From: deus AT mpsi DOT net
Newsgroups: comp.os.msdos.djgpp
Subject: keyboard handler
Date: Fri, 20 Nov 1998 21:20:37 GMT
Organization: Deja News - The Leader in Internet Discussion
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To: djgpp AT delorie DOT com
DJ-Gateway: from newsgroup comp.os.msdos.djgpp
Reply-To: djgpp AT delorie DOT com

Hello everyone,

I'm trying to port some of my code from Watcom C/C++ to DJGPP.

I seem to be stuck on how to convert my keyboard handler.  Here's what it
looks like in Watcom:

   // holds the old interrupt
   void (__interrupt __far *oldint9h)();

   // holds key statuses
   volatile unsigned char key[256];

   // new custom interrupt
   void __interrupt __far myint9h()
   {
      register unsigned char keyinfo;
      keyinfo = (unsigned char)inp(0x60);  // inp() is the same as inportb()
      if(keyinfo==0xE0 || keyinfo==0xE1)
      {
         outp(0x20, 0x20);  // outp() is the same as outportb()
         return;
      }
      key[keyinfo & (~0x80)] = keyinfo>>7;
      outp(0x20, 0x20);
   }

   void main(void)
   {
      // save old interrupt
      oldint9h = _dos_getvect(0x9);

      // point vector to new custom routine
      _dos_setvect(0x9,myint9h);

      // init key statuses to unpressed
      for(int clear=0; clear<256; clear++) key[clear]=1;
      :
      :
      :
      // point vector to old handler
      _dos_setvect(0x9,oldint9h);
   }

I realize my handler is too simple to be robust (suggestions are welcome) but
for now, it serves its purpose.  My question is, how do I get and set the
interrupt vector in DJGPP?  Am I going to run into any other problems with
this code in DJGPP?


TIA


                                                                    deus

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