/* tsort - topological sort.
- Copyright (C) 1998-2005 Free Software Foundation, Inc.
+ Copyright (C) 1998-2005, 2007-2008 Free Software Foundation, Inc.
- This program is free software; you can redistribute it and/or modify
+ 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.
+ the Free Software Foundation, either version 3 of the License, 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
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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Mark Kettenis <kettenis@phys.uva.nl>. */
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "tsort"
-#define AUTHORS "Mark Kettenis"
+#define AUTHORS proper_name ("Mark Kettenis")
/* Token delimiters when reading from a file. */
#define DELIM " \t\n"
struct successor *top;
};
-/* The name this program was run with. */
-char *program_name;
-
-/* True if any of the input files are the standard input. */
-static bool have_read_stdin;
-
/* The head of the sorted list. */
static struct item *head = NULL;
"), program_name);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
- printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
+ emit_bug_reporting_address ();
}
exit (status);
struct item *root;
struct item *j = NULL;
struct item *k = NULL;
- FILE *fp;
token_buffer tokenbuffer;
+ bool is_stdin = STREQ (file, "-");
/* Intialize the head of the tree will hold the strings we're sorting. */
root = new_item (NULL);
- if (STREQ (file, "-"))
- {
- fp = stdin;
- have_read_stdin = true;
- }
- else
- {
- fp = fopen (file, "r");
- if (fp == NULL)
- error (EXIT_FAILURE, errno, "%s", file);
- }
+ if (!is_stdin && ! freopen (file, "r", stdin))
+ error (EXIT_FAILURE, errno, "%s", file);
init_tokenbuffer (&tokenbuffer);
while (1)
{
/* T2. Next Relation. */
- size_t len = readtoken (fp, DELIM, sizeof (DELIM) - 1, &tokenbuffer);
+ size_t len = readtoken (stdin, DELIM, sizeof (DELIM) - 1, &tokenbuffer);
if (len == (size_t) -1)
break;
struct successor *p = head->top;
/* T5. Output front of queue. */
- printf ("%s\n", head->str);
+ puts (head->str);
head->str = NULL; /* Avoid printing the same string twice. */
n_strings--;
}
}
+ if (fclose (stdin) != 0)
+ error (EXIT_FAILURE, errno, "%s",
+ is_stdin ? _("standard input") : quote (file));
+
return ok;
}
bool ok;
initialize_main (&argc, &argv);
- program_name = argv[0];
+ set_program_name (argv[0]);
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
if (getopt_long (argc, argv, "", NULL, NULL) != -1)
usage (EXIT_FAILURE);
- have_read_stdin = false;
-
if (1 < argc - optind)
{
error (0, 0, _("extra operand %s"), quote (argv[optind + 1]));
ok = tsort (optind == argc ? "-" : argv[optind]);
- if (have_read_stdin && fclose (stdin) == EOF)
- error (EXIT_FAILURE, errno, _("standard input"));
-
exit (ok ? EXIT_SUCCESS : EXIT_FAILURE);
}