Annotation of src/usr.bin/calendar/day.c, Revision 1.19
1.19 ! mickey 1: /* $OpenBSD: day.c,v 1.18 2004/12/10 20:47:30 mickey 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
1.19 ! mickey 42: static const char rcsid[] = "$OpenBSD: day.c,v 1.18 2004/12/10 20:47:30 mickey 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:
94: void setnnames(void)
95: {
96: char buf[80];
97: int i, l;
98: struct tm tm;
99:
100: for (i = 0; i < 7; i++) {
101: tm.tm_wday = i;
1.3 millert 102: l = strftime(buf, sizeof(buf), "%a", &tm);
103: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 104: ;
105: buf[l] = '\0';
106: if (ndays[i].name != NULL)
107: free(ndays[i].name);
108: if ((ndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 109: err(1, NULL);
1.1 millert 110: ndays[i].len = strlen(buf);
111:
1.3 millert 112: l = strftime(buf, sizeof(buf), "%A", &tm);
113: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 114: ;
115: buf[l] = '\0';
116: if (fndays[i].name != NULL)
117: free(fndays[i].name);
118: if ((fndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 119: err(1, NULL);
1.1 millert 120: fndays[i].len = strlen(buf);
121: }
122:
123: for (i = 0; i < 12; i++) {
124: tm.tm_mon = i;
1.3 millert 125: l = strftime(buf, sizeof(buf), "%b", &tm);
126: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 127: ;
128: buf[l] = '\0';
129: if (nmonths[i].name != NULL)
130: free(nmonths[i].name);
131: if ((nmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 132: err(1, NULL);
1.1 millert 133: nmonths[i].len = strlen(buf);
134:
1.3 millert 135: l = strftime(buf, sizeof(buf), "%B", &tm);
136: for (; l > 0 && isspace((int)buf[l - 1]); l--)
1.1 millert 137: ;
138: buf[l] = '\0';
139: if (fnmonths[i].name != NULL)
140: free(fnmonths[i].name);
141: if ((fnmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 142: err(1, NULL);
1.1 millert 143: fnmonths[i].len = strlen(buf);
144: }
1.7 pjanzen 145: /* Hardwired special events */
1.18 mickey 146: spev[0].name = strdup(PESACH);
147: spev[0].nlen = PESACHLEN;
148: spev[0].getev = pesach;
149: spev[1].name = strdup(EASTER);
150: spev[1].nlen = EASTERNAMELEN;
151: spev[1].getev = easter;
152: spev[2].name = strdup(PASKHA);
153: spev[2].nlen = PASKHALEN;
154: spev[2].getev = paskha;
1.7 pjanzen 155: for (i = 0; i < NUMEV; i++) {
156: if (spev[i].name == NULL)
1.11 pjanzen 157: err(1, NULL);
1.7 pjanzen 158: spev[i].uname = NULL;
159: }
1.1 millert 160: }
161:
162: void
163: settime(now)
1.7 pjanzen 164: 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: */
193: time_t Mktime (date)
194: char *date;
195: {
196: time_t t;
197: int len;
198: struct tm tm;
199:
200: (void)time(&t);
201: tp = localtime(&t);
202:
203: len = strlen(date);
1.2 millert 204: if (len < 2)
205: return((time_t)-1);
1.1 millert 206: tm.tm_sec = 0;
207: tm.tm_min = 0;
1.5 pjanzen 208: /* Avoid getting caught by a timezone shift; set time to noon */
209: tm.tm_isdst = 0;
210: tm.tm_hour = 12;
1.1 millert 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:
1.2 millert 216: /* Day */
217: tm.tm_mday = atoi(date + len - 2);
1.1 millert 218:
1.2 millert 219: /* Month */
1.1 millert 220: if (len >= 4) {
1.2 millert 221: *(date + len - 2) = '\0';
222: tm.tm_mon = atoi(date + len - 4) - 1;
1.1 millert 223: }
224:
225: /* Year */
1.5 pjanzen 226: if (len >= 6) {
1.7 pjanzen 227: *(date + len - 4) = '\0';
228: tm.tm_year = atoi(date);
1.1 millert 229:
1.4 deraadt 230: /* tm_year up TM_YEAR_BASE ... */
1.5 pjanzen 231: if (tm.tm_year < 69) /* Y2K */
1.4 deraadt 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;
1.1 millert 237: }
238:
239: #if DEBUG
240: printf("Mktime: %d %d %d %s\n", (int)mktime(&tm), (int)t, len,
241: asctime(&tm));
242: #endif
243: return(mktime(&tm));
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 *
1.12 mickey 277: isnow(endp, bodun)
1.1 millert 278: char *endp;
1.12 mickey 279: int bodun;
1.1 millert 280: {
1.7 pjanzen 281: int day = 0, flags = 0, month = 0, v1, v2, i;
282: int monthp, dayp, varp = 0;
283: struct match *matches = NULL, *tmp, *tmp2;
284: int interval = YEARLY; /* how frequently the event repeats. */
285: int vwd = 0; /* Variable weekday */
286: time_t tdiff, ttmp;
287: struct tm tmtmp;
1.1 millert 288:
289: /*
290: * CONVENTION
291: *
292: * Month: 1-12
293: * Monthname: Jan .. Dec
294: * Day: 1-31
295: * Weekday: Mon-Sun
296: *
297: */
298:
299: /* read first field */
300: /* didn't recognize anything, skip it */
301: if (!(v1 = getfield(endp, &endp, &flags)))
1.6 pjanzen 302: return (NULL);
1.1 millert 303:
1.12 mickey 304: /* adjust bodun rate */
305: if (bodun && !bodun_always)
306: bodun = !(arc4random() % 3);
307:
1.1 millert 308: /* Easter or Easter depending days */
1.7 pjanzen 309: if (flags & F_SPECIAL)
310: vwd = v1;
1.1 millert 311:
312: /*
313: * 1. {Weekday,Day} XYZ ...
314: *
315: * where Day is > 12
316: */
317: else if (flags & F_ISDAY || v1 > 12) {
318:
1.7 pjanzen 319: /* found a day; day: 13-31 or weekday: 1-7 */
1.1 millert 320: day = v1;
321:
322: /* {Day,Weekday} {Month,Monthname} ... */
1.7 pjanzen 323: /* if no recognizable month, assume just a day alone -- this is
324: * very unlikely and can only happen after the first 12 days.
325: * --find month or use current month */
326: if (!(month = getfield(endp, &endp, &flags))) {
1.1 millert 327: month = tp->tm_mon + 1;
1.7 pjanzen 328: /* F_ISDAY is set only if a weekday was spelled out */
329: /* F_ISDAY must be set if 0 < day < 8 */
330: if ((day <= 7) && (day >= 1))
331: interval = WEEKLY;
332: else
333: interval = MONTHLY;
334: } else if ((day <= 7) && (day >= 1))
335: day += 10;
336: /* it's a weekday; make it the first one of the month */
337: if (month == -1) {
338: month = tp->tm_mon + 1;
339: interval = MONTHLY;
1.16 mickey 340: } else if (calendar)
341: adjust_calendar(&day, &month);
1.7 pjanzen 342: if ((month > 12) || (month < 1))
343: return (NULL);
1.1 millert 344: }
345:
346: /* 2. {Monthname} XYZ ... */
347: else if (flags & F_ISMONTH) {
348: month = v1;
1.7 pjanzen 349: if (month == -1) {
350: month = tp->tm_mon + 1;
351: interval = MONTHLY;
352: }
1.1 millert 353: /* Monthname {day,weekday} */
354: /* if no recognizable day, assume the first day in month */
355: if (!(day = getfield(endp, &endp, &flags)))
356: day = 1;
1.7 pjanzen 357: /* If a weekday was spelled out without an ordering,
358: * assume the first of that day in the month */
1.16 mickey 359: if ((flags & F_ISDAY)) {
360: if ((day >= 1) && (day <=7))
361: day += 10;
362: } else if (calendar)
363: adjust_calendar(&day, &month);
1.1 millert 364: }
365:
366: /* Hm ... */
367: else {
368: v2 = getfield(endp, &endp, &flags);
369:
370: /*
371: * {Day} {Monthname} ...
372: * where Day <= 12
373: */
374: if (flags & F_ISMONTH) {
375: day = v1;
376: month = v2;
1.7 pjanzen 377: if (month == -1) {
378: month = tp->tm_mon + 1;
379: interval = MONTHLY;
1.16 mickey 380: } else if (calendar)
381: adjust_calendar(&day, &month);
1.1 millert 382: }
383:
384: /* {Month} {Weekday,Day} ... */
385: else {
386: /* F_ISDAY set, v2 > 12, or no way to tell */
387: month = v1;
388: /* if no recognizable day, assume the first */
389: day = v2 ? v2 : 1;
1.16 mickey 390: if ((flags & F_ISDAY)) {
391: if ((day >= 1) && (day <= 7))
392: day += 10;
393: } else
394: adjust_calendar(&day, &month);
1.1 millert 395: }
396: }
397:
398: /* convert Weekday into *next* Day,
399: * e.g.: 'Sunday' -> 22
1.5 pjanzen 400: * 'SundayLast' -> ??
1.1 millert 401: */
402: if (flags & F_ISDAY) {
403: #if DEBUG
1.7 pjanzen 404: fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
1.1 millert 405: #endif
406:
1.7 pjanzen 407: varp = 1;
408: /* variable weekday, SundayLast, MondayFirst ... */
409: if (day < 0 || day >= 10)
410: vwd = day;
411: else {
412: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
413: interval = WEEKLY;
414: }
415: } else
416: /* Check for silliness. Note we still catch Feb 29 */
417: if (!(flags & F_SPECIAL) &&
418: (day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
419: if (!((month == 2 && day == 29) ||
420: (interval == MONTHLY && day <= 31)))
421: return (NULL);
1.1 millert 422: }
423:
1.7 pjanzen 424: if (!(flags & F_SPECIAL)) {
425: monthp = month;
426: dayp = day;
427: day = cumdays[month] + day;
1.5 pjanzen 428: #if DEBUG
1.7 pjanzen 429: fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
1.5 pjanzen 430: #endif
1.7 pjanzen 431: /* Speed up processing for the most common situation: yearly events
432: * when the interval being checked is less than a month or so (this
433: * could be less than a year, but then we have to start worrying about
434: * leap years). Only one event can match, and it's easy to find.
435: * Note we can't check special events, because they can wander widely.
436: */
437: if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
438: memcpy(&tmtmp, tp, sizeof(struct tm));
439: tmtmp.tm_mday = dayp;
440: tmtmp.tm_mon = monthp - 1;
1.8 pjanzen 441: if (vwd) {
442: /* We want the event next year if it's late now
443: * this year. The 50-day limit means we don't have to
444: * worry if next year is or isn't a leap year.
445: */
446: if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
447: variable_weekday(&vwd, tmtmp.tm_mon + 1,
448: tmtmp.tm_year + TM_YEAR_BASE + 1);
449: else
450: variable_weekday(&vwd, tmtmp.tm_mon + 1,
451: tmtmp.tm_year + TM_YEAR_BASE);
452: day = cumdays[tmtmp.tm_mon + 1] + vwd;
453: tmtmp.tm_mday = vwd;
454: }
1.7 pjanzen 455: v2 = day - tp->tm_yday;
456: if ((v2 > v1) || (v2 < 0)) {
457: if ((v2 += isleap(tp->tm_year + TM_YEAR_BASE) ? 366 : 365)
458: <= v1)
459: tmtmp.tm_year++;
1.12 mickey 460: else if(!bodun || (day - tp->tm_yday) != -1)
1.7 pjanzen 461: return(NULL);
462: }
463: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 464: err(1, NULL);
1.13 mickey 465:
466: if (bodun && (day - tp->tm_yday) == -1) {
467: tmp->when = f_time - 1 * SECSPERDAY;
468: tmtmp.tm_mday++;
469: tmp->bodun = 1;
470: } else {
471: tmp->when = f_time + v2 * SECSPERDAY;
472: tmp->bodun = 0;
473: }
474:
1.7 pjanzen 475: (void)mktime(&tmtmp);
476: if (strftime(tmp->print_date,
477: sizeof(tmp->print_date),
478: /* "%a %b %d", &tm); Skip weekdays */
479: "%b %d", &tmtmp) == 0)
480: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.12 mickey 481:
1.7 pjanzen 482: tmp->var = varp;
483: tmp->next = NULL;
484: return(tmp);
485: }
1.16 mickey 486: } else {
1.7 pjanzen 487: varp = 1;
488: /* Set up v1 to the event number and ... */
489: v1 = vwd % (NUMEV + 1) - 1;
490: vwd /= (NUMEV + 1);
491: if (v1 < 0) {
492: v1 += NUMEV + 1;
493: vwd--;
494: }
495: dayp = monthp = 1; /* Why not */
1.1 millert 496: }
497:
1.7 pjanzen 498: /* Compare to past and coming instances of the event. The i == 0 part
499: * of the loop corresponds to this specific instance. Note that we
500: * can leave things sort of higgledy-piggledy since a mktime() happens
501: * on this before anything gets printed. Also note that even though
502: * we've effectively gotten rid of f_dayBefore, we still have to check
503: * the one prior event for situations like "the 31st of every month"
504: * and "yearly" events which could happen twice in one year but not in
505: * the next */
506: tmp2 = matches;
507: for (i = -1; i < 2; i++) {
508: memcpy(&tmtmp, tp, sizeof(struct tm));
509: tmtmp.tm_mday = dayp;
510: tmtmp.tm_mon = month = monthp - 1;
511: do {
512: v2 = 0;
513: switch (interval) {
514: case WEEKLY:
515: tmtmp.tm_mday += 7 * i;
516: break;
517: case MONTHLY:
518: month += i;
519: tmtmp.tm_mon = month;
520: switch(tmtmp.tm_mon) {
521: case -1:
522: tmtmp.tm_mon = month = 11;
523: tmtmp.tm_year--;
524: break;
525: case 12:
526: tmtmp.tm_mon = month = 0;
527: tmtmp.tm_year++;
528: break;
529: }
530: if (vwd) {
531: v1 = vwd;
532: variable_weekday(&v1, tmtmp.tm_mon + 1,
533: tmtmp.tm_year + TM_YEAR_BASE);
534: tmtmp.tm_mday = v1;
535: } else
536: tmtmp.tm_mday = dayp;
537: break;
538: case YEARLY:
539: default:
540: tmtmp.tm_year += i;
541: if (flags & F_SPECIAL) {
542: tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
543: tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
1.9 pjanzen 544: TM_YEAR_BASE) + vwd;
1.7 pjanzen 545: } else if (vwd) {
546: v1 = vwd;
547: variable_weekday(&v1, tmtmp.tm_mon + 1,
548: tmtmp.tm_year + TM_YEAR_BASE);
549: tmtmp.tm_mday = v1;
550: } else {
551: /* Need the following to keep Feb 29 from
552: * becoming Mar 1 */
553: tmtmp.tm_mday = dayp;
554: tmtmp.tm_mon = monthp - 1;
555: }
556: break;
557: }
558: /* How many days apart are we */
559: if ((ttmp = mktime(&tmtmp)) == -1)
560: warnx("time out of range: %s", endp);
561: else {
562: tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
1.12 mickey 563: if (tdiff <= offset + f_dayAfter ||
564: (bodun && tdiff == -1)) {
565: if (tdiff >= 0 ||
566: (bodun && tdiff == -1)) {
1.7 pjanzen 567: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 568: err(1, NULL);
1.7 pjanzen 569: tmp->when = ttmp;
570: if (strftime(tmp->print_date,
571: sizeof(tmp->print_date),
572: /* "%a %b %d", &tm); Skip weekdays */
573: "%b %d", &tmtmp) == 0)
574: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.13 mickey 575: tmp->bodun = bodun && tdiff == -1;
1.7 pjanzen 576: tmp->var = varp;
577: tmp->next = NULL;
578: if (tmp2)
579: tmp2->next = tmp;
580: else
581: matches = tmp;
582: tmp2 = tmp;
583: v2 = (i == 1) ? 1 : 0;
584: }
585: } else
586: i = 2; /* No point checking in the future */
587: }
588: } while (v2 != 0);
1.6 pjanzen 589: }
1.7 pjanzen 590: return (matches);
1.1 millert 591: }
592:
593:
594: int
595: getmonth(s)
1.14 mpech 596: char *s;
1.1 millert 597: {
1.14 mpech 598: char **p;
1.1 millert 599: struct fixs *n;
600:
601: for (n = fnmonths; n->name; ++n)
602: if (!strncasecmp(s, n->name, n->len))
603: return ((n - fnmonths) + 1);
604: for (n = nmonths; n->name; ++n)
605: if (!strncasecmp(s, n->name, n->len))
606: return ((n - nmonths) + 1);
607: for (p = months; *p; ++p)
608: if (!strncasecmp(s, *p, 3))
609: return ((p - months) + 1);
610: return (0);
611: }
612:
613:
614: int
615: getday(s)
1.14 mpech 616: char *s;
1.1 millert 617: {
1.14 mpech 618: char **p;
1.1 millert 619: struct fixs *n;
620:
621: for (n = fndays; n->name; ++n)
622: if (!strncasecmp(s, n->name, n->len))
623: return ((n - fndays) + 1);
624: for (n = ndays; n->name; ++n)
625: if (!strncasecmp(s, n->name, n->len))
626: return ((n - ndays) + 1);
627: for (p = days; *p; ++p)
628: if (!strncasecmp(s, *p, 3))
629: return ((p - days) + 1);
630: return (0);
631: }
632:
633: /* return offset for variable weekdays
634: * -1 -> last weekday in month
635: * +1 -> first weekday in month
636: * ... etc ...
637: */
638: int
639: getdayvar(s)
1.14 mpech 640: char *s;
1.1 millert 641: {
1.14 mpech 642: int offset;
1.1 millert 643:
644:
645: offset = strlen(s);
646:
647: /* Sun+1 or Wednesday-2
648: * ^ ^ */
649:
650: /* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
651: switch(*(s + offset - 2)) {
652: case '-':
653: case '+':
1.7 pjanzen 654: return(atoi(s + offset - 2));
1.1 millert 655: break;
656: }
657:
658: /*
659: * some aliases: last, first, second, third, fourth
660: */
661:
662: /* last */
663: if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
664: return(-1);
665: else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
666: return(+1);
667: else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
668: return(+2);
669: else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
670: return(+3);
671: else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
672: return(+4);
673:
674: /* no offset detected */
675: return(0);
1.7 pjanzen 676: }
677:
678:
679: int
680: foy(year)
681: int year;
682: {
683: /* 0-6; what weekday Jan 1 is */
684: year--;
685: return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
686: }
687:
688:
689:
690: void
691: variable_weekday(day, month, year)
692: int *day, month, year;
693: {
694: int v1, v2;
695: int *cumdays;
696: int day1;
697:
698: if (isleap(year))
699: cumdays = daytab[1];
700: else
701: cumdays = daytab[0];
702: day1 = foy(year);
703: /* negative offset; last, -4 .. -1 */
704: if (*day < 0) {
705: v1 = *day/10 - 1; /* offset -4 ... -1 */
706: *day = 10 + (*day % 10); /* day 1 ... 7 */
707:
708: /* which weekday the end of the month is (1-7) */
709: v2 = (cumdays[month + 1] + day1) % 7 + 1;
710:
711: /* and subtract enough days */
712: *day = cumdays[month + 1] - cumdays[month] +
713: (v1 + 1) * 7 - (v2 - *day + 7) % 7;
714: #if DEBUG
715: fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
716: #endif
717: }
718:
719: /* first, second ... +1 ... +5 */
720: else {
721: v1 = *day/10; /* offset */
722: *day = *day % 10;
723:
724: /* which weekday the first of the month is (1-7) */
725: v2 = (cumdays[month] + 1 + day1) % 7 + 1;
726:
727: /* and add enough days */
728: *day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
729: #if DEBUG
730: fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
731: #endif
732: }
1.1 millert 733: }
![[BACK]](/icons/back.gif){kind=icon}
Return to day.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / calendar