svn commit: r1380501 [4/4] - in /xalan/c/branches/GSoC-2012: Projects/Win32/VC10/ Projects/Win32/VC10/AllInOne/ Projects/Win32/VC10/TestDatesAndTimes/ samples/TestDatesAndTimes/ src/xalanc/XalanDateTime/

[sh...@apache.org]

Added: xalan/c/branches/GSoC-2012/src/xalanc/XalanDateTime/XalanSystemClock.hpp
URL: http://svn.apache.org/viewvc/xalan/c/branches/GSoC-2012/src/xalanc/XalanDateTime/XalanSystemClock.hpp?rev=1380501&view=auto
==============================================================================
--- xalan/c/branches/GSoC-2012/src/xalanc/XalanDateTime/XalanSystemClock.hpp (added)
+++ xalan/c/branches/GSoC-2012/src/xalanc/XalanDateTime/XalanSystemClock.hpp Tue Sep  4 09:25:11 2012
@@ -0,0 +1,114 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the  "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* The memcpy routine is defined in <string.h>
+ * The time routines and structures are defined in <time.h>
+ */
+
+#include <iostream>
+#include <time.h>
+#include <math.h>
+
+class XalanSystemClock
+{
+
+public:
+
+    /* NOTES
+     *  time_t may be vulnerable to wrap-around in year 2034. 
+     * There is no current standard 'C' replacement for <time.h> routines.
+     * Various operating systems have their own thread-safe replacements.
+     * Various operating systems handle wrap-around differently.
+     */
+
+    /* COMPATIBILITY, these 'C' routines are compatible with all
+     * POSIX platforms and
+     * WINDOWS platforms
+     * There may be some thread-unsafe notices when compiled on some systems.
+     */
+
+    /*
+     * Return Value -1 = parameter error
+     * Return Value 0 = success
+     *
+     * @param tp pointer to a type struct tm, to receive broken-down time.
+     * @param tt pointer to a time_t value, to receive seconds since epoc UTC.
+     */
+
+    static int getSystemTimeUTC(struct tm * tmUTC)
+    {
+        if (!tmUTC)
+        {
+            return -1;
+        }
+
+        time_t sys_tt;
+        time(& sys_tt);
+
+        memcpy((void *) tmUTC, (void *) gmtime(& sys_tt), sizeof(struct tm));
+
+        return 0;
+    }
+
+    static int getSystemTimeLocal(struct tm * tmLocal)
+    {
+        if (!tmLocal)
+        {
+            return -1;
+        }
+
+        time_t sys_tt;
+        time(& sys_tt);
+
+        memcpy((void *) tmLocal, (void *) localtime(& sys_tt), sizeof(struct tm));
+
+        return 0;
+    }
+
+    static char * getLocalTimeZone(struct tm * tmLocal, struct tm * tmUTC)
+    {
+        int hour = 0;
+        int minute = 0;
+
+        hour += tmLocal->tm_hour - tmUTC->tm_hour;
+        hour += tmLocal->tm_mday > tmUTC->tm_mday ? 24
+            : tmLocal->tm_mday < tmUTC->tm_mday ? -24 : 0;
+
+        minute = tmLocal->tm_min - tmUTC->tm_min;
+        
+        if (hour + minute)
+        {
+            if ((hour > 0 && minute < 0)
+                || (hour < 0 && minute > 0))
+            {
+                hour += hour > 0 ? -1 : 1;
+                minute = abs(minute) % 60;
+            }
+
+            char * timezone = new char[6];
+
+            sprintf((hour > 0 && (*timezone = '+')) || (*timezone = '-') ? timezone + 1 : timezone,
+                "%02d:%02d", abs(hour), minute);
+
+            return timezone;
+        }
+
+        return "Z";
+    }
+
+};
\ No newline at end of file



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