Function alloc_dynamic

mysys/array.c:162–198

*/

void *alloc_dynamic(DYNAMIC_ARRAY *array)
{
  DBUG_ENTER("alloc_dynamic");

  DBUG_ASSERT(array->size_of_element);          /* Ensure init() is called */
  if (array->elements == array->max_element)
  {
    char *new_ptr;
    if (array->malloc_flags & MY_INIT_BUFFER_USED)
    {
      /*
        In this scenario, the buffer is statically preallocated,
        so we have to create an all-new malloc since we overflowed
      */
      if (!(new_ptr= (char *) my_malloc(array->m_psi_key,
                                        (array->max_element+
                                         array->alloc_increment) *
                                        array->size_of_element,
                                        MYF(array->malloc_flags | MY_WME))))
        DBUG_RETURN(0);
      if (array->elements)
        memcpy(new_ptr, array->buffer,
               array->elements * array->size_of_element);
      array->malloc_flags&= ~MY_INIT_BUFFER_USED;
    }
    else if (!(new_ptr=(char*)
               my_realloc(array->m_psi_key, array->buffer,
                          (array->max_element+ array->alloc_increment) *
                          array->size_of_element,
                          MYF(MY_WME | MY_ALLOW_ZERO_PTR |
                              array->malloc_flags))))
      DBUG_RETURN(0);
    array->buffer= (uchar*) new_ptr;
    array->max_element+=array->alloc_increment;
  }
  DBUG_RETURN(array->buffer+(array->elements++ * array->size_of_element));
}


/*