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f915f22d85
(main): Use initialize_exit_failure rather than setting exit_failure directly; this optimizes away redundant assignments. (TTY_FAILURE, TTY_WRITE_ERROR): New enum values; substitute them for the corresponding integer constants.
132 lines
3.1 KiB
C
132 lines
3.1 KiB
C
/* tty -- print the path of the terminal connected to standard input
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Copyright (C) 1990-2004 Free Software Foundation, Inc.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software Foundation,
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Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* Displays "not a tty" if stdin is not a terminal.
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Displays nothing if -s option is given.
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Exit status 0 if stdin is a tty, 1 if not, 2 if usage error,
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3 if write error.
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Written by David MacKenzie <djm@gnu.ai.mit.edu>. */
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#include <config.h>
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#include <stdio.h>
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#include <getopt.h>
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#include <sys/types.h>
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#include "system.h"
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#include "error.h"
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/* Exit statuses. */
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enum
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{
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TTY_FAILURE = 2,
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TTY_WRITE_ERROR = 3
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};
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/* The official name of this program (e.g., no `g' prefix). */
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#define PROGRAM_NAME "tty"
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#define AUTHORS "David MacKenzie"
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/* The name under which this program was run. */
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char *program_name;
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/* If nonzero, return an exit status but produce no output. */
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static int silent;
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static struct option const longopts[] =
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{
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{"silent", no_argument, NULL, 's'},
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{"quiet", no_argument, NULL, 's'},
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{GETOPT_HELP_OPTION_DECL},
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{GETOPT_VERSION_OPTION_DECL},
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{NULL, 0, NULL, 0}
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};
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void
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usage (int status)
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{
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if (status != EXIT_SUCCESS)
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fprintf (stderr, _("Try `%s --help' for more information.\n"),
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program_name);
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else
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{
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printf (_("Usage: %s [OPTION]...\n"), program_name);
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fputs (_("\
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Print the file name of the terminal connected to standard input.\n\
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\n\
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-s, --silent, --quiet print nothing, only return an exit status\n\
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"), stdout);
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fputs (HELP_OPTION_DESCRIPTION, stdout);
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fputs (VERSION_OPTION_DESCRIPTION, stdout);
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printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
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}
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exit (status);
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}
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int
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main (int argc, char **argv)
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{
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char *tty;
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int optc;
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initialize_main (&argc, &argv);
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program_name = argv[0];
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setlocale (LC_ALL, "");
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bindtextdomain (PACKAGE, LOCALEDIR);
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textdomain (PACKAGE);
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initialize_exit_failure (TTY_WRITE_ERROR);
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atexit (close_stdout);
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silent = 0;
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while ((optc = getopt_long (argc, argv, "s", longopts, NULL)) != -1)
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{
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switch (optc)
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{
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case 0:
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break;
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case 's':
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silent = 1;
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break;
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case_GETOPT_HELP_CHAR;
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case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
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default:
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usage (TTY_FAILURE);
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}
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}
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if (optind < argc)
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error (0, 0, _("ignoring all arguments"));
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tty = ttyname (0);
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if (!silent)
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{
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if (tty)
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puts (tty);
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else
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puts (_("not a tty"));
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}
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exit (isatty (0) ? EXIT_SUCCESS : EXIT_FAIL);
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}
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