//
// Written by Curtis Olson, started August 1997.
//
-// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
+// Copyright (C) 1997 Curtis L. Olson - http://www.flightgear.org/~curt
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Library General Public License for more details.
//
-// You should have received a copy of the GNU Library General Public
-// License along with this library; if not, write to the
-// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
-// Boston, MA 02111-1307, USA.
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// $Id$
#include <errno.h> // for errno
-#ifdef SG_HAVE_STD_INCLUDES
-# include <cstdio>
-# include <cstdlib>
-# include <ctime>
-#else
-# include <math.h>
-# include <stdio.h>
-# include <stdlib.h>
-#endif
+#include <cstdio>
+#include <cstdlib>
+#include <ctime>
+#include <cstring>
+
+#include <string>
+#ifdef HAVE_SYS_TIME_H
+# include <sys/time.h> // for get/setitimer, gettimeofday, struct timeval
+#endif
#ifdef HAVE_SYS_TIMEB_H
# include <sys/timeb.h> // for ftime() and struct timeb
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h> // for gettimeofday()
#endif
-#ifdef HAVE_SYS_TIME_H
-# include <sys/time.h> // for get/setitimer, gettimeofday, struct timeval
-#endif
#include <math.h> // for NAN
#include "timezone.h"
#include "lowleveltime.h"
-
#define DEGHR(x) ((x)/15.)
#define RADHR(x) DEGHR(x*SGD_RADIANS_TO_DEGREES)
+using std::string;
static const double MJD0 = 2415020.0;
static const double J2000 = 2451545.0 - MJD0;
static const double SIDRATE = 0.9972695677;
-SGTime::SGTime( double lon, double lat, const string& root )
+void SGTime::init( double lon_rad, double lat_rad,
+ const string& root, time_t init_time )
{
SG_LOG( SG_EVENT, SG_INFO, "Initializing Time" );
gst_diff = -9999.0;
- cur_time = time(NULL);
- cout << "Current greenwich mean time = " << asctime(gmtime(&cur_time))
- << endl;
- cout << "Current local time = "
- << asctime(localtime(&cur_time)) << endl;
+ if ( init_time ) {
+ cur_time = init_time;
+ } else {
+ cur_time = time(NULL);
+ }
+
+ SG_LOG( SG_EVENT, SG_INFO,
+ "Current greenwich mean time = " << asctime(gmtime(&cur_time)));
+ SG_LOG( SG_EVENT, SG_INFO,
+ "Current local time = " << asctime(localtime(&cur_time)));
- if ( root != (string)"" ) {
+ if ( !root.empty()) {
SGPath zone( root );
zone.append( "zone.tab" );
SG_LOG( SG_EVENT, SG_INFO, "Reading timezone info from: "
<< zone.str() );
- tzContainer = new TimezoneContainer( zone.c_str() );
-
- GeoCoord location( SGD_RADIANS_TO_DEGREES * lat, SGD_RADIANS_TO_DEGREES * lon );
- GeoCoord* nearestTz = tzContainer->getNearest(location);
+ tzContainer = new SGTimeZoneContainer( zone.c_str() );
+ SGGeod location(SGGeod::fromRad(lon_rad, lat_rad));
+ SGTimeZone* nearestTz = tzContainer->getNearest(location);
SGPath name( root );
name.append( nearestTz->getDescription() );
- zonename = strdup( name.c_str() );
+ zonename = name.str();
SG_LOG( SG_EVENT, SG_INFO, "Using zonename = " << zonename );
} else {
SG_LOG( SG_EVENT, SG_INFO, "*** NO TIME ZONE NAME ***" );
tzContainer = NULL;
- zonename = NULL;
+ zonename.erase();
}
}
+SGTime::SGTime( double lon_rad, double lat_rad, const string& root,
+ time_t init_time )
+{
+ init( lon_rad, lat_rad, root, init_time );
+}
+
SGTime::SGTime( const string& root ) {
- SGTime( 0.0, 0.0, root );
+ init( 0.0, 0.0, root, 0 );
}
SGTime::SGTime() {
- SGTime( 0.0, 0.0, "" );
+ init( 0.0, 0.0, "", 0 );
}
SGTime::~SGTime()
{
- if ( tzContainer != NULL ) {
- TimezoneContainer *tmp = tzContainer;
- tzContainer = NULL;
- delete tmp;
- }
-
- if ( zonename != NULL ) {
- char *tmp = zonename;
- zonename = NULL;
- delete tmp;
- }
+ delete tzContainer;
}
// return a courser but cheaper estimate of sidereal time
-static double sidereal_course( time_t cur_time, struct tm *gmt, double lng )
+static double sidereal_course( time_t cur_time, const struct tm *gmt, double lng )
{
time_t start_gmt, now;
double diff, part, days, hours, lstTmp;
// Update the time related variables
-void SGTime::update( double lon, double lat, long int warp ) {
+void SGTime::update( double lon_rad, double lat_rad,
+ time_t ct, long int warp )
+{
double gst_precise, gst_course;
-#if defined(_MSC_VER) || defined(__MINGW32__)
+
tm * gmt = &m_gmt;
-#endif
+
SG_LOG( SG_EVENT, SG_DEBUG, "Updating time" );
// get current Unix calendar time (in seconds)
// warp += warp_delta;
- cur_time = time(NULL) + warp;
+ if ( ct ) {
+ cur_time = ct + warp;
+ } else {
+ cur_time = time(NULL) + warp;
+ }
SG_LOG( SG_EVENT, SG_DEBUG,
" Current Unix calendar time = " << cur_time
<< " warp = " << warp );
// get GMT break down for current time
-#if defined(_MSC_VER) || defined(__MINGW32__)
+
memcpy( gmt, gmtime(&cur_time), sizeof(tm) );
-#else
- gmt = gmtime(&cur_time);
-#endif
SG_LOG( SG_EVENT, SG_DEBUG,
" Current GMT = " << gmt->tm_mon+1 << "/"
<< gmt->tm_mday << "/" << (1900 + gmt->tm_year) << " "
<< gmt->tm_sec );
// calculate modified Julian date starting with current
- mjd = sgTimeCurrentMJD( warp );
+ mjd = sgTimeCurrentMJD( ct, warp );
// add in partial day
mjd += (gmt->tm_hour / 24.0) + (gmt->tm_min / (24.0 * 60.0)) +
gst_diff = gst_precise - gst_course;
- lst = sidereal_course( cur_time, gmt, -(lon * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
+ lst = sidereal_course( cur_time, gmt,
+ -(lon_rad * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
} else {
// course + difference should drift off very slowly
gst = sidereal_course( cur_time, gmt, 0.00 ) + gst_diff;
- lst = sidereal_course( cur_time, gmt, -(lon * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
+ lst = sidereal_course( cur_time, gmt,
+ -(lon_rad * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
}
SG_LOG( SG_EVENT, SG_DEBUG,
" Current lon=0.00 Sidereal Time = " << gst );
SG_LOG( SG_EVENT, SG_DEBUG,
" Current LOCAL Sidereal Time = " << lst << " ("
- << sidereal_precise( mjd, -(lon * SGD_RADIANS_TO_DEGREES) )
+ << sidereal_precise( mjd, -(lon_rad * SGD_RADIANS_TO_DEGREES) )
<< ") (diff = " << gst_diff << ")" );
}
// Given lon/lat, update timezone information and local_offset
-void SGTime::updateLocal( double lon, double lat, const string& root ) {
+void SGTime::updateLocal( double lon_rad, double lat_rad, const string& root ) {
// sanity checking
- if ( lon < SGD_PI || lon > SGD_PI ) {
+ if ( lon_rad < -SGD_PI || lon_rad> SGD_PI ) {
// not within -180 ... 180
- lon = 0.0;
+ lon_rad = 0.0;
}
- if ( lat < SGD_PI * 0.5 || lat > SGD_PI * 0.5 ) {
+ if ( lat_rad < -SGD_PI_2 || lat_rad > SGD_PI_2 ) {
// not within -90 ... 90
- lat = 0.0;
+ lat_rad = 0.0;
}
- if ( lon != lon ) {
- // only true if lon == nan
- SG_LOG( SG_EVENT, SG_ALERT, " Detected lon == nan, resetting to 0.0" );
- lon = 0.0;
+ if ( lon_rad != lon_rad ) {
+ // only true if lon_rad == nan
+ SG_LOG( SG_EVENT, SG_ALERT,
+ " Detected lon_rad == nan, resetting to 0.0" );
+ lon_rad = 0.0;
}
- if ( lat != lat ) {
- // only true if lat == nan
- SG_LOG( SG_EVENT, SG_ALERT, " Detected lat == nan, resetting to 0.0" );
- lat = 0.0;
+ if ( lat_rad != lat_rad ) {
+ // only true if lat_rad == nan
+ SG_LOG( SG_EVENT, SG_ALERT,
+ " Detected lat_rad == nan, resetting to 0.0" );
+ lat_rad = 0.0;
}
time_t currGMT;
time_t aircraftLocalTime;
- GeoCoord location( SGD_RADIANS_TO_DEGREES * lat, SGD_RADIANS_TO_DEGREES * lon );
- GeoCoord* nearestTz = tzContainer->getNearest(location);
+ SGGeod location(SGGeod::fromRad(lon_rad, lat_rad));
+ SGTimeZone* nearestTz = tzContainer->getNearest(location);
SGPath zone( root );
zone.append ( nearestTz->getDescription() );
- if ( zonename ) {
- char *ptr = zonename;
- zonename = NULL;
- delete ptr;
- }
- zonename = strdup( zone.c_str() );
+ zonename = zone.str();
//Avoid troubles when zone.tab hasn't got the right line endings
- if (zonename[strlen(zonename)-1] == '\r')
+ if (zonename[zonename.size()-1] == '\r')
{
- zonename[strlen(zonename)-1]=0;
+ zonename[zonename.size()-1]=0;
zone.set( zonename );
}
// return the current modified Julian date (number of days elapsed
// since 1900 jan 0.5), mjd.
-double sgTimeCurrentMJD( long int warp ) {
+double sgTimeCurrentMJD( time_t ct, long int warp ) {
-#if defined(_MSC_VER) || defined(__MINGW32__)
struct tm m_gmt; // copy of system gmtime(&time_t) structure
-#else
- struct tm *gmt;
-#endif
-
-#if defined(_MSC_VER) || defined(__MINGW32__)
- tm * gmt = &m_gmt;
-#endif
+ struct tm *gmt = &m_gmt;
// get current Unix calendar time (in seconds)
// warp += warp_delta;
- time_t cur_time = time(NULL) + warp;
+ time_t cur_time;
+ if ( ct ) {
+ cur_time = ct + warp;
+ } else {
+ cur_time = time(NULL) + warp;
+ }
SG_LOG( SG_EVENT, SG_DEBUG,
" Current Unix calendar time = " << cur_time
<< " warp = " << warp );
// get GMT break down for current time
-#if defined(_MSC_VER) || defined(__MINGW32__)
memcpy( gmt, gmtime(&cur_time), sizeof(tm) );
-#else
- gmt = gmtime(&cur_time);
-#endif
SG_LOG( SG_EVENT, SG_DEBUG,
" Current GMT = " << gmt->tm_mon+1 << "/"
<< gmt->tm_mday << "/" << (1900 + gmt->tm_year) << " "
#else // ! defined ( MK_TIME_IS_GMT )
// timezone seems to work as a proper offset for Linux & Solaris
-# if defined( __linux__ ) || defined( __sun__ ) ||defined(__CYGWIN__)
+# if defined( __linux__ ) || defined(__sun) ||defined(__CYGWIN__)
# define TIMEZONE_OFFSET_WORKS 1
# endif
if ( daylight > 0 ) {
daylight = 1;
} else if ( daylight < 0 ) {
- SG_LOG( SG_EVENT, FG_WARN,
+ SG_LOG( SG_EVENT, SG_WARN,
"OOOPS, problem in sg_time.cxx, no daylight savings info." );
}
projects / simgear.git / blobdiff