msdos/int09.c

   1 /*
   2  * DOS interrupt 09h handler (IRQ1 - KEYBOARD)
   3  */
   4
   5 #include <stdlib.h>
   6 #include <string.h>
   7 #include "windef.h"
   8 #include "wingdi.h"
   9 #include "winuser.h"
  10 #include "miscemu.h"
  11 #include "debugtools.h"
  12 #include "dosexe.h"
  13
  14 DEFAULT_DEBUG_CHANNEL(int);
  15
  16 #define QUEUELEN 31
  17
  18 static struct
  19 {
  20   BYTE queuelen,queue[QUEUELEN],ascii[QUEUELEN];
  21 } kbdinfo;
  22
  23
  24 /**********************************************************************
  25  *          INT_Int09Handler
  26  *
  27  * Handler for int 09h.
  28  */
  29 void WINAPI INT_Int09Handler( CONTEXT86 *context )
  30 {
  31   BYTE ascii, scan = INT_Int09ReadScan(&ascii);
  32   BYTE ch[2];
  33   int cnt, c2;
  34
  35   TRACE("scan=%02x\n",scan);
  36   if (!(scan & 0x80)) {
  37     if (ascii) {
  38       /* we already have an ASCII code, no translation necessary */
  39       ch[0] = ascii;
  40       cnt = 1;
  41     } else {
  42 #if 0  /* FIXME: cannot call USER functions here */
  43       UINT vkey = MapVirtualKeyA(scan&0x7f, 1);
  44       /* as in TranslateMessage, windows/input.c */
  45       cnt = ToAscii(vkey, scan, QueueKeyStateTable, (LPWORD)ch, 0);
  46 #else
  47       cnt = 0;
  48 #endif
  49     }
  50     if (cnt>0) {
  51       for (c2=0; c2<cnt; c2++)
  52         INT_Int16AddChar(ch[c2], scan);
  53     } else
  54     if (cnt==0) {
  55       /* FIXME: need to handle things like shift-F-keys,
  56        * 0xE0 extended keys, etc */
  57       INT_Int16AddChar(0, scan);
  58     }
  59   }
  60   DOSVM_PIC_ioport_out(0x20, 0x20); /* send EOI */
  61 }
  62
  63 static void KbdRelay( CONTEXT86 *context, void *data )
  64 {
  65   if (kbdinfo.queuelen) {
  66     /* cleanup operation, called from DOSVM_PIC_ioport_out:
  67      * we'll remove current scancode from keyboard buffer here,
  68      * rather than in ReadScan, because some DOS apps depend on
  69      * the scancode being available for reading multiple times... */
  70     if (--kbdinfo.queuelen) {
  71       memmove(kbdinfo.queue,kbdinfo.queue+1,kbdinfo.queuelen);
  72       memmove(kbdinfo.ascii,kbdinfo.ascii+1,kbdinfo.queuelen);
  73     }
  74   }
  75 }
  76
  77 void WINAPI INT_Int09SendScan( BYTE scan, BYTE ascii )
  78 {
  79   if (kbdinfo.queuelen == QUEUELEN) {
  80     ERR("keyboard queue overflow\n");
  81     return;
  82   }
  83   /* add scancode to queue */
  84   kbdinfo.queue[kbdinfo.queuelen] = scan;
  85   kbdinfo.ascii[kbdinfo.queuelen++] = ascii;
  86   /* tell app to read it by triggering IRQ 1 (int 09) */
  87   DOSVM_QueueEvent(1,DOS_PRIORITY_KEYBOARD,KbdRelay,NULL);
  88 }
  89
  90 BYTE WINAPI INT_Int09ReadScan( BYTE*ascii )
  91 {
  92     if (ascii) *ascii = kbdinfo.ascii[0];
  93     return kbdinfo.queue[0];
  94 }