RIOT/core/lifo.c

#include <lifo.h>

int lifo_empty(int *array) {
    return array[0] == -1;
}

void lifo_init(int *array, int n) {
    for (int i = 0; i <= n; i++) {
        array[i] = -1;
    }
}

void lifo_insert(int *array, int i) {
    int index = i+1;
    array[index] = array[0];
    array[0] = i;
}

int lifo_get(int *array) {
    int head = array[0];
    if (head != -1) {
        array[0] = array[head+1];
    }
    return head;
}


#ifdef WITH_MAIN
#include <stdio.h>
int main() {
    int array[5];
    
    lifo_init(array, 4);

    lifo_insert(array, 0);
    lifo_insert(array, 1);
    lifo_insert(array, 2);
    lifo_insert(array, 3);
    printf("get: %i\n", lifo_get(array));


    return 0;
}
#endif