#include "header.h"


void node_print(Node* n) {    
    while (n != NULL) {
        printf("%s\n", n->name);
        n = n->next;
    }
}

Node* add_tail(Node* n, char s[]) {
    if (n == NULL) {
        if ((n = malloc(sizeof(Node))) == NULL) {
            printf("could not malloc\n");
            exit(1);
        }
        n->next = NULL;
        n->prev = NULL;
        memcpy(n->name, s, LEN);
        return n;
    }
    if (!strcmp(n->name, "\0")) {
        memcpy(n->name, s, LEN);
        n->next = NULL;
        n->prev = NULL;
        return n;
    }

    Node* res = n;
    while (n->next != NULL) n = n->next;

    Node* tmp = malloc(sizeof(Node));
    memcpy(tmp->name, s, LEN);
    tmp->prev = n;
    n->next = tmp;
    return res;
}

Node get(Node* node, int n) {
    int i;
    for (i = 0; i < n; i++) {
        node = node->next;
    }
    return *node;
}

int len(Node* n) {
    int res = 0;
    while (n != NULL) {
        res++;
        n = n->next;
    }
    return res;
}

Node* xor_find(Node* n1, Node* n2) {
    int i, j, f = 0;
    Node* res = NULL;
    if ((res = malloc(sizeof(Node))) == NULL) {
        printf("could not malloc\n");
        exit(3);
    }

    for (i = 0; i < len(n1); i++) {
        for (j = 0; j < len(n2); j++) {
            if (strcmp(get(n1, i).name, get(n2, j).name) == 0) {
                f = 1;
            }
        }
        if (f == 0)
            res = add_tail(res, get(n1, i).name);
        f = 0;
    }

    for (i = 0; i < len(n2); i++) {
        for (j = 0; j < len(n1); j++) {
            if (strcmp(get(n2, i).name, get(n1, j).name) == 0) {
                f = 1;
            }
        }
        if (f == 0)
            res = add_tail(res, get(n2, i).name);
        f = 0;
    }

    return res;
}