Subversion Repositories SvarDOS

/*

/*

 * input keyboard routines used by the Svarog386 installer.

 * input keyboard routines used by the Svarog386 installer.

 * Copyright (C) 2016 Mateusz Viste

 * Copyright (C) 2016 Mateusz Viste

 */

 */

#ifndef input_h_sentinel

#ifndef input_h_sentinel

#define input_h_sentinel

#define input_h_sentinel

#include <dos.h>

#include <dos.h>

#include "input.h" /* include self for control */

#include "input.h" /* include self for control */

/* waits for a keypress and return it. Returns 0x1xx for extended keys */

/* waits for a keypress and return it. Returns 0x1xx for extended keys */

int input_getkey(void) {

int input_getkey(void) {

  union REGS regs;

  union REGS regs;

  int res;

  int res;

  regs.h.ah = 0x08;

  regs.h.ah = 0x08;

  int86(0x21, &regs, &regs);

  int86(0x21, &regs, &regs);

  res = regs.h.al;

  res = regs.h.al;

  if (res == 0) { /* extended key - poll again */

  if (res == 0) { /* extended key - poll again */

    regs.h.ah = 0x08;

    regs.h.ah = 0x08;

    int86(0x21, &regs, &regs);

    int86(0x21, &regs, &regs);

    res = regs.h.al | 0x100;

    res = regs.h.al | 0x100;

  }

  }

  return(res);

  return(res);

}

}

/* poll the keyboard, and return the next input key in buffer, or -1 if none */

/* poll the keyboard, and return the next input key in buffer, or -1 if none */

int input_getkeyifany(void) {

int input_getkeyifany(void) {

  union REGS regs;

  union REGS regs;

  regs.h.ah = 0x0B;

  regs.h.ah = 0x0B;

  int86(0x21, &regs, &regs);

  int86(0x21, &regs, &regs);

  if (regs.h.al == 0xFF) return(input_getkey());

  if (regs.h.al == 0xFF) return(input_getkey());

  return(-1);

  return(-1);

}

}

#endif

#endif