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-rw-r--r--libical/src/libical/icaltime.c428
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diff --git a/libical/src/libical/icaltime.c b/libical/src/libical/icaltime.c
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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
-
-
- ======================================================================*/
-
-#ifdef HAVE_CONFIG_H
-#include "config.h"
-#endif
-
-#include "icaltime.h"
-#include "icalvalue.h"
-#include <assert.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-
-struct icaltimetype
-icaltime_from_timet(time_t tm, int is_date, int is_utc)
-{
- struct icaltimetype tt;
- struct tm t;
-
-#if 0 /* This is incorrect; a time_t *is* in UTC by definition. So we just ignore the flag. */
- if(is_utc == 0){
- tm += icaltime_local_utc_offset();
- }
-#endif
-
- t = *(gmtime(&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;
-
-#if 0
- tt.is_utc = is_utc;
-#endif
- tt.is_utc = 1;
- tt.is_date = is_date;
-
- return tt;
-}
-
-/* Always returns time in UTC */
-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 */
-
- if(tt.is_utc)
- stm.tm_sec -= icaltime_local_utc_offset();
-
- tut = mktime(&stm);
-
- return tut;
-}
-
-
-
-struct icaltimetype icaltime_from_string(const char* str)
-{
- struct icaltimetype tt;
- icalvalue *v = icalvalue_new_from_string(ICAL_DATETIME_VALUE,str);
-
- if (v == 0){
- return icaltime_null_time();
- }
-
- tt = icalvalue_get_datetime(v);
-
- icalvalue_free(v);
-
- return tt;
-
-}
-
-char ctime_str[20];
-char* icaltime_as_ctime(struct icaltimetype t)
-{
- time_t tt = icaltime_as_timet(t);
-
- sprintf(ctime_str,"%s",ctime(&tt));
-
- ctime_str[strlen(ctime_str)-1] = 0;
-
- return ctime_str;
-}
-
-
-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;
- time_t t2;
-
- if (a.year == b.year && a.month == b.month && a.day == b.day)
- return 0;
-
- t1 = icaltime_as_timet (a);
- t2 = icaltime_as_timet (b);
-
- if (t1 > t2)
- return 1;
- else if (t1 < t2)
- return -1;
- else {
- /* not reached */
- assert (0);
- return 0;
- }
-}
-
-/* convert tt, of timezone tzid, into a utc time */
-struct icaltimetype icaltime_as_utc(struct icaltimetype tt,const char* tzid)
-{
- time_t offset, tm;
- struct icaltimetype utc;
-
- offset = icaltime_utc_offset(tt,tzid);
- tm = icaltime_as_timet(tt);
-
- tm += offset;
-
- utc = icaltime_from_timet(tm,0,0);
-
- return utc;
-}
-
-/* convert tt, a time in UTC, into a time in timezone tzid */
-struct icaltimetype icaltime_as_zone(struct icaltimetype tt,const char* tzid)
-{
- time_t offset, tm;
- struct icaltimetype zone;
-
- offset = icaltime_utc_offset(tt,tzid);
- tm = icaltime_as_timet(tt);
-
- tm -= offset;
-
- zone = icaltime_from_timet(tm,0,0);
-
- return zone;
-
-}
-
-/* Return the offset of the named zone as seconds. tt is a time
- indicating the date for which you want the offset */
-time_t icaltime_utc_offset(struct icaltimetype tt, const char* tzid)
-{
-#ifdef HAVE_TIMEZONE
- extern long int timezone;
-#endif
- time_t now;
- struct tm *stm;
-
- char *tzstr = 0;
- char *tmp;
-
- /* Put the new time zone into the environment */
- if(getenv("TZ") != 0){
- tzstr = (char*)strdup(getenv("TZ"));
- }
-
- tmp = (char*)malloc(1024);
- snprintf(tmp,1024,"TZ=%s",tzid);
-
- putenv(tmp);
-
- /* Get the offset */
-
- now = icaltime_as_timet(tt);
-
- stm = localtime(&now); /* This sets 'timezone'*/
-
- /* restore the original environment */
-
- if(tzstr!=0){
- putenv(tzstr);
- } else {
- putenv("TZ"); /* Delete from environment */
- }
-
-#ifdef HAVE_TIMEZONE
- return timezone;
-#else
- return -stm->tm_gmtoff;
-#endif
-}
-
-time_t icaltime_local_utc_offset()
-{
- time_t now;
- struct tm *stm;
-
- stm = localtime(&now); /* This sets 'timezone'*/
-
-#ifdef HAVE_TIMEZONE
- return timezone;
-#else
- return -stm->tm_gmtoff;
-#endif
-}
-
-
-
-
-
-
-time_t
-icalperiodtype_duration (struct icalperiodtype period);
-
-
-time_t
-icalperiodtype_end (struct icalperiodtype period);
-
-
-/* From Russel Steinthal */
-time_t icaldurationtype_as_timet(struct icaldurationtype dur)
-{
- return (time_t) (dur.seconds +
- (60 * dur.minutes) +
- (60 * 60 * dur.hours) +
- (60 * 60 * 24 * dur.days) +
- (60 * 60 * 24 * 7 * dur.weeks));
-}
-
-/* From Seth Alves, <alves@hungry.com> */
-struct icaldurationtype icaldurationtype_from_timet(time_t t)
-{
- struct icaldurationtype dur;
- time_t used = 0;
-
- dur.weeks = (t - used) / (60 * 60 * 24 * 7);
- used += dur.weeks * (60 * 60 * 24 * 7);
- dur.days = (t - used) / (60 * 60 * 24);
- used += dur.days * (60 * 60 * 24);
- dur.hours = (t - used) / (60 * 60);
- used += dur.hours * (60 * 60);
- dur.minutes = (t - used) / (60);
- used += dur.minutes * (60);
- dur.seconds = (t - used);
-
- return dur;
-}
-
-struct icaldurationtype icaldurationtype_from_string(const char* str)
-{
-
- icalvalue *v = icalvalue_new_from_string(ICAL_DURATION_VALUE,str);
-
- if( v !=0){
- return icalvalue_get_duration(v);
- } else {
- struct icaldurationtype dur;
- memset(&dur,0,sizeof(struct icaldurationtype));
- return dur;
- }
-
-}
-
-
-struct icaltimetype icaltime_add(struct icaltimetype t,
- struct icaldurationtype d)
-{
- time_t tt = icaltime_as_timet(t);
- time_t dt = icaldurationtype_as_timet(d);
-
- return icaltime_from_timet(tt + dt, t.is_date, t.is_utc);
-
-}
-
-struct icaldurationtype icaltime_subtract(struct icaltimetype t1,
- struct icaltimetype t2)
-{
-
- time_t t1t = icaltime_as_timet(t1);
- time_t t2t = icaltime_as_timet(t2);
-
- return icaldurationtype_from_timet(t1t-t2t);
-
-
-}
-
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