TestAlignment.c

 
#include <stdio.h>
#include <winpr/crt.h>
#include <winpr/windows.h>
 
int TestAlignment(int argc, char* argv[])
{
  void* ptr = NULL;
  size_t alignment = 0;
  size_t offset = 0;
 
  WINPR_UNUSED(argc);
  WINPR_UNUSED(argv);
 
  /* Alignment should be 2^N where N is a positive integer */
 
  alignment = 16;
  offset = 8;
 
  /* _aligned_malloc */
 
  ptr = winpr_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 = winpr_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;
  }
 
  winpr_aligned_free(ptr);
 
  /* _aligned_offset_malloc */
 
  ptr = winpr_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 = winpr_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. */
  winpr_aligned_free(ptr);
 
  return 0;
}