#include <stdio.h>
#include <dos.h>
#include <conio.h>
#define INTR 0x1C
#define KINTR 0x9

#ifdef __cplusplus
  #define __CPPARGS ...
#else
  #define __CPPARGS
#endif

void interrupt (*old)(__CPPARGS);

int time = 0;
int stop = 0;
char halt = 'f';

void interrupt control(__CPPARGS)
{
  if (!stop) ++time;
  old();
  return;
}

void kbd()
{
  char key, pressed = 0;
  asm{
    mov ah,01h
    int 16h
    jz OK
    mov key,al
    mov pressed,1
  }
  OK:;
  if (pressed)
  {
    stop = (key == 27);
    if (stop) printf("proces zastaven\n");
  }
}

void main(void)
{
  int last = -1;
  int state, laststop;
  old = getvect(INTR);
  setvect(INTR, control);
  do
  {
    kbd();
    if (time < 20) state = 1;
    else if (time < 30) state = 2;
    else if (time < 40) state = 3;
    else if (time < 50) state = 4;
    else if (time < 60) state = 5;
    else if (time < 90) state = 6;
    else state = 7;

    if (last != state)
    {
      switch (state){
	case 1: printf("napoustim vodu\n"); break;
	case 2: printf(">\n"); break;
	case 3: printf("<\n"); break;
	case 4: printf(">\n"); break;
	case 5: printf("<\n"); break;
	case 6: printf("vypoustim vodu\n"); break;
	case 7: printf("konec\n"); halt = 't'; break;
	}
    }
    last = state;
  }
  while((halt != 't'));
  setvect(INTR, old);
  getchar();
  return;
}