usr/src/usr.bin/more/ttyin.c

/*
 * Copyright (c) 1988 Mark Nudleman
 * Copyright (c) 1988, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)ttyin.c     8.1 (Berkeley) %G%";
#endif /* not lint */

/*
 * Routines dealing with getting input from the keyboard (i.e. from the user).
 */

#include <less.h>

static int tty;

/*
 * Open keyboard for input.
 * (Just use file descriptor 2.)
 */
open_getchr()
{
        tty = 2;
}

/*
 * Get a character from the keyboard.
 */
getchr()
{
        char c;
        int result;

        do
        {
                result = iread(tty, &c, 1);
                if (result == READ_INTR)
                        return (READ_INTR);
                if (result < 0)
                {
                        /*
                         * Don't call error() here,
                         * because error calls getchr!
                         */
                        quit();
                }
        } while (result != 1);
        return (c & 0177);
}