GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/cal/cal.c Lines: 0 213 0.0 %
Date: 2016-12-06 Branches: 0 159 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: cal.c,v 1.30 2015/10/09 01:37:06 deraadt Exp $	*/
2
/*	$NetBSD: cal.c,v 1.6 1995/03/26 03:10:24 glass Exp $	*/
3
4
/*
5
 * Copyright (c) 1989, 1993, 1994
6
 *	The Regents of the University of California.  All rights reserved.
7
 *
8
 * This code is derived from software contributed to Berkeley by
9
 * Kim Letkeman.
10
 *
11
 * Redistribution and use in source and binary forms, with or without
12
 * modification, are permitted provided that the following conditions
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 * are met:
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 * 1. Redistributions of source code must retain the above copyright
15
 *    notice, this list of conditions and the following disclaimer.
16
 * 2. Redistributions in binary form must reproduce the above copyright
17
 *    notice, this list of conditions and the following disclaimer in the
18
 *    documentation and/or other materials provided with the distribution.
19
 * 3. Neither the name of the University nor the names of its contributors
20
 *    may be used to endorse or promote products derived from this software
21
 *    without specific prior written permission.
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 *
23
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33
 * SUCH DAMAGE.
34
 */
35
36
#include <sys/types.h>
37
38
#include <ctype.h>
39
#include <err.h>
40
#include <stdio.h>
41
#include <stdlib.h>
42
#include <string.h>
43
#include <time.h>
44
#include <unistd.h>
45
46
#define	THURSDAY		4		/* for reformation */
47
#define	SATURDAY		6		/* 1 Jan 1 was a Saturday */
48
49
#define	FIRST_MISSING_DAY	639799		/* 3 Sep 1752 */
50
#define	NUMBER_MISSING_DAYS	11		/* 11 day correction */
51
52
#define	MAXDAYS			42		/* max slots in a month array */
53
#define	SPACE			-1		/* used in day array */
54
55
static const int days_in_month[2][13] = {
56
	{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
57
	{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
58
};
59
60
const int sep1752s[MAXDAYS] = {
61
	SPACE,	SPACE,	1,	2,	14,	15,	16,
62
	17,	18,	19,	20,	21,	22,	23,
63
	24,	25,	26,	27,	28,	29,	30,
64
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
65
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
66
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
67
}, sep1752m[MAXDAYS] = {
68
	SPACE,	1,	2,	14,	15,	16,	17,
69
	18,	19,	20,	21,	22,	23,	24,
70
	25,	26,	27,	28,	29,	30,	SPACE,
71
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
72
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
73
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
74
}, sep1752js[MAXDAYS] = {
75
	SPACE,	SPACE,	245,	246,	258,	259,	260,
76
	261,	262,	263,	264,	265,	266,	267,
77
	268,	269,	270,	271,	272,	273,	274,
78
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
79
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
80
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
81
}, sep1752jm[MAXDAYS] = {
82
	SPACE,	245,	246,	258,	259,	260,	261,
83
	262,	263,	264,	265,	266,	267,	268,
84
	269,	270,	271,	272,	273,	274,	SPACE,
85
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
86
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
87
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
88
}, empty[MAXDAYS] = {
89
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
90
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
91
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
92
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
93
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
94
	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,	SPACE,
95
};
96
97
const char *month_names[12] = {
98
	"January", "February", "March", "April", "May", "June",
99
	"July", "August", "September", "October", "November", "December",
100
};
101
102
#define	DAY_HEADINGS_S	"Su Mo Tu We Th Fr Sa"
103
#define	DAY_HEADINGS_M	"Mo Tu We Th Fr Sa Su"
104
#define	DAY_HEADINGS_JS	" Su  Mo  Tu  We  Th  Fr  Sa"
105
#define	DAY_HEADINGS_JM	" Mo  Tu  We  Th  Fr  Sa  Su"
106
107
const int	*sep1752 = NULL;
108
const char	*day_headings = NULL;
109
110
/* leap year -- account for gregorian reformation in 1752 */
111
#define	leap_year(yr) \
112
	((yr) <= 1752 ? !((yr) % 4) : \
113
	(!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
114
115
/* number of centuries since 1700, not inclusive */
116
#define	centuries_since_1700(yr) \
117
	((yr) > 1700 ? (yr) / 100 - 17 : 0)
118
119
/* number of centuries since 1700 whose modulo of 400 is 0 */
120
#define	quad_centuries_since_1700(yr) \
121
	((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
122
123
/* number of leap years between year 1 and this year, not inclusive */
124
#define	leap_years_since_year_1(yr) \
125
	((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
126
127
int julian;
128
int mflag = 0;
129
int wflag = 0;
130
131
void	ascii_day(char *, int);
132
void	center(const char *, int, int);
133
void	day_array(int, int, int *);
134
int	day_in_week(int, int, int);
135
int	day_in_year(int, int, int);
136
int	week(int, int, int);
137
int	isoweek(int, int, int);
138
void	j_yearly(int);
139
void	monthly(int, int);
140
void	trim_trailing_spaces(char *);
141
void	usage(void);
142
void	yearly(int);
143
int	parsemonth(const char *);
144
145
int
146
main(int argc, char *argv[])
147
{
148
	struct tm *local_time;
149
	time_t now;
150
	int ch, month, year, yflag;
151
	const char *errstr;
152
153
	if (pledge("stdio wpath cpath rpath", NULL) == -1)
154
		err(1, "pledge");
155
156
	yflag = year = 0;
157
	while ((ch = getopt(argc, argv, "jmwy")) != -1)
158
		switch(ch) {
159
		case 'j':
160
			julian = 1;
161
			break;
162
		case 'm':
163
			mflag = 1;
164
			break;
165
		case 'w':
166
			wflag = 1;
167
			break;
168
		case 'y':
169
			yflag = 1;
170
			break;
171
		case '?':
172
		default:
173
			usage();
174
		}
175
	argc -= optind;
176
	argv += optind;
177
178
	if (julian && wflag)
179
		usage();
180
181
	day_headings = DAY_HEADINGS_S;
182
	sep1752 = sep1752s;
183
	if (mflag && julian) {
184
		sep1752 = sep1752jm;
185
		day_headings = DAY_HEADINGS_JM;
186
	} else if (mflag) {
187
		sep1752 = sep1752m;
188
		day_headings = DAY_HEADINGS_M;
189
	} else if (julian) {
190
		sep1752 = sep1752js;
191
		day_headings = DAY_HEADINGS_JS;
192
	}
193
194
	month = 0;
195
	switch(argc) {
196
	case 2:
197
		month = parsemonth(*argv++);
198
		if (!month)
199
			errx(1, "Unable to parse month");
200
		/* FALLTHROUGH */
201
	case 1:
202
		if (argc == 1 && !isdigit((unsigned char)*argv[0])) {
203
			month = parsemonth(*argv);
204
			if (!month)
205
				errx(1, "illegal year value: use 1-9999");
206
			(void)time(&now);
207
			local_time = localtime(&now);
208
			year = local_time->tm_year + 1900;
209
		} else {
210
			year = strtonum(*argv, 1, 9999, &errstr);
211
			if (errstr)
212
				errx(1, "illegal year value: use 1-9999");
213
		}
214
		break;
215
	case 0:
216
		(void)time(&now);
217
		local_time = localtime(&now);
218
		year = local_time->tm_year + 1900;
219
		if (!yflag)
220
			month = local_time->tm_mon + 1;
221
		break;
222
	default:
223
		usage();
224
	}
225
226
	if (month)
227
		monthly(month, year);
228
	else if (julian)
229
		j_yearly(year);
230
	else
231
		yearly(year);
232
	exit(0);
233
}
234
235
#define	DAY_LEN		3		/* 3 spaces per day */
236
#define	J_DAY_LEN	4		/* 4 spaces per day */
237
#define	WEEK_LEN	20		/* 7 * 3 - one space at the end */
238
#define WEEKNUMBER_LEN	5		/* 5 spaces per week number */
239
#define	J_WEEK_LEN	27		/* 7 * 4 - one space at the end */
240
#define	HEAD_SEP	2		/* spaces between day headings */
241
#define	J_HEAD_SEP	2
242
243
int
244
week(int day, int month, int year)
245
{
246
	int	yearday;
247
	int	firstweekday;
248
	int	weekday;
249
	int	firstday;
250
	int	firstsunday;
251
	int	shift;
252
253
	if (mflag)
254
		return isoweek(day, month, year);
255
256
	yearday = day_in_year(day, month, year);
257
	firstweekday = day_in_week(1, 1, year) + 1;
258
	weekday = day_in_week(day, month, year) + 1;
259
	firstday = day_in_year(1, 1, year);
260
	firstsunday = firstday + (8 - firstweekday);
261
262
	shift = 1;
263
	if (yearday < firstsunday)
264
		return (1);
265
	if (firstweekday > THURSDAY - 1)
266
		shift = 2;
267
	return ((((yearday + 1) - (weekday - 1)) / 7) + shift);
268
}
269
270
int
271
isoweek(int day, int month, int year)
272
{
273
	/* http://www.tondering.dk/claus/cal/node8.html */
274
	int a, b, c, s, e, f, g, d, n;
275
276
	a = month <= 2 ? year - 1 : year;
277
	b = a/4 - a/100 + a/400;
278
	c = (a-1)/4 - (a-1)/100 + (a-1)/400;
279
	s = b - c;
280
	if (month <= 2) {
281
		e = 0;
282
		f = day - 1 + 31 * (month-1);
283
	} else {
284
		e = s + 1;
285
		f = day + ((153 * (month-3) + 2) / 5) + 58 + s;
286
	}
287
	g = (a + b) % 7;
288
	d = (f + g - e) % 7;
289
	n = f + 3 - d;
290
291
	if (n < 0)
292
		return 53 - (g - s) / 5;
293
	else if (n > 364 + s)
294
		return 1;
295
	else
296
		return n/7 + 1;
297
}
298
299
void
300
monthly(int month, int year)
301
{
302
	int col, row, len, days[MAXDAYS], firstday;
303
	char *p, lineout[30];
304
305
	day_array(month, year, days);
306
	(void)snprintf(lineout, sizeof(lineout), "%s %d",
307
	    month_names[month - 1], year);
308
	len = strlen(lineout);
309
	(void)printf("%*s%s\n%s\n",
310
	    ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
311
	    lineout, day_headings);
312
	for (row = 0; row < 6; row++) {
313
		firstday = SPACE;
314
		for (col = 0, p = lineout; col < 7; col++,
315
		    p += julian ? J_DAY_LEN : DAY_LEN) {
316
			if (firstday == SPACE && days[row * 7 + col] != SPACE)
317
				firstday = days[row * 7 + col];
318
			ascii_day(p, days[row * 7 + col]);
319
		}
320
		*p = '\0';
321
		trim_trailing_spaces(lineout);
322
		(void)printf("%-20s", lineout);
323
		if (wflag && firstday != SPACE)
324
			printf(" [%2d]", week(firstday, month, year));
325
		printf("\n");
326
	}
327
}
328
329
void
330
j_yearly(int year)
331
{
332
	int col, *dp, i, month, row, which_cal;
333
	int days[12][MAXDAYS];
334
	char *p, lineout[80];
335
336
	(void)snprintf(lineout, sizeof(lineout), "%d", year);
337
	center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
338
	(void)printf("\n\n");
339
	for (i = 0; i < 12; i++)
340
		day_array(i + 1, year, days[i]);
341
	(void)memset(lineout, ' ', sizeof(lineout) - 1);
342
	lineout[sizeof(lineout) - 1] = '\0';
343
	for (month = 0; month < 12; month += 2) {
344
		center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
345
		center(month_names[month + 1], J_WEEK_LEN, 0);
346
		(void)printf("\n%s%*s%s\n", day_headings,
347
		    J_HEAD_SEP, "", day_headings);
348
349
		for (row = 0; row < 6; row++) {
350
			for (which_cal = 0; which_cal < 2; which_cal++) {
351
				p = lineout + which_cal * (J_WEEK_LEN + 2);
352
				dp = &days[month + which_cal][row * 7];
353
				for (col = 0; col < 7; col++, p += J_DAY_LEN)
354
					ascii_day(p, *dp++);
355
			}
356
			*p = '\0';
357
			trim_trailing_spaces(lineout);
358
			(void)printf("%s\n", lineout);
359
		}
360
	}
361
	(void)printf("\n");
362
}
363
364
void
365
yearly(int year)
366
{
367
	int col, *dp, i, month, row, which_cal, week_len, wn, firstday;
368
	int days[12][MAXDAYS];
369
	char *p, lineout[81];
370
371
	week_len = WEEK_LEN;
372
	if (wflag)
373
		week_len += WEEKNUMBER_LEN;
374
	(void)snprintf(lineout, sizeof(lineout), "%d", year);
375
	center(lineout, week_len * 3 + HEAD_SEP * 2, 0);
376
	(void)printf("\n\n");
377
	for (i = 0; i < 12; i++)
378
		day_array(i + 1, year, days[i]);
379
	(void)memset(lineout, ' ', sizeof(lineout) - 1);
380
	lineout[sizeof(lineout) - 1] = '\0';
381
	for (month = 0; month < 12; month += 3) {
382
		center(month_names[month], week_len, HEAD_SEP);
383
		center(month_names[month + 1], week_len, HEAD_SEP);
384
		center(month_names[month + 2], week_len, 0);
385
		(void)printf("\n%s%*s%s%*s%s\n", day_headings,
386
		    HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings,
387
		    HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings);
388
389
		for (row = 0; row < 6; row++) {
390
			for (which_cal = 0; which_cal < 3; which_cal++) {
391
				p = lineout + which_cal * (week_len + 2);
392
393
				dp = &days[month + which_cal][row * 7];
394
				firstday = SPACE;
395
				for (col = 0; col < 7; col++, p += DAY_LEN) {
396
					if (firstday == SPACE && *dp != SPACE)
397
						firstday = *dp;
398
					ascii_day(p, *dp++);
399
				}
400
				if (wflag && firstday != SPACE) {
401
					wn = week(firstday,
402
					    month + which_cal + 1, year);
403
					(void)snprintf(p, 5, "[%2d]", wn);
404
					p += strlen(p);
405
					*p = ' ';
406
				} else
407
					memset(p, ' ', 4);
408
			}
409
			*p = '\0';
410
			trim_trailing_spaces(lineout);
411
			(void)printf("%s\n", lineout);
412
		}
413
	}
414
	(void)printf("\n");
415
}
416
417
/*
418
 * day_array --
419
 *	Fill in an array of 42 integers with a calendar.  Assume for a moment
420
 *	that you took the (maximum) 6 rows in a calendar and stretched them
421
 *	out end to end.  You would have 42 numbers or spaces.  This routine
422
 *	builds that array for any month from Jan. 1 through Dec. 9999.
423
 */
424
void
425
day_array(int month, int year, int *days)
426
{
427
	int day, dw, dm;
428
429
	if (month == 9 && year == 1752) {
430
		memmove(days, sep1752, MAXDAYS * sizeof(int));
431
		return;
432
	}
433
	memmove(days, empty, MAXDAYS * sizeof(int));
434
	dm = days_in_month[leap_year(year)][month];
435
	dw = day_in_week(mflag?0:1, month, year);
436
	day = julian ? day_in_year(1, month, year) : 1;
437
	while (dm--)
438
		days[dw++] = day++;
439
}
440
441
/*
442
 * day_in_year --
443
 *	return the 1 based day number within the year
444
 */
445
int
446
day_in_year(int day, int month, int year)
447
{
448
	int i, leap;
449
450
	leap = leap_year(year);
451
	for (i = 1; i < month; i++)
452
		day += days_in_month[leap][i];
453
	return (day);
454
}
455
456
/*
457
 * day_in_week
458
 *	return the 0 based day number for any date from 1 Jan. 1 to
459
 *	31 Dec. 9999.  Assumes the Gregorian reformation eliminates
460
 *	3 Sep. 1752 through 13 Sep. 1752.  Returns Thursday for all
461
 *	missing days.
462
 */
463
int
464
day_in_week(int day, int month, int year)
465
{
466
	long temp;
467
468
	temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
469
	    + day_in_year(day, month, year);
470
	if (temp < FIRST_MISSING_DAY)
471
		return ((temp - 1 + SATURDAY) % 7);
472
	if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
473
		return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
474
	return (THURSDAY);
475
}
476
477
void
478
ascii_day(char *p, int day)
479
{
480
	int display, val;
481
	static const char *aday[] = {
482
		"",
483
		" 1", " 2", " 3", " 4", " 5", " 6", " 7",
484
		" 8", " 9", "10", "11", "12", "13", "14",
485
		"15", "16", "17", "18", "19", "20", "21",
486
		"22", "23", "24", "25", "26", "27", "28",
487
		"29", "30", "31",
488
	};
489
490
	if (day == SPACE) {
491
		memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
492
		return;
493
	}
494
	if (julian) {
495
		val = day / 100;
496
		if (val) {
497
			day %= 100;
498
			*p++ = val + '0';
499
			display = 1;
500
		} else {
501
			*p++ = ' ';
502
			display = 0;
503
		}
504
		val = day / 10;
505
		if (val || display)
506
			*p++ = val + '0';
507
		else
508
			*p++ = ' ';
509
		*p++ = day % 10 + '0';
510
	} else {
511
		*p++ = aday[day][0];
512
		*p++ = aday[day][1];
513
	}
514
	*p = ' ';
515
}
516
517
void
518
trim_trailing_spaces(char *s)
519
{
520
	char *p;
521
522
	for (p = s; *p; ++p)
523
		continue;
524
	while (p > s && isspace((unsigned char)*--p))
525
		continue;
526
	if (p > s)
527
		++p;
528
	*p = '\0';
529
}
530
531
void
532
center(const char *str, int len, int separate)
533
{
534
535
	len -= strlen(str);
536
	(void)printf("%*s%s%*s", len / 2, "", str,
537
	    len / 2 + len % 2 + separate, "");
538
}
539
540
void
541
usage(void)
542
{
543
544
	(void)fprintf(stderr, "usage: cal [-jmwy] [month] [year]\n");
545
	exit(1);
546
}
547
548
int
549
parsemonth(const char *s)
550
{
551
	struct tm tm;
552
	char *cp;
553
	int v;
554
555
	v = (int)strtol(s, &cp, 10);
556
	if (*cp != '\0') {		/* s wasn't purely numeric */
557
		v = 0;
558
		if ((cp = strptime(s, "%b", &tm)) != NULL && *cp == '\0')
559
			v = tm.tm_mon + 1;
560
	}
561
	if (v <= 0 || v > 12)
562
		errx(1, "invalid month: use 1-12 or a name");
563
	return (v);
564
}