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/* -*- Mode: C -*-
======================================================================
FILE: icaltime.c
CREATOR: eric 02 June 2000
$Id$
$Locker$
(C) COPYRIGHT 2000, Eric Busboom, http://www.softwarestudio.org
This program is free software; you can redistribute it and/or modify
it under the terms of either:
The LGPL as published by the Free Software Foundation, version
2.1, available at: http://www.fsf.org/copyleft/lesser.html
Or:
The Mozilla Public License Version 1.0. You may obtain a copy of
the License at http://www.mozilla.org/MPL/
The Original Code is eric. The Initial Developer of the Original
Code is Eric Busboom
======================================================================*/
#include "icaltime.h"
#include <assert.h>
struct icaltimetype
icaltime_from_timet(time_t tm, int is_date, int is_utc)
{
struct icaltimetype tt;
struct tm t;
if(is_utc == 1){
t = *(gmtime(&tm));
} else {
t = *(localtime(&tm));
}
tt.second = t.tm_sec;
tt.minute = t.tm_min;
tt.hour = t.tm_hour;
tt.day = t.tm_mday;
tt.month = t.tm_mon + 1;
tt.year = t.tm_year+ 1900;
tt.is_utc = is_utc;
tt.is_date = is_date;
return tt;
}
time_t icaltime_as_timet(struct icaltimetype tt)
{
struct tm stm;
time_t tut;
memset(&stm,0,sizeof( struct tm));
stm.tm_sec = tt.second;
stm.tm_min = tt.minute;
stm.tm_hour = tt.hour;
stm.tm_mday = tt.day;
stm.tm_mon = tt.month-1;
stm.tm_year = tt.year-1900;
stm.tm_isdst = -1; /* prevents mktime from changing hour based on
daylight savings */
tut = mktime(&stm);
return tut;
}
short days_in_month[] = {0,31,28,31,30,31,30,31,31,30,31,30,31};
short icaltime_days_in_month(short month,short year)
{
int is_leap =0;
int days = days_in_month[month];
assert(month > 0);
assert(month <= 12);
if( (year % 4 == 0 && year % 100 != 0) ||
year % 400 == 0){
is_leap =1;
}
if( month == 2){
days += is_leap;
}
return days;
}
/* 1-> Sunday, 7->Saturday */
short icaltime_day_of_week(struct icaltimetype t){
time_t tt = icaltime_as_timet(t);
struct tm *tm;
tm = gmtime(&tt);
return tm->tm_wday+1;
}
short icaltime_start_doy_of_week(struct icaltimetype t){
time_t tt = icaltime_as_timet(t);
time_t start_tt;
struct tm *stm;
stm = gmtime(&tt);
start_tt = tt - stm->tm_wday*(60*60*24);
stm = gmtime(&start_tt);
return stm->tm_yday;
}
short icaltime_day_of_year(struct icaltimetype t){
time_t tt = icaltime_as_timet(t);
struct tm *stm;
stm = gmtime(&tt);
return stm->tm_yday;
}
struct icaltimetype icaltime_from_day_of_year(short doy, short year)
{
struct tm stm;
time_t tt;
/* Get the time of january 1 of this year*/
memset(&stm,0,sizeof(struct tm));
stm.tm_year = year-1900;
stm.tm_mday = 1;
tt = mktime(&stm);
/* Now add in the days */
tt += doy *60*60*24;
return icaltime_from_timet(tt, 1, 1);
}
struct icaltimetype icaltime_null_time()
{
struct icaltimetype t;
memset(&t,0,sizeof(struct icaltimetype));
return t;
}
int icaltime_is_null_time(struct icaltimetype t)
{
if (t.second +t.minute+t.hour+t.day+t.month+t.year == 0){
return 1;
}
return 0;
}
int icaltime_compare(struct icaltimetype a,struct icaltimetype b)
{
time_t t1 = icaltime_as_timet(a);
time_t t2 = icaltime_as_timet(b);
if (t1 > t2) {
return 1;
} else if (t1 < t2) {
return -1;
} else {
return 0;
}
}
int icaltime_compare_date_only(struct icaltimetype a, struct icaltimetype b)
{
time_t t1 = icaltime_as_timet(a);
time_t t2 = icaltime_as_timet(b);
if (a.year == b.year && a.month == b.month && a.day == b.day) {
return 0;
}
if (t1 > t2) {
return 1;
} else if (t1 < t2) {
return -1;
}
}
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