/***                 LISTING 7                ***/
/***                                          ***/
/***                 assert.c                 ***/
/*** **************************************** ***/
/***    MODEM CONTROL AND STATUS ROUTINES     ***/
/*** **************************************** ***/
#include "serial.h"

extern int portbase;

/*** **************************************** ***/
/***      USE TO SET CONTROL BITS IN MCR      ***/
/*** **************************************** ***/
void Assert(int request)
{
 int Current_Value;

 Current_Value = inp(portbase + MCR);

 outp(portbase + MCR,(Current_Value | request));
}

/*** **************************************** ***/
/***   USE TO TURN OFF CONTROL BITS IN MCR    ***/
/*** **************************************** ***/
void Assert_Off(int request)
{
 int Current_Value;

 Current_Value = inp(portbase + MCR);

 outp(portbase + MCR,(Current_Value & (0xFF - request)));
}

/*** **************************************** ***/
/***    GIVES STATUS OF CONTROL BIT IN MSR    ***/
/*** **************************************** ***/
int Status(int request)
{
 int Current_Value;

 Current_Value = (inp(portbase + MSR) & request);

 return(Current_Value);
}