dlls/winedos/int16.c

   1 /*
   2  * DOS interrupt 16h handler
   3  *
   4  * Copyright 1998 Joseph Pranevich
   5  * Copyright 1999 Ove Kåven
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20  */
  21
  22 #include "config.h"
  23
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29
  30 #include "dosexe.h"
  31 #include "wincon.h"
  32 #include "wine/debug.h"
  33 #include "windef.h"
  34 #include "wingdi.h"
  35 #include "winuser.h"
  36 #include "miscemu.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(int);
  39
  40 /**********************************************************************
  41  *          DOSVM_Int16Handler (WINEDOS16.122)
  42  *
  43  * Handler for int 16h (keyboard)
  44  *
  45  * NOTE:
  46  *
  47  *    KEYB.COM (DOS >3.2) adds functions to this interrupt, they are
  48  *    not currently listed here.
  49  */
  50
  51 void WINAPI DOSVM_Int16Handler( CONTEXT86 *context )
  52 {
  53    BIOSDATA *data = NULL;
  54    BYTE ascii, scan;
  55
  56    switch AH_reg(context) {
  57
  58    case 0x00: /* Get Keystroke */
  59       /* Returns: AH = Scan code
  60                   AL = ASCII character */
  61       TRACE("Get Keystroke\n");
  62       DOSVM_Int16ReadChar(&ascii, &scan, context);
  63       SET_AL( context, ascii );
  64       SET_AH( context, scan );
  65       break;
  66
  67    case 0x01: /* Check for Keystroke */
  68       /* Returns: ZF set if no keystroke */
  69       /*          AH = Scan code */
  70       /*          AL = ASCII character */
  71       TRACE("Check for Keystroke\n");
  72       if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
  73       {
  74           SET_ZFLAG(context);
  75       }
  76       else
  77       {
  78           SET_AL( context, ascii );
  79           SET_AH( context, scan );
  80           RESET_ZFLAG(context);
  81       }
  82       /* don't miss the opportunity to break some tight timing loop in DOS
  83        * programs causing 100% CPU usage (by doing a Sleep here) */
  84       Sleep(5);
  85       break;
  86
  87    case 0x02: /* Get Shift Flags */
  88
  89       /* read value from BIOS data segment's keyboard status flags field */
  90       data = DOSVM_BiosData();
  91       SET_AL( context, data->KbdFlags1 );
  92
  93       TRACE("Get Shift Flags: returning 0x%02x\n", AL_reg(context));
  94       break;
  95
  96    case 0x03: /* Set Typematic Rate and Delay */
  97       FIXME("Set Typematic Rate and Delay - Not Supported\n");
  98       break;
  99
 100    case 0x09: /* Get Keyboard Functionality */
 101       FIXME("Get Keyboard Functionality - Not Supported\n");
 102       /* As a temporary measure, say that "nothing" is supported... */
 103       SET_AL( context, 0 );
 104       break;
 105
 106    case 0x0a: /* Get Keyboard ID */
 107       FIXME("Get Keyboard ID - Not Supported\n");
 108       break;
 109
 110    case 0x10: /* Get Enhanced Keystroke */
 111       TRACE("Get Enhanced Keystroke - Partially supported\n");
 112       /* Returns: AH = Scan code
 113                   AL = ASCII character */
 114       DOSVM_Int16ReadChar(&ascii, &scan, context);
 115       SET_AL( context, ascii );
 116       SET_AH( context, scan );
 117       break;
 118
 119
 120    case 0x11: /* Check for Enhanced Keystroke */
 121       /* Returns: ZF set if no keystroke */
 122       /*          AH = Scan code */
 123       /*          AL = ASCII character */
 124       TRACE("Check for Enhanced Keystroke - Partially supported\n");
 125       if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
 126       {
 127           SET_ZFLAG(context);
 128       }
 129       else
 130       {
 131           SET_AL( context, ascii );
 132           SET_AH( context, scan );
 133           RESET_ZFLAG(context);
 134       }
 135       break;
 136
 137    case 0x12: /* Get Extended Shift States */
 138       FIXME("Get Extended Shift States - Not Supported\n");
 139       break;
 140
 141    default:
 142       FIXME("Unknown INT 16 function - 0x%x\n", AH_reg(context));
 143       break;
 144
 145    }
 146 }
 147
 148 /**********************************************************************
 149  *          DOSVM_Int16ReadChar
 150  *
 151  * Either peek into keyboard buffer or wait for next keystroke.
 152  *
 153  * If waitctx is NULL, return TRUE if buffer had keystrokes and
 154  * FALSE if buffer is empty. Returned keystroke will be left into buffer.
 155  *
 156  * If waitctx is non-NULL, wait until keystrokes are available.
 157  * Return value will always be TRUE and returned keystroke will be
 158  * removed from buffer.
 159  */
 160 int WINAPI DOSVM_Int16ReadChar(BYTE *ascii, BYTE *scan, CONTEXT86 *waitctx)
 161 {
 162     BIOSDATA *data = DOSVM_BiosData();
 163     WORD CurOfs = data->NextKbdCharPtr;
 164
 165     /* check if there's data in buffer */
 166     if (waitctx)
 167     {
 168         /* wait until input is available... */
 169         while (CurOfs == data->FirstKbdCharPtr)
 170             DOSVM_Wait( waitctx );
 171     }
 172     else
 173     {
 174         if (CurOfs == data->FirstKbdCharPtr)
 175             return FALSE;
 176     }
 177
 178     /* read from keyboard queue */
 179     TRACE( "(%p,%p,%p) -> %02x %02x\n", ascii, scan, waitctx,
 180            ((BYTE*)data)[CurOfs], ((BYTE*)data)[CurOfs+1] );
 181
 182     if (ascii) *ascii = ((BYTE*)data)[CurOfs];
 183     if (scan) *scan = ((BYTE*)data)[CurOfs+1];
 184
 185     if (waitctx)
 186     {
 187         CurOfs += 2;
 188         if (CurOfs >= data->KbdBufferEnd) CurOfs = data->KbdBufferStart;
 189         data->NextKbdCharPtr = CurOfs;
 190     }
 191
 192     return TRUE;
 193 }
 194
 195 int WINAPI DOSVM_Int16AddChar(BYTE ascii,BYTE scan)
 196 {
 197   BIOSDATA *data = DOSVM_BiosData();
 198   WORD CurOfs = data->FirstKbdCharPtr;
 199   WORD NextOfs = CurOfs + 2;
 200
 201   TRACE("(%02x,%02x)\n",ascii,scan);
 202   if (NextOfs >= data->KbdBufferEnd) NextOfs = data->KbdBufferStart;
 203   /* check if buffer is full */
 204   if (NextOfs == data->NextKbdCharPtr) return 0;
 205
 206   /* okay, insert character in ring buffer */
 207   ((BYTE*)data)[CurOfs] = ascii;
 208   ((BYTE*)data)[CurOfs+1] = scan;
 209
 210   data->FirstKbdCharPtr = NextOfs;
 211   return 1;
 212 }