/*
 * irqvector.h -- MS-DOS interrupt vector subroutines
 *
 *	Copyright (C) 1997 by Sony Computer Entertainment
 *			All rights Reserved
 */
#include <stdio.h>
#include <stdlib.h>
#include <dos.h>
#include <conio.h>
#include <malloc.h>
#include "irqvect.h"

/*------- interrupt vector set/restore routines ------*/

struct intvects *ivects = NULL;

void restore_ivectors(void)
{
    struct intvects *v = ivects;
    for( v = ivects; v != NULL; v = v->next ) {
	_dos_setvect( v->vectnum, v->savevect );
    }
}

void set_ivector(unsigned short num, intvector vector)
{
    struct intvects *newvects = NULL;
    newvects = malloc(sizeof(struct intvects));
    if( newvects == NULL ) {
	_cputs("Can not malloc interrupt vector save area\n\r");
	restore_ivectors();
	exit(1);
    }
    newvects->vectnum = num;
    newvects->savevect = _dos_getvect(num);
    _dos_setvect(num, vector);

    newvects->next = ivects;
    ivects = newvects;
}

void printvect()
{
    void __far *vect;
    vect = (void __far *)_dos_getvect(0x1b);
    printf("\nint 1bh == %04x:%04x\n", _FP_SEG(vect), _FP_OFF(vect));
    vect = (void __far *)_dos_getvect(0x23);
    printf("int 23h == %04x:%04x\n", _FP_SEG(vect), _FP_OFF(vect));
    vect = (void __far *)_dos_getvect(0x24);
    printf("int 24h == %04x:%04x\n", _FP_SEG(vect), _FP_OFF(vect));
}