mojMinA (sa mainom)

#include <stdio.h>
#include <stdlib.h>

typedef struct Element_s
{
    char name[256];
    //long duration; //Sekunden;
    char interpreteur[256];
    struct Element_s *next;
    struct Element_s *prev;
} Element_t;

void read_in(Element_t *item);
Element_t *allocate();
Element_t *push_back(Element_t *list);
Element_t *find_end(Element_t *list);
void cleanup_list(Element_t **list);
void print_element(Element_t *element);
void print_list(Element_t *list);
void print_list_reverse(Element_t *list);

int main()
{
    //long i ;
    Element_t *liste = 0;

    liste = push_back(liste);

    printf("\nListing: ");
    print_list(liste);

    printf("\n\nUmgekehrte Reihenfolge: \n");
    print_list_reverse(liste);

    return 0;
}


void read_in(Element_t *item)
{
    printf("Name: ");
    fgets(item->name, 256, stdin);

    printf("Interpreteur: ");
    fgets(item->interpreteur, 256, stdin);
    //while(getchar() != '\n');

}

Element_t *allocate()
{
    Element_t *element = malloc(sizeof(Element_t));

    if(element == 0)
    {
        fprintf(stderr, "Error! No memory available!");
        //return 0;
    }
    else
    {
        read_in(element);
        element->prev = 0;
        element->next = 0;
    }
    return element;
}

Element_t *find_end(Element_t *list)
{
        while(list->next != 0)
            list = list->next;
        return list;
}

Element_t *push_back(Element_t *list)
{
    Element_t *element = allocate();

    if (element == 0)
    {
        fprintf(stderr, "Error: No memory allocated for push_back!\n");
        return list;
    }

    if(list != 0)
    {
        Element_t *end = find_end(list);
        element->prev = end;
        end->next = element;
    }
    else
    {
        list = element;
    }
    return list;
}

void cleanup_list(Element_t **list)
{
    Element_t *s = *list;
    Element_t *t = s;

    while(t != 0)
    {
        t = t->next;
        free(s);
        s = t;
    }
    printf("\nMemory freed.\n");
}

void print_element(Element_t *element)
{
    if(element != 0)
    {
    printf("\nName: %s", element->name);
    printf("Interpreteur: %s", element->interpreteur);
    }
    else
    printf("\nDie Stelle ist leer!");
}

void print_list(Element_t *list)
{
    long i=0;
    while(list != 0)
    {
        i++;
        printf("\nSong %ld .", i);
        print_element(list);
        list = list->next;
    }

}

void print_list_reverse(Element_t *list)
{
    if(list != 0)
    {
        print_list_reverse(list->next);
        print_element(list);
    }
}