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2022-10-20 20:29:11 +08:00
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+// test the systems mktime() function
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif
+
+#ifdef HAVE_WINDOWS_H
+#  include <windows.h>
+#endif
+
+#include <math.h>
+#include <stdio.h>
+#include <time.h>
+
+#ifdef HAVE_SYS_TIMEB_H
+#  include <sys/types.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 "test-mktime.hxx"
+
+#define LST_MAGIC_TIME_1998 890481600
+
+// For now we assume that if daylight is not defined in
+// /usr/include/time.h that we have a machine with a BSD behaving
+// mktime()
+#if !defined(HAVE_DAYLIGHT)
+#  define MK_TIME_IS_GMT 1
+#endif
+
+
+// Fix up timezone if using ftime()
+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(&current);
+    return( current.timezone * 60 );
+#else
+    return( timezone_orig );
+#endif
+}
+
+
+// A printout function suitable for the test suite to replace printf().
+int printout(const char *text, ...)
+{
+    std::cout << text;
+    return 0;
+}
+
+
+// Return time_t for Sat Mar 21 12:00:00 GMT
+//
+// I believe the mktime() has a SYSV vs. BSD behavior difference.
+//
+// The BSD style mktime() is nice because it returns its result
+// assuming you have specified the input time in GMT
+//
+// The SYSV style mktime() is a pain because it returns its result
+// assuming you have specified the input time in your local timezone.
+// Therefore you have to go to extra trouble to convert back to GMT.
+//
+// If you are having problems with incorrectly positioned astronomical
+// bodies, this is a really good place to start looking.
+
+time_t get_start_gmt(int year) {
+    struct tm mt;
+
+    mt.tm_mon = 2;
+    mt.tm_mday = 21;
+    mt.tm_year = year;
+    mt.tm_hour = 12;
+    mt.tm_min = 0;
+    mt.tm_sec = 0;
+    mt.tm_isdst = -1; // let the system determine the proper time zone
+
+#if defined( HAVE_TIMEGM ) 
+    return ( timegm(&mt) );
+#elif defined( MK_TIME_IS_GMT )
+    return ( mktime(&mt) );
+#else // ! defined ( MK_TIME_IS_GMT )
+
+    // timezone seems to work as a proper offset for Linux & Solaris
+#  if defined( __linux__ ) || defined(__sun) || defined( __CYGWIN__ )
+#   define TIMEZONE_OFFSET_WORKS 1
+#  endif
+
+#if defined(__CYGWIN__)
+#define TIMEZONE _timezone
+#else
+#define TIMEZONE timezone
+#endif
+
+    time_t start = mktime(&mt);
+
+    printout("start1 = %ld\n", start);
+    printout("start2 = %s", ctime(&start));
+    printout("(tm_isdst = %d)\n", mt.tm_isdst);
+
+    TIMEZONE = fix_up_timezone( TIMEZONE );
+	
+#  if defined( TIMEZONE_OFFSET_WORKS )
+    printout("start = %ld, timezone = %ld\n", start, TIMEZONE);
+    return( start - TIMEZONE );
+#  else // ! defined( TIMEZONE_OFFSET_WORKS )
+
+    daylight = mt.tm_isdst;
+    if ( daylight > 0 ) {
+	daylight = 1;
+    } else if ( daylight < 0 ) {
+	printout("OOOPS, problem in fg_time.cxx, no daylight savings info.\n");
+    }
+
+    long int offset = -(TIMEZONE / 3600 - daylight);
+
+    printout("  Raw time zone offset = %ld\n", TIMEZONE);
+    printout("  Daylight Savings = %d\n", daylight);
+    printout("  Local hours from GMT = %ld\n", offset);
+    
+    long int start_gmt = start - TIMEZONE + (daylight * 3600);
+    
+    printout("  March 21 noon (CST) = %ld\n", start);
+
+    return ( start_gmt );
+#  endif // ! defined( TIMEZONE_OFFSET_WORKS )
+#endif // ! defined ( MK_TIME_IS_GMT )
+}
+
+
+// The original test-mktime test.
+void MktimeTests::testMktime()
+{
+    time_t start_gmt;
+
+    start_gmt = get_start_gmt(98);
+
+
+    if ( start_gmt == LST_MAGIC_TIME_1998 ) {
+	printout("Time test = PASSED\n\n");
+#ifdef HAVE_TIMEGM
+	printout("You have timegm() which is just like mktime() except that\n");
+	printout("it explicitely expects input in GMT ... lucky you!\n");
+#elif MK_TIME_IS_GMT
+	printout("You don't seem to have timegm(), but mktime() seems to\n");
+	printout("assume input is GMT on your system ... I guess that works\n");
+#else
+	printout("mktime() assumes local time zone on your system, but we can\n");
+	printout("compensate just fine.\n");
+#endif
+    } else {
+	printout("Time test = FAILED\n\n");
+	printout("There is likely a problem with mktime() on your system.\n");
+        printout("This will cause the sun/moon/stars/planets to be in the\n");
+	printout("wrong place in the sky and the rendered time of day will be\n");
+	printout("incorrect.\n\n");
+	printout("Please report this to flightgear-devel@lists.sourceforge.net so we can work to fix\n");
+	printout("the problem on your platform.\n");
+    }
+    CPPUNIT_ASSERT_EQUAL(LST_MAGIC_TIME_1998, (int)start_gmt);
+}