Fix MISRA 2012 violations (#1208)

* Fix coverity issues

* Fix formatting

Author: tony-josi-aws

source/FreeRTOS_IP_Utils.c

@@ -1717,11 +1717,11 @@ int32_t FreeRTOS_add_int32( int32_t a,
 {
     int32_t ret;
 
-    if( ( a > 0 ) && ( b > ipINT32_MAX_VALUE - a ) )
+    if( ( a > 0 ) && ( b > ( ipINT32_MAX_VALUE - a ) ) )
     {
         ret = ipINT32_MAX_VALUE; /* Positive overflow */
     }
-    else if( ( a < 0 ) && ( b < ipINT32_MIN_VALUE - a ) )
+    else if( ( a < 0 ) && ( b < ( ipINT32_MIN_VALUE - a ) ) )
     {
         ret = ipINT32_MIN_VALUE; /* Negative underflow */
     }
@@ -1748,11 +1748,11 @@ int32_t FreeRTOS_multiply_int32( int32_t a,
     /* Check for overflow/underflow */
     if( a > 0 )
     {
-        if( ( b > 0 ) && ( a > ipINT32_MAX_VALUE / b ) )
+        if( ( b > 0 ) && ( a > ( ipINT32_MAX_VALUE / b ) ) )
         {
             ret = ipINT32_MAX_VALUE; /* Positive overflow */
         }
-        else if( ( b < 0 ) && ( b < ipINT32_MIN_VALUE / a ) )
+        else if( ( b < 0 ) && ( b < ( ipINT32_MIN_VALUE / a ) ) )
         {
             ret = ipINT32_MIN_VALUE; /* Negative underflow */
         }
@@ -1763,11 +1763,11 @@ int32_t FreeRTOS_multiply_int32( int32_t a,
     }
     else
     {
-        if( ( b > 0 ) && ( a < ipINT32_MIN_VALUE / b ) )
+        if( ( b > 0 ) && ( a < ( ipINT32_MIN_VALUE / b ) ) )
         {
             ret = ipINT32_MIN_VALUE; /* Negative underflow */
         }
-        else if( ( b < 0 ) && ( a < ipINT32_MAX_VALUE / b ) )
+        else if( ( b < 0 ) && ( a < ( ipINT32_MAX_VALUE / b ) ) )
         {
             ret = ipINT32_MAX_VALUE; /* Positive overflow */
         }

source/FreeRTOS_ND.c

@@ -99,6 +99,9 @@
 
 /** @brief  The time at which the last unsolicited ND was sent. Unsolicited NDs are used
  * to ensure ND tables are up to date and to detect IP address conflicts. */
+/* MISRA Ref 8.9.1 [File scoped variables] */
+/* More details at: https://github.com/FreeRTOS/FreeRTOS-Plus-TCP/blob/main/MISRA.md#rule-89 */
+/* coverity[misra_c_2012_rule_8_9_violation] */
     static TickType_t xLastUnsolicitedNDTime = 0U;
 
 /*-----------------------------------------------------------*/

source/FreeRTOS_TCP_WIN.c

@@ -1905,7 +1905,7 @@
             int32_t lWeight = 0;
             int32_t lDivisor = 0;
 
-            mS = mS < 0 ? ipINT32_MAX_VALUE : mS;
+            mS = ( mS < 0 ) ? ipINT32_MAX_VALUE : mS;
 
             if( pxWindow->lSRTT >= mS )
             {

source/include/FreeRTOS_IP.h

@@ -61,10 +61,10 @@
 #define ipSIZE_OF_TCP_HEADER     20U
 
 /* The maximum of int32 value. */
-#define ipINT32_MAX_VALUE        ( ( int32_t ) 0x7FFFFFFF )
+#define ipINT32_MAX_VALUE        ( ( int32_t ) 0x7FFFFFFFU )
 
 /* The minimum of int32 value. */
-#define ipINT32_MIN_VALUE        ( ( int32_t ) 0x80000000 )
+#define ipINT32_MIN_VALUE        ( ( int32_t ) 0x80000000U )
 
 /*
  * Generate a randomized TCP Initial Sequence Number per RFC.