Function PREFIX(realloc)

Kernel/src/liballoc/liballoc.c:672–755

}

void*   PREFIX(realloc)(void *p, size_t size)
{
	void *ptr;
	struct liballoc_minor *min;
	unsigned int real_size;

	// Honour the case of size == 0 => free old and return NULL
	if (size == 0)
	{
		PREFIX(free)(p);
		return NULL;
	}

	// In the case of a NULL pointer, return a simple malloc.
	if (p == NULL) return PREFIX(malloc)(size);

	// Unalign the pointer if required.
	ptr = p;
	UNALIGN(ptr);

	liballoc_lock();		// lockit

	min = (struct liballoc_minor*)((uintptr_t)ptr - sizeof(struct liballoc_minor));

	// Ensure it is a valid structure.
	if (min->magic != LIBALLOC_MAGIC)
	{
		l_errorCount += 1;

		// Check for overrun errors. For all bytes of LIBALLOC_MAGIC 
		if (
			((min->magic & 0xFFFFFF) == (LIBALLOC_MAGIC & 0xFFFFFF)) ||
			((min->magic & 0xFFFF) == (LIBALLOC_MAGIC & 0xFFFF)) ||
			((min->magic & 0xFF) == (LIBALLOC_MAGIC & 0xFF))
			)
		{
			l_possibleOverruns += 1;
#if defined DEBUG || defined INFO
			kprintf("liballoc: ERROR: Possible 1-3 byte overrun for magic %x != %x\n",
				min->magic,
				LIBALLOC_MAGIC);
			FLUSH();
#endif
		}


		if (min->magic == LIBALLOC_DEAD)
		{
#if defined DEBUG || defined INFO
			kprintf("liballoc: ERROR: multiple PREFIX(free)() attempt on %x from %x.\n",
				ptr,
				__builtin_return_address(0));
			FLUSH();
#endif
		}
		else
		{
		}