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From: toma@killer.UUCP (Tom Armistead)
Newsgroups: comp.lang.c
Subject: Re: HELP!!
Message-ID: <2015@killer.UUCP>
Date: Sat, 7-Nov-87 00:25:47 EST
Article-I.D.: killer.2015
Posted: Sat Nov  7 00:25:47 1987
Date-Received: Wed, 11-Nov-87 04:04:41 EST
References: <10202@brl-adm.ARPA>
Organization: The Org. for the Disorg. of Org.
Lines: 91
Summary: How to do single character I/O from stdin/stdout

In article <10202@brl-adm.ARPA>, jl3j+@andrew.cmu.EDU (John Robert Leavitt) writes:
.
.
.
> 	The situation is this.  We need a way of getting one character from
> stdin without having to hit return.  That's it.  (For the CMU folks getting
> this, we are using Andrew and RT workstations.  I think you guys are the ones
> who will be most able to help.)  However, we cannot find a way top do this.
> ANY suggestions would be appreciated.
.
.
.

real quick and dirty, this will do it for you under System V and maybe 
others...


---------
main()
{   char  ch;
    system("stty raw -echo");    /* your system may require '-cooked' */
                                 /* instead of 'raw'                  */

    /*
    ** now all io to terminal will be 'raw', i.e. single character i/o
    ** getchar() will work just fine...
    */

    system("stty -raw echo");    /* again, you may need 'cooked' instead */
                                 /* of '-raw'                            */
}
--------

This could be done more elegently by a call to gtty() and stty() or
ioctl()

like this...
--------
#include <sgtty.h>

main()
{
	struct	sgttyb	argp,argsav;
	int	ch;

	/*
	**	get current terminal characteristics
	**	for stdin
	*/
	gtty(0,&argp);

	/*
	**	save current setup
	*/
	memcpy(&argsav,&argp,sizeof(struct sgttyb));

	/*
	**	set flags to turn off echo and
	**	character buffering (binary mode)
	*/
	argp.sg_flags |= RAW;		/* no buffering */
	argp.sg_flags &= ~ECHO;		/* and turn off echo */

	/*
	**	now set the terminal as sepcified
	**	by those flags
	*/
	stty(0,&argp);

	/*
	**	now standard character reads will work
	**	without any buffering
	*/
	while ((ch = getchar()) != 'q')
		printf("->%c<-",ch);

	/*
	**	reset back to original terminal charactistics
	*/
	stty(0,&argsav);

}
----------
maybe this will help???

Tom
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-- 
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Tom Armistead
UUCP:  ...!ihnp4!killer!toma