else if (!strcmp(buf, "noteid"))
			return FS_NOTE;
		else if (!strcmp(buf, "note"))
			return FS_NOTEFILE;
		else if (!strcmp(buf, "priority"))
			return FS_PRIORITY;
		else if (!strcmp(buf, "raw"))
			return FS_RAW;
		else if (!strcmp(buf, "hash"))
			return FS_HASH;
		else
			return FS_UNKNOWN;
	case '%':
		return FS_PSIGN;
	case '\0':
		return FS_EOF;
	default:
		return FS_UNKNOWN;
	}
}

/*
 * Print date to stdout, formatted to be displayed for day.
 * The "day" argument may be any time belonging to that day.
 */
static void print_date(time_t date, time_t day, const char *extformat)
{
	char buf[BUFSIZ];

	if (!strcmp(extformat, "epoch")) {
		printf("%ld", (long)date);
	} else {
		time_t day_start = DAY(day);
		time_t day_end = date_sec_change(day_start, 0, 1);
		struct tm lt;

		localtime_r((time_t *) &date, &lt);

		if (extformat[0] == '\0' || !strcmp(extformat, "default")) {
			if (date >= day_start && date <= day_end)
				strftime(buf, BUFSIZ, "%H:%M", &lt);
			else
				strftime(buf, BUFSIZ, "..:..", &lt);
		} else {
			strftime(buf, BUFSIZ, extformat, &lt);
		}

		printf("%s", buf);
	}
}

/* Print a time difference to stdout. */
static void print_datediff(long difference, const char *extformat)
{
	const char *p;
	const char *numfmt;
	bool usetotal;
	long value;

	if (!strcmp(extformat, "epoch")) {
		printf("%ld", difference);
	} else {
		if (extformat[0] == '\0' || !strcmp(extformat, "default")) {
			/* Set a default format if none specified. */
			p = "%EH:%M";
		} else {
			p = extformat;
		}
		while (*p) {
			if (*p == '%') {
				p++;
				/* Default is to zero-pad, and assume
				 * the user wants the time unit modulo
				 * the next biggest time unit. */
				numfmt = "%02d";
				usetotal = FALSE;
				if (*p == '-') {
					numfmt = "%d";
					p++;
				}
				if (*p == 'E') {
					usetotal = TRUE;
					p++;
				}
				switch (*p) {
				case '\0':
					return;
				case 'd':
					value = difference / DAYINSEC;
					printf(numfmt, value);
					break;
				case 'H':
					value = difference / HOURINSEC;
					if (!usetotal)
						value %= DAYINHOURS;
					printf(numfmt, value);
					break;
				case 'M':
					value = difference / MININSEC;
					if (!usetotal)
						value %= HOURINMIN;
					printf(numfmt, value);
					break;
				case 'S':
					value = difference;
					if (!usetotal)
						value %= MININSEC;
					printf(numfmt, value);
					break;
				case '%':
					putchar('%');
					break;
				default:
					putchar('?');
					break;
				}
			} else {
				putchar(*p);
			}
			p++;
		}
	}
}

/* Print a formatted appointment to stdout. */
static void print_apoint_helper(const char *format, time_t day,
				struct apoint *apt, struct recur_apoint *rapt)
{
	const char *p;
	char extformat[FS_EXT_MAXLEN];

	for (p = format; *p; p++) {
		if (*p == '%') {
			p++;
			switch (parse_fs(&p, extformat)) {
			case FS_STARTDATE:
				print_date(apt->start, day, extformat);
				break;
			case FS_DURATION:
				/* Backwards compatibility: Use epoch by
				 * default. */
				if (*extformat == '\0')
					strcpy(extformat, "epoch");
				print_datediff(apt->dur, extformat);
				break;
			case FS_ENDDATE:
				print_date(apt->start + apt->dur, day,
					   extformat);
				break;
			case FS_REMAINING:
				print_datediff(difftime(apt->start, now()),
				               extformat);
				break;
			case FS_MESSAGE:
				printf("%s", apt->mesg);
				break;
			case FS_NOTE:
				printf("%s", apt->note);
				break;
			case FS_NOTEFILE:
				print_notefile(stdout, apt->note, 1);
				break;
			case FS_RAW:
				if (rapt)
					recur_apoint_write(rapt, stdout);
				else
					apoint_write(apt, stdout);
				break;
			case FS_HASH:
				if (rapt)
					printf("%s", recur_apoint_hash(rapt));
				else
					printf("%s", apoint_hash(apt));
				break;
			case FS_PSIGN:
				putchar('%');
				break;
			case FS_EOF:
				return;
				break;
			default:
				putchar('?');
				break;
			}
		} else if (*p == '\\') {
			p += print_escape(p);
		} else {
			putchar(*p);
		}
	}
}

/* Print a formatted event to stdout. */
static void print_event_helper(const char *format, time_t day, struct event *ev,
			       struct recur_event *rev)
{
	const char *p;
	char extformat[FS_EXT_MAXLEN];

	for (p = format; *p; p++) {
		if (*p == '%') {
			p++;
			switch (parse_fs(&p, extformat)) {
			case FS_MESSAGE:
				printf("%s", ev->mesg);
				break;
			case FS_NOTE:
				printf("%s", ev->note);
				break;
			case FS_NOTEFILE:
				print_notefile(stdout, ev->note, 1);
				break;
			case FS_PSIGN:
				putchar('%');
				break;
			case FS_RAW:
				if (rev)
					recur_event_write(rev, stdout);
				else
					event_write(ev, stdout);
				break;
			case FS_HASH:
				if (rev)
					printf("%s", recur_event_hash(rev));
				else
					printf("%s", event_hash(ev));
				break;
			case FS_EOF:
				return;
				break;
			default:
				putchar('?');
				break;
			}
		} else if (*p == '\\') {
			p += print_escape(p);
		} else {
			putchar(*p);
		}
	}
}

/* Print a formatted appointment to stdout. */
void print_apoint(const char *format, time_t day, struct apoint *apt)
{
	print_apoint_helper(format, day, apt, NULL);
}

/* Print a formatted event to stdout. */
void print_event(const char *format, time_t day, struct event *ev)
{
	print_event_helper(format, day, ev, NULL);
}

/* Print a formatted recurrent appointment to stdout. */
void
print_recur_apoint(const char *format, time_t day, time_t occurrence,
		   struct recur_apoint *rapt)
{
	struct apoint apt;

	apt.start = occurrence;
	apt.dur = rapt->dur;
	apt.mesg = rapt->mesg;
	apt.note = rapt->note;

	print_apoint_helper(format, day, &apt, rapt);
}

/* Print a formatted recurrent event to stdout. */
void print_recur_event(const char *format, time_t day,
		       struct recur_event *rev)
{
	struct event ev;

	ev.mesg = rev->mesg;
	ev.note = rev->note;

	print_event_helper(format, day, &ev, rev);
}

/* Print a formatted todo item to stdout. */
void print_todo(const char *format, struct todo *todo)
{
	const char *p;
	char extformat[FS_EXT_MAXLEN];

	for (p = format; *p; p++) {
		if (*p == '%') {
			p++;
			switch (parse_fs(&p, extformat)) {
			case FS_PRIORITY:
				printf("%d", abs(todo->id));
				break;
			case FS_MESSAGE:
				printf("%s", todo->mesg);
				break;
			case FS_NOTE:
				printf("%s", todo->note);
				break;
			case FS_NOTEFILE:
				print_notefile(stdout, todo->note, 1);
				break;
			case FS_RAW:
				todo_write(todo, stdout);
				break;
			case FS_HASH:
				printf("%s", todo_hash(todo));
				break;
			case FS_PSIGN:
				putchar('%');
				break;
			case FS_EOF:
				return;
				break;
			default:
				putchar('?');
				break;
			}
		} else if (*p == '\\') {
			p += print_escape(p);
		} else {
			putchar(*p);
		}
	}
}

int
asprintf(char **str, const char *format, ...)
{
	struct string s;
	va_list	ap;
	int n;

	va_start(ap, format);
	string_init(&s);
	n = string_vcatf(&s, format, ap);
	*str = string_buf(&s);
	va_end(ap);

	return n;
}

int starts_with(const char *s, const char *p)
{
	for (; *p && *p == *s; s++, p++);
	return (*p == '\0');
}

int starts_with_ci(const char *s, const char *p)
{
	for (; *p && tolower(*p) == tolower(*s); s++, p++);
	return (*p == '\0');
}

int hash_matches(const char *pattern, const char *hash)
{
	int invert = 0;

	if (pattern[0] == '!') {
		invert = 1;
		pattern++;
	}

	return (starts_with(hash, pattern) != invert);
}

/*
 * Overflow check for addition with positive second term.
 */
long overflow_add(long x, long y, long *z)
{
	if (!YEAR1902_2037)
		goto exit;

	if (y < 0)
		return 1;
	if (INT_MAX - y < x)
		return 1;
   exit:
	*z = x + y;
	return 0;
}

/*
 * Overflow check for multiplication with positive terms.
 */
long overflow_mul(long x, long y, long *z)
{
	if (!YEAR1902_2037)
		goto exit;

	if (x < 0 || y <= 0)
		return 1;
	if (INT_MAX / y < x)
		return 1;
   exit:
	*z = x * y;
	return 0;
}

/*
 * Return the upcoming weekday from day (possibly day itself).
 */
time_t next_wday(time_t day, int weekday)
{
	struct tm tm;

	localtime_r(&day, &tm);
	return date_sec_change(
		day, 0, (weekday - tm.tm_wday + WEEKINDAYS) % WEEKINDAYS
	);

}

/*
 * Return the number of weekdays of the year.
 */
int wday_per_year(int year, int weekday)
{
	struct tm y_end;
	struct date day;
	int last_wday;

	/* Find weekday and yearday of the last day of the year.  */
	day.dd = 31;
	day.mm = 12;
	day.yyyy = year;
	y_end = date2tm(day, 0, 0);
	mktime(&y_end);

	/* Find date of the last weekday of the year. */
	last_wday = (y_end.tm_yday + 1) - (y_end.tm_wday - weekday + 7) % 7;

	return last_wday / 7 + (last_wday % 7 > 0);
}

/*
 * Return the number of weekdays in month of year.
 */
int wday_per_month(int month, int year, int weekday)
{
	struct tm m_end;
	struct date day;
	int last_wday, m_days = days[month - 1] + (month == 2 && ISLEAP(year) ? 1 : 0);

	/* Find weekday of the last day of the month. */
	day.dd = m_days;
	day.mm = month;
	day.yyyy = year;
	m_end = date2tm(day, 0, 0);
	mktime(&m_end);

	/* Find date of the last weekday of the month. */
	last_wday = m_days - (m_end.tm_wday - weekday + 7) % 7;

	return last_wday / 7 + (last_wday % 7 > 0);
}

/*
 * Return allocated string with day of 't' inserted in 'template' in the user's
 * preferred format; template must be a "printf" template with exactly one
 * string conversion (%s).
 */
char *day_ins(char **template, time_t t)
{
	char *day, *msg;

	day = date_sec2date_str(DAY(t), DATEFMT(conf.input_datefmt));
	asprintf(&msg, *template, day);
	mem_free(day);
	return msg;
}