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util-linux/misc-utils/cal.c

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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 over-ridable default NUM_MONTHS 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 <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"
#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW)
# ifdef HAVE_NCURSES_H
# include <ncurses.h>
# elif defined(HAVE_NCURSES_NCURSES_H)
# include <ncurses/ncurses.h>
# endif
# include <term.h>
static void my_setupterm(const char *term, int fildes, int *errret)
{
setupterm((char *)term, fildes, errret);
}
static void my_putstring(char *s)
{
putp(s);
}
static const char *my_tgetstr(char *s __attribute__((__unused__)), char *ss)
{
const char *ret = tigetstr(ss);
if (!ret || ret == (char *)-1)
return "";
return ret;
}
#elif defined(HAVE_LIBTERMCAP)
# include <termcap.h>
static char termbuffer[4096];
static char tcbuffer[4096];
static char *strbuf = termbuffer;
static void my_setupterm(const char *term, int fildes __attribute__((__unused__)), int *errret)
{
*errret = tgetent(tcbuffer, term);
}
static void my_putstring(char *s)
{
tputs(s, 1, putchar);
}
static const char *my_tgetstr(char *s, char *ss __attribute__((__unused__)))
{
const char *ret = tgetstr(s, &strbuf);
if (!ret)
return "";
return ret;
}
#else /* ! (HAVE_LIBTERMCAP || HAVE_LIBNCURSES || HAVE_LIBNCURSESW) */
static void my_putstring(char *s)
{
fputs(s, stdout);
}
#endif /* end of LIBTERMCAP / NCURSES */
#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW) || defined(HAVE_LIBTERMCAP)
static const char *term="";
#endif
static const char *Senter="", *Sexit="";/* enter and exit standout mode */
#include "widechar.h"
/* allow compile-time define to over-ride default */
#ifndef NUM_MONTHS
# define NUM_MONTHS 1
#endif
#if ( NUM_MONTHS != 1 && NUM_MONTHS !=3 )
# error NUM_MONTHS must be 1 or 3
#endif
enum {
SUNDAY = 0,
MONDAY,
TUESDAY,
WEDNESDAY,
THURSDAY,
FRIDAY,
SATURDAY,
DAYS_IN_WEEK,
NONEDAY
};
#define FIRST_WEEKDAY SATURDAY /* Jan 1st, 1 was a Saturday */
#define REFORMATION_YEAR 1752 /* Signed-off-by: Lord Chesterfield */
#define REFORMATION_MONTH 9 /* September */
#define FIRST_MISSING_DAY 639799 /* 3 Sep 1752 */
#define NUMBER_MISSING_DAYS 11 /* 11 day correction */
#define YDAY_AFTER_MISSING 258 /* 14th in Sep 1752 */
#define DAYS_IN_YEAR 365 /* the common case, leap years are calculated */
#define MONTHS_IN_YEAR 12
#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 HEAD_SEP 2
#define MONTH_COLS 3 /* month columns in year view */
#define WNUM_LEN 3
#define TODAY_FLAG 0x400 /* flag day for highlighting */
#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;
};
struct cal_control {
const char *full_month[MONTHS_IN_YEAR]; /* month names */
int colormode; /* day and week number highlight */
int num_months; /* 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 */
yflag:1, /* print whole year */
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(int32_t year);
static void headers_init(struct cal_control *ctl);
static void set_consecutive_months(struct cal_month *month, int m, int32_t y);
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 monthly3(const struct cal_control *ctl);
static void yearly(const struct cal_control *ctl);
static int day_in_year(int day, int month, int32_t year);
static int day_in_week(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 void __attribute__((__noreturn__)) usage(FILE *out);
int main(int argc, char **argv)
{
struct tm *local_time;
time_t now;
int ch;
static struct cal_control ctl = {
.weekstart = SUNDAY,
.num_months = NUM_MONTHS,
.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
};
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'},
{"year", no_argument, NULL, 'y'},
{"week", optional_argument, NULL, 'w'},
{"color", optional_argument, NULL, OPT_COLOR},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
atexit(close_stdout);
#if defined(HAVE_LIBNCURSES) || defined(HAVE_LIBNCURSESW) || defined(HAVE_LIBTERMCAP)
if ((term = getenv("TERM"))) {
int ret;
my_setupterm(term, STDOUT_FILENO, &ret);
if (ret > 0) {
Senter = my_tgetstr("so","smso");
Sexit = my_tgetstr("se","rmso");
}
}
#endif
/*
* 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(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, "13mjsywVh", longopts, NULL)) != -1)
switch(ch) {
case '1':
ctl.num_months = 1; /* default */
break;
case '3':
ctl.num_months = 3;
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':
ctl.yflag = 1;
break;
case 'w':
if (optarg) {
ctl.req.week = strtos32_or_err(optarg,
_("invalid week argument"));
if (ctl.req.week < 1 || 53 < ctl.req.week)
errx(EXIT_FAILURE,_("illegal week value: use 1-53"));
}
ctl.weektype = WEEK_NUM_US; /* default per weekstart */
break;
case OPT_COLOR:
if (optarg)
ctl.colormode = colormode_or_err(optarg,
_("unsupported color mode"));
break;
case 'V':
printf(UTIL_LINUX_VERSION);
return EXIT_SUCCESS;
case 'h':
usage(stdout);
case '?':
default:
usage(stderr);
}
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;
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:
ctl.req.month = strtos32_or_err(*argv++, _("illegal month value: use 1-12"));
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 == INT32_MAX)
errx(EXIT_FAILURE, _("illegal year value"));
if (ctl.req.day) {
int dm = days_in_month[leap_year(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.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;
ctl.yflag = 1;
}
break;
case 0:
ctl.req.day = local_time->tm_yday + 1;
ctl.req.year = local_time->tm_year + 1900;
ctl.req.month = local_time->tm_mon + 1;
break;
default:
usage(stderr);
}
if (0 < ctl.req.week) {
int yday = week_to_day(&ctl);
int leap = leap_year(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 <= 12 && yday > days_in_month[leap][m])
yday -= days_in_month[leap][m++];
if (m > 12) {
/* 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, 12, 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 = 12 < m ? 1 : m;
}
headers_init(&ctl);
if (!colors_init(ctl.colormode, "cal")) {
ctl.req.day = 0;
ctl.weektype &= ~WEEK_NUM_MASK;
}
if (ctl.yflag) {
if (ctl.julian)
ctl.num_months = MONTH_COLS - 1;
else
ctl.num_months = MONTH_COLS;
ctl.gutter_width = 3;
yearly(&ctl);
} else if (ctl.num_months == 1)
monthly(&ctl);
else if (ctl.num_months == 3)
monthly3(&ctl);
return EXIT_SUCCESS;
}
/* leap year -- account for gregorian reformation in 1752 */
static int leap_year(int32_t year)
{
if (year <= REFORMATION_YEAR)
return !(year % 4);
else
return ( !(year % 4) && (year % 100) ) || !(year % 400);
}
static void headers_init(struct cal_control *ctl)
{
size_t i, wd;
char *cur_dh = day_headings;
char tmp[FMT_ST_CHARS];
size_t year_len;
year_len = snprintf(tmp, sizeof(tmp), "%d", ctl->req.year);
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);
}
for (i = 0; i < MONTHS_IN_YEAR; i++) {
ctl->full_month[i] = nl_langinfo(MON_1 + 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 set_consecutive_months(struct cal_month *month, int m, int32_t y)
{
struct cal_month *i;
for (i = month; i; i = i->next) {
i->month = m++;
i->year = y;
if (MONTHS_IN_YEAR < m) {
m = 1;
y++;
}
}
}
static void cal_fill_month(struct cal_month *month, const struct cal_control *ctl)
{
int first_week_day = day_in_week(1, month->month, month->year);
int month_days;
int i, j, weeklines = 0;
if (ctl->julian)
j = day_in_year(1, month->month, month->year);
else
j = 1;
month_days = j + days_in_month[leap_year(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 == 1752 && month->month == 9 && (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)
month->weeks[i] = weeknum++;
else
month->weeks[i] = SPACE;
weeklines--;
if (52 < weeknum && i == 0)
weeknum = week_number(month->days[DAYS_IN_WEEK * (i + 1)], 1, month->year, ctl);
else if (52 < weeknum)
weeknum = week_number(31, 12, month->year, ctl);
}
}
}
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->yflag) {
for (i = month; i; i = i->next) {
sprintf(out, _("%s"), ctl->full_month[i->month - 1]);
center(out, ctl->week_width - 1, i->next == NULL ? 0 : ctl->gutter_width);
}
if (!ctl->yflag) {
my_putstring("\n");
for (i = month; i; i = i->next) {
sprintf(out, _("%d"), i->year);
center(out, ctl->week_width - 1, i->next == NULL ? 0 : ctl->gutter_width);
}
}
} else {
for (i = month; i; i = i->next) {
sprintf(out, _("%s %d"), 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)
sprintf(out, "%*s%s", (int)ctl->day_width - 1, "", day_headings);
else
sprintf(out, "%*s%s", (int)ctl->day_width, "", day_headings);
my_putstring(out);
} else
my_putstring(day_headings);
if (i->next != NULL) {
sprintf(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(1, i->month,
i->year);
}
if (ctl->weektype) {
if (0 < i->weeks[week_line]) {
if ((ctl->weektype & WEEK_NUM_MASK) ==
i->weeks[week_line])
sprintf(out, "%s%2d%s", Senter, i->weeks[week_line],
Sexit);
else
sprintf(out, "%2d", i->weeks[week_line]);
} else
sprintf(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])
sprintf(out, "%*s%s%*d%s", skip - (ctl->julian ? 3 : 2),
"", Senter, (ctl->julian ? 3 : 2),
i->days[d], Sexit);
else
sprintf(out, "%*d", skip, i->days[d]);
} else
sprintf(out, "%*s", skip, "");
my_putstring(out);
if (skip < (int)ctl->day_width)
skip++;
}
if (i->next != NULL) {
sprintf(out, "%*s", ctl->gutter_width, "");
my_putstring(out);
}
}
if (i == NULL) {
sprintf(out, "%*s\n", ctl->gutter_width - (ctl->yflag ? 0 : 1), "");
my_putstring(out);
}
}
}
static void monthly(const struct cal_control *ctl)
{
struct cal_month month;
month.month = ctl->req.month;
month.year = ctl->req.year;
month.next = NULL;
cal_fill_month(&month, ctl);
cal_output_header(&month, ctl);
cal_output_months(&month, ctl);
}
static void monthly3(const struct cal_control *ctl)
{
struct cal_month m1, m2, m3, *i;
int first_month;
int32_t first_year;
m1.next = &m2;
m2.next = &m3;
m3.next = NULL;
if (ctl->req.month == 1) {
first_month = MONTHS_IN_YEAR;
first_year = ctl->req.year - 1;
} else {
first_month = ctl->req.month - 1;
first_year = ctl->req.year;
}
set_consecutive_months(&m1, first_month, first_year);
for (i = &m1; i; i = i->next)
cal_fill_month(i, ctl);
cal_output_header(&m1, ctl);
cal_output_months(&m1, ctl);
}
static void yearly(const struct cal_control *ctl)
{
struct cal_month m1, m2, m3, *i;
int month;
char out[FMT_ST_CHARS];
int year_width = 0;
m1.next = &m2;
if (ctl->julian)
m2.next = NULL;
else {
m2.next = &m3;
m3.next = NULL;
}
/* year header */
for (i = &m1; i; i = i->next)
year_width += ctl->week_width + 1;
if (ctl->julian)
year_width--;
sprintf(out, "%d", ctl->req.year);
center(out, year_width, 0);
my_putstring("\n\n");
for (month = 1; month < MONTHS_IN_YEAR; month += ctl->julian ? 2 : 3) {
set_consecutive_months(&m1, month, ctl->req.year);
for (i = &m1; i; i = i->next)
cal_fill_month(i, ctl);
cal_output_header(&m1, ctl);
cal_output_months(&m1, ctl);
}
/* Is empty line at the end year output really needed? */
my_putstring("\n");
}
/*
* day_in_year --
* return the 1 based day number within the year
*/
static int day_in_year(int day, int month, int32_t year)
{
int i, leap;
leap = leap_year(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(int day, int month, int32_t year)
{
static const int reform[] = {
SUNDAY, WEDNESDAY, TUESDAY, FRIDAY, SUNDAY, WEDNESDAY,
FRIDAY, MONDAY, THURSDAY, SATURDAY, TUESDAY, THURSDAY
};
static const int old[] = {
FRIDAY, MONDAY, SUNDAY, WEDNESDAY, FRIDAY, MONDAY,
WEDNESDAY, SATURDAY, TUESDAY, THURSDAY, SUNDAY, TUESDAY
};
if (year != 1753)
year -= month < 3;
else
year -= (month < 3) + 14;
if (REFORMATION_YEAR < year
|| (year == REFORMATION_YEAR && 9 < month)
|| (year == REFORMATION_YEAR && month == 9 && 13 < day))
return (year + (year / 4) - (year / 100) + (year / 400) + reform[month - 1] +
day) % 7;
if (year < REFORMATION_YEAR
|| (year == REFORMATION_YEAR && month < 9)
|| (year == REFORMATION_YEAR && month == 9 && day < 3))
return (year + year / 4 + old[month - 1] + day) % 7;
return NONEDAY;
}
/*
* week_number
* return the week number of a given date, 1..53.
* 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;
int wday = day_in_week(1, 1, year);
if (ctl->weektype & WEEK_NUM_ISO)
fday = wday + (wday >= FRIDAY ? -2 : 5);
else
/* WEEK_NUM_US
* - according to gcal, the first Sun is in the first week
* - according to wikipedia, the first Sat is in the first week
*/
fday = wday + (wday == SUNDAY ? 6 : -1);
/* 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 > 31)
month = 1;
yday = day_in_year(day,month,year);
if (year == REFORMATION_YEAR) {
if (yday >= YDAY_AFTER_MISSING)
fday -= NUMBER_MISSING_DAYS;
}
/* Last year is last year */
if (yday + fday < 7)
return week_number(31, 12, 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(day, month, year) >= MONDAY
&& day_in_week(day, month, year) <= WEDNESDAY
&& day_in_week(31, 12, year) >= MONDAY
&& day_in_week(31, 12, year) <= WEDNESDAY)
return week_number(1, 1, year + 1, ctl);
return (yday + fday) / 7;
}
/*
* 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(1, 1, ctl->req.year);
yday = ctl->req.week * 7 - wday;
if (ctl->weektype & WEEK_NUM_ISO)
yday -= (wday >= FRIDAY ? -2 : 5);
else
yday -= (wday == SUNDAY ? 6 : -1); /* 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 void __attribute__ ((__noreturn__)) usage(FILE * out)
{
fputs(USAGE_HEADER, out);
fprintf(out, _(" %s [options] [[[day] month] year]\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(_(" -s, --sunday Sunday as first day of week\n"), out);
fputs(_(" -m, --monday Monday as first day of week\n"), out);
fputs(_(" -j, --julian output Julian dates\n"), out);
fputs(_(" -y, --year show the whole year\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);
fputs(USAGE_SEPARATOR, out);
fputs(USAGE_HELP, out);
fputs(USAGE_VERSION, out);
fprintf(out, USAGE_MAN_TAIL("cal(1)"));
exit(out == stderr ? EXIT_FAILURE : EXIT_SUCCESS);
}
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