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#ifndef NEOAS_ALLOCATOR_H_INCLUDED
# define NEOAS_ALLOCATOR_H_INCLUDED
struct memory_allocator
{
void *(*allocate) (void *, size_t, size_t);
void *(*reallocate) (void *, void *, size_t, size_t);
void (*deallocate) (void *, void *);
void *context;
};
static inline const struct memory_allocator *default_memory_allocator (void);
static inline int safe_allocate (const struct memory_allocator *allocator,
size_t n, size_t size, void **allocated);
static inline int safe_reallocate (const struct memory_allocator *allocator,
void **memory, size_t n, size_t size);
static inline void safe_deallocate (const struct memory_allocator *allocator,
void **allocated);
static inline void copy_allocator (struct memory_allocator *dest,
const struct memory_allocator *src);
# include <stdlib.h>
# define ALLOCATE(ptr, n) \
(safe_allocate (allocator, n, sizeof (*ptr), (void **) (&ptr)))
# define REALLOCATE(ptr, n) \
(safe_reallocate (allocator, (void **) (&ptr), n, sizeof (*ptr)))
# define DEALLOCATE(ptr) \
(safe_deallocate (allocator, (void **) (&ptr)))
static void *
default_allocate (void *unused, size_t n, size_t type)
{
(void) unused;
return calloc (n, type);
}
static void *
default_reallocate (void *unused, void *mem, size_t n, size_t type)
{
(void) unused;
return realloc (mem, n * type);
}
static void
default_deallocate (void *unused, void *mem)
{
(void) unused;
free (mem);
}
static inline const struct memory_allocator *
default_memory_allocator (void)
{
static const struct memory_allocator alloc = {
.allocate = default_allocate,
.reallocate = default_reallocate,
.deallocate = default_deallocate,
.context = NULL
};
return &alloc;
}
static inline int
safe_allocate (const struct memory_allocator *allocator,
size_t n, size_t size, void **allocated)
{
if (allocator == NULL)
{
allocator = default_memory_allocator ();
}
*allocated = allocator->allocate ((void *) allocator->context, n, size);
if (*allocated == NULL)
{
return -1;
}
return 0;
}
static inline int
safe_reallocate (const struct memory_allocator *allocator,
void **memory, size_t n, size_t size)
{
if (allocator == NULL)
{
allocator = default_memory_allocator ();
}
if (n == 0)
{
n = 1;
}
if (size == 0)
{
size = 1;
}
void *reallocated =
allocator->reallocate (allocator->context, *memory, n, size);
if (reallocated == NULL)
{
return -1;
}
*memory = reallocated;
return 0;
}
static inline void
safe_deallocate (const struct memory_allocator *allocator, void **allocated)
{
if (allocator == NULL)
{
allocator = default_memory_allocator ();
}
void *ptr = *allocated;
if (ptr)
{
allocator->deallocate (allocator->context, ptr);
}
*allocated = NULL;
}
static inline void
copy_allocator (struct memory_allocator *dest,
const struct memory_allocator *src)
{
if (src == NULL)
{
src = default_memory_allocator ();
}
dest->allocate = src->allocate;
dest->reallocate = src->reallocate;
dest->deallocate = src->deallocate;
dest->context = src->context;
}
#endif /* not NEOAS_ALLOCATOR_H_INCLUDED */
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