Annotation of src/usr.bin/calendar/day.c, Revision 1.29
1.29 ! millert 1: /* $OpenBSD: day.c,v 1.28 2015/03/15 00:41:28 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
81: setnnames(void)
1.1 millert 82: {
83: char buf[80];
84: int i, l;
85: struct tm tm;
86:
87: for (i = 0; i < 7; i++) {
88: tm.tm_wday = i;
1.3 millert 89: l = strftime(buf, sizeof(buf), "%a", &tm);
1.27 deraadt 90: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 91: ;
92: buf[l] = '\0';
93: if (ndays[i].name != NULL)
94: free(ndays[i].name);
95: if ((ndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 96: err(1, NULL);
1.1 millert 97: ndays[i].len = strlen(buf);
98:
1.3 millert 99: l = strftime(buf, sizeof(buf), "%A", &tm);
1.27 deraadt 100: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 101: ;
102: buf[l] = '\0';
103: if (fndays[i].name != NULL)
104: free(fndays[i].name);
105: if ((fndays[i].name = strdup(buf)) == NULL)
1.11 pjanzen 106: err(1, NULL);
1.1 millert 107: fndays[i].len = strlen(buf);
108: }
109:
110: for (i = 0; i < 12; i++) {
111: tm.tm_mon = i;
1.3 millert 112: l = strftime(buf, sizeof(buf), "%b", &tm);
1.27 deraadt 113: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 114: ;
115: buf[l] = '\0';
116: if (nmonths[i].name != NULL)
117: free(nmonths[i].name);
118: if ((nmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 119: err(1, NULL);
1.1 millert 120: nmonths[i].len = strlen(buf);
121:
1.3 millert 122: l = strftime(buf, sizeof(buf), "%B", &tm);
1.27 deraadt 123: for (; l > 0 && isspace((unsigned char)buf[l - 1]); l--)
1.1 millert 124: ;
125: buf[l] = '\0';
126: if (fnmonths[i].name != NULL)
127: free(fnmonths[i].name);
128: if ((fnmonths[i].name = strdup(buf)) == NULL)
1.11 pjanzen 129: err(1, NULL);
1.1 millert 130: fnmonths[i].len = strlen(buf);
131: }
1.7 pjanzen 132: /* Hardwired special events */
1.18 mickey 133: spev[0].name = strdup(PESACH);
134: spev[0].nlen = PESACHLEN;
135: spev[0].getev = pesach;
136: spev[1].name = strdup(EASTER);
137: spev[1].nlen = EASTERNAMELEN;
138: spev[1].getev = easter;
139: spev[2].name = strdup(PASKHA);
140: spev[2].nlen = PASKHALEN;
141: spev[2].getev = paskha;
1.7 pjanzen 142: for (i = 0; i < NUMEV; i++) {
143: if (spev[i].name == NULL)
1.11 pjanzen 144: err(1, NULL);
1.7 pjanzen 145: spev[i].uname = NULL;
146: }
1.1 millert 147: }
148:
149: void
1.20 deraadt 150: settime(time_t *now)
1.1 millert 151: {
1.7 pjanzen 152: tp = localtime(now);
153: tp->tm_sec = 0;
154: tp->tm_min = 0;
155: /* Avoid getting caught by a timezone shift; set time to noon */
156: tp->tm_isdst = 0;
157: tp->tm_hour = 12;
158: *now = mktime(tp);
1.29 ! millert 159: if (isleap(tp->tm_year + 1900))
1.1 millert 160: cumdays = daytab[1];
1.7 pjanzen 161: else
1.1 millert 162: cumdays = daytab[0];
163: /* Friday displays Monday's events */
164: offset = tp->tm_wday == 5 ? 3 : 1;
1.19 mickey 165: if (f_SetdayAfter)
1.7 pjanzen 166: offset = 0; /* Except not when range is set explicitly */
1.1 millert 167: header[5].iov_base = dayname;
168:
169: (void) setlocale(LC_TIME, "C");
170: header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
171: (void) setlocale(LC_TIME, "");
172:
173: setnnames();
174: }
175:
1.2 millert 176: /* convert [Year][Month]Day into unix time (since 1970)
177: * Year: two or four digits, Month: two digits, Day: two digits
1.1 millert 178: */
1.20 deraadt 179: time_t
180: Mktime(char *date)
1.1 millert 181: {
1.20 deraadt 182: time_t t;
183: int len;
184: struct tm tm;
1.1 millert 185:
1.20 deraadt 186: (void)time(&t);
187: tp = localtime(&t);
188:
189: len = strlen(date);
190: if (len < 2)
191: return((time_t)-1);
1.25 deraadt 192: bzero(&tm, sizeof tm);
1.20 deraadt 193: tm.tm_sec = 0;
194: tm.tm_min = 0;
195: /* Avoid getting caught by a timezone shift; set time to noon */
196: tm.tm_isdst = 0;
197: tm.tm_hour = 12;
198: tm.tm_wday = 0;
199: tm.tm_mday = tp->tm_mday;
200: tm.tm_mon = tp->tm_mon;
201: tm.tm_year = tp->tm_year;
202:
203: /* Day */
204: tm.tm_mday = atoi(date + len - 2);
205:
206: /* Month */
207: if (len >= 4) {
208: *(date + len - 2) = '\0';
209: tm.tm_mon = atoi(date + len - 4) - 1;
210: }
211:
212: /* Year */
213: if (len >= 6) {
1.7 pjanzen 214: *(date + len - 4) = '\0';
215: tm.tm_year = atoi(date);
1.1 millert 216:
1.20 deraadt 217: if (tm.tm_year < 69) /* Y2K */
1.29 ! millert 218: tm.tm_year += 100;
! 219: else if (tm.tm_year > 1900)
! 220: tm.tm_year -= 1900;
1.20 deraadt 221: }
1.1 millert 222:
223: #if DEBUG
1.24 deraadt 224: printf("Mktime: %d %lld %d %s\n", (int)mktime(&tm), (long long)t, len,
1.20 deraadt 225: asctime(&tm));
1.1 millert 226: #endif
1.20 deraadt 227: return(mktime(&tm));
1.1 millert 228: }
229:
1.26 deraadt 230: static void
1.16 mickey 231: adjust_calendar(int *day, int *month)
232: {
233: switch (calendar) {
234: case GREGORIAN:
235: break;
236:
237: case JULIAN:
238: *day += julian;
239: if (*day > (cumdays[*month + 1] - cumdays[*month])) {
240: *day -= (cumdays[*month + 1] - cumdays[*month]);
241: if (++*month > 12)
242: *month = 1;
243: }
244: break;
245: case LUNAR:
246: break;
247: }
248: }
249:
1.1 millert 250: /*
251: * Possible date formats include any combination of:
252: * 3-charmonth (January, Jan, Jan)
253: * 3-charweekday (Friday, Monday, mon.)
254: * numeric month or day (1, 2, 04)
255: *
1.10 pjanzen 256: * Any character except \t or '*' may separate them, or they may not be
257: * separated. Any line following a line that is matched, that starts
258: * with \t, is shown along with the matched line.
1.1 millert 259: */
1.6 pjanzen 260: struct match *
1.20 deraadt 261: isnow(char *endp, int bodun)
1.1 millert 262: {
1.7 pjanzen 263: int day = 0, flags = 0, month = 0, v1, v2, i;
264: int monthp, dayp, varp = 0;
265: struct match *matches = NULL, *tmp, *tmp2;
266: int interval = YEARLY; /* how frequently the event repeats. */
267: int vwd = 0; /* Variable weekday */
268: time_t tdiff, ttmp;
269: struct tm tmtmp;
1.1 millert 270:
271: /*
272: * CONVENTION
273: *
274: * Month: 1-12
275: * Monthname: Jan .. Dec
276: * Day: 1-31
277: * Weekday: Mon-Sun
278: *
279: */
280:
281: /* read first field */
282: /* didn't recognize anything, skip it */
283: if (!(v1 = getfield(endp, &endp, &flags)))
1.6 pjanzen 284: return (NULL);
1.1 millert 285:
1.12 mickey 286: /* adjust bodun rate */
287: if (bodun && !bodun_always)
1.21 djm 288: bodun = !arc4random_uniform(3);
1.12 mickey 289:
1.1 millert 290: /* Easter or Easter depending days */
1.7 pjanzen 291: if (flags & F_SPECIAL)
292: vwd = v1;
1.1 millert 293:
294: /*
295: * 1. {Weekday,Day} XYZ ...
296: *
297: * where Day is > 12
298: */
299: else if (flags & F_ISDAY || v1 > 12) {
300:
1.7 pjanzen 301: /* found a day; day: 13-31 or weekday: 1-7 */
1.1 millert 302: day = v1;
303:
304: /* {Day,Weekday} {Month,Monthname} ... */
1.7 pjanzen 305: /* if no recognizable month, assume just a day alone -- this is
306: * very unlikely and can only happen after the first 12 days.
307: * --find month or use current month */
308: if (!(month = getfield(endp, &endp, &flags))) {
1.1 millert 309: month = tp->tm_mon + 1;
1.7 pjanzen 310: /* F_ISDAY is set only if a weekday was spelled out */
311: /* F_ISDAY must be set if 0 < day < 8 */
312: if ((day <= 7) && (day >= 1))
313: interval = WEEKLY;
314: else
315: interval = MONTHLY;
316: } else if ((day <= 7) && (day >= 1))
317: day += 10;
318: /* it's a weekday; make it the first one of the month */
319: if (month == -1) {
320: month = tp->tm_mon + 1;
321: interval = MONTHLY;
1.16 mickey 322: } else if (calendar)
323: adjust_calendar(&day, &month);
1.7 pjanzen 324: if ((month > 12) || (month < 1))
325: return (NULL);
1.1 millert 326: }
327:
328: /* 2. {Monthname} XYZ ... */
329: else if (flags & F_ISMONTH) {
330: month = v1;
1.7 pjanzen 331: if (month == -1) {
332: month = tp->tm_mon + 1;
333: interval = MONTHLY;
334: }
1.1 millert 335: /* Monthname {day,weekday} */
336: /* if no recognizable day, assume the first day in month */
337: if (!(day = getfield(endp, &endp, &flags)))
338: day = 1;
1.7 pjanzen 339: /* If a weekday was spelled out without an ordering,
340: * assume the first of that day in the month */
1.16 mickey 341: if ((flags & F_ISDAY)) {
342: if ((day >= 1) && (day <=7))
343: day += 10;
344: } else if (calendar)
345: adjust_calendar(&day, &month);
1.1 millert 346: }
347:
348: /* Hm ... */
349: else {
350: v2 = getfield(endp, &endp, &flags);
351:
352: /*
353: * {Day} {Monthname} ...
354: * where Day <= 12
355: */
356: if (flags & F_ISMONTH) {
357: day = v1;
358: month = v2;
1.7 pjanzen 359: if (month == -1) {
360: month = tp->tm_mon + 1;
361: interval = MONTHLY;
1.16 mickey 362: } else if (calendar)
363: adjust_calendar(&day, &month);
1.1 millert 364: }
365:
366: /* {Month} {Weekday,Day} ... */
367: else {
368: /* F_ISDAY set, v2 > 12, or no way to tell */
369: month = v1;
370: /* if no recognizable day, assume the first */
371: day = v2 ? v2 : 1;
1.16 mickey 372: if ((flags & F_ISDAY)) {
373: if ((day >= 1) && (day <= 7))
374: day += 10;
375: } else
376: adjust_calendar(&day, &month);
1.1 millert 377: }
378: }
379:
380: /* convert Weekday into *next* Day,
381: * e.g.: 'Sunday' -> 22
1.5 pjanzen 382: * 'SundayLast' -> ??
1.1 millert 383: */
384: if (flags & F_ISDAY) {
385: #if DEBUG
1.7 pjanzen 386: fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
1.1 millert 387: #endif
388:
1.7 pjanzen 389: varp = 1;
390: /* variable weekday, SundayLast, MondayFirst ... */
391: if (day < 0 || day >= 10)
392: vwd = day;
393: else {
394: day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
395: interval = WEEKLY;
396: }
397: } else
398: /* Check for silliness. Note we still catch Feb 29 */
399: if (!(flags & F_SPECIAL) &&
400: (day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
401: if (!((month == 2 && day == 29) ||
402: (interval == MONTHLY && day <= 31)))
403: return (NULL);
1.1 millert 404: }
405:
1.7 pjanzen 406: if (!(flags & F_SPECIAL)) {
407: monthp = month;
408: dayp = day;
409: day = cumdays[month] + day;
1.5 pjanzen 410: #if DEBUG
1.7 pjanzen 411: fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
1.5 pjanzen 412: #endif
1.7 pjanzen 413: /* Speed up processing for the most common situation: yearly events
414: * when the interval being checked is less than a month or so (this
415: * could be less than a year, but then we have to start worrying about
416: * leap years). Only one event can match, and it's easy to find.
417: * Note we can't check special events, because they can wander widely.
418: */
419: if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
420: memcpy(&tmtmp, tp, sizeof(struct tm));
421: tmtmp.tm_mday = dayp;
422: tmtmp.tm_mon = monthp - 1;
1.8 pjanzen 423: if (vwd) {
424: /* We want the event next year if it's late now
425: * this year. The 50-day limit means we don't have to
426: * worry if next year is or isn't a leap year.
427: */
428: if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
429: variable_weekday(&vwd, tmtmp.tm_mon + 1,
1.29 ! millert 430: tmtmp.tm_year + 1900 + 1);
1.8 pjanzen 431: else
432: variable_weekday(&vwd, tmtmp.tm_mon + 1,
1.29 ! millert 433: tmtmp.tm_year + 1900);
1.8 pjanzen 434: day = cumdays[tmtmp.tm_mon + 1] + vwd;
435: tmtmp.tm_mday = vwd;
436: }
1.7 pjanzen 437: v2 = day - tp->tm_yday;
438: if ((v2 > v1) || (v2 < 0)) {
1.29 ! millert 439: if ((v2 += isleap(tp->tm_year + 1900) ? 366 : 365)
1.7 pjanzen 440: <= v1)
441: tmtmp.tm_year++;
1.12 mickey 442: else if(!bodun || (day - tp->tm_yday) != -1)
1.7 pjanzen 443: return(NULL);
444: }
445: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 446: err(1, NULL);
1.13 mickey 447:
448: if (bodun && (day - tp->tm_yday) == -1) {
449: tmp->when = f_time - 1 * SECSPERDAY;
450: tmtmp.tm_mday++;
451: tmp->bodun = 1;
452: } else {
453: tmp->when = f_time + v2 * SECSPERDAY;
454: tmp->bodun = 0;
455: }
456:
1.7 pjanzen 457: (void)mktime(&tmtmp);
458: if (strftime(tmp->print_date,
459: sizeof(tmp->print_date),
460: /* "%a %b %d", &tm); Skip weekdays */
461: "%b %d", &tmtmp) == 0)
462: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.12 mickey 463:
1.7 pjanzen 464: tmp->var = varp;
465: tmp->next = NULL;
466: return(tmp);
467: }
1.16 mickey 468: } else {
1.7 pjanzen 469: varp = 1;
470: /* Set up v1 to the event number and ... */
471: v1 = vwd % (NUMEV + 1) - 1;
472: vwd /= (NUMEV + 1);
473: if (v1 < 0) {
474: v1 += NUMEV + 1;
475: vwd--;
476: }
477: dayp = monthp = 1; /* Why not */
1.1 millert 478: }
479:
1.7 pjanzen 480: /* Compare to past and coming instances of the event. The i == 0 part
481: * of the loop corresponds to this specific instance. Note that we
482: * can leave things sort of higgledy-piggledy since a mktime() happens
483: * on this before anything gets printed. Also note that even though
484: * we've effectively gotten rid of f_dayBefore, we still have to check
485: * the one prior event for situations like "the 31st of every month"
486: * and "yearly" events which could happen twice in one year but not in
487: * the next */
488: tmp2 = matches;
489: for (i = -1; i < 2; i++) {
490: memcpy(&tmtmp, tp, sizeof(struct tm));
491: tmtmp.tm_mday = dayp;
492: tmtmp.tm_mon = month = monthp - 1;
493: do {
494: v2 = 0;
495: switch (interval) {
496: case WEEKLY:
497: tmtmp.tm_mday += 7 * i;
498: break;
499: case MONTHLY:
500: month += i;
501: tmtmp.tm_mon = month;
502: switch(tmtmp.tm_mon) {
503: case -1:
504: tmtmp.tm_mon = month = 11;
505: tmtmp.tm_year--;
506: break;
507: case 12:
508: tmtmp.tm_mon = month = 0;
509: tmtmp.tm_year++;
510: break;
511: }
512: if (vwd) {
513: v1 = vwd;
514: variable_weekday(&v1, tmtmp.tm_mon + 1,
1.29 ! millert 515: tmtmp.tm_year + 1900);
1.7 pjanzen 516: tmtmp.tm_mday = v1;
517: } else
518: tmtmp.tm_mday = dayp;
519: break;
520: case YEARLY:
521: default:
522: tmtmp.tm_year += i;
523: if (flags & F_SPECIAL) {
524: tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
525: tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
1.29 ! millert 526: 1900) + vwd;
1.7 pjanzen 527: } else if (vwd) {
528: v1 = vwd;
529: variable_weekday(&v1, tmtmp.tm_mon + 1,
1.29 ! millert 530: tmtmp.tm_year + 1900);
1.7 pjanzen 531: tmtmp.tm_mday = v1;
532: } else {
533: /* Need the following to keep Feb 29 from
534: * becoming Mar 1 */
535: tmtmp.tm_mday = dayp;
536: tmtmp.tm_mon = monthp - 1;
537: }
538: break;
539: }
540: /* How many days apart are we */
541: if ((ttmp = mktime(&tmtmp)) == -1)
542: warnx("time out of range: %s", endp);
543: else {
544: tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
1.12 mickey 545: if (tdiff <= offset + f_dayAfter ||
546: (bodun && tdiff == -1)) {
547: if (tdiff >= 0 ||
548: (bodun && tdiff == -1)) {
1.7 pjanzen 549: if ((tmp = malloc(sizeof(struct match))) == NULL)
1.11 pjanzen 550: err(1, NULL);
1.7 pjanzen 551: tmp->when = ttmp;
552: if (strftime(tmp->print_date,
553: sizeof(tmp->print_date),
554: /* "%a %b %d", &tm); Skip weekdays */
555: "%b %d", &tmtmp) == 0)
556: tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
1.13 mickey 557: tmp->bodun = bodun && tdiff == -1;
1.7 pjanzen 558: tmp->var = varp;
559: tmp->next = NULL;
560: if (tmp2)
561: tmp2->next = tmp;
562: else
563: matches = tmp;
564: tmp2 = tmp;
565: v2 = (i == 1) ? 1 : 0;
566: }
567: } else
568: i = 2; /* No point checking in the future */
569: }
570: } while (v2 != 0);
1.6 pjanzen 571: }
1.7 pjanzen 572: return (matches);
1.1 millert 573: }
574:
575:
576: int
1.20 deraadt 577: getmonth(char *s)
1.1 millert 578: {
1.14 mpech 579: char **p;
1.1 millert 580: struct fixs *n;
581:
582: for (n = fnmonths; n->name; ++n)
583: if (!strncasecmp(s, n->name, n->len))
584: return ((n - fnmonths) + 1);
585: for (n = nmonths; n->name; ++n)
586: if (!strncasecmp(s, n->name, n->len))
587: return ((n - nmonths) + 1);
588: for (p = months; *p; ++p)
589: if (!strncasecmp(s, *p, 3))
590: return ((p - months) + 1);
591: return (0);
592: }
593:
594:
595: int
1.20 deraadt 596: getday(char *s)
1.1 millert 597: {
1.14 mpech 598: char **p;
1.1 millert 599: struct fixs *n;
600:
601: for (n = fndays; n->name; ++n)
602: if (!strncasecmp(s, n->name, n->len))
603: return ((n - fndays) + 1);
604: for (n = ndays; n->name; ++n)
605: if (!strncasecmp(s, n->name, n->len))
606: return ((n - ndays) + 1);
607: for (p = days; *p; ++p)
608: if (!strncasecmp(s, *p, 3))
609: return ((p - days) + 1);
610: return (0);
611: }
612:
613: /* return offset for variable weekdays
614: * -1 -> last weekday in month
615: * +1 -> first weekday in month
616: * ... etc ...
617: */
618: int
1.20 deraadt 619: getdayvar(char *s)
1.1 millert 620: {
1.14 mpech 621: int offset;
1.1 millert 622:
623:
624: offset = strlen(s);
625:
626: /* Sun+1 or Wednesday-2
627: * ^ ^ */
628:
629: /* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
630: switch(*(s + offset - 2)) {
631: case '-':
632: case '+':
1.7 pjanzen 633: return(atoi(s + offset - 2));
1.1 millert 634: break;
635: }
636:
637: /*
638: * some aliases: last, first, second, third, fourth
639: */
640:
641: /* last */
642: if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
643: return(-1);
644: else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
645: return(+1);
646: else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
647: return(+2);
648: else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
649: return(+3);
650: else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
651: return(+4);
652:
653: /* no offset detected */
654: return(0);
1.7 pjanzen 655: }
656:
657:
658: int
1.20 deraadt 659: foy(int year)
1.7 pjanzen 660: {
661: /* 0-6; what weekday Jan 1 is */
662: year--;
663: return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
664: }
665:
666:
667:
668: void
1.20 deraadt 669: variable_weekday(int *day, int month, int year)
1.7 pjanzen 670: {
671: int v1, v2;
672: int *cumdays;
673: int day1;
674:
675: if (isleap(year))
676: cumdays = daytab[1];
677: else
678: cumdays = daytab[0];
679: day1 = foy(year);
680: /* negative offset; last, -4 .. -1 */
681: if (*day < 0) {
682: v1 = *day/10 - 1; /* offset -4 ... -1 */
683: *day = 10 + (*day % 10); /* day 1 ... 7 */
684:
685: /* which weekday the end of the month is (1-7) */
686: v2 = (cumdays[month + 1] + day1) % 7 + 1;
687:
688: /* and subtract enough days */
689: *day = cumdays[month + 1] - cumdays[month] +
690: (v1 + 1) * 7 - (v2 - *day + 7) % 7;
691: #if DEBUG
692: fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
693: #endif
694: }
695:
696: /* first, second ... +1 ... +5 */
697: else {
698: v1 = *day/10; /* offset */
699: *day = *day % 10;
700:
701: /* which weekday the first of the month is (1-7) */
702: v2 = (cumdays[month] + 1 + day1) % 7 + 1;
703:
704: /* and add enough days */
705: *day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
706: #if DEBUG
707: fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
708: #endif
709: }
1.1 millert 710: }
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