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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1992-2012 AT&T Intellectual Property *
* and is licensed under the *
* Eclipse Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* A copy of the License is available at *
* http://www.eclipse.org/org/documents/epl-v10.html *
* (with md5 checksum b35adb5213ca9657e911e9befb180842) *
* *
* Information and Software Systems Research *
* AT&T Research *
* Florham Park NJ *
* *
* Glenn Fowler <gsf@research.att.com> *
* David Korn <dgk@research.att.com> *
* *
***********************************************************************/
#pragma prototyped
/*
* David Korn
* AT&T Bell Laboratories
*
* tty
*/
static const char usage[] =
"[-?\n@(#)$Id: tty (AT&T Research) 2008-03-13 $\n]"
USAGE_LICENSE
"[+NAME?tty - write the name of the terminal to standard output]"
"[+DESCRIPTION?\btty\b writes the name of the terminal that is connected "
"to standard input onto standard output. If the standard input is not "
"a terminal, \"\bnot a tty\b\" will be written to standard output.]"
"[l:line-number?Write the synchronous line number of the terminal on a "
"separate line following the terminal name line. If the standard "
"input is not a synchronous terminal then "
"\"\bnot on an active synchronous line\b\" is written.]"
"[s:silent|quiet?Disable the terminal name line. Use \b[[ -t 0 ]]]]\b instead.]"
"[+EXIT STATUS?]{"
"[+0?Standard input is a tty.]"
"[+1?Standard input is not a tty.]"
"[+2?Invalid arguments.]"
"[+3?A an error occurred.]"
"}"
;
#include <cmd.h>
#if _mac_STWLINE
#include <sys/stermio.h>
#endif
int
b_tty(int argc, char** argv, Shbltin_t* context)
{
register int sflag = 0;
register int lflag = 0;
register char* tty;
#if _mac_STWLINE
int n;
#endif
cmdinit(argc, argv, context, ERROR_CATALOG, 0);
for (;;)
{
switch (optget(argv, usage))
{
case 'l':
lflag++;
continue;
case 's':
sflag++;
continue;
case ':':
error(2, "%s", opt_info.arg);
break;
case '?':
error(ERROR_usage(2), "%s", opt_info.arg);
break;
}
break;
}
if(error_info.errors)
error(ERROR_usage(2), "%s", optusage(NiL));
if(!(tty=ttyname(0)))
{
tty = ERROR_translate(0, 0, 0, "not a tty");
error_info.errors++;
}
if(!sflag)
sfputr(sfstdout,tty,'\n');
if(lflag)
{
#if _mac_STWLINE
if ((n = ioctl(0, STWLINE, 0)) >= 0)
error(ERROR_OUTPUT, 1, "synchronous line %d", n);
else
#endif
error(ERROR_OUTPUT, 1, "not on an active synchronous line");
}
return(error_info.errors);
}
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