Annotation of src/usr.bin/calendar/day.c, Revision 1.21
1.21 ! djm 1: /* $OpenBSD: day.c,v 1.20 2005/11/16 16:45:11 deraadt Exp $ */
1.1 millert 2:
3: /*
4: * Copyright (c) 1989, 1993, 1994
5: * The Regents of the University of California. All rights reserved.
6: *
7: * Redistribution and use in source and binary forms, with or without
8: * modification, are permitted provided that the following conditions
9: * are met:
10: * 1. Redistributions of source code must retain the above copyright
11: * notice, this list of conditions and the following disclaimer.
12: * 2. Redistributions in binary form must reproduce the above copyright
13: * notice, this list of conditions and the following disclaimer in the
14: * documentation and/or other materials provided with the distribution.
1.15 millert 15: * 3. Neither the name of the University nor the names of its contributors
1.1 millert 16: * may be used to endorse or promote products derived from this software
17: * without specific prior written permission.
18: *
19: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29: * SUCH DAMAGE.
30: */
31:
32: #ifndef lint
33: static const char copyright[] =
34: "@(#) Copyright (c) 1989, 1993\n\
35: The Regents of the University of California. All rights reserved.\n";
36: #endif /* not lint */
37:
38: #ifndef lint
39: #if 0
40: static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
41: #else
1.21 ! djm 42: static const char rcsid[] = "$OpenBSD: day.c,v 1.20 2005/11/16 16:45:11 deraadt Exp $";
1.1 millert 43: #endif
44: #endif /* not lint */
45:
46: #include <sys/types.h>
47: #include <sys/uio.h>
48:
49: #include <ctype.h>
50: #include <err.h>
51: #include <locale.h>
52: #include <stdio.h>
53: #include <stdlib.h>
54: #include <string.h>
55: #include <time.h>
56: #include <tzfile.h>
57:
58: #include "pathnames.h"
59: #include "calendar.h"
60:
1.7 pjanzen 61: #define WEEKLY 1
62: #define MONTHLY 2
63: #define YEARLY 3
64:
1.1 millert 65: struct tm *tp;
1.7 pjanzen 66: int *cumdays, offset;
1.1 millert 67: char dayname[10];
1.16 mickey 68: enum calendars calendar;
69: u_long julian;
1.1 millert 70:
71:
72: /* 1-based month, 0-based days, cumulative */
73: int daytab[][14] = {
74: { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
75: { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
76: };
77:
78: static char *days[] = {
79: "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
80: };
81:
82: static char *months[] = {
83: "jan", "feb", "mar", "apr", "may", "jun",
84: "jul", "aug", "sep", "oct", "nov", "dec", NULL,
85: };
86:
87: static struct fixs fndays[8]; /* full national days names */
88: static struct fixs ndays[8]; /* short national days names */
89:
90: static struct fixs fnmonths[13]; /* full national months names */
91: static struct fixs nmonths[13]; /* short national month names */
92:
93:
1.20 deraadt 94: void
95: setnnames(void)
1.1 millert 96: {
97: char buf[80];
98: int i, l;
99: struct tm tm;
100:
101: for (i = 0; i < 7; i++) {
102: tm.tm_wday = i;
1.3 millert 103: l = strftime(buf, sizeof(buf), "%a", &tm);
104: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 105: ;
106: buf[l] = '\0';
107: if (ndays[i].name != NULL)
108: free(ndays[i].name);
109: if ((ndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 110: err(1, NULL);
1.1 millert 111: ndays[i].len = strlen(buf);
112:
1.3 millert 113: l = strftime(buf, sizeof(buf), "%A", &tm);
114: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 115: ;
116: buf[l] = '\0';
117: if (fndays[i].name != NULL)
118: free(fndays[i].name);
119: if ((fndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 120: err(1, NULL);
1.1 millert 121: fndays[i].len = strlen(buf);
122: }
123:
124: for (i = 0; i < 12; i++) {
125: tm.tm_mon = i;
1.3 millert 126: l = strftime(buf, sizeof(buf), "%b", &tm);
127: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 128: ;
129: buf[l] = '\0';
130: if (nmonths[i].name != NULL)
131: free(nmonths[i].name);
132: if ((nmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 133: err(1, NULL);
1.1 millert 134: nmonths[i].len = strlen(buf);
135:
1.3 millert 136: l = strftime(buf, sizeof(buf), "%B", &tm);
137: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 138: ;
139: buf[l] = '\0';
140: if (fnmonths[i].name != NULL)
141: free(fnmonths[i].name);
142: if ((fnmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 143: err(1, NULL);
1.1 millert 144: fnmonths[i].len = strlen(buf);
145: }
1.7 pjanzen 146: /* Hardwired special events */
1.18 mickey 147: spev[0].name = strdup(PESACH);
148: spev[0].nlen = PESACHLEN;
149: spev[0].getev = pesach;
150: spev[1].name = strdup(EASTER);
151: spev[1].nlen = EASTERNAMELEN;
152: spev[1].getev = easter;
153: spev[2].name = strdup(PASKHA);
154: spev[2].nlen = PASKHALEN;
155: spev[2].getev = paskha;
1.7 pjanzen 156: for (i = 0; i < NUMEV; i++) {
157: if (spev[i].name == NULL)
1.11 pjanzen 158: err(1, NULL);
1.7 pjanzen 159: spev[i].uname = NULL;
160: }
1.1 millert 161: }
162:
163: void
1.20 deraadt 164: settime(time_t *now)
1.1 millert 165: {
1.7 pjanzen 166: tp = localtime(now);
167: tp->tm_sec = 0;
168: tp->tm_min = 0;
169: /* Avoid getting caught by a timezone shift; set time to noon */
170: tp->tm_isdst = 0;
171: tp->tm_hour = 12;
172: *now = mktime(tp);
173: if (isleap(tp->tm_year + TM_YEAR_BASE))
1.1 millert 174: cumdays = daytab[1];
1.7 pjanzen 175: else
1.1 millert 176: cumdays = daytab[0];
177: /* Friday displays Monday's events */
178: offset = tp->tm_wday == 5 ? 3 : 1;
1.19 mickey 179: if (f_SetdayAfter)
1.7 pjanzen 180: offset = 0; /* Except not when range is set explicitly */
1.1 millert 181: header[5].iov_base = dayname;
182:
183: (void) setlocale(LC_TIME, "C");
184: header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
185: (void) setlocale(LC_TIME, "");
186:
187: setnnames();
188: }
189:
1.2 millert 190: /* convert [Year][Month]Day into unix time (since 1970)
191: * Year: two or four digits, Month: two digits, Day: two digits
1.1 millert 192: */
1.20 deraadt 193: time_t
194: Mktime(char *date)
1.1 millert 195: {
1.20 deraadt 196: time_t t;
197: int len;
198: struct tm tm;
1.1 millert 199:
1.20 deraadt 200: (void)time(&t);
201: tp = localtime(&t);
202:
203: len = strlen(date);
204: if (len < 2)
205: return((time_t)-1);
206: tm.tm_sec = 0;
207: tm.tm_min = 0;
208: /* Avoid getting caught by a timezone shift; set time to noon */
209: tm.tm_isdst = 0;
210: tm.tm_hour = 12;
211: tm.tm_wday = 0;
212: tm.tm_mday = tp->tm_mday;
213: tm.tm_mon = tp->tm_mon;
214: tm.tm_year = tp->tm_year;
215:
216: /* Day */
217: tm.tm_mday = atoi(date + len - 2);
218:
219: /* Month */
220: if (len >= 4) {
221: *(date + len - 2) = '\0';
222: tm.tm_mon = atoi(date + len - 4) - 1;
223: }
224:
225: /* Year */
226: if (len >= 6) {
1.7 pjanzen 227: *(date + len - 4) = '\0';
228: tm.tm_year = atoi(date);
1.1 millert 229:
1.20 deraadt 230: /* tm_year up TM_YEAR_BASE ... */
231: if (tm.tm_year < 69) /* Y2K */
232: tm.tm_year += 2000 - TM_YEAR_BASE;
233: else if (tm.tm_year < 100)
234: tm.tm_year += 1900 - TM_YEAR_BASE;
235: else if (tm.tm_year > TM_YEAR_BASE)
236: tm.tm_year -= TM_YEAR_BASE;
237: }
1.1 millert 238:
239: #if DEBUG
1.20 deraadt 240: printf("Mktime: %d %d %d %s\n", (int)mktime(&tm), (int)t, len,
241: asctime(&tm));
1.1 millert 242: #endif
1.20 deraadt 243: return(mktime(&tm));
1.1 millert 244: }
245:
1.16 mickey 246: void
247: adjust_calendar(int *day, int *month)
248: {
249: switch (calendar) {
250: case GREGORIAN:
251: break;
252:
253: case JULIAN:
254: *day += julian;
255: if (*day > (cumdays[*month + 1] - cumdays[*month])) {
256: *day -= (cumdays[*month + 1] - cumdays[*month]);
257: if (++*month > 12)
258: *month = 1;
259: }
260: break;
261: case LUNAR:
262: break;
263: }
264: }
265:
1.1 millert 266: /*
267: * Possible date formats include any combination of:
268: * 3-charmonth (January, Jan, Jan)
269: * 3-charweekday (Friday, Monday, mon.)
270: * numeric month or day (1, 2, 04)
271: *
1.10 pjanzen 272: * Any character except \t or '*' may separate them, or they may not be
273: * separated. Any line following a line that is matched, that starts
274: * with \t, is shown along with the matched line.
1.1 millert 275: */
1.6 pjanzen 276: struct match *
1.20 deraadt 277: isnow(char *endp, int bodun)
1.1 millert 278: {
1.7 pjanzen 279: int day = 0, flags = 0, month = 0, v1, v2, i;
280: int monthp, dayp, varp = 0;
281: struct match *matches = NULL, *tmp, *tmp2;
282: int interval = YEARLY; /* how frequently the event repeats. */
283: int vwd = 0; /* Variable weekday */
284: time_t tdiff, ttmp;
285: struct tm tmtmp;
1.1 millert 286:
287: /*
288: * CONVENTION
289: *
290: * Month: 1-12
291: * Monthname: Jan .. Dec
292: * Day: 1-31
293: * Weekday: Mon-Sun
294: *
295: */
296:
297: /* read first field */
298: /* didn't recognize anything, skip it */
299: if (!(v1 = getfield(endp, &endp, &flags)))
1.6 pjanzen 300: return (NULL);
1.1 millert 301:
1.12 mickey 302: /* adjust bodun rate */
303: if (bodun && !bodun_always)
1.21 ! djm 304: bodun = !arc4random_uniform(3);
1.12 mickey 305:
1.1 millert 306: /* Easter or Easter depending days */
1.7 pjanzen 307: if (flags & F_SPECIAL)
308: vwd = v1;
1.1 millert 309:
310: /*
311: * 1. {Weekday,Day} XYZ ...
312: *
313: * where Day is > 12
314: */
315: else if (flags & F_ISDAY || v1 > 12) {
316:
1.7 pjanzen 317: /* found a day; day: 13-31 or weekday: 1-7 */
1.1 millert 318: day = v1;
319:
320: /* {Day,Weekday} {Month,Monthname} ... */
1.7 pjanzen 321: /* if no recognizable month, assume just a day alone -- this is
322: * very unlikely and can only happen after the first 12 days.
323: * --find month or use current month */
324: if (!(month = getfield(endp, &endp, &flags))) {
1.1 millert 325: month = tp->tm_mon + 1;
1.7 pjanzen 326: /* F_ISDAY is set only if a weekday was spelled out */
327: /* F_ISDAY must be set if 0 < day < 8 */
328: if ((day <= 7) && (day >= 1))
329: interval = WEEKLY;
330: else
331: interval = MONTHLY;
332: } else if ((day <= 7) && (day >= 1))
333: day += 10;
334: /* it's a weekday; make it the first one of the month */
335: if (month == -1) {
336: month = tp->tm_mon + 1;
337: interval = MONTHLY;
1.16 mickey 338: } else if (calendar)
339: adjust_calendar(&day, &month);
1.7 pjanzen 340: if ((month > 12) || (month < 1))
341: return (NULL);
1.1 millert 342: }
343:
344: /* 2. {Monthname} XYZ ... */
345: else if (flags & F_ISMONTH) {
346: month = v1;
1.7 pjanzen 347: if (month == -1) {
348: month = tp->tm_mon + 1;
349: interval = MONTHLY;
350: }
1.1 millert 351: /* Monthname {day,weekday} */
352: /* if no recognizable day, assume the first day in month */
353: if (!(day = getfield(endp, &endp, &flags)))
354: day = 1;
1.7 pjanzen 355: /* If a weekday was spelled out without an ordering,
356: * assume the first of that day in the month */
1.16 mickey 357: if ((flags & F_ISDAY)) {
358: if ((day >= 1) && (day <=7))
359: day += 10;
360: } else if (calendar)
361: adjust_calendar(&day, &month);
1.1 millert 362: }
363:
364: /* Hm ... */
365: else {
366: v2 = getfield(endp, &endp, &flags);
367:
368: /*
369: * {Day} {Monthname} ...
370: * where Day <= 12
371: */
372: if (flags & F_ISMONTH) {
373: day = v1;
374: month = v2;
1.7 pjanzen 375: if (month == -1) {
376: month = tp->tm_mon + 1;
377: interval = MONTHLY;
1.16 mickey 378: } else if (calendar)
379: adjust_calendar(&day, &month);
1.1 millert 380: }
381:
382: /* {Month} {Weekday,Day} ... */
383: else {
384: /* F_ISDAY set, v2 > 12, or no way to tell */
385: month = v1;
386: /* if no recognizable day, assume the first */
387: day = v2 ? v2 : 1;
1.16 mickey 388: if ((flags & F_ISDAY)) {
389: if ((day >= 1) && (day <= 7))
390: day += 10;
391: } else
392: adjust_calendar(&day, &month);
1.1 millert 393: }
394: }
395:
396: /* convert Weekday into *next* Day,
397: * e.g.: 'Sunday' -> 22
1.5 pjanzen 398: * 'SundayLast' -> ??
1.1 millert 399: */
400: if (flags & F_ISDAY) {
401: #if DEBUG
1.7 pjanzen 402: fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
1.1 millert 403: #endif
404:
1.7 pjanzen 405: varp = 1;
406: /* variable weekday, SundayLast, MondayFirst ... */
407: if (day < 0 || day >= 10)
408: vwd = day;
409: else {
410: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
411: interval = WEEKLY;
412: }
413: } else
414: /* Check for silliness. Note we still catch Feb 29 */
415: if (!(flags & F_SPECIAL) &&
416: (day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
417: if (!((month == 2 && day == 29) ||
418: (interval == MONTHLY && day <= 31)))
419: return (NULL);
1.1 millert 420: }
421:
1.7 pjanzen 422: if (!(flags & F_SPECIAL)) {
423: monthp = month;
424: dayp = day;
425: day = cumdays[month] + day;
1.5 pjanzen 426: #if DEBUG
1.7 pjanzen 427: fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
1.5 pjanzen 428: #endif
1.7 pjanzen 429: /* Speed up processing for the most common situation: yearly events
430: * when the interval being checked is less than a month or so (this
431: * could be less than a year, but then we have to start worrying about
432: * leap years). Only one event can match, and it's easy to find.
433: * Note we can't check special events, because they can wander widely.
434: */
435: if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
436: memcpy(&tmtmp, tp, sizeof(struct tm));
437: tmtmp.tm_mday = dayp;
438: tmtmp.tm_mon = monthp - 1;
1.8 pjanzen 439: if (vwd) {
440: /* We want the event next year if it's late now
441: * this year. The 50-day limit means we don't have to
442: * worry if next year is or isn't a leap year.
443: */
444: if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
445: variable_weekday(&vwd, tmtmp.tm_mon + 1,
446: tmtmp.tm_year + TM_YEAR_BASE + 1);
447: else
448: variable_weekday(&vwd, tmtmp.tm_mon + 1,
449: tmtmp.tm_year + TM_YEAR_BASE);
450: day = cumdays[tmtmp.tm_mon + 1] + vwd;
451: tmtmp.tm_mday = vwd;
452: }
1.7 pjanzen 453: v2 = day - tp->tm_yday;
454: if ((v2 > v1) || (v2 < 0)) {
455: if ((v2 += isleap(tp->tm_year + TM_YEAR_BASE) ? 366 : 365)
456: <= v1)
457: tmtmp.tm_year++;
1.12 mickey 458: else if(!bodun || (day - tp->tm_yday) != -1)
1.7 pjanzen 459: return(NULL);
460: }
461: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 462: err(1, NULL);
1.13 mickey 463:
464: if (bodun && (day - tp->tm_yday) == -1) {
465: tmp->when = f_time - 1 * SECSPERDAY;
466: tmtmp.tm_mday++;
467: tmp->bodun = 1;
468: } else {
469: tmp->when = f_time + v2 * SECSPERDAY;
470: tmp->bodun = 0;
471: }
472:
1.7 pjanzen 473: (void)mktime(&tmtmp);
474: if (strftime(tmp->print_date,
475: sizeof(tmp->print_date),
476: /* "%a %b %d", &tm); Skip weekdays */
477: "%b %d", &tmtmp) == 0)
478: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.12 mickey 479:
1.7 pjanzen 480: tmp->var = varp;
481: tmp->next = NULL;
482: return(tmp);
483: }
1.16 mickey 484: } else {
1.7 pjanzen 485: varp = 1;
486: /* Set up v1 to the event number and ... */
487: v1 = vwd % (NUMEV + 1) - 1;
488: vwd /= (NUMEV + 1);
489: if (v1 < 0) {
490: v1 += NUMEV + 1;
491: vwd--;
492: }
493: dayp = monthp = 1; /* Why not */
1.1 millert 494: }
495:
1.7 pjanzen 496: /* Compare to past and coming instances of the event. The i == 0 part
497: * of the loop corresponds to this specific instance. Note that we
498: * can leave things sort of higgledy-piggledy since a mktime() happens
499: * on this before anything gets printed. Also note that even though
500: * we've effectively gotten rid of f_dayBefore, we still have to check
501: * the one prior event for situations like "the 31st of every month"
502: * and "yearly" events which could happen twice in one year but not in
503: * the next */
504: tmp2 = matches;
505: for (i = -1; i < 2; i++) {
506: memcpy(&tmtmp, tp, sizeof(struct tm));
507: tmtmp.tm_mday = dayp;
508: tmtmp.tm_mon = month = monthp - 1;
509: do {
510: v2 = 0;
511: switch (interval) {
512: case WEEKLY:
513: tmtmp.tm_mday += 7 * i;
514: break;
515: case MONTHLY:
516: month += i;
517: tmtmp.tm_mon = month;
518: switch(tmtmp.tm_mon) {
519: case -1:
520: tmtmp.tm_mon = month = 11;
521: tmtmp.tm_year--;
522: break;
523: case 12:
524: tmtmp.tm_mon = month = 0;
525: tmtmp.tm_year++;
526: break;
527: }
528: if (vwd) {
529: v1 = vwd;
530: variable_weekday(&v1, tmtmp.tm_mon + 1,
531: tmtmp.tm_year + TM_YEAR_BASE);
532: tmtmp.tm_mday = v1;
533: } else
534: tmtmp.tm_mday = dayp;
535: break;
536: case YEARLY:
537: default:
538: tmtmp.tm_year += i;
539: if (flags & F_SPECIAL) {
540: tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
541: tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
1.9 pjanzen 542: TM_YEAR_BASE) + vwd;
1.7 pjanzen 543: } else if (vwd) {
544: v1 = vwd;
545: variable_weekday(&v1, tmtmp.tm_mon + 1,
546: tmtmp.tm_year + TM_YEAR_BASE);
547: tmtmp.tm_mday = v1;
548: } else {
549: /* Need the following to keep Feb 29 from
550: * becoming Mar 1 */
551: tmtmp.tm_mday = dayp;
552: tmtmp.tm_mon = monthp - 1;
553: }
554: break;
555: }
556: /* How many days apart are we */
557: if ((ttmp = mktime(&tmtmp)) == -1)
558: warnx("time out of range: %s", endp);
559: else {
560: tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
1.12 mickey 561: if (tdiff <= offset + f_dayAfter ||
562: (bodun && tdiff == -1)) {
563: if (tdiff >= 0 ||
564: (bodun && tdiff == -1)) {
1.7 pjanzen 565: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 566: err(1, NULL);
1.7 pjanzen 567: tmp->when = ttmp;
568: if (strftime(tmp->print_date,
569: sizeof(tmp->print_date),
570: /* "%a %b %d", &tm); Skip weekdays */
571: "%b %d", &tmtmp) == 0)
572: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.13 mickey 573: tmp->bodun = bodun && tdiff == -1;
1.7 pjanzen 574: tmp->var = varp;
575: tmp->next = NULL;
576: if (tmp2)
577: tmp2->next = tmp;
578: else
579: matches = tmp;
580: tmp2 = tmp;
581: v2 = (i == 1) ? 1 : 0;
582: }
583: } else
584: i = 2; /* No point checking in the future */
585: }
586: } while (v2 != 0);
1.6 pjanzen 587: }
1.7 pjanzen 588: return (matches);
1.1 millert 589: }
590:
591:
592: int
1.20 deraadt 593: getmonth(char *s)
1.1 millert 594: {
1.14 mpech 595: char **p;
1.1 millert 596: struct fixs *n;
597:
598: for (n = fnmonths; n->name; ++n)
599: if (!strncasecmp(s, n->name, n->len))
600: return ((n - fnmonths) + 1);
601: for (n = nmonths; n->name; ++n)
602: if (!strncasecmp(s, n->name, n->len))
603: return ((n - nmonths) + 1);
604: for (p = months; *p; ++p)
605: if (!strncasecmp(s, *p, 3))
606: return ((p - months) + 1);
607: return (0);
608: }
609:
610:
611: int
1.20 deraadt 612: getday(char *s)
1.1 millert 613: {
1.14 mpech 614: char **p;
1.1 millert 615: struct fixs *n;
616:
617: for (n = fndays; n->name; ++n)
618: if (!strncasecmp(s, n->name, n->len))
619: return ((n - fndays) + 1);
620: for (n = ndays; n->name; ++n)
621: if (!strncasecmp(s, n->name, n->len))
622: return ((n - ndays) + 1);
623: for (p = days; *p; ++p)
624: if (!strncasecmp(s, *p, 3))
625: return ((p - days) + 1);
626: return (0);
627: }
628:
629: /* return offset for variable weekdays
630: * -1 -> last weekday in month
631: * +1 -> first weekday in month
632: * ... etc ...
633: */
634: int
1.20 deraadt 635: getdayvar(char *s)
1.1 millert 636: {
1.14 mpech 637: int offset;
1.1 millert 638:
639:
640: offset = strlen(s);
641:
642: /* Sun+1 or Wednesday-2
643: * ^ ^ */
644:
645: /* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
646: switch(*(s + offset - 2)) {
647: case '-':
648: case '+':
1.7 pjanzen 649: return(atoi(s + offset - 2));
1.1 millert 650: break;
651: }
652:
653: /*
654: * some aliases: last, first, second, third, fourth
655: */
656:
657: /* last */
658: if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
659: return(-1);
660: else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
661: return(+1);
662: else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
663: return(+2);
664: else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
665: return(+3);
666: else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
667: return(+4);
668:
669: /* no offset detected */
670: return(0);
1.7 pjanzen 671: }
672:
673:
674: int
1.20 deraadt 675: foy(int year)
1.7 pjanzen 676: {
677: /* 0-6; what weekday Jan 1 is */
678: year--;
679: return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
680: }
681:
682:
683:
684: void
1.20 deraadt 685: variable_weekday(int *day, int month, int year)
1.7 pjanzen 686: {
687: int v1, v2;
688: int *cumdays;
689: int day1;
690:
691: if (isleap(year))
692: cumdays = daytab[1];
693: else
694: cumdays = daytab[0];
695: day1 = foy(year);
696: /* negative offset; last, -4 .. -1 */
697: if (*day < 0) {
698: v1 = *day/10 - 1; /* offset -4 ... -1 */
699: *day = 10 + (*day % 10); /* day 1 ... 7 */
700:
701: /* which weekday the end of the month is (1-7) */
702: v2 = (cumdays[month + 1] + day1) % 7 + 1;
703:
704: /* and subtract enough days */
705: *day = cumdays[month + 1] - cumdays[month] +
706: (v1 + 1) * 7 - (v2 - *day + 7) % 7;
707: #if DEBUG
708: fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
709: #endif
710: }
711:
712: /* first, second ... +1 ... +5 */
713: else {
714: v1 = *day/10; /* offset */
715: *day = *day % 10;
716:
717: /* which weekday the first of the month is (1-7) */
718: v2 = (cumdays[month] + 1 + day1) % 7 + 1;
719:
720: /* and add enough days */
721: *day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
722: #if DEBUG
723: fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
724: #endif
725: }
1.1 millert 726: }
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