dlls/winedos/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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22
  23 #include <stdlib.h>
  24 #include <stdio.h>
  25 #include <fcntl.h>
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29 #include "dosexe.h"
  30 #include "wine/debug.h"
  31
  32 WINE_DEFAULT_DEBUG_CHANNEL(int);
  33
  34
  35 /***********************************************************************
  36  *           DOSVM_RawWrite
  37  *
  38  * Write raw sectors to a device.
  39  */
  40 BOOL DOSVM_RawWrite(BYTE drive, DWORD begin, DWORD nr_sect, BYTE *dataptr, BOOL fake_success)
  41 {
  42     WCHAR root[] = {'\\','\\','.','\\','A',':',0};
  43     HANDLE h;
  44
  45     root[4] += drive;
  46     h = CreateFileW(root, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
  47                     0, NULL);
  48     if (h != INVALID_HANDLE_VALUE)
  49     {
  50         SetFilePointer(h, begin * 512, NULL, SEEK_SET );
  51         /* FIXME: check errors */
  52         WriteFile( h, dataptr, nr_sect * 512, NULL, NULL );
  53         CloseHandle( h );
  54     }
  55     else if (!fake_success)
  56         return FALSE;
  57
  58     return TRUE;
  59 }
  60
  61
  62 /**********************************************************************
  63  *          DOSVM_Int26Handler (WINEDOS16.138)
  64  *
  65  * Handler for int 26h (absolute disk read).
  66  */
  67 void WINAPI DOSVM_Int26Handler( CONTEXT86 *context )
  68 {
  69     WCHAR drivespec[4] = {'A', ':', '\\', 0};
  70     BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
  71     DWORD begin;
  72     DWORD length;
  73
  74     drivespec[0] += AL_reg( context );
  75
  76     if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
  77         GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
  78     {
  79         SET_CFLAG( context );
  80         SET_AX( context, 0x0201 ); /* unknown unit */
  81         return;
  82     }
  83
  84     if (CX_reg( context ) == 0xffff)
  85     {
  86         begin   = *(DWORD *)dataptr;
  87         length  = *(WORD *)(dataptr + 4);
  88         dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
  89                                               *(WORD *)(dataptr + 8),
  90                                               *(DWORD *)(dataptr + 6) );
  91     }
  92     else
  93     {
  94         begin  = DX_reg( context );
  95         length = CX_reg( context );
  96     }
  97
  98     TRACE( "abs diskwrite, drive %d, sector %ld, "
  99            "count %ld, buffer %p\n",
 100            AL_reg( context ), begin, length, dataptr );
 101
 102     DOSVM_RawWrite( AL_reg( context ), begin, length, dataptr, TRUE );
 103     RESET_CFLAG( context );
 104 }