FreeBSD-5.3/usr.bin/calendar/day.c
/*
* 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. 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/usr.bin/calendar/day.c,v 1.20 2002/06/13 21:20:56 grog Exp $");
#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 "pathnames.h"
#include "calendar.h"
struct tm *tp;
int *cumdays, offset, yrdays;
char dayname[10];
/* 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 const *days[] = {
"sun", "mon", "tue", "wed", "thu", "fri", "sat", NULL,
};
static const 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;
strftime(buf, sizeof(buf), "%a", &tm);
for (l = strlen(buf);
l > 0 && isspace((unsigned char)buf[l - 1]);
l--)
;
buf[l] = '\0';
if (ndays[i].name != NULL)
free(ndays[i].name);
if ((ndays[i].name = strdup(buf)) == NULL)
errx(1, "cannot allocate memory");
ndays[i].len = strlen(buf);
strftime(buf, sizeof(buf), "%A", &tm);
for (l = strlen(buf);
l > 0 && isspace((unsigned char)buf[l - 1]);
l--)
;
buf[l] = '\0';
if (fndays[i].name != NULL)
free(fndays[i].name);
if ((fndays[i].name = strdup(buf)) == NULL)
errx(1, "cannot allocate memory");
fndays[i].len = strlen(buf);
}
for (i = 0; i < 12; i++) {
tm.tm_mon = i;
strftime(buf, sizeof(buf), "%b", &tm);
for (l = strlen(buf);
l > 0 && isspace((unsigned char)buf[l - 1]);
l--)
;
buf[l] = '\0';
if (nmonths[i].name != NULL)
free(nmonths[i].name);
if ((nmonths[i].name = strdup(buf)) == NULL)
errx(1, "cannot allocate memory");
nmonths[i].len = strlen(buf);
strftime(buf, sizeof(buf), "%B", &tm);
for (l = strlen(buf);
l > 0 && isspace((unsigned char)buf[l - 1]);
l--)
;
buf[l] = '\0';
if (fnmonths[i].name != NULL)
free(fnmonths[i].name);
if ((fnmonths[i].name = strdup(buf)) == NULL)
errx(1, "cannot allocate memory");
fnmonths[i].len = strlen(buf);
}
}
void
settime(now)
time_t now;
{
char *oldl, *lbufp;
tp = localtime(&now);
if ( isleap(tp->tm_year + 1900) ) {
yrdays = 366;
cumdays = daytab[1];
} else {
yrdays = 365;
cumdays = daytab[0];
}
/* Friday displays Monday's events */
offset = tp->tm_wday == Friday ? 3 : 1;
header[5].iov_base = dayname;
oldl = NULL;
lbufp = setlocale(LC_TIME, NULL);
if (lbufp != NULL && (oldl = strdup(lbufp)) == NULL)
errx(1, "cannot allocate memory");
(void) setlocale(LC_TIME, "C");
header[5].iov_len = strftime(dayname, sizeof(dayname), "%A", tp);
(void) setlocale(LC_TIME, (oldl != NULL ? oldl : ""));
if (oldl != NULL)
free(oldl);
setnnames();
}
/* convert Day[/Month][/Year] into unix time (since 1970)
* Day: two digits, Month: two digits, Year: digits
*/
time_t Mktime (dp)
char *dp;
{
time_t t;
int d, m, y;
struct tm tm;
(void)time(&t);
tp = localtime(&t);
tm.tm_sec = 0;
tm.tm_min = 0;
tm.tm_hour = 0;
tm.tm_wday = 0;
tm.tm_mday = tp->tm_mday;
tm.tm_mon = tp->tm_mon;
tm.tm_year = tp->tm_year;
switch (sscanf(dp, "%d.%d.%d", &d, &m, &y)) {
case 3:
if (y > 1900)
y -= 1900;
tm.tm_year = y;
/* FALLTHROUGH */
case 2:
tm.tm_mon = m - 1;
/* FALLTHROUGH */
case 1:
tm.tm_mday = d;
}
#ifdef DEBUG
fprintf(stderr, "Mktime: %d %d %s\n", (int)mktime(&tm), (int)t,
asctime(&tm));
#endif
return(mktime(&tm));
}
/*
* 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 may separate them, or they may not be separated. Any line,
* following a line that is matched, that starts with "whitespace", is shown
* along with the matched line.
*/
int
isnow(endp, monthp, dayp, varp)
char *endp;
int *monthp;
int *dayp;
int *varp;
{
int day, flags, month = 0, v1, v2;
/*
* CONVENTION
*
* Month: 1-12
* Monthname: Jan .. Dec
* Day: 1-31
* Weekday: Mon-Sun
*
*/
flags = 0;
/* read first field */
/* didn't recognize anything, skip it */
if (!(v1 = getfield(endp, &endp, &flags)))
return (0);
/* Easter or Easter depending days */
if (flags & F_EASTER)
day = v1 - 1; /* days since January 1 [0-365] */
/*
* 1. {Weekday,Day} XYZ ...
*
* where Day is > 12
*/
else if (flags & F_ISDAY || v1 > 12) {
/* found a day; day: 1-31 or weekday: 1-7 */
day = v1;
/* {Day,Weekday} {Month,Monthname} ... */
/* if no recognizable month, assume just a day alone
* in other words, find month or use current month */
if (!(month = getfield(endp, &endp, &flags)))
month = tp->tm_mon + 1;
}
/* 2. {Monthname} XYZ ... */
else if (flags & F_ISMONTH) {
month = v1;
/* Monthname {day,weekday} */
/* if no recognizable day, assume the first day in month */
if (!(day = getfield(endp, &endp, &flags)))
day = 1;
}
/* Hm ... */
else {
v2 = getfield(endp, &endp, &flags);
/*
* {Day} {Monthname} ...
* where Day <= 12
*/
if (flags & F_ISMONTH) {
day = v1;
month = v2;
*varp = 0;
}
/* {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;
*varp = 0;
}
}
/* convert Weekday into *next* Day,
* e.g.: 'Sunday' -> 22
* 'SundayLast' -> ??
*/
if (flags & F_ISDAY) {
#ifdef DEBUG
fprintf(stderr, "\nday: %d %s month %d\n", day, endp, month);
#endif
*varp = 1;
/* variable weekday, SundayLast, MondayFirst ... */
if (day < 0 || day >= 10) {
/* negative offset; last, -4 .. -1 */
if (day < 0) {
v1 = day/10 - 1; /* offset -4 ... -1 */
day = 10 + (day % 10); /* day 1 ... 7 */
/* day, eg '22nd' */
v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
/* (month length - day) / 7 + 1 */
if (cumdays[month+1] - cumdays[month] >= v2
&& ((int)((cumdays[month+1] -
cumdays[month] - v2) / 7) + 1) == -v1)
/* bingo ! */
day = v2;
/* set to yesterday */
else {
day = tp->tm_mday - 1;
if (day == 0)
return (0);
}
}
/* first, second ... +1 ... +5 */
else {
v1 = day/10; /* offset: +1 (first Sunday) ... */
day = day % 10;
/* day, eg '22th' */
v2 = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
/* Hurrah! matched */
if ( ((v2 - 1 + 7) / 7) == v1 )
day = v2;
/* set to yesterday */
else {
day = tp->tm_mday - 1;
if (day == 0)
return (0);
}
}
}
/* wired */
else {
day = tp->tm_mday + (((day - 1) - tp->tm_wday + 7) % 7);
*varp = 1;
}
}
if (!(flags & F_EASTER)) {
*monthp = month;
*dayp = day;
day = cumdays[month] + day;
}
else {
for (v1 = 0; day > cumdays[v1]; v1++)
;
*monthp = v1 - 1;
*dayp = day - cumdays[v1 - 1];
*varp = 1;
}
#ifdef DEBUG
fprintf(stderr, "day2: day %d(%d-%d) yday %d\n", *dayp, day, cumdays[month], tp->tm_yday);
#endif
/* if today or today + offset days */
if (day >= tp->tm_yday - f_dayBefore &&
day <= tp->tm_yday + offset + f_dayAfter)
return (1);
/* if number of days left in this year + days to event in next year */
if (yrdays - tp->tm_yday + day <= offset + f_dayAfter ||
/* a year backward, eg. 6 Jan and 10 days before -> 27. Dec */
tp->tm_yday + day - f_dayBefore < 0
)
return (1);
return (0);
}
int
getmonth(s)
char *s;
{
const 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(s)
char *s;
{
const 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(s)
char *s;
{
int offs;
offs = strlen(s);
/* Sun+1 or Wednesday-2
* ^ ^ */
/* fprintf(stderr, "x: %s %s %d\n", s, s + offs - 2, offs); */
switch(*(s + offs - 2)) {
case '-':
return(-(atoi(s + offs - 1)));
break;
case '+':
return(atoi(s + offs - 1));
break;
}
/*
* some aliases: last, first, second, third, fourth
*/
/* last */
if (offs > 4 && !strcasecmp(s + offs - 4, "last"))
return(-1);
else if (offs > 5 && !strcasecmp(s + offs - 5, "first"))
return(+1);
else if (offs > 6 && !strcasecmp(s + offs - 6, "second"))
return(+2);
else if (offs > 5 && !strcasecmp(s + offs - 5, "third"))
return(+3);
else if (offs > 6 && !strcasecmp(s + offs - 6, "fourth"))
return(+4);
/* no offset detected */
return(0);
}