#ifndef FREELIST_H
#define FREELIST_H

#include <stddef.h>
#include <stdint.h>
#include <stdlib.h>

#define FL_FREE ((uint8_t)0x00)
#define FL_USED ((uint8_t)0x01)

typedef struct FreeListBlock {
    struct FreeListBlock *next;
    uint8_t               block_state;
} FreeListBlock;

typedef struct {
    uintptr_t      start;
    uintptr_t      end;
    FreeListBlock *free;
    size_t         size;
    size_t         allocated;
} FreeList;

int    fl_init(FreeList *fl, uintptr_t start, uintptr_t end, size_t itemsize);
int    fl_free(FreeList *fl, void *ptr);
int    fl_is_managed(FreeList *fl, void *ptr);
void  *fl_alloc(FreeList *fl);
size_t fl_check(FreeList *fl);
size_t fl_allocated(FreeList *fl);
size_t fl_available(FreeList *fl);
size_t fl_capacity(FreeList *fl);
float  fl_utilization(FreeList *fl, size_t itemsize);

#endif // FREELIST_H