Contents of /tags/mkinitrd-6_1_5/busybox/coreutils/cal.c
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
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Wed Aug 5 17:52:52 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 9458 byte(s)
tagged 'mkinitrd-6_1_5'
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * Calendar implementation for busybox |
4 | * |
5 | * See original copyright at the end of this file |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
8 | */ |
9 | |
10 | /* BB_AUDIT SUSv3 compliant with -j and -y extensions (from util-linux). */ |
11 | /* BB_AUDIT BUG: The output of 'cal -j 1752' is incorrect. The upstream |
12 | * BB_AUDIT BUG: version in util-linux seems to be broken as well. */ |
13 | /* http://www.opengroup.org/onlinepubs/007904975/utilities/cal.html */ |
14 | |
15 | /* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org) |
16 | * |
17 | * Major size reduction... over 50% (>1.5k) on i386. |
18 | */ |
19 | |
20 | #include "libbb.h" |
21 | |
22 | /* We often use "unsigned" intead of "int", it's easier to div on most CPUs */ |
23 | |
24 | #define THURSDAY 4 /* for reformation */ |
25 | #define SATURDAY 6 /* 1 Jan 1 was a Saturday */ |
26 | |
27 | #define FIRST_MISSING_DAY 639787 /* 3 Sep 1752 */ |
28 | #define NUMBER_MISSING_DAYS 11 /* 11 day correction */ |
29 | |
30 | #define MAXDAYS 42 /* max slots in a month array */ |
31 | #define SPACE -1 /* used in day array */ |
32 | |
33 | static const unsigned char days_in_month[] ALIGN1 = { |
34 | 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 |
35 | }; |
36 | |
37 | static const unsigned char sep1752[] ALIGN1 = { |
38 | 1, 2, 14, 15, 16, |
39 | 17, 18, 19, 20, 21, 22, 23, |
40 | 24, 25, 26, 27, 28, 29, 30 |
41 | }; |
42 | |
43 | /* Set to 0 or 1 in main */ |
44 | #define julian ((unsigned)option_mask32) |
45 | |
46 | /* leap year -- account for Gregorian reformation in 1752 */ |
47 | static int leap_year(unsigned yr) |
48 | { |
49 | if (yr <= 1752) |
50 | return !(yr % 4); |
51 | return (!(yr % 4) && (yr % 100)) || !(yr % 400); |
52 | } |
53 | |
54 | /* number of centuries since 1700, not inclusive */ |
55 | #define centuries_since_1700(yr) \ |
56 | ((yr) > 1700 ? (yr) / 100 - 17 : 0) |
57 | |
58 | /* number of centuries since 1700 whose modulo of 400 is 0 */ |
59 | #define quad_centuries_since_1700(yr) \ |
60 | ((yr) > 1600 ? ((yr) - 1600) / 400 : 0) |
61 | |
62 | /* number of leap years between year 1 and this year, not inclusive */ |
63 | #define leap_years_since_year_1(yr) \ |
64 | ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr)) |
65 | |
66 | static void center(char *, unsigned, unsigned); |
67 | static void day_array(unsigned, unsigned, unsigned *); |
68 | static void trim_trailing_spaces_and_print(char *); |
69 | |
70 | static void blank_string(char *buf, size_t buflen); |
71 | static char *build_row(char *p, unsigned *dp); |
72 | |
73 | #define DAY_LEN 3 /* 3 spaces per day */ |
74 | #define J_DAY_LEN (DAY_LEN + 1) |
75 | #define WEEK_LEN 20 /* 7 * 3 - one space at the end */ |
76 | #define J_WEEK_LEN (WEEK_LEN + 7) |
77 | #define HEAD_SEP 2 /* spaces between day headings */ |
78 | |
79 | int cal_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
80 | int cal_main(int argc, char **argv) |
81 | { |
82 | struct tm *local_time; |
83 | struct tm zero_tm; |
84 | time_t now; |
85 | unsigned month, year, flags, i; |
86 | char *month_names[12]; |
87 | char day_headings[28]; /* 28 for julian, 21 for nonjulian */ |
88 | char buf[40]; |
89 | |
90 | flags = getopt32(argv, "jy"); |
91 | /* This sets julian = flags & 1: */ |
92 | option_mask32 &= 1; |
93 | month = 0; |
94 | argv += optind; |
95 | argc -= optind; |
96 | |
97 | if (argc > 2) { |
98 | bb_show_usage(); |
99 | } |
100 | |
101 | if (!argc) { |
102 | time(&now); |
103 | local_time = localtime(&now); |
104 | year = local_time->tm_year + 1900; |
105 | if (!(flags & 2)) { /* no -y */ |
106 | month = local_time->tm_mon + 1; |
107 | } |
108 | } else { |
109 | if (argc == 2) { |
110 | month = xatou_range(*argv++, 1, 12); |
111 | } |
112 | year = xatou_range(*argv, 1, 9999); |
113 | } |
114 | |
115 | blank_string(day_headings, sizeof(day_headings) - 7 + 7*julian); |
116 | |
117 | i = 0; |
118 | do { |
119 | zero_tm.tm_mon = i; |
120 | strftime(buf, sizeof(buf), "%B", &zero_tm); |
121 | month_names[i] = xstrdup(buf); |
122 | |
123 | if (i < 7) { |
124 | zero_tm.tm_wday = i; |
125 | strftime(buf, sizeof(buf), "%a", &zero_tm); |
126 | strncpy(day_headings + i * (3+julian) + julian, buf, 2); |
127 | } |
128 | } while (++i < 12); |
129 | |
130 | if (month) { |
131 | unsigned row, len, days[MAXDAYS]; |
132 | unsigned *dp = days; |
133 | char lineout[30]; |
134 | |
135 | day_array(month, year, dp); |
136 | len = sprintf(lineout, "%s %d", month_names[month - 1], year); |
137 | printf("%*s%s\n%s\n", |
138 | ((7*julian + WEEK_LEN) - len) / 2, "", |
139 | lineout, day_headings); |
140 | for (row = 0; row < 6; row++) { |
141 | build_row(lineout, dp)[0] = '\0'; |
142 | dp += 7; |
143 | trim_trailing_spaces_and_print(lineout); |
144 | } |
145 | } else { |
146 | unsigned row, which_cal, week_len, days[12][MAXDAYS]; |
147 | unsigned *dp; |
148 | char lineout[80]; |
149 | |
150 | sprintf(lineout, "%d", year); |
151 | center(lineout, |
152 | (WEEK_LEN * 3 + HEAD_SEP * 2) |
153 | + julian * (J_WEEK_LEN * 2 + HEAD_SEP |
154 | - (WEEK_LEN * 3 + HEAD_SEP * 2)), |
155 | 0); |
156 | puts("\n"); /* two \n's */ |
157 | for (i = 0; i < 12; i++) { |
158 | day_array(i + 1, year, days[i]); |
159 | } |
160 | blank_string(lineout, sizeof(lineout)); |
161 | week_len = WEEK_LEN + julian * (J_WEEK_LEN - WEEK_LEN); |
162 | for (month = 0; month < 12; month += 3-julian) { |
163 | center(month_names[month], week_len, HEAD_SEP); |
164 | if (!julian) { |
165 | center(month_names[month + 1], week_len, HEAD_SEP); |
166 | } |
167 | center(month_names[month + 2 - julian], week_len, 0); |
168 | printf("\n%s%*s%s", day_headings, HEAD_SEP, "", day_headings); |
169 | if (!julian) { |
170 | printf("%*s%s", HEAD_SEP, "", day_headings); |
171 | } |
172 | bb_putchar('\n'); |
173 | for (row = 0; row < (6*7); row += 7) { |
174 | for (which_cal = 0; which_cal < 3-julian; which_cal++) { |
175 | dp = days[month + which_cal] + row; |
176 | build_row(lineout + which_cal * (week_len + 2), dp); |
177 | } |
178 | /* blank_string took care of nul termination. */ |
179 | trim_trailing_spaces_and_print(lineout); |
180 | } |
181 | } |
182 | } |
183 | |
184 | fflush_stdout_and_exit(EXIT_SUCCESS); |
185 | } |
186 | |
187 | /* |
188 | * day_array -- |
189 | * Fill in an array of 42 integers with a calendar. Assume for a moment |
190 | * that you took the (maximum) 6 rows in a calendar and stretched them |
191 | * out end to end. You would have 42 numbers or spaces. This routine |
192 | * builds that array for any month from Jan. 1 through Dec. 9999. |
193 | */ |
194 | static void day_array(unsigned month, unsigned year, unsigned *days) |
195 | { |
196 | unsigned long temp; |
197 | unsigned i; |
198 | unsigned day, dw, dm; |
199 | |
200 | memset(days, SPACE, MAXDAYS * sizeof(int)); |
201 | |
202 | if ((month == 9) && (year == 1752)) { |
203 | /* Assumes the Gregorian reformation eliminates |
204 | * 3 Sep. 1752 through 13 Sep. 1752. |
205 | */ |
206 | unsigned j_offset = julian * 244; |
207 | size_t oday = 0; |
208 | |
209 | do { |
210 | days[oday+2] = sep1752[oday] + j_offset; |
211 | } while (++oday < sizeof(sep1752)); |
212 | |
213 | return; |
214 | } |
215 | |
216 | /* day_in_year |
217 | * return the 1 based day number within the year |
218 | */ |
219 | day = 1; |
220 | if ((month > 2) && leap_year(year)) { |
221 | ++day; |
222 | } |
223 | |
224 | i = month; |
225 | while (i) { |
226 | day += days_in_month[--i]; |
227 | } |
228 | |
229 | /* day_in_week |
230 | * return the 0 based day number for any date from 1 Jan. 1 to |
231 | * 31 Dec. 9999. Assumes the Gregorian reformation eliminates |
232 | * 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all |
233 | * missing days. |
234 | */ |
235 | temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1) + day; |
236 | if (temp < FIRST_MISSING_DAY) { |
237 | dw = ((temp - 1 + SATURDAY) % 7); |
238 | } else { |
239 | dw = (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7); |
240 | } |
241 | |
242 | if (!julian) { |
243 | day = 1; |
244 | } |
245 | |
246 | dm = days_in_month[month]; |
247 | if ((month == 2) && leap_year(year)) { |
248 | ++dm; |
249 | } |
250 | |
251 | do { |
252 | days[dw++] = day++; |
253 | } while (--dm); |
254 | } |
255 | |
256 | static void trim_trailing_spaces_and_print(char *s) |
257 | { |
258 | char *p = s; |
259 | |
260 | while (*p) { |
261 | ++p; |
262 | } |
263 | while (p != s) { |
264 | --p; |
265 | if (!(isspace)(*p)) { /* We want the function... not the inline. */ |
266 | p[1] = '\0'; |
267 | break; |
268 | } |
269 | } |
270 | |
271 | puts(s); |
272 | } |
273 | |
274 | static void center(char *str, unsigned len, unsigned separate) |
275 | { |
276 | unsigned n = strlen(str); |
277 | len -= n; |
278 | printf("%*s%*s", (len/2) + n, str, (len/2) + (len % 2) + separate, ""); |
279 | } |
280 | |
281 | static void blank_string(char *buf, size_t buflen) |
282 | { |
283 | memset(buf, ' ', buflen); |
284 | buf[buflen-1] = '\0'; |
285 | } |
286 | |
287 | static char *build_row(char *p, unsigned *dp) |
288 | { |
289 | unsigned col, val, day; |
290 | |
291 | memset(p, ' ', (julian + DAY_LEN) * 7); |
292 | |
293 | col = 0; |
294 | do { |
295 | day = *dp++; |
296 | if (day != SPACE) { |
297 | if (julian) { |
298 | ++p; |
299 | if (day >= 100) { |
300 | *p = '0'; |
301 | p[-1] = (day / 100) + '0'; |
302 | day %= 100; |
303 | } |
304 | } |
305 | val = day / 10; |
306 | if (val > 0) { |
307 | *p = val + '0'; |
308 | } |
309 | *++p = day % 10 + '0'; |
310 | p += 2; |
311 | } else { |
312 | p += DAY_LEN + julian; |
313 | } |
314 | } while (++col < 7); |
315 | |
316 | return p; |
317 | } |
318 | |
319 | /* |
320 | * Copyright (c) 1989, 1993, 1994 |
321 | * The Regents of the University of California. All rights reserved. |
322 | * |
323 | * This code is derived from software contributed to Berkeley by |
324 | * Kim Letkeman. |
325 | * |
326 | * Redistribution and use in source and binary forms, with or without |
327 | * modification, are permitted provided that the following conditions |
328 | * are met: |
329 | * 1. Redistributions of source code must retain the above copyright |
330 | * notice, this list of conditions and the following disclaimer. |
331 | * 2. Redistributions in binary form must reproduce the above copyright |
332 | * notice, this list of conditions and the following disclaimer in the |
333 | * documentation and/or other materials provided with the distribution. |
334 | * 3. Neither the name of the University nor the names of its contributors |
335 | * may be used to endorse or promote products derived from this software |
336 | * without specific prior written permission. |
337 | * |
338 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
339 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
340 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
341 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
342 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
343 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
344 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
345 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
346 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
347 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
348 | * SUCH DAMAGE. |
349 | */ |