Annotation of src/usr.bin/cal/cal.c, Revision 1.19
1.19 ! ray 1: /* $OpenBSD: cal.c,v 1.18 2005/12/08 14:54:30 jmc 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: #ifndef lint
1.13 tedu 37: static const char copyright[] =
1.1 deraadt 38: "@(#) Copyright (c) 1989, 1993, 1994\n\
39: The Regents of the University of California. All rights reserved.\n";
40: #if 0
41: static char sccsid[] = "@(#)cal.c 8.4 (Berkeley) 4/2/94";
42: #else
1.19 ! ray 43: static const char rcsid[] = "$OpenBSD: cal.c,v 1.18 2005/12/08 14:54:30 jmc Exp $";
1.1 deraadt 44: #endif
45: #endif /* not lint */
46:
47: #include <sys/types.h>
48:
49: #include <ctype.h>
50: #include <err.h>
51: #include <stdio.h>
52: #include <stdlib.h>
53: #include <string.h>
54: #include <time.h>
1.5 deraadt 55: #include <tzfile.h>
1.1 deraadt 56: #include <unistd.h>
57:
58: #define THURSDAY 4 /* for reformation */
1.14 deraadt 59: #define SATURDAY 6 /* 1 Jan 1 was a Saturday */
1.1 deraadt 60:
1.14 deraadt 61: #define FIRST_MISSING_DAY 639799 /* 3 Sep 1752 */
62: #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
1.1 deraadt 63:
64: #define MAXDAYS 42 /* max slots in a month array */
65: #define SPACE -1 /* used in day array */
66:
1.13 tedu 67: static const int days_in_month[2][13] = {
1.1 deraadt 68: {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
69: {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
70: };
71:
1.13 tedu 72: const int sep1752[MAXDAYS] = {
1.1 deraadt 73: SPACE, SPACE, 1, 2, 14, 15, 16,
74: 17, 18, 19, 20, 21, 22, 23,
75: 24, 25, 26, 27, 28, 29, 30,
76: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
77: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
78: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
79: }, j_sep1752[MAXDAYS] = {
80: SPACE, SPACE, 245, 246, 258, 259, 260,
81: 261, 262, 263, 264, 265, 266, 267,
82: 268, 269, 270, 271, 272, 273, 274,
83: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
84: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
85: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
86: }, empty[MAXDAYS] = {
87: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
88: SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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: };
94:
1.13 tedu 95: const char *month_names[12] = {
1.1 deraadt 96: "January", "February", "March", "April", "May", "June",
97: "July", "August", "September", "October", "November", "December",
98: };
99:
1.13 tedu 100: const char *day_headings = "Su Mo Tu We Th Fr Sa";
101: const char *j_day_headings = " Su Mo Tu We Th Fr Sa";
1.1 deraadt 102:
103: /* leap year -- account for gregorian reformation in 1752 */
104: #define leap_year(yr) \
105: ((yr) <= 1752 ? !((yr) % 4) : \
1.5 deraadt 106: (!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
1.1 deraadt 107:
108: /* number of centuries since 1700, not inclusive */
109: #define centuries_since_1700(yr) \
110: ((yr) > 1700 ? (yr) / 100 - 17 : 0)
111:
112: /* number of centuries since 1700 whose modulo of 400 is 0 */
113: #define quad_centuries_since_1700(yr) \
114: ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
115:
116: /* number of leap years between year 1 and this year, not inclusive */
117: #define leap_years_since_year_1(yr) \
118: ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
119:
120: int julian;
121:
1.7 millert 122: void ascii_day(char *, int);
1.13 tedu 123: void center(const char *, int, int);
1.7 millert 124: void day_array(int, int, int *);
125: int day_in_week(int, int, int);
126: int day_in_year(int, int, int);
127: void j_yearly(int);
128: void monthly(int, int);
129: void trim_trailing_spaces(char *);
130: void usage(void);
131: void yearly(int);
1.13 tedu 132: int parsemonth(const char *);
1.1 deraadt 133:
134: int
1.10 deraadt 135: main(int argc, char *argv[])
1.1 deraadt 136: {
137: struct tm *local_time;
138: time_t now;
139: int ch, month, year, yflag;
140:
1.6 deraadt 141: yflag = year = 0;
1.4 millert 142: while ((ch = getopt(argc, argv, "jy")) != -1)
1.1 deraadt 143: switch(ch) {
144: case 'j':
145: julian = 1;
146: break;
147: case 'y':
148: yflag = 1;
149: break;
150: case '?':
151: default:
152: usage();
153: }
154: argc -= optind;
155: argv += optind;
156:
157: month = 0;
158: switch(argc) {
159: case 2:
1.12 tedu 160: month = parsemonth(*argv++);
161: if (!month)
162: errx(1, "Unable to parse month");
1.1 deraadt 163: /* FALLTHROUGH */
164: case 1:
1.12 tedu 165: if (argc == 1 && !isdigit(*argv[0])) {
166: month = parsemonth(*argv);
167: if (!month)
168: errx(1, "illegal year value: use 1-9999");
169: (void)time(&now);
170: local_time = localtime(&now);
171: year = local_time->tm_year + TM_YEAR_BASE;
172: } else {
173: if ((year = atoi(*argv)) < 1 || year > 9999)
174: errx(1, "illegal year value: use 1-9999");
175: }
1.1 deraadt 176: break;
177: case 0:
178: (void)time(&now);
179: local_time = localtime(&now);
1.5 deraadt 180: year = local_time->tm_year + TM_YEAR_BASE;
1.1 deraadt 181: if (!yflag)
182: month = local_time->tm_mon + 1;
183: break;
184: default:
185: usage();
186: }
187:
188: if (month)
189: monthly(month, year);
190: else if (julian)
191: j_yearly(year);
192: else
193: yearly(year);
194: exit(0);
195: }
196:
197: #define DAY_LEN 3 /* 3 spaces per day */
198: #define J_DAY_LEN 4 /* 4 spaces per day */
199: #define WEEK_LEN 20 /* 7 * 3 - one space at the end */
200: #define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */
201: #define HEAD_SEP 2 /* spaces between day headings */
202: #define J_HEAD_SEP 2
203:
204: void
1.10 deraadt 205: monthly(int month, int year)
1.1 deraadt 206: {
207: int col, row, len, days[MAXDAYS];
208: char *p, lineout[30];
209:
210: day_array(month, year, days);
1.19 ! ray 211: (void)snprintf(lineout, sizeof(lineout), "%s %d",
1.8 deraadt 212: month_names[month - 1], year);
1.11 deraadt 213: len = strlen(lineout);
1.1 deraadt 214: (void)printf("%*s%s\n%s\n",
215: ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
216: lineout, julian ? j_day_headings : day_headings);
217: for (row = 0; row < 6; row++) {
218: for (col = 0, p = lineout; col < 7; col++,
219: p += julian ? J_DAY_LEN : DAY_LEN)
220: ascii_day(p, days[row * 7 + col]);
221: *p = '\0';
222: trim_trailing_spaces(lineout);
223: (void)printf("%s\n", lineout);
224: }
225: }
226:
227: void
1.10 deraadt 228: j_yearly(int year)
1.1 deraadt 229: {
230: int col, *dp, i, month, row, which_cal;
231: int days[12][MAXDAYS];
232: char *p, lineout[80];
233:
1.19 ! ray 234: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.1 deraadt 235: center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
236: (void)printf("\n\n");
237: for (i = 0; i < 12; i++)
238: day_array(i + 1, year, days[i]);
239: (void)memset(lineout, ' ', sizeof(lineout) - 1);
240: lineout[sizeof(lineout) - 1] = '\0';
241: for (month = 0; month < 12; month += 2) {
242: center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
243: center(month_names[month + 1], J_WEEK_LEN, 0);
244: (void)printf("\n%s%*s%s\n", j_day_headings, J_HEAD_SEP, "",
245: j_day_headings);
246: for (row = 0; row < 6; row++) {
247: for (which_cal = 0; which_cal < 2; which_cal++) {
248: p = lineout + which_cal * (J_WEEK_LEN + 2);
249: dp = &days[month + which_cal][row * 7];
250: for (col = 0; col < 7; col++, p += J_DAY_LEN)
251: ascii_day(p, *dp++);
252: }
253: *p = '\0';
254: trim_trailing_spaces(lineout);
255: (void)printf("%s\n", lineout);
256: }
257: }
258: (void)printf("\n");
259: }
260:
261: void
1.10 deraadt 262: yearly(int year)
1.1 deraadt 263: {
264: int col, *dp, i, month, row, which_cal;
265: int days[12][MAXDAYS];
266: char *p, lineout[80];
267:
1.19 ! ray 268: (void)snprintf(lineout, sizeof(lineout), "%d", year);
1.1 deraadt 269: center(lineout, WEEK_LEN * 3 + HEAD_SEP * 2, 0);
270: (void)printf("\n\n");
271: for (i = 0; i < 12; i++)
272: day_array(i + 1, year, days[i]);
273: (void)memset(lineout, ' ', sizeof(lineout) - 1);
274: lineout[sizeof(lineout) - 1] = '\0';
275: for (month = 0; month < 12; month += 3) {
276: center(month_names[month], WEEK_LEN, HEAD_SEP);
277: center(month_names[month + 1], WEEK_LEN, HEAD_SEP);
278: center(month_names[month + 2], WEEK_LEN, 0);
279: (void)printf("\n%s%*s%s%*s%s\n", day_headings, HEAD_SEP,
280: "", day_headings, HEAD_SEP, "", day_headings);
281: for (row = 0; row < 6; row++) {
282: for (which_cal = 0; which_cal < 3; which_cal++) {
283: p = lineout + which_cal * (WEEK_LEN + 2);
284: dp = &days[month + which_cal][row * 7];
285: for (col = 0; col < 7; col++, p += DAY_LEN)
286: ascii_day(p, *dp++);
287: }
288: *p = '\0';
289: trim_trailing_spaces(lineout);
290: (void)printf("%s\n", lineout);
291: }
292: }
293: (void)printf("\n");
294: }
295:
296: /*
297: * day_array --
298: * Fill in an array of 42 integers with a calendar. Assume for a moment
299: * that you took the (maximum) 6 rows in a calendar and stretched them
300: * out end to end. You would have 42 numbers or spaces. This routine
301: * builds that array for any month from Jan. 1 through Dec. 9999.
302: */
303: void
1.10 deraadt 304: day_array(int month, int year, int *days)
1.1 deraadt 305: {
306: int day, dw, dm;
307:
308: if (month == 9 && year == 1752) {
309: memmove(days,
1.13 tedu 310: julian ? j_sep1752 : sep1752, MAXDAYS * sizeof(int));
1.1 deraadt 311: return;
312: }
313: memmove(days, empty, MAXDAYS * sizeof(int));
314: dm = days_in_month[leap_year(year)][month];
315: dw = day_in_week(1, month, year);
316: day = julian ? day_in_year(1, month, year) : 1;
317: while (dm--)
318: days[dw++] = day++;
319: }
320:
321: /*
322: * day_in_year --
323: * return the 1 based day number within the year
324: */
325: int
1.10 deraadt 326: day_in_year(int day, int month, int year)
1.1 deraadt 327: {
328: int i, leap;
329:
330: leap = leap_year(year);
331: for (i = 1; i < month; i++)
332: day += days_in_month[leap][i];
333: return (day);
334: }
335:
336: /*
337: * day_in_week
338: * return the 0 based day number for any date from 1 Jan. 1 to
339: * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
340: * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
341: * missing days.
342: */
343: int
1.10 deraadt 344: day_in_week(int day, int month, int year)
1.1 deraadt 345: {
346: long temp;
347:
348: temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
349: + day_in_year(day, month, year);
350: if (temp < FIRST_MISSING_DAY)
351: return ((temp - 1 + SATURDAY) % 7);
352: if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
353: return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
354: return (THURSDAY);
355: }
356:
357: void
1.10 deraadt 358: ascii_day(char *p, int day)
1.1 deraadt 359: {
360: int display, val;
1.13 tedu 361: static const char *aday[] = {
1.1 deraadt 362: "",
363: " 1", " 2", " 3", " 4", " 5", " 6", " 7",
364: " 8", " 9", "10", "11", "12", "13", "14",
365: "15", "16", "17", "18", "19", "20", "21",
366: "22", "23", "24", "25", "26", "27", "28",
367: "29", "30", "31",
368: };
369:
370: if (day == SPACE) {
371: memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
372: return;
373: }
374: if (julian) {
1.5 deraadt 375: val = day / 100;
376: if (val) {
1.1 deraadt 377: day %= 100;
378: *p++ = val + '0';
379: display = 1;
380: } else {
381: *p++ = ' ';
382: display = 0;
383: }
384: val = day / 10;
385: if (val || display)
386: *p++ = val + '0';
387: else
388: *p++ = ' ';
389: *p++ = day % 10 + '0';
390: } else {
391: *p++ = aday[day][0];
392: *p++ = aday[day][1];
393: }
394: *p = ' ';
395: }
396:
397: void
1.10 deraadt 398: trim_trailing_spaces(char *s)
1.1 deraadt 399: {
400: char *p;
401:
402: for (p = s; *p; ++p)
403: continue;
404: while (p > s && isspace(*--p))
405: continue;
406: if (p > s)
407: ++p;
408: *p = '\0';
409: }
410:
411: void
1.13 tedu 412: center(const char *str, int len, int separate)
1.1 deraadt 413: {
414:
415: len -= strlen(str);
416: (void)printf("%*s%s%*s", len / 2, "", str, len / 2 + len % 2, "");
417: if (separate)
418: (void)printf("%*s", separate, "");
419: }
420:
421: void
1.10 deraadt 422: usage(void)
1.1 deraadt 423: {
424:
1.18 jmc 425: (void)fprintf(stderr, "usage: cal [-jy] [month] [year]\n");
1.1 deraadt 426: exit(1);
1.12 tedu 427: }
428:
429: int
430: parsemonth(const char *s)
431: {
1.15 deraadt 432: struct tm tm;
433: char *cp;
1.12 tedu 434: int v;
435:
436: v = (int)strtol(s, &cp, 10);
1.17 tom 437: if (*cp != '\0') { /* s wasn't purely numeric */
438: v = 0;
439: if ((cp = strptime(s, "%b", &tm)) != NULL && *cp == '\0')
440: v = tm.tm_mon + 1;
441: }
1.15 deraadt 442: if (v <= 0 || v > 12)
1.17 tom 443: errx(1, "invalid month: use 1-12 or a name");
1.15 deraadt 444: return (v);
1.1 deraadt 445: }
![[BACK]](/icons/back.gif){kind=icon}
Return to cal.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / src / usr.bin / cal