1 files changed, 182 insertions, 0 deletions
diff --git a/libical/src/libical/icaltime.c b/libical/src/libical/icaltime.c
new file mode 100644
index 0000000000..6f17278bde
--- /dev/null
+++ b/libical/src/libical/icaltime.c
@@ -0,0 +1,182 @@
+/* -*- 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; 
+    }
+
+}