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 "ntddk.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/debug.h"
  36
  37 WINE_DEFAULT_DEBUG_CHANNEL(int21);
  38
  39 void WINAPI DOSVM_Int21Handler_Ioctl( CONTEXT86 *context )
  40 {
  41   const DOS_DEVICE *dev = DOSFS_GetDeviceByHandle(
  42       DosFileHandleToWin32Handle(BX_reg(context)) );
  43
  44   if (dev && !strcasecmp( dev->name, "EMMXXXX0" )) {
  45     EMS_Ioctl_Handler(context);
  46     return;
  47   }
  48
  49   switch (AL_reg(context))
  50   {
  51   case 0x0b: /* SET SHARING RETRY COUNT */
  52       TRACE("IOCTL - SET SHARING RETRY COUNT pause %d retries %d\n",
  53            CX_reg(context), DX_reg(context));
  54       if (!CX_reg(context))
  55       {
  56          AX_reg(context) = 1;
  57          SET_CFLAG(context);
  58          break;
  59       }
  60       DOSMEM_LOL()->sharing_retry_delay = CX_reg(context);
  61       if (!DX_reg(context))
  62          DOSMEM_LOL()->sharing_retry_count = DX_reg(context);
  63       RESET_CFLAG(context);
  64       break;
  65   default:
  66       DOS3Call( context );
  67   }
  68 }
  69
  70 /***********************************************************************
  71  *           DOSVM_Int21Handler
  72  *
  73  * int 21h real-mode handler. Most calls are passed directly to DOS3Call.
  74  */
  75 void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
  76 {
  77     RESET_CFLAG(context);  /* Not sure if this is a good idea */
  78
  79     if(AH_reg(context) == 0x0c) /* FLUSH BUFFER AND READ STANDARD INPUT */
  80     {
  81         BYTE al = AL_reg(context); /* Input function to execute after flush. */
  82
  83         /* FIXME: buffers are not flushed */
  84
  85         /*
  86          * If AL is not one of 0x01, 0x06, 0x07, 0x08, or 0x0a,
  87          * the buffer is flushed but no input is attempted.
  88          */
  89         if(al != 0x01 && al != 0x06 && al != 0x07 && al != 0x08 && al != 0x0a)
  90             return;
  91
  92         AH_reg(context) = al;
  93     }
  94
  95     switch(AH_reg(context))
  96     {
  97     case 0x00: /* TERMINATE PROGRAM */
  98         TRACE("TERMINATE PROGRAM\n");
  99         MZ_Exit( context, FALSE, 0 );
 100         break;
 101
 102     case 0x01: /* READ CHARACTER FROM STANDARD INPUT, WITH ECHO */
 103         TRACE("DIRECT CHARACTER INPUT WITH ECHO\n");
 104         DOSVM_Int16ReadChar(&AL_reg(context), NULL, FALSE);
 105         DOSVM_PutChar(AL_reg(context));
 106         break;
 107
 108     case 0x02: /* WRITE CHARACTER TO STANDARD OUTPUT */
 109         TRACE("Write Character to Standard Output\n");
 110         DOSVM_PutChar(DL_reg(context));
 111         break;
 112
 113     case 0x06: /* DIRECT CONSOLE IN/OUTPUT */
 114         /* FIXME: Use DOSDEV_Peek/Read/Write(DOSDEV_Console(),...) !! */
 115         if (DL_reg(context) == 0xff) {
 116             static char scan = 0;
 117             TRACE("Direct Console Input\n");
 118             if (scan) {
 119                 /* return pending scancode */
 120                 AL_reg(context) = scan;
 121                 RESET_ZFLAG(context);
 122                 scan = 0;
 123             } else {
 124                 char ascii;
 125                 if (DOSVM_Int16ReadChar(&ascii,&scan,TRUE)) {
 126                     DOSVM_Int16ReadChar(&ascii,&scan,FALSE);
 127                     /* return ASCII code */
 128                     AL_reg(context) = ascii;
 129                     RESET_ZFLAG(context);
 130                     /* return scan code on next call only if ascii==0 */
 131                     if (ascii) scan = 0;
 132                 } else {
 133                     /* nothing pending, clear everything */
 134                     AL_reg(context) = 0;
 135                     SET_ZFLAG(context);
 136                     scan = 0; /* just in case */
 137                 }
 138             }
 139         } else {
 140             TRACE("Direct Console Output\n");
 141             DOSVM_PutChar(DL_reg(context));
 142         }
 143         break;
 144
 145     case 0x07: /* DIRECT CHARACTER INPUT WITHOUT ECHO */
 146         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
 147         TRACE("DIRECT CHARACTER INPUT WITHOUT ECHO\n");
 148         DOSVM_Int16ReadChar(&AL_reg(context), NULL, FALSE);
 149         break;
 150
 151     case 0x08: /* CHARACTER INPUT WITHOUT ECHO */
 152         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
 153         TRACE("CHARACTER INPUT WITHOUT ECHO\n");
 154         DOSVM_Int16ReadChar(&AL_reg(context), NULL, FALSE);
 155         break;
 156
 157     case 0x0b: /* GET STDIN STATUS */
 158         {
 159             BIOSDATA *data = DOSMEM_BiosData();
 160             if(data->FirstKbdCharPtr == data->NextKbdCharPtr)
 161                 AL_reg(context) = 0;
 162             else
 163                 AL_reg(context) = 0xff;
 164         }
 165         break;
 166
 167     case 0x25: /* SET INTERRUPT VECTOR */
 168         DOSVM_SetRMHandler( AL_reg(context),
 169                             (FARPROC16)MAKESEGPTR( context->SegDs, DX_reg(context)));
 170         break;
 171
 172     case 0x35: /* GET INTERRUPT VECTOR */
 173         TRACE("GET INTERRUPT VECTOR 0x%02x\n",AL_reg(context));
 174         {
 175             FARPROC16 addr = DOSVM_GetRMHandler( AL_reg(context) );
 176             context->SegEs = SELECTOROF(addr);
 177             BX_reg(context) = OFFSETOF(addr);
 178         }
 179         break;
 180
 181     case 0x40: /* WRITE TO FILE OR DEVICE */
 182         /* Writes to stdout are handled here. */
 183         if (BX_reg(context) == 1) {
 184           BYTE *ptr = CTX_SEG_OFF_TO_LIN(context,
 185                                          context->SegDs,
 186                                          context->Edx);
 187           int i;
 188
 189           for(i=0; i<CX_reg(context); i++)
 190             DOSVM_PutChar(ptr[i]);
 191         } else
 192           DOS3Call( context );
 193         break;
 194
 195     case 0x44: /* IOCTL */
 196         DOSVM_Int21Handler_Ioctl( context );
 197         break;
 198
 199     case 0x4b: /* "EXEC" - LOAD AND/OR EXECUTE PROGRAM */
 200         TRACE("EXEC %s\n", (LPCSTR)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx ));
 201         if (!MZ_Exec( context, CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx),
 202                       AL_reg(context), CTX_SEG_OFF_TO_LIN(context, context->SegEs, context->Ebx) ))
 203         {
 204             AX_reg(context) = GetLastError();
 205             SET_CFLAG(context);
 206         }
 207         break;
 208
 209     case 0x4c: /* "EXIT" - TERMINATE WITH RETURN CODE */
 210         TRACE("EXIT with return code %d\n",AL_reg(context));
 211         MZ_Exit( context, FALSE, AL_reg(context) );
 212         break;
 213
 214     case 0x4d: /* GET RETURN CODE */
 215         TRACE("GET RETURN CODE (ERRORLEVEL)\n");
 216         AX_reg(context) = DOSVM_retval;
 217         DOSVM_retval = 0;
 218         break;
 219
 220     case 0x50: /* SET CURRENT PROCESS ID (SET PSP ADDRESS) */
 221         TRACE("SET CURRENT PROCESS ID (SET PSP ADDRESS)\n");
 222         DOSVM_psp = BX_reg(context);
 223         break;
 224
 225     case 0x51: /* GET PSP ADDRESS */
 226         TRACE("GET CURRENT PROCESS ID (GET PSP ADDRESS)\n");
 227         /* FIXME: should we return the original DOS PSP upon */
 228         /*        Windows startup ? */
 229         BX_reg(context) = DOSVM_psp;
 230         break;
 231
 232     case 0x52: /* "SYSVARS" - GET LIST OF LISTS */
 233         TRACE("SYSVARS - GET LIST OF LISTS\n");
 234         {
 235             context->SegEs = HIWORD(DOS_LOLSeg);
 236             BX_reg(context) = FIELD_OFFSET(DOS_LISTOFLISTS, ptr_first_DPB);
 237         }
 238         break;
 239
 240     case 0x62: /* GET PSP ADDRESS */
 241         TRACE("GET CURRENT PSP ADDRESS\n");
 242         /* FIXME: should we return the original DOS PSP upon */
 243         /*        Windows startup ? */
 244         BX_reg(context) = DOSVM_psp;
 245         break;
 246
 247     default:
 248         DOS3Call( context );
 249     }
 250 }