//
// Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
//
-// This program is free software; you can redistribute it and/or
-// modify it under the terms of the GNU General Public License as
-// published by the Free Software Foundation; either version 2 of the
-// License, or (at your option) any later version.
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Library General Public
+// License as published by the Free Software Foundation; either
+// version 2 of the License, or (at your option) any later version.
//
-// This program is distributed in the hope that it will be useful, but
-// WITHOUT ANY WARRANTY; without even the implied warranty of
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-// General Public License for more details.
+// Library General Public License for more details.
//
-// 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+// 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.
//
// $Id$
#ifdef HAVE_CONFIG_H
-# include <config.h>
+# include <simgear_config.h>
#endif
#include <simgear/compiler.h>
-#ifdef FG_HAVE_STD_INCLUDES
-# include <cmath>
+#include <errno.h> // for errno
+
+#ifdef SG_HAVE_STD_INCLUDES
# include <cstdio>
# include <cstdlib>
# include <ctime>
# include <math.h>
# include <stdio.h>
# include <stdlib.h>
-# include <time.h>
#endif
+#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 <simgear/constants.h>
#include <simgear/debug/logstream.hxx>
-#include <simgear/misc/fgpath.hxx>
+#include <simgear/misc/sg_path.hxx>
#include "sg_time.hxx"
#include "timezone.h"
#define DEGHR(x) ((x)/15.)
-#define RADHR(x) DEGHR(x*RAD_TO_DEG)
-
+#define RADHR(x) DEGHR(x*SGD_RADIANS_TO_DEGREES)
-SGTime::SGTime( const string& root )
-{
- if (cur_time_params) {
- FG_LOG( FG_GENERAL, FG_ALERT,
- "Error: only one instance of SGTime allowed" );
- exit(-1);
- }
- cur_time_params = this;
+static const double MJD0 = 2415020.0;
+static const double J2000 = 2451545.0 - MJD0;
+static const double SIDRATE = 0.9972695677;
- FGPath zone( root );
- zone.append( "Timezone" );
- zone.append( "zone.tab" );
- FG_LOG( FG_EVENT, FG_DEBUG, "Reading timezone info from: " << zone.str() );
- tzContainer = new TimezoneContainer( zone.c_str() );
-
- zonename = NULL;
-}
+void SGTime::init( double lon, double lat,
+ const string& root, time_t init_time )
+{
+ SG_LOG( SG_EVENT, SG_INFO, "Initializing Time" );
+ gst_diff = -9999.0;
-SGTime::~SGTime()
-{
- delete tzContainer;
+ if ( init_time ) {
+ cur_time = init_time;
+ } else {
+ cur_time = time(NULL);
+ }
- if ( zonename != NULL ) {
- delete zonename;
+ cout << "Current greenwich mean time = " << asctime(gmtime(&cur_time))
+ << endl;
+ cout << "Current local time = "
+ << asctime(localtime(&cur_time)) << endl;
+
+ if ( root != (string)"" ) {
+ 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);
+
+ SGPath name( root );
+ name.append( nearestTz->getDescription() );
+ zonename = strdup( name.c_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;
}
}
-void SGTime::updateLocal( double lon, double lat, const string& root )
+SGTime::SGTime( double lon, double lat, const string& root, time_t init_time )
{
- time_t currGMT;
- time_t aircraftLocalTime;
- GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
- GeoCoord* nearestTz = tzContainer->getNearest(location);
- FGPath zone( root );
- zone.append ("Timezone" );
- zone.append ( nearestTz->getDescription() );
- if ( zonename ) {
- delete zonename;
- }
- zonename = strdup( zone.c_str() );
- currGMT = get_gmt( gmtime(&cur_time) );
- aircraftLocalTime = get_gmt( (fgLocaltime(&cur_time, zone.c_str())) );
- local_offset = aircraftLocalTime - currGMT;
- // cout << "Using " << local_offset << " as local time offset Timezone is "
- // << zonename << endl;
+ init( lon, lat, root, init_time );
}
-// Initialize the time dependent variables (maybe I'll put this in the
-// constructor later)
-void SGTime::init( double lon, double lat, const string& root )
-// time_t timeOffset, sgTimingOffsetType offsetType )
-{
- FG_LOG( FG_EVENT, FG_INFO, "Initializing Time" );
- gst_diff = -9999.0;
-
- // time_t currGMT;
- // time_t systemLocalTime;
- // time_t aircraftLocalTime;
-
- // would it be better to put these sanity checks in the options
- // parsing code? (CLO)
- cur_time = time(NULL);
-
- // printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- // printf ("Current local time = %24s", asctime(localtime(&cur_time)));
- // time_t tmp = cur_time;
- GeoCoord location( RAD_TO_DEG * lat, RAD_TO_DEG * lon );
-
- GeoCoord* nearestTz = tzContainer->getNearest(location);
-
- FGPath zone( root );
- zone.append( "Timezone" );
- zone.append( nearestTz->getDescription() );
-
- // cout << "Using " << zone.str() << " for timezone information" << endl;
- zonename = strdup( zone.c_str() );
- // cout << "zonename = " << zonename << endl;
- //show( buffer.c_str(), cur_time, 1);
- //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
- // currGMT = get_gmt( gmtime(&cur_time) );
- // cout << "currGMT = " << currGMT << endl;
-
- // systemLocalTime = get_gmt( localtime(&cur_time) );
- // cout << "systemLocalTime = " << systemLocalTime << endl;
-
- // aircraftLocalTime = get_gmt( fgLocaltime(&cur_time, zone.c_str()) );
- //printf ("Current greenwich mean time = %24s", asctime(gmtime(&cur_time)));
- //printf ("Current local time = %24s", asctime(localtime(&cur_time)));
+SGTime::SGTime( const string& root ) {
+ init( 0.0, 0.0, root, 0 );
}
-// given a date in months, mn, days, dy, years, yr, return the
-// modified Julian date (number of days elapsed since 1900 jan 0.5),
-// mjd. Adapted from Xephem.
-
-void SGTime::cal_mjd (int mn, double dy, int yr)
-{
- //static double last_mjd, last_dy;
- //double mjd;
- //static int last_mn, last_yr;
- int b, d, m, y;
- long c;
-
- if (mn == last_mn && yr == last_yr && dy == last_dy) {
- mjd = last_mjd;
- }
-
- m = mn;
- y = (yr < 0) ? yr + 1 : yr;
- if (mn < 3) {
- m += 12;
- y -= 1;
- }
-
- if (yr < 1582 || (yr == 1582 && (mn < 10 || (mn == 10 && dy < 15)))) {
- b = 0;
- } else {
- int a;
- a = y/100;
- b = 2 - a + a/4;
- }
-
- if (y < 0) {
- c = (long)((365.25*y) - 0.75) - 694025L;
- } else {
- c = (long)(365.25*y) - 694025L;
- }
-
- d = (int)(30.6001*(m+1));
-
- mjd = b + c + d + dy - 0.5;
-
- last_mn = mn;
- last_dy = dy;
- last_yr = yr;
- last_mjd = mjd;
+SGTime::SGTime() {
+ init( 0.0, 0.0, "", 0 );
}
-// given an mjd, calculate greenwich mean sidereal time, gst
-void SGTime::utc_gst ()
+SGTime::~SGTime()
{
- double day = floor(mjd-0.5)+0.5;
- double hr = (mjd-day)*24.0;
- double T, x;
-
- T = ((int)(mjd - 0.5) + 0.5 - J2000)/36525.0;
- x = 24110.54841 + (8640184.812866 + (0.093104 - 6.2e-6 * T) * T) * T;
- x /= 3600.0;
- gst = (1.0/SIDRATE)*hr + x;
+ if ( tzContainer != NULL ) {
+ TimezoneContainer *tmp = tzContainer;
+ tzContainer = NULL;
+ delete tmp;
+ }
- FG_LOG( FG_EVENT, FG_DEBUG, " gst => " << gst );
+ if ( zonename != NULL ) {
+ char *tmp = zonename;
+ zonename = NULL;
+ free(tmp);
+ }
}
// Local Sidereal Time, in decimal hours.
//
// Provided courtesy of ecdowney@noao.edu (Elwood Downey)
-
-double SGTime::sidereal_precise (double lng)
+static double sidereal_precise( double mjd, double lng )
{
- double lstTmp;
-
/* printf ("Current Lst on JD %13.5f at %8.4f degrees West: ",
mjd + MJD0, lng); */
// convert to required internal units
- lng *= DEG_TO_RAD;
+ lng *= SGD_DEGREES_TO_RADIANS;
// compute LST and print
- utc_gst();
- lstTmp = gst - RADHR (lng);
- lstTmp -= 24.0*floor(lstTmp/24.0);
+ double gst = sgTimeCalcGST( mjd );
+ double lst = gst - RADHR( lng );
+ lst -= 24.0 * floor( lst / 24.0 );
// printf ("%7.4f\n", lstTmp);
- // that's all
- return (lstTmp);
+ return lst;
}
// return a courser but cheaper estimate of sidereal time
-double SGTime::sidereal_course(double lng)
+static double sidereal_course( time_t cur_time, const struct tm *gmt, double lng )
{
- //struct tm *gmt;
- //double lstTmp;
time_t start_gmt, now;
double diff, part, days, hours, lstTmp;
char tbuf[64];
- //gmt = t->gmt;
- //now = t->cur_time;
now = cur_time;
- start_gmt = get_gmt(gmt->tm_year, 2, 21, 12, 0, 0);
+ start_gmt = sgTimeGetGMT(gmt->tm_year, 2, 21, 12, 0, 0);
- FG_LOG( FG_EVENT, FG_DEBUG, " COURSE: GMT = " << format_time(gmt, tbuf) );
- FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (GMT) = " << start_gmt );
+ SG_LOG( SG_EVENT, SG_DEBUG, " COURSE: GMT = "
+ << sgTimeFormatTime(gmt, tbuf) );
+ SG_LOG( SG_EVENT, SG_DEBUG, " March 21 noon (GMT) = " << start_gmt );
diff = (now - start_gmt) / (3600.0 * 24.0);
- FG_LOG( FG_EVENT, FG_DEBUG,
+ SG_LOG( SG_EVENT, SG_DEBUG,
" Time since 3/21/" << gmt->tm_year << " GMT = " << diff );
part = fmod(diff, 1.0);
lstTmp += 24.0;
}
- FG_LOG( FG_EVENT, FG_DEBUG,
+ SG_LOG( SG_EVENT, SG_DEBUG,
" days = " << days << " hours = " << hours << " lon = "
<< lng << " lst = " << lstTmp );
- return(lstTmp);
+ return lstTmp;
}
-// Update time variables such as gmt, julian date, and sidereal time
-void SGTime::update( double lon, double lat, double alt_m, long int warp ) {
+// Update the time related variables
+void SGTime::update( double lon, double lat, time_t ct, long int warp ) {
double gst_precise, gst_course;
- FG_LOG( FG_EVENT, FG_DEBUG, "Updating time" );
+#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;
- FG_LOG( FG_EVENT, FG_DEBUG,
+ 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);
- FG_LOG( FG_EVENT, FG_DEBUG,
+#endif
+ SG_LOG( SG_EVENT, SG_DEBUG,
" Current GMT = " << gmt->tm_mon+1 << "/"
- << gmt->tm_mday << "/" << gmt->tm_year << " "
+ << gmt->tm_mday << "/" << (1900 + gmt->tm_year) << " "
<< gmt->tm_hour << ":" << gmt->tm_min << ":"
<< gmt->tm_sec );
- // calculate modified Julian date
- // t->mjd = cal_mjd ((int)(t->gmt->tm_mon+1), (double)t->gmt->tm_mday,
- // (int)(t->gmt->tm_year + 1900));
- cal_mjd ((int)(gmt->tm_mon+1), (double)gmt->tm_mday,
- (int)(gmt->tm_year + 1900));
+ // calculate modified Julian date starting with current
+ mjd = sgTimeCurrentMJD( ct, warp );
// add in partial day
mjd += (gmt->tm_hour / 24.0) + (gmt->tm_min / (24.0 * 60.0)) +
// convert "back" to Julian date + partial day (as a fraction of one)
jd = mjd + MJD0;
- FG_LOG( FG_EVENT, FG_DEBUG, " Current Julian Date = " << jd );
+ SG_LOG( SG_EVENT, SG_DEBUG, " Current Julian Date = " << jd );
- // printf(" Current Longitude = %.3f\n", FG_Longitude * RAD_TO_DEG);
+ // printf(" Current Longitude = %.3f\n", FG_Longitude * SGD_RADIANS_TO_DEGREES);
// Calculate local side real time
if ( gst_diff < -100.0 ) {
// first time through do the expensive calculation & cheap
// calculation to get the difference.
- FG_LOG( FG_EVENT, FG_INFO, " First time, doing precise gst" );
- gst_precise = gst = sidereal_precise(0.00);
- gst_course = sidereal_course(0.00);
+ SG_LOG( SG_EVENT, SG_INFO, " First time, doing precise gst" );
+ gst_precise = gst = sidereal_precise( mjd, 0.00 );
+ gst_course = sidereal_course( cur_time, gmt, 0.00 );
gst_diff = gst_precise - gst_course;
- lst = sidereal_course(-(lon * RAD_TO_DEG)) + gst_diff;
+ lst = sidereal_course( cur_time, gmt, -(lon * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
} else {
// course + difference should drift off very slowly
- gst = sidereal_course( 0.00 ) + gst_diff;
- lst = sidereal_course( -(lon * RAD_TO_DEG)) + gst_diff;
+ gst = sidereal_course( cur_time, gmt, 0.00 ) + gst_diff;
+ lst = sidereal_course( cur_time, gmt, -(lon * SGD_RADIANS_TO_DEGREES) ) + gst_diff;
}
- FG_LOG( FG_EVENT, FG_DEBUG,
+ SG_LOG( SG_EVENT, SG_DEBUG,
" Current lon=0.00 Sidereal Time = " << gst );
- FG_LOG( FG_EVENT, FG_DEBUG,
+ SG_LOG( SG_EVENT, SG_DEBUG,
" Current LOCAL Sidereal Time = " << lst << " ("
- << sidereal_precise(-(lon * RAD_TO_DEG))
+ << sidereal_precise( mjd, -(lon * 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 ) {
+ // sanity checking
+ if ( lon < -SGD_PI || lon > SGD_PI ) {
+ // not within -180 ... 180
+ lon = 0.0;
+ }
+ if ( lat < -SGD_PI * 0.5 || lat > SGD_PI * 0.5 ) {
+ // not within -90 ... 90
+ lat = 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 ( lat != lat ) {
+ // only true if lat == nan
+ SG_LOG( SG_EVENT, SG_ALERT, " Detected lat == nan, resetting to 0.0" );
+ lat = 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);
+ SGPath zone( root );
+ zone.append ( nearestTz->getDescription() );
+ if ( zonename ) {
+ char *ptr = zonename;
+ zonename = NULL;
+ free(ptr);
+ }
+ zonename = strdup( zone.c_str() );
+
+ //Avoid troubles when zone.tab hasn't got the right line endings
+ if (zonename[strlen(zonename)-1] == '\r')
+ {
+ zonename[strlen(zonename)-1]=0;
+ zone.set( zonename );
+ }
+
+ currGMT = sgTimeGetGMT( gmtime(&cur_time) );
+ aircraftLocalTime = sgTimeGetGMT( (fgLocaltime(&cur_time, zone.c_str())) );
+ local_offset = aircraftLocalTime - currGMT;
+ // cout << "Using " << local_offset << " as local time offset Timezone is "
+ // << zonename << endl;
+}
+
+
+// given a date in months, mn, days, dy, years, yr, return the
+// modified Julian date (number of days elapsed since 1900 jan 0.5),
+// mjd. Adapted from Xephem.
+double sgTimeCalcMJD(int mn, double dy, int yr) {
+ double mjd;
+
+ // internal book keeping data
+ static double last_mjd, last_dy;
+ static int last_mn, last_yr;
+
+ int b, d, m, y;
+ long c;
+
+ if (mn == last_mn && yr == last_yr && dy == last_dy) {
+ mjd = last_mjd;
+ }
+
+ m = mn;
+ y = (yr < 0) ? yr + 1 : yr;
+ if (mn < 3) {
+ m += 12;
+ y -= 1;
+ }
+
+ if (yr < 1582 || (yr == 1582 && (mn < 10 || (mn == 10 && dy < 15)))) {
+ b = 0;
+ } else {
+ int a;
+ a = y/100;
+ b = 2 - a + a/4;
+ }
+
+ if (y < 0) {
+ c = (long)((365.25*y) - 0.75) - 694025L;
+ } else {
+ c = (long)(365.25*y) - 694025L;
+ }
+
+ d = (int)(30.6001*(m+1));
+
+ mjd = b + c + d + dy - 0.5;
+
+ last_mn = mn;
+ last_dy = dy;
+ last_yr = yr;
+ last_mjd = mjd;
+
+ return mjd;
+}
+
+
+// return the current modified Julian date (number of days elapsed
+// since 1900 jan 0.5), mjd.
+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
+ struct tm *gmt = &m_gmt;
+#else
+ struct tm *gmt;
+#endif
+
+ // get current Unix calendar time (in seconds)
+ // warp += warp_delta;
+ 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) << " "
+ << gmt->tm_hour << ":" << gmt->tm_min << ":"
+ << gmt->tm_sec );
+
+ // calculate modified Julian date
+ // t->mjd = cal_mjd ((int)(t->gmt->tm_mon+1), (double)t->gmt->tm_mday,
+ // (int)(t->gmt->tm_year + 1900));
+ double mjd = sgTimeCalcMJD( (int)(gmt->tm_mon+1), (double)gmt->tm_mday,
+ (int)(gmt->tm_year + 1900) );
+
+ return mjd;
+}
+
+
+// given an mjd, calculate greenwich mean sidereal time, gst
+double sgTimeCalcGST( double mjd ) {
+ double gst;
+
+ double day = floor(mjd-0.5)+0.5;
+ double hr = (mjd-day)*24.0;
+ double T, x;
+
+ T = ((int)(mjd - 0.5) + 0.5 - J2000)/36525.0;
+ x = 24110.54841 + (8640184.812866 + (0.093104 - 6.2e-6 * T) * T) * T;
+ x /= 3600.0;
+ gst = (1.0/SIDRATE)*hr + x;
+
+ SG_LOG( SG_EVENT, SG_DEBUG, " gst => " << gst );
+
+ return gst;
+}
+
+
+#if defined( HAVE_TIMEGM )
+ // ignore this function
+#elif defined( MK_TIME_IS_GMT )
+ // ignore this function
+#else // ! defined ( MK_TIME_IS_GMT )
+
+ // Fix up timezone if using ftime()
+ static long int fix_up_timezone( long int timezone_orig ) {
+# if !defined( HAVE_GETTIMEOFDAY ) && defined( HAVE_FTIME )
+ // ftime() needs a little extra help finding the current timezone
+ struct timeb current;
+ ftime(¤t);
+ return( current.timezone * 60 );
+# else
+ return( timezone_orig );
+# endif
+ }
+#endif
+
+
/******************************************************************
* The following are some functions that were included as SGTime
* members, although they currently don't make use of any of the
// If you are having problems with incorrectly positioned astronomical
// bodies, this is a really good place to start looking.
-time_t SGTime::get_gmt(int year, int month, int day, int hour, int min, int sec)
+time_t sgTimeGetGMT(int year, int month, int day, int hour, int min, int sec)
{
struct tm mt;
# define MK_TIME_IS_GMT 1
#endif
-#if defined( HAVE_TIMEGM )
+#if defined( HAVE_TIMEGM )
return ( timegm(&mt) );
#elif defined( MK_TIME_IS_GMT )
- return ( mktime(&mt) );
+ time_t ret = mktime(&mt);
+
+#ifdef __CYGWIN__
+ ret -= _timezone;
+#endif
+
+ // This is necessary as some mktime() calls may
+ // try to access the system timezone files
+ // if this open fails errno is set to 2
+ // CYGWIN for one does this
+ // if ( errno ) {
+ // perror( "sgTimeGetGMT()" );
+ // errno = 0;
+ // }
+
+ // reset errno in any event.
+ errno = 0;
+
+ return ret;
#else // ! defined ( MK_TIME_IS_GMT )
// timezone seems to work as a proper offset for Linux & Solaris
-# if defined( __linux__ ) || defined( __sun__ )
+# if defined( __linux__ ) || defined( __sun__ ) ||defined(__CYGWIN__)
# define TIMEZONE_OFFSET_WORKS 1
# endif
- long int start = mktime(&mt);
+#if defined(__CYGWIN__)
+#define TIMEZONE _timezone
+#else
+#define TIMEZONE timezone
+#endif
+
+ time_t start = mktime(&mt);
- FG_LOG( FG_EVENT, FG_DEBUG, "start1 = " << start );
+ SG_LOG( SG_EVENT, SG_DEBUG, "start1 = " << start );
// the ctime() call can screw up time progression on some versions
// of Linux
- // fgPrintf( FG_EVENT, FG_DEBUG, "start2 = %s", ctime(&start));
- FG_LOG( FG_EVENT, FG_DEBUG, "(tm_isdst = " << mt.tm_isdst << ")" );
+ // fgPrintf( SG_EVENT, SG_DEBUG, "start2 = %s", ctime(&start));
+ SG_LOG( SG_EVENT, SG_DEBUG, "(tm_isdst = " << mt.tm_isdst << ")" );
- timezone = fix_up_timezone( timezone );
+ TIMEZONE = fix_up_timezone( TIMEZONE );
# if defined( TIMEZONE_OFFSET_WORKS )
- FG_LOG( FG_EVENT, FG_DEBUG,
- "start = " << start << ", timezone = " << timezone );
- return( start - timezone );
+ SG_LOG( SG_EVENT, SG_DEBUG,
+ "start = " << start << ", timezone = " << TIMEZONE );
+ return( start - TIMEZONE );
# else // ! defined( TIMEZONE_OFFSET_WORKS )
daylight = mt.tm_isdst;
if ( daylight > 0 ) {
daylight = 1;
} else if ( daylight < 0 ) {
- FG_LOG( FG_EVENT, FG_WARN,
+ SG_LOG( SG_EVENT, FG_WARN,
"OOOPS, problem in sg_time.cxx, no daylight savings info." );
}
- long int offset = -(timezone / 3600 - daylight);
+ long int offset = -(TIMEZONE / 3600 - daylight);
- FG_LOG( FG_EVENT, FG_DEBUG, " Raw time zone offset = " << timezone );
- FG_LOG( FG_EVENT, FG_DEBUG, " Daylight Savings = " << daylight );
- FG_LOG( FG_EVENT, FG_DEBUG, " Local hours from GMT = " << offset );
+ SG_LOG( SG_EVENT, SG_DEBUG, " Raw time zone offset = " << TIMEZONE );
+ SG_LOG( SG_EVENT, SG_DEBUG, " Daylight Savings = " << daylight );
+ SG_LOG( SG_EVENT, SG_DEBUG, " Local hours from GMT = " << offset );
- long int start_gmt = start - timezone + (daylight * 3600);
+ long int start_gmt = start - TIMEZONE + (daylight * 3600);
- FG_LOG( FG_EVENT, FG_DEBUG, " March 21 noon (CST) = " << start );
+ SG_LOG( SG_EVENT, SG_DEBUG, " March 21 noon (CST) = " << start );
return ( start_gmt );
# endif // ! defined( TIMEZONE_OFFSET_WORKS )
#endif // ! defined ( MK_TIME_IS_GMT )
}
-// Fix up timezone if using ftime()
-long int SGTime::fix_up_timezone( long int timezone_orig )
-{
-#if !defined( HAVE_GETTIMEOFDAY ) && defined( HAVE_FTIME )
- // ftime() needs a little extra help finding the current timezone
- struct timeb current;
- ftime(¤t);
- return( current.timezone * 60 );
-#else
- return( timezone_orig );
-#endif
-}
-
-char* SGTime::format_time( const struct tm* p, char* buf )
+// format time
+char* sgTimeFormatTime( const struct tm* p, char* buf )
{
sprintf( buf, "%d/%d/%2d %d:%02d:%02d",
p->tm_mon, p->tm_mday, p->tm_year,
p->tm_hour, p->tm_min, p->tm_sec);
return buf;
}
-
-
-SGTime* SGTime::cur_time_params = 0;
projects / simgear.git / blobdiff