dlls/krnl386.exe16/int26.c

   1 /*
   2  * DOS interrupt 26h handler
   3  *
   4  * Copyright 1997 Andreas Mohr
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include <stdlib.h>
  22 #include <stdio.h>
  23 #include <fcntl.h>
  24
  25 #include "dosexe.h"
  26 #include "wine/debug.h"
  27
  28 WINE_DEFAULT_DEBUG_CHANNEL(int);
  29
  30
  31 /***********************************************************************
  32  *           DOSVM_RawWrite
  33  *
  34  * Write raw sectors to a device.
  35  */
  36 BOOL DOSVM_RawWrite(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
  37 {
  38     WCHAR root[] = {'\\','\\','.','\\','A',':',0};
  39     HANDLE h;
  40     DWORD w;
  41
  42     TRACE( "abs diskwrite, drive %d, sector %d, "
  43            "count %d, buffer %p\n",
  44            drive, begin, nr_sect, dataptr );
  45
  46     root[4] += drive;
  47     h = CreateFileW(root, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
  48                     0, NULL);
  49     if (h != INVALID_HANDLE_VALUE)
  50     {
  51         SetFilePointer(h, begin * 512, NULL, SEEK_SET );
  52         /* FIXME: check errors */
  53         WriteFile( h, dataptr, nr_sect * 512, &w, NULL );
  54         CloseHandle( h );
  55     }
  56     else if (!fake_success)
  57         return FALSE;
  58
  59     return TRUE;
  60 }
  61
  62
  63 /**********************************************************************
  64  *          DOSVM_Int26Handler
  65  *
  66  * Handler for int 26h (absolute disk write).
  67  */
  68 void WINAPI DOSVM_Int26Handler( CONTEXT *context )
  69 {
  70     WCHAR drivespec[] = {'A', ':', '\\', 0};
  71     BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
  72     DWORD begin;
  73     DWORD length;
  74
  75     drivespec[0] += AL_reg( context );
  76
  77     if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
  78         GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
  79     {
  80         SET_CFLAG( context );
  81         SET_AX( context, 0x0201 ); /* unknown unit */
  82         return;
  83     }
  84
  85     if (CX_reg( context ) == 0xffff)
  86     {
  87         begin   = *(DWORD *)dataptr;
  88         length  = *(WORD *)(dataptr + 4);
  89         dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
  90                                               *(WORD *)(dataptr + 8),
  91                                               *(DWORD *)(dataptr + 6) );
  92     }
  93     else
  94     {
  95         begin  = DX_reg( context );
  96         length = CX_reg( context );
  97     }
  98
  99     DOSVM_RawWrite( AL_reg( context ), begin, length, dataptr, TRUE );
 100     RESET_CFLAG( context );
 101 }