xref: /freebsd/usr.bin/calendar/day.c (revision ae83180158c4c937f170e31eff311b18c0286a93)
1 /*
2  * Copyright (c) 1989, 1993, 1994
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
36 
37 #include <sys/types.h>
38 #include <sys/uio.h>
39 #include <ctype.h>
40 #include <err.h>
41 #include <locale.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <time.h>
46 
47 #include "pathnames.h"
48 #include "calendar.h"
49 
50 struct tm *tp;
51 int *cumdays, offset, yrdays;
52 char dayname[10];
53 
54 
55 /* 1-based month, 0-based days, cumulative */
56 int daytab[][14] = {
57 	{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
58 	{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
59 };
60 
61 static char const *days[] = {
62 	"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
63 };
64 
65 static const char *months[] = {
66 	"jan", "feb", "mar", "apr", "may", "jun",
67 	"jul", "aug", "sep", "oct", "nov", "dec", NULL,
68 };
69 
70 static struct fixs fndays[8];         /* full national days names */
71 static struct fixs ndays[8];          /* short national days names */
72 
73 static struct fixs fnmonths[13];      /* full national months names */
74 static struct fixs nmonths[13];       /* short national month names */
75 
76 
77 void setnnames(void)
78 {
79 	char buf[80];
80 	int i, l;
81 	struct tm tm;
82 
83 	for (i = 0; i < 7; i++) {
84 		tm.tm_wday = i;
85 		strftime(buf, sizeof(buf), "%a", &tm);
86 		for (l = strlen(buf);
87 		     l > 0 && isspace((unsigned char)buf[l - 1]);
88 		     l--)
89 			;
90 		buf[l] = '\0';
91 		if (ndays[i].name != NULL)
92 			free(ndays[i].name);
93 		if ((ndays[i].name = strdup(buf)) == NULL)
94 			errx(1, "cannot allocate memory");
95 		ndays[i].len = strlen(buf);
96 
97 		strftime(buf, sizeof(buf), "%A", &tm);
98 		for (l = strlen(buf);
99 		     l > 0 && isspace((unsigned char)buf[l - 1]);
100 		     l--)
101 			;
102 		buf[l] = '\0';
103 		if (fndays[i].name != NULL)
104 			free(fndays[i].name);
105 		if ((fndays[i].name = strdup(buf)) == NULL)
106 			errx(1, "cannot allocate memory");
107 		fndays[i].len = strlen(buf);
108 	}
109 
110 	for (i = 0; i < 12; i++) {
111 		tm.tm_mon = i;
112 		strftime(buf, sizeof(buf), "%b", &tm);
113 		for (l = strlen(buf);
114 		     l > 0 && isspace((unsigned char)buf[l - 1]);
115 		     l--)
116 			;
117 		buf[l] = '\0';
118 		if (nmonths[i].name != NULL)
119 			free(nmonths[i].name);
120 		if ((nmonths[i].name = strdup(buf)) == NULL)
121 			errx(1, "cannot allocate memory");
122 		nmonths[i].len = strlen(buf);
123 
124 		strftime(buf, sizeof(buf), "%B", &tm);
125 		for (l = strlen(buf);
126 		     l > 0 && isspace((unsigned char)buf[l - 1]);
127 		     l--)
128 			;
129 		buf[l] = '\0';
130 		if (fnmonths[i].name != NULL)
131 			free(fnmonths[i].name);
132 		if ((fnmonths[i].name = strdup(buf)) == NULL)
133 			errx(1, "cannot allocate memory");
134 		fnmonths[i].len = strlen(buf);
135 	}
136 }
137 
138 void
139 settime(now)
140     	time_t now;
141 {
142 	char *oldl, *lbufp;
143 
144 	tp = localtime(&now);
145 	if ( isleap(tp->tm_year + 1900) ) {
146 		yrdays = 366;
147 		cumdays = daytab[1];
148 	} else {
149 		yrdays = 365;
150 		cumdays = daytab[0];
151 	}
152 	/* Friday displays Monday's events */
153 	offset = tp->tm_wday == Friday ? 3 : 1;
154 	header[5].iov_base = dayname;
155 
156 	oldl = NULL;
157 	lbufp = setlocale(LC_TIME, NULL);
158 	if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
159 		errx(1, "cannot allocate memory");
160 	(void) setlocale(LC_TIME, "C");
161 	header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
162 	(void) setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
163 	if (oldl != NULL)
164 		free(oldl);
165 
166 	setnnames();
167 }
168 
169 /* convert Day[/Month][/Year] into unix time (since 1970)
170  * Day: two digits, Month: two digits, Year: digits
171  */
172 time_t Mktime (dp)
173     char *dp;
174 {
175     time_t t;
176     int d, m, y;
177     struct tm tm;
178 
179     (void)time(&t);
180     tp = localtime(&t);
181 
182     tm.tm_sec = 0;
183     tm.tm_min = 0;
184     tm.tm_hour = 0;
185     tm.tm_wday = 0;
186     tm.tm_mday = tp->tm_mday;
187     tm.tm_mon = tp->tm_mon;
188     tm.tm_year = tp->tm_year;
189 
190     switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
191     case 3:
192 	if (y > 1900)
193 	    y -= 1900;
194 	tm.tm_year = y;
195 	/* FALLTHROUGH */
196     case 2:
197 	tm.tm_mon = m - 1;
198 	/* FALLTHROUGH */
199     case 1:
200 	tm.tm_mday = d;
201     }
202 
203 #ifdef DEBUG
204     fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
205 	   asctime(&tm));
206 #endif
207     return(mktime(&tm));
208 }
209 
210 /*
211  * Possible date formats include any combination of:
212  *	3-charmonth			(January, Jan, Jan)
213  *	3-charweekday			(Friday, Monday, mon.)
214  *	numeric month or day		(1, 2, 04)
215  *
216  * Any character may separate them, or they may not be separated.  Any line,
217  * following a line that is matched, that starts with "whitespace", is shown
218  * along with the matched line.
219  */
220 int
221 isnow(endp, monthp, dayp, varp)
222 	char *endp;
223 	int	*monthp;
224 	int	*dayp;
225 	int	*varp;
226 {
227 	int day, flags, month = 0, v1, v2;
228 
229 	/*
230 	 * CONVENTION
231 	 *
232 	 * Month:     1-12
233 	 * Monthname: Jan .. Dec
234 	 * Day:       1-31
235 	 * Weekday:   Mon-Sun
236 	 *
237 	 */
238 
239 	flags = 0;
240 
241 	/* read first field */
242 	/* didn't recognize anything, skip it */
243 	if (!(v1 = getfield(endp, &endp, &flags)))
244 		return (0);
245 
246 	/* Easter or Easter depending days */
247 	if (flags & F_EASTER)
248 	    day = v1 - 1; /* days since January 1 [0-365] */
249 
250 	 /*
251 	  * 1. {Weekday,Day} XYZ ...
252 	  *
253 	  *    where Day is > 12
254 	  */
255 	else if (flags & F_ISDAY || v1 > 12) {
256 
257 		/* found a day; day: 1-31 or weekday: 1-7 */
258 		day = v1;
259 
260 		/* {Day,Weekday} {Month,Monthname} ... */
261 		/* if no recognizable month, assume just a day alone
262 		 * in other words, find month or use current month */
263 		if (!(month = getfield(endp, &endp, &flags)))
264 			month = tp->tm_mon + 1;
265 	}
266 
267 	/* 2. {Monthname} XYZ ... */
268 	else if (flags & F_ISMONTH) {
269 		month = v1;
270 
271 		/* Monthname {day,weekday} */
272 		/* if no recognizable day, assume the first day in month */
273 		if (!(day = getfield(endp, &endp, &flags)))
274 			day = 1;
275 	}
276 
277 	/* Hm ... */
278 	else {
279 		v2 = getfield(endp, &endp, &flags);
280 
281 		/*
282 		 * {Day} {Monthname} ...
283 		 * where Day <= 12
284 		 */
285 		if (flags & F_ISMONTH) {
286 			day = v1;
287 			month = v2;
288 			*varp = 0;
289 		}
290 
291 		/* {Month} {Weekday,Day} ...  */
292 		else {
293 			/* F_ISDAY set, v2 > 12, or no way to tell */
294 			month = v1;
295 			/* if no recognizable day, assume the first */
296 			day = v2 ? v2 : 1;
297 			*varp = 0;
298 		}
299 	}
300 
301 	/* convert Weekday into *next*  Day,
302 	 * e.g.: 'Sunday' -> 22
303 	 *       'SundayLast' -> ??
304 	 */
305 	if (flags & F_ISDAY) {
306 #ifdef DEBUG
307 	    fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
308 #endif
309 
310 	    *varp = 1;
311 	    /* variable weekday, SundayLast, MondayFirst ... */
312 	    if (day < 0 || day >= 10) {
313 
314 		/* negative offset; last, -4 .. -1 */
315 		if (day < 0) {
316 		    v1 = day/10 - 1;          /* offset -4 ... -1 */
317 	            day = 10 + (day % 10);    /* day 1 ... 7 */
318 
319 		    /* day, eg '22nd' */
320 		    v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
321 
322 		    /* (month length - day) / 7 + 1 */
323 		    if (cumdays[month+1] - cumdays[month] >= v2
324 			&& ((int)((cumdays[month+1] -
325 		               cumdays[month] - v2) / 7) + 1) == -v1)
326 			/* bingo ! */
327 			day = v2;
328 
329 		    /* set to yesterday */
330 		    else {
331 			day = tp->tm_mday - 1;
332 			if (day == 0)
333 			    return (0);
334 		    }
335 		}
336 
337 		/* first, second ... +1 ... +5 */
338 		else {
339 		    v1 = day/10;        /* offset: +1 (first Sunday) ... */
340 		    day = day % 10;
341 
342 		    /* day, eg '22th' */
343 		    v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
344 
345 		    /* Hurrah! matched */
346 		    if ( ((v2 - 1 + 7) / 7) == v1 )
347 			day = v2;
348 
349 		    /* set to yesterday */
350 		    else {
351 			day = tp->tm_mday - 1;
352 			if (day == 0)
353 			    return (0);
354 		    }
355 		}
356 	    }
357 
358 	    /* wired */
359 	    else {
360 		day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
361 		*varp = 1;
362 	    }
363 	}
364 
365 	if (!(flags & F_EASTER)) {
366 	    *monthp = month;
367 	    *dayp = day;
368 	    day = cumdays[month] + day;
369 	}
370 	else {
371 	    for (v1 = 0; day > cumdays[v1]; v1++)
372 		;
373 	    *monthp = v1 - 1;
374 	    *dayp = day - cumdays[v1 - 1];
375 	    *varp = 1;
376 	}
377 
378 #ifdef DEBUG
379 	fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday);
380 #endif
381 	/* if today or today + offset days */
382 	if (day >= tp->tm_yday - f_dayBefore &&
383 	    day <= tp->tm_yday + offset + f_dayAfter)
384 		return (1);
385 
386 	/* if number of days left in this year + days to event in next year */
387 	if (yrdays - tp->tm_yday + day <= offset + f_dayAfter ||
388 	    /* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */
389 	    tp->tm_yday + day - f_dayBefore < 0
390 	    )
391 		return (1);
392 	return (0);
393 }
394 
395 
396 int
397 getmonth(s)
398 	char *s;
399 {
400 	const char **p;
401 	struct fixs *n;
402 
403 	for (n = fnmonths; n->name; ++n)
404 		if (!strncasecmp(s, n->name, n->len))
405 			return ((n - fnmonths) + 1);
406 	for (n = nmonths; n->name; ++n)
407 		if (!strncasecmp(s, n->name, n->len))
408 			return ((n - nmonths) + 1);
409 	for (p = months; *p; ++p)
410 		if (!strncasecmp(s, *p, 3))
411 			return ((p - months) + 1);
412 	return (0);
413 }
414 
415 
416 int
417 getday(s)
418 	char *s;
419 {
420 	const char **p;
421 	struct fixs *n;
422 
423 	for (n = fndays; n->name; ++n)
424 		if (!strncasecmp(s, n->name, n->len))
425 			return ((n - fndays) + 1);
426 	for (n = ndays; n->name; ++n)
427 		if (!strncasecmp(s, n->name, n->len))
428 			return ((n - ndays) + 1);
429 	for (p = days; *p; ++p)
430 		if (!strncasecmp(s, *p, 3))
431 			return ((p - days) + 1);
432 	return (0);
433 }
434 
435 /* return offset for variable weekdays
436  * -1 -> last weekday in month
437  * +1 -> first weekday in month
438  * ... etc ...
439  */
440 int
441 getdayvar(s)
442 	char *s;
443 {
444 	int offs;
445 
446 
447 	offs = strlen(s);
448 
449 
450 	/* Sun+1 or Wednesday-2
451 	 *    ^              ^   */
452 
453 	/* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
454 	switch(*(s + offs - 2)) {
455 	case '-':
456 	    return(-(atoi(s + offs - 1)));
457 	    break;
458 	case '+':
459 	    return(atoi(s + offs - 1));
460 	    break;
461 	}
462 
463 
464 	/*
465 	 * some aliases: last, first, second, third, fourth
466 	 */
467 
468 	/* last */
469 	if      (offs > 4 && !strcasecmp(s + offs - 4, "last"))
470 	    return(-1);
471 	else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
472 	    return(+1);
473 	else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
474 	    return(+2);
475 	else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
476 	    return(+3);
477 	else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
478 	    return(+4);
479 
480 
481 	/* no offset detected */
482 	return(0);
483 }
484