dlls/winedos/int21.c

   1 /*
   2  * DOS interrupt 21h handler
   3  */
   4
   5 #include "config.h"
   6
   7 #include "windef.h"
   8 #include "winbase.h"
   9 #include "ntddk.h"
  10 #include "wine/winbase16.h"
  11 #include "dosexe.h"
  12 #include "miscemu.h"
  13 #include "msdos.h"
  14 #include "console.h"
  15 #include "debugtools.h"
  16
  17 DEFAULT_DEBUG_CHANNEL(int21);
  18
  19
  20 /***********************************************************************
  21  *           DOSVM_Int21Handler
  22  *
  23  * int 21h real-mode handler. Most calls are passed directly to DOS3Call.
  24  */
  25 void WINAPI DOSVM_Int21Handler( CONTEXT86 *context )
  26 {
  27     RESET_CFLAG(context);  /* Not sure if this is a good idea */
  28
  29     switch(AH_reg(context))
  30     {
  31     case 0x00: /* TERMINATE PROGRAM */
  32         TRACE("TERMINATE PROGRAM\n");
  33         MZ_Exit( context, FALSE, 0 );
  34         break;
  35
  36     case 0x01: /* READ CHARACTER FROM STANDARD INPUT, WITH ECHO */
  37         TRACE("DIRECT CHARACTER INPUT WITH ECHO\n");
  38         AL_reg(context) = CONSOLE_GetCharacter();
  39         /* FIXME: no echo */
  40         break;
  41
  42     case 0x02: /* WRITE CHARACTER TO STANDARD OUTPUT */
  43         TRACE("Write Character to Standard Output\n");
  44         CONSOLE_Write(DL_reg(context), 0, 0, 0);
  45         break;
  46
  47     case 0x06: /* DIRECT CONSOLE IN/OUTPUT */
  48         /* FIXME: Use DOSDEV_Peek/Read/Write(DOSDEV_Console(),...) !! */
  49         if (DL_reg(context) == 0xff) {
  50             static char scan = 0;
  51             TRACE("Direct Console Input\n");
  52             if (scan) {
  53                 /* return pending scancode */
  54                 AL_reg(context) = scan;
  55                 RESET_ZFLAG(context);
  56                 scan = 0;
  57             } else {
  58                 char ascii;
  59                 if (DOSVM_Int16ReadChar(&ascii,&scan,TRUE)) {
  60                     DOSVM_Int16ReadChar(&ascii,&scan,FALSE);
  61                     /* return ASCII code */
  62                     AL_reg(context) = ascii;
  63                     RESET_ZFLAG(context);
  64                     /* return scan code on next call only if ascii==0 */
  65                     if (ascii) scan = 0;
  66                 } else {
  67                     /* nothing pending, clear everything */
  68                     AL_reg(context) = 0;
  69                     SET_ZFLAG(context);
  70                     scan = 0; /* just in case */
  71                 }
  72             }
  73         } else {
  74             TRACE("Direct Console Output\n");
  75             CONSOLE_Write(DL_reg(context), 0, 0, 0);
  76         }
  77         break;
  78
  79     case 0x07: /* DIRECT CHARACTER INPUT WITHOUT ECHO */
  80         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
  81         TRACE("DIRECT CHARACTER INPUT WITHOUT ECHO\n");
  82         DOSVM_Int16ReadChar(&AL_reg(context), NULL, FALSE);
  83         break;
  84
  85     case 0x08: /* CHARACTER INPUT WITHOUT ECHO */
  86         /* FIXME: Use DOSDEV_Peek/Read(DOSDEV_Console(),...) !! */
  87         TRACE("CHARACTER INPUT WITHOUT ECHO\n");
  88         DOSVM_Int16ReadChar(&AL_reg(context), NULL, FALSE);
  89         break;
  90
  91     case 0x0b: /* GET STDIN STATUS */
  92         {
  93             char x1,x2;
  94
  95             if (CONSOLE_CheckForKeystroke(&x1,&x2))
  96                 AL_reg(context) = 0xff;
  97             else
  98                 AL_reg(context) = 0;
  99         }
 100         break;
 101
 102     case 0x25: /* SET INTERRUPT VECTOR */
 103         DOSVM_SetRMHandler( AL_reg(context),
 104                             (FARPROC16)MAKESEGPTR( context->SegDs, DX_reg(context)));
 105         break;
 106
 107     case 0x35: /* GET INTERRUPT VECTOR */
 108         TRACE("GET INTERRUPT VECTOR 0x%02x\n",AL_reg(context));
 109         {
 110             FARPROC16 addr = DOSVM_GetRMHandler( AL_reg(context) );
 111             context->SegEs = SELECTOROF(addr);
 112             BX_reg(context) = OFFSETOF(addr);
 113         }
 114         break;
 115
 116     case 0x44: /* IOCTL */
 117         switch (AL_reg(context))
 118         {
 119         case 0x0b:   /* SET SHARING RETRY COUNT */
 120             TRACE("IOCTL - SET SHARING RETRY COUNT pause %d retries %d\n",
 121                   CX_reg(context), DX_reg(context));
 122             if (!CX_reg(context))
 123             {
 124                 AX_reg(context) = 1;
 125                 SET_CFLAG(context);
 126                 break;
 127             }
 128             DOSMEM_LOL()->sharing_retry_delay = CX_reg(context);
 129             if (!DX_reg(context))
 130                 DOSMEM_LOL()->sharing_retry_count = DX_reg(context);
 131             RESET_CFLAG(context);
 132             break;
 133         }
 134         break;
 135
 136     case 0x4b: /* "EXEC" - LOAD AND/OR EXECUTE PROGRAM */
 137         TRACE("EXEC %s\n", (LPCSTR)CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx ));
 138         if (!MZ_Exec( context, CTX_SEG_OFF_TO_LIN(context, context->SegDs, context->Edx),
 139                       AL_reg(context), CTX_SEG_OFF_TO_LIN(context, context->SegEs, context->Ebx) ))
 140         {
 141             AX_reg(context) = GetLastError();
 142             SET_CFLAG(context);
 143         }
 144         break;
 145
 146     case 0x4c: /* "EXIT" - TERMINATE WITH RETURN CODE */
 147         TRACE("EXIT with return code %d\n",AL_reg(context));
 148         MZ_Exit( context, FALSE, AL_reg(context) );
 149         break;
 150
 151     case 0x4d: /* GET RETURN CODE */
 152         TRACE("GET RETURN CODE (ERRORLEVEL)\n");
 153         AX_reg(context) = DOSVM_retval;
 154         DOSVM_retval = 0;
 155         break;
 156
 157     case 0x50: /* SET CURRENT PROCESS ID (SET PSP ADDRESS) */
 158         TRACE("SET CURRENT PROCESS ID (SET PSP ADDRESS)\n");
 159         DOSVM_psp = BX_reg(context);
 160         break;
 161
 162     case 0x51: /* GET PSP ADDRESS */
 163         TRACE("GET CURRENT PROCESS ID (GET PSP ADDRESS)\n");
 164         /* FIXME: should we return the original DOS PSP upon */
 165         /*        Windows startup ? */
 166         BX_reg(context) = DOSVM_psp;
 167         break;
 168
 169     case 0x52: /* "SYSVARS" - GET LIST OF LISTS */
 170         TRACE("SYSVARS - GET LIST OF LISTS\n");
 171         {
 172             context->SegEs = HIWORD(DOS_LOLSeg);
 173             BX_reg(context) = FIELD_OFFSET(DOS_LISTOFLISTS, ptr_first_DPB);
 174         }
 175         break;
 176
 177     case 0x62: /* GET PSP ADDRESS */
 178         TRACE("GET CURRENT PSP ADDRESS\n");
 179         /* FIXME: should we return the original DOS PSP upon */
 180         /*        Windows startup ? */
 181         BX_reg(context) = DOSVM_psp;
 182         break;
 183
 184     default:
 185         DOS3Call( context );
 186     }
 187 }