reactos/lib/rosrtl/thread/linearstack.c

   1 /* $Id$
   2 */
   3 /*
   4 */
   5
   6 #define NTOS_MODE_USER
   7 #include <ntos.h>
   8
   9 #include <rosrtl/thread.h>
  10
  11 NTSTATUS NTAPI RtlpRosValidateLinearUserStack
  12 (
  13  IN PVOID StackBase,
  14  IN PVOID StackLimit,
  15  IN BOOLEAN Direction
  16 )
  17 {
  18  /* the stack has a null or negative (relatively to its direction) length */
  19  /*
  20   Direction: TRUE for down-top, FALSE for top-down
  21
  22   Direction == TRUE and positive stack size: OK
  23   Direction == TRUE and negative stack size: error
  24   Direction == FALSE and positive stack size: error
  25   Direction == FALSE and negative stack size: OK
  26  */
  27  if
  28  (
  29   StackBase == StackLimit ||
  30   (Direction ^ ((PCHAR)StackBase < (PCHAR)StackLimit))
  31  )
  32   return STATUS_BAD_INITIAL_STACK;
  33
  34  /* valid stack */
  35  return STATUS_SUCCESS;
  36 }
  37
  38 /* EOF */