/* $OpenBSD: cal.c,v 1.21 2006/10/29 22:51:09 tom Exp $ */ /* $NetBSD: cal.c,v 1.6 1995/03/26 03:10:24 glass Exp $ */ /* * 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. 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 const char copyright[] = "@(#) Copyright (c) 1989, 1993, 1994\n\ The Regents of the University of California. All rights reserved.\n"; #if 0 static char sccsid[] = "@(#)cal.c 8.4 (Berkeley) 4/2/94"; #else static const char rcsid[] = "$OpenBSD: cal.c,v 1.21 2006/10/29 22:51:09 tom Exp $"; #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #define THURSDAY 4 /* for reformation */ #define SATURDAY 6 /* 1 Jan 1 was a Saturday */ #define FIRST_MISSING_DAY 639799 /* 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 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}, }; const 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, }; const char *month_names[12] = { "January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December", }; const char *day_headings = "Su Mo Tu We Th Fr Sa"; const char *j_day_headings = " Su Mo Tu We Th Fr Sa"; /* 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(char *, int); void center(const char *, int, int); void day_array(int, int, int *); int day_in_week(int, int, int); int day_in_year(int, int, int); void j_yearly(int); void monthly(int, int); void trim_trailing_spaces(char *); void usage(void); void yearly(int); int parsemonth(const char *); int main(int argc, char *argv[]) { struct tm *local_time; time_t now; int ch, month, year, yflag; const char *errstr; yflag = year = 0; while ((ch = getopt(argc, argv, "jy")) != -1) 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: month = parsemonth(*argv++); if (!month) errx(1, "Unable to parse month"); /* FALLTHROUGH */ case 1: if (argc == 1 && !isdigit(*argv[0])) { month = parsemonth(*argv); if (!month) errx(1, "illegal year value: use 1-9999"); (void)time(&now); local_time = localtime(&now); year = local_time->tm_year + TM_YEAR_BASE; } else { year = strtonum(*argv, 1, 9999, &errstr); if (errstr) errx(1, "illegal year value: use 1-9999"); } break; case 0: (void)time(&now); local_time = localtime(&now); year = local_time->tm_year + TM_YEAR_BASE; 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 20 /* 7 * 3 - one space at the end */ #define J_WEEK_LEN 27 /* 7 * 4 - one space at the end */ #define HEAD_SEP 2 /* spaces between day headings */ #define J_HEAD_SEP 2 void monthly(int month, int year) { int col, row, len, days[MAXDAYS]; char *p, lineout[30]; day_array(month, year, days); (void)snprintf(lineout, sizeof(lineout), "%s %d", month_names[month - 1], year); len = strlen(lineout); (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(int year) { int col, *dp, i, month, row, which_cal; int days[12][MAXDAYS]; char *p, lineout[80]; (void)snprintf(lineout, sizeof(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(month_names[month], J_WEEK_LEN, J_HEAD_SEP); center(month_names[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(int year) { int col, *dp, i, month, row, which_cal; int days[12][MAXDAYS]; char *p, lineout[80]; (void)snprintf(lineout, sizeof(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(month_names[month], WEEK_LEN, HEAD_SEP); 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, "", 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(int month, int 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(int day, int month, int 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(int day, int month, int 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(char *p, int day) { int display, val; static const 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) { val = day / 100; if (val) { 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(char *s) { char *p; for (p = s; *p; ++p) continue; while (p > s && isspace(*--p)) continue; if (p > s) ++p; *p = '\0'; } void center(const char *str, int len, int separate) { len -= strlen(str); (void)printf("%*s%s%*s", len / 2, "", str, len / 2 + len % 2 + separate, ""); } void usage(void) { (void)fprintf(stderr, "usage: cal [-jy] [month] [year]\n"); exit(1); } int parsemonth(const char *s) { struct tm tm; char *cp; int v; v = (int)strtol(s, &cp, 10); if (*cp != '\0') { /* s wasn't purely numeric */ v = 0; if ((cp = strptime(s, "%b", &tm)) != NULL && *cp == '\0') v = tm.tm_mon + 1; } if (v <= 0 || v > 12) errx(1, "invalid month: use 1-12 or a name"); return (v); }