#include <dos.h>
#include "bioskeye.h"

int bioskeye(function)
int function;
{

   static union REGS rg;                          /* define registers */
   int rc;                                      /* define return code */

   switch (function) {             /* check which function asking for */
      /* --------------------------------function 0: return key value */
      case 0:
         rg.h.ah = 0x10;                    /* interrupt function 10h */
         int86(0x16, &rg, &rg);                 /* call interrupt 16h */
         rc = rg.x.ax;             /* 'AH'=Scan Code, 'AL'=ASCII code */
         break;                                     /* get outta here */
      /* ------------------function 1: report key stroke availability */
      case 1:
         rg.h.ah = 0x11;                    /* interrupt function 11h */
         int86(0x16, &rg, &rg);                 /* call interrupt 16h */
         if (rg.x.flags & 0x40)                   /* check status bit */
            rc = 0;               /* bit set, report no key available */
         else
            rc = rg.x.ax;          /* bit clear, report key available */
         break;                                     /* get outta here */
      /* -----------------------------function 1: report shift status */
      case 2:
         rg.h.ah = 0x12;                    /* interrupt function 12h */
         int86(0x16, &rg, &rg);                 /* call interrupt 16h */
         rc = rg.x.ax;                           /* 'AX'=Shift Status */
         break;                                     /* get outta here */
      /* --------------------------what function ???, return 0 anyway */
      default:
         rc = 0;
         break;                                     /* get outta here */
   }
   return rc;                                    /* all done, bye bye */
}