OpenBSD-4.6/usr.bin/calendar/day.c
/* $OpenBSD: day.c,v 1.21 2008/04/13 00:22:17 djm Exp $ */
/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static const char sccsid[] = "@(#)calendar.c 8.3 (Berkeley) 3/25/94";
#else
static const char rcsid[] = "$OpenBSD: day.c,v 1.21 2008/04/13 00:22:17 djm Exp $";
#endif
#endif /* not lint */
#include <sys/types.h>
#include <sys/uio.h>
#include <ctype.h>
#include <err.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include "pathnames.h"
#include "calendar.h"
#define WEEKLY 1
#define MONTHLY 2
#define YEARLY 3
struct tm *tp;
int *cumdays, offset;
char dayname[10];
enum calendars calendar;
u_long julian;
/* 1-based month, 0-based days, cumulative */
int daytab[][14] = {
{ 0, -1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364 },
{ 0, -1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
};
static char *days[] = {
"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
};
static char *months[] = {
"jan", "feb", "mar", "apr", "may", "jun",
"jul", "aug", "sep", "oct", "nov", "dec", NULL,
};
static struct fixs fndays[8]; /* full national days names */
static struct fixs ndays[8]; /* short national days names */
static struct fixs fnmonths[13]; /* full national months names */
static struct fixs nmonths[13]; /* short national month names */
void
setnnames(void)
{
char buf[80];
int i, l;
struct tm tm;
for (i = 0; i < 7; i++) {
tm.tm_wday = i;
l = strftime(buf, sizeof(buf), "%a", &tm);
for (; l > 0 && isspace((int)buf[l - 1]); l--)
;
buf[l] = '\0';
if (ndays[i].name != NULL)
free(ndays[i].name);
if ((ndays[i].name = strdup(buf)) == NULL)
err(1, NULL);
ndays[i].len = strlen(buf);
l = strftime(buf, sizeof(buf), "%A", &tm);
for (; l > 0 && isspace((int)buf[l - 1]); l--)
;
buf[l] = '\0';
if (fndays[i].name != NULL)
free(fndays[i].name);
if ((fndays[i].name = strdup(buf)) == NULL)
err(1, NULL);
fndays[i].len = strlen(buf);
}
for (i = 0; i < 12; i++) {
tm.tm_mon = i;
l = strftime(buf, sizeof(buf), "%b", &tm);
for (; l > 0 && isspace((int)buf[l - 1]); l--)
;
buf[l] = '\0';
if (nmonths[i].name != NULL)
free(nmonths[i].name);
if ((nmonths[i].name = strdup(buf)) == NULL)
err(1, NULL);
nmonths[i].len = strlen(buf);
l = strftime(buf, sizeof(buf), "%B", &tm);
for (; l > 0 && isspace((int)buf[l - 1]); l--)
;
buf[l] = '\0';
if (fnmonths[i].name != NULL)
free(fnmonths[i].name);
if ((fnmonths[i].name = strdup(buf)) == NULL)
err(1, NULL);
fnmonths[i].len = strlen(buf);
}
/* Hardwired special events */
spev[0].name = strdup(PESACH);
spev[0].nlen = PESACHLEN;
spev[0].getev = pesach;
spev[1].name = strdup(EASTER);
spev[1].nlen = EASTERNAMELEN;
spev[1].getev = easter;
spev[2].name = strdup(PASKHA);
spev[2].nlen = PASKHALEN;
spev[2].getev = paskha;
for (i = 0; i < NUMEV; i++) {
if (spev[i].name == NULL)
err(1, NULL);
spev[i].uname = NULL;
}
}
void
settime(time_t *now)
{
tp = localtime(now);
tp->tm_sec = 0;
tp->tm_min = 0;
/* Avoid getting caught by a timezone shift; set time to noon */
tp->tm_isdst = 0;
tp->tm_hour = 12;
*now = mktime(tp);
if (isleap(tp->tm_year + TM_YEAR_BASE))
cumdays = daytab[1];
else
cumdays = daytab[0];
/* Friday displays Monday's events */
offset = tp->tm_wday == 5 ? 3 : 1;
if (f_SetdayAfter)
offset = 0; /* Except not when range is set explicitly */
header[5].iov_base = dayname;
(void) setlocale(LC_TIME, "C");
header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
(void) setlocale(LC_TIME, "");
setnnames();
}
/* convert [Year][Month]Day into unix time (since 1970)
* Year: two or four digits, Month: two digits, Day: two digits
*/
time_t
Mktime(char *date)
{
time_t t;
int len;
struct tm tm;
(void)time(&t);
tp = localtime(&t);
len = strlen(date);
if (len < 2)
return((time_t)-1);
tm.tm_sec = 0;
tm.tm_min = 0;
/* Avoid getting caught by a timezone shift; set time to noon */
tm.tm_isdst = 0;
tm.tm_hour = 12;
tm.tm_wday = 0;
tm.tm_mday = tp->tm_mday;
tm.tm_mon = tp->tm_mon;
tm.tm_year = tp->tm_year;
/* Day */
tm.tm_mday = atoi(date + len - 2);
/* Month */
if (len >= 4) {
*(date + len - 2) = '\0';
tm.tm_mon = atoi(date + len - 4) - 1;
}
/* Year */
if (len >= 6) {
*(date + len - 4) = '\0';
tm.tm_year = atoi(date);
/* tm_year up TM_YEAR_BASE ... */
if (tm.tm_year < 69) /* Y2K */
tm.tm_year += 2000 - TM_YEAR_BASE;
else if (tm.tm_year < 100)
tm.tm_year += 1900 - TM_YEAR_BASE;
else if (tm.tm_year > TM_YEAR_BASE)
tm.tm_year -= TM_YEAR_BASE;
}
#if DEBUG
printf("Mktime: %d %d %d %s\n", (int)mktime(&tm), (int)t, len,
asctime(&tm));
#endif
return(mktime(&tm));
}
void
adjust_calendar(int *day, int *month)
{
switch (calendar) {
case GREGORIAN:
break;
case JULIAN:
*day += julian;
if (*day > (cumdays[*month + 1] - cumdays[*month])) {
*day -= (cumdays[*month + 1] - cumdays[*month]);
if (++*month > 12)
*month = 1;
}
break;
case LUNAR:
break;
}
}
/*
* Possible date formats include any combination of:
* 3-charmonth (January, Jan, Jan)
* 3-charweekday (Friday, Monday, mon.)
* numeric month or day (1, 2, 04)
*
* Any character except \t or '*' may separate them, or they may not be
* separated. Any line following a line that is matched, that starts
* with \t, is shown along with the matched line.
*/
struct match *
isnow(char *endp, int bodun)
{
int day = 0, flags = 0, month = 0, v1, v2, i;
int monthp, dayp, varp = 0;
struct match *matches = NULL, *tmp, *tmp2;
int interval = YEARLY; /* how frequently the event repeats. */
int vwd = 0; /* Variable weekday */
time_t tdiff, ttmp;
struct tm tmtmp;
/*
* CONVENTION
*
* Month: 1-12
* Monthname: Jan .. Dec
* Day: 1-31
* Weekday: Mon-Sun
*
*/
/* read first field */
/* didn't recognize anything, skip it */
if (!(v1 = getfield(endp, &endp, &flags)))
return (NULL);
/* adjust bodun rate */
if (bodun && !bodun_always)
bodun = !arc4random_uniform(3);
/* Easter or Easter depending days */
if (flags & F_SPECIAL)
vwd = v1;
/*
* 1. {Weekday,Day} XYZ ...
*
* where Day is > 12
*/
else if (flags & F_ISDAY || v1 > 12) {
/* found a day; day: 13-31 or weekday: 1-7 */
day = v1;
/* {Day,Weekday} {Month,Monthname} ... */
/* if no recognizable month, assume just a day alone -- this is
* very unlikely and can only happen after the first 12 days.
* --find month or use current month */
if (!(month = getfield(endp, &endp, &flags))) {
month = tp->tm_mon + 1;
/* F_ISDAY is set only if a weekday was spelled out */
/* F_ISDAY must be set if 0 < day < 8 */
if ((day <= 7) && (day >= 1))
interval = WEEKLY;
else
interval = MONTHLY;
} else if ((day <= 7) && (day >= 1))
day += 10;
/* it's a weekday; make it the first one of the month */
if (month == -1) {
month = tp->tm_mon + 1;
interval = MONTHLY;
} else if (calendar)
adjust_calendar(&day, &month);
if ((month > 12) || (month < 1))
return (NULL);
}
/* 2. {Monthname} XYZ ... */
else if (flags & F_ISMONTH) {
month = v1;
if (month == -1) {
month = tp->tm_mon + 1;
interval = MONTHLY;
}
/* Monthname {day,weekday} */
/* if no recognizable day, assume the first day in month */
if (!(day = getfield(endp, &endp, &flags)))
day = 1;
/* If a weekday was spelled out without an ordering,
* assume the first of that day in the month */
if ((flags & F_ISDAY)) {
if ((day >= 1) && (day <=7))
day += 10;
} else if (calendar)
adjust_calendar(&day, &month);
}
/* Hm ... */
else {
v2 = getfield(endp, &endp, &flags);
/*
* {Day} {Monthname} ...
* where Day <= 12
*/
if (flags & F_ISMONTH) {
day = v1;
month = v2;
if (month == -1) {
month = tp->tm_mon + 1;
interval = MONTHLY;
} else if (calendar)
adjust_calendar(&day, &month);
}
/* {Month} {Weekday,Day} ... */
else {
/* F_ISDAY set, v2 > 12, or no way to tell */
month = v1;
/* if no recognizable day, assume the first */
day = v2 ? v2 : 1;
if ((flags & F_ISDAY)) {
if ((day >= 1) && (day <= 7))
day += 10;
} else
adjust_calendar(&day, &month);
}
}
/* convert Weekday into *next* Day,
* e.g.: 'Sunday' -> 22
* 'SundayLast' -> ??
*/
if (flags & F_ISDAY) {
#if DEBUG
fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
#endif
varp = 1;
/* variable weekday, SundayLast, MondayFirst ... */
if (day < 0 || day >= 10)
vwd = day;
else {
day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
interval = WEEKLY;
}
} else
/* Check for silliness. Note we still catch Feb 29 */
if (!(flags & F_SPECIAL) &&
(day > (cumdays[month + 1] - cumdays[month]) || day < 1)) {
if (!((month == 2 && day == 29) ||
(interval == MONTHLY && day <= 31)))
return (NULL);
}
if (!(flags & F_SPECIAL)) {
monthp = month;
dayp = day;
day = cumdays[month] + day;
#if DEBUG
fprintf(stderr, "day2: day %d(%d) yday %d\n", dayp, day, tp->tm_yday);
#endif
/* Speed up processing for the most common situation: yearly events
* when the interval being checked is less than a month or so (this
* could be less than a year, but then we have to start worrying about
* leap years). Only one event can match, and it's easy to find.
* Note we can't check special events, because they can wander widely.
*/
if (((v1 = offset + f_dayAfter) < 50) && (interval == YEARLY)) {
memcpy(&tmtmp, tp, sizeof(struct tm));
tmtmp.tm_mday = dayp;
tmtmp.tm_mon = monthp - 1;
if (vwd) {
/* We want the event next year if it's late now
* this year. The 50-day limit means we don't have to
* worry if next year is or isn't a leap year.
*/
if (tp->tm_yday > 300 && tmtmp.tm_mon <= 1)
variable_weekday(&vwd, tmtmp.tm_mon + 1,
tmtmp.tm_year + TM_YEAR_BASE + 1);
else
variable_weekday(&vwd, tmtmp.tm_mon + 1,
tmtmp.tm_year + TM_YEAR_BASE);
day = cumdays[tmtmp.tm_mon + 1] + vwd;
tmtmp.tm_mday = vwd;
}
v2 = day - tp->tm_yday;
if ((v2 > v1) || (v2 < 0)) {
if ((v2 += isleap(tp->tm_year + TM_YEAR_BASE) ? 366 : 365)
<= v1)
tmtmp.tm_year++;
else if(!bodun || (day - tp->tm_yday) != -1)
return(NULL);
}
if ((tmp = malloc(sizeof(struct match))) == NULL)
err(1, NULL);
if (bodun && (day - tp->tm_yday) == -1) {
tmp->when = f_time - 1 * SECSPERDAY;
tmtmp.tm_mday++;
tmp->bodun = 1;
} else {
tmp->when = f_time + v2 * SECSPERDAY;
tmp->bodun = 0;
}
(void)mktime(&tmtmp);
if (strftime(tmp->print_date,
sizeof(tmp->print_date),
/* "%a %b %d", &tm); Skip weekdays */
"%b %d", &tmtmp) == 0)
tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
tmp->var = varp;
tmp->next = NULL;
return(tmp);
}
} else {
varp = 1;
/* Set up v1 to the event number and ... */
v1 = vwd % (NUMEV + 1) - 1;
vwd /= (NUMEV + 1);
if (v1 < 0) {
v1 += NUMEV + 1;
vwd--;
}
dayp = monthp = 1; /* Why not */
}
/* Compare to past and coming instances of the event. The i == 0 part
* of the loop corresponds to this specific instance. Note that we
* can leave things sort of higgledy-piggledy since a mktime() happens
* on this before anything gets printed. Also note that even though
* we've effectively gotten rid of f_dayBefore, we still have to check
* the one prior event for situations like "the 31st of every month"
* and "yearly" events which could happen twice in one year but not in
* the next */
tmp2 = matches;
for (i = -1; i < 2; i++) {
memcpy(&tmtmp, tp, sizeof(struct tm));
tmtmp.tm_mday = dayp;
tmtmp.tm_mon = month = monthp - 1;
do {
v2 = 0;
switch (interval) {
case WEEKLY:
tmtmp.tm_mday += 7 * i;
break;
case MONTHLY:
month += i;
tmtmp.tm_mon = month;
switch(tmtmp.tm_mon) {
case -1:
tmtmp.tm_mon = month = 11;
tmtmp.tm_year--;
break;
case 12:
tmtmp.tm_mon = month = 0;
tmtmp.tm_year++;
break;
}
if (vwd) {
v1 = vwd;
variable_weekday(&v1, tmtmp.tm_mon + 1,
tmtmp.tm_year + TM_YEAR_BASE);
tmtmp.tm_mday = v1;
} else
tmtmp.tm_mday = dayp;
break;
case YEARLY:
default:
tmtmp.tm_year += i;
if (flags & F_SPECIAL) {
tmtmp.tm_mon = 0; /* Gee, mktime() is nice */
tmtmp.tm_mday = spev[v1].getev(tmtmp.tm_year +
TM_YEAR_BASE) + vwd;
} else if (vwd) {
v1 = vwd;
variable_weekday(&v1, tmtmp.tm_mon + 1,
tmtmp.tm_year + TM_YEAR_BASE);
tmtmp.tm_mday = v1;
} else {
/* Need the following to keep Feb 29 from
* becoming Mar 1 */
tmtmp.tm_mday = dayp;
tmtmp.tm_mon = monthp - 1;
}
break;
}
/* How many days apart are we */
if ((ttmp = mktime(&tmtmp)) == -1)
warnx("time out of range: %s", endp);
else {
tdiff = difftime(ttmp, f_time)/ SECSPERDAY;
if (tdiff <= offset + f_dayAfter ||
(bodun && tdiff == -1)) {
if (tdiff >= 0 ||
(bodun && tdiff == -1)) {
if ((tmp = malloc(sizeof(struct match))) == NULL)
err(1, NULL);
tmp->when = ttmp;
if (strftime(tmp->print_date,
sizeof(tmp->print_date),
/* "%a %b %d", &tm); Skip weekdays */
"%b %d", &tmtmp) == 0)
tmp->print_date[sizeof(tmp->print_date) - 1] = '\0';
tmp->bodun = bodun && tdiff == -1;
tmp->var = varp;
tmp->next = NULL;
if (tmp2)
tmp2->next = tmp;
else
matches = tmp;
tmp2 = tmp;
v2 = (i == 1) ? 1 : 0;
}
} else
i = 2; /* No point checking in the future */
}
} while (v2 != 0);
}
return (matches);
}
int
getmonth(char *s)
{
char **p;
struct fixs *n;
for (n = fnmonths; n->name; ++n)
if (!strncasecmp(s, n->name, n->len))
return ((n - fnmonths) + 1);
for (n = nmonths; n->name; ++n)
if (!strncasecmp(s, n->name, n->len))
return ((n - nmonths) + 1);
for (p = months; *p; ++p)
if (!strncasecmp(s, *p, 3))
return ((p - months) + 1);
return (0);
}
int
getday(char *s)
{
char **p;
struct fixs *n;
for (n = fndays; n->name; ++n)
if (!strncasecmp(s, n->name, n->len))
return ((n - fndays) + 1);
for (n = ndays; n->name; ++n)
if (!strncasecmp(s, n->name, n->len))
return ((n - ndays) + 1);
for (p = days; *p; ++p)
if (!strncasecmp(s, *p, 3))
return ((p - days) + 1);
return (0);
}
/* return offset for variable weekdays
* -1 -> last weekday in month
* +1 -> first weekday in month
* ... etc ...
*/
int
getdayvar(char *s)
{
int offset;
offset = strlen(s);
/* Sun+1 or Wednesday-2
* ^ ^ */
/* printf ("x: %s %s %d\n", s, s + offset - 2, offset); */
switch(*(s + offset - 2)) {
case '-':
case '+':
return(atoi(s + offset - 2));
break;
}
/*
* some aliases: last, first, second, third, fourth
*/
/* last */
if (offset > 4 && !strcasecmp(s + offset - 4, "last"))
return(-1);
else if (offset > 5 && !strcasecmp(s + offset - 5, "first"))
return(+1);
else if (offset > 6 && !strcasecmp(s + offset - 6, "second"))
return(+2);
else if (offset > 5 && !strcasecmp(s + offset - 5, "third"))
return(+3);
else if (offset > 6 && !strcasecmp(s + offset - 6, "fourth"))
return(+4);
/* no offset detected */
return(0);
}
int
foy(int year)
{
/* 0-6; what weekday Jan 1 is */
year--;
return ((1 - year/100 + year/400 + (int)(365.25 * year)) % 7);
}
void
variable_weekday(int *day, int month, int year)
{
int v1, v2;
int *cumdays;
int day1;
if (isleap(year))
cumdays = daytab[1];
else
cumdays = daytab[0];
day1 = foy(year);
/* negative offset; last, -4 .. -1 */
if (*day < 0) {
v1 = *day/10 - 1; /* offset -4 ... -1 */
*day = 10 + (*day % 10); /* day 1 ... 7 */
/* which weekday the end of the month is (1-7) */
v2 = (cumdays[month + 1] + day1) % 7 + 1;
/* and subtract enough days */
*day = cumdays[month + 1] - cumdays[month] +
(v1 + 1) * 7 - (v2 - *day + 7) % 7;
#if DEBUG
fprintf(stderr, "\nMonth %d ends on weekday %d\n", month, v2);
#endif
}
/* first, second ... +1 ... +5 */
else {
v1 = *day/10; /* offset */
*day = *day % 10;
/* which weekday the first of the month is (1-7) */
v2 = (cumdays[month] + 1 + day1) % 7 + 1;
/* and add enough days */
*day = 1 + (v1 - 1) * 7 + (*day - v2 + 7) % 7;
#if DEBUG
fprintf(stderr, "\nMonth %d starts on weekday %d\n", month, v2);
#endif
}
}