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 "dosexe.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       INT_Int16ReadChar(&AL_reg(context), &AH_reg(context), FALSE);
  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 (!INT_Int16ReadChar(&AL_reg(context), &AH_reg(context), TRUE))
  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 0  /* FIXME: cannot call USER functions here */
  62       if (GetAsyncKeyState(VK_RSHIFT))
  63           AL_reg(context) |= 0x01;
  64       if (GetAsyncKeyState(VK_LSHIFT))
  65           AL_reg(context) |= 0x02;
  66       if (GetAsyncKeyState(VK_LCONTROL) || GetAsyncKeyState(VK_RCONTROL))
  67           AL_reg(context) |= 0x04;
  68       if (GetAsyncKeyState(VK_LMENU) || GetAsyncKeyState(VK_RMENU))
  69           AL_reg(context) |= 0x08;
  70       if (GetAsyncKeyState(VK_SCROLL))
  71           AL_reg(context) |= 0x10;
  72       if (GetAsyncKeyState(VK_NUMLOCK))
  73           AL_reg(context) |= 0x20;
  74       if (GetAsyncKeyState(VK_CAPITAL))
  75           AL_reg(context) |= 0x40;
  76       if (GetAsyncKeyState(VK_INSERT))
  77           AL_reg(context) |= 0x80;
  78 #endif
  79       TRACE("Get Shift Flags: returning 0x%02x\n", AL_reg(context));
  80       break;
  81
  82    case 0x03: /* Set Typematic Rate and Delay */
  83       FIXME("Set Typematic Rate and Delay - Not Supported\n");
  84       break;
  85
  86    case 0x09: /* Get Keyboard Functionality */
  87       FIXME("Get Keyboard Functionality - Not Supported\n");
  88       /* As a temporary measure, say that "nothing" is supported... */
  89       AL_reg(context) = 0;
  90       break;
  91
  92    case 0x0a: /* Get Keyboard ID */
  93       FIXME("Get Keyboard ID - Not Supported\n");
  94       break;
  95
  96    case 0x10: /* Get Enhanced Keystroke */
  97       TRACE("Get Enhanced Keystroke - Partially supported\n");
  98       /* Returns: AH = Scan code
  99                   AL = ASCII character */
 100       INT_Int16ReadChar(&AL_reg(context), &AH_reg(context), FALSE);
 101       break;
 102
 103
 104    case 0x11: /* Check for Enhanced Keystroke */
 105       /* Returns: ZF set if no keystroke */
 106       /*          AH = Scan code */
 107       /*          AL = ASCII character */
 108       TRACE("Check for Enhanced Keystroke - Partially supported\n");
 109       if (!INT_Int16ReadChar(&AL_reg(context), &AH_reg(context), TRUE))
 110       {
 111           SET_ZFLAG(context);
 112       }
 113       else
 114       {
 115           RESET_ZFLAG(context);
 116       }
 117       break;
 118
 119    case 0x12: /* Get Extended Shift States */
 120       FIXME("Get Extended Shift States - Not Supported\n");
 121       break;
 122
 123    default:
 124       FIXME("Unknown INT 16 function - 0x%x\n", AH_reg(context));
 125       break;
 126
 127    }
 128 }
 129
 130 int WINAPI INT_Int16ReadChar(BYTE*ascii,BYTE*scan,BOOL peek)
 131 {
 132   BIOSDATA *data = DOSMEM_BiosData();
 133   WORD CurOfs = data->NextKbdCharPtr;
 134
 135   /* check if there's data in buffer */
 136   if (peek) {
 137     if (CurOfs == data->FirstKbdCharPtr)
 138       return 0;
 139   } else {
 140     while (CurOfs == data->FirstKbdCharPtr) {
 141       /* no input available yet, so wait... */
 142       DOSVM_Wait( -1, 0 );
 143     }
 144   }
 145   /* read from keyboard queue */
 146   TRACE("(%p,%p,%d) -> %02x %02x\n",ascii,scan,peek,((BYTE*)data)[CurOfs],((BYTE*)data)[CurOfs+1]);
 147   if (ascii) *ascii = ((BYTE*)data)[CurOfs];
 148   if (scan) *scan = ((BYTE*)data)[CurOfs+1];
 149   if (!peek) {
 150     CurOfs += 2;
 151     if (CurOfs >= data->KbdBufferEnd) CurOfs = data->KbdBufferStart;
 152     data->NextKbdCharPtr = CurOfs;
 153   }
 154   return 1;
 155 }
 156
 157 int WINAPI INT_Int16AddChar(BYTE ascii,BYTE scan)
 158 {
 159   BIOSDATA *data = DOSMEM_BiosData();
 160   WORD CurOfs = data->FirstKbdCharPtr;
 161   WORD NextOfs = CurOfs + 2;
 162
 163   TRACE("(%02x,%02x)\n",ascii,scan);
 164   if (NextOfs >= data->KbdBufferEnd) NextOfs = data->KbdBufferStart;
 165   /* check if buffer is full */
 166   if (NextOfs == data->NextKbdCharPtr) return 0;
 167
 168   /* okay, insert character in ring buffer */
 169   ((BYTE*)data)[CurOfs] = ascii;
 170   ((BYTE*)data)[CurOfs+1] = scan;
 171
 172   data->FirstKbdCharPtr = NextOfs;
 173   return 1;
 174 }