reactos/subsys/win32k/eng/float.c

   1 /*
   2  *  ReactOS W32 Subsystem
   3  *  Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003 ReactOS Team
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /* $Id$
  20  *
  21  * COPYRIGHT:         See COPYING in the top level directory
  22  * PROJECT:           ReactOS kernel
  23  * PURPOSE:           Engine floating point functions
  24  * FILE:              subsys/win32k/eng/float.c
  25  * PROGRAMER:         Jason Filby
  26  * REVISION HISTORY:
  27  */
  28
  29 #include <w32k.h>
  30
  31 #define NDEBUG
  32 #include <debug.h>
  33
  34 BOOL
  35 STDCALL
  36 EngRestoreFloatingPointState ( IN VOID *Buffer )
  37 {
  38   NTSTATUS Status;
  39   Status = KeRestoreFloatingPointState((PKFLOATING_SAVE)Buffer);
  40   if (Status != STATUS_SUCCESS)
  41     {
  42       return FALSE;
  43     }
  44   return TRUE;
  45 }
  46
  47 ULONG
  48 STDCALL
  49 EngSaveFloatingPointState(OUT VOID  *Buffer,
  50                           IN ULONG  BufferSize)
  51 {
  52   KFLOATING_SAVE TempBuffer;
  53   NTSTATUS Status;
  54   if (Buffer == NULL || BufferSize == 0)
  55     {
  56       /* Check for floating point support. */
  57       Status = KeSaveFloatingPointState(&TempBuffer);
  58       if (Status != STATUS_SUCCESS)
  59         {
  60           return(0);
  61         }
  62       KeRestoreFloatingPointState(&TempBuffer);
  63       return(sizeof(KFLOATING_SAVE));
  64     }
  65   if (BufferSize < sizeof(KFLOATING_SAVE))
  66     {
  67       return(0);
  68     }
  69   Status = KeSaveFloatingPointState((PKFLOATING_SAVE)Buffer);
  70   if (!NT_SUCCESS(Status))
  71     {
  72       return FALSE;
  73     }
  74   return TRUE;
  75 }
  76
  77