/*
Copyright (C) Magna Carta Software, Inc. 1990, 1991.  All Rights Reserved.
C COMMUNICATIONS TOOLKIT v1.0
CCTUTIL.C -- Utility Functions for CCT.
*/

#define CCT_DEVELOPMENT
#include <dos.h>
#include <compat.h>
#if defined(MSC)
    #include <conio.h>
#endif
#include <stdio.h>
#include <stdlib.h>


#if !defined(TYPES_DEFINED)
    typedef unsigned char   BYTE;
    typedef unsigned short  WORD;
    typedef unsigned long   DWORD;
    #define TYPES_DEFINED
#endif


#define LOW_TIME            0X46C

#if 0
void (INTERRUPT_ *old_isr_1B)() = (void (INTERRUPT_ *)()) NULL; /* saved CTRL-BREAK vector */
void (INTERRUPT_ *old_isr_23)() = (void (INTERRUPT_ *)()) NULL; /* saved CTRL-C vector */
#endif
void (FAR_ *old_isr_1B)() = (void (FAR_ *)()) NULL; /* saved CTRL-BREAK vector */
void (FAR_ *old_isr_23)() = (void (FAR_ *)()) NULL; /* saved CTRL-C vector */


#if (!defined(DOSX286) && !defined(DOSX386) && !defined(CCTW))
/*
INSTALL_CTRL_BRK_ -- Install CTRL-BREAK and CTRL-C handlers.
Return code:
    n (0-2) -- number of handlers installed;
*/

short install_ctrl_brk_(void (FAR_ *fn)())
{
    short ret = 0;
    /* INSTALL CTRL-BREAK AND CTRL-C HANDLERS */
    if (old_isr_1B == NULL) {
        old_isr_1B = (void (FAR_ *)()) get_vector(0X1B);
        set_vector(0X1B, fn);
        ret++;

    }
    if (old_isr_23 == NULL) {
        old_isr_23 = (void (FAR_ *)()) get_vector(0X23);
        set_vector(0X23, fn);
        ret++;
    }
    return (ret);
}



/*
DEINSTALL_CTRL_BRK_ -- Deinstall CTRL-BREAK and CTRL-C handlers.
Return code:
    n (0-2) -- number of handlers installed;
*/
short deinstall_ctrl_brk_(void (FAR_ *fn)())
{
    short ret = 0;

    if ((void (FAR_ *)()) get_vector(0X1B) == fn) set_vector(0X1B, old_isr_1B);
    if ((void (FAR_ *)()) get_vector(0X23) == fn) set_vector(0X23, old_isr_23);

    return (ret);
}



#if !defined(_INTELC32_)
/*
CCT_CTRL_BRK_ -- Interrupt handler for CTRL-BRK and CONTROL-C.  Just iret.
*/
void INTERRUPT_ cct_ctrl_brk_(void)
{
    ;
}
#endif
#endif