crappy_linked_list.c

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

struct Link_t {
  int value;
  struct Link_t* next;
};

typedef struct Link_t Link;

Link*
ll_new(int value) {
  Link* l = (Link*)malloc(sizeof(Link));
  if (l == NULL) {
    return NULL;
  }
  l->value = value;
  l->next = NULL;
  return l;
}

void
ll_append(Link* l, int value) {
  while (l->next != NULL) { l = l->next; }
  Link* new = (Link*)malloc(sizeof(Link));
  new->next  = NULL;
  new->value = value;
  l->next = new;
}

void
ll_each(Link* l, void(*fn)(int)) {
  while (l != NULL) {
    fn(l->value);
    l = l->next;
  } 
}

void
print_int(int x) {
  printf("%d\n", x);
}

int main(void) {

  Link* l = ll_new(0);

  for (int i = 0; i < 10; i++) {
    ll_append(l, i+10);
  }

  ll_each(l, &print_int);

  return 0;
}