[multiple changes]

2004-09-25  Mark Wielaard  <mark@klomp.org>

        * Makefile.am (core_java_source_files): Add VMTimeZone.java.
        (nat_source_files): Rename natTimeZone.cc to natVMTimeZone.cc.
        * Makefile.in: Regenerated.

        * gcj/javaprims.h: Regenerated.

        * java/util/TimeZone.java (defaultZone): Use VMTimeZone.
        (getDefaultTimeZone): Make package private. Check that GMToffset
        contains at least one digit.
        (getDefaultTimeZoneId, readTimeZoneFile, readtzFile): (Re)Moved to
        VMTimeZone.
        * util/VMTimeZone.java: New file with above methods.

        * java/util/natTimeZone.cc: Removed (renamed).
        * java/util/natVMTimeZone.cc: Added (renamed).

2004-09-25  Jeroen Frijters  <jeroen@frijters.net>

        * java/util/TimeZone.java
        (getDefaultTimeZone): Fixed test to distinguish between hours and
        minutes in specified timezone.

From-SVN: r88112

libjava/java/util/natVMTimeZone.cc

@@ -0,0 +1,145 @@
+// natVMTimeZone.cc -- Native side of VMTimeZone class.
+
+/* Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
+   Free Software Foundation
+
+   This file is part of libgcj.
+
+This software is copyrighted work licensed under the terms of the
+Libgcj License.  Please consult the file "LIBGCJ_LICENSE" for
+details.  */
+
+#include <config.h>
+#include <platform.h>
+
+#include <gcj/cni.h>
+#include <jvm.h>
+
+#include <java/util/VMTimeZone.h>
+#include <java/lang/Character.h>
+#include <java/lang/Integer.h>
+
+#include <stdio.h>
+
+#if TIME_WITH_SYS_TIME
+# include <sys/time.h>
+# include <time.h>
+#else
+# if HAVE_SYS_TIME_H
+#  include <sys/time.h>
+# else
+#  include <time.h>
+# endif
+#endif
+
+#include <string.h>
+
+/**
+ * This method returns a time zone id string which is in the form
+ * (standard zone name) or (standard zone name)(GMT offset) or
+ * (standard zone name)(GMT offset)(daylight time zone name).  The
+ * GMT offset can be in seconds, or where it is evenly divisible by
+ * 3600, then it can be in hours.  The offset must be the time to
+ * add to the local time to get GMT.  If a offset is given and the
+ * time zone observes daylight saving then the (daylight time zone
+ * name) must also be given (otherwise it is assumed the time zone
+ * does not observe any daylight savings).
+ * <p>
+ * The result of this method is given to getDefaultTimeZone(String)
+ * which tries to map the time zone id to a known TimeZone.  See
+ * that method on how the returned String is mapped to a real
+ * TimeZone object.
+ */
+jstring
+java::util::VMTimeZone::getSystemTimeZoneId()
+{
+  struct tm tim;
+#ifndef HAVE_LOCALTIME_R
+  struct tm *lt_tim;
+#endif
+#ifdef HAVE_TM_ZONE
+  int month;
+#endif
+  time_t current_time;
+  long tzoffset;
+  const char *tz1, *tz2;
+  char *tzid;
+
+  time(&current_time);
+#ifdef HAVE_LOCALTIME_R
+  localtime_r(&current_time, &tim);
+#else
+  /* Fall back on non-thread safe localtime. */
+  lt_tim = localtime(&current_time);
+  memcpy(&tim, lt_tim, sizeof (struct tm));
+#endif
+  mktime(&tim);
+
+#ifdef HAVE_TM_ZONE
+  /* We will cycle through the months to make sure we hit dst. */
+  month = tim.tm_mon;
+  tz1 = tz2 = NULL;
+  while (tz1 == NULL || tz2 == NULL)
+    {
+      if (tim.tm_isdst > 0)
+        tz2 = tim.tm_zone;
+      else if (tz1 == NULL)
+        {
+          tz1 = tim.tm_zone;
+          month = tim.tm_mon;
+        }
+
+      if (tz1 == NULL || tz2 == NULL)
+        {
+          tim.tm_mon++;
+          tim.tm_mon %= 12;
+        }
+
+      if (tim.tm_mon == month && tz2 == NULL)
+        tz2 = "";
+      else
+        mktime(&tim);
+    }
+  /* We want to make sure the tm struct we use later on is not dst. */
+  tim.tm_mon = month;
+  mktime(&tim);
+#elif defined (HAVE_TZNAME)
+  /* If dst is never used, tzname[1] is the empty string. */
+  tzset();
+  tz1 = tzname[0];
+  tz2 = tzname[1];
+#else
+  /* Some targets have no concept of timezones. Assume GMT without dst. */
+  tz1 = "GMT";
+  tz2 = "";
+#endif
+
+#ifdef STRUCT_TM_HAS_GMTOFF
+  /* tm_gmtoff is the number of seconds that you must add to GMT to get
+     local time, we need the number of seconds to add to the local time
+     to get GMT. */
+  tzoffset = -1L * tim.tm_gmtoff;
+#elif HAVE_UNDERSCORE_TIMEZONE
+  tzoffset = _timezone;
+#elif HAVE_TIMEZONE
+  /* timezone is secs WEST of UTC. */
+  tzoffset = timezone;	
+#else
+  /* FIXME: there must be another global if neither tm_gmtoff nor timezone
+     is available, esp. if tzname is valid.
+     Richard Earnshaw <rearnsha@arm.com> has suggested using difftime to
+     calculate between gmtime and localtime (and accounting for possible
+     daylight savings time) as an alternative. */
+  tzoffset = 0L;
+#endif
+
+  if ((tzoffset % 3600) == 0)
+    tzoffset = tzoffset / 3600;
+
+  tzid = (char*) _Jv_Malloc (strlen(tz1) + strlen(tz2) + 6);
+  sprintf(tzid, "%s%ld%s", tz1, tzoffset, tz2);
+  jstring retval = JvNewStringUTF (tzid);
+  _Jv_Free (tzid);
+
+  return retval;
+}