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/**
* @file realloc.c
* @brief realloc implementation.
*/
#include "libft.h"
#include "malloc.h"
#include "malloc_internal.h"
static t_chunk *
_s_ptr_to_chunk (void *ptr)
{
return ((t_chunk *)((char *)ptr - ALIGN (sizeof (t_chunk))));
}
void *
realloc (void *ptr, size_t size)
{
t_chunk *chunk;
void *new_ptr;
size_t copy_size;
if (!ptr)
return (malloc (size));
if (size == 0)
{
free (ptr);
return (NULL);
}
chunk = _s_ptr_to_chunk (ptr);
if (chunk->size >= ALIGN (size))
return (ptr);
new_ptr = malloc (size);
if (!new_ptr)
return (NULL);
copy_size = chunk->size;
if (copy_size > size)
copy_size = size;
ft_memcpy (new_ptr, ptr, copy_size);
free (ptr);
return (new_ptr);
}
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