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authorEric Andersen <andersen@codepoet.org>2001-12-06 15:16:43 +0000
committerEric Andersen <andersen@codepoet.org>2001-12-06 15:16:43 +0000
commitc98c06233e8ac24ebf75ddae68f1f1a3a95a3bd1 (patch)
tree2529ea61e3d5d53420062d391a647995cfce4ca4 /coreutils/cal.c
parentb24d65659f193cd7497dfdae4d8aa1bc91dbf343 (diff)
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Merge in the cal applet from Steve Merrifield <steve@labyrinth.net.au>
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1/*
2 * Calendar implementation for busybox
3 *
4 * Copyright (C) 2001 by Steven J. Merrifield <steve@labyrinth.net.au>
5 *
6 * See original copyright at the end of this file
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21 *
22*/
23
24
25#include <sys/types.h>
26#include <ctype.h>
27#include <err.h>
28#include <stdio.h>
29#include <stdlib.h>
30#include <string.h>
31#include <time.h>
32#include <unistd.h>
33
34#ifdef CONFIG_LOCALE_SUPPORT
35#include <locale.h>
36#endif
37
38#include "busybox.h"
39
40#define THURSDAY 4 /* for reformation */
41#define SATURDAY 6 /* 1 Jan 1 was a Saturday */
42
43#define FIRST_MISSING_DAY 639787 /* 3 Sep 1752 */
44#define NUMBER_MISSING_DAYS 11 /* 11 day correction */
45
46#define MAXDAYS 42 /* max slots in a month array */
47#define SPACE -1 /* used in day array */
48
49static int days_in_month[2][13] = {
50 {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
51 {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
52};
53
54int sep1752[MAXDAYS] = {
55 SPACE, SPACE, 1, 2, 14, 15, 16,
56 17, 18, 19, 20, 21, 22, 23,
57 24, 25, 26, 27, 28, 29, 30,
58 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
59 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
60 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
61}, j_sep1752[MAXDAYS] = {
62 SPACE, SPACE, 245, 246, 258, 259, 260,
63 261, 262, 263, 264, 265, 266, 267,
64 268, 269, 270, 271, 272, 273, 274,
65 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
66 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
67 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
68}, empty[MAXDAYS] = {
69 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
70 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, 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 SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
75};
76
77char *month_names[12];
78
79char day_headings[] = " ";
80char j_day_headings[] = " ";
81
82/* leap year -- account for gregorian reformation in 1752 */
83#define leap_year(yr) \
84 ((yr) <= 1752 ? !((yr) % 4) : \
85 (!((yr) % 4) && ((yr) % 100)) || !((yr) % 400))
86
87/* number of centuries since 1700, not inclusive */
88#define centuries_since_1700(yr) \
89 ((yr) > 1700 ? (yr) / 100 - 17 : 0)
90
91/* number of centuries since 1700 whose modulo of 400 is 0 */
92#define quad_centuries_since_1700(yr) \
93 ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
94
95/* number of leap years between year 1 and this year, not inclusive */
96#define leap_years_since_year_1(yr) \
97 ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
98
99int julian;
100void ascii_day __P((char *, int));
101void center __P((char *, int, int));
102void day_array __P((int, int, int *));
103int day_in_week __P((int, int, int));
104int day_in_year __P((int, int, int));
105void j_yearly __P((int));
106void monthly __P((int, int));
107void trim_trailing_spaces __P((char *));
108void yearly __P((int));
109
110int cal_main(int argc, char **argv)
111{
112 struct tm *local_time;
113 static struct tm zero_tm;
114 time_t now;
115 int ch, month, year, yflag, i;
116 char buf[40];
117
118#ifdef CONFIG_LOCALE_SUPPORT
119 setlocale(LC_TIME, "");
120#endif
121
122 yflag = 0;
123 while ((ch = getopt(argc, argv, "jy")) != -1)
124 switch(ch) {
125 case 'j':
126 julian = 1;
127 break;
128 case 'y':
129 yflag = 1;
130 break;
131 default:
132 show_usage();
133 }
134 argc -= optind;
135 argv += optind;
136
137 month = 0;
138 switch(argc) {
139 case 2:
140 if ((month = atoi(*argv++)) < 1 || month > 12)
141 error_msg_and_die("Illegal month value: use 1-12");
142 /* FALLTHROUGH */
143 case 1:
144 if ((year = atoi(*argv)) < 1 || year > 9999)
145 error_msg_and_die("Illegal year value: use 1-9999");
146 break;
147 case 0:
148 time(&now);
149 local_time = localtime(&now);
150 year = local_time->tm_year + 1900;
151 if (!yflag)
152 month = local_time->tm_mon + 1;
153 break;
154 default:
155 show_usage();
156 }
157
158 for (i = 0; i < 12; i++) {
159 zero_tm.tm_mon = i;
160 strftime(buf, sizeof(buf), "%B", &zero_tm);
161 month_names[i] = xstrdup(buf);
162 }
163 for (i = 0; i < 7; i++) {
164 zero_tm.tm_wday = i;
165 strftime(buf, sizeof(buf), "%a", &zero_tm);
166 strncpy(day_headings + i * 3, buf, 2);
167 strncpy(j_day_headings + i * 4 + 1, buf, 2);
168 }
169
170 if (month)
171 monthly(month, year);
172 else if (julian)
173 j_yearly(year);
174 else
175 yearly(year);
176 exit(0);
177}
178
179#define DAY_LEN 3 /* 3 spaces per day */
180#define J_DAY_LEN 4 /* 4 spaces per day */
181#define WEEK_LEN 20 /* 7 * 3 - one space at the end */
182#define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */
183#define HEAD_SEP 2 /* spaces between day headings */
184#define J_HEAD_SEP 2
185
186void monthly(int month, int year)
187{
188 int col, row, len, days[MAXDAYS];
189 char *p, lineout[30];
190
191 day_array(month, year, days);
192 len = sprintf(lineout, "%s %d", month_names[month - 1], year);
193 printf("%*s%s\n%s\n",
194 ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
195 lineout, julian ? j_day_headings : day_headings);
196 for (row = 0; row < 6; row++) {
197 for (col = 0, p = lineout; col < 7; col++,
198 p += julian ? J_DAY_LEN : DAY_LEN)
199 ascii_day(p, days[row * 7 + col]);
200 *p = '\0';
201 trim_trailing_spaces(lineout);
202 printf("%s\n", lineout);
203 }
204}
205
206void j_yearly(int year)
207{
208 int col, *dp, i, month, row, which_cal;
209 int days[12][MAXDAYS];
210 char *p, lineout[80];
211
212 sprintf(lineout, "%d", year);
213 center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
214 printf("\n\n");
215 for (i = 0; i < 12; i++)
216 day_array(i + 1, year, days[i]);
217 memset(lineout, ' ', sizeof(lineout) - 1);
218 lineout[sizeof(lineout) - 1] = '\0';
219 for (month = 0; month < 12; month += 2) {
220 center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
221 center(month_names[month + 1], J_WEEK_LEN, 0);
222 printf("\n%s%*s%s\n", j_day_headings, J_HEAD_SEP, "",
223 j_day_headings);
224 for (row = 0; row < 6; row++) {
225 for (which_cal = 0; which_cal < 2; which_cal++) {
226 p = lineout + which_cal * (J_WEEK_LEN + 2);
227 dp = &days[month + which_cal][row * 7];
228 for (col = 0; col < 7; col++, p += J_DAY_LEN)
229 ascii_day(p, *dp++);
230 }
231 *p = '\0';
232 trim_trailing_spaces(lineout);
233 printf("%s\n", lineout);
234 }
235 }
236 printf("\n");
237}
238
239void yearly(int year)
240{
241 int col, *dp, i, month, row, which_cal;
242 int days[12][MAXDAYS];
243 char *p, lineout[80];
244
245 sprintf(lineout, "%d", year);
246 center(lineout, WEEK_LEN * 3 + HEAD_SEP * 2, 0);
247 printf("\n\n");
248 for (i = 0; i < 12; i++)
249 day_array(i + 1, year, days[i]);
250 memset(lineout, ' ', sizeof(lineout) - 1);
251 lineout[sizeof(lineout) - 1] = '\0';
252 for (month = 0; month < 12; month += 3) {
253 center(month_names[month], WEEK_LEN, HEAD_SEP);
254 center(month_names[month + 1], WEEK_LEN, HEAD_SEP);
255 center(month_names[month + 2], WEEK_LEN, 0);
256 printf("\n%s%*s%s%*s%s\n", day_headings, HEAD_SEP,
257 "", day_headings, HEAD_SEP, "", day_headings);
258 for (row = 0; row < 6; row++) {
259 for (which_cal = 0; which_cal < 3; which_cal++) {
260 p = lineout + which_cal * (WEEK_LEN + 2);
261 dp = &days[month + which_cal][row * 7];
262 for (col = 0; col < 7; col++, p += DAY_LEN)
263 ascii_day(p, *dp++);
264 }
265 *p = '\0';
266 trim_trailing_spaces(lineout);
267 printf("%s\n", lineout);
268 }
269 }
270 printf("\n");
271}
272
273/*
274 * day_array --
275 * Fill in an array of 42 integers with a calendar. Assume for a moment
276 * that you took the (maximum) 6 rows in a calendar and stretched them
277 * out end to end. You would have 42 numbers or spaces. This routine
278 * builds that array for any month from Jan. 1 through Dec. 9999.
279 */
280void day_array(int month, int year, int *days)
281{
282 int day, dw, dm;
283
284 if ((month == 9) && (year == 1752)) {
285 memmove(days,
286 julian ? j_sep1752 : sep1752, MAXDAYS * sizeof(int));
287 return;
288 }
289 memmove(days, empty, MAXDAYS * sizeof(int));
290 dm = days_in_month[leap_year(year)][month];
291 dw = day_in_week(1, month, year);
292 day = julian ? day_in_year(1, month, year) : 1;
293 while (dm--)
294 days[dw++] = day++;
295}
296
297/*
298 * day_in_year --
299 * return the 1 based day number within the year
300 */
301int day_in_year(int day, int month, int year)
302{
303 int i, leap;
304
305 leap = leap_year(year);
306 for (i = 1; i < month; i++)
307 day += days_in_month[leap][i];
308 return (day);
309}
310
311/*
312 * day_in_week
313 * return the 0 based day number for any date from 1 Jan. 1 to
314 * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
315 * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
316 * missing days.
317 */
318int day_in_week(int day, int month, int year)
319{
320 long temp;
321
322 temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
323 + day_in_year(day, month, year);
324 if (temp < FIRST_MISSING_DAY)
325 return ((temp - 1 + SATURDAY) % 7);
326 if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
327 return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
328 return (THURSDAY);
329}
330
331void ascii_day(char *p, int day)
332{
333 int display, val;
334 static char *aday[] = {
335 "",
336 " 1", " 2", " 3", " 4", " 5", " 6", " 7",
337 " 8", " 9", "10", "11", "12", "13", "14",
338 "15", "16", "17", "18", "19", "20", "21",
339 "22", "23", "24", "25", "26", "27", "28",
340 "29", "30", "31",
341 };
342
343 if (day == SPACE) {
344 memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
345 return;
346 }
347 if (julian) {
348 if ((val = day / 100) != 0) {
349 day %= 100;
350 *p++ = val + '0';
351 display = 1;
352 } else {
353 *p++ = ' ';
354 display = 0;
355 }
356 val = day / 10;
357 if (val || display)
358 *p++ = val + '0';
359 else
360 *p++ = ' ';
361 *p++ = day % 10 + '0';
362 } else {
363 *p++ = aday[day][0];
364 *p++ = aday[day][1];
365 }
366 *p = ' ';
367}
368
369void trim_trailing_spaces(char *s)
370{
371 char *p;
372
373 for (p = s; *p; ++p)
374 continue;
375 while (p > s && isspace(*--p))
376 continue;
377 if (p > s)
378 ++p;
379 *p = '\0';
380}
381
382void center(char *str, int len, int separate)
383{
384
385 len -= strlen(str);
386 printf("%*s%s%*s", len / 2, "", str, len / 2 + len % 2, "");
387 if (separate)
388 printf("%*s", separate, "");
389}
390
391
392/*
393 * Copyright (c) 1989, 1993, 1994
394 * The Regents of the University of California. All rights reserved.
395 *
396 * This code is derived from software contributed to Berkeley by
397 * Kim Letkeman.
398 *
399 * Redistribution and use in source and binary forms, with or without
400 * modification, are permitted provided that the following conditions
401 * are met:
402 * 1. Redistributions of source code must retain the above copyright
403 * notice, this list of conditions and the following disclaimer.
404 * 2. Redistributions in binary form must reproduce the above copyright
405 * notice, this list of conditions and the following disclaimer in the
406 * documentation and/or other materials provided with the distribution.
407 * 3. All advertising materials mentioning features or use of this software
408 * must display the following acknowledgement:
409 * This product includes software developed by the University of
410 * California, Berkeley and its contributors.
411 * 4. Neither the name of the University nor the names of its contributors
412 * may be used to endorse or promote products derived from this software
413 * without specific prior written permission.
414 *
415 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
416 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
417 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
418 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
419 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
420 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
421 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
422 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
423 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
424 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
425 * SUCH DAMAGE.
426 */
427
428
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