将.csv文件读入C LinkedList

Question

I have the following struct :

struct NODE {
    char username[50];
    char password[50];
    char usertype[50];
    struct NODE *next;
} *head=NULL;

I would like to read from a .csv file, say database.csv of the form username, password, usertype , tokenize each line into tokens using strtok and put each token inside the right field. For instance, my file looks like this:

johnnydepp, pirate123, user
tonystark, iron456, sysop

I keep reading on C LinkedList , but I cannot figure it out. Any help would be greatly appreciate, or any good references on how to implement a LinkedList in C.

My main problem is putting element in the each of the node. I know how to use strtok to tokenize a line in a file. This is what I have done so far:

void createList() {
    FILE *data;
    data = fileopen("password.csv", "r");
    char parsedLine[50];
    while (fgets(parsedLine, 50, data) != NULL) {
    char *ptr = strtok(parsedLine, ", ");
        node *temp;
        temp = (node*)malloc(sizeof(node));
    // I am stuck here //
} 

Thanks!

EDIT

Will this work?

extern void createList() {

FILE *data;
data = fileopen("password.csv", "r");
char parsedLine[50];
while (fgets(parsedLine, 50, data) != NULL) {
    struct NODE *node = malloc(sizeof(struct NODE));
    char *getUser = strtok(parsedLine, ", ");
    strcpy(node->username, getUser);
    char *getPass = strtok(NULL, ", "); 
    strcpy(node->password, getPass);
    char *getType = strtok(NULL, ", ");
    strcpy(node->usertype, getType);    
    node->next = head;
    head = node;
}
fclose(data);

}

Answer 1

It's actually very simple... You have a NODE structure, which contains a next pointer, and a variable head which points to the head (first node) of the list. The head pointer starts out as NULL meaning the list is empty.

To add a node you create a node, then set the newly created nodes next pointer to point to the current head of the list, and set the head to point to the new node:

/* Allocate new node */
struct NODE *node = malloc(sizeof(struct NODE));

/* Link to the current head */
node->next = head;

/* Make the new node the head of the list */
head = node;

After doing this once, you have a list containing one node. After doing it twice you have a two-node list. Etc.