Annotation of src/usr.bin/cal/cal.c, Revision 1.25
1.25 ! deraadt 1: /* $OpenBSD: cal.c,v 1.24 2009/01/01 21:07:17 otto Exp $ */
1.1 deraadt 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
13: * are met:
14: * 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.
1.9 millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * 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>
1.5 deraadt 44: #include <tzfile.h>
1.1 deraadt 45: #include <unistd.h>
46:
47: #define THURSDAY 4 /* for reformation */
1.14 deraadt 48: #define SATURDAY 6 /* 1 Jan 1 was a Saturday */
1.1 deraadt 49:
1.14 deraadt 50: #define FIRST_MISSING_DAY 639799 /* 3 Sep 1752 */
51: #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
1.1 deraadt 52:
53: #define MAXDAYS 42 /* max slots in a month array */
54: #define SPACE -1 /* used in day array */
55:
1.13 tedu 56: static const int days_in_month[2][13] = {
1.1 deraadt 57: {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
58: {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
59: };
60:
1.22 pyr 61: const int sep1752s[MAXDAYS] = {
1.1 deraadt 62: SPACE, SPACE, 1, 2, 14, 15, 16,
63: 17, 18, 19, 20, 21, 22, 23,
64: 24, 25, 26, 27, 28, 29, 30,
65: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
66: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
67: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.22 pyr 68: }, sep1752m[MAXDAYS] = {
69: SPACE, 1, 2, 14, 15, 16, 17,
70: 18, 19, 20, 21, 22, 23, 24,
71: 25, 26, 27, 28, 29, 30, SPACE,
72: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
73: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
74: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
75: }, sep1752js[MAXDAYS] = {
1.1 deraadt 76: SPACE, SPACE, 245, 246, 258, 259, 260,
77: 261, 262, 263, 264, 265, 266, 267,
78: 268, 269, 270, 271, 272, 273, 274,
79: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
80: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
81: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.22 pyr 82: }, sep1752jm[MAXDAYS] = {
83: SPACE, 245, 246, 258, 259, 260, 261,
84: 262, 263, 264, 265, 266, 267, 268,
85: 269, 270, 271, 272, 273, 274, SPACE,
86: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
87: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
88: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
1.1 deraadt 89: }, empty[MAXDAYS] = {
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: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
96: };
97:
1.13 tedu 98: const char *month_names[12] = {
1.1 deraadt 99: "January", "February", "March", "April", "May", "June",
100: "July", "August", "September", "October", "November", "December",
101: };
102:
1.22 pyr 103: #define DAY_HEADINGS_S "Su Mo Tu We Th Fr Sa"
104: #define DAY_HEADINGS_M "Mo Tu We Th Fr Sa Su"
105: #define DAY_HEADINGS_JS " Su Mo Tu We Th Fr Sa"
106: #define DAY_HEADINGS_JM " Mo Tu We Th Fr Sa Su"
107:
108: const int *sep1752 = NULL;
109: const char *day_headings = NULL;
1.1 deraadt 110:
111: /* leap year -- account for gregorian reformation in 1752 */
112: #define leap_year(yr) \
113: ((yr) <= 1752 ? !((yr) % 4) : \
1.5 deraadt 114: (!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
1.1 deraadt 115:
116: /* number of centuries since 1700, not inclusive */
117: #define centuries_since_1700(yr) \
118: ((yr) > 1700 ? (yr) / 100 - 17 : 0)
119:
120: /* number of centuries since 1700 whose modulo of 400 is 0 */
121: #define quad_centuries_since_1700(yr) \
122: ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
123:
124: /* number of leap years between year 1 and this year, not inclusive */
125: #define leap_years_since_year_1(yr) \
126: ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
127:
128: int julian;
1.22 pyr 129: int mflag = 0;
1.23 pyr 130: int wflag = 0;
1.1 deraadt 131:
1.7 millert 132: void ascii_day(char *, int);
1.13 tedu 133: void center(const char *, int, int);
1.7 millert 134: void day_array(int, int, int *);
135: int day_in_week(int, int, int);
136: int day_in_year(int, int, int);
1.23 pyr 137: int week(int, int, int);
1.24 otto 138: int isoweek(int, int, int);
1.7 millert 139: void j_yearly(int);
140: void monthly(int, int);
141: void trim_trailing_spaces(char *);
142: void usage(void);
143: void yearly(int);
1.13 tedu 144: int parsemonth(const char *);
1.1 deraadt 145:
146: int
1.10 deraadt 147: main(int argc, char *argv[])
1.1 deraadt 148: {
149: struct tm *local_time;
150: time_t now;
151: int ch, month, year, yflag;
1.20 tedu 152: const char *errstr;
1.1 deraadt 153:
1.6 deraadt 154: yflag = year = 0;
1.23 pyr 155: while ((ch = getopt(argc, argv, "jmwy")) != -1)
1.1 deraadt 156: switch(ch) {
157: case 'j':
158: julian = 1;
159: break;
1.22 pyr 160: case 'm':
161: mflag = 1;
162: break;
1.23 pyr 163: case 'w':
164: wflag = 1;
165: break;
1.1 deraadt 166: case 'y':
167: yflag = 1;
168: break;
169: case '?':
170: default:
171: usage();
172: }
173: argc -= optind;
174: argv += optind;
175:
1.23 pyr 176: if (julian && wflag)
177: usage();
178:
1.22 pyr 179: day_headings = DAY_HEADINGS_S;
180: sep1752 = sep1752s;
181: if (mflag && julian) {
182: sep1752 = sep1752jm;
183: day_headings = DAY_HEADINGS_JM;
184: } else if (mflag) {
185: sep1752 = sep1752m;
186: day_headings = DAY_HEADINGS_M;
187: } else if (julian) {
188: sep1752 = sep1752js;
189: day_headings = DAY_HEADINGS_JS;
190: }
191:
1.1 deraadt 192: month = 0;
193: switch(argc) {
194: case 2:
1.12 tedu 195: month = parsemonth(*argv++);
196: if (!month)
197: errx(1, "Unable to parse month");
1.1 deraadt 198: /* FALLTHROUGH */
199: case 1:
1.12 tedu 200: if (argc == 1 && !isdigit(*argv[0])) {
201: month = parsemonth(*argv);
202: if (!month)
203: errx(1, "illegal year value: use 1-9999");
204: (void)time(&now);
205: local_time = localtime(&now);
206: year = local_time->tm_year + TM_YEAR_BASE;
207: } else {
1.20 tedu 208: year = strtonum(*argv, 1, 9999, &errstr);
209: if (errstr)
1.12 tedu 210: errx(1, "illegal year value: use 1-9999");
211: }
1.1 deraadt 212: break;
213: case 0:
214: (void)time(&now);
215: local_time = localtime(&now);
1.5 deraadt 216: year = local_time->tm_year + TM_YEAR_BASE;
1.1 deraadt 217: if (!yflag)
218: month = local_time->tm_mon + 1;
219: break;
220: default:
221: usage();
222: }
223:
224: if (month)
225: monthly(month, year);
226: else if (julian)
227: j_yearly(year);
228: else
229: yearly(year);
230: exit(0);
231: }
232:
233: #define DAY_LEN 3 /* 3 spaces per day */
234: #define J_DAY_LEN 4 /* 4 spaces per day */
235: #define WEEK_LEN 20 /* 7 * 3 - one space at the end */
1.23 pyr 236: #define WEEKNUMBER_LEN 5 /* 5 spaces per week number */
1.1 deraadt 237: #define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */
238: #define HEAD_SEP 2 /* spaces between day headings */
239: #define J_HEAD_SEP 2
240:
1.23 pyr 241: int
242: week(int day, int month, int year)
243: {
244: int yearday;
245: int firstweekday;
246: int weekday;
247: int firstday;
248: int firstsunday;
249: int shift;
1.24 otto 250:
251: if (mflag)
252: return isoweek(day, month, year);
1.23 pyr 253:
254: yearday = day_in_year(day, month, year);
255: firstweekday = day_in_week(1, 1, year) + 1;
256: weekday = day_in_week(day, month, year) + 1;
1.24 otto 257: firstday = day_in_year(1, 1, year);
1.23 pyr 258: firstsunday = firstday + (8 - firstweekday);
259:
260: shift = 1;
261: if (yearday < firstsunday)
262: return (1);
263: if (firstweekday > THURSDAY - 1)
264: shift = 2;
265: return ((((yearday + 1) - (weekday - 1)) / 7) + shift);
266: }
267:
1.24 otto 268: int
269: isoweek(int day, int month, int year)
270: {
271: /* http://www.tondering.dk/claus/cal/node8.html */
272: int a, b, c, s, e, f, g, d, n;
273:
274: a = month <= 2 ? year - 1 : year;
275: b = a/4 - a/100 + a/400;
276: c = (a-1)/4 - (a-1)/100 + (a-1)/400;
277: s = b - c;
278: if (month <= 2) {
279: e = 0;
280: f = day - 1 + 31 * (month-1);
281: } else {
282: e = s + 1;
283: f = day + ((153 * (month-3) + 2) / 5) + 58 + s;
284: }
285: g = (a + b) % 7;
286: d = (f + g - e) % 7;
287: n = f + 3 - d;
288:
289: if (n < 0)
290: return 53 - (g - s) / 5;
291: else if (n > 364 + s)
292: return 1;
293: else
294: return n/7 + 1;
295: }
296:
1.1 deraadt 297: void
1.10 deraadt 298: monthly(int month, int year)
1.1 deraadt 299: {
1.23 pyr 300: int col, row, len, days[MAXDAYS], firstday;
1.1 deraadt 301: char *p, lineout[30];
302:
303: day_array(month, year, days);
1.19 ray 304: (void)snprintf(lineout, sizeof(lineout), "%s %d",
1.8 deraadt 305: month_names[month - 1], year);
1.11 deraadt 306: len = strlen(lineout);
1.1 deraadt 307: (void)printf("%*s%s\n%s\n",
308: ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
1.22 pyr 309: lineout, day_headings);
1.1 deraadt 310: for (row = 0; row < 6; row++) {
1.23 pyr 311: firstday = SPACE;
1.1 deraadt 312: for (col = 0, p = lineout; col < 7; col++,
1.23 pyr 313: p += julian ? J_DAY_LEN : DAY_LEN) {
314: if (firstday == SPACE && days[row * 7 + col] != SPACE)
315: firstday = days[row * 7 + col];
1.1 deraadt 316: ascii_day(p, days[row * 7 + col]);
1.23 pyr 317: }
1.1 deraadt 318: *p = '\0';
319: trim_trailing_spaces(lineout);
1.23 pyr 320: (void)printf("%-20s", lineout);
321: if (wflag && firstday != SPACE)
1.24 otto 322: printf(" [%2d]", week(firstday, month, year));
1.23 pyr 323: printf("\n");
1.1 deraadt 324: }
325: }
326:
327: void
1.10 deraadt 328: j_yearly(int year)
1.1 deraadt 329: {
330: int col, *dp, i, month, row, which_cal;
331: int days[12][MAXDAYS];
332: char *p, lineout[80];
333:
1.19 ray 334: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.1 deraadt 335: center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
336: (void)printf("\n\n");
337: for (i = 0; i < 12; i++)
338: day_array(i + 1, year, days[i]);
339: (void)memset(lineout, ' ', sizeof(lineout) - 1);
340: lineout[sizeof(lineout) - 1] = '\0';
341: for (month = 0; month < 12; month += 2) {
342: center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
343: center(month_names[month + 1], J_WEEK_LEN, 0);
1.22 pyr 344: (void)printf("\n%s%*s%s\n", day_headings,
345: J_HEAD_SEP, "", day_headings);
346:
1.1 deraadt 347: for (row = 0; row < 6; row++) {
348: for (which_cal = 0; which_cal < 2; which_cal++) {
349: p = lineout + which_cal * (J_WEEK_LEN + 2);
350: dp = &days[month + which_cal][row * 7];
351: for (col = 0; col < 7; col++, p += J_DAY_LEN)
352: ascii_day(p, *dp++);
353: }
354: *p = '\0';
355: trim_trailing_spaces(lineout);
356: (void)printf("%s\n", lineout);
357: }
358: }
359: (void)printf("\n");
360: }
361:
362: void
1.10 deraadt 363: yearly(int year)
1.1 deraadt 364: {
1.23 pyr 365: int col, *dp, i, month, row, which_cal, week_len, wn, firstday;
1.1 deraadt 366: int days[12][MAXDAYS];
1.23 pyr 367: char *p, lineout[81];
1.1 deraadt 368:
1.23 pyr 369: week_len = WEEK_LEN;
370: if (wflag)
371: week_len += WEEKNUMBER_LEN;
1.19 ray 372: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.23 pyr 373: center(lineout, week_len * 3 + HEAD_SEP * 2, 0);
1.1 deraadt 374: (void)printf("\n\n");
375: for (i = 0; i < 12; i++)
376: day_array(i + 1, year, days[i]);
377: (void)memset(lineout, ' ', sizeof(lineout) - 1);
378: lineout[sizeof(lineout) - 1] = '\0';
379: for (month = 0; month < 12; month += 3) {
1.23 pyr 380: center(month_names[month], week_len, HEAD_SEP);
381: center(month_names[month + 1], week_len, HEAD_SEP);
382: center(month_names[month + 2], week_len, 0);
1.22 pyr 383: (void)printf("\n%s%*s%s%*s%s\n", day_headings,
1.23 pyr 384: HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings,
385: HEAD_SEP + (wflag ? WEEKNUMBER_LEN : 0), "", day_headings);
1.22 pyr 386:
1.1 deraadt 387: for (row = 0; row < 6; row++) {
388: for (which_cal = 0; which_cal < 3; which_cal++) {
1.23 pyr 389: p = lineout + which_cal * (week_len + 2);
390:
1.1 deraadt 391: dp = &days[month + which_cal][row * 7];
1.23 pyr 392: firstday = SPACE;
393: for (col = 0; col < 7; col++, p += DAY_LEN) {
394: if (firstday == SPACE && *dp != SPACE)
395: firstday = *dp;
1.1 deraadt 396: ascii_day(p, *dp++);
1.23 pyr 397: }
398: if (wflag && firstday != SPACE) {
1.24 otto 399: wn = week(firstday,
1.23 pyr 400: month + which_cal + 1, year);
401: (void)snprintf(p, 5, "[%2d]", wn);
402: p += strlen(p);
403: *p = ' ';
404: } else
405: memset(p, ' ', 4);
1.1 deraadt 406: }
407: *p = '\0';
408: trim_trailing_spaces(lineout);
409: (void)printf("%s\n", lineout);
410: }
411: }
412: (void)printf("\n");
413: }
414:
415: /*
416: * day_array --
417: * Fill in an array of 42 integers with a calendar. Assume for a moment
418: * that you took the (maximum) 6 rows in a calendar and stretched them
419: * out end to end. You would have 42 numbers or spaces. This routine
420: * builds that array for any month from Jan. 1 through Dec. 9999.
421: */
422: void
1.10 deraadt 423: day_array(int month, int year, int *days)
1.1 deraadt 424: {
425: int day, dw, dm;
426:
427: if (month == 9 && year == 1752) {
1.22 pyr 428: memmove(days, sep1752, MAXDAYS * sizeof(int));
1.1 deraadt 429: return;
430: }
431: memmove(days, empty, MAXDAYS * sizeof(int));
432: dm = days_in_month[leap_year(year)][month];
1.22 pyr 433: dw = day_in_week(mflag?0:1, month, year);
1.1 deraadt 434: day = julian ? day_in_year(1, month, year) : 1;
435: while (dm--)
436: days[dw++] = day++;
437: }
438:
439: /*
440: * day_in_year --
441: * return the 1 based day number within the year
442: */
443: int
1.10 deraadt 444: day_in_year(int day, int month, int year)
1.1 deraadt 445: {
446: int i, leap;
447:
448: leap = leap_year(year);
449: for (i = 1; i < month; i++)
450: day += days_in_month[leap][i];
451: return (day);
452: }
453:
454: /*
455: * day_in_week
456: * return the 0 based day number for any date from 1 Jan. 1 to
457: * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
458: * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
459: * missing days.
460: */
461: int
1.10 deraadt 462: day_in_week(int day, int month, int year)
1.1 deraadt 463: {
464: long temp;
465:
466: temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
467: + day_in_year(day, month, year);
468: if (temp < FIRST_MISSING_DAY)
469: return ((temp - 1 + SATURDAY) % 7);
470: if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
471: return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
472: return (THURSDAY);
473: }
474:
475: void
1.10 deraadt 476: ascii_day(char *p, int day)
1.1 deraadt 477: {
478: int display, val;
1.13 tedu 479: static const char *aday[] = {
1.1 deraadt 480: "",
481: " 1", " 2", " 3", " 4", " 5", " 6", " 7",
482: " 8", " 9", "10", "11", "12", "13", "14",
483: "15", "16", "17", "18", "19", "20", "21",
484: "22", "23", "24", "25", "26", "27", "28",
485: "29", "30", "31",
486: };
487:
488: if (day == SPACE) {
489: memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
490: return;
491: }
492: if (julian) {
1.5 deraadt 493: val = day / 100;
494: if (val) {
1.1 deraadt 495: day %= 100;
496: *p++ = val + '0';
497: display = 1;
498: } else {
499: *p++ = ' ';
500: display = 0;
501: }
502: val = day / 10;
503: if (val || display)
504: *p++ = val + '0';
505: else
506: *p++ = ' ';
507: *p++ = day % 10 + '0';
508: } else {
509: *p++ = aday[day][0];
510: *p++ = aday[day][1];
511: }
512: *p = ' ';
513: }
514:
515: void
1.10 deraadt 516: trim_trailing_spaces(char *s)
1.1 deraadt 517: {
518: char *p;
519:
520: for (p = s; *p; ++p)
521: continue;
522: while (p > s && isspace(*--p))
523: continue;
524: if (p > s)
525: ++p;
526: *p = '\0';
527: }
528:
529: void
1.13 tedu 530: center(const char *str, int len, int separate)
1.1 deraadt 531: {
532:
533: len -= strlen(str);
1.21 tom 534: (void)printf("%*s%s%*s", len / 2, "", str,
535: len / 2 + len % 2 + separate, "");
1.1 deraadt 536: }
537:
538: void
1.10 deraadt 539: usage(void)
1.1 deraadt 540: {
541:
1.23 pyr 542: (void)fprintf(stderr, "usage: cal [-jmwy] [month] [year]\n");
1.1 deraadt 543: exit(1);
1.12 tedu 544: }
545:
546: int
547: parsemonth(const char *s)
548: {
1.15 deraadt 549: struct tm tm;
550: char *cp;
1.12 tedu 551: int v;
552:
553: v = (int)strtol(s, &cp, 10);
1.17 tom 554: if (*cp != '\0') { /* s wasn't purely numeric */
555: v = 0;
556: if ((cp = strptime(s, "%b", &tm)) != NULL && *cp == '\0')
557: v = tm.tm_mon + 1;
558: }
1.15 deraadt 559: if (v <= 0 || v > 12)
1.17 tom 560: errx(1, "invalid month: use 1-12 or a name");
1.15 deraadt 561: return (v);
1.1 deraadt 562: }
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