list.c

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#include <stdlib.h>
#include "list.h"

void list_int_create(list_int_node** list) {
    (*list) = (list_int_node*) malloc(sizeof(list_int_node));
    (*list)->data = 0;
    (*list)->next = NULL;
 
}

void list_int_free(list_int_node** list) {
    list_int_node* node = (*list);
    int n = list_int_size(*list);
    list_int_node* next_node = (*list)->next;
    int i;
    for(i = 0; i < n; i++) {
        free(node);
        node = next_node;
        next_node = next_node->next;
    }
    free(node);
    (*list) = NULL;
}

void list_int_add(list_int_node* list, int data) {
    list_int_node* node = list;
    while(node->next != NULL) {
        node = node->next;
    }
 
    list_int_node* new_node = (list_int_node*) malloc(sizeof(list_int_node));
    new_node->next = NULL;
 
    node->next = new_node;
    node->data = data;
}

int list_int_get(list_int_node* list, int index) {
    int i = 0;
    list_int_node* node = list;
    while(i < index) {
        node = node->next;
        i++;
    }
    return node->data;
}

int list_int_size(list_int_node* list) {
    int i = 0;
    list_int_node* node = list;
    while(node->next != NULL) {
        node = node->next;
        i++;
    }
    return i;
}