Single linked list in C

list.c

typedef struct Node {
  struct Node *next;
  int val;
} Node;

typedef struct {
  int length;
  Node *next;
} List;

void list_append(List *l, int v) {
  Node *cn;

  l->length += 1;

  if (l->next == NULL) {
    l->next = calloc(1, sizeof(Node));
    l->next->val = v;
    return;
  }

  cn = l->next;

  while (true) {
    if (cn->next == NULL) {
      cn->next = calloc(1, sizeof(Node));
      cn->next->val = v;
      return;
    }
    cn = cn->next;
  }
}

void list_print(List l, const char *s) {
  Node *cn = l.next;

  while (cn != NULL) {
    printf("%d", cn->val);
    printf("%s", s);
    cn = cn->next;
  }
}