#include <stdio.h>
#include <dos.h>

volatile int clock_ticks;
void (__interrupt __far *prev_int_1c)();
#define BLIP_COUNT  (5*18)  /* 5 seconds */

void __interrupt __far timer_rtn()
  {
    ++clock_ticks;
    _chain_intr( prev_int_1c );
  }

int delays = 0;

void main()
  {
    prev_int_1c = _dos_getvect( 0x1c );
    _dos_setvect( 0x1c, timer_rtn );
    while( compile_a_line() ) {
	if( clock_ticks >= BLIP_COUNT ) {
	    putchar( '.' );
	    clock_ticks -= BLIP_COUNT;
	}
    }
    _dos_setvect( 0x1c, prev_int_1c );
  }

int compile_a_line()
  {
    if( delays > 15 ) return( 0 );
    delay( 1000 );  /* delay for 1 second */
    printf( "Delayed for 1 second\n" );
    delays++;
    return( 1 );
  }
