coreutils-6.9coreutils-6.9

1 files changed, 129 insertions, 0 deletions

diff --git a/src/tty.c b/src/tty.c
new file mode 100644
index 0000000..5228e7a
--- /dev/null
+++ b/src/tty.c
@@ -0,0 +1,129 @@
+/* tty -- print the name of the terminal connected to standard input
+   Copyright (C) 1990-2005 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Displays "not a tty" if stdin is not a terminal.
+   Displays nothing if -s option is given.
+   Exit status 0 if stdin is a tty, 1 if not, 2 if usage error,
+   3 if write error.
+
+   Written by David MacKenzie <djm@gnu.ai.mit.edu>.  */
+
+#include <config.h>
+#include <stdio.h>
+#include <getopt.h>
+#include <sys/types.h>
+
+#include "system.h"
+#include "error.h"
+#include "quote.h"
+
+/* Exit statuses.  */
+enum
+  {
+    TTY_FAILURE = 2,
+    TTY_WRITE_ERROR = 3
+  };
+
+/* The official name of this program (e.g., no `g' prefix).  */
+#define PROGRAM_NAME "tty"
+
+#define AUTHORS "David MacKenzie"
+
+/* The name under which this program was run. */
+char *program_name;
+
+/* If true, return an exit status but produce no output. */
+static bool silent;
+
+static struct option const longopts[] =
+{
+  {"silent", no_argument, NULL, 's'},
+  {"quiet", no_argument, NULL, 's'},
+  {GETOPT_HELP_OPTION_DECL},
+  {GETOPT_VERSION_OPTION_DECL},
+  {NULL, 0, NULL, 0}
+};
+
+void
+usage (int status)
+{
+  if (status != EXIT_SUCCESS)
+    fprintf (stderr, _("Try `%s --help' for more information.\n"),
+	     program_name);
+  else
+    {
+      printf (_("Usage: %s [OPTION]...\n"), program_name);
+      fputs (_("\
+Print the file name of the terminal connected to standard input.\n\
+\n\
+  -s, --silent, --quiet   print nothing, only return an exit status\n\
+"), stdout);
+      fputs (HELP_OPTION_DESCRIPTION, stdout);
+      fputs (VERSION_OPTION_DESCRIPTION, stdout);
+      printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+    }
+  exit (status);
+}
+
+int
+main (int argc, char **argv)
+{
+  char *tty;
+  int optc;
+
+  initialize_main (&argc, &argv);
+  program_name = argv[0];
+  setlocale (LC_ALL, "");
+  bindtextdomain (PACKAGE, LOCALEDIR);
+  textdomain (PACKAGE);
+
+  initialize_exit_failure (TTY_WRITE_ERROR);
+  atexit (close_stdout);
+
+  silent = false;
+
+  while ((optc = getopt_long (argc, argv, "s", longopts, NULL)) != -1)
+    {
+      switch (optc)
+	{
+	case 's':
+	  silent = true;
+	  break;
+
+	case_GETOPT_HELP_CHAR;
+
+	case_GETOPT_VERSION_CHAR (PROGRAM_NAME, AUTHORS);
+
+	default:
+	  usage (TTY_FAILURE);
+	}
+    }
+
+  if (optind < argc)
+    error (0, 0, _("extra operand %s"), quote (argv[optind]));
+
+  tty = ttyname (STDIN_FILENO);
+  if (!silent)
+    {
+      if (tty)
+	puts (tty);
+      else
+	puts (_("not a tty"));
+    }
+
+  exit (isatty (STDIN_FILENO) ? EXIT_SUCCESS : EXIT_FAIL);
+}