ttimeout.c

操作系统SunOS 4.1.3版本的源码

/*	Copyright (c) 1984 AT&T	*/
/*	  All Rights Reserved  	*/

/*	THIS IS UNPUBLISHED PROPRIETARY SOURCE CODE OF AT&T	*/
/*	The copyright notice above does not evidence any   	*/
/*	actual or intended publication of such source code.	*/

#ifndef lint
static	char sccsid[] = "@(#)ttimeout.c 1.1 92/07/30 SMI"; /* from S5R3.1 1.2 */
#endif

#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
 */

void	_setblock(), _settimeout();

ttimeout(delay)
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;
    wtimeout(stdscr, delay);	/* assume same as std. screen */
good:
    return (OK);
}

#ifdef	SYSV
/* set the terminal to nodelay (==0) or block(<0) */
static	void
_setblock(block)
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(num)
int	num;
{
    PROGTTY.c_lflag &= ~ICANON;
    if (num > 0)
    {
	PROGTTY.c_cc[VMIN] = 0;
	PROGTTY.c_cc[VTIME] = (num > 25500) ? 255 : (num + 99) / 100;
	cur_term->_fl_rawmode = 3;
    }
    else
    {
	PROGTTY.c_cc[VMIN] = 1;
	PROGTTY.c_cc[VTIME] = 0;
	cur_term->_fl_rawmode = 1;
    }
    reset_prog_mode();
}
#endif	/* SYSV */