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/*
** Originally published as part of the MicroFirm Function Library
**
** Copyright 1990, Robert B.Stout
**
** Subset version released to the public domain, 1992
**
** Function to locate an unused user interrupt vector.
*/
#ifdef __ZTC__
#include <int.h>
#else
#include <dos.h>
#ifdef __TURBOC__
#define GETVECT getvect
#define FAR far
#define INTERRUPT interrupt
#else /* assume MSC */
#define GETVECT _dos_getvect
#define FAR _far
#define INTERRUPT _interrupt
#endif
#define FNULL (void (FAR *)())(0L)
#endif
unsigned findIslot(void)
{
#ifdef __ZTC__
unsigned int_no, seg, ofs;
for (int_no = 0x60; int_no < 0x6f; ++int_no)
{
int_getvector(int_no, &seg, &ofs);
if (0U == (seg | ofs))
return int_no;
}
#else /* MSC/BC/TC */
unsigned int_no;
for (int_no = 0x60; int_no < 0x6f; ++int_no)
{
if (FNULL != (void (FAR *)())GETVECT(int_no))
return int_no;
}
#endif
return 0;
}
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