b20a21a6c1
-W is like -A (number of days in the future to consider, but also specifies that we don't want special treatment at weekends. -F changes our notion of "Friday" (the day before the weekend). Arguably, calendar(1) is broken to have special treatment of weekends by default, but this method maintains POLA.
484 lines
11 KiB
C
484 lines
11 KiB
C
/*
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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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* 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/uio.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 "pathnames.h"
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#include "calendar.h"
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struct tm *tp;
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int *cumdays, offset, yrdays;
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char dayname[10];
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/* 1-based month, 0-based days, cumulative */
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int daytab[][14] = {
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{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
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{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
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};
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static char const *days[] = {
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"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
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};
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static const char *months[] = {
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"jan", "feb", "mar", "apr", "may", "jun",
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"jul", "aug", "sep", "oct", "nov", "dec", NULL,
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};
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static struct fixs fndays[8]; /* full national days names */
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static struct fixs ndays[8]; /* short national days names */
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static struct fixs fnmonths[13]; /* full national months names */
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static struct fixs nmonths[13]; /* short national month names */
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void setnnames(void)
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{
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char buf[80];
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int i, l;
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struct tm tm;
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for (i = 0; i < 7; i++) {
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tm.tm_wday = i;
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strftime(buf, sizeof(buf), "%a", &tm);
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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (ndays[i].name != NULL)
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free(ndays[i].name);
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if ((ndays[i].name = strdup(buf)) == NULL)
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errx(1, "cannot allocate memory");
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ndays[i].len = strlen(buf);
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strftime(buf, sizeof(buf), "%A", &tm);
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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (fndays[i].name != NULL)
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free(fndays[i].name);
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if ((fndays[i].name = strdup(buf)) == NULL)
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errx(1, "cannot allocate memory");
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fndays[i].len = strlen(buf);
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}
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for (i = 0; i < 12; i++) {
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tm.tm_mon = i;
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strftime(buf, sizeof(buf), "%b", &tm);
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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (nmonths[i].name != NULL)
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free(nmonths[i].name);
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if ((nmonths[i].name = strdup(buf)) == NULL)
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errx(1, "cannot allocate memory");
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nmonths[i].len = strlen(buf);
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strftime(buf, sizeof(buf), "%B", &tm);
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for (l = strlen(buf);
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l > 0 && isspace((unsigned char)buf[l - 1]);
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l--)
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;
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buf[l] = '\0';
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if (fnmonths[i].name != NULL)
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free(fnmonths[i].name);
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if ((fnmonths[i].name = strdup(buf)) == NULL)
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errx(1, "cannot allocate memory");
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fnmonths[i].len = strlen(buf);
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}
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}
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void
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settime(now)
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time_t now;
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{
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char *oldl, *lbufp;
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tp = localtime(&now);
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if ( isleap(tp->tm_year + 1900) ) {
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yrdays = 366;
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cumdays = daytab[1];
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} else {
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yrdays = 365;
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cumdays = daytab[0];
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}
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/* Friday displays Monday's events */
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offset = tp->tm_wday == Friday ? 3 : 1;
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header[5].iov_base = dayname;
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oldl = NULL;
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lbufp = setlocale(LC_TIME, NULL);
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if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
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errx(1, "cannot allocate memory");
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(void) setlocale(LC_TIME, "C");
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header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
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(void) setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
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if (oldl != NULL)
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free(oldl);
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setnnames();
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}
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/* convert Day[/Month][/Year] into unix time (since 1970)
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* Day: two digits, Month: two digits, Year: digits
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*/
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time_t Mktime (dp)
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char *dp;
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{
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time_t t;
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int d, m, y;
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struct tm tm;
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(void)time(&t);
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tp = localtime(&t);
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tm.tm_sec = 0;
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tm.tm_min = 0;
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tm.tm_hour = 0;
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tm.tm_wday = 0;
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tm.tm_mday = tp->tm_mday;
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tm.tm_mon = tp->tm_mon;
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tm.tm_year = tp->tm_year;
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switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
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case 3:
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if (y > 1900)
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y -= 1900;
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tm.tm_year = y;
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/* FALLTHROUGH */
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case 2:
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tm.tm_mon = m - 1;
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/* FALLTHROUGH */
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case 1:
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tm.tm_mday = d;
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}
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#ifdef DEBUG
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fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
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asctime(&tm));
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#endif
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return(mktime(&tm));
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}
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/*
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* Possible date formats include any combination of:
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* 3-charmonth (January, Jan, Jan)
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* 3-charweekday (Friday, Monday, mon.)
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* numeric month or day (1, 2, 04)
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*
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* Any character may separate them, or they may not be separated. Any line,
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* following a line that is matched, that starts with "whitespace", is shown
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* along with the matched line.
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*/
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int
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isnow(endp, monthp, dayp, varp)
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char *endp;
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int *monthp;
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int *dayp;
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int *varp;
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{
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int day, flags, month = 0, v1, v2;
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/*
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* CONVENTION
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*
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* Month: 1-12
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* Monthname: Jan .. Dec
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* Day: 1-31
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* Weekday: Mon-Sun
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*
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*/
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flags = 0;
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/* read first field */
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/* didn't recognize anything, skip it */
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if (!(v1 = getfield(endp, &endp, &flags)))
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return (0);
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/* Easter or Easter depending days */
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if (flags & F_EASTER)
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day = v1 - 1; /* days since January 1 [0-365] */
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/*
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* 1. {Weekday,Day} XYZ ...
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*
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* where Day is > 12
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*/
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else if (flags & F_ISDAY || v1 > 12) {
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/* found a day; day: 1-31 or weekday: 1-7 */
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day = v1;
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/* {Day,Weekday} {Month,Monthname} ... */
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/* if no recognizable month, assume just a day alone
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* in other words, find month or use current month */
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if (!(month = getfield(endp, &endp, &flags)))
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month = tp->tm_mon + 1;
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}
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/* 2. {Monthname} XYZ ... */
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else if (flags & F_ISMONTH) {
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month = v1;
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/* Monthname {day,weekday} */
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/* if no recognizable day, assume the first day in month */
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if (!(day = getfield(endp, &endp, &flags)))
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day = 1;
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}
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/* Hm ... */
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else {
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v2 = getfield(endp, &endp, &flags);
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/*
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* {Day} {Monthname} ...
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* where Day <= 12
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*/
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if (flags & F_ISMONTH) {
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day = v1;
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month = v2;
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*varp = 0;
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}
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/* {Month} {Weekday,Day} ... */
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else {
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/* F_ISDAY set, v2 > 12, or no way to tell */
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month = v1;
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/* if no recognizable day, assume the first */
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day = v2 ? v2 : 1;
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*varp = 0;
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}
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}
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/* convert Weekday into *next* Day,
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* e.g.: 'Sunday' -> 22
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* 'SundayLast' -> ??
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*/
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if (flags & F_ISDAY) {
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#ifdef DEBUG
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fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
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#endif
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*varp = 1;
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/* variable weekday, SundayLast, MondayFirst ... */
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if (day < 0 || day >= 10) {
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/* negative offset; last, -4 .. -1 */
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if (day < 0) {
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v1 = day/10 - 1; /* offset -4 ... -1 */
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day = 10 + (day % 10); /* day 1 ... 7 */
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/* day, eg '22nd' */
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v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
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/* (month length - day) / 7 + 1 */
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if (cumdays[month+1] - cumdays[month] >= v2
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&& ((int)((cumdays[month+1] -
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cumdays[month] - v2) / 7) + 1) == -v1)
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/* bingo ! */
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day = v2;
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/* set to yesterday */
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else {
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day = tp->tm_mday - 1;
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if (day == 0)
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return (0);
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}
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}
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/* first, second ... +1 ... +5 */
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else {
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v1 = day/10; /* offset: +1 (first Sunday) ... */
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day = day % 10;
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/* day, eg '22th' */
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v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
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/* Hurrah! matched */
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if ( ((v2 - 1 + 7) / 7) == v1 )
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day = v2;
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/* set to yesterday */
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else {
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day = tp->tm_mday - 1;
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if (day == 0)
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return (0);
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}
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}
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}
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/* wired */
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else {
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day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
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*varp = 1;
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}
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}
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if (!(flags & F_EASTER)) {
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*monthp = month;
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*dayp = day;
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day = cumdays[month] + day;
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}
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else {
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for (v1 = 0; day > cumdays[v1]; v1++)
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;
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*monthp = v1 - 1;
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*dayp = day - cumdays[v1 - 1];
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*varp = 1;
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}
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#ifdef DEBUG
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fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday);
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#endif
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/* if today or today + offset days */
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if (day >= tp->tm_yday - f_dayBefore &&
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day <= tp->tm_yday + offset + f_dayAfter)
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return (1);
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/* if number of days left in this year + days to event in next year */
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if (yrdays - tp->tm_yday + day <= offset + f_dayAfter ||
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/* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */
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tp->tm_yday + day - f_dayBefore < 0
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)
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return (1);
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return (0);
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}
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int
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getmonth(s)
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char *s;
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{
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const char **p;
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struct fixs *n;
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for (n = fnmonths; n->name; ++n)
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if (!strncasecmp(s, n->name, n->len))
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return ((n - fnmonths) + 1);
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for (n = nmonths; n->name; ++n)
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if (!strncasecmp(s, n->name, n->len))
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return ((n - nmonths) + 1);
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for (p = months; *p; ++p)
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if (!strncasecmp(s, *p, 3))
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return ((p - months) + 1);
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return (0);
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}
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int
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getday(s)
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char *s;
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{
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const char **p;
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struct fixs *n;
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for (n = fndays; n->name; ++n)
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if (!strncasecmp(s, n->name, n->len))
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return ((n - fndays) + 1);
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for (n = ndays; n->name; ++n)
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if (!strncasecmp(s, n->name, n->len))
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return ((n - ndays) + 1);
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for (p = days; *p; ++p)
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if (!strncasecmp(s, *p, 3))
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return ((p - days) + 1);
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return (0);
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}
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/* return offset for variable weekdays
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* -1 -> last weekday in month
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* +1 -> first weekday in month
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* ... etc ...
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*/
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int
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getdayvar(s)
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char *s;
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{
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int offs;
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offs = strlen(s);
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/* Sun+1 or Wednesday-2
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* ^ ^ */
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/* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
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switch(*(s + offs - 2)) {
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case '-':
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return(-(atoi(s + offs - 1)));
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break;
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case '+':
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return(atoi(s + offs - 1));
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break;
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}
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/*
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* some aliases: last, first, second, third, fourth
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*/
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/* last */
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if (offs > 4 && !strcasecmp(s + offs - 4, "last"))
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return(-1);
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else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
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return(+1);
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else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
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return(+2);
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else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
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return(+3);
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else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
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return(+4);
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/* no offset detected */
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return(0);
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}
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