libcurses/screen/ttimeout.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1988 AT&T */
/*    All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

/*LINTLIBRARY*/

#include    <sys/types.h>
#include    "curses_inc.h"
#include    <fcntl.h>

/*
 * Set the current time-out period for getting input.
 *
 * delay:   < 0 for infinite delay (blocking read)
 *      = 0 for no delay read
 *      > 0 to specify a period in millisecs to wait
 *      for input, then return '\0' if none comes
 */

static void _setblock(int), _settimeout(int);

int
ttimeout(int delay)
{
    if (cur_term->_inputfd < 0)
        return (ERR);

    if (delay < 0)
        delay = -1;

    if (cur_term->_delay == delay)
        goto good;

#ifdef  SYSV
    if (delay > 0) {
        if (cur_term->_delay < 0)
            _setblock(-delay);
        _settimeout(delay);
    } else
        if ((delay + cur_term->_delay) == -1)
            _setblock(delay);
        else {
            if (delay < 0)
                _setblock(delay);
            _settimeout(delay);
        }
#else   /* SYSV */
    cbreak();
#endif  /* SYSV */

    cur_term->_delay = delay;
good:
    return (OK);
}

#ifdef  SYSV
/* set the terminal to nodelay (==0) or block(<0) */
static  void
_setblock(int block)
{
    int flags = fcntl(cur_term->_inputfd, F_GETFL, 0);

    if (block < 0)
        flags &= ~O_NDELAY;
    else
        flags |= O_NDELAY;

    (void) fcntl(cur_term->_inputfd, F_SETFL, flags);
}

/*
 * set the terminal to timeout in t milliseconds,
 * rounded up to the nearest 10th of a second.
 */
static  void
_settimeout(int num)
{
    PROGTTYS.c_lflag &= ~ICANON;
    if (num > 0) {
        PROGTTYS.c_cc[VMIN] = 0;
        PROGTTYS.c_cc[VTIME] = (num > 25500) ? 255 : (num + 99) / 100;
        cur_term->_fl_rawmode = 3;
    } else {
        PROGTTYS.c_cc[VMIN] = 1;
        PROGTTYS.c_cc[VTIME] = 0;
        cur_term->_fl_rawmode = 1;
    }
    (void) reset_prog_mode();
}
#endif  /* SYSV */