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[thirdparty/util-linux.git] / misc-utils / cal.c
1 /*
2 * Copyright (c) 1989, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * This code is derived from software contributed to Berkeley by
6 * Kim Letkeman.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 /* 1999-02-01 Jean-Francois Bignolles: added option '-m' to display
38 * monday as the first day of the week.
39 * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
40 * - added Native Language Support
41 *
42 * 2000-09-01 Michael Charles Pruznick <dummy@netwiz.net>
43 * Added "-3" option to print prev/next month with current.
44 * Added overridable default MONTHS_IN_ROW and "-1" option to
45 * get traditional output when -3 is the default. I hope that
46 * enough people will like -3 as the default that one day the
47 * product can be shipped that way.
48 *
49 * 2001-05-07 Pablo Saratxaga <pablo@mandrakesoft.com>
50 * Fixed the bugs with multi-byte charset (zg: cjk, utf-8)
51 * displaying. made the 'month year' ("%s %d") header translatable
52 * so it can be adapted to conventions used by different languages
53 * added support to read "first_weekday" locale information
54 * still to do: support for 'cal_direction' (will require a major
55 * rewrite of the displaying) and proper handling of RTL scripts
56 */
57
58 #include <sys/types.h>
59
60 #include <ctype.h>
61 #include <getopt.h>
62 #include <stdint.h>
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66 #include <time.h>
67 #include <unistd.h>
68 #include <errno.h>
69
70 #include "c.h"
71 #include "closestream.h"
72 #include "colors.h"
73 #include "nls.h"
74 #include "mbsalign.h"
75 #include "strutils.h"
76 #include "optutils.h"
77 #include "timeutils.h"
78 #include "ttyutils.h"
79 #include "xalloc.h"
80
81 #define DOY_MONTH_WIDTH 27 /* -j month width */
82 #define DOM_MONTH_WIDTH 20 /* month width */
83
84 enum {
85 CAL_COLOR_TODAY,
86 CAL_COLOR_HEADER,
87 CAL_COLOR_WEEKNUMBER,
88 CAL_COLOR_WEEKS,
89 CAL_COLOR_WORKDAY,
90 CAL_COLOR_WEEKEND
91 };
92
93 static const struct { const char * const scheme; const char * dflt; } colors[] =
94 {
95 [CAL_COLOR_TODAY] = { "today", UL_COLOR_REVERSE },
96 [CAL_COLOR_WEEKNUMBER] = { "weeknumber", UL_COLOR_REVERSE }, /* requested week */
97 [CAL_COLOR_WEEKS] = { "weeks", "" }, /* week numbers */
98 [CAL_COLOR_HEADER] = { "header", "" },
99 [CAL_COLOR_WORKDAY] = { "workday", "" },
100 [CAL_COLOR_WEEKEND] = { "weekend", "" }
101 };
102
103 static inline void cal_enable_color(int id)
104 {
105 color_scheme_enable(colors[id].scheme, colors[id].dflt);
106 }
107
108 static inline const char *cal_get_color_sequence(int id)
109 {
110 return color_scheme_get_sequence(colors[id].scheme, colors[id].dflt);
111 }
112
113 static inline void cal_disable_color(int id)
114 {
115 const char *seq = cal_get_color_sequence(id);
116 if (seq && seq[0])
117 color_disable();
118 }
119
120 static inline const char *cal_get_color_disable_sequence(int id)
121 {
122 const char *seq = cal_get_color_sequence(id);
123 if (seq && seq[0])
124 return UL_COLOR_RESET;
125 else
126 return "";
127 }
128
129 #include "widechar.h"
130
131 enum {
132 GREGORIAN = INT32_MIN,
133 ISO = INT32_MIN,
134 GB1752 = 1752,
135 DEFAULT_REFORM_YEAR = 1752,
136 JULIAN = INT32_MAX
137 };
138
139 enum {
140 SUNDAY = 0,
141 MONDAY,
142 TUESDAY,
143 WEDNESDAY,
144 THURSDAY,
145 FRIDAY,
146 SATURDAY,
147 DAYS_IN_WEEK,
148 NONEDAY
149 };
150
151 enum {
152 JANUARY = 1,
153 FEBRUARY,
154 MARCH,
155 APRIL,
156 MAY,
157 JUNE,
158 JULY,
159 AUGUST,
160 SEPTEMBER,
161 OCTOBER,
162 NOVEMBER,
163 DECEMBER
164 };
165
166 #define REFORMATION_MONTH SEPTEMBER
167 #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
168 #define YDAY_AFTER_MISSING 258 /* 14th in Sep 1752 */
169
170 #define MONTHS_IN_YEAR DECEMBER
171 #define DAYS_IN_MONTH 31
172 #define MAXDAYS 42 /* slots in a month array */
173 #define SPACE -1 /* used in day array */
174
175 #define SMALLEST_YEAR 1
176
177 #define DAY_LEN 3 /* 3 spaces per day */
178 #define WEEK_LEN (DAYS_IN_WEEK * DAY_LEN)
179 #define MONTHS_IN_YEAR_ROW 3 /* month columns in year view */
180 #define WNUM_LEN 3
181
182 #define FMT_ST_CHARS 300 /* 90 suffices in most locales */
183
184 static const int days_in_month[2][13] = {
185 {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
186 {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
187 };
188
189 enum {
190 WEEK_NUM_DISABLED = 0,
191 WEEK_NUM_MASK=0xff,
192 WEEK_NUM_ISO=0x100,
193 WEEK_NUM_US=0x200,
194 };
195
196 enum {
197 COLUMNS_MAX_THREE = -1,
198 COLUMNS_AUTO = -2,
199 };
200
201 /* utf-8 can have up to 6 bytes per char; and an extra byte for ending \0 */
202 static char day_headings[(WEEK_LEN + 1) * 6 + 1];
203
204 struct cal_request {
205 int day;
206 int month;
207 int32_t year;
208 int week;
209 int start_month;
210 };
211
212 struct cal_control {
213 const char *full_month[MONTHS_IN_YEAR]; /* month names */
214 const char *abbr_month[MONTHS_IN_YEAR]; /* abbreviated month names */
215 const char *weekdays[DAYS_IN_WEEK]; /* day names */
216
217 int reform_year; /* Gregorian reform year */
218 int colormode; /* day and week number highlight */
219 int num_months; /* number of requested months */
220 int span_months; /* span the date */
221 int months_in_row; /* number of months horizontally in print out */
222 int weekstart; /* day the week starts, often Sun or Mon */
223 int weektype; /* WEEK_TYPE_{NONE,ISO,US} */
224 size_t day_width; /* day width in characters in printout */
225 size_t week_width; /* 7 * day_width + possible week num */
226 size_t month_width; /* width of a month (vertical mode) */
227 int gutter_width; /* spaces in between horizontal month outputs */
228 struct cal_request req; /* the times user is interested */
229 bool julian, /* julian output */
230 header_year, /* print year number */
231 header_hint, /* does month name + year need two lines to fit */
232 vertical; /* display the output in vertical */
233 };
234
235 struct cal_month {
236 int days[MAXDAYS]; /* the day numbers, or SPACE */
237 int weeks[MAXDAYS / DAYS_IN_WEEK];
238 int month;
239 int32_t year;
240 struct cal_month *next;
241 };
242 /* function prototypes */
243 static int leap_year(const struct cal_control *ctl, int32_t year);
244 static int monthname_to_number(struct cal_control *ctl, const char *name);
245 static void weekdays_init(struct cal_control *ctl);
246 static void headers_init(struct cal_control *ctl);
247 static void cal_fill_month(struct cal_month *month, const struct cal_control *ctl);
248 static void cal_output_header(struct cal_month *month, const struct cal_control *ctl);
249 static void cal_output_months(struct cal_month *month, const struct cal_control *ctl);
250 static void cal_vert_output_months(struct cal_month *month, const struct cal_control *ctl);
251 static void monthly(const struct cal_control *ctl);
252 static void yearly(const struct cal_control *ctl);
253 static int day_in_year(const struct cal_control *ctl, int day,
254 int month, int32_t year);
255 static int day_in_week(const struct cal_control *ctl, int day,
256 int month, int32_t year);
257 static int week_number(int day, int month, int32_t year, const struct cal_control *ctl);
258 static int week_to_day(const struct cal_control *ctl);
259 static int center_str(const char *src, char *dest, size_t dest_size, size_t width);
260 static void center(const char *str, size_t len, int separate);
261 static int left_str(const char *src, char *dest, size_t dest_size, size_t width);
262 static void left(const char *str, size_t len, int separate);
263 static int parse_reform_year(const char *reform_year);
264 static void __attribute__((__noreturn__)) usage(void);
265
266 #ifdef TEST_CAL
267 static time_t cal_time(time_t *t)
268 {
269 char *str = getenv("CAL_TEST_TIME");
270
271 if (str) {
272 uint64_t x = strtou64_or_err(str, "failed to parse CAL_TEST_TIME");
273
274 *t = x;
275 return *t;
276 }
277
278 return time(t);
279 }
280 #else
281 # define cal_time(t) time(t)
282 #endif
283
284 int main(int argc, char **argv)
285 {
286 struct tm local_time;
287 time_t now;
288 int ch = 0, yflag = 0, Yflag = 0, cols = COLUMNS_MAX_THREE;
289
290 static struct cal_control ctl = {
291 .reform_year = DEFAULT_REFORM_YEAR,
292 .weekstart = SUNDAY,
293 .span_months = 0,
294 .colormode = UL_COLORMODE_UNDEF,
295 .weektype = WEEK_NUM_DISABLED,
296 .day_width = DAY_LEN,
297 .gutter_width = 2,
298 .req.day = 0,
299 .req.month = 0
300 };
301
302 enum {
303 OPT_COLOR = CHAR_MAX + 1,
304 OPT_ISO,
305 OPT_REFORM
306 };
307
308 static const struct option longopts[] = {
309 {"one", no_argument, NULL, '1'},
310 {"three", no_argument, NULL, '3'},
311 {"sunday", no_argument, NULL, 's'},
312 {"monday", no_argument, NULL, 'm'},
313 {"julian", no_argument, NULL, 'j'},
314 {"months", required_argument, NULL, 'n'},
315 {"span", no_argument, NULL, 'S'},
316 {"year", no_argument, NULL, 'y'},
317 {"week", optional_argument, NULL, 'w'},
318 {"color", optional_argument, NULL, OPT_COLOR},
319 {"reform", required_argument, NULL, OPT_REFORM},
320 {"iso", no_argument, NULL, OPT_ISO},
321 {"version", no_argument, NULL, 'V'},
322 {"twelve", no_argument, NULL, 'Y'},
323 {"help", no_argument, NULL, 'h'},
324 {"vertical", no_argument, NULL,'v'},
325 {"columns", required_argument, NULL,'c'},
326 {NULL, 0, NULL, 0}
327 };
328
329 static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
330 { 'Y','n','y' },
331 { 0 }
332 };
333 int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
334
335 setlocale(LC_ALL, "");
336 bindtextdomain(PACKAGE, LOCALEDIR);
337 textdomain(PACKAGE);
338 close_stdout_atexit();
339
340 /*
341 * The traditional Unix cal utility starts the week at Sunday,
342 * while ISO 8601 starts at Monday. We read the start day from
343 * the locale database, which can be overridden with the
344 * -s (Sunday) or -m (Monday) options.
345 */
346 #if HAVE_DECL__NL_TIME_WEEK_1STDAY
347 /*
348 * You need to use 2 locale variables to get the first day of the week.
349 * This is needed to support first_weekday=2 and first_workday=1 for
350 * the rare case where working days span across 2 weeks.
351 * This shell script shows the combinations and calculations involved:
352 *
353 * for LANG in en_US ru_RU fr_FR csb_PL POSIX; do
354 * printf "%s:\t%s + %s -1 = " $LANG $(locale week-1stday first_weekday)
355 * date -d"$(locale week-1stday) +$(($(locale first_weekday)-1))day" +%w
356 * done
357 *
358 * en_US: 19971130 + 1 -1 = 0 #0 = sunday
359 * ru_RU: 19971130 + 2 -1 = 1
360 * fr_FR: 19971201 + 1 -1 = 1
361 * csb_PL: 19971201 + 2 -1 = 2
362 * POSIX: 19971201 + 7 -1 = 0
363 */
364 {
365 unsigned int wfd;
366 union { unsigned int word; char *string; } val;
367 val.string = nl_langinfo(_NL_TIME_WEEK_1STDAY);
368
369 wfd = val.word;
370 wfd = day_in_week(&ctl, wfd % 100, (wfd / 100) % 100,
371 wfd / (100 * 100));
372 ctl.weekstart = (wfd + *nl_langinfo(_NL_TIME_FIRST_WEEKDAY) - 1) % DAYS_IN_WEEK;
373 }
374 #endif
375 while ((ch = getopt_long(argc, argv, "13mjn:sSywYvc:Vh", longopts, NULL)) != -1) {
376
377 err_exclusive_options(ch, longopts, excl, excl_st);
378
379 switch(ch) {
380 case '1':
381 ctl.num_months = 1;
382 break;
383 case '3':
384 ctl.num_months = 3;
385 ctl.span_months = 1;
386 break;
387 case 's':
388 ctl.weekstart = SUNDAY; /* default */
389 break;
390 case 'm':
391 ctl.weekstart = MONDAY;
392 break;
393 case 'j':
394 ctl.julian = 1;
395 ctl.day_width = DAY_LEN + 1;
396 break;
397 case 'y':
398 yflag = 1;
399 break;
400 case 'Y':
401 Yflag = 1;
402 break;
403 case 'n':
404 ctl.num_months = strtou32_or_err(optarg,
405 _("invalid month argument"));
406 break;
407 case 'S':
408 ctl.span_months = 1;
409 break;
410 case 'w':
411 if (optarg) {
412 if (*optarg == '=')
413 optarg++;
414 ctl.req.week = strtos32_or_err(optarg,
415 _("invalid week argument"));
416 if (ctl.req.week < 1 || 54 < ctl.req.week)
417 errx(EXIT_FAILURE,_("illegal week value: use 1-54"));
418 }
419 ctl.weektype = WEEK_NUM_US; /* default per weekstart */
420 break;
421 case OPT_COLOR:
422 ctl.colormode = UL_COLORMODE_AUTO;
423 if (optarg)
424 ctl.colormode = colormode_or_err(optarg);
425 break;
426 case OPT_REFORM:
427 ctl.reform_year = parse_reform_year(optarg);
428 break;
429 case OPT_ISO:
430 ctl.reform_year = ISO;
431 break;
432 case 'v':
433 ctl.vertical = 1;
434 break;
435 case 'c':
436 if (strcmp(optarg, "auto") == 0)
437 cols = COLUMNS_AUTO;
438 else
439 cols = strtosize_or_err(optarg,
440 _("failed to parse columns"));
441 break;
442 case 'V':
443 print_version(EXIT_SUCCESS);
444 case 'h':
445 usage();
446 default:
447 errtryhelp(EXIT_FAILURE);
448 }
449 }
450
451 argc -= optind;
452 argv += optind;
453
454 if (ctl.weektype) {
455 ctl.weektype = ctl.req.week & WEEK_NUM_MASK;
456 ctl.weektype |= (ctl.weekstart == MONDAY ? WEEK_NUM_ISO : WEEK_NUM_US);
457 ctl.week_width = (ctl.day_width * DAYS_IN_WEEK) + WNUM_LEN;
458 } else
459 ctl.week_width = ctl.day_width * DAYS_IN_WEEK;
460 /*
461 * The day_width includes the space between days,
462 * as there is no leading space, remove 1
463 * */
464 ctl.week_width -= 1;
465
466 if (argc == 1 && !isdigit_string(*argv)) {
467 usec_t x;
468 /* cal <timestamp> */
469 if (ul_parse_timestamp(*argv, &x) == 0)
470 now = (time_t) (x / 1000000);
471 /* cal <monthname> */
472 else if ((ctl.req.month = monthname_to_number(&ctl, *argv)) > 0)
473 cal_time(&now); /* this year */
474 else
475 errx(EXIT_FAILURE, _("failed to parse timestamp or unknown month name: %s"), *argv);
476 argc = 0;
477 } else
478 cal_time(&now);
479
480 localtime_r(&now, &local_time);
481
482 switch(argc) {
483 case 3:
484 ctl.req.day = strtos32_or_err(*argv++, _("illegal day value"));
485 if (ctl.req.day < 1 || DAYS_IN_MONTH < ctl.req.day)
486 errx(EXIT_FAILURE, _("illegal day value: use 1-%d"), DAYS_IN_MONTH);
487 FALLTHROUGH;
488 case 2:
489 if (isdigit(**argv))
490 ctl.req.month = strtos32_or_err(*argv++, _("illegal month value: use 1-12"));
491 else {
492 ctl.req.month = monthname_to_number(&ctl, *argv);
493 if (ctl.req.month < 0)
494 errx(EXIT_FAILURE, _("unknown month name: %s"), *argv);
495 argv++;
496 }
497 if (ctl.req.month < 1 || MONTHS_IN_YEAR < ctl.req.month)
498 errx(EXIT_FAILURE, _("illegal month value: use 1-12"));
499 FALLTHROUGH;
500 case 1:
501 ctl.req.year = strtos32_or_err(*argv++, _("illegal year value"));
502 if (ctl.req.year < SMALLEST_YEAR)
503 errx(EXIT_FAILURE, _("illegal year value: use positive integer"));
504 if (ctl.req.year == JULIAN)
505 errx(EXIT_FAILURE, _("illegal year value"));
506 if (ctl.req.day) {
507 int dm = days_in_month[leap_year(&ctl, ctl.req.year)]
508 [ctl.req.month];
509 if (ctl.req.day > dm)
510 errx(EXIT_FAILURE, _("illegal day value: use 1-%d"), dm);
511 ctl.req.day = day_in_year(&ctl, ctl.req.day,
512 ctl.req.month, ctl.req.year);
513 } else if ((int32_t) (local_time.tm_year + 1900) == ctl.req.year) {
514 ctl.req.day = local_time.tm_yday + 1;
515 }
516 if (!ctl.req.month && !ctl.req.week) {
517 ctl.req.month = local_time.tm_mon + 1;
518 if (!ctl.num_months)
519 yflag = 1;
520 }
521 break;
522 case 0:
523 if (!ctl.req.week) {
524 ctl.req.day = local_time.tm_yday + 1;
525 if (!ctl.req.month)
526 ctl.req.month = local_time.tm_mon + 1;
527 }
528 ctl.req.year = local_time.tm_year + 1900;
529
530 break;
531 default:
532 warnx(_("bad usage"));
533 errtryhelp(EXIT_FAILURE);
534 }
535
536 if (0 < ctl.req.week) {
537 int yday = week_to_day(&ctl);
538 int leap = leap_year(&ctl, ctl.req.year);
539 int m = 1;
540
541 if (yday < 1)
542 errx(EXIT_FAILURE, _("illegal week value: year %d "
543 "doesn't have week %d"),
544 ctl.req.year, ctl.req.week);
545 while (m <= DECEMBER && yday > days_in_month[leap][m])
546 yday -= days_in_month[leap][m++];
547 if (DECEMBER < m && ctl.weektype & WEEK_NUM_ISO) {
548 /* In some years (e.g. 2010 in ISO mode) it's possible
549 * to have a remnant of week 53 starting the year yet
550 * the year in question ends during 52, in this case
551 * we're assuming that early remnant is being referred
552 * to if 53 is given as argument. */
553 if (ctl.req.week != week_number(31, DECEMBER, ctl.req.year - 1, &ctl))
554 errx(EXIT_FAILURE,
555 _("illegal week value: year %d "
556 "doesn't have week %d"),
557 ctl.req.year, ctl.req.week);
558 }
559 if (!ctl.req.month)
560 ctl.req.month = MONTHS_IN_YEAR < m ? 1 : m;
561 }
562
563 weekdays_init(&ctl);
564 headers_init(&ctl);
565
566 if (colors_init(ctl.colormode, "cal") == 0) {
567 /* disable */
568 ctl.req.day = 0;
569 ctl.weektype &= ~WEEK_NUM_MASK;
570 }
571
572 if (yflag || Yflag) {
573 ctl.gutter_width = 3;
574 if (!ctl.num_months)
575 ctl.num_months = MONTHS_IN_YEAR;
576 if (yflag) {
577 ctl.req.start_month = 1; /* start from Jan */
578 ctl.header_year = 1; /* print year number */
579 }
580 }
581
582 if (ctl.vertical)
583 ctl.gutter_width = 1;
584
585 if (ctl.num_months > 1 && ctl.months_in_row == 0) {
586 ctl.months_in_row = MONTHS_IN_YEAR_ROW; /* default */
587
588 if (cols > 0)
589 ctl.months_in_row = cols;
590 else if (isatty(STDOUT_FILENO)) {
591 int w, mw, extra, new_n;
592
593 w = get_terminal_width(80);
594 mw = ctl.julian ? DOY_MONTH_WIDTH : DOM_MONTH_WIDTH;
595
596 if (w < mw)
597 w = mw;
598
599 extra = ((w / mw) - 1) * ctl.gutter_width;
600 new_n = (w - extra) / mw;
601
602 switch (cols) {
603 case COLUMNS_MAX_THREE:
604 if (new_n < MONTHS_IN_YEAR_ROW)
605 ctl.months_in_row = new_n > 0 ? new_n : 1;
606 break;
607 case COLUMNS_AUTO:
608 ctl.months_in_row = new_n > 0 ? new_n : 1;
609 break;
610 }
611 }
612 } else if (!ctl.months_in_row)
613 ctl.months_in_row = 1;
614
615 if (!ctl.num_months)
616 ctl.num_months = 1; /* display at least one month */
617
618 if (yflag || Yflag)
619 yearly(&ctl);
620 else
621 monthly(&ctl);
622
623 return EXIT_SUCCESS;
624 }
625
626 /* leap year -- account for gregorian reformation in 1752 */
627 static int leap_year(const struct cal_control *ctl, int32_t year)
628 {
629 if (year <= ctl->reform_year)
630 return !(year % 4);
631
632 return ( !(year % 4) && (year % 100) ) || !(year % 400);
633 }
634
635 static void init_monthnames(struct cal_control *ctl)
636 {
637 size_t i;
638
639 if (ctl->full_month[0] != NULL)
640 return; /* already initialized */
641
642 for (i = 0; i < MONTHS_IN_YEAR; i++)
643 ctl->full_month[i] = nl_langinfo(ALTMON_1 + i);
644 }
645
646 static void init_abbr_monthnames(struct cal_control *ctl)
647 {
648 size_t i;
649
650 if (ctl->abbr_month[0] != NULL)
651 return; /* already initialized */
652
653 for (i = 0; i < MONTHS_IN_YEAR; i++)
654 ctl->abbr_month[i] = nl_langinfo(_NL_ABALTMON_1 + i);
655 }
656
657 static int monthname_to_number(struct cal_control *ctl, const char *name)
658 {
659 size_t i;
660
661 init_monthnames(ctl);
662 for (i = 0; i < MONTHS_IN_YEAR; i++)
663 if (strcasecmp(ctl->full_month[i], name) == 0)
664 return i + 1;
665
666 init_abbr_monthnames(ctl);
667 for (i = 0; i < MONTHS_IN_YEAR; i++)
668 if (strcasecmp(ctl->abbr_month[i], name) == 0)
669 return i + 1;
670
671 return -EINVAL;
672 }
673
674 static void weekdays_init(struct cal_control *ctl)
675 {
676 size_t wd;
677 int i;
678
679 for (i = 0; i < DAYS_IN_WEEK; i++) {
680 wd = (i + ctl->weekstart) % DAYS_IN_WEEK;
681 ctl->weekdays[i] = nl_langinfo(ABDAY_1 + wd);
682 }
683 }
684 static void headers_init(struct cal_control *ctl)
685 {
686 size_t i;
687 char *cur_dh = day_headings;
688 char tmp[FMT_ST_CHARS];
689 int year_len;
690
691 year_len = snprintf(tmp, sizeof(tmp), "%04d", ctl->req.year);
692
693 if (year_len < 0 || (size_t)year_len >= sizeof(tmp)) {
694 /* XXX impossible error */
695 return;
696 }
697
698 for (i = 0; i < DAYS_IN_WEEK; i++) {
699 size_t space_left;
700
701 space_left = sizeof(day_headings) - (cur_dh - day_headings);
702 if (i && space_left)
703 strncat(cur_dh++, " ", space_left--);
704
705 if (space_left <= (ctl->day_width - 1))
706 break;
707 cur_dh += center_str(ctl->weekdays[i], cur_dh,
708 space_left, ctl->day_width - 1);
709 }
710
711 init_monthnames(ctl);
712
713 for (i = 0; i < MONTHS_IN_YEAR; i++) {
714 /* The +1 after year_len is space in between month and year. */
715 if (ctl->week_width < strlen(ctl->full_month[i]) + year_len)
716 ctl->header_hint = 1;
717 }
718 }
719
720 static void cal_fill_month(struct cal_month *month, const struct cal_control *ctl)
721 {
722 int first_week_day = day_in_week(ctl, 1, month->month, month->year);
723 int month_days;
724 int i, j, weeklines = 0;
725
726 if (ctl->julian)
727 j = day_in_year(ctl, 1, month->month, month->year);
728 else
729 j = 1;
730 month_days = j + days_in_month[leap_year(ctl, month->year)][month->month];
731
732 /* True when Sunday is not first day in the output week. */
733 if (ctl->weekstart) {
734 first_week_day -= ctl->weekstart;
735 if (first_week_day < 0)
736 first_week_day = DAYS_IN_WEEK - ctl->weekstart;
737 month_days += ctl->weekstart - 1;
738 }
739
740 /* Fill day array. */
741 for (i = 0; i < MAXDAYS; i++) {
742 if (0 < first_week_day) {
743 month->days[i] = SPACE;
744 first_week_day--;
745 continue;
746 }
747 if (j < month_days) {
748 if (month->year == ctl->reform_year &&
749 month->month == REFORMATION_MONTH &&
750 (j == 3 || j == 247))
751 j += NUMBER_MISSING_DAYS;
752 month->days[i] = j;
753 j++;
754 continue;
755 }
756 month->days[i] = SPACE;
757 weeklines++;
758 }
759
760 /* Add week numbers */
761 if (ctl->weektype) {
762 int weeknum = week_number(1, month->month, month->year, ctl);
763 weeklines = MAXDAYS / DAYS_IN_WEEK - weeklines / DAYS_IN_WEEK;
764 for (i = 0; i < MAXDAYS / DAYS_IN_WEEK; i++) {
765 if (0 < weeklines) {
766 if (52 < weeknum)
767 weeknum = week_number(month->days[i * DAYS_IN_WEEK], month->month, month->year, ctl);
768 month->weeks[i] = weeknum++;
769 } else
770 month->weeks[i] = SPACE;
771 weeklines--;
772 }
773 }
774 }
775
776 static void cal_output_header(struct cal_month *month, const struct cal_control *ctl)
777 {
778 char out[FMT_ST_CHARS];
779 struct cal_month *i;
780
781 cal_enable_color(CAL_COLOR_HEADER);
782
783 if (ctl->header_hint || ctl->header_year) {
784 for (i = month; i; i = i->next) {
785 snprintf(out, sizeof(out), "%s", ctl->full_month[i->month - 1]);
786 center(out, ctl->week_width, i->next == NULL ? 0 : ctl->gutter_width);
787 }
788 if (!ctl->header_year) {
789 fputc('\n', stdout);
790 for (i = month; i; i = i->next) {
791 snprintf(out, sizeof(out), "%04d", i->year);
792 center(out, ctl->week_width, i->next == NULL ? 0 : ctl->gutter_width);
793 }
794 }
795 } else {
796 for (i = month; i; i = i->next) {
797 snprintf(out, sizeof(out), "%s %04d", ctl->full_month[i->month - 1], i->year);
798 center(out, ctl->week_width, i->next == NULL ? 0 : ctl->gutter_width);
799 }
800 }
801 fputc('\n', stdout);
802 for (i = month; i; i = i->next) {
803 if (ctl->weektype) {
804 if (ctl->julian)
805 printf("%*s%s", (int)ctl->day_width - 1, "", day_headings);
806 else
807 printf("%*s%s", (int)ctl->day_width, "", day_headings);
808 } else
809 fputs(day_headings, stdout);
810 if (i->next != NULL)
811 printf("%*s", ctl->gutter_width, "");
812 }
813 cal_disable_color(CAL_COLOR_HEADER);
814 fputc('\n', stdout);
815 }
816
817 static void cal_vert_output_header(struct cal_month *month,
818 const struct cal_control *ctl)
819 {
820 char out[FMT_ST_CHARS];
821 struct cal_month *m;
822 int month_width;
823
824 cal_enable_color(CAL_COLOR_HEADER);
825
826 month_width = ctl->day_width * (MAXDAYS / DAYS_IN_WEEK);
827
828 /* Padding for the weekdays */
829 printf("%*s", (int)ctl->day_width + 1, "");
830
831 if (ctl->header_hint || ctl->header_year) {
832 for (m = month; m; m = m->next) {
833 snprintf(out, sizeof(out), "%s", ctl->full_month[m->month - 1]);
834 left(out, month_width, ctl->gutter_width);
835 }
836 if (!ctl->header_year) {
837 fputc('\n', stdout);
838 /* Padding for the weekdays */
839 printf("%*s", (int)ctl->day_width + 1, "");
840
841 for (m = month; m; m = m->next) {
842 snprintf(out, sizeof(out), "%04d", m->year);
843 left(out, month_width, ctl->gutter_width);
844 }
845 }
846 } else {
847 for (m = month; m; m = m->next) {
848 snprintf(out, sizeof(out), "%s %04d", ctl->full_month[m->month - 1], m->year);
849 left(out, month_width, ctl->gutter_width);
850 }
851 }
852
853 cal_disable_color(CAL_COLOR_HEADER);
854 fputc('\n', stdout);
855 }
856
857 #define fput_seq(_s) do { if ((_s) && *(_s)) fputs((_s), stdout); } while(0)
858
859 static void cal_output_months(struct cal_month *month, const struct cal_control *ctl)
860 {
861 int reqday, week_line, d;
862 int skip;
863 struct cal_month *i;
864 int firstwork = ctl->weekstart == SUNDAY ? 1 : 0; /* first workday in week */
865
866 /* Let's keep sequence cached rather than search it for each day */
867 const char *seq_wo_start = cal_get_color_sequence(CAL_COLOR_WORKDAY);
868 const char *seq_wo_end = cal_get_color_disable_sequence(CAL_COLOR_WORKDAY);
869 const char *seq_we_start = cal_get_color_sequence(CAL_COLOR_WEEKEND);
870 const char *seq_we_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKEND);
871
872 const char *seq_ws_start = NULL, *seq_ws_end = NULL;
873
874 if (ctl->weektype) {
875 seq_ws_start = cal_get_color_sequence(CAL_COLOR_WEEKS);
876 seq_ws_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKS);
877 }
878
879 for (week_line = 0; week_line < MAXDAYS / DAYS_IN_WEEK; week_line++) {
880 for (i = month; i; i = i->next) {
881 /* Determine the day that should be highlighted. */
882 reqday = 0;
883 if (i->month == ctl->req.month && i->year == ctl->req.year) {
884 if (ctl->julian)
885 reqday = ctl->req.day;
886 else
887 reqday = ctl->req.day + 1 -
888 day_in_year(ctl, 1, i->month,
889 i->year);
890 }
891
892 if (ctl->weektype) {
893 if (0 < i->weeks[week_line]) {
894 const char *seq_start, *seq_end;
895
896 /* colorize by requested week-number or generic weeks color */
897 if (ctl->req.week &&
898 ctl->req.week == i->weeks[week_line]) {
899 seq_start = cal_get_color_sequence(CAL_COLOR_WEEKNUMBER);
900 seq_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKNUMBER);
901 } else {
902 seq_start = seq_ws_start;
903 seq_end = seq_ws_end;
904 }
905
906 if (seq_start && *seq_start)
907 printf("%s%2d%s", seq_start,
908 i->weeks[week_line], seq_end);
909 else
910 printf("%2d", i->weeks[week_line]);
911 } else
912 printf("%2s", "");
913 skip = ctl->day_width;
914 } else
915 /* First day of the week is one char narrower than the other days,
916 * unless week number is printed. */
917 skip = ctl->day_width - 1;
918
919 for (d = DAYS_IN_WEEK * week_line;
920 d < DAYS_IN_WEEK * week_line + DAYS_IN_WEEK; d++) {
921
922 int workday = d >= DAYS_IN_WEEK * week_line + firstwork &&
923 d <= DAYS_IN_WEEK * week_line + firstwork + 4;
924
925 if (0 < i->days[d]) {
926 fput_seq(workday ? seq_wo_start : seq_we_start);
927
928 if (reqday == i->days[d])
929 printf("%*s%s%*d%s",
930 skip - (ctl->julian ? 3 : 2),
931 "", cal_get_color_sequence(CAL_COLOR_TODAY), (ctl->julian ? 3 : 2),
932 i->days[d], cal_get_color_disable_sequence(CAL_COLOR_TODAY));
933 else
934 printf("%*d", skip, i->days[d]);
935
936 fput_seq(workday ? seq_wo_end : seq_we_end);
937 } else
938 printf("%*s", skip, "");
939
940 if (skip < (int)ctl->day_width)
941 skip++;
942 }
943 if (i->next != NULL)
944 printf("%*s", ctl->gutter_width, "");
945 }
946 if (i == NULL)
947 fputc('\n', stdout);
948 }
949 }
950
951 static void
952 cal_vert_output_months(struct cal_month *month, const struct cal_control *ctl)
953 {
954 int i, reqday, week, d;
955 int skip;
956 struct cal_month *m;
957 int firstwork = ctl->weekstart == SUNDAY ? 1 : 0; /* first workday in week */
958
959 const char *seq_wo_start = cal_get_color_sequence(CAL_COLOR_WORKDAY);
960 const char *seq_wo_end = cal_get_color_disable_sequence(CAL_COLOR_WORKDAY);
961 const char *seq_we_start = cal_get_color_sequence(CAL_COLOR_WEEKEND);
962 const char *seq_we_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKEND);
963 const char *seq_hd_start = cal_get_color_sequence(CAL_COLOR_HEADER);
964 const char *seq_hd_end = cal_get_color_disable_sequence(CAL_COLOR_HEADER);
965
966 skip = ctl->day_width;
967 for (i = 0; i < DAYS_IN_WEEK; i++) {
968 const char *seq_start = seq_wo_start,
969 *seq_end = seq_wo_end;
970
971 /* Day name */
972 fput_seq(seq_hd_start);
973 left(ctl->weekdays[i], ctl->day_width - 1, 0);
974 fput_seq(seq_hd_end);
975
976 /* Workday/Weekend color */
977 if (i < firstwork || i > firstwork + 4) {
978 seq_start = seq_we_start;
979 seq_end = seq_we_end;
980 }
981
982 /* Day digits */
983 for (m = month; m; m = m->next) {
984 reqday = 0;
985 if (m->month == ctl->req.month && m->year == ctl->req.year) {
986 if (ctl->julian) {
987 reqday = ctl->req.day;
988 } else {
989 reqday = ctl->req.day + 1 -
990 day_in_year(ctl, 1, m->month, m->year);
991 }
992 }
993 for (week = 0; week < MAXDAYS / DAYS_IN_WEEK; week++) {
994 d = i + DAYS_IN_WEEK * week;
995
996 if (0 < m->days[d]) {
997 fput_seq(seq_start);
998 if (reqday == m->days[d]) {
999 printf("%*s%s%*d%s",
1000 skip - (ctl->julian ? 3 : 2),
1001 "",
1002 cal_get_color_sequence(CAL_COLOR_TODAY),
1003 (ctl->julian ? 3 : 2),
1004 m->days[d],
1005 cal_get_color_disable_sequence(CAL_COLOR_TODAY));
1006 } else {
1007 printf("%*d", skip, m->days[d]);
1008 }
1009 fput_seq(seq_end);
1010 } else {
1011 printf("%*s", skip, "");
1012 }
1013 skip = ctl->day_width;
1014 }
1015 if (m->next != NULL)
1016 printf("%*s", ctl->gutter_width, "");
1017 }
1018 fputc('\n', stdout);
1019 }
1020 if (!ctl->weektype)
1021 return;
1022
1023 /* Week numbers */
1024 const char *seq_ws_start = cal_get_color_sequence(CAL_COLOR_WEEKS);
1025 const char *seq_ws_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKS);
1026
1027 printf("%*s", (int)ctl->day_width - 1, "");
1028 for (m = month; m; m = m->next) {
1029 for (week = 0; week < MAXDAYS / DAYS_IN_WEEK; week++) {
1030 if (0 < m->weeks[week]) {
1031 const char *seq_start = NULL, *seq_end = NULL;
1032
1033 /* colorize by requested week-number or generic weeks color */
1034 if (ctl->req.week &&
1035 ctl->req.week == m->weeks[week]) {
1036 seq_start = cal_get_color_sequence(CAL_COLOR_WEEKNUMBER);
1037 seq_end = cal_get_color_disable_sequence(CAL_COLOR_WEEKNUMBER);
1038 } else {
1039 seq_start = seq_ws_start;
1040 seq_end = seq_ws_end;
1041 }
1042
1043 if (seq_start && *seq_start)
1044 printf("%*s%s%*d%s",
1045 skip - (ctl->julian ? 3 : 2), "",
1046 seq_start,
1047 (ctl->julian ? 3 : 2), m->weeks[week],
1048 seq_end);
1049 else
1050 printf("%*d", skip, m->weeks[week]);
1051 } else
1052 printf("%*s", skip, "");
1053 }
1054 if (m->next != NULL)
1055 printf("%*s", ctl->gutter_width, "");
1056 }
1057 fputc('\n', stdout);
1058 }
1059
1060
1061 static void monthly(const struct cal_control *ctl)
1062 {
1063 struct cal_month *m, *ms;
1064 int i, rows, month = ctl->req.start_month ? ctl->req.start_month : ctl->req.month;
1065 int32_t year = ctl->req.year;
1066
1067 /* cal -3, cal -Y --span, etc. */
1068 if (ctl->span_months) {
1069 int new_month = month - ctl->num_months / 2;
1070 if (new_month < 1) {
1071 new_month *= -1;
1072 year -= (new_month / MONTHS_IN_YEAR) + 1;
1073
1074 if (new_month > MONTHS_IN_YEAR)
1075 new_month %= MONTHS_IN_YEAR;
1076 month = MONTHS_IN_YEAR - new_month;
1077 } else
1078 month = new_month;
1079 }
1080
1081 ms = xcalloc(ctl->months_in_row, sizeof(*ms));
1082
1083 for (i = 0; i < ctl->months_in_row - 1; i++)
1084 ms[i].next = &ms[i + 1];
1085
1086 rows = (ctl->num_months - 1) / ctl->months_in_row;
1087 for (i = 0; i < rows + 1 ; i++){
1088 if (i == rows && ctl->num_months % ctl->months_in_row > 0)
1089 for (int n = (ctl->num_months % ctl->months_in_row) - 1; n < ctl->months_in_row; n++)
1090 ms[n].next = NULL;
1091
1092 for (m = ms; m; m = m->next){
1093 m->month = month++;
1094 m->year = year;
1095 if (MONTHS_IN_YEAR < month) {
1096 year++;
1097 month = 1;
1098 }
1099 cal_fill_month(m, ctl);
1100 }
1101 if (ctl->vertical) {
1102 if (i > 0)
1103 fputc('\n', stdout); /* Add a line between row */
1104
1105 cal_vert_output_header(ms, ctl);
1106 cal_vert_output_months(ms, ctl);
1107 } else {
1108 cal_output_header(ms, ctl);
1109 cal_output_months(ms, ctl);
1110 }
1111 }
1112 free(ms);
1113 }
1114
1115 static void yearly(const struct cal_control *ctl)
1116 {
1117 size_t year_width;
1118
1119 year_width = (size_t) ctl->months_in_row * ctl->week_width
1120 + ((size_t) ctl->months_in_row - 1) * ctl->gutter_width;
1121
1122 if (ctl->header_year) {
1123 char out[FMT_ST_CHARS];
1124
1125 snprintf(out, sizeof(out), "%04d", ctl->req.year);
1126 center(out, year_width, 0);
1127 fputs("\n\n", stdout);
1128 }
1129 monthly(ctl);
1130 }
1131
1132 /*
1133 * day_in_year --
1134 * return the 1 based day number within the year
1135 */
1136 static int day_in_year(const struct cal_control *ctl,
1137 int day, int month, int32_t year)
1138 {
1139 int i, leap;
1140
1141 leap = leap_year(ctl, year);
1142 for (i = 1; i < month; i++)
1143 day += days_in_month[leap][i];
1144 return day;
1145 }
1146
1147 /*
1148 * day_in_week
1149 * return the 0 based day number for any date from 1 Jan. 1 to
1150 * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
1151 * 3 Sep. 1752 through 13 Sep. 1752, and returns invalid weekday
1152 * during the period of 11 days.
1153 */
1154 static int day_in_week(const struct cal_control *ctl, int day,
1155 int month, int32_t year)
1156 {
1157 /*
1158 * The magic constants in the reform[] array are, in a simplified
1159 * sense, the remaining days after slicing into one week periods the total
1160 * days from the beginning of the year to the target month. That is,
1161 * weeks + reform[] days gets us to the target month. The exception is,
1162 * that for the months past February 'DOY - 1' must be used.
1163 *
1164 * DoY (Day of Year): total days to the target month
1165 *
1166 * Month 1 2 3 4 5 6 7 8 9 10 11 12
1167 * DoY 0 31 59 90 120 151 181 212 243 273 304 334
1168 * DoY % 7 0 3
1169 * DoY - 1 % 7 - -- 2 5 0 3 5 1 4 6 2 4
1170 * reform[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
1171 *
1172 * Note: these calculations are for non leap years.
1173 */
1174 static const int reform[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
1175 static const int old[] = { 5, 1, 0, 3, 5, 1, 3, 6, 2, 4, 0, 2 };
1176
1177 if (month > 0 && month - 1 >= (int) ARRAY_SIZE(old))
1178 month = ARRAY_SIZE(old); /* for sure */
1179
1180 if (year != ctl->reform_year + 1)
1181 year -= month < MARCH;
1182 else
1183 year -= (month < MARCH) + 14;
1184 if (ctl->reform_year < year
1185 || (year == ctl->reform_year && REFORMATION_MONTH < month)
1186 || (year == ctl->reform_year
1187 && month == REFORMATION_MONTH && 13 < day)) {
1188 return ((int64_t) year + (year / 4)
1189 - (year / 100) + (year / 400)
1190 + reform[month - 1] + day) % DAYS_IN_WEEK;
1191 }
1192 if (year < ctl->reform_year
1193 || (year == ctl->reform_year && month < REFORMATION_MONTH)
1194 || (year == ctl->reform_year && month == REFORMATION_MONTH && day < 3))
1195 return ((int64_t) year + year / 4 + old[month - 1] + day)
1196 % DAYS_IN_WEEK;
1197 return NONEDAY;
1198 }
1199
1200 /*
1201 * week_number
1202 * return the week number of a given date, 1..54.
1203 * Supports ISO-8601 and North American modes.
1204 * Day may be given as Julian day of the year mode, in which
1205 * case the month is disregarded entirely.
1206 */
1207 static int week_number(int day, int month, int32_t year, const struct cal_control *ctl)
1208 {
1209 int fday = 0, yday;
1210 const int wday = day_in_week(ctl, 1, JANUARY, year);
1211
1212 if (ctl->weektype & WEEK_NUM_ISO)
1213 fday = wday + (wday >= FRIDAY ? -2 : 5);
1214 else {
1215 /* WEEK_NUM_US: Jan 1 is always First week, that may
1216 * begin previous year. That means there is very seldom
1217 * more than 52 weeks, */
1218 fday = wday + 6;
1219 }
1220 /* For julian dates the month can be set to 1, the global julian
1221 * variable cannot be relied upon here, because we may recurse
1222 * internally for 31.12. which would not work. */
1223 if (day > DAYS_IN_MONTH)
1224 month = JANUARY;
1225
1226 yday = day_in_year(ctl, day, month, year);
1227 if (year == ctl->reform_year && yday >= YDAY_AFTER_MISSING)
1228 fday -= NUMBER_MISSING_DAYS;
1229
1230 /* Last year is last year */
1231 if (yday + fday < DAYS_IN_WEEK)
1232 return week_number(31, DECEMBER, year - 1, ctl);
1233
1234 /* Or it could be part of the next year. The reformation year had less
1235 * days than 365 making this check invalid, but reformation year ended
1236 * on Sunday and in week 51, so it's ok here. */
1237 if (ctl->weektype == WEEK_NUM_ISO && yday >= 363
1238 && day_in_week(ctl, day, month, year) >= MONDAY
1239 && day_in_week(ctl, day, month, year) <= WEDNESDAY
1240 && day_in_week(ctl, 31, DECEMBER, year) >= MONDAY
1241 && day_in_week(ctl, 31, DECEMBER, year) <= WEDNESDAY)
1242 return week_number(1, JANUARY, year + 1, ctl);
1243
1244 return (yday + fday) / DAYS_IN_WEEK;
1245 }
1246
1247 /*
1248 * week_to_day
1249 * return the yday of the first day in a given week inside
1250 * the given year. This may be something other than Monday
1251 * for ISO-8601 modes. For North American numbering this
1252 * always returns a Sunday.
1253 */
1254 static int week_to_day(const struct cal_control *ctl)
1255 {
1256 int yday, wday;
1257
1258 wday = day_in_week(ctl, 1, JANUARY, ctl->req.year);
1259 yday = ctl->req.week * DAYS_IN_WEEK - wday;
1260
1261 if (ctl->req.year == ctl->reform_year && yday >= YDAY_AFTER_MISSING)
1262 yday += NUMBER_MISSING_DAYS;
1263
1264 if (ctl->weektype & WEEK_NUM_ISO)
1265 yday -= (wday >= FRIDAY ? -2 : 5);
1266 else
1267 yday -= 6; /* WEEK_NUM_US */
1268 if (yday <= 0)
1269 return 1;
1270
1271 return yday;
1272 }
1273
1274 /*
1275 * Center string, handling multibyte characters appropriately.
1276 * In addition if the string is too large for the width it's truncated.
1277 * The number of trailing spaces may be 1 less than the number of leading spaces.
1278 */
1279 static int center_str(const char* src, char* dest,
1280 size_t dest_size, size_t width)
1281 {
1282 return mbsalign(src, dest, dest_size, &width,
1283 MBS_ALIGN_CENTER, MBA_UNIBYTE_FALLBACK);
1284 }
1285
1286 static void center(const char *str, size_t len, int separate)
1287 {
1288 char lineout[FMT_ST_CHARS];
1289
1290 center_str(str, lineout, ARRAY_SIZE(lineout), len);
1291 fputs(lineout, stdout);
1292
1293 if (separate)
1294 printf("%*s", separate, "");
1295 }
1296 static int left_str(const char* src, char* dest,
1297 size_t dest_size, size_t width)
1298 {
1299 return mbsalign(src, dest, dest_size, &width,
1300 MBS_ALIGN_LEFT, MBA_UNIBYTE_FALLBACK);
1301 }
1302
1303 static void left(const char *str, size_t len, int separate)
1304 {
1305 char lineout[FMT_ST_CHARS];
1306
1307 left_str(str, lineout, sizeof(lineout), len);
1308 fputs(lineout, stdout);
1309
1310 if (separate)
1311 printf("%*s", separate, "");
1312 }
1313
1314 static int parse_reform_year(const char *reform_year)
1315 {
1316 size_t i;
1317
1318 struct reform {
1319 char *name;
1320 int val;
1321 };
1322
1323 struct reform years[] = {
1324 {"gregorian", GREGORIAN},
1325 {"iso", ISO},
1326 {"1752", GB1752},
1327 {"julian", JULIAN},
1328 };
1329
1330 for (i = 0; i < ARRAY_SIZE(years); i++) {
1331 if (strcasecmp(reform_year, years[i].name) == 0)
1332 return years[i].val;
1333 }
1334 errx(EXIT_FAILURE, "invalid --reform value: '%s'", reform_year);
1335 }
1336
1337 static void __attribute__((__noreturn__)) usage(void)
1338 {
1339 FILE *out = stdout;
1340
1341 fputs(USAGE_HEADER, out);
1342 fprintf(out, _(" %s [options] [[[day] month] year]\n"), program_invocation_short_name);
1343 fprintf(out, _(" %s [options] <timestamp|monthname>\n"), program_invocation_short_name);
1344
1345 fputs(USAGE_SEPARATOR, out);
1346 fputs(_("Display a calendar, or some part of it.\n"), out);
1347 fputs(_("Without any arguments, display the current month.\n"), out);
1348
1349 fputs(USAGE_OPTIONS, out);
1350 fputs(_(" -1, --one show only a single month (default)\n"), out);
1351 fputs(_(" -3, --three show three months spanning the date\n"), out);
1352 fputs(_(" -n, --months <num> show num months starting with date's month\n"), out);
1353 fputs(_(" -S, --span span the date when displaying multiple months\n"), out);
1354 fputs(_(" -s, --sunday Sunday as first day of week\n"), out);
1355 fputs(_(" -m, --monday Monday as first day of week\n"), out);
1356 fputs(_(" -j, --julian use day-of-year for all calendars\n"), out);
1357 fputs(_(" --reform <val> Gregorian reform date (1752|gregorian|iso|julian)\n"), out);
1358 fputs(_(" --iso alias for --reform=iso\n"), out);
1359 fputs(_(" -y, --year show the whole year\n"), out);
1360 fputs(_(" -Y, --twelve show the next twelve months\n"), out);
1361 fputs(_(" -w, --week[=<num>] show US or ISO-8601 week numbers\n"), out);
1362 fputs(_(" -v, --vertical show day vertically instead of line\n"), out);
1363 fputs(_(" -c, --columns <width> amount of columns to use\n"), out);
1364 fprintf(out,
1365 _(" --color[=<when>] colorize messages (%s, %s or %s)\n"), "auto", "always", "never");
1366 fprintf(out,
1367 " %s\n", USAGE_COLORS_DEFAULT);
1368
1369 fputs(USAGE_SEPARATOR, out);
1370 fprintf(out, USAGE_HELP_OPTIONS(23));
1371 fprintf(out, USAGE_MAN_TAIL("cal(1)"));
1372
1373 exit(EXIT_SUCCESS);
1374 }
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