xref: /freebsd/usr.bin/calendar/day.c (revision a220d00e74dd245b4fca59c5eca0c53963686325)
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  * $FreeBSD$
34  */
35 
36 
37 #include <ctype.h>
38 #include <locale.h>
39 #include <stdio.h>
40 #include <string.h>
41 #include <sys/types.h>
42 #include <time.h>
43 #include <sys/uio.h>
44 #include <string.h>
45 #include <stdlib.h>
46 #include <err.h>
47 
48 #include "pathnames.h"
49 #include "calendar.h"
50 
51 struct tm *tp;
52 int *cumdays, offset, yrdays;
53 char dayname[10];
54 
55 
56 /* 1-based month, 0-based days, cumulative */
57 int daytab[][14] = {
58 	{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
59 	{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
60 };
61 
62 static char *days[] = {
63 	"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
64 };
65 
66 static char *months[] = {
67 	"jan", "feb", "mar", "apr", "may", "jun",
68 	"jul", "aug", "sep", "oct", "nov", "dec", NULL,
69 };
70 
71 static struct fixs fndays[8];         /* full national days names */
72 static struct fixs ndays[8];          /* short national days names */
73 
74 static struct fixs fnmonths[13];      /* full national months names */
75 static struct fixs nmonths[13];       /* short national month names */
76 
77 
78 void setnnames(void)
79 {
80 	char buf[80];
81 	int i, l;
82 	struct tm tm;
83 
84 	for (i = 0; i < 7; i++) {
85 		tm.tm_wday = i;
86 		strftime(buf, sizeof(buf), "%a", &tm);
87 		for (l = strlen(buf);
88 		     l > 0 && isspace((unsigned char)buf[l - 1]);
89 		     l--)
90 			;
91 		buf[l] = '\0';
92 		if (ndays[i].name != NULL)
93 			free(ndays[i].name);
94 		if ((ndays[i].name = strdup(buf)) == NULL)
95 			errx(1, "cannot allocate memory");
96 		ndays[i].len = strlen(buf);
97 
98 		strftime(buf, sizeof(buf), "%A", &tm);
99 		for (l = strlen(buf);
100 		     l > 0 && isspace((unsigned char)buf[l - 1]);
101 		     l--)
102 			;
103 		buf[l] = '\0';
104 		if (fndays[i].name != NULL)
105 			free(fndays[i].name);
106 		if ((fndays[i].name = strdup(buf)) == NULL)
107 			errx(1, "cannot allocate memory");
108 		fndays[i].len = strlen(buf);
109 	}
110 
111 	for (i = 0; i < 12; i++) {
112 		tm.tm_mon = i;
113 		strftime(buf, sizeof(buf), "%b", &tm);
114 		for (l = strlen(buf);
115 		     l > 0 && isspace((unsigned char)buf[l - 1]);
116 		     l--)
117 			;
118 		buf[l] = '\0';
119 		if (nmonths[i].name != NULL)
120 			free(nmonths[i].name);
121 		if ((nmonths[i].name = strdup(buf)) == NULL)
122 			errx(1, "cannot allocate memory");
123 		nmonths[i].len = strlen(buf);
124 
125 		strftime(buf, sizeof(buf), "%B", &tm);
126 		for (l = strlen(buf);
127 		     l > 0 && isspace((unsigned char)buf[l - 1]);
128 		     l--)
129 			;
130 		buf[l] = '\0';
131 		if (fnmonths[i].name != NULL)
132 			free(fnmonths[i].name);
133 		if ((fnmonths[i].name = strdup(buf)) == NULL)
134 			errx(1, "cannot allocate memory");
135 		fnmonths[i].len = strlen(buf);
136 	}
137 }
138 
139 void
140 settime(now)
141     	time_t now;
142 {
143 	char *oldl;
144 
145 	tp = localtime(&now);
146 	if ( isleap(tp->tm_year + 1900) ) {
147 		yrdays = 366;
148 		cumdays = daytab[1];
149 	} else {
150 		yrdays = 365;
151 		cumdays = daytab[0];
152 	}
153 	/* Friday displays Monday's events */
154 	offset = tp->tm_wday == 5 ? 3 : 1;
155 	header[5].iov_base = dayname;
156 
157 	oldl = setlocale(LC_TIME, NULL);
158 	(void) setlocale(LC_TIME, "C");
159 	header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
160 	(void) setlocale(LC_TIME, oldl);
161 
162 	setnnames();
163 }
164 
165 /* convert Day[/Month][/Year] into unix time (since 1970)
166  * Day: two digits, Month: two digits, Year: digits
167  */
168 time_t Mktime (dp)
169     char *dp;
170 {
171     time_t t;
172     int d, m, y;
173     struct tm tm;
174 
175     (void)time(&t);
176     tp = localtime(&t);
177 
178     tm.tm_sec = 0;
179     tm.tm_min = 0;
180     tm.tm_hour = 0;
181     tm.tm_wday = 0;
182     tm.tm_mday = tp->tm_mday;
183     tm.tm_mon = tp->tm_mon;
184     tm.tm_year = tp->tm_year;
185 
186     switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
187     case 3:
188 	if (y > 1900)
189 	    y -= 1900;
190 	tm.tm_year = y;
191 	/* FALLTHROUGH */
192     case 2:
193 	tm.tm_mon = m - 1;
194 	/* FALLTHROUGH */
195     case 1:
196 	tm.tm_mday = d;
197     }
198 
199 #ifdef DEBUG
200     fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
201 	   asctime(&tm));
202 #endif
203     return(mktime(&tm));
204 }
205 
206 /*
207  * Possible date formats include any combination of:
208  *	3-charmonth			(January, Jan, Jan)
209  *	3-charweekday			(Friday, Monday, mon.)
210  *	numeric month or day		(1, 2, 04)
211  *
212  * Any character may separate them, or they may not be separated.  Any line,
213  * following a line that is matched, that starts with "whitespace", is shown
214  * along with the matched line.
215  */
216 int
217 isnow(endp, monthp, dayp, varp)
218 	char *endp;
219 	int	*monthp;
220 	int	*dayp;
221 	int	*varp;
222 {
223 	int day, flags, month = 0, v1, v2;
224 
225 	/*
226 	 * CONVENTION
227 	 *
228 	 * Month:     1-12
229 	 * Monthname: Jan .. Dec
230 	 * Day:       1-31
231 	 * Weekday:   Mon-Sun
232 	 *
233 	 */
234 
235 	flags = 0;
236 
237 	/* read first field */
238 	/* didn't recognize anything, skip it */
239 	if (!(v1 = getfield(endp, &endp, &flags)))
240 		return (0);
241 
242 	/* Easter or Easter depending days */
243 	if (flags & F_EASTER)
244 	    day = v1 - 1; /* days since January 1 [0-365] */
245 
246 	 /*
247 	  * 1. {Weekday,Day} XYZ ...
248 	  *
249 	  *    where Day is > 12
250 	  */
251 	else if (flags & F_ISDAY || v1 > 12) {
252 
253 		/* found a day; day: 1-31 or weekday: 1-7 */
254 		day = v1;
255 
256 		/* {Day,Weekday} {Month,Monthname} ... */
257 		/* if no recognizable month, assume just a day alone
258 		 * in other words, find month or use current month */
259 		if (!(month = getfield(endp, &endp, &flags)))
260 			month = tp->tm_mon + 1;
261 	}
262 
263 	/* 2. {Monthname} XYZ ... */
264 	else if (flags & F_ISMONTH) {
265 		month = v1;
266 
267 		/* Monthname {day,weekday} */
268 		/* if no recognizable day, assume the first day in month */
269 		if (!(day = getfield(endp, &endp, &flags)))
270 			day = 1;
271 	}
272 
273 	/* Hm ... */
274 	else {
275 		v2 = getfield(endp, &endp, &flags);
276 
277 		/*
278 		 * {Day} {Monthname} ...
279 		 * where Day <= 12
280 		 */
281 		if (flags & F_ISMONTH) {
282 			day = v1;
283 			month = v2;
284 			*varp = 0;
285 		}
286 
287 		/* {Month} {Weekday,Day} ...  */
288 		else {
289 			/* F_ISDAY set, v2 > 12, or no way to tell */
290 			month = v1;
291 			/* if no recognizable day, assume the first */
292 			day = v2 ? v2 : 1;
293 			*varp = 0;
294 		}
295 	}
296 
297 	/* convert Weekday into *next*  Day,
298 	 * e.g.: 'Sunday' -> 22
299 	 *       'SundayLast' -> ??
300 	 */
301 	if (flags & F_ISDAY) {
302 #ifdef DEBUG
303 	    fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
304 #endif
305 
306 	    *varp = 1;
307 	    /* variable weekday, SundayLast, MondayFirst ... */
308 	    if (day < 0 || day >= 10) {
309 
310 		/* negative offset; last, -4 .. -1 */
311 		if (day < 0) {
312 		    v1 = day/10 - 1;          /* offset -4 ... -1 */
313 	            day = 10 + (day % 10);    /* day 1 ... 7 */
314 
315 		    /* day, eg '22nd' */
316 		    v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
317 
318 		    /* (month length - day) / 7 + 1 */
319 		    if (cumdays[month+1] - cumdays[month] >= v2
320 			&& ((int)((cumdays[month+1] -
321 		               cumdays[month] - v2) / 7) + 1) == -v1)
322 			/* bingo ! */
323 			day = v2;
324 
325 		    /* set to yesterday */
326 		    else {
327 			day = tp->tm_mday - 1;
328 			if (day == 0)
329 			    return (0);
330 		    }
331 		}
332 
333 		/* first, second ... +1 ... +5 */
334 		else {
335 		    v1 = day/10;        /* offset: +1 (first Sunday) ... */
336 		    day = day % 10;
337 
338 		    /* day, eg '22th' */
339 		    v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
340 
341 		    /* Hurrah! matched */
342 		    if ( ((v2 - 1 + 7) / 7) == v1 )
343 			day = v2;
344 
345 		    /* set to yesterday */
346 		    else {
347 			day = tp->tm_mday - 1;
348 			if (day == 0)
349 			    return (0);
350 		    }
351 		}
352 	    }
353 
354 	    /* wired */
355 	    else {
356 		day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
357 		*varp = 1;
358 	    }
359 	}
360 
361 	if (!(flags & F_EASTER)) {
362 	    *monthp = month;
363 	    *dayp = day;
364 	    day = cumdays[month] + day;
365 	}
366 	else {
367 	    for (v1 = 0; day > cumdays[v1]; v1++)
368 		;
369 	    *monthp = v1 - 1;
370 	    *dayp = day - cumdays[v1 - 1];
371 	    *varp = 1;
372 	}
373 
374 #ifdef DEBUG
375 	fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday);
376 #endif
377 	/* if today or today + offset days */
378 	if (day >= tp->tm_yday - f_dayBefore &&
379 	    day <= tp->tm_yday + offset + f_dayAfter)
380 		return (1);
381 
382 	/* if number of days left in this year + days to event in next year */
383 	if (yrdays - tp->tm_yday + day <= offset + f_dayAfter ||
384 	    /* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */
385 	    tp->tm_yday + day - f_dayBefore < 0
386 	    )
387 		return (1);
388 	return (0);
389 }
390 
391 
392 int
393 getmonth(s)
394 	register char *s;
395 {
396 	register char **p;
397 	struct fixs *n;
398 
399 	for (n = fnmonths; n->name; ++n)
400 		if (!strncasecmp(s, n->name, n->len))
401 			return ((n - fnmonths) + 1);
402 	for (n = nmonths; n->name; ++n)
403 		if (!strncasecmp(s, n->name, n->len))
404 			return ((n - nmonths) + 1);
405 	for (p = months; *p; ++p)
406 		if (!strncasecmp(s, *p, 3))
407 			return ((p - months) + 1);
408 	return (0);
409 }
410 
411 
412 int
413 getday(s)
414 	register char *s;
415 {
416 	register char **p;
417 	struct fixs *n;
418 
419 	for (n = fndays; n->name; ++n)
420 		if (!strncasecmp(s, n->name, n->len))
421 			return ((n - fndays) + 1);
422 	for (n = ndays; n->name; ++n)
423 		if (!strncasecmp(s, n->name, n->len))
424 			return ((n - ndays) + 1);
425 	for (p = days; *p; ++p)
426 		if (!strncasecmp(s, *p, 3))
427 			return ((p - days) + 1);
428 	return (0);
429 }
430 
431 /* return offset for variable weekdays
432  * -1 -> last weekday in month
433  * +1 -> first weekday in month
434  * ... etc ...
435  */
436 int
437 getdayvar(s)
438 	register char *s;
439 {
440 	register int offset;
441 
442 
443 	offset = strlen(s);
444 
445 
446 	/* Sun+1 or Wednesday-2
447 	 *    ^              ^   */
448 
449 	/* fprintf(stderr, "x: %s %s %d\n", s, s + offset - 2, offset); */
450 	switch(*(s + offset - 2)) {
451 	case '-':
452 	    return(-(atoi(s + offset - 1)));
453 	    break;
454 	case '+':
455 	    return(atoi(s + offset - 1));
456 	    break;
457 	}
458 
459 
460 	/*
461 	 * some aliases: last, first, second, third, fourth
462 	 */
463 
464 	/* last */
465 	if      (offset > 4 && !strcasecmp(s + offset - 4, "last"))
466 	    return(-1);
467 	else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
468 	    return(+1);
469 	else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
470 	    return(+2);
471 	else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
472 	    return(+3);
473 	else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
474 	    return(+4);
475 
476 
477 	/* no offset detected */
478 	return(0);
479 }
480