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41 mv_fox 1 
/*
190 mateuszvis 2 
 * input keyboard routines used by the SvarDOS installer.
41 mv_fox 3 
 * Copyright (C) 2016 Mateusz Viste
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 */
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#ifndef input_h_sentinel
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#define input_h_sentinel
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#include <dos.h>
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#include "input.h" /* include self for control */
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/* waits for a keypress and return it. Returns 0x1xx for extended keys */
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int input_getkey(void) {
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  union REGS regs;
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  int res;
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  regs.h.ah = 0x08;
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  int86(0x21, &regs, &regs);
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  res = regs.h.al;
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  if (res == 0) { /* extended key - poll again */
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    regs.h.ah = 0x08;
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    int86(0x21, &regs, &regs);
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    res = regs.h.al | 0x100;
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  }
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  return(res);
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}
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/* poll the keyboard, and return the next input key in buffer, or -1 if none */
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int input_getkeyifany(void) {
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  union REGS regs;
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  regs.h.ah = 0x0B;
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  int86(0x21, &regs, &regs);
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  if (regs.h.al == 0xFF) return(input_getkey());
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  return(-1);
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}
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#endif