471 lines
11 KiB
C
471 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 <ctype.h>
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#include <locale.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/types.h>
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#include <time.h>
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#include <sys/uio.h>
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#include <string.h>
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#include <stdlib.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 *days[] = {
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"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
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};
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static 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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ndays[i].name = strdup(buf);
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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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fndays[i].name = strdup(buf);
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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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nmonths[i].name = strdup(buf);
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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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fnmonths[i].name = strdup(buf);
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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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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 == 5 ? 3 : 1;
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header[5].iov_base = dayname;
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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, "");
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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 (date)
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char *date;
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{
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time_t t;
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int len;
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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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len = strlen(date);
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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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/* day */
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*(date+2) = NULL;
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tm.tm_mday = atoi(date);
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/* month */
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if (len >= 4) {
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*(date+5) = NULL;
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tm.tm_mon = atoi(date+3) - 1;
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}
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/* Year */
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if (len >= 7) {
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tm.tm_year = atoi(date+6);
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/* tm_year up 1900 ... */
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if (tm.tm_year > 1900)
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tm.tm_year -= 1900;
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}
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#if DEBUG
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printf("Mktime: %d %d %d %s\n", (int)mktime(&tm), (int)t, len,
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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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* 'SunayLast' -> ??
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*/
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if (flags & F_ISDAY) {
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#if 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 '22th' */
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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 (((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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}
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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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}
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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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#if DEBUG
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fprintf(stderr, "day2: day %d(%d) yday %d\n", *dayp, day, 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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register char *s;
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{
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register 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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register char *s;
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{
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register 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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register char *s;
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{
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register int offset;
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offset = strlen(s);
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/* Sun+1 or Wednesday-2
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* ^ ^ */
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/* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
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switch(*(s + offset - 2)) {
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case '-':
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return(-(atoi(s + offset - 1)));
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break;
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case '+':
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return(atoi(s + offset - 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 (offset > 4 && !strcasecmp(s + offset - 4, "last"))
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return(-1);
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else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
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return(+1);
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else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
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return(+2);
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else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
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return(+3);
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else if (offset > 6 && !strcasecmp(s + offset - 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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