408 lines
11 KiB
C
408 lines
11 KiB
C
/*
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* Copyright (c) 1989 The Regents of the University of California.
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* 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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char copyright[] =
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"@(#) Copyright (c) 1989 The Regents of the University of California.\n\
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All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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/*static char sccsid[] = "from: @(#)cal.c 5.2 (Berkeley) 4/19/91";*/
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static char rcsid[] = "$Id: cal.c,v 1.2 1993/08/01 18:18:17 mycroft Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <ctype.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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"January", "February", "March", "April", "May", "June",
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"July", "August", "September", "October", "November", "December",
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};
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char *day_headings = " S M Tu W Th F S";
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char *j_day_headings = " S M Tu W Th F S";
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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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main(argc, argv)
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int argc;
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char **argv;
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{
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extern char *optarg;
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extern int optind;
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struct tm *local_time;
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time_t now, time();
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int ch, month, year, yflag;
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yflag = 0;
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while ((ch = getopt(argc, argv, "jy")) != EOF)
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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++)) <= 0 || month > 12) {
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(void)fprintf(stderr,
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"cal: illegal month value: use 0-12\n");
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exit(1);
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}
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/* FALLTHROUGH */
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case 1:
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if ((year = atoi(*argv)) <= 0 || year > 9999) {
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(void)fprintf(stderr,
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"cal: illegal year value: use 0-9999\n");
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exit(1);
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}
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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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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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monthly(month, year)
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int month, year;
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{
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register int col, row;
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register char *p;
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int len, days[MAXDAYS];
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char 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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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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j_yearly(year)
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int year;
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{
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register int col, *dp, i, month, row, which_cal;
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register char *p;
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int days[12][MAXDAYS];
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char 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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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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yearly(year)
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int year;
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{
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register int col, *dp, i, month, row, which_cal;
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register char *p;
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int days[12][MAXDAYS];
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char 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);
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center(month_names[month + 2], WEEK_LEN, 0);
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(void)printf("\n%s%*s%s%*s%s\n", day_headings, HEAD_SEP,
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"", day_headings, HEAD_SEP, "", day_headings);
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for (row = 0; row < 6; row++) {
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for (which_cal = 0; which_cal < 3; which_cal++) {
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p = lineout + which_cal * (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 += DAY_LEN)
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ascii_day(p, *dp++);
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}
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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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/*
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* day_array --
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* Fill in an array of 42 integers with a calendar. Assume for a moment
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* that you took the (maximum) 6 rows in a calendar and stretched them
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* out end to end. You would have 42 numbers or spaces. This routine
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* builds that array for any month from Jan. 1 through Dec. 9999.
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*/
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day_array(month, year, days)
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register int *days;
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int month, year;
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{
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register int i, day, dw, dm;
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if (month == 9 && year == 1752) {
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bcopy(julian ? j_sep1752 : sep1752,
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days, MAXDAYS * sizeof(int));
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return;
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}
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bcopy(empty, days, MAXDAYS * sizeof(int));
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dm = days_in_month[leap_year(year)][month];
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dw = day_in_week(1, month, year);
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day = julian ? day_in_year(1, month, year) : 1;
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while (dm--)
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days[dw++] = day++;
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}
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/*
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* day_in_year --
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* return the 1 based day number within the year
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*/
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day_in_year(day, month, year)
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register int day, month;
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int year;
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{
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register int i, leap;
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leap = leap_year(year);
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for (i = 1; i < month; i++)
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day += days_in_month[leap][i];
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return(day);
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}
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/*
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* day_in_week
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* return the 0 based day number for any date from 1 Jan. 1 to
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* 31 Dec. 9999. Assumes the Gregorian reformation eliminates
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* 3 Sep. 1752 through 13 Sep. 1752. Returns Thursday for all
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* missing days.
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*/
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day_in_week(day, month, year)
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int day, month, year;
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{
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long temp;
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temp = (long)(year - 1) * 365 + leap_years_since_year_1(year - 1)
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+ day_in_year(day, month, year);
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if (temp < FIRST_MISSING_DAY)
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return((temp - 1 + SATURDAY) % 7);
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if (temp >= (FIRST_MISSING_DAY + NUMBER_MISSING_DAYS))
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return(((temp - 1 + SATURDAY) - NUMBER_MISSING_DAYS) % 7);
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return(THURSDAY);
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}
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ascii_day(p, day)
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register char *p;
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register int day;
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{
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register int display, val;
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static char *aday[] = {
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"",
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" 1", " 2", " 3", " 4", " 5", " 6", " 7",
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" 8", " 9", "10", "11", "12", "13", "14",
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"15", "16", "17", "18", "19", "20", "21",
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"22", "23", "24", "25", "26", "27", "28",
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"29", "30", "31",
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};
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if (day == SPACE) {
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memset(p, ' ', julian ? J_DAY_LEN : DAY_LEN);
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return;
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}
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if (julian) {
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if (val = day / 100) {
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day %= 100;
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*p++ = val + '0';
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display = 1;
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} else {
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*p++ = ' ';
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display = 0;
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}
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val = day / 10;
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if (val || display)
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*p++ = val + '0';
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else
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*p++ = ' ';
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*p++ = day % 10 + '0';
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} else {
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*p++ = aday[day][0];
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*p++ = aday[day][1];
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}
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*p = ' ';
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}
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trim_trailing_spaces(s)
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register char *s;
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{
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register char *p;
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for (p = s; *p; ++p);
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while (p > s && isspace(*--p));
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if (p > s)
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++p;
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*p = '\0';
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}
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center(str, len, separate)
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char *str;
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register int len;
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int separate;
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{
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len -= strlen(str);
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(void)printf("%*s%s%*s", len / 2, "", str, len / 2 + len % 2, "");
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if (separate)
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(void)printf("%*s", separate, "");
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}
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usage()
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{
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(void)fprintf(stderr, "usage: cal [-jy] [[month] year]\n");
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exit(1);
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}
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