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+/*
+ * Copyright (c) 1989, 1993, 1994
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Kim Letkeman.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/* 1999-02-01 Jean-Francois Bignolles: added option '-m' to display
+ * monday as the first day of the week.
+ * 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
+ * - added Native Language Support
+ *
+ * 2000-09-01 Michael Charles Pruznick <dummy@netwiz.net>
+ * Added "-3" option to print prev/next month with current.
+ * Added overridable default MONTHS_IN_ROW and "-1" option to
+ * get traditional output when -3 is the default. I hope that
+ * enough people will like -3 as the default that one day the
+ * product can be shipped that way.
+ *
+ * 2001-05-07 Pablo Saratxaga <pablo@mandrakesoft.com>
+ * Fixed the bugs with multi-byte charset (zg: cjk, utf-8)
+ * displaying. made the 'month year' ("%s %d") header translatable
+ * so it can be adapted to conventions used by different languages
+ * added support to read "first_weekday" locale information
+ * still to do: support for 'cal_direction' (will require a major
+ * rewrite of the displaying) and proper handling of RTL scripts
+ */
+
+#include <sys/types.h>
+
+#include <ctype.h>
+#include <getopt.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+
+#include "c.h"
+#include "closestream.h"
+#include "colors.h"
+#include "nls.h"
+#include "mbsalign.h"
+#include "strutils.h"
+#include "optutils.h"
+#include "timeutils.h"
+#include "ttyutils.h"
+
+#define DOY_MONTH_WIDTH 27 /* -j month width */
+#define DOM_MONTH_WIDTH 20 /* month width */
+
+static int has_term = 0;
+static const char *Senter = "", *Sexit = ""; /* enter and exit standout mode */
+
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+# if defined(HAVE_NCURSESW_TERM_H)
+# include <ncursesw/term.h>
+# elif defined(HAVE_NCURSES_TERM_H)
+# include <ncurses/term.h>
+# elif defined(HAVE_TERM_H)
+# include <term.h>
+# endif
+#endif
+
+static int setup_terminal(char *term
+#if !defined(HAVE_LIBNCURSES) && !defined(HAVE_LIBNCURSESW)
+ __attribute__((__unused__))
+#endif
+ )
+{
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+ int ret;
+
+ if (setupterm(term, STDOUT_FILENO, &ret) != 0 || ret != 1)
+ return -1;
+#endif
+ return 0;
+}
+
+static void my_putstring(char *s)
+{
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+ if (has_term)
+ putp(s);
+ else
+#endif
+ fputs(s, stdout);
+}
+
+static const char *my_tgetstr(char *ss
+#if !defined(HAVE_LIBNCURSES) && !defined(HAVE_LIBNCURSESW)
+ __attribute__((__unused__))
+#endif
+ )
+{
+ const char *ret = NULL;
+
+#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
+ if (has_term)
+ ret = tigetstr(ss);
+#endif
+ if (!ret || ret == (char *)-1)
+ return "";
+ return ret;
+}
+
+#include "widechar.h"
+
+enum {
+ GREGORIAN = INT32_MIN,
+ ISO = INT32_MIN,
+ GB1752 = 1752,
+ DEFAULT_REFORM_YEAR = 1752,
+ JULIAN = INT32_MAX
+};
+
+enum {
+ SUNDAY = 0,
+ MONDAY,
+ TUESDAY,
+ WEDNESDAY,
+ THURSDAY,
+ FRIDAY,
+ SATURDAY,
+ DAYS_IN_WEEK,
+ NONEDAY
+};
+
+enum {
+ JANUARY = 1,
+ FEBRUARY,
+ MARCH,
+ APRIL,
+ MAY,
+ JUNE,
+ JULY,
+ AUGUST,
+ SEPTEMBER,
+ OCTOBER,
+ NOVEMBER,
+ DECEMBER
+};
+
+#define REFORMATION_MONTH SEPTEMBER
+#define NUMBER_MISSING_DAYS 11 /* 11 day correction */
+#define YDAY_AFTER_MISSING 258 /* 14th in Sep 1752 */
+
+#define MONTHS_IN_YEAR DECEMBER
+#define DAYS_IN_MONTH 31
+#define MAXDAYS 42 /* slots in a month array */
+#define SPACE -1 /* used in day array */
+
+#define SMALLEST_YEAR 1
+
+#define DAY_LEN 3 /* 3 spaces per day */
+#define WEEK_LEN (DAYS_IN_WEEK * DAY_LEN)
+#define MONTHS_IN_YEAR_ROW 3 /* month columns in year view */
+#define WNUM_LEN 3
+
+#define FMT_ST_CHARS 300 /* 90 suffices in most locales */
+
+static const int days_in_month[2][13] = {
+ {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+ {0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
+};
+
+enum {
+ WEEK_NUM_DISABLED = 0,
+ WEEK_NUM_MASK=0xff,
+ WEEK_NUM_ISO=0x100,
+ WEEK_NUM_US=0x200,
+};
+
+/* utf-8 can have up to 6 bytes per char; and an extra byte for ending \0 */
+static char day_headings[(WEEK_LEN + 1) * 6 + 1];
+
+struct cal_request {
+ int day;
+ int month;
+ int32_t year;
+ int week;
+ int start_month;
+};
+
+struct cal_control {
+ const char *full_month[MONTHS_IN_YEAR]; /* month names */
+ const char *abbr_month[MONTHS_IN_YEAR]; /* abbreviated month names */
+
+ int reform_year; /* Gregorian reform year */
+ int colormode; /* day and week number highlight */
+ int num_months; /* number of requested months */
+ int span_months; /* span the date */
+ int months_in_row; /* number of months horizontally in print out */
+ int weekstart; /* day the week starts, often Sun or Mon */
+ int weektype; /* WEEK_TYPE_{NONE,ISO,US} */
+ size_t day_width; /* day width in characters in printout */
+ size_t week_width; /* 7 * day_width + possible week num */
+ int gutter_width; /* spaces in between horizontal month outputs */
+ struct cal_request req; /* the times user is interested */
+ unsigned int julian:1, /* julian output */
+ header_year:1, /* print year number */
+ header_hint:1; /* does month name + year need two lines to fit */
+};
+
+struct cal_month {
+ int days[MAXDAYS]; /* the day numbers, or SPACE */
+ int weeks[MAXDAYS / DAYS_IN_WEEK];
+ int month;
+ int32_t year;
+ struct cal_month *next;
+};
+
+/* function prototypes */
+static int leap_year(const struct cal_control *ctl, int32_t year);
+static int monthname_to_number(struct cal_control *ctl, const char *name);
+static void headers_init(struct cal_control *ctl);
+static void cal_fill_month(struct cal_month *month, const struct cal_control *ctl);
+static void cal_output_header(struct cal_month *month, const struct cal_control *ctl);
+static void cal_output_months(struct cal_month *month, const struct cal_control *ctl);
+static void monthly(const struct cal_control *ctl);
+static void yearly(const struct cal_control *ctl);
+static int day_in_year(const struct cal_control *ctl, int day,
+ int month, int32_t year);
+static int day_in_week(const struct cal_control *ctl, int day,
+ int month, int32_t year);
+static int week_number(int day, int month, int32_t year, const struct cal_control *ctl);
+static int week_to_day(const struct cal_control *ctl);
+static int center_str(const char *src, char *dest, size_t dest_size, size_t width);
+static void center(const char *str, size_t len, int separate);
+static int parse_reform_year(const char *reform_year);
+static void __attribute__((__noreturn__)) usage(void);
+
+#ifdef TEST_CAL
+static time_t cal_time(time_t *t)
+{
+ char *str = getenv("CAL_TEST_TIME");
+
+ if (str) {
+ uint64_t x = strtou64_or_err(str, "failed to parse CAL_TEST_TIME");
+
+ *t = x;
+ return *t;
+ }
+
+ return time(t);
+}
+#else
+# define cal_time(t) time(t)
+#endif
+
+int main(int argc, char **argv)
+{
+ struct tm *local_time;
+ char *term;
+ time_t now;
+ int ch = 0, yflag = 0, Yflag = 0;
+
+ static struct cal_control ctl = {
+ .reform_year = DEFAULT_REFORM_YEAR,
+ .weekstart = SUNDAY,
+ .span_months = 0,
+ .colormode = UL_COLORMODE_UNDEF,
+ .weektype = WEEK_NUM_DISABLED,
+ .day_width = DAY_LEN,
+ .gutter_width = 2,
+ .req.day = 0,
+ .req.month = 0
+ };
+
+ enum {
+ OPT_COLOR = CHAR_MAX + 1,
+ OPT_ISO,
+ OPT_REFORM
+ };
+
+ static const struct option longopts[] = {
+ {"one", no_argument, NULL, '1'},
+ {"three", no_argument, NULL, '3'},
+ {"sunday", no_argument, NULL, 's'},
+ {"monday", no_argument, NULL, 'm'},
+ {"julian", no_argument, NULL, 'j'},
+ {"months", required_argument, NULL, 'n'},
+ {"span", no_argument, NULL, 'S'},
+ {"year", no_argument, NULL, 'y'},
+ {"week", optional_argument, NULL, 'w'},
+ {"color", optional_argument, NULL, OPT_COLOR},
+ {"reform", required_argument, NULL, OPT_REFORM},
+ {"iso", no_argument, NULL, OPT_ISO},
+ {"version", no_argument, NULL, 'V'},
+ {"twelve", no_argument, NULL, 'Y'},
+ {"help", no_argument, NULL, 'h'},
+ {NULL, 0, NULL, 0}
+ };
+
+ static const ul_excl_t excl[] = { /* rows and cols in ASCII order */
+ { 'Y','n','y' },
+ { 0 }
+ };
+ int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
+
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ atexit(close_stdout);
+
+ term = getenv("TERM");
+ if (term) {
+ has_term = setup_terminal(term) == 0;
+ if (has_term) {
+ Senter = my_tgetstr("smso");
+ Sexit = my_tgetstr("rmso");
+ }
+ }
+
+/*
+ * The traditional Unix cal utility starts the week at Sunday,
+ * while ISO 8601 starts at Monday. We read the start day from
+ * the locale database, which can be overridden with the
+ * -s (Sunday) or -m (Monday) options.
+ */
+#if HAVE_DECL__NL_TIME_WEEK_1STDAY
+ /*
+ * You need to use 2 locale variables to get the first day of the week.
+ * This is needed to support first_weekday=2 and first_workday=1 for
+ * the rare case where working days span across 2 weeks.
+ * This shell script shows the combinations and calculations involved:
+ *
+ * for LANG in en_US ru_RU fr_FR csb_PL POSIX; do
+ * printf "%s:\t%s + %s -1 = " $LANG $(locale week-1stday first_weekday)
+ * date -d"$(locale week-1stday) +$(($(locale first_weekday)-1))day" +%w
+ * done
+ *
+ * en_US: 19971130 + 1 -1 = 0 #0 = sunday
+ * ru_RU: 19971130 + 2 -1 = 1
+ * fr_FR: 19971201 + 1 -1 = 1
+ * csb_PL: 19971201 + 2 -1 = 2
+ * POSIX: 19971201 + 7 -1 = 0
+ */
+ {
+ int wfd;
+ union { unsigned int word; char *string; } val;
+ val.string = nl_langinfo(_NL_TIME_WEEK_1STDAY);
+
+ wfd = val.word;
+ wfd = day_in_week(&ctl, wfd % 100, (wfd / 100) % 100,
+ wfd / (100 * 100));
+ ctl.weekstart = (wfd + *nl_langinfo(_NL_TIME_FIRST_WEEKDAY) - 1) % DAYS_IN_WEEK;
+ }
+#endif
+ while ((ch = getopt_long(argc, argv, "13mjn:sSywYVh", longopts, NULL)) != -1) {
+
+ err_exclusive_options(ch, longopts, excl, excl_st);
+
+ switch(ch) {
+ case '1':
+ ctl.num_months = 1;
+ break;
+ case '3':
+ ctl.num_months = 3;
+ ctl.span_months = 1;
+ break;
+ case 's':
+ ctl.weekstart = SUNDAY; /* default */
+ break;
+ case 'm':
+ ctl.weekstart = MONDAY;
+ break;
+ case 'j':
+ ctl.julian = 1;
+ ctl.day_width = DAY_LEN + 1;
+ break;
+ case 'y':
+ yflag = 1;
+ break;
+ case 'Y':
+ Yflag = 1;
+ break;
+ case 'n':
+ ctl.num_months = strtou32_or_err(optarg,
+ _("invalid month argument"));
+ break;
+ case 'S':
+ ctl.span_months = 1;
+ break;
+ case 'w':
+ if (optarg) {
+ ctl.req.week = strtos32_or_err(optarg,
+ _("invalid week argument"));
+ if (ctl.req.week < 1 || 54 < ctl.req.week)
+ errx(EXIT_FAILURE,_("illegal week value: use 1-54"));
+ }
+ ctl.weektype = WEEK_NUM_US; /* default per weekstart */
+ break;
+ case OPT_COLOR:
+ ctl.colormode = UL_COLORMODE_AUTO;
+ if (optarg)
+ ctl.colormode = colormode_or_err(optarg,
+ _("unsupported color mode"));
+ break;
+ case OPT_REFORM:
+ ctl.reform_year = parse_reform_year(optarg);
+ break;
+ case OPT_ISO:
+ ctl.reform_year = ISO;
+ break;
+ case 'V':
+ printf(UTIL_LINUX_VERSION);
+ return EXIT_SUCCESS;
+ case 'h':
+ usage();
+ default:
+ errtryhelp(EXIT_FAILURE);
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (ctl.weektype) {
+ ctl.weektype = ctl.req.week & WEEK_NUM_MASK;
+ ctl.weektype |= (ctl.weekstart == MONDAY ? WEEK_NUM_ISO : WEEK_NUM_US);
+ ctl.week_width = (ctl.day_width * DAYS_IN_WEEK) + WNUM_LEN;
+ } else
+ ctl.week_width = ctl.day_width * DAYS_IN_WEEK;
+
+ if (argc == 1 && !isdigit_string(*argv)) {
+ usec_t x;
+ /* cal <timestamp> */
+ if (parse_timestamp(*argv, &x) == 0)
+ now = (time_t) (x / 1000000);
+ /* cal <monthname> */
+ else if ((ctl.req.month = monthname_to_number(&ctl, *argv)) > 0)
+ cal_time(&now); /* this year */
+ else
+ errx(EXIT_FAILURE, _("failed to parse timestamp or unknown month name: %s"), *argv);
+ argc = 0;
+ } else
+ cal_time(&now);
+
+ local_time = localtime(&now);
+
+ switch(argc) {
+ case 3:
+ ctl.req.day = strtos32_or_err(*argv++, _("illegal day value"));
+ if (ctl.req.day < 1 || DAYS_IN_MONTH < ctl.req.day)
+ errx(EXIT_FAILURE, _("illegal day value: use 1-%d"), DAYS_IN_MONTH);
+ /* fallthrough */
+ case 2:
+ if (isdigit(**argv))
+ ctl.req.month = strtos32_or_err(*argv++, _("illegal month value: use 1-12"));
+ else {
+ ctl.req.month = monthname_to_number(&ctl, *argv);
+ if (ctl.req.month < 0)
+ errx(EXIT_FAILURE, _("unknown month name: %s"), *argv);
+ argv++;
+ }
+ if (ctl.req.month < 1 || MONTHS_IN_YEAR < ctl.req.month)
+ errx(EXIT_FAILURE, _("illegal month value: use 1-12"));
+ /* fallthrough */
+ case 1:
+ ctl.req.year = strtos32_or_err(*argv++, _("illegal year value"));
+ if (ctl.req.year < SMALLEST_YEAR)
+ errx(EXIT_FAILURE, _("illegal year value: use positive integer"));
+ if (ctl.req.year == JULIAN)
+ errx(EXIT_FAILURE, _("illegal year value"));
+ if (ctl.req.day) {
+ int dm = days_in_month[leap_year(&ctl, ctl.req.year)]
+ [ctl.req.month];
+ if (ctl.req.day > dm)
+ errx(EXIT_FAILURE, _("illegal day value: use 1-%d"), dm);
+ ctl.req.day = day_in_year(&ctl, ctl.req.day,
+ ctl.req.month, ctl.req.year);
+ } else if ((int32_t) (local_time->tm_year + 1900) == ctl.req.year) {
+ ctl.req.day = local_time->tm_yday + 1;
+ }
+ if (!ctl.req.month && !ctl.req.week) {
+ ctl.req.month = local_time->tm_mon + 1;
+ if (!ctl.num_months)
+ yflag = 1;
+ }
+ break;
+ case 0:
+ ctl.req.day = local_time->tm_yday + 1;
+ ctl.req.year = local_time->tm_year + 1900;
+ if (!ctl.req.month)
+ ctl.req.month = local_time->tm_mon + 1;
+ break;
+ default:
+ warnx(_("bad usage"));
+ errtryhelp(EXIT_FAILURE);
+ }
+
+ if (0 < ctl.req.week) {
+ int yday = week_to_day(&ctl);
+ int leap = leap_year(&ctl, ctl.req.year);
+ int m = 1;
+
+ if (yday < 1)
+ errx(EXIT_FAILURE, _("illegal week value: year %d "
+ "doesn't have week %d"),
+ ctl.req.year, ctl.req.week);
+ while (m <= DECEMBER && yday > days_in_month[leap][m])
+ yday -= days_in_month[leap][m++];
+ if (DECEMBER < m && ctl.weektype & WEEK_NUM_ISO) {
+ /* In some years (e.g. 2010 in ISO mode) it's possible
+ * to have a remnant of week 53 starting the year yet
+ * the year in question ends during 52, in this case
+ * we're assuming that early remnant is being referred
+ * to if 53 is given as argument. */
+ if (ctl.req.week != week_number(31, DECEMBER, ctl.req.year - 1, &ctl))
+ errx(EXIT_FAILURE,
+ _("illegal week value: year %d "
+ "doesn't have week %d"),
+ ctl.req.year, ctl.req.week);
+ }
+ if (!ctl.req.month)
+ ctl.req.month = MONTHS_IN_YEAR < m ? 1 : m;
+ }
+
+ headers_init(&ctl);
+
+ if (!colors_init(ctl.colormode, "cal")) {
+ ctl.req.day = 0;
+ ctl.weektype &= ~WEEK_NUM_MASK;
+ }
+
+ if (yflag || Yflag) {
+ ctl.gutter_width = 3;
+ if (!ctl.num_months)
+ ctl.num_months = MONTHS_IN_YEAR;
+ if (yflag) {
+ ctl.req.start_month = 1; /* start from Jan */
+ ctl.header_year = 1; /* print year number */
+ }
+ }
+
+ if (ctl.num_months > 1 && ctl.months_in_row == 0) {
+ ctl.months_in_row = MONTHS_IN_YEAR_ROW; /* default */
+
+ if (isatty(STDOUT_FILENO)) {
+ int w = get_terminal_width(STDOUT_FILENO);
+ int mw = ctl.julian ? DOY_MONTH_WIDTH : DOM_MONTH_WIDTH;
+ int extra = ((w / mw) - 1) * ctl.gutter_width;
+ int new_n = (w - extra) / mw;
+
+ if (new_n < MONTHS_IN_YEAR_ROW)
+ ctl.months_in_row = new_n;
+ }
+ } else if (!ctl.months_in_row)
+ ctl.months_in_row = 1;
+
+ if (!ctl.num_months)
+ ctl.num_months = 1; /* display at least one month */
+
+ if (yflag || Yflag)
+ yearly(&ctl);
+ else
+ monthly(&ctl);
+
+ return EXIT_SUCCESS;
+}
+
+/* leap year -- account for gregorian reformation in 1752 */
+static int leap_year(const struct cal_control *ctl, int32_t year)
+{
+ if (year <= ctl->reform_year)
+ return !(year % 4);
+ else
+ return ( !(year % 4) && (year % 100) ) || !(year % 400);
+}
+
+static void init_monthnames(struct cal_control *ctl)
+{
+ size_t i;
+
+ if (ctl->full_month[0] != NULL)
+ return; /* already initialized */
+
+ for (i = 0; i < MONTHS_IN_YEAR; i++)
+ ctl->full_month[i] = nl_langinfo(ALTMON_1 + i);
+}
+
+static void init_abbr_monthnames(struct cal_control *ctl)
+{
+ size_t i;
+
+ if (ctl->abbr_month[0] != NULL)
+ return; /* already initialized */
+
+ for (i = 0; i < MONTHS_IN_YEAR; i++)
+ ctl->abbr_month[i] = nl_langinfo(_NL_ABALTMON_1 + i);
+}
+
+static int monthname_to_number(struct cal_control *ctl, const char *name)
+{
+ size_t i;
+
+ init_monthnames(ctl);
+ for (i = 0; i < MONTHS_IN_YEAR; i++)
+ if (strcasecmp(ctl->full_month[i], name) == 0)
+ return i + 1;
+
+ init_abbr_monthnames(ctl);
+ for (i = 0; i < MONTHS_IN_YEAR; i++)
+ if (strcasecmp(ctl->abbr_month[i], name) == 0)
+ return i + 1;
+
+ return -EINVAL;
+}
+
+static void headers_init(struct cal_control *ctl)
+{
+ size_t i, wd;
+ char *cur_dh = day_headings;
+ char tmp[FMT_ST_CHARS];
+ int year_len;
+
+ year_len = snprintf(tmp, sizeof(tmp), "%04d", ctl->req.year);
+
+ if (year_len < 0 || (size_t)year_len >= sizeof(tmp)) {
+ /* XXX impossible error */
+ return;
+ }
+
+ for (i = 0; i < DAYS_IN_WEEK; i++) {
+ size_t space_left;
+ wd = (i + ctl->weekstart) % DAYS_IN_WEEK;
+
+ if (i)
+ strcat(cur_dh++, " ");
+ space_left = sizeof(day_headings) - (cur_dh - day_headings);
+
+ if (space_left <= (ctl->day_width - 1))
+ break;
+ cur_dh += center_str(nl_langinfo(ABDAY_1 + wd), cur_dh,
+ space_left, ctl->day_width - 1);
+ }
+
+ init_monthnames(ctl);
+
+ for (i = 0; i < MONTHS_IN_YEAR; i++) {
+ /* The +1 after year_len is space in between month and year. */
+ if (ctl->week_width < strlen(ctl->full_month[i]) + year_len + 1)
+ ctl->header_hint = 1;
+ }
+}
+
+static void cal_fill_month(struct cal_month *month, const struct cal_control *ctl)
+{
+ int first_week_day = day_in_week(ctl, 1, month->month, month->year);
+ int month_days;
+ int i, j, weeklines = 0;
+
+ if (ctl->julian)
+ j = day_in_year(ctl, 1, month->month, month->year);
+ else
+ j = 1;
+ month_days = j + days_in_month[leap_year(ctl, month->year)][month->month];
+
+ /* True when Sunday is not first day in the output week. */
+ if (ctl->weekstart) {
+ first_week_day -= ctl->weekstart;
+ if (first_week_day < 0)
+ first_week_day = DAYS_IN_WEEK - ctl->weekstart;
+ month_days += ctl->weekstart - 1;
+ }
+
+ /* Fill day array. */
+ for (i = 0; i < MAXDAYS; i++) {
+ if (0 < first_week_day) {
+ month->days[i] = SPACE;
+ first_week_day--;
+ continue;
+ }
+ if (j < month_days) {
+ if (month->year == ctl->reform_year &&
+ month->month == REFORMATION_MONTH &&
+ (j == 3 || j == 247))
+ j += NUMBER_MISSING_DAYS;
+ month->days[i] = j;
+ j++;
+ continue;
+ }
+ month->days[i] = SPACE;
+ weeklines++;
+ }
+
+ /* Add week numbers */
+ if (ctl->weektype) {
+ int weeknum = week_number(1, month->month, month->year, ctl);
+ weeklines = MAXDAYS / DAYS_IN_WEEK - weeklines / DAYS_IN_WEEK;
+ for (i = 0; i < MAXDAYS / DAYS_IN_WEEK; i++) {
+ if (0 < weeklines) {
+ if (52 < weeknum)
+ weeknum = week_number(month->days[i * DAYS_IN_WEEK], month->month, month->year, ctl);
+ month->weeks[i] = weeknum++;
+ } else
+ month->weeks[i] = SPACE;
+ weeklines--;
+ }
+ }
+}
+
+static void cal_output_header(struct cal_month *month, const struct cal_control *ctl)
+{
+ char out[FMT_ST_CHARS];
+ struct cal_month *i;
+
+ if (ctl->header_hint || ctl->header_year) {
+ for (i = month; i; i = i->next) {
+ snprintf(out, sizeof(out), "%s", ctl->full_month[i->month - 1]);
+ center(out, ctl->week_width - 1, i->next == NULL ? 0 : ctl->gutter_width);
+ }
+ if (!ctl->header_year) {
+ my_putstring("\n");
+ for (i = month; i; i = i->next) {
+ snprintf(out, sizeof(out), "%04d", i->year);
+ center(out, ctl->week_width - 1, i->next == NULL ? 0 : ctl->gutter_width);
+ }
+ }
+ } else {
+ for (i = month; i; i = i->next) {
+ snprintf(out, sizeof(out), "%s %04d", ctl->full_month[i->month - 1], i->year);
+ center(out, ctl->week_width - 1, i->next == NULL ? 0 : ctl->gutter_width);
+ }
+ }
+ my_putstring("\n");
+ for (i = month; i; i = i->next) {
+ if (ctl->weektype) {
+ if (ctl->julian)
+ snprintf(out, sizeof(out), "%*s%s", (int)ctl->day_width - 1, "", day_headings);
+ else
+ snprintf(out, sizeof(out), "%*s%s", (int)ctl->day_width, "", day_headings);
+ my_putstring(out);
+ } else
+ my_putstring(day_headings);
+ if (i->next != NULL) {
+ snprintf(out, sizeof(out), "%*s", ctl->gutter_width, "");
+ my_putstring(out);
+ }
+ }
+ my_putstring("\n");
+}
+
+static void cal_output_months(struct cal_month *month, const struct cal_control *ctl)
+{
+ char out[FMT_ST_CHARS];
+ int reqday, week_line, d;
+ int skip;
+ struct cal_month *i;
+
+ for (week_line = 0; week_line < MAXDAYS / DAYS_IN_WEEK; week_line++) {
+ for (i = month; i; i = i->next) {
+ /* Determine the day that should be highlighted. */
+ reqday = 0;
+ if (i->month == ctl->req.month && i->year == ctl->req.year) {
+ if (ctl->julian)
+ reqday = ctl->req.day;
+ else
+ reqday = ctl->req.day + 1 -
+ day_in_year(ctl, 1, i->month,
+ i->year);
+ }
+
+ if (ctl->weektype) {
+ if (0 < i->weeks[week_line]) {
+ if ((ctl->weektype & WEEK_NUM_MASK) ==
+ i->weeks[week_line])
+ snprintf(out, sizeof(out), "%s%2d%s",
+ Senter, i->weeks[week_line],
+ Sexit);
+ else
+ snprintf(out, sizeof(out), "%2d", i->weeks[week_line]);
+ } else
+ snprintf(out, sizeof(out), "%2s", "");
+ my_putstring(out);
+ skip = ctl->day_width;
+ } else
+ /* First day of the week is one char narrower than the other days,
+ * unless week number is printed. */
+ skip = ctl->day_width - 1;
+
+ for (d = DAYS_IN_WEEK * week_line;
+ d < DAYS_IN_WEEK * week_line + DAYS_IN_WEEK; d++) {
+ if (0 < i->days[d]) {
+ if (reqday == i->days[d])
+ snprintf(out, sizeof(out), "%*s%s%*d%s",
+ skip - (ctl->julian ? 3 : 2),
+ "", Senter, (ctl->julian ? 3 : 2),
+ i->days[d], Sexit);
+ else
+ snprintf(out, sizeof(out), "%*d", skip, i->days[d]);
+ } else
+ snprintf(out, sizeof(out), "%*s", skip, "");
+ my_putstring(out);
+ if (skip < (int)ctl->day_width)
+ skip++;
+ }
+ if (i->next != NULL) {
+ snprintf(out, sizeof(out), "%*s", ctl->gutter_width, "");
+ my_putstring(out);
+ }
+ }
+ if (i == NULL)
+ my_putstring("\n");
+ }
+}
+
+static void monthly(const struct cal_control *ctl)
+{
+ struct cal_month m1,m2,m3, *m;
+ int i, rows, month = ctl->req.start_month ? ctl->req.start_month : ctl->req.month;
+ int32_t year = ctl->req.year;
+
+ /* cal -3, cal -Y --span, etc. */
+ if (ctl->span_months) {
+ int new_month = month - ctl->num_months / 2;
+ if (new_month < 1) {
+ new_month *= -1;
+ year -= (new_month / MONTHS_IN_YEAR) + 1;
+
+ if (new_month > MONTHS_IN_YEAR)
+ new_month %= MONTHS_IN_YEAR;
+ month = MONTHS_IN_YEAR - new_month;
+ } else
+ month = new_month;
+ }
+
+ m1.next = (ctl->months_in_row > 1) ? &m2 : NULL;
+ m2.next = (ctl->months_in_row > 2) ? &m3 : NULL;
+ m3.next = NULL;
+
+ rows = (ctl->num_months - 1) / ctl->months_in_row;
+ for (i = 0; i < rows + 1 ; i++){
+ if (i == rows){
+ switch (ctl->num_months % ctl->months_in_row){
+ case 1:
+ m1.next = NULL;
+ /* fallthrough */
+ case 2:
+ m2.next = NULL;
+ /* fallthrough */
+ }
+ }
+ for (m = &m1; m; m = m->next){
+ m->month = month++;
+ m->year = year;
+ if (MONTHS_IN_YEAR < month) {
+ year++;
+ month = 1;
+ }
+ cal_fill_month(m, ctl);
+ }
+ cal_output_header(&m1, ctl);
+ cal_output_months(&m1, ctl);
+ }
+}
+
+static void yearly(const struct cal_control *ctl)
+{
+ char out[FMT_ST_CHARS];
+ int year_width = 0;
+
+ year_width += (ctl->week_width + 1) * (ctl->julian ? 2 : 3);
+ if (ctl->julian)
+ year_width--;
+
+ if (ctl->header_year) {
+ snprintf(out, sizeof(out), "%04d", ctl->req.year);
+ center(out, year_width, 0);
+ my_putstring("\n\n");
+ }
+ monthly(ctl);
+}
+
+/*
+ * day_in_year --
+ * return the 1 based day number within the year
+ */
+static int day_in_year(const struct cal_control *ctl,
+ int day, int month, int32_t year)
+{
+ int i, leap;
+
+ leap = leap_year(ctl, year);
+ for (i = 1; i < month; i++)
+ day += days_in_month[leap][i];
+ return day;
+}
+
+/*
+ * day_in_week
+ * return the 0 based day number for any date from 1 Jan. 1 to
+ * 31 Dec. 9999. Assumes the Gregorian reformation eliminates
+ * 3 Sep. 1752 through 13 Sep. 1752, and returns invalid weekday
+ * during the period of 11 days.
+ */
+static int day_in_week(const struct cal_control *ctl, int day,
+ int month, int32_t year)
+{
+ /*
+ * The magic constants in the reform[] array are, in a simplified
+ * sense, the remaining days after slicing into one week periods the total
+ * days from the beginning of the year to the target month. That is,
+ * weeks + reform[] days gets us to the target month. The exception is,
+ * that for the months past February 'DOY - 1' must be used.
+ *
+ * DoY (Day of Year): total days to the target month
+ *
+ * Month 1 2 3 4 5 6 7 8 9 10 11 12
+ * DoY 0 31 59 90 120 151 181 212 243 273 304 334
+ * DoY % 7 0 3
+ * DoY - 1 % 7 - -- 2 5 0 3 5 1 4 6 2 4
+ * reform[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
+ *
+ * Note: these calculations are for non leap years.
+ */
+ static const int reform[] = { 0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4 };
+ static const int old[] = { 5, 1, 0, 3, 5, 1, 3, 6, 2, 4, 0, 2 };
+
+ if (year != ctl->reform_year + 1)
+ year -= month < MARCH;
+ else
+ year -= (month < MARCH) + 14;
+ if (ctl->reform_year < year
+ || (year == ctl->reform_year && REFORMATION_MONTH < month)
+ || (year == ctl->reform_year
+ && month == REFORMATION_MONTH && 13 < day)) {
+ return ((int64_t) year + (year / 4)
+ - (year / 100) + (year / 400)
+ + reform[month - 1] + day) % DAYS_IN_WEEK;
+ }
+ if (year < ctl->reform_year
+ || (year == ctl->reform_year && month < REFORMATION_MONTH)
+ || (year == ctl->reform_year && month == REFORMATION_MONTH && day < 3))
+ return ((int64_t) year + year / 4 + old[month - 1] + day)
+ % DAYS_IN_WEEK;
+ return NONEDAY;
+}
+
+/*
+ * week_number
+ * return the week number of a given date, 1..54.
+ * Supports ISO-8601 and North American modes.
+ * Day may be given as Julian day of the year mode, in which
+ * case the month is disregarded entirely.
+ */
+static int week_number(int day, int month, int32_t year, const struct cal_control *ctl)
+{
+ int fday = 0, yday;
+ const int wday = day_in_week(ctl, 1, JANUARY, year);
+
+ if (ctl->weektype & WEEK_NUM_ISO)
+ fday = wday + (wday >= FRIDAY ? -2 : 5);
+ else {
+ /* WEEK_NUM_US: Jan 1 is always First week, that may
+ * begin previous year. That means there is very seldom
+ * more than 52 weeks, */
+ fday = wday + 6;
+ }
+ /* For julian dates the month can be set to 1, the global julian
+ * variable cannot be relied upon here, because we may recurse
+ * internally for 31.12. which would not work. */
+ if (day > DAYS_IN_MONTH)
+ month = JANUARY;
+
+ yday = day_in_year(ctl, day, month, year);
+ if (year == ctl->reform_year && yday >= YDAY_AFTER_MISSING)
+ fday -= NUMBER_MISSING_DAYS;
+
+ /* Last year is last year */
+ if (yday + fday < DAYS_IN_WEEK)
+ return week_number(31, DECEMBER, year - 1, ctl);
+
+ /* Or it could be part of the next year. The reformation year had less
+ * days than 365 making this check invalid, but reformation year ended
+ * on Sunday and in week 51, so it's ok here. */
+ if (ctl->weektype == WEEK_NUM_ISO && yday >= 363
+ && day_in_week(ctl, day, month, year) >= MONDAY
+ && day_in_week(ctl, day, month, year) <= WEDNESDAY
+ && day_in_week(ctl, 31, DECEMBER, year) >= MONDAY
+ && day_in_week(ctl, 31, DECEMBER, year) <= WEDNESDAY)
+ return week_number(1, JANUARY, year + 1, ctl);
+
+ return (yday + fday) / DAYS_IN_WEEK;
+}
+
+/*
+ * week_to_day
+ * return the yday of the first day in a given week inside
+ * the given year. This may be something other than Monday
+ * for ISO-8601 modes. For North American numbering this
+ * always returns a Sunday.
+ */
+static int week_to_day(const struct cal_control *ctl)
+{
+ int yday, wday;
+
+ wday = day_in_week(ctl, 1, JANUARY, ctl->req.year);
+ yday = ctl->req.week * DAYS_IN_WEEK - wday;
+
+ if (ctl->req.year == ctl->reform_year && yday >= YDAY_AFTER_MISSING)
+ yday += NUMBER_MISSING_DAYS;
+
+ if (ctl->weektype & WEEK_NUM_ISO)
+ yday -= (wday >= FRIDAY ? -2 : 5);
+ else
+ yday -= 6; /* WEEK_NUM_US */
+ if (yday <= 0)
+ return 1;
+
+ return yday;
+}
+
+/*
+ * Center string, handling multibyte characters appropriately.
+ * In addition if the string is too large for the width it's truncated.
+ * The number of trailing spaces may be 1 less than the number of leading spaces.
+ */
+static int center_str(const char* src, char* dest,
+ size_t dest_size, size_t width)
+{
+ return mbsalign(src, dest, dest_size, &width,
+ MBS_ALIGN_CENTER, MBA_UNIBYTE_FALLBACK);
+}
+
+static void center(const char *str, size_t len, int separate)
+{
+ char lineout[FMT_ST_CHARS];
+
+ center_str(str, lineout, ARRAY_SIZE(lineout), len);
+ my_putstring(lineout);
+
+ if (separate) {
+ snprintf(lineout, sizeof(lineout), "%*s", separate, "");
+ my_putstring(lineout);
+ }
+}
+
+static int parse_reform_year(const char *reform_year)
+{
+ size_t i;
+
+ struct reform {
+ char *name;
+ int val;
+ };
+
+ struct reform years[] = {
+ {"gregorian", GREGORIAN},
+ {"iso", ISO},
+ {"1752", GB1752},
+ {"julian", JULIAN},
+ };
+
+ for (i = 0; i < ARRAY_SIZE(years); i++) {
+ if (strcasecmp(reform_year, years[i].name) == 0) {
+ return years[i].val;
+ }
+ }
+ errx(EXIT_FAILURE, "invalid --reform value: '%s'", reform_year);
+}
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fputs(USAGE_HEADER, out);
+ fprintf(out, _(" %s [options] [[[day] month] year]\n"), program_invocation_short_name);
+ fprintf(out, _(" %s [options] <timestamp|monthname>\n"), program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Display a calendar, or some part of it.\n"), out);
+ fputs(_("Without any arguments, display the current month.\n"), out);
+
+ fputs(USAGE_OPTIONS, out);
+ fputs(_(" -1, --one show only a single month (default)\n"), out);
+ fputs(_(" -3, --three show three months spanning the date\n"), out);
+ fputs(_(" -n, --months <num> show num months starting with date's month\n"), out);
+ fputs(_(" -S, --span span the date when displaying multiple months\n"), out);
+ fputs(_(" -s, --sunday Sunday as first day of week\n"), out);
+ fputs(_(" -m, --monday Monday as first day of week\n"), out);
+ fputs(_(" -j, --julian use day-of-year for all calendars\n"), out);
+ fputs(_(" --reform <val> Gregorian reform date (1752|gregorian|iso|julian)\n"), out);
+ fputs(_(" --iso alias for --reform=iso\n"), out);
+ fputs(_(" -y, --year show the whole year\n"), out);
+ fputs(_(" -Y, --twelve show the next twelve months\n"), out);
+ fputs(_(" -w, --week[=<num>] show US or ISO-8601 week numbers\n"), out);
+ fputs(_(" --color[=<when>] colorize messages (auto, always or never)\n"), out);
+ fprintf(out,
+ " %s\n", USAGE_COLORS_DEFAULT);
+
+ fputs(USAGE_SEPARATOR, out);
+ printf(USAGE_HELP_OPTIONS(23));
+ printf(USAGE_MAN_TAIL("cal(1)"));
+
+ exit(EXIT_SUCCESS);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-30 04:29:16 +0000