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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*************************************************************************
3 : *
4 : * The Contents of this file are made available subject to the terms of
5 : * either of the following licenses
6 : *
7 : * - GNU Lesser General Public License Version 2.1
8 : * - Sun Industry Standards Source License Version 1.1
9 : *
10 : * Sun Microsystems Inc., October, 2000
11 : *
12 : * GNU Lesser General Public License Version 2.1
13 : * =============================================
14 : * Copyright 2000 by Sun Microsystems, Inc.
15 : * 901 San Antonio Road, Palo Alto, CA 94303, USA
16 : *
17 : * This library is free software; you can redistribute it and/or
18 : * modify it under the terms of the GNU Lesser General Public
19 : * License version 2.1, as published by the Free Software Foundation.
20 : *
21 : * This library is distributed in the hope that it will be useful,
22 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : * Lesser General Public License for more details.
25 : *
26 : * You should have received a copy of the GNU Lesser General Public
27 : * License along with this library; if not, write to the Free Software
28 : * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 : * MA 02111-1307 USA
30 : *
31 : *
32 : * Sun Industry Standards Source License Version 1.1
33 : * =================================================
34 : * The contents of this file are subject to the Sun Industry Standards
35 : * Source License Version 1.1 (the "License"); You may not use this file
36 : * except in compliance with the License. You may obtain a copy of the
37 : * License at http://www.openoffice.org/license.html.
38 : *
39 : * Software provided under this License is provided on an "AS IS" basis,
40 : * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
41 : * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
42 : * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
43 : * See the License for the specific provisions governing your rights and
44 : * obligations concerning the Software.
45 : *
46 : * The Initial Developer of the Original Code is: IBM Corporation
47 : *
48 : * Copyright: 2008 by IBM Corporation
49 : *
50 : * All Rights Reserved.
51 : *
52 : * Contributor(s): _______________________________________
53 : *
54 : *
55 : ************************************************************************/
56 : #include "localtime.hxx"
57 : #include <limits.h>
58 : #include <unicode/timezone.h>
59 : //End by
60 : const long DAY_SEC =24 * 60 * 60;
61 : const long YEAR_SEC = 365 * DAY_SEC;
62 : const long FOURYEAR_SEC = 4 * YEAR_SEC + DAY_SEC;
63 : #ifndef LONG_MAX
64 : const long LONG_MAX=2147483647;
65 : #endif
66 : //01-01-70 was a Thursday
67 : const long BASE_DOW = 4;
68 :
69 : long _lpdays[] = {-1, 30, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365};
70 :
71 : long _days[] = {-1, 30, 58, 89, 119, 150, 180, 211, 242, 272, 303, 333, 364};
72 :
73 8 : bool LtgGmTime(long rtime,LtTm& rtm)
74 : {
75 8 : if (rtime < 0)
76 : {
77 0 : return false;
78 : }
79 : //is-current-year-a-leap-year flag
80 8 : int islpyr = 0;
81 :
82 : long tmptim;
83 8 : long caltim = rtime;
84 8 : tmptim = (long)(caltim / FOURYEAR_SEC);
85 8 : caltim -= ((long)tmptim * FOURYEAR_SEC);
86 :
87 : //Determine which year of the interval
88 :
89 : // 1970, 1974, 1978,...,etc.
90 8 : tmptim = (tmptim * 4) + 70;
91 :
92 8 : if (caltim >= YEAR_SEC)
93 : {
94 : //1971, 1975, 1979,...,etc.
95 8 : tmptim++;
96 8 : caltim -= YEAR_SEC;
97 :
98 8 : if ( caltim >= YEAR_SEC )
99 : {
100 : // 1972, 1976, 1980,...,etc.
101 8 : tmptim++;
102 8 : caltim -= YEAR_SEC;
103 :
104 : //Note, it takes 366 days-worth of seconds to get past a leap year.
105 8 : if (caltim >= (YEAR_SEC + DAY_SEC))
106 : {
107 : //1973, 1977, 1981,...,etc.
108 0 : tmptim++;
109 0 : caltim -= (YEAR_SEC + DAY_SEC);
110 : }
111 : else
112 : {
113 : //In a leap year after all, set the flag.
114 8 : islpyr++;
115 : }
116 : }
117 : }
118 :
119 : //tmptim now holds the value for tm_year. caltim now holds the
120 : //number of elapsed seconds since the beginning of that year.
121 :
122 8 : rtm.tm_year = tmptim;
123 :
124 : //Determine days since January 1 (0 - 365). This is the tm_yday value.
125 : //Leave caltim with number of elapsed seconds in that day.
126 :
127 8 : rtm.tm_yday = (long)(caltim / DAY_SEC);
128 8 : caltim -= (long)(rtm.tm_yday) * DAY_SEC;
129 :
130 : //Determine months since January (0 - 11) and day of month (1 - 31)
131 :
132 : long* mdays;
133 8 : if ( islpyr )
134 : {
135 8 : mdays = _lpdays;
136 : }
137 : else
138 : {
139 0 : mdays = _days;
140 : }
141 :
142 8 : for ( tmptim = 1 ; mdays[tmptim] < rtm.tm_yday ; tmptim++ ) ;
143 :
144 8 : rtm.tm_mon = --tmptim;
145 :
146 8 : rtm.tm_mday = rtm.tm_yday - mdays[tmptim];
147 :
148 : //Determine days since Sunday (0 - 6)
149 :
150 8 : rtm.tm_wday = ((long)(rtime / DAY_SEC) + BASE_DOW) % 7;
151 :
152 : //Determine hours since midnight (0 - 23), minutes after the hour
153 : //(0 - 59), and seconds after the minute (0 - 59).
154 :
155 8 : rtm.tm_hour = (long)(caltim / 3600);
156 8 : caltim -= (long)rtm.tm_hour * 3600;
157 :
158 8 : rtm.tm_min = (long)(caltim / 60);
159 8 : rtm.tm_sec = (long)(caltim - (rtm.tm_min) * 60);
160 :
161 8 : rtm.tm_isdst = 0;
162 :
163 : //adjust year & month
164 8 : rtm.tm_year += 1900;
165 8 : ++(rtm.tm_mon);
166 :
167 8 : return true;
168 :
169 : };
170 8 : bool LtgLocalTime(long rtime,LtTm& rtm)
171 : {
172 8 : if (rtime < 0)
173 : {
174 0 : return false;
175 : }
176 :
177 8 : if ((rtime > 3 * DAY_SEC)&&(rtime < LONG_MAX - 3 * DAY_SEC))
178 : {
179 8 : TimeZone* pLocalZone = TimeZone::createDefault();
180 8 : long offset = (pLocalZone->getRawOffset())/1000;
181 8 : delete pLocalZone;
182 8 : long ltime = rtime + offset;
183 8 : return LtgGmTime(ltime,rtm);
184 : }
185 0 : return false;
186 : };
187 :
188 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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