Function calloc

mm/umm_heap/umm_calloc.c:49–90

#undef calloc
FAR void *calloc(size_t n, size_t elem_size)
{
#if defined(CONFIG_ARCH_ADDRENV) && defined(CONFIG_BUILD_KERNEL)
  /* Use zalloc() because it implements the sbrk() logic */

  FAR void *mem = NULL;
  /* Verify input parameters
   *
   * elem_size or n is zero treats as valid input.
   *
   * Assure that the following multiplication cannot overflow the size_t
   * type, i.e., that:  SIZE_MAX >= n * elem_size
   *
   * Refer to SEI CERT C Coding Standard.
   */

  if (elem_size == 0 || n <= (SIZE_MAX / elem_size))
    {
      /* Use zalloc() because it implements the sbrk() logic */

      mem = zalloc(n * elem_size);
    }

  return mem;
#else
  /* Use mm_calloc() because it implements the clear */

  FAR void *mem = mm_calloc(USR_HEAP, n, elem_size);

  if (mem == NULL)
    {
      set_errno(ENOMEM);
    }
  else
    {
      mm_notify_pressure(mm_heapfree(USR_HEAP),
                         mm_heapfree_largest(USR_HEAP));
    }

  return mem;
#endif
}