dlls/winedos/int21.c

   1 /*
   2  * DOS interrupt 21h handler
   3  *
   4  * Copyright 1993, 1994 Erik Bos
   5  * Copyright 1996 Alexandre Julliard
   6  * Copyright 1997 Andreas Mohr
   7  * Copyright 1998 Uwe Bonnes
   8  * Copyright 1998, 1999 Ove Kaaven
   9  *
  10  * This library is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU Lesser General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2.1 of the License, or (at your option) any later version.
  14  *
  15  * This library is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public
  21  * License along with this library; if not, write to the Free Software
  22  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "config.h"
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winternl.h"
  30 #include "wine/winbase16.h"
  31 #include "dosexe.h"
  32 #include "miscemu.h"
  33 #include "msdos.h"
  34 #include "file.h"
  35 #include "wine/unicode.h"
  36 #include "wine/debug.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(int21);
  39
  40 void WINAPI DOSVM_Int21Handler_Ioctl( CONTEXT86 *context )
  41 {
  42   static const WCHAR emmxxxx0W[] = {'E','M','M','X','X','X','X','0',0};
  43   const DOS_DEVICE *dev = DOSFS_GetDeviceByHandle(
  44       DosFileHandleToWin32Handle(BX_reg(context)) );
  45
  46   if (dev && !strcmpiW( dev->name, emmxxxx0W )) {
  47     EMS_Ioctl_Handler(context);
  48     return;
  49   }
  50
  51   switch (AL_reg(context))
  52   {
  53   case 0x0b: /* SET SHARING RETRY COUNT */
  54       TRACE("IOCTL - SET SHARING RETRY COUNT pause %d retries %d\n",
  55            CX_reg(context), DX_reg(context));
  56       if (!CX_reg(context))
  57       {
  58          SET_AX( context, 1 );
  59          SET_CFLAG(context);
  60          break;
  61       }
  62       DOSMEM_LOL()->sharing_retry_delay = CX_reg(context);
  63       if (!DX_reg(context))
  64          DOSMEM_LOL()->sharing_retry_count = DX_reg(context);
  65       RESET_CFLAG(context);
  66       break;
  67   default:
  68       DOS3Call( context );
  69   }
  70 }
  71
  72 /***********************************************************************
  73  *           DOSVM_Int21Handler
  74  *
  75  * int 21h real-mode handler. Most calls are passed directly to DOS3Call.
  76  */
  77 void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
  78 {
  79     BYTE ascii;
  80     RESET_CFLAG(context);  /* Not sure if this is a good idea */
  81
  82     if(AH_reg(context) == 0x0c) /* FLUSH BUFFER AND READ STANDARD INPUT */
  83     {
  84         BYTE al = AL_reg(context); /* Input function to execute after flush. */
  85
  86         /* FIXME: buffers are not flushed */
  87
  88         /*
  89          * If AL is not one of 0x01, 0x06, 0x07, 0x08, or 0x0a,
  90          * the buffer is flushed but no input is attempted.
  91          */
  92         if(al != 0x01 && al != 0x06 && al != 0x07 && al != 0x08 && al != 0x0a)
  93             return;
  94
  95         SET_AH( context, al );
  96     }
  97
  98     switch(AH_reg(context))
  99     {
 100     case 0x00: /* TERMINATE PROGRAM */
 101         TRACE("TERMINATE PROGRAM\n");
 102         MZ_Exit( context, FALSE, 0 );
 103         break;
 104
 105     case 0x01: /* READ CHARACTER FROM STANDARD INPUT, WITH ECHO */
 106         TRACE("DIRECT CHARACTER INPUT WITH ECHO\n");
 107         DOSVM_Int16ReadChar(&ascii, NULL, FALSE);
 108         SET_AL( context, ascii );
 109         DOSVM_PutChar(AL_reg(context));
 110         break;
 111
 112     case 0x02: /* WRITE CHARACTER TO STANDARD OUTPUT */
 113         TRACE("Write Character to Standard Output\n");
 114         DOSVM_PutChar(DL_reg(context));
 115         break;
 116
 117     case 0x06: /* DIRECT CONSOLE IN/OUTPUT */
 118         /* FIXME: Use DOSDEV_Peek/Read/Write(DOSDEV_Console(),...) !! */
 119         if (DL_reg(context) == 0xff) {
 120             static char scan = 0;
 121             TRACE("Direct Console Input\n");
 122             if (scan) {
 123                 /* return pending scancode */
 124                 SET_AL( context, scan );
 125                 RESET_ZFLAG(context);
 126                 scan = 0;
 127             } else {
 128                 if (DOSVM_Int16ReadChar(&ascii,&scan,TRUE)) {
 129                     DOSVM_Int16ReadChar(&ascii,&scan,FALSE);
 130                     /* return ASCII code */
 131                     SET_AL( context, ascii );
 132                     RESET_ZFLAG(context);
 133                     /* return scan code on next call only if ascii==0 */
 134                     if (ascii) scan = 0;
 135                 } else {
 136                     /* nothing pending, clear everything */
 137                     SET_AL( context, 0 );
 138                     SET_ZFLAG(context);
 139                     scan = 0; /* just in case */
 140                 }
 141             }
 142         } else {
 143             TRACE("Direct Console Output\n");
 144             DOSVM_PutChar(DL_reg(context));
 145         }
 146         break;
 147
 148     case 0x07: /* DIRECT CHARACTER INPUT WITHOUT ECHO */
 149         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
 150         TRACE("DIRECT CHARACTER INPUT WITHOUT ECHO\n");
 151         DOSVM_Int16ReadChar(&ascii, NULL, FALSE);
 152         SET_AL( context, ascii );
 153         break;
 154
 155     case 0x08: /* CHARACTER INPUT WITHOUT ECHO */
 156         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
 157         TRACE("CHARACTER INPUT WITHOUT ECHO\n");
 158         DOSVM_Int16ReadChar(&ascii, NULL, FALSE);
 159         SET_AL( context, ascii );
 160         break;
 161
 162     case 0x0b: /* GET STDIN STATUS */
 163         {
 164             BIOSDATA *data = BIOS_DATA;
 165             if(data->FirstKbdCharPtr == data->NextKbdCharPtr)
 166                 SET_AL( context, 0 );
 167             else
 168                 SET_AL( context, 0xff );
 169         }
 170         break;
 171
 172     case 0x25: /* SET INTERRUPT VECTOR */
 173         DOSVM_SetRMHandler( AL_reg(context),
 174                             (FARPROC16)MAKESEGPTR( context->SegDs, DX_reg(context)));
 175         break;
 176
 177     case 0x35: /* GET INTERRUPT VECTOR */
 178         TRACE("GET INTERRUPT VECTOR 0x%02x\n",AL_reg(context));
 179         {
 180             FARPROC16 addr = DOSVM_GetRMHandler( AL_reg(context) );
 181             context->SegEs = SELECTOROF(addr);
 182             SET_BX( context, OFFSETOF(addr) );
 183         }
 184         break;
 185
 186     case 0x40: /* WRITE TO FILE OR DEVICE */
 187         /* Writes to stdout are handled here. */
 188         if (BX_reg(context) == 1) {
 189           BYTE *ptr = CTX_SEG_OFF_TO_LIN(context,
 190                                          context->SegDs,
 191                                          context->Edx);
 192           int i;
 193
 194           for(i=0; i<CX_reg(context); i++)
 195             DOSVM_PutChar(ptr[i]);
 196         } else
 197           DOS3Call( context );
 198         break;
 199
 200     case 0x44: /* IOCTL */
 201         DOSVM_Int21Handler_Ioctl( context );
 202         break;
 203
 204     case 0x4b: /* "EXEC" - LOAD AND/OR EXECUTE PROGRAM */
 205         TRACE("EXEC %s\n", (LPCSTR)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx ));
 206         if (!MZ_Exec( context, CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx),
 207                       AL_reg(context), CTX_SEG_OFF_TO_LIN(context, context->SegEs, context->Ebx) ))
 208         {
 209             SET_AX( context, GetLastError() );
 210             SET_CFLAG(context);
 211         }
 212         break;
 213
 214     case 0x4c: /* "EXIT" - TERMINATE WITH RETURN CODE */
 215         TRACE("EXIT with return code %d\n",AL_reg(context));
 216         MZ_Exit( context, FALSE, AL_reg(context) );
 217         break;
 218
 219     case 0x4d: /* GET RETURN CODE */
 220         TRACE("GET RETURN CODE (ERRORLEVEL)\n");
 221         SET_AX( context, DOSVM_retval );
 222         DOSVM_retval = 0;
 223         break;
 224
 225     case 0x50: /* SET CURRENT PROCESS ID (SET PSP ADDRESS) */
 226         TRACE("SET CURRENT PROCESS ID (SET PSP ADDRESS)\n");
 227         DOSVM_psp = BX_reg(context);
 228         break;
 229
 230     case 0x51: /* GET PSP ADDRESS */
 231         TRACE("GET CURRENT PROCESS ID (GET PSP ADDRESS)\n");
 232         /* FIXME: should we return the original DOS PSP upon */
 233         /*        Windows startup ? */
 234         SET_BX( context, DOSVM_psp );
 235         break;
 236
 237     case 0x52: /* "SYSVARS" - GET LIST OF LISTS */
 238         TRACE("SYSVARS - GET LIST OF LISTS\n");
 239         {
 240             context->SegEs = HIWORD(DOS_LOLSeg);
 241             SET_BX( context, FIELD_OFFSET(DOS_LISTOFLISTS, ptr_first_DPB) );
 242         }
 243         break;
 244
 245     case 0x62: /* GET PSP ADDRESS */
 246         TRACE("GET CURRENT PSP ADDRESS\n");
 247         /* FIXME: should we return the original DOS PSP upon */
 248         /*        Windows startup ? */
 249         SET_BX( context, DOSVM_psp );
 250         break;
 251
 252     default:
 253         DOS3Call( context );
 254     }
 255 }