llist.h

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#pragma once
#ifdef __cplusplus
extern "C" {
#endif

#include <stdlib.h>

typedef struct node_t node_t;
typedef void (*free_list_item_f)(void *);

struct node_t {
    void *val;
    node_t *next;
};

node_t *new_node(void *val, node_t *next);
size_t list_length(node_t *lst);
node_t *list_reverse(node_t *lst);
node_t *list_sort(node_t *lst, int (*compare)(const void *a, const void *b));
void free_list(node_t *n, free_list_item_f free_fn);

#ifdef __cplusplus
}
#endif