dlls/krnl386.exe16/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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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
  37 WINE_DEFAULT_DEBUG_CHANNEL(int);
  38
  39 /**********************************************************************
  40  *          DOSVM_Int16Handler
  41  *
  42  * Handler for int 16h (keyboard)
  43  *
  44  * NOTE:
  45  *
  46  *    KEYB.COM (DOS >3.2) adds functions to this interrupt, they are
  47  *    not currently listed here.
  48  */
  49
  50 void WINAPI DOSVM_Int16Handler( CONTEXT *context )
  51 {
  52    BIOSDATA *data = NULL;
  53    BYTE ascii, scan;
  54
  55    switch AH_reg(context) {
  56
  57    case 0x00: /* Get Keystroke */
  58       /* Returns: AH = Scan code
  59                   AL = ASCII character */
  60       TRACE("Get Keystroke\n");
  61       DOSVM_Int16ReadChar(&ascii, &scan, context);
  62       SET_AL( context, ascii );
  63       SET_AH( context, scan );
  64       break;
  65
  66    case 0x01: /* Check for Keystroke */
  67       /* Returns: ZF set if no keystroke */
  68       /*          AH = Scan code */
  69       /*          AL = ASCII character */
  70       TRACE("Check for Keystroke\n");
  71       if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
  72       {
  73           SET_ZFLAG(context);
  74       }
  75       else
  76       {
  77           SET_AL( context, ascii );
  78           SET_AH( context, scan );
  79           RESET_ZFLAG(context);
  80       }
  81       /* don't miss the opportunity to break some tight timing loop in DOS
  82        * programs causing 100% CPU usage (by doing a Sleep here) */
  83       Sleep(5);
  84       break;
  85
  86    case 0x02: /* Get Shift Flags */
  87
  88       /* read value from BIOS data segment's keyboard status flags field */
  89       data = DOSVM_BiosData();
  90       SET_AL( context, data->KbdFlags1 );
  91
  92       TRACE("Get Shift Flags: returning 0x%02x\n", AL_reg(context));
  93       break;
  94
  95    case 0x03: /* Set Typematic Rate and Delay */
  96       FIXME("Set Typematic Rate and Delay - Not Supported\n");
  97       break;
  98
  99    case 0x05:/*simulate  Keystroke*/
 100       FIXME("Simulating a keystroke is not supported yet\n");
 101       break;
 102
 103    case 0x09: /* Get Keyboard Functionality */
 104       FIXME("Get Keyboard Functionality - Not Supported\n");
 105       /* As a temporary measure, say that "nothing" is supported... */
 106       SET_AL( context, 0 );
 107       break;
 108
 109    case 0x0a: /* Get Keyboard ID */
 110       FIXME("Get Keyboard ID - Not Supported\n");
 111       break;
 112
 113    case 0x10: /* Get Enhanced Keystroke */
 114       TRACE("Get Enhanced Keystroke - Partially supported\n");
 115       /* Returns: AH = Scan code
 116                   AL = ASCII character */
 117       DOSVM_Int16ReadChar(&ascii, &scan, context);
 118       SET_AL( context, ascii );
 119       SET_AH( context, scan );
 120       break;
 121
 122
 123    case 0x11: /* Check for Enhanced Keystroke */
 124       /* Returns: ZF set if no keystroke */
 125       /*          AH = Scan code */
 126       /*          AL = ASCII character */
 127       TRACE("Check for Enhanced Keystroke - Partially supported\n");
 128       if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
 129       {
 130           SET_ZFLAG(context);
 131       }
 132       else
 133       {
 134           SET_AL( context, ascii );
 135           SET_AH( context, scan );
 136           RESET_ZFLAG(context);
 137       }
 138       break;
 139
 140    case 0x12: /* Get Extended Shift States */
 141       FIXME("Get Extended Shift States - Not Supported\n");
 142       break;
 143
 144    default:
 145       FIXME("Unknown INT 16 function - 0x%x\n", AH_reg(context));
 146       break;
 147
 148    }
 149 }
 150
 151 /**********************************************************************
 152  *          DOSVM_Int16ReadChar
 153  *
 154  * Either peek into keyboard buffer or wait for next keystroke.
 155  *
 156  * If waitctx is NULL, return TRUE if buffer had keystrokes and
 157  * FALSE if buffer is empty. Returned keystroke will be left into buffer.
 158  *
 159  * If waitctx is non-NULL, wait until keystrokes are available.
 160  * Return value will always be TRUE and returned keystroke will be
 161  * removed from buffer.
 162  */
 163 int DOSVM_Int16ReadChar(BYTE *ascii, BYTE *scan, CONTEXT *waitctx)
 164 {
 165     BIOSDATA *data = DOSVM_BiosData();
 166     WORD CurOfs = data->NextKbdCharPtr;
 167
 168     /* check if there's data in buffer */
 169     if (waitctx)
 170     {
 171         /* wait until input is available... */
 172         while (CurOfs == data->FirstKbdCharPtr)
 173             DOSVM_Wait( waitctx );
 174     }
 175     else
 176     {
 177         if (CurOfs == data->FirstKbdCharPtr)
 178             return FALSE;
 179     }
 180
 181     /* read from keyboard queue */
 182     TRACE( "(%p,%p,%p) -> %02x %02x\n", ascii, scan, waitctx,
 183            ((BYTE*)data)[CurOfs], ((BYTE*)data)[CurOfs+1] );
 184
 185     if (ascii) *ascii = ((BYTE*)data)[CurOfs];
 186     if (scan) *scan = ((BYTE*)data)[CurOfs+1];
 187
 188     if (waitctx)
 189     {
 190         CurOfs += 2;
 191         if (CurOfs >= data->KbdBufferEnd) CurOfs = data->KbdBufferStart;
 192         data->NextKbdCharPtr = CurOfs;
 193     }
 194
 195     return TRUE;
 196 }
 197
 198 int DOSVM_Int16AddChar(BYTE ascii,BYTE scan)
 199 {
 200   BIOSDATA *data = DOSVM_BiosData();
 201   WORD CurOfs = data->FirstKbdCharPtr;
 202   WORD NextOfs = CurOfs + 2;
 203
 204   TRACE("(%02x,%02x)\n",ascii,scan);
 205   if (NextOfs >= data->KbdBufferEnd) NextOfs = data->KbdBufferStart;
 206   /* check if buffer is full */
 207   if (NextOfs == data->NextKbdCharPtr) return 0;
 208
 209   /* okay, insert character in ring buffer */
 210   ((BYTE*)data)[CurOfs] = ascii;
 211   ((BYTE*)data)[CurOfs+1] = scan;
 212
 213   data->FirstKbdCharPtr = NextOfs;
 214   return 1;
 215 }