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      1 /*	$NetBSD: clockvar.h,v 1.4 2006/09/05 01:38:59 rumble Exp $	*/
      2 
      3 /*-
      4  * Copyright (C) 1999 Tsubai Masanari.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #define IRIX_CLOCK_BASE 1940
     30 
     31 /*
     32  * If year < 1985, store (year - 1970), else (year - 1940). This
     33  * matches IRIX semantics.
     34  */
     35 #define TO_IRIX_YEAR(a)	((a) < 1985) ? ((a) - (30 + IRIX_CLOCK_BASE))	\
     36     : ((a) - IRIX_CLOCK_BASE)
     37 
     38 /* RTC base on IRIX is 1940, offsets < 45 are from 1970 */
     39 #define FROM_IRIX_YEAR(a) ((a) < 45) ? ((a) + 30 + IRIX_CLOCK_BASE)	\
     40     : ((a) + IRIX_CLOCK_BASE)
     41