Address various MISRA warnings v3 (#240)

* Add a branch and make MISRA changes

* initialize the value

* Update after Gary's comments

FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_Sockets.c

@@ -301,7 +301,7 @@ FreeRTOS_Socket_t const *pxSocket = NULL;
 Socket_t FreeRTOS_socket( BaseType_t xDomain, BaseType_t xType, BaseType_t xProtocol )
 {
 FreeRTOS_Socket_t *pxSocket;
-size_t uxSocketSize;
+size_t uxSocketSize = 0;
 EventGroupHandle_t xEventGroup;
 Socket_t xReturn;
 
@@ -311,8 +311,8 @@ Socket_t xReturn;
 	}
 	else
 	{
-		/* Allocate the structure that will hold the socket information.  The
-		size depends on the type of socket: UDP sockets need less space.  A
+		/* Allocate the structure that will hold the socket information. The
+		size depends on the type of socket: UDP sockets need less space. A
 		define 'pvPortMallocSocket' will used to allocate the necessary space.
 		By default it points to the FreeRTOS function 'pvPortMalloc()'. */
 		pxSocket = ipCAST_PTR_TO_TYPE_PTR( FreeRTOS_Socket_t, pvPortMallocSocket( uxSocketSize ) );
@@ -667,6 +667,7 @@ BaseType_t xTimed = pdFALSE;
 TimeOut_t xTimeOut;
 int32_t lReturn;
 EventBits_t xEventBits = ( EventBits_t ) 0;
+size_t uxPayloadLength;
 
 	if( prvValidSocket( pxSocket, FREERTOS_IPPROTO_UDP, pdTRUE ) == pdFALSE )
 	{
@@ -770,7 +771,8 @@ EventBits_t xEventBits = ( EventBits_t ) 0;
 			calculated at the total packet size minus the headers.
 			The validity of `xDataLength` prvProcessIPPacket has been confirmed
 			in 'prvProcessIPPacket()'. */
-			lReturn = ( int32_t ) ( pxNetworkBuffer->xDataLength - sizeof( UDPPacket_t ) );
+			uxPayloadLength = pxNetworkBuffer->xDataLength - sizeof( UDPPacket_t );
+			lReturn = ( int32_t ) uxPayloadLength;
 
 			if( pxSourceAddress != NULL )
 			{

FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_IP.c

@@ -2678,6 +2678,8 @@ const TCPWindow_t *pxTCPWindow = &pxSocket->u.xTCP.xTCPWindow;
 /* Find out what window size we may advertised. */
 int32_t lRxSpace;
 BaseType_t xSendLength = xByteCount;
+uint32_t ulRxBufferSpace;
+
 #if( ipconfigUSE_TCP_WIN == 1 )
 	#if( ipconfigTCP_ACK_EARLIER_PACKET == 0 )
 		const int32_t lMinLength = 0;
@@ -2688,7 +2690,9 @@ BaseType_t xSendLength = xByteCount;
 
 	/* Set the time-out field, so that we'll be called by the IP-task in case no
 	next message will be received. */
-	lRxSpace = ipNUMERIC_CAST( int32_t, pxSocket->u.xTCP.ulHighestRxAllowed - pxTCPWindow->rx.ulCurrentSequenceNumber );
+	ulRxBufferSpace = pxSocket->u.xTCP.ulHighestRxAllowed - pxTCPWindow->rx.ulCurrentSequenceNumber;
+	lRxSpace = ( int32_t ) ulRxBufferSpace;
+
 	#if ipconfigUSE_TCP_WIN == 1
 	{
 

FreeRTOS-Plus/Source/FreeRTOS-Plus-TCP/FreeRTOS_TCP_WIN.c

@@ -801,7 +801,7 @@ const int32_t l500ms = 500;
 
 	int32_t lTCPWindowRxCheck( TCPWindow_t *pxWindow, uint32_t ulSequenceNumber, uint32_t ulLength, uint32_t ulSpace )
 	{
-	uint32_t ulCurrentSequenceNumber, ulLast, ulSavedSequenceNumber;
+	uint32_t ulCurrentSequenceNumber, ulLast, ulSavedSequenceNumber, ulSequenceNumberDiff;
 	int32_t lReturn, lDistance;
 	TCPSegment_t *pxFound;
 
@@ -909,9 +909,10 @@ const int32_t l500ms = 500;
 			/*  An "out-of-sequence" segment was received, must have missed one.
 			Prepare a SACK (Selective ACK). */
 			ulLast = ulSequenceNumber + ulLength;
-			/* The cast from unsigned long to signed long is on purpose.
-			The macro 'ipNUMERIC_CAST' will prevent PC-lint from complaining. */
-			lDistance = ipNUMERIC_CAST( int32_t, ulLast - ulCurrentSequenceNumber );
+
+			ulSequenceNumberDiff = ulLast - ulCurrentSequenceNumber;
+			/* The cast from unsigned long to signed long is on purpose. */
+			lDistance = ( int32_t ) ulSequenceNumberDiff;
 
 			if( lDistance <= 0 )
 			{