diff --git a/src/libsys/console.c b/src/libsys/console.c
index 8209bd6..db70fc9 100644
--- a/src/libsys/console.c
+++ b/src/libsys/console.c
@@ -14,8 +14,7 @@ extern const con_if_t con_if;
 con_if_entry_t const* con_getInterface(int file)
 {
 	con_if_entry_t const *result = NULL;
-	int i;
-	for (i=0; i < con_if.length; i++)
+	for (int i=0; i < con_if.length; i++)
 	{
 		if (file == con_if.con_if_entry[i].fd)
 		{
@@ -29,8 +28,7 @@ con_if_entry_t const* con_getInterface(int file)
 con_if_entry_t const* con_getInterfaceByName(char const *pName)
 {
 	void const *result = NULL;
-	int i;
-	for (i=0; i < con_if.length; i++)
+	for (int i=0; i < con_if.length; i++)
 	{
 		if (!strcmp(pName, con_if.con_if_entry[i].pName))
 		{
@@ -44,8 +42,7 @@ con_if_entry_t const* con_getInterfaceByName(char const *pName)
 void const* con_getInstanceByName(char const *pName)
 {
 	void const *result = NULL;
-	int i;
-	for (i=0; i < con_if.length; i++)
+	for (int i=0; i < con_if.length; i++)
 	{
 		if (!strcmp(pName, con_if.con_if_entry[i].pName))
 		{
@@ -58,17 +55,17 @@ void const* con_getInstanceByName(char const *pName)
 
 int con_open(char const *pName)
 {
-	int i;
-	assert(pName);
-	
-	for (i=0; i < con_if.length; i++)
+	if(pName)
 	{
-		if (!strcmp(pName, con_if.con_if_entry->pName))
+		for (int i=0; i < con_if.length; i++)
 		{
-			if (con_if.con_if_entry->openFunc)
+			if (!strcmp(pName, con_if.con_if_entry->pName))
 			{
-				con_if.con_if_entry->openFunc(&con_if.con_if_entry[i].pInst);
-				return i;
+				if (con_if.con_if_entry->openFunc)
+				{
+					con_if.con_if_entry->openFunc(&con_if.con_if_entry[i].pInst);
+					return i;
+				}
 			}
 		}
 	}
@@ -85,17 +82,20 @@ void con_flush(int fd)
 	int c;
 	con_if_entry_t const *pIF = con_getInterface(fd);
 
-	do
+	if (pIF && pIF->readchar)
 	{
-		c = pIF->readchar(pIF->pInst);
-		
-	} while(c > 0);
+		do
+		{
+			c = pIF->readchar(pIF->pInst);
+
+		} while(c > 0);
+	}
 }
 
 int con_readchar(con_if_entry_t const *pIF)
 {
 	int c = -1;
-	if (pIF)
+	if (pIF && pIF->readchar)
 	{
 		// busy read
 		do
@@ -109,7 +109,7 @@ int con_readchar(con_if_entry_t const *pIF)
 
 void con_writechar(con_if_entry_t const *pIF, char c)
 {
-	if (pIF)
+	if (pIF && pIF->writechar)
 	{
 		pIF->writechar(pIF->pInst, c);
 	}
@@ -133,7 +133,6 @@ void _putchar(int fd, char c)
 		writechar(fd, 0x0D);
 	}
 	writechar(fd, c);
-
 }
 
 char _getchar()