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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libcmd/tty.c
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1992-2012 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * David Korn

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 * AT&T Bell Laboratories

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 *

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 * tty

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 */

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static const char usage[] =

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"[-?\n@(#)$Id: tty (AT&T Research) 2008-03-13 $\n]"

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USAGE_LICENSE

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"[+NAME?tty - write the name of the terminal to standard output]"

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"[+DESCRIPTION?\btty\b writes the name of the terminal that is connected "

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	"to standard input onto standard output.  If the standard input is not "

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	"a terminal, \"\bnot a tty\b\" will be written to standard output.]"

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"[l:line-number?Write the synchronous line number of the terminal on a "

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	"separate line following the terminal name line. If the standard "

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	"input is not a synchronous  terminal then "

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	"\"\bnot on an active synchronous line\b\" is written.]"

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"[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]"

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"[+EXIT STATUS?]{"

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        "[+0?Standard input is a tty.]"

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        "[+1?Standard input is not a tty.]"

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        "[+2?Invalid arguments.]"

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        "[+3?A an error occurred.]"

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"}"

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;

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#include <cmd.h>

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#if _mac_STWLINE

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#include <sys/stermio.h>

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#endif

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int

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b_tty(int argc, char** argv, Shbltin_t* context)

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{

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	register int	sflag = 0;

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	register int	lflag = 0;

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	register char*	tty;

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#if _mac_STWLINE

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	int		n;

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#endif

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	cmdinit(argc, argv, context, ERROR_CATALOG, 0);

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	for (;;)

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	{

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		switch (optget(argv, usage))

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		{

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		case 'l':

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			lflag++;

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			continue;

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		case 's':

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			sflag++;

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			continue;

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		case ':':

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			error(2, "%s", opt_info.arg);

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			break;

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		case '?':

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			error(ERROR_usage(2), "%s", opt_info.arg);

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			break;

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		}

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		break;

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	}

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	if(error_info.errors)

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		error(ERROR_usage(2), "%s", optusage(NiL));

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	if(!(tty=ttyname(0)))

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	{

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		tty = ERROR_translate(0, 0, 0, "not a tty");

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		error_info.errors++;

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	}

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	if(!sflag)

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		sfputr(sfstdout,tty,'\n');

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	if(lflag)

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	{

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#if _mac_STWLINE

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		if ((n = ioctl(0, STWLINE, 0)) >= 0)

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			error(ERROR_OUTPUT, 1, "synchronous line %d", n);

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		else

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#endif

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			error(ERROR_OUTPUT, 1, "not on an active synchronous line");

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	}

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	return(error_info.errors);

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}

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