1da2e3ebdSchin /***********************************************************************
2da2e3ebdSchin * *
3da2e3ebdSchin * This software is part of the ast package *
4*b30d1939SAndy Fiddaman * Copyright (c) 1985-2011 AT&T Intellectual Property *
5da2e3ebdSchin * and is licensed under the *
6*b30d1939SAndy Fiddaman * Eclipse Public License, Version 1.0 *
77c2fbfb3SApril Chin * by AT&T Intellectual Property *
8da2e3ebdSchin * *
9da2e3ebdSchin * A copy of the License is available at *
10*b30d1939SAndy Fiddaman * http://www.eclipse.org/org/documents/epl-v10.html *
11*b30d1939SAndy Fiddaman * (with md5 checksum b35adb5213ca9657e911e9befb180842) *
12da2e3ebdSchin * *
13da2e3ebdSchin * Information and Software Systems Research *
14da2e3ebdSchin * AT&T Research *
15da2e3ebdSchin * Florham Park NJ *
16da2e3ebdSchin * *
17da2e3ebdSchin * Glenn Fowler <gsf@research.att.com> *
18da2e3ebdSchin * David Korn <dgk@research.att.com> *
19da2e3ebdSchin * Phong Vo <kpv@research.att.com> *
20da2e3ebdSchin * *
21da2e3ebdSchin ***********************************************************************/
22da2e3ebdSchin #pragma prototyped
23da2e3ebdSchin /*
24da2e3ebdSchin * Glenn Fowler
25da2e3ebdSchin * AT&T Research
26da2e3ebdSchin *
27da2e3ebdSchin * time_t conversion support
28da2e3ebdSchin */
29da2e3ebdSchin
30da2e3ebdSchin #include <tm.h>
31da2e3ebdSchin
32da2e3ebdSchin /*
33da2e3ebdSchin * use one of the 14 equivalent calendar years to determine
34da2e3ebdSchin * daylight savings time for future years beyond the range
3534f9b3eeSRoland Mainz * of the local system (via tmxtm())
36da2e3ebdSchin */
37da2e3ebdSchin
38da2e3ebdSchin static const short equiv[] =
39da2e3ebdSchin {
40da2e3ebdSchin 2006, 2012,
41da2e3ebdSchin 2001, 2024,
42da2e3ebdSchin 2002, 2008,
43da2e3ebdSchin 2003, 2020,
44da2e3ebdSchin 2009, 2004,
45da2e3ebdSchin 2010, 2016,
46da2e3ebdSchin 2005, 2000,
47da2e3ebdSchin };
48da2e3ebdSchin
49da2e3ebdSchin /*
50da2e3ebdSchin * return the circa 2000 equivalent calendar year for tm
51da2e3ebdSchin */
52da2e3ebdSchin
53da2e3ebdSchin int
tmequiv(Tm_t * tm)54da2e3ebdSchin tmequiv(Tm_t* tm)
55da2e3ebdSchin {
56da2e3ebdSchin return tm->tm_year < (2038 - 1900) ? (tm->tm_year + 1900) : equiv[tm->tm_wday + tmisleapyear(tm->tm_year)];
57da2e3ebdSchin }
58