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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.
- */
-
- #ifndef lint
- static char copyright[] =
- "@(#) Copyright (c) 1989, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)cal.c 8.4 (Berkeley) 4/2/94";
- #endif /* not lint */
-
- #include <sys/types.h>
-
- #include <ctype.h>
- #include <err.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <unistd.h>
- #include <locale.h>
- #include <localeinfo.h>
-
- #define THURSDAY 4 /* for reformation */
- #define SATURDAY 6 /* 1 Jan 1 was a Saturday */
-
- #define FIRST_MISSING_DAY 639787 /* 3 Sep 1752 */
- #define NUMBER_MISSING_DAYS 11 /* 11 day correction */
-
- #define MAXDAYS 42 /* max slots in a month array */
- #define SPACE -1 /* used in day array */
-
- static 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},
- };
-
- int sep1752[MAXDAYS] = {
- SPACE, SPACE, 1, 2, 14, 15, 16,
- 17, 18, 19, 20, 21, 22, 23,
- 24, 25, 26, 27, 28, 29, 30,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- }, j_sep1752[MAXDAYS] = {
- SPACE, SPACE, 245, 246, 258, 259, 260,
- 261, 262, 263, 264, 265, 266, 267,
- 268, 269, 270, 271, 272, 273, 274,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- }, empty[MAXDAYS] = {
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- SPACE, SPACE, SPACE, SPACE, SPACE, SPACE, SPACE,
- };
-
- char *day_headings = " S M Tu W Th F S ";
- char *j_day_headings = " S M Tu W Th F S ";
-
- /* leap year -- account for gregorian reformation in 1752 */
- #define leap_year(yr) \
- ((yr) <= 1752 ? !((yr) % 4) : \
- !((yr) % 4) && ((yr) % 100) || !((yr) % 400))
-
- /* number of centuries since 1700, not inclusive */
- #define centuries_since_1700(yr) \
- ((yr) > 1700 ? (yr) / 100 - 17 : 0)
-
- /* number of centuries since 1700 whose modulo of 400 is 0 */
- #define quad_centuries_since_1700(yr) \
- ((yr) > 1600 ? ((yr) - 1600) / 400 : 0)
-
- /* number of leap years between year 1 and this year, not inclusive */
- #define leap_years_since_year_1(yr) \
- ((yr) / 4 - centuries_since_1700(yr) + quad_centuries_since_1700(yr))
-
- int julian;
-
- void ascii_day __P((char *, int));
- void center __P((char *, int, int));
- void day_array __P((int, int, int *));
- int day_in_week __P((int, int, int));
- int day_in_year __P((int, int, int));
- void j_yearly __P((int));
- void monthly __P((int, int));
- void trim_trailing_spaces __P((char *));
- void usage __P((void));
- void yearly __P((int));
- void headers_init(void);
-
- int
- main(argc, argv)
- int argc;
- char **argv;
- {
- struct tm *local_time;
- time_t now;
- int ch, month, year, yflag;
-
- #ifdef __linux__
- extern char *__progname;
- __progname = argv[0];
- #endif
-
- setlocale(LC_ALL,"");
- headers_init();
- yflag = 0;
- while ((ch = getopt(argc, argv, "jy")) != EOF)
- switch(ch) {
- case 'j':
- julian = 1;
- break;
- case 'y':
- yflag = 1;
- break;
- case '?':
- default:
- usage();
- }
- argc -= optind;
- argv += optind;
-
- month = 0;
- switch(argc) {
- case 2:
- if ((month = atoi(*argv++)) < 1 || month > 12)
- errx(1, "illegal month value: use 1-12");
- /* FALLTHROUGH */
- case 1:
- if ((year = atoi(*argv)) < 1 || year > 9999)
- errx(1, "illegal year value: use 1-9999");
- break;
- case 0:
- (void)time(&now);
- local_time = localtime(&now);
- year = local_time->tm_year + 1900;
- if (!yflag)
- month = local_time->tm_mon + 1;
- break;
- default:
- usage();
- }
-
- if (month)
- monthly(month, year);
- else if (julian)
- j_yearly(year);
- else
- yearly(year);
- exit(0);
- }
-
- #define DAY_LEN 3 /* 3 spaces per day */
- #define J_DAY_LEN 4 /* 4 spaces per day */
- #define WEEK_LEN 21 /* 7 days * 3 characters */
- #define J_WEEK_LEN 28 /* 7 days * 4 characters */
- #define HEAD_SEP 2 /* spaces between day headings */
- #define J_HEAD_SEP 2
-
- void headers_init(void)
- {
- int i;
-
- strcpy(day_headings,"");
- for(i = 0 ; i < 7 ; i++ )
- {
- strncat(day_headings,_time_info->abbrev_wkday[i],2);
- strcat(day_headings," ");
- }
- strcpy(j_day_headings,"");
- for(i = 0 ; i < 7 ; i++ )
- {
- strcat(j_day_headings,_time_info->abbrev_wkday[i]);
- strcat(j_day_headings," ");
- }
- }
-
- void
- monthly(month, year)
- int month, year;
- {
- int col, row, len, days[MAXDAYS];
- char *p, lineout[30];
-
- day_array(month, year, days);
- len = sprintf(lineout, "%s %d", _time_info->full_month[month - 1], year);
- (void)printf("%*s%s\n%s\n",
- ((julian ? J_WEEK_LEN : WEEK_LEN) - len) / 2, "",
- lineout, julian ? j_day_headings : day_headings);
- for (row = 0; row < 6; row++) {
- for (col = 0, p = lineout; col < 7; col++,
- p += julian ? J_DAY_LEN : DAY_LEN)
- ascii_day(p, days[row * 7 + col]);
- *p = '\0';
- trim_trailing_spaces(lineout);
- (void)printf("%s\n", lineout);
- }
- }
-
- void
- j_yearly(year)
- int year;
- {
- int col, *dp, i, month, row, which_cal;
- int days[12][MAXDAYS];
- char *p, lineout[80];
-
- (void)sprintf(lineout, "%d", year);
- center(lineout, J_WEEK_LEN * 2 + J_HEAD_SEP, 0);
- (void)printf("\n\n");
- for (i = 0; i < 12; i++)
- day_array(i + 1, year, days[i]);
- (void)memset(lineout, ' ', sizeof(lineout) - 1);
- lineout[sizeof(lineout) - 1] = '\0';
- for (month = 0; month < 12; month += 2) {
- center(_time_info->full_month[month], J_WEEK_LEN, J_HEAD_SEP);
- center(_time_info->full_month[month + 1], J_WEEK_LEN, 0);
- (void)printf("\n%s%*s%s\n", j_day_headings, J_HEAD_SEP, "",
- j_day_headings);
- for (row = 0; row < 6; row++) {
- for (which_cal = 0; which_cal < 2; which_cal++) {
- p = lineout + which_cal * (J_WEEK_LEN + 2);
- dp = &days[month + which_cal][row * 7];
- for (col = 0; col < 7; col++, p += J_DAY_LEN)
- ascii_day(p, *dp++);
- }
- *p = '\0';
- trim_trailing_spaces(lineout);
- (void)printf("%s\n", lineout);
- }
- }
- (void)printf("\n");
- }
-
- void
- yearly(year)
- int year;
- {
- int col, *dp, i, month, row, which_cal;
- int days[12][MAXDAYS];
- char *p, lineout[80];
-
- (void)sprintf(lineout, "%d", year);
- center(lineout, WEEK_LEN * 3 + HEAD_SEP * 2, 0);
- (void)printf("\n\n");
- for (i = 0; i < 12; i++)
- day_array(i + 1, year, days[i]);
- (void)memset(lineout, ' ', sizeof(lineout) - 1);
- lineout[sizeof(lineout) - 1] = '\0';
- for (month = 0; month < 12; month += 3) {
- center(_time_info->full_month[month], WEEK_LEN, HEAD_SEP);
- center(_time_info->full_month[month + 1], WEEK_LEN, HEAD_SEP);
- center(_time_info->full_month[month + 2], WEEK_LEN, 0);
- (void)printf("\n%s%*s%s%*s%s\n", day_headings, HEAD_SEP,
- "", day_headings, HEAD_SEP, "", day_headings);
- for (row = 0; row < 6; row++) {
- for (which_cal = 0; which_cal < 3; which_cal++) {
- p = lineout + which_cal * (WEEK_LEN + 2);
- dp = &days[month + which_cal][row * 7];
- for (col = 0; col < 7; col++, p += DAY_LEN)
- ascii_day(p, *dp++);
- }
- *p = '\0';
- trim_trailing_spaces(lineout);
- (void)printf("%s\n", lineout);
- }
- }
- (void)printf("\n");
- }
-
- /*
- * day_array --
- * 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);
- }
-