GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.sbin/ndp/gmt2local.c Lines: 0 12 0.0 %
Date: 2017-11-13 Branches: 0 4 0.0 %

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/*	$OpenBSD: gmt2local.c,v 1.4 2013/08/09 17:52:12 bluhm Exp $	*/
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/*
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 * Copyright (c) 1997
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 *	The Regents of the University of California.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that: (1) source code distributions
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 * retain the above copyright notice and this paragraph in its entirety, (2)
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 * distributions including binary code include the above copyright notice and
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 * this paragraph in its entirety in the documentation or other materials
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 * provided with the distribution, and (3) all advertising materials mentioning
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 * features or use of this software display the following acknowledgement:
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 * ``This product includes software developed by the University of California,
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 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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 * the University nor the names of its contributors may be used to endorse
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 * or promote products derived from this software without specific prior
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 * written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 */
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#include <sys/types.h>
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#include <sys/time.h>
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#include <stdio.h>
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#include <time.h>
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#include "gmt2local.h"
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/*
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 * Returns the difference between gmt and local time in seconds.
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 * Use gmtime() and localtime() to keep things simple.
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 */
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int32_t
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gmt2local(time_t t)
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{
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	register int dt, dir;
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	register struct tm *gmt, *loc;
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	struct tm sgmt;
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	if (t == 0)
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		t = time(NULL);
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	gmt = &sgmt;
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	*gmt = *gmtime(&t);
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	loc = localtime(&t);
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	dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 +
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	    (loc->tm_min - gmt->tm_min) * 60;
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	/*
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	 * If the year or julian day is different, we span 00:00 GMT
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	 * and must add or subtract a day. Check the year first to
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	 * avoid problems when the julian day wraps.
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	 */
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	dir = loc->tm_year - gmt->tm_year;
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	if (dir == 0)
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		dir = loc->tm_yday - gmt->tm_yday;
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	dt += dir * 24 * 60 * 60;
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	return (dt);
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}