Annotation of src/usr.bin/calendar/day.c, Revision 1.37
1.37 ! millert 1: /* $OpenBSD: day.c,v 1.36 2019/02/01 16:22:53 millert 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: #include <sys/types.h>
33: #include <sys/uio.h>
34:
35: #include <ctype.h>
36: #include <err.h>
37: #include <locale.h>
38: #include <stdio.h>
39: #include <stdlib.h>
40: #include <string.h>
41: #include <time.h>
42:
43: #include "pathnames.h"
44: #include "calendar.h"
1.23 jsg 45:
46: extern struct iovec header[];
1.1 millert 47:
1.7 pjanzen 48: #define WEEKLY 1
49: #define MONTHLY 2
50: #define YEARLY 3
51:
1.1 millert 52: struct tm *tp;
1.7 pjanzen 53: int *cumdays, offset;
1.1 millert 54: char dayname[10];
1.16 mickey 55: enum calendars calendar;
56: u_long julian;
1.1 millert 57:
58:
59: /* 1-based month, 0-based days, cumulative */
60: int daytab[][14] = {
61: { 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
62: { 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
63: };
64:
65: static char *days[] = {
66: "sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
67: };
68:
69: static char *months[] = {
70: "jan", "feb", "mar", "apr", "may", "jun",
71: "jul", "aug", "sep", "oct", "nov", "dec", NULL,
72: };
73:
74: static struct fixs fndays[8]; /* full national days names */
75: static struct fixs ndays[8]; /* short national days names */
76:
77: static struct fixs fnmonths[13]; /* full national months names */
78: static struct fixs nmonths[13]; /* short national month names */
79:
1.20 deraadt 80: void
1.31 espie 81: fill_print_date(struct match *m, struct tm *tm)
82: {
83: if (strftime(m->print_date, sizeof(m->print_date),
84: daynames ? "%a %b %d" : "%b %d", tm) == 0)
85: m->print_date[sizeof(m->print_date) - 1] = '\0';
86: }
87:
88: void
1.20 deraadt 89: setnnames(void)
1.1 millert 90: {
91: char buf[80];
92: int i, l;
93: struct tm tm;
94:
95: for (i = 0; i < 7; i++) {
96: tm.tm_wday = i;
1.3 millert 97: l = strftime(buf, sizeof(buf), "%a", &tm);
1.27 deraadt 98: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 99: ;
100: buf[l] = '\0';
1.32 mmcc 101: free(ndays[i].name);
1.1 millert 102: if ((ndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 103: err(1, NULL);
1.1 millert 104: ndays[i].len = strlen(buf);
105:
1.3 millert 106: l = strftime(buf, sizeof(buf), "%A", &tm);
1.27 deraadt 107: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 108: ;
109: buf[l] = '\0';
1.32 mmcc 110: free(fndays[i].name);
1.1 millert 111: if ((fndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 112: err(1, NULL);
1.1 millert 113: fndays[i].len = strlen(buf);
114: }
115:
116: for (i = 0; i < 12; i++) {
117: tm.tm_mon = i;
1.3 millert 118: l = strftime(buf, sizeof(buf), "%b", &tm);
1.27 deraadt 119: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 120: ;
121: buf[l] = '\0';
1.32 mmcc 122: free(nmonths[i].name);
1.1 millert 123: if ((nmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 124: err(1, NULL);
1.1 millert 125: nmonths[i].len = strlen(buf);
126:
1.3 millert 127: l = strftime(buf, sizeof(buf), "%B", &tm);
1.27 deraadt 128: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 129: ;
130: buf[l] = '\0';
1.32 mmcc 131: free(fnmonths[i].name);
1.1 millert 132: if ((fnmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 133: err(1, NULL);
1.1 millert 134: fnmonths[i].len = strlen(buf);
135: }
1.7 pjanzen 136: /* Hardwired special events */
1.18 mickey 137: spev[0].name = strdup(PESACH);
138: spev[0].nlen = PESACHLEN;
139: spev[0].getev = pesach;
140: spev[1].name = strdup(EASTER);
141: spev[1].nlen = EASTERNAMELEN;
142: spev[1].getev = easter;
143: spev[2].name = strdup(PASKHA);
144: spev[2].nlen = PASKHALEN;
145: spev[2].getev = paskha;
1.7 pjanzen 146: for (i = 0; i < NUMEV; i++) {
147: if (spev[i].name == NULL)
1.11 pjanzen 148: err(1, NULL);
1.7 pjanzen 149: spev[i].uname = NULL;
150: }
1.1 millert 151: }
152:
153: void
1.20 deraadt 154: settime(time_t *now)
1.1 millert 155: {
1.7 pjanzen 156: tp = localtime(now);
157: tp->tm_sec = 0;
158: tp->tm_min = 0;
159: /* Avoid getting caught by a timezone shift; set time to noon */
160: tp->tm_isdst = 0;
161: tp->tm_hour = 12;
162: *now = mktime(tp);
1.29 millert 163: if (isleap(tp->tm_year + 1900))
1.1 millert 164: cumdays = daytab[1];
1.7 pjanzen 165: else
1.1 millert 166: cumdays = daytab[0];
167: /* Friday displays Monday's events */
168: offset = tp->tm_wday == 5 ? 3 : 1;
1.36 millert 169: if (f_Setday)
1.7 pjanzen 170: offset = 0; /* Except not when range is set explicitly */
1.1 millert 171: header[5].iov_base = dayname;
172:
173: (void) setlocale(LC_TIME, "C");
174: header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
175: (void) setlocale(LC_TIME, "");
176:
177: setnnames();
178: }
179:
1.2 millert 180: /* convert [Year][Month]Day into unix time (since 1970)
181: * Year: two or four digits, Month: two digits, Day: two digits
1.1 millert 182: */
1.20 deraadt 183: time_t
184: Mktime(char *date)
1.1 millert 185: {
1.20 deraadt 186: time_t t;
187: int len;
188: struct tm tm;
1.1 millert 189:
1.20 deraadt 190: (void)time(&t);
191: tp = localtime(&t);
192:
193: len = strlen(date);
194: if (len < 2)
195: return((time_t)-1);
1.25 deraadt 196: bzero(&tm, sizeof tm);
1.20 deraadt 197: tm.tm_sec = 0;
198: tm.tm_min = 0;
199: /* Avoid getting caught by a timezone shift; set time to noon */
200: tm.tm_isdst = 0;
201: tm.tm_hour = 12;
202: tm.tm_wday = 0;
203: tm.tm_mday = tp->tm_mday;
204: tm.tm_mon = tp->tm_mon;
205: tm.tm_year = tp->tm_year;
206:
207: /* Day */
208: tm.tm_mday = atoi(date + len - 2);
209:
210: /* Month */
211: if (len >= 4) {
212: *(date + len - 2) = '\0';
213: tm.tm_mon = atoi(date + len - 4) - 1;
214: }
215:
216: /* Year */
217: if (len >= 6) {
1.7 pjanzen 218: *(date + len - 4) = '\0';
219: tm.tm_year = atoi(date);
1.1 millert 220:
1.20 deraadt 221: if (tm.tm_year < 69) /* Y2K */
1.29 millert 222: tm.tm_year += 100;
223: else if (tm.tm_year > 1900)
224: tm.tm_year -= 1900;
1.20 deraadt 225: }
1.1 millert 226:
227: #if DEBUG
1.24 deraadt 228: printf("Mktime: %d %lld %d %s\n", (int)mktime(&tm), (long long)t, len,
1.20 deraadt 229: asctime(&tm));
1.1 millert 230: #endif
1.20 deraadt 231: return(mktime(&tm));
1.1 millert 232: }
233:
1.26 deraadt 234: static void
1.16 mickey 235: adjust_calendar(int *day, int *month)
236: {
237: switch (calendar) {
238: case GREGORIAN:
239: break;
240:
241: case JULIAN:
242: *day += julian;
243: if (*day > (cumdays[*month + 1] - cumdays[*month])) {
244: *day -= (cumdays[*month + 1] - cumdays[*month]);
245: if (++*month > 12)
246: *month = 1;
247: }
248: break;
249: case LUNAR:
250: break;
251: }
252: }
253:
1.1 millert 254: /*
255: * Possible date formats include any combination of:
256: * 3-charmonth (January, Jan, Jan)
257: * 3-charweekday (Friday, Monday, mon.)
258: * numeric month or day (1, 2, 04)
259: *
1.10 pjanzen 260: * Any character except \t or '*' may separate them, or they may not be
261: * separated. Any line following a line that is matched, that starts
262: * with \t, is shown along with the matched line.
1.1 millert 263: */
1.6 pjanzen 264: struct match *
1.20 deraadt 265: isnow(char *endp, int bodun)
1.1 millert 266: {
1.7 pjanzen 267: int day = 0, flags = 0, month = 0, v1, v2, i;
268: int monthp, dayp, varp = 0;
269: struct match *matches = NULL, *tmp, *tmp2;
270: int interval = YEARLY; /* how frequently the event repeats. */
271: int vwd = 0; /* Variable weekday */
272: time_t tdiff, ttmp;
273: struct tm tmtmp;
1.1 millert 274:
275: /*
276: * CONVENTION
277: *
278: * Month: 1-12
279: * Monthname: Jan .. Dec
280: * Day: 1-31
281: * Weekday: Mon-Sun
282: *
283: */
284:
285: /* read first field */
286: /* didn't recognize anything, skip it */
287: if (!(v1 = getfield(endp, &endp, &flags)))
1.6 pjanzen 288: return (NULL);
1.1 millert 289:
1.12 mickey 290: /* adjust bodun rate */
291: if (bodun && !bodun_always)
1.21 djm 292: bodun = !arc4random_uniform(3);
1.30 zhuk 293:
1.1 millert 294: /* Easter or Easter depending days */
1.7 pjanzen 295: if (flags & F_SPECIAL)
296: vwd = v1;
1.1 millert 297:
298: /*
299: * 1. {Weekday,Day} XYZ ...
300: *
301: * where Day is > 12
302: */
303: else if (flags & F_ISDAY || v1 > 12) {
304:
1.7 pjanzen 305: /* found a day; day: 13-31 or weekday: 1-7 */
1.1 millert 306: day = v1;
307:
308: /* {Day,Weekday} {Month,Monthname} ... */
1.7 pjanzen 309: /* if no recognizable month, assume just a day alone -- this is
310: * very unlikely and can only happen after the first 12 days.
311: * --find month or use current month */
312: if (!(month = getfield(endp, &endp, &flags))) {
1.1 millert 313: month = tp->tm_mon + 1;
1.7 pjanzen 314: /* F_ISDAY is set only if a weekday was spelled out */
315: /* F_ISDAY must be set if 0 < day < 8 */
316: if ((day <= 7) && (day >= 1))
317: interval = WEEKLY;
318: else
319: interval = MONTHLY;
320: } else if ((day <= 7) && (day >= 1))
321: day += 10;
322: /* it's a weekday; make it the first one of the month */
323: if (month == -1) {
324: month = tp->tm_mon + 1;
325: interval = MONTHLY;
1.37 ! millert 326: } else {
! 327: if ((month > 12) || (month < 1))
! 328: return (NULL);
! 329: if (calendar)
! 330: adjust_calendar(&day, &month);
! 331: }
1.1 millert 332: }
333:
334: /* 2. {Monthname} XYZ ... */
335: else if (flags & F_ISMONTH) {
336: month = v1;
1.7 pjanzen 337: if (month == -1) {
338: month = tp->tm_mon + 1;
339: interval = MONTHLY;
340: }
1.1 millert 341: /* Monthname {day,weekday} */
342: /* if no recognizable day, assume the first day in month */
343: if (!(day = getfield(endp, &endp, &flags)))
344: day = 1;
1.7 pjanzen 345: /* If a weekday was spelled out without an ordering,
346: * assume the first of that day in the month */
1.16 mickey 347: if ((flags & F_ISDAY)) {
348: if ((day >= 1) && (day <=7))
349: day += 10;
350: } else if (calendar)
351: adjust_calendar(&day, &month);
1.1 millert 352: }
353:
354: /* Hm ... */
355: else {
356: v2 = getfield(endp, &endp, &flags);
357:
358: /*
359: * {Day} {Monthname} ...
360: * where Day <= 12
361: */
362: if (flags & F_ISMONTH) {
363: day = v1;
364: month = v2;
1.7 pjanzen 365: if (month == -1) {
366: month = tp->tm_mon + 1;
367: interval = MONTHLY;
1.16 mickey 368: } else if (calendar)
369: adjust_calendar(&day, &month);
1.1 millert 370: }
371:
372: /* {Month} {Weekday,Day} ... */
373: else {
374: /* F_ISDAY set, v2 > 12, or no way to tell */
375: month = v1;
1.37 ! millert 376: if ((month > 12) || (month < 1))
! 377: return (NULL);
1.1 millert 378: /* if no recognizable day, assume the first */
379: day = v2 ? v2 : 1;
1.16 mickey 380: if ((flags & F_ISDAY)) {
381: if ((day >= 1) && (day <= 7))
382: day += 10;
383: } else
384: adjust_calendar(&day, &month);
1.1 millert 385: }
386: }
387:
388: /* convert Weekday into *next* Day,
389: * e.g.: 'Sunday' -> 22
1.5 pjanzen 390: * 'SundayLast' -> ??
1.1 millert 391: */
392: if (flags & F_ISDAY) {
393: #if DEBUG
1.7 pjanzen 394: fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
1.1 millert 395: #endif
396:
1.7 pjanzen 397: varp = 1;
398: /* variable weekday, SundayLast, MondayFirst ... */
399: if (day < 0 || day >= 10)
400: vwd = day;
401: else {
402: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
403: interval = WEEKLY;
404: }
405: } else
406: /* Check for silliness. Note we still catch Feb 29 */
407: if (!(flags & F_SPECIAL) &&
408: (day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
409: if (!((month == 2 && day == 29) ||
410: (interval == MONTHLY && day <= 31)))
411: return (NULL);
1.1 millert 412: }
413:
1.7 pjanzen 414: if (!(flags & F_SPECIAL)) {
415: monthp = month;
416: dayp = day;
417: day = cumdays[month] + day;
1.5 pjanzen 418: #if DEBUG
1.7 pjanzen 419: fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
1.5 pjanzen 420: #endif
1.7 pjanzen 421: /* Speed up processing for the most common situation: yearly events
422: * when the interval being checked is less than a month or so (this
423: * could be less than a year, but then we have to start worrying about
424: * leap years). Only one event can match, and it's easy to find.
425: * Note we can't check special events, because they can wander widely.
426: */
427: if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
428: memcpy(&tmtmp, tp, sizeof(struct tm));
429: tmtmp.tm_mday = dayp;
430: tmtmp.tm_mon = monthp - 1;
1.8 pjanzen 431: if (vwd) {
432: /* We want the event next year if it's late now
433: * this year. The 50-day limit means we don't have to
434: * worry if next year is or isn't a leap year.
435: */
436: if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
437: variable_weekday(&vwd, tmtmp.tm_mon + 1,
1.29 millert 438: tmtmp.tm_year + 1900 + 1);
1.8 pjanzen 439: else
440: variable_weekday(&vwd, tmtmp.tm_mon + 1,
1.29 millert 441: tmtmp.tm_year + 1900);
1.8 pjanzen 442: day = cumdays[tmtmp.tm_mon + 1] + vwd;
443: tmtmp.tm_mday = vwd;
444: }
1.7 pjanzen 445: v2 = day - tp->tm_yday;
446: if ((v2 > v1) || (v2 < 0)) {
1.29 millert 447: if ((v2 += isleap(tp->tm_year + 1900) ? 366 : 365)
1.7 pjanzen 448: <= v1)
449: tmtmp.tm_year++;
1.12 mickey 450: else if(!bodun || (day - tp->tm_yday) != -1)
1.7 pjanzen 451: return(NULL);
452: }
453: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 454: err(1, NULL);
1.13 mickey 455:
456: if (bodun && (day - tp->tm_yday) == -1) {
457: tmp->when = f_time - 1 * SECSPERDAY;
458: tmtmp.tm_mday++;
459: tmp->bodun = 1;
460: } else {
461: tmp->when = f_time + v2 * SECSPERDAY;
462: tmp->bodun = 0;
463: }
464:
1.7 pjanzen 465: (void)mktime(&tmtmp);
1.31 espie 466: fill_print_date(tmp, &tmtmp);
1.7 pjanzen 467: tmp->var = varp;
468: tmp->next = NULL;
469: return(tmp);
470: }
1.16 mickey 471: } else {
1.7 pjanzen 472: varp = 1;
473: /* Set up v1 to the event number and ... */
474: v1 = vwd % (NUMEV + 1) - 1;
475: vwd /= (NUMEV + 1);
476: if (v1 < 0) {
477: v1 += NUMEV + 1;
478: vwd--;
479: }
480: dayp = monthp = 1; /* Why not */
1.1 millert 481: }
482:
1.7 pjanzen 483: /* Compare to past and coming instances of the event. The i == 0 part
484: * of the loop corresponds to this specific instance. Note that we
485: * can leave things sort of higgledy-piggledy since a mktime() happens
486: * on this before anything gets printed. Also note that even though
487: * we've effectively gotten rid of f_dayBefore, we still have to check
488: * the one prior event for situations like "the 31st of every month"
489: * and "yearly" events which could happen twice in one year but not in
490: * the next */
491: tmp2 = matches;
492: for (i = -1; i < 2; i++) {
493: memcpy(&tmtmp, tp, sizeof(struct tm));
494: tmtmp.tm_mday = dayp;
495: tmtmp.tm_mon = month = monthp - 1;
496: do {
497: v2 = 0;
498: switch (interval) {
499: case WEEKLY:
500: tmtmp.tm_mday += 7 * i;
501: break;
502: case MONTHLY:
503: month += i;
504: tmtmp.tm_mon = month;
505: switch(tmtmp.tm_mon) {
506: case -1:
507: tmtmp.tm_mon = month = 11;
508: tmtmp.tm_year--;
509: break;
510: case 12:
511: tmtmp.tm_mon = month = 0;
512: tmtmp.tm_year++;
513: break;
514: }
515: if (vwd) {
516: v1 = vwd;
517: variable_weekday(&v1, tmtmp.tm_mon + 1,
1.29 millert 518: tmtmp.tm_year + 1900);
1.7 pjanzen 519: tmtmp.tm_mday = v1;
520: } else
521: tmtmp.tm_mday = dayp;
522: break;
523: case YEARLY:
524: default:
525: tmtmp.tm_year += i;
526: if (flags & F_SPECIAL) {
527: tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
528: tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
1.29 millert 529: 1900) + vwd;
1.7 pjanzen 530: } else if (vwd) {
531: v1 = vwd;
532: variable_weekday(&v1, tmtmp.tm_mon + 1,
1.29 millert 533: tmtmp.tm_year + 1900);
1.7 pjanzen 534: tmtmp.tm_mday = v1;
535: } else {
536: /* Need the following to keep Feb 29 from
537: * becoming Mar 1 */
538: tmtmp.tm_mday = dayp;
539: tmtmp.tm_mon = monthp - 1;
540: }
541: break;
542: }
543: /* How many days apart are we */
544: if ((ttmp = mktime(&tmtmp)) == -1)
545: warnx("time out of range: %s", endp);
546: else {
547: tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
1.12 mickey 548: if (tdiff <= offset + f_dayAfter ||
549: (bodun && tdiff == -1)) {
1.34 millert 550: if (((tmtmp.tm_mon == month) ||
551: (flags & F_SPECIAL) ||
552: (interval == WEEKLY)) &&
1.33 millert 553: (tdiff >= 0 ||
554: (bodun && tdiff == -1))) {
1.7 pjanzen 555: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 556: err(1, NULL);
1.7 pjanzen 557: tmp->when = ttmp;
1.31 espie 558: fill_print_date(tmp, &tmtmp);
1.13 mickey 559: tmp->bodun = bodun && tdiff == -1;
1.7 pjanzen 560: tmp->var = varp;
561: tmp->next = NULL;
562: if (tmp2)
563: tmp2->next = tmp;
564: else
565: matches = tmp;
566: tmp2 = tmp;
567: v2 = (i == 1) ? 1 : 0;
568: }
569: } else
570: i = 2; /* No point checking in the future */
571: }
572: } while (v2 != 0);
1.6 pjanzen 573: }
1.7 pjanzen 574: return (matches);
1.1 millert 575: }
576:
577:
578: int
1.20 deraadt 579: getmonth(char *s)
1.1 millert 580: {
1.14 mpech 581: char **p;
1.1 millert 582: struct fixs *n;
583:
584: for (n = fnmonths; n->name; ++n)
585: if (!strncasecmp(s, n->name, n->len))
586: return ((n - fnmonths) + 1);
587: for (n = nmonths; n->name; ++n)
588: if (!strncasecmp(s, n->name, n->len))
589: return ((n - nmonths) + 1);
590: for (p = months; *p; ++p)
591: if (!strncasecmp(s, *p, 3))
592: return ((p - months) + 1);
593: return (0);
594: }
595:
596:
597: int
1.20 deraadt 598: getday(char *s)
1.1 millert 599: {
1.14 mpech 600: char **p;
1.1 millert 601: struct fixs *n;
602:
603: for (n = fndays; n->name; ++n)
604: if (!strncasecmp(s, n->name, n->len))
605: return ((n - fndays) + 1);
606: for (n = ndays; n->name; ++n)
607: if (!strncasecmp(s, n->name, n->len))
608: return ((n - ndays) + 1);
609: for (p = days; *p; ++p)
610: if (!strncasecmp(s, *p, 3))
611: return ((p - days) + 1);
612: return (0);
613: }
614:
615: /* return offset for variable weekdays
616: * -1 -> last weekday in month
617: * +1 -> first weekday in month
618: * ... etc ...
619: */
620: int
1.20 deraadt 621: getdayvar(char *s)
1.1 millert 622: {
1.14 mpech 623: int offset;
1.1 millert 624:
625:
626: offset = strlen(s);
627:
628: /* Sun+1 or Wednesday-2
629: * ^ ^ */
630:
631: /* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
632: switch(*(s + offset - 2)) {
633: case '-':
634: case '+':
1.7 pjanzen 635: return(atoi(s + offset - 2));
1.1 millert 636: break;
637: }
638:
639: /*
640: * some aliases: last, first, second, third, fourth
641: */
642:
643: /* last */
644: if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
645: return(-1);
646: else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
647: return(+1);
648: else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
649: return(+2);
650: else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
651: return(+3);
652: else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
653: return(+4);
654:
655: /* no offset detected */
656: return(0);
1.7 pjanzen 657: }
658:
659:
660: int
1.20 deraadt 661: foy(int year)
1.7 pjanzen 662: {
663: /* 0-6; what weekday Jan 1 is */
664: year--;
665: return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
666: }
667:
668:
669:
670: void
1.20 deraadt 671: variable_weekday(int *day, int month, int year)
1.7 pjanzen 672: {
673: int v1, v2;
674: int *cumdays;
675: int day1;
676:
677: if (isleap(year))
678: cumdays = daytab[1];
679: else
680: cumdays = daytab[0];
681: day1 = foy(year);
682: /* negative offset; last, -4 .. -1 */
683: if (*day < 0) {
684: v1 = *day/10 - 1; /* offset -4 ... -1 */
685: *day = 10 + (*day % 10); /* day 1 ... 7 */
686:
687: /* which weekday the end of the month is (1-7) */
688: v2 = (cumdays[month + 1] + day1) % 7 + 1;
689:
690: /* and subtract enough days */
691: *day = cumdays[month + 1] - cumdays[month] +
692: (v1 + 1) * 7 - (v2 - *day + 7) % 7;
693: #if DEBUG
694: fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
695: #endif
696: }
697:
698: /* first, second ... +1 ... +5 */
699: else {
700: v1 = *day/10; /* offset */
701: *day = *day % 10;
702:
703: /* which weekday the first of the month is (1-7) */
704: v2 = (cumdays[month] + 1 + day1) % 7 + 1;
705:
706: /* and add enough days */
707: *day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
708: #if DEBUG
709: fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
710: #endif
711: }
1.1 millert 712: }
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