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01755d36e7
Update to latest gnulib with new copyright year. Run "make update-copyright" and then... * tests/init.sh: Sync with gnulib to pick up copyright year. * bootstrap: Manually update copyright year, until we fully sync with gnulib at a later stage. * tests/sample-test: Adjust to use the single most recent year.
134 lines
3.1 KiB
C
134 lines
3.1 KiB
C
/* tty -- print the name of the terminal connected to standard input
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Copyright (C) 1990-2023 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 3 of the License, or
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(at your option) 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, see <https://www.gnu.org/licenses/>. */
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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 a tty, 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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#include "quote.h"
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/* Exit statuses. */
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enum
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{
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TTY_STDIN_NOTTY = 1,
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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 proper_name ("David MacKenzie")
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/* If true, return an exit status but produce no output. */
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static bool 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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emit_try_help ();
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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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emit_ancillary_info (PROGRAM_NAME);
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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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int optc;
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initialize_main (&argc, &argv);
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set_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 = false;
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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 's':
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silent = true;
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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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{
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error (0, 0, _("extra operand %s"), quote (argv[optind]));
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usage (TTY_FAILURE);
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}
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errno = ENOENT;
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if (silent)
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return isatty (STDIN_FILENO) ? EXIT_SUCCESS : TTY_STDIN_NOTTY;
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int status = EXIT_SUCCESS;
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char const *tty = ttyname (STDIN_FILENO);
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if (! tty)
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{
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tty = _("not a tty");
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status = TTY_STDIN_NOTTY;
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}
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puts (tty);
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return status;
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}
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