reactos/subsystems/win32/win32k/eng/float.c

   1 /*
   2  * COPYRIGHT:         See COPYING in the top level directory
   3  * PROJECT:           ReactOS kernel
   4  * PURPOSE:           Engine floating point functions
   5  * FILE:              subsys/win32k/eng/float.c
   6  * PROGRAMER:         Jason Filby
   7  */
   8
   9 /* INCLUDES *****************************************************************/
  10
  11 #include <win32k.h>
  12
  13 #define NDEBUG
  14 #include <debug.h>
  15
  16 /* FUNCTIONS *****************************************************************/
  17
  18 BOOL
  19 APIENTRY
  20 EngRestoreFloatingPointState ( IN VOID *Buffer )
  21 {
  22   NTSTATUS Status;
  23   Status = KeRestoreFloatingPointState((PKFLOATING_SAVE)Buffer);
  24   if (!NT_SUCCESS(Status))
  25     {
  26       return FALSE;
  27     }
  28   return TRUE;
  29 }
  30
  31 ULONG
  32 APIENTRY
  33 EngSaveFloatingPointState(OUT VOID  *Buffer,
  34      IN ULONG  BufferSize)
  35 {
  36   KFLOATING_SAVE TempBuffer;
  37   NTSTATUS Status;
  38   if (Buffer == NULL || BufferSize == 0)
  39     {
  40       /* Check for floating point support. */
  41       Status = KeSaveFloatingPointState(&TempBuffer);
  42       if (Status != STATUS_SUCCESS)
  43  {
  44    return(0);
  45  }
  46       KeRestoreFloatingPointState(&TempBuffer);
  47       return(sizeof(KFLOATING_SAVE));
  48     }
  49   if (BufferSize < sizeof(KFLOATING_SAVE))
  50     {
  51       return(0);
  52     }
  53   Status = KeSaveFloatingPointState((PKFLOATING_SAVE)Buffer);
  54   if (!NT_SUCCESS(Status))
  55     {
  56       return FALSE;
  57     }
  58   return TRUE;
  59 }