Question on passing a pointer to a structure in C to a function?
- by worlds-apart89
Below, I wrote a primitive singly linked list in C. Function "addEditNode" MUST receive a pointer by value, which, I am guessing, means we can edit the data of the pointer but can not point it to something else. If I allocate memory using malloc in "addEditNode", when the function returns, can I see the contents of first-next ? Second question is do I have to free first-next or is it only first that I should free? I am running into segmentation faults on Linux.
#include <stdio.h>
#include <stdlib.h>
typedef struct list_node list_node_t;
struct list_node
{
int value;
list_node_t *next;
};
void addEditNode(list_node_t *node)
{
node->value = 10;
node->next = (list_node_t*) malloc(sizeof(list_node_t));
node->next->value = 1;
node->next->next = NULL;
}
int main()
{
list_node_t *first = (list_node_t*) malloc(sizeof(list_node_t));
first->value = 1;
first->next = NULL;
addEditNode(first);
free(first);
return 0;
}
