wine/dlls/winedos/int16.c

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/*
* DOS interrupt 16h handler
*
* Copyright 1998 Joseph Pranevich
* Copyright 1999 Ove Kåven
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#include "dosexe.h"
#include "wincon.h"
#include "wine/debug.h"
#include "windef.h"
#include "wingdi.h"
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#include "winuser.h"
WINE_DEFAULT_DEBUG_CHANNEL(int);
/**********************************************************************
* DOSVM_Int16Handler (WINEDOS16.122)
*
* Handler for int 16h (keyboard)
*
* NOTE:
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*
* KEYB.COM (DOS >3.2) adds functions to this interrupt, they are
* not currently listed here.
*/
void WINAPI DOSVM_Int16Handler( CONTEXT86 *context )
{
BIOSDATA *data = NULL;
BYTE ascii, scan;
switch AH_reg(context) {
case 0x00: /* Get Keystroke */
/* Returns: AH = Scan code
AL = ASCII character */
TRACE("Get Keystroke\n");
DOSVM_Int16ReadChar(&ascii, &scan, context);
SET_AL( context, ascii );
SET_AH( context, scan );
break;
case 0x01: /* Check for Keystroke */
/* Returns: ZF set if no keystroke */
/* AH = Scan code */
/* AL = ASCII character */
TRACE("Check for Keystroke\n");
if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
{
SET_ZFLAG(context);
}
else
{
SET_AL( context, ascii );
SET_AH( context, scan );
RESET_ZFLAG(context);
}
/* don't miss the opportunity to break some tight timing loop in DOS
* programs causing 100% CPU usage (by doing a Sleep here) */
Sleep(5);
break;
case 0x02: /* Get Shift Flags */
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/* read value from BIOS data segment's keyboard status flags field */
data = DOSVM_BiosData();
SET_AL( context, data->KbdFlags1 );
TRACE("Get Shift Flags: returning 0x%02x\n", AL_reg(context));
break;
case 0x03: /* Set Typematic Rate and Delay */
FIXME("Set Typematic Rate and Delay - Not Supported\n");
break;
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case 0x05:/*simulate Keystroke*/
FIXME("Simulating a keystroke is not supported yet\n");
break;
case 0x09: /* Get Keyboard Functionality */
FIXME("Get Keyboard Functionality - Not Supported\n");
/* As a temporary measure, say that "nothing" is supported... */
SET_AL( context, 0 );
break;
case 0x0a: /* Get Keyboard ID */
FIXME("Get Keyboard ID - Not Supported\n");
break;
case 0x10: /* Get Enhanced Keystroke */
TRACE("Get Enhanced Keystroke - Partially supported\n");
/* Returns: AH = Scan code
AL = ASCII character */
DOSVM_Int16ReadChar(&ascii, &scan, context);
SET_AL( context, ascii );
SET_AH( context, scan );
break;
case 0x11: /* Check for Enhanced Keystroke */
/* Returns: ZF set if no keystroke */
/* AH = Scan code */
/* AL = ASCII character */
TRACE("Check for Enhanced Keystroke - Partially supported\n");
if (!DOSVM_Int16ReadChar(&ascii, &scan, NULL))
{
SET_ZFLAG(context);
}
else
{
SET_AL( context, ascii );
SET_AH( context, scan );
RESET_ZFLAG(context);
}
break;
case 0x12: /* Get Extended Shift States */
FIXME("Get Extended Shift States - Not Supported\n");
break;
default:
FIXME("Unknown INT 16 function - 0x%x\n", AH_reg(context));
break;
}
}
/**********************************************************************
* DOSVM_Int16ReadChar
*
* Either peek into keyboard buffer or wait for next keystroke.
*
* If waitctx is NULL, return TRUE if buffer had keystrokes and
* FALSE if buffer is empty. Returned keystroke will be left into buffer.
*
* If waitctx is non-NULL, wait until keystrokes are available.
* Return value will always be TRUE and returned keystroke will be
* removed from buffer.
*/
int WINAPI DOSVM_Int16ReadChar(BYTE *ascii, BYTE *scan, CONTEXT86 *waitctx)
{
BIOSDATA *data = DOSVM_BiosData();
WORD CurOfs = data->NextKbdCharPtr;
/* check if there's data in buffer */
if (waitctx)
{
/* wait until input is available... */
while (CurOfs == data->FirstKbdCharPtr)
DOSVM_Wait( waitctx );
}
else
{
if (CurOfs == data->FirstKbdCharPtr)
return FALSE;
}
/* read from keyboard queue */
TRACE( "(%p,%p,%p) -> %02x %02x\n", ascii, scan, waitctx,
((BYTE*)data)[CurOfs], ((BYTE*)data)[CurOfs+1] );
if (ascii) *ascii = ((BYTE*)data)[CurOfs];
if (scan) *scan = ((BYTE*)data)[CurOfs+1];
if (waitctx)
{
CurOfs += 2;
if (CurOfs >= data->KbdBufferEnd) CurOfs = data->KbdBufferStart;
data->NextKbdCharPtr = CurOfs;
}
return TRUE;
}
int WINAPI DOSVM_Int16AddChar(BYTE ascii,BYTE scan)
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{
BIOSDATA *data = DOSVM_BiosData();
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WORD CurOfs = data->FirstKbdCharPtr;
WORD NextOfs = CurOfs + 2;
TRACE("(%02x,%02x)\n",ascii,scan);
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if (NextOfs >= data->KbdBufferEnd) NextOfs = data->KbdBufferStart;
/* check if buffer is full */
if (NextOfs == data->NextKbdCharPtr) return 0;
/* okay, insert character in ring buffer */
((BYTE*)data)[CurOfs] = ascii;
((BYTE*)data)[CurOfs+1] = scan;
data->FirstKbdCharPtr = NextOfs;
return 1;
}