How and where would I put a free() function in this piece of code in order to prevent memory leaks when I valgrind. (This is just a piece of a larger code)
pizzaNode * AddTopping1 (char *s, pizzaNode * head) {
pizzaNode * newPtr = (pizzaNode *)(malloc(sizeof(pizzaNode)));
// set values of the new node
strcpy(newPtr->topping, s);
newPtr->next = NULL;
// Add the topping to the beginning of the list:
if (head == NULL)
{
head = newPtr;
}
else
{
newPtr->next = head;
//head = newPtr;
}
return newPtr; // newPtr is the new head now
}
Or at least what is the syntax to write a free() function for this malloc?
It seems this function adds a new node to a list.
The dynamically allocated memory for the list should be freed when the list is not needed any more as for example
void clear( pizzaNode **head )
{
while ( *head != NULL )
{
pizzaNode *current = *head;
*head = ( *head )->next;
free( current );
}
}
If in the caller you declared a pointer to the head node like for example
pizzaNode *head = NULL;
then the function is called like
clear( &head );
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