Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpda!hpcupt1!hpisod2!decot
From: decot@hpisod2.cup.hp.com (Dave Decot)
Newsgroups: comp.unix.wizards
Subject: Re: sgtty -> termio
Message-ID: <14020112@hpisod2.cup.hp.com>
Date: 9 Apr 91 00:45:06 GMT
References: <2176@estevax.UUCP>
Organization: Hewlett Packard, Cupertino
Lines: 87


/* Routines for managing nonechoing, one-character-at-a-time tty reads */

/* Dave Decot, hpda!decot, 851023 */


#include <stdio.h>
#include <signal.h>
#include <sys/types.h>

#ifdef BSD
#   include <sgtty.h>
#else /* not BSD */
#   include <termio.h>
#endif

quit()
{
    signal(SIGQUIT, SIG_IGN);
    signal(SIGINT,  SIG_IGN);
    signal(SIGHUP,  SIG_IGN);
    signal(SIGTERM, SIG_IGN);

    normal();
    exit(0);
}


setup()
{
    signal(SIGQUIT, quit);
    signal(SIGHUP,  quit);
    signal(SIGTERM, quit);
    cbreak();
}



static int tty_mode = 0;

#ifdef TCGETA
    static struct termio orig_tty;
    static struct termio new_tty;
#else
    static struct sgttyb orig_tty;
    static struct sgttyb new_tty;
#endif


cbreak()
{
    if (tty_mode == 0)
    {
#ifdef TCGETA
	ioctl(0, TCGETA, &orig_tty);
#else
	ioctl(0, TIOCGETP, &orig_tty);
#endif
	tty_mode = 1;
	new_tty = orig_tty;
    }

#ifdef ICANON
    new_tty.c_lflag &= ~(ICANON | ECHO);
    new_tty.c_cc[VMIN] = 1;
    new_tty.c_cc[VTIME] = 0;
    ioctl(0, TCSETA, &new_tty);
#else
    new_tty.sg_flags |= CBREAK;
    new_tty.sg_flags &= ~ECHO;
    ioctl(0, TIOCSETN, &new_tty);
#endif
}


normal()
{
    if (tty_mode == 1)
    {
#ifdef TCSETA
	ioctl(0, TCSETA, &orig_tty);
#else
	ioctl(0, TIOCSETN, &orig_tty);
#endif
	new_tty = orig_tty;
    }
}