/**
 * @file
 * Replaceable memory allocator.
 */
#include "refcount/allocator.h"

#include <stdlib.h>

/**
 * Initial value of #refcount_global_allocator.
 */
static const RefcountAllocator DEFAULT_ALLOCATOR = {
    .malloc.no_data = malloc,
    .free.no_data = free,
    .pass_data = false,
    .user_data = NULL,
};

/**
 * The global #RefcountAllocator used by other parts of RefCount. The default
 * value just calls the C standard functions malloc and free.
 */
const RefcountAllocator *refcount_global_allocator = &DEFAULT_ALLOCATOR;

/**
 * HTAllocator malloc function that delegates to #refcount_malloc.
 * @param size The number of bytes to allocate
 * @param alloc The #RefcountAllocator to use
 * @return The result of #refcount_malloc
 */
static void *refcount_ht_malloc(size_t size, void *alloc) {
    return refcount_malloc(alloc, size);
}

/**
 * HTAllocator free function that delegates to #refcount_free.
 * @param ptr The pointer to free
 * @param alloc The #RefcountAllocator to use
 */
static void refcount_ht_free(void *ptr, void *alloc) {
    refcount_free(alloc, ptr);
}

/**
 * Create a new HTAllocator that delegates to src.
 * @param src The #RefcountAllocator to delegate to
 * @param dest A pointer to a HTAllocator to initialize
 */
void refcount_allocator_to_ht_allocator(const RefcountAllocator *src,
                                        HTAllocator *dest) {
    dest->malloc = refcount_ht_malloc;
    dest->free = refcount_ht_free;
    dest->user_data = (void *) src;
}