How come this works?

[caduardo21]

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

struct node {
    void *data;
    struct node *next;
};

struct node *rootp = NULL;

void append(char *str)
{
    struct node *newnode = malloc(sizeof(struct node));

    newnode->data = str;
    newnode->next = NULL;

    if (rootp == NULL)
        rootp = newnode;

    else {
        struct node *walker = rootp;

        while (walker->next != NULL)
            walker = walker->next;

        walker->next= newnode;
    }
}

void mostrar_lista(void)
{
    struct node *walker = rootp;

    while (walker != NULL) {
        printf("%s\n", walker->data);
        walker = walker->next;
    }
}

int main(void)
{
    append("foo");
    append("bar");
    append("C!");

    mostrar_lista();

    return 0;
}

foo, bar, and C! are not copied to anywhere so how can I point to something that "doesn't exist"?

[Dave_Sinkula]

String literals do exist.