FreeRDP/winpr/libwinpr/crt/test/TestAlignment.c

#include <stdio.h>
#include <winpr/crt.h>
#include <winpr/windows.h>

int TestAlignment(int argc, char* argv[])
{
	void* ptr;
	size_t alignment;
	size_t offset;

	/* Alignment should be 2^N where N is a positive integer */

	alignment = 16;
	offset = 5;

	/* _aligned_malloc */

	ptr = _aligned_malloc(100, alignment);

	if (ptr == NULL)
	{
		printf("Error allocating aligned memory.\n");
		return -1;
	}

	if (((size_t)ptr % alignment) != 0)
	{
		printf("This pointer, %p, is not aligned on %" PRIuz "\n", ptr, alignment);
		return -1;
	}

	/* _aligned_realloc */

	ptr = _aligned_realloc(ptr, 200, alignment);

	if (((size_t)ptr % alignment) != 0)
	{
		printf("This pointer, %p, is not aligned on %" PRIuz "\n", ptr, alignment);
		return -1;
	}

	_aligned_free(ptr);

	/* _aligned_offset_malloc */

	ptr = _aligned_offset_malloc(200, alignment, offset);

	if (ptr == NULL)
	{
		printf("Error reallocating aligned offset memory.");
		return -1;
	}

	if (((((size_t)ptr) + offset) % alignment) != 0)
	{
		printf("This pointer, %p, does not satisfy offset %" PRIuz " and alignment %" PRIuz "\n",
		       ptr, offset, alignment);
		return -1;
	}

	/* _aligned_offset_realloc */

	ptr = _aligned_offset_realloc(ptr, 200, alignment, offset);

	if (ptr == NULL)
	{
		printf("Error reallocating aligned offset memory.");
		return -1;
	}

	if (((((size_t)ptr) + offset) % alignment) != 0)
	{
		printf("This pointer, %p, does not satisfy offset %" PRIuz " and alignment %" PRIuz "\n",
		       ptr, offset, alignment);
		return -1;
	}

	/* _aligned_free works for both _aligned_malloc and _aligned_offset_malloc. free() should not be
	 * used. */
	_aligned_free(ptr);

	return 0;
}