1998-09-15 19:36:32 +00:00
|
|
|
/*
|
|
|
|
|
* Copyright (c) 1997
|
|
|
|
|
* The Regents of the University of California. All rights reserved.
|
|
|
|
|
*
|
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
|
|
|
* modification, are permitted provided that: (1) source code distributions
|
|
|
|
|
* retain the above copyright notice and this paragraph in its entirety, (2)
|
|
|
|
|
* distributions including binary code include the above copyright notice and
|
|
|
|
|
* this paragraph in its entirety in the documentation or other materials
|
|
|
|
|
* provided with the distribution, and (3) all advertising materials mentioning
|
|
|
|
|
* features or use of this software display the following acknowledgement:
|
|
|
|
|
* ``This product includes software developed by the University of California,
|
|
|
|
|
* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
|
|
|
|
|
* the University nor the names of its contributors may be used to endorse
|
|
|
|
|
* or promote products derived from this software without specific prior
|
|
|
|
|
* written permission.
|
|
|
|
|
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
|
|
|
|
|
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
|
|
|
|
|
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
|
|
|
|
|
*/
|
|
|
|
|
|
|
|
|
|
#ifndef lint
|
2004-03-31 09:17:26 +00:00
|
|
|
static const char rcsid[] _U_ =
|
2005-05-29 18:17:16 +00:00
|
|
|
"@(#) $Header: /tcpdump/master/tcpdump/gmt2local.c,v 1.9 2003/11/16 09:36:09 guy Exp $ (LBL)";
|
2000-01-30 00:45:58 +00:00
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
|
|
|
#include "config.h"
|
1998-09-15 19:36:32 +00:00
|
|
|
#endif
|
|
|
|
|
|
2004-03-31 09:17:26 +00:00
|
|
|
#include <tcpdump-stdinc.h>
|
1998-09-15 19:36:32 +00:00
|
|
|
|
|
|
|
|
#include <stdio.h>
|
|
|
|
|
|
|
|
|
|
#ifdef HAVE_OS_PROTO_H
|
|
|
|
|
#include "os-proto.h"
|
|
|
|
|
#endif
|
|
|
|
|
|
|
|
|
|
#include "gmt2local.h"
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* Returns the difference between gmt and local time in seconds.
|
|
|
|
|
* Use gmtime() and localtime() to keep things simple.
|
|
|
|
|
*/
|
|
|
|
|
int32_t
|
|
|
|
|
gmt2local(time_t t)
|
|
|
|
|
{
|
|
|
|
|
register int dt, dir;
|
|
|
|
|
register struct tm *gmt, *loc;
|
|
|
|
|
struct tm sgmt;
|
|
|
|
|
|
|
|
|
|
if (t == 0)
|
|
|
|
|
t = time(NULL);
|
|
|
|
|
gmt = &sgmt;
|
|
|
|
|
*gmt = *gmtime(&t);
|
|
|
|
|
loc = localtime(&t);
|
|
|
|
|
dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 +
|
|
|
|
|
(loc->tm_min - gmt->tm_min) * 60;
|
|
|
|
|
|
|
|
|
|
/*
|
|
|
|
|
* If the year or julian day is different, we span 00:00 GMT
|
|
|
|
|
* and must add or subtract a day. Check the year first to
|
|
|
|
|
* avoid problems when the julian day wraps.
|
|
|
|
|
*/
|
|
|
|
|
dir = loc->tm_year - gmt->tm_year;
|
|
|
|
|
if (dir == 0)
|
|
|
|
|
dir = loc->tm_yday - gmt->tm_yday;
|
|
|
|
|
dt += dir * 24 * 60 * 60;
|
|
|
|
|
|
|
|
|
|
return (dt);
|
|
|
|
|
}
|
