msdos/int16.c

   1 /*
   2  * DOS interrupt 16h handler
   3  */
   4
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include <unistd.h>
   8
   9 #include "config.h"
  10 #include "module.h"
  11 #include "console.h"
  12 #include "wincon.h"
  13 #include "debugtools.h"
  14 #include "windef.h"
  15 #include "wingdi.h"
  16 #include "winuser.h"
  17 #include "miscemu.h"
  18
  19 DEFAULT_DEBUG_CHANNEL(int16)
  20
  21 /**********************************************************************
  22  *          INT_Int16Handler
  23  *
  24  * Handler for int 16h (keyboard)
  25  *
  26  * NOTE:
  27  *
  28  *    KEYB.COM (DOS >3.2) adds functions to this interrupt, they are
  29  *    not currently listed here.
  30  */
  31
  32 void WINAPI INT_Int16Handler( CONTEXT86 *context )
  33 {
  34    switch AH_reg(context) {
  35
  36    case 0x00: /* Get Keystroke */
  37       /* Returns: AH = Scan code
  38                   AL = ASCII character */
  39       TRACE("Get Keystroke\n");
  40       CONSOLE_GetKeystroke(&AH_reg(context), &AL_reg(context));
  41       break;
  42
  43    case 0x01: /* Check for Keystroke */
  44       /* Returns: ZF set if no keystroke */
  45       /*          AH = Scan code */
  46       /*          AL = ASCII character */
  47       TRACE("Check for Keystroke\n");
  48       if (!CONSOLE_CheckForKeystroke(&AH_reg(context), &AL_reg(context)))
  49       {
  50           SET_ZFLAG(context);
  51       }
  52       else
  53       {
  54           RESET_ZFLAG(context);
  55       }
  56       break;
  57
  58    case 0x02: /* Get Shift Flags */
  59       AL_reg(context) = 0;
  60
  61       if (GetAsyncKeyState(VK_RSHIFT))
  62           AL_reg(context) |= 0x01;
  63       if (GetAsyncKeyState(VK_LSHIFT))
  64           AL_reg(context) |= 0x02;
  65       if (GetAsyncKeyState(VK_LCONTROL) || GetAsyncKeyState(VK_RCONTROL))
  66           AL_reg(context) |= 0x04;
  67       if (GetAsyncKeyState(VK_LMENU) || GetAsyncKeyState(VK_RMENU))
  68           AL_reg(context) |= 0x08;
  69       if (GetAsyncKeyState(VK_SCROLL))
  70           AL_reg(context) |= 0x10;
  71       if (GetAsyncKeyState(VK_NUMLOCK))
  72           AL_reg(context) |= 0x20;
  73       if (GetAsyncKeyState(VK_CAPITAL))
  74           AL_reg(context) |= 0x40;
  75       if (GetAsyncKeyState(VK_INSERT))
  76           AL_reg(context) |= 0x80;
  77       TRACE("Get Shift Flags: returning 0x%02x\n", AL_reg(context));
  78       break;
  79
  80    case 0x03: /* Set Typematic Rate and Delay */
  81       FIXME("Set Typematic Rate and Delay - Not Supported\n");
  82       break;
  83
  84    case 0x09: /* Get Keyboard Functionality */
  85       FIXME("Get Keyboard Functionality - Not Supported\n");
  86       /* As a temporary measure, say that "nothing" is supported... */
  87       AL_reg(context) = 0;
  88       break;
  89
  90    case 0x0a: /* Get Keyboard ID */
  91       FIXME("Get Keyboard ID - Not Supported\n");
  92       break;
  93
  94    case 0x10: /* Get Enhanced Keystroke */
  95       TRACE("Get Enhanced Keystroke - Partially supported\n");
  96       /* Returns: AH = Scan code
  97                   AL = ASCII character */
  98       CONSOLE_GetKeystroke(&AH_reg(context), &AL_reg(context));
  99       break;
 100
 101
 102    case 0x11: /* Check for Enhanced Keystroke */
 103       /* Returns: ZF set if no keystroke */
 104       /*          AH = Scan code */
 105       /*          AL = ASCII character */
 106       TRACE("Check for Enhanced Keystroke - Partially supported\n");
 107       if (!CONSOLE_CheckForKeystroke(&AH_reg(context), &AL_reg(context)))
 108       {
 109           SET_ZFLAG(context);
 110       }
 111       else
 112       {
 113           RESET_ZFLAG(context);
 114       }
 115       break;
 116
 117    case 0x12: /* Get Extended Shift States */
 118       FIXME("Get Extended Shift States - Not Supported\n");
 119       break;
 120
 121    default:
 122       FIXME("Unknown INT 16 function - 0x%x\n", AH_reg(context));
 123       break;
 124
 125    }
 126 }
 127
 128 int WINAPI INT_Int16ReadChar(BYTE*ascii,BYTE*scan,BOOL peek)
 129 {
 130   BIOSDATA *data = DOSMEM_BiosData();
 131   WORD CurOfs = data->NextKbdCharPtr;
 132
 133   /* check if there's data in buffer */
 134   if (peek) {
 135     if (CurOfs == data->FirstKbdCharPtr)
 136       return 0;
 137   } else {
 138     while (CurOfs == data->FirstKbdCharPtr) {
 139       /* no input available yet, so wait... */
 140       DOSVM_Wait( -1, 0 );
 141     }
 142   }
 143   /* read from keyboard queue */
 144   TRACE("(%p,%p,%d) -> %02x %02x\n",ascii,scan,peek,((BYTE*)data)[CurOfs],((BYTE*)data)[CurOfs+1]);
 145   if (ascii) *ascii = ((BYTE*)data)[CurOfs];
 146   if (scan) *scan = ((BYTE*)data)[CurOfs+1];
 147   if (!peek) {
 148     CurOfs += 2;
 149     if (CurOfs >= data->KbdBufferEnd) CurOfs = data->KbdBufferStart;
 150     data->NextKbdCharPtr = CurOfs;
 151   }
 152   return 1;
 153 }
 154
 155 int WINAPI INT_Int16AddChar(BYTE ascii,BYTE scan)
 156 {
 157   BIOSDATA *data = DOSMEM_BiosData();
 158   WORD CurOfs = data->FirstKbdCharPtr;
 159   WORD NextOfs = CurOfs + 2;
 160
 161   TRACE("(%02x,%02x)\n",ascii,scan);
 162   if (NextOfs >= data->KbdBufferEnd) NextOfs = data->KbdBufferStart;
 163   /* check if buffer is full */
 164   if (NextOfs == data->NextKbdCharPtr) return 0;
 165
 166   /* okay, insert character in ring buffer */
 167   ((BYTE*)data)[CurOfs] = ascii;
 168   ((BYTE*)data)[CurOfs+1] = scan;
 169
 170   data->FirstKbdCharPtr = NextOfs;
 171   return 1;
 172 }