Replaced by ncal
This commit is contained in:
Wolfgang Helbig
parent
2abc1ef602
commit
2c7dad3eea
@ -1,5 +0,0 @@
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# @(#)Makefile 8.1 (Berkeley) 6/6/93
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PROG= cal
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.include <bsd.prog.mk>
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@ -1,42 +0,0 @@
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The cal(1) date routines were written from scratch, basically from first
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principles. The algorithm for calculating the day of week from any
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Gregorian date was "reverse engineered". This was necessary as most of
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the documented algorithms have to do with date calculations for other
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calendars (e.g. julian) and are only accurate when converted to gregorian
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within a narrow range of dates.
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1 Jan 1 is a Saturday because that's what cal says and I couldn't change
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that even if I was dumb enough to try. From this we can easily calculate
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the day of week for any date. The algorithm for a zero based day of week:
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calculate the number of days in all prior years (year-1)*365
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add the number of leap years (days?) since year 1
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(not including this year as that is covered later)
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add the day number within the year
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this compensates for the non-inclusive leap year
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calculation
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if the day in question occurs before the gregorian reformation
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(3 sep 1752 for our purposes), then simply return
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(value so far - 1 + SATURDAY's value of 6) modulo 7.
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if the day in question occurs during the reformation (3 sep 1752
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to 13 sep 1752 inclusive) return THURSDAY. This is my
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idea of what happened then. It does not matter much as
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this program never tries to find day of week for any day
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that is not the first of a month.
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otherwise, after the reformation, use the same formula as the
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days before with the additional step of subtracting the
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number of days (11) that were adjusted out of the calendar
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just before taking the modulo.
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It must be noted that the number of leap years calculation is sensitive
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to the date for which the leap year is being calculated. A year that occurs
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before the reformation is determined to be a leap year if its modulo of
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4 equals zero. But after the reformation, a year is only a leap year if
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its modulo of 4 equals zero and its modulo of 100 does not. Of course,
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there is an exception for these century years. If the modulo of 400 equals
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zero, then the year is a leap year anyway. This is, in fact, what the
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gregorian reformation was all about (a bit of error in the old algorithm
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that caused the calendar to be inaccurate.)
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Once we have the day in year for the first of the month in question, the
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rest is trivial.
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@ -1,82 +0,0 @@
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.\" Copyright (c) 1989, 1990, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" Kim Letkeman.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)cal.1 8.2 (Berkeley) 4/28/95
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.\"
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.Dd April 28, 1995
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.Dt CAL 1
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.Os
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.Sh NAME
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.Nm cal
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.Nd displays a calendar
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.Sh SYNOPSIS
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.Nm cal
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.Op Fl jy
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.Op Oo Ar month Oc Ar \ year
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.Sh DESCRIPTION
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.Nm Cal
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displays a simple calendar.
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If arguments are not specified,
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the current month is displayed.
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl j
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Display julian dates (days one-based, numbered from January 1).
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.It Fl y
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Display a calendar for the current year.
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.El
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.Pp
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A single parameter specifies the year (1 - 9999) to be displayed;
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note the year must be fully specified:
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.Dq Li cal 89
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will
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.Em not
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display a calendar for 1989.
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Two parameters denote the month (1 - 12) and year.
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If no parameters are specified, the current month's calendar is
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displayed.
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.Pp
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A year starts on Jan 1.
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.Pp
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The Gregorian Reformation is assumed to have occurred in 1752 after the 2nd
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of September.
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By this time, most countries had recognized the reformation (although a
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few did not recognize it until the early 1900's.)
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Eleven days following that date were eliminated by the reformation, so the
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calendar for that month is a bit unusual.
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.Sh HISTORY
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A
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.Nm
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command appeared in
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.At v6 .
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@ -1,441 +0,0 @@
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/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Kim Letkeman.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1989, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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static char sccsid[] = "@(#)cal.c 8.4 (Berkeley) 4/2/94";
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#endif /* not lint */
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#include <sys/types.h>
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#include <ctype.h>
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#include <err.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#define THURSDAY 4 /* for reformation */
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#define SATURDAY 6 /* 1 Jan 1 was a Saturday */
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#define FIRST_MISSING_DAY 639787 /* 3 Sep 1752 */
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#define NUMBER_MISSING_DAYS 11 /* 11 day correction */
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#define MAXDAYS 42 /* max slots in a month array */
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#define SPACE -1 /* used in day array */
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static int days_in_month[2][13] = {
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{0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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{0, 31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31},
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};
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int sep1752[MAXDAYS] = {
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SPACE, SPACE, 1, 2, 14, 15, 16,
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17, 18, 19, 20, 21, 22, 23,
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24, 25, 26, 27, 28, 29, 30,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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}, j_sep1752[MAXDAYS] = {
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SPACE, SPACE, 245, 246, 258, 259, 260,
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261, 262, 263, 264, 265, 266, 267,
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268, 269, 270, 271, 272, 273, 274,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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}, empty[MAXDAYS] = {
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
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};
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char *month_names[12];
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char day_headings[] = " ";
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char j_day_headings[] = " ";
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/* leap year -- account for gregorian reformation in 1752 */
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#define leap_year(yr) \
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((yr) <= 1752 ? !((yr) % 4) : \
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!((yr) % 4) && ((yr) % 100) || !((yr) % 400))
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/* number of centuries since 1700, not inclusive */
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#define centuries_since_1700(yr) \
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((yr) > 1700 ? (yr) / 100 - 17 : 0)
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/* number of centuries since 1700 whose modulo of 400 is 0 */
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#define quad_centuries_since_1700(yr) \
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((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
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/* number of leap years between year 1 and this year, not inclusive */
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#define leap_years_since_year_1(yr) \
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((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
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int julian;
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void ascii_day __P((char *, int));
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void center __P((char *, int, int));
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void day_array __P((int, int, int *));
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int day_in_week __P((int, int, int));
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int day_in_year __P((int, int, int));
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void j_yearly __P((int));
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void monthly __P((int, int));
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void trim_trailing_spaces __P((char *));
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void usage __P((void));
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void yearly __P((int));
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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struct tm *local_time;
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static struct tm zero_tm;
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time_t now;
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int ch, month, year, yflag, i;
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char buf[40];
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(void) setlocale(LC_TIME, "");
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yflag = 0;
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while ((ch = getopt(argc, argv, "jy")) != -1)
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switch(ch) {
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case 'j':
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julian = 1;
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break;
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case 'y':
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yflag = 1;
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break;
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case '?':
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default:
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usage();
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}
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argc -= optind;
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argv += optind;
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month = 0;
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switch(argc) {
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case 2:
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if ((month = atoi(*argv++)) < 1 || month > 12)
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errx(1, "illegal month value: use 1-12");
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/* FALLTHROUGH */
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case 1:
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if ((year = atoi(*argv)) < 1 || year > 9999)
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errx(1, "illegal year value: use 1-9999");
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break;
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case 0:
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(void)time(&now);
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local_time = localtime(&now);
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year = local_time->tm_year + 1900;
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if (!yflag)
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month = local_time->tm_mon + 1;
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break;
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default:
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usage();
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}
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for (i = 0; i < 12; i++) {
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zero_tm.tm_mon = i;
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strftime(buf, sizeof(buf), "%B", &zero_tm);
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month_names[i] = strdup(buf);
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}
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for (i = 0; i < 7; i++) {
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zero_tm.tm_wday = i;
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strftime(buf, sizeof(buf), "%a", &zero_tm);
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strncpy(day_headings + i * 3, buf, 2);
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strncpy(j_day_headings + i * 4 + 1, buf, 2);
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}
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if (month)
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monthly(month, year);
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else if (julian)
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j_yearly(year);
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else
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yearly(year);
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exit(0);
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}
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#define DAY_LEN 3 /* 3 spaces per day */
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#define J_DAY_LEN 4 /* 4 spaces per day */
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#define WEEK_LEN 20 /* 7 * 3 - one space at the end */
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#define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */
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#define HEAD_SEP 2 /* spaces between day headings */
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#define J_HEAD_SEP 2
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void
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monthly(month, year)
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int month, year;
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{
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int col, row, len, days[MAXDAYS];
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char *p, lineout[30];
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day_array(month, year, days);
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len = sprintf(lineout, "%s %d", month_names[month - 1], year);
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(void)printf("%*s%s\n%s\n",
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((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
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lineout, julian ? j_day_headings : day_headings);
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for (row = 0; row < 6; row++) {
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for (col = 0, p = lineout; col < 7; col++,
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p += julian ? J_DAY_LEN : DAY_LEN)
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ascii_day(p, days[row * 7 + col]);
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*p = '\0';
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trim_trailing_spaces(lineout);
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(void)printf("%s\n", lineout);
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}
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}
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void
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j_yearly(year)
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int year;
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{
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int col, *dp, i, month, row, which_cal;
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int days[12][MAXDAYS];
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char *p, lineout[80];
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(void)sprintf(lineout, "%d", year);
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center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
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(void)printf("\n\n");
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for (i = 0; i < 12; i++)
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day_array(i + 1, year, days[i]);
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(void)memset(lineout, ' ', sizeof(lineout) - 1);
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lineout[sizeof(lineout) - 1] = '\0';
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for (month = 0; month < 12; month += 2) {
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center(month_names[month], J_WEEK_LEN, J_HEAD_SEP);
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center(month_names[month + 1], J_WEEK_LEN, 0);
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(void)printf("\n%s%*s%s\n", j_day_headings, J_HEAD_SEP, "",
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j_day_headings);
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for (row = 0; row < 6; row++) {
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for (which_cal = 0; which_cal < 2; which_cal++) {
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p = lineout + which_cal * (J_WEEK_LEN + 2);
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dp = &days[month + which_cal][row * 7];
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for (col = 0; col < 7; col++, p += J_DAY_LEN)
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ascii_day(p, *dp++);
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}
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*p = '\0';
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trim_trailing_spaces(lineout);
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(void)printf("%s\n", lineout);
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}
|
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}
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(void)printf("\n");
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}
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void
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yearly(year)
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int year;
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{
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int col, *dp, i, month, row, which_cal;
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int days[12][MAXDAYS];
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char *p, lineout[80];
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(void)sprintf(lineout, "%d", year);
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center(lineout, WEEK_LEN * 3 + HEAD_SEP * 2, 0);
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(void)printf("\n\n");
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for (i = 0; i < 12; i++)
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day_array(i + 1, year, days[i]);
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(void)memset(lineout, ' ', sizeof(lineout) - 1);
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lineout[sizeof(lineout) - 1] = '\0';
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for (month = 0; month < 12; month += 3) {
|
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center(month_names[month], WEEK_LEN, HEAD_SEP);
|
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center(month_names[month + 1], WEEK_LEN, HEAD_SEP);
|
||||
center(month_names[month + 2], WEEK_LEN, 0);
|
||||
(void)printf("\n%s%*s%s%*s%s\n", day_headings, HEAD_SEP,
|
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"", day_headings, HEAD_SEP, "", day_headings);
|
||||
for (row = 0; row < 6; row++) {
|
||||
for (which_cal = 0; which_cal < 3; which_cal++) {
|
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p = lineout + which_cal * (WEEK_LEN + 2);
|
||||
dp = &days[month + which_cal][row * 7];
|
||||
for (col = 0; col < 7; col++, p += DAY_LEN)
|
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ascii_day(p, *dp++);
|
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}
|
||||
*p = '\0';
|
||||
trim_trailing_spaces(lineout);
|
||||
(void)printf("%s\n", lineout);
|
||||
}
|
||||
}
|
||||
(void)printf("\n");
|
||||
}
|
||||
|
||||
/*
|
||||
* day_array --
|
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* Fill in an array of 42 integers with a calendar. Assume for a moment
|
||||
* that you took the (maximum) 6 rows in a calendar and stretched them
|
||||
* out end to end. You would have 42 numbers or spaces. This routine
|
||||
* builds that array for any month from Jan. 1 through Dec. 9999.
|
||||
*/
|
||||
void
|
||||
day_array(month, year, days)
|
||||
int month, year;
|
||||
int *days;
|
||||
{
|
||||
int day, dw, dm;
|
||||
|
||||
if (month == 9 && year == 1752) {
|
||||
memmove(days,
|
||||
julian ? j_sep1752 : sep1752, MAXDAYS * sizeof(int));
|
||||
return;
|
||||
}
|
||||
memmove(days, empty, MAXDAYS * sizeof(int));
|
||||
dm = days_in_month[leap_year(year)][month];
|
||||
dw = day_in_week(1, month, year);
|
||||
day = julian ? day_in_year(1, month, year) : 1;
|
||||
while (dm--)
|
||||
days[dw++] = day++;
|
||||
}
|
||||
|
||||
/*
|
||||
* day_in_year --
|
||||
* return the 1 based day number within the year
|
||||
*/
|
||||
int
|
||||
day_in_year(day, month, year)
|
||||
int day, month, 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. Returns Thursday for all
|
||||
* missing days.
|
||||
*/
|
||||
int
|
||||
day_in_week(day, month, year)
|
||||
int day, month, year;
|
||||
{
|
||||
long temp;
|
||||
|
||||
temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
|
||||
+ day_in_year(day, month, year);
|
||||
if (temp < FIRST_MISSING_DAY)
|
||||
return ((temp - 1 + SATURDAY) % 7);
|
||||
if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
|
||||
return (((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
|
||||
return (THURSDAY);
|
||||
}
|
||||
|
||||
void
|
||||
ascii_day(p, day)
|
||||
char *p;
|
||||
int day;
|
||||
{
|
||||
int display, val;
|
||||
static char *aday[] = {
|
||||
"",
|
||||
" 1", " 2", " 3", " 4", " 5", " 6", " 7",
|
||||
" 8", " 9", "10", "11", "12", "13", "14",
|
||||
"15", "16", "17", "18", "19", "20", "21",
|
||||
"22", "23", "24", "25", "26", "27", "28",
|
||||
"29", "30", "31",
|
||||
};
|
||||
|
||||
if (day == SPACE) {
|
||||
memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
|
||||
return;
|
||||
}
|
||||
if (julian) {
|
||||
if (val = day / 100) {
|
||||
day %= 100;
|
||||
*p++ = val + '0';
|
||||
display = 1;
|
||||
} else {
|
||||
*p++ = ' ';
|
||||
display = 0;
|
||||
}
|
||||
val = day / 10;
|
||||
if (val || display)
|
||||
*p++ = val + '0';
|
||||
else
|
||||
*p++ = ' ';
|
||||
*p++ = day % 10 + '0';
|
||||
} else {
|
||||
*p++ = aday[day][0];
|
||||
*p++ = aday[day][1];
|
||||
}
|
||||
*p = ' ';
|
||||
}
|
||||
|
||||
void
|
||||
trim_trailing_spaces(s)
|
||||
char *s;
|
||||
{
|
||||
char *p;
|
||||
|
||||
for (p = s; *p; ++p)
|
||||
continue;
|
||||
while (p > s && isspace(*--p))
|
||||
continue;
|
||||
if (p > s)
|
||||
++p;
|
||||
*p = '\0';
|
||||
}
|
||||
|
||||
void
|
||||
center(str, len, separate)
|
||||
char *str;
|
||||
int len;
|
||||
int separate;
|
||||
{
|
||||
|
||||
len -= strlen(str);
|
||||
(void)printf("%*s%s%*s", len / 2, "", str, len / 2 + len % 2, "");
|
||||
if (separate)
|
||||
(void)printf("%*s", separate, "");
|
||||
}
|
||||
|
||||
void
|
||||
usage()
|
||||
{
|
||||
|
||||
(void)fprintf(stderr, "usage: cal [-jy] [[month] year]\n");
|
||||
exit(1);
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user