12949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project/* 22949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * Copyright (c) 1997 32949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * The Regents of the University of California. All rights reserved. 42949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * 52949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * Redistribution and use in source and binary forms, with or without 62949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * modification, are permitted provided that: (1) source code distributions 72949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * retain the above copyright notice and this paragraph in its entirety, (2) 82949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * distributions including binary code include the above copyright notice and 92949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * this paragraph in its entirety in the documentation or other materials 102949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * provided with the distribution, and (3) all advertising materials mentioning 112949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * features or use of this software display the following acknowledgement: 122949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * ``This product includes software developed by the University of California, 132949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of 142949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * the University nor the names of its contributors may be used to endorse 152949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * or promote products derived from this software without specific prior 162949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * written permission. 172949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED 182949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF 192949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. 202949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project */ 212949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 222949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#ifndef lint 232949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Projectstatic const char rcsid[] _U_ = 2453f17a9db278d33517d9888dd77848f554522a38JP Abgrall "@(#) $Header: /tcpdump/master/tcpdump/gmt2local.c,v 1.9 2003-11-16 09:36:09 guy Exp $ (LBL)"; 252949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#endif 262949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 272949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#ifdef HAVE_CONFIG_H 282949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#include "config.h" 292949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#endif 302949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 312949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#include <tcpdump-stdinc.h> 322949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 332949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#include <stdio.h> 342949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 352949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#ifdef HAVE_OS_PROTO_H 362949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#include "os-proto.h" 372949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#endif 382949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 392949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project#include "gmt2local.h" 402949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 412949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project/* 422949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * Returns the difference between gmt and local time in seconds. 432949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * Use gmtime() and localtime() to keep things simple. 442949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project */ 452949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Projectint32_t 462949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Projectgmt2local(time_t t) 472949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project{ 482949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project register int dt, dir; 492949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project register struct tm *gmt, *loc; 502949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project struct tm sgmt; 512949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 522949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project if (t == 0) 532949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project t = time(NULL); 542949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project gmt = &sgmt; 552949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project *gmt = *gmtime(&t); 562949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project loc = localtime(&t); 572949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project dt = (loc->tm_hour - gmt->tm_hour) * 60 * 60 + 582949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project (loc->tm_min - gmt->tm_min) * 60; 592949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 602949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project /* 612949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * If the year or julian day is different, we span 00:00 GMT 622949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * and must add or subtract a day. Check the year first to 632949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project * avoid problems when the julian day wraps. 642949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project */ 652949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project dir = loc->tm_year - gmt->tm_year; 662949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project if (dir == 0) 672949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project dir = loc->tm_yday - gmt->tm_yday; 682949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project dt += dir * 24 * 60 * 60; 692949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project 702949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project return (dt); 712949f58a438f6fd85f66a8b7ed4708042cde4b37The Android Open Source Project} 72