Some bugfixes

* Fix type error '%u' insted of '%d' for unsigned integer in NTPClient::getUptimeString (AvrNTPClient.cpp)
* Fix memory leak in NTPClient::setNtpServerName (ESPNTPClent.cpp)
* Fix logical error in NTPClient::setTimeZone (AvrNTPClient.cpp)
* Test for for UTC-12:00 => timeZone => UTC+14:00 in NTPClient::setTimeZone (AvrNTPClient.cpp)
    See https://en.wikipedia.org/wiki/Time_zone#List_of_UTC_offsets for valid UTC offsets
* Convenience: Added Visual Studio Code workspace folder to .gitignore

.gitignore

@@ -217,3 +217,6 @@ src/examples/NTPClient/__vm/
 *.sln
 examples/NTPClient/__vm/
 examples/NTPClientESP8266/WifiConfigGM.h
+
+# Visual Studio Code workspace folder
+.vscode/

src/AvrNTPClient.cpp

@@ -68,7 +68,7 @@ boolean sendNTPpacket(IPAddress &address, EthernetUDP udp) {
 	ntpPacketBuffer[14] = 49;
 	ntpPacketBuffer[15] = 52;
 	// all NTP fields have been given values, now
-	// you can send a packet requesting a timestamp: 
+	// you can send a packet requesting a timestamp:
 	udp.beginPacket(address, 123); //NTP requests are to port 123
 	udp.write(ntpPacketBuffer, NTP_PACKET_SIZE);
 	udp.endPacket();
@@ -130,14 +130,14 @@ time_t getTime() {
 		setSyncInterval(NTP.getShortInterval()); // Retry connection more often
         if (onSyncEvent)
             onSyncEvent(noResponse);
-		return 0; // return 0 if unable to get the time 
+		return 0; // return 0 if unable to get the time
 	}
 	else {
 		DEBUGLOGCR(F("-- Invalid address :-(("));
         if (onSyncEvent)
             onSyncEvent(invalidAddress);
         udp.stop();
-		return 0; // return 0 if unable to get the time 
+		return 0; // return 0 if unable to get the time
 	}
 }
 #elif NETWORK_TYPE == NETWORK_WIFI101
@@ -159,7 +159,7 @@ boolean sendNTPpacket(const char* address, WiFiUDP udp) {
 	ntpPacketBuffer[14] = 49;
 	ntpPacketBuffer[15] = 52;
 	// all NTP fields have been given values, now
-	// you can send a packet requesting a timestamp: 
+	// you can send a packet requesting a timestamp:
 	udp.beginPacket(address, 123); //NTP requests are to port 123
 	udp.write(ntpPacketBuffer, NTP_PACKET_SIZE);
 	udp.endPacket();
@@ -210,7 +210,7 @@ time_t getTime() {
 			NTP.setLastNTPSync(timeValue);
 			DEBUGLOG(F("Succeccful NTP sync at "));
 			DEBUGLOGCR(NTP.getTimeDateString(NTP.getLastNTPSync()));
-            
+
             if (onSyncEvent)
                 onSyncEvent(timeSyncd);
 			return timeValue;
@@ -221,7 +221,7 @@ time_t getTime() {
 	setSyncInterval(NTP.getShortInterval()); // Retry connection more often
     if (onSyncEvent)
         onSyncEvent(noResponse);
-	return 0; // return 0 if unable to get the time 
+	return 0; // return 0 if unable to get the time
 }
 
 #endif //NETWORK_TYPE
@@ -304,7 +304,7 @@ String NTPClient::getTimeStr() {
 String NTPClient::getDateStr(time_t moment) {
 	if ((timeStatus() != timeNotSet) || (moment != 0)) {
 		String timeStr = "";
-		
+
 		timeStr += printDigits(day(moment));
 		timeStr += "/";
 		timeStr += printDigits(month(moment));
@@ -420,7 +420,7 @@ boolean NTPClient::setInterval(int shortInterval, int longInterval) {
 
 boolean NTPClient::setTimeZone(int timeZone)
 {
-	if (timeZone >= -11 || timeZone <= 13) {
+	if (timeZone >= -12 && timeZone <= 14) {
 		_timeZone = timeZone;
 		DEBUGLOGCR(F("Time zone set to "));
 		DEBUGLOGCR(_timeZone);
@@ -492,7 +492,7 @@ String NTPClient::getUptimeString() {
 
 	String uptimeStr = "";
 	char buffer[20];
-	sprintf(buffer, "%4d days %02d:%02d:%02d", days, hours, minutes, seconds);
+	sprintf(buffer, "%4u days %02d:%02d:%02d", days, hours, minutes, seconds);
 	uptimeStr += buffer;
 
 	return uptimeStr;
@@ -517,4 +517,4 @@ boolean NTPClient::isSummerTimePeriod(time_t moment) {
 	return summertime(year(), month(), day(), hour(), getTimeZone());
 }
 
-#endif // ARDUINO_ARCH_AVR
+#endif // ARDUINO_ARCH_AVR

src/ESPNTPClient.cpp

@@ -25,9 +25,9 @@ The views and conclusions contained in the software and documentation are those
 authors and should not be interpreted as representing official policies, either expressed
 or implied, of German Martin
 */
-// 
-// 
-// 
+//
+//
+//
 
 #ifdef ARDUINO_ARCH_ESP8266
 
@@ -51,12 +51,13 @@ NTPClient::NTPClient()
 
 bool NTPClient::setNtpServerName(String ntpServerName, int idx)
 {
-	char * buffer = (char *)malloc((ntpServerName.length()+1) * sizeof(char));
 	if ((idx >= 0) && (idx <= 2)) {
 		sntp_stop();
-		ntpServerName.toCharArray(buffer, ntpServerName.length()+1);
+		char* buffer = (char*)malloc((ntpServerName.length() + 1) * sizeof(char));
+		ntpServerName.toCharArray(buffer, ntpServerName.length() + 1);
 		sntp_setservername(idx, buffer);
 		DEBUGLOG("NTP server %d set to: %s \r\n", idx, buffer);
+		free(buffer);
 		sntp_init();
 		return true;
 	}
@@ -343,7 +344,7 @@ time_t NTPClient::getFirstSync()
 			_firstSync = now() - getUptime();
 		}
 	}
-	
+
 	return _firstSync;
 }
 
@@ -352,7 +353,7 @@ String NTPClient::getUptimeString() {
 	uint8 hours;
 	uint8 minutes;
 	uint8 seconds;
-	
+
 	long uptime = getUptime();
 
 	seconds = uptime % SECS_PER_MIN;
@@ -363,7 +364,7 @@ String NTPClient::getUptimeString() {
 	uptime -= hours * SECS_PER_HOUR;
 	days = uptime / SECS_PER_DAY;
 
-	String uptimeStr = ""; 
+	String uptimeStr = "";
 	char buffer[20];
 	sprintf(buffer, "%d days %02d:%02d:%02d", days, hours, minutes, seconds);
 	uptimeStr += buffer;
@@ -383,4 +384,4 @@ boolean NTPClient::isSummerTimePeriod(time_t moment) {
 	return summertime(year(), month(), day(), hour(), getTimeZone());
 }
 
-#endif // ARDUINO_ARCH_ESP8266
+#endif // ARDUINO_ARCH_ESP8266