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 "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     DWORD w;
  45
  46     TRACE( "abs diskwrite, drive %d, sector %d, "
  47            "count %d, buffer %p\n",
  48            drive, begin, nr_sect, dataptr );
  49
  50     root[4] += drive;
  51     h = CreateFileW(root, GENERIC_WRITE, FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
  52                     0, NULL);
  53     if (h != INVALID_HANDLE_VALUE)
  54     {
  55         SetFilePointer(h, begin * 512, NULL, SEEK_SET );
  56         /* FIXME: check errors */
  57         WriteFile( h, dataptr, nr_sect * 512, &w, NULL );
  58         CloseHandle( h );
  59     }
  60     else if (!fake_success)
  61         return FALSE;
  62
  63     return TRUE;
  64 }
  65
  66
  67 /**********************************************************************
  68  *          DOSVM_Int26Handler
  69  *
  70  * Handler for int 26h (absolute disk write).
  71  */
  72 void WINAPI DOSVM_Int26Handler( CONTEXT *context )
  73 {
  74     WCHAR drivespec[4] = {'A', ':', '\\', 0};
  75     BYTE *dataptr = CTX_SEG_OFF_TO_LIN( context, context->SegDs, context->Ebx );
  76     DWORD begin;
  77     DWORD length;
  78
  79     drivespec[0] += AL_reg( context );
  80
  81     if (GetDriveTypeW( drivespec ) == DRIVE_NO_ROOT_DIR ||
  82         GetDriveTypeW( drivespec ) == DRIVE_UNKNOWN)
  83     {
  84         SET_CFLAG( context );
  85         SET_AX( context, 0x0201 ); /* unknown unit */
  86         return;
  87     }
  88
  89     if (CX_reg( context ) == 0xffff)
  90     {
  91         begin   = *(DWORD *)dataptr;
  92         length  = *(WORD *)(dataptr + 4);
  93         dataptr = (BYTE *)CTX_SEG_OFF_TO_LIN( context,
  94                                               *(WORD *)(dataptr + 8),
  95                                               *(DWORD *)(dataptr + 6) );
  96     }
  97     else
  98     {
  99         begin  = DX_reg( context );
 100         length = CX_reg( context );
 101     }
 102
 103     DOSVM_RawWrite( AL_reg( context ), begin, length, dataptr, TRUE );
 104     RESET_CFLAG( context );
 105 }