www.pudn.com > virtual_gameboy-0.8.8.zip > KEYS.C

/* Keys.c 
   This file is part of the VGB-DOS project 
   Copyright (C) Marcel de Kogel (m.dekogel@student.utwente.nl), 1996 
   You may not use this file for commercial purposes 
   Please notify me if you make any changes to this file */ 
 
#include  
#include  
#include  
#include  
#include  
#include  
 
int _crt0_startup_flags = _CRT0_FLAG_NONMOVE_SBRK | 
                          _CRT0_FLAG_LOCK_MEMORY  | 
                          _CRT0_FLAG_DROP_EXE_SUFFIX; 
 
 
static __volatile__ int key=0; 
static _go32_dpmi_seginfo newirqkeyb,oldirqkeyb; 
 
void keyb_interrupt (void) 
{ 
 unsigned code; 
 static int extkey; 
 code=inportb (0x60);           /* get scancode */ 
 if (code<0xE0)                 /* ignore codes >0xE0 */ 
 { 
  if (code & 0x80)              /* key is released */ 
   key=0; 
  else                          /* key is pressed */ 
  { 
   if (extkey) 
    key=code+128; 
   else 
    key=code; 
  } 
  extkey=0; 
 } 
 else 
  if (code==0xE0) 
   extkey=1; 
} 
 
static int _getkey (char *s) 
{ 
 printf ("Press key for %s\n",s); 
 key=0; 
 while (!key); 
 _farpokew (_dos_ds,0x41A,_farpeekw(_dos_ds,0x41C));    /* clear buffer */ 
 return key; 
} 
 
int main (int argc,char *argv[]) 
{ 
 int left,right,up,down,firea,fireb,start,select; 
 _go32_dpmi_get_protected_mode_interrupt_vector (9,&oldirqkeyb); 
 newirqkeyb.pm_offset=(int)keyb_interrupt; 
 newirqkeyb.pm_selector=_go32_my_cs(); 
 _go32_dpmi_chain_protected_mode_interrupt_vector (9,&newirqkeyb); 
 left=_getkey ("LEFT"); 
 right=_getkey ("RIGHT"); 
 up=_getkey ("UP"); 
 down=_getkey ("DOWN"); 
 firea=_getkey ("BUTTON A"); 
 fireb=_getkey ("BUTTON B"); 
 start=_getkey ("START"); 
 select=_getkey ("SELECT"); 
 printf ("\n-keys %02X%02X%02X%02X%02X%02X%02X%02X\n", 
         left,right,up,down,firea,fireb,start,select); 
 _go32_dpmi_set_protected_mode_interrupt_vector (9,&oldirqkeyb); 
 return 0; 
}