/*
Copyright (C) Magna Carta Software, Inc. 1990, 1991.  All Rights Reserved
C COMMUNICATIONS TOOLKIT
COMMIO.C -- Basic serial I/O functions (no data translation)
*/


#include <ccttype.h>


/*
C_INCHAR -- See if a byte has been received at the designated serial port.
If so return it.  This function does not wait for a character to arrive.
Return: the byte read, or -1 if no byte is ready.
*/
short c_inchar(COMM_PORT *p)
{
    if ((*p->rxstat)(p))
        return ((*p->c_read)(p));
    return (-1);
}