CS3413/Assignment1/node.c

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "node.h"

//Assume that the string passed in is null terminated
Node *createNode(char *data) {
    // Allocate memory for the node, and check if it was successful
    Node *node = calloc(1, sizeof(Node));
    if (node == NULL) {
        printf("Error allocating memory for node\n");
        exit(EXIT_FAILURE);
    }
    // Allocate memory for the data, and check if it was successful
    node->data = calloc(strlen(data) + 1, sizeof(char));
    if (node->data == NULL) {
        printf("Error allocating memory for node data\n");
        exit(EXIT_FAILURE);
    }
    // Copy data from the string passed in to the node's data
    // Makes sure if the string passed in is changed, the node's data is not changed
    // Also makes sure that if the data is on the stack, it is not freed at some other point
    strcpy(node->data, data);
    node->next_elem = NULL;
    return node;
}

void destroyNode(Node *node) {
    // Free the data first, then free the node
    free(node->data);
    free(node);
}

void replaceData(Node *node, char *data) {
    // Free the data first, then allocate memory for the new data
    free(node->data);
    node->data = calloc(strlen(data) + 1, sizeof(char));
    if (node->data == NULL) {
        printf("Error allocating memory for replacing data\n");
        exit(EXIT_FAILURE);
    }
    // Same rational as for createNode
    strcpy(node->data, data);
}