global: convert indentation-TABs to spaces
[coreutils.git] / src / whoami.c
blob928f69e455e92d7733616e5156a237156fd1919f
1 /* whoami -- print effective userid
3 Copyright (C) 89,90, 1991-1997, 1999-2002, 2004, 2005,
4 2007-2009 Free Software Foundation, Inc.
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>. */
19 /* Equivalent to `id -un'. */
20 /* Written by Richard Mlynarik. */
22 #include <config.h>
23 #include <stdio.h>
24 #include <sys/types.h>
25 #include <pwd.h>
26 #include <getopt.h>
28 #include "system.h"
29 #include "error.h"
30 #include "long-options.h"
31 #include "quote.h"
33 /* The official name of this program (e.g., no `g' prefix). */
34 #define PROGRAM_NAME "whoami"
36 #define AUTHORS proper_name ("Richard Mlynarik")
38 void
39 usage (int status)
41 if (status != EXIT_SUCCESS)
42 fprintf (stderr, _("Try `%s --help' for more information.\n"),
43 program_name);
44 else
46 printf (_("Usage: %s [OPTION]...\n"), program_name);
47 fputs (_("\
48 Print the user name associated with the current effective user ID.\n\
49 Same as id -un.\n\
50 \n\
51 "), stdout);
52 fputs (HELP_OPTION_DESCRIPTION, stdout);
53 fputs (VERSION_OPTION_DESCRIPTION, stdout);
54 emit_bug_reporting_address ();
56 exit (status);
59 int
60 main (int argc, char **argv)
62 struct passwd *pw;
63 uid_t uid;
65 initialize_main (&argc, &argv);
66 set_program_name (argv[0]);
67 setlocale (LC_ALL, "");
68 bindtextdomain (PACKAGE, LOCALEDIR);
69 textdomain (PACKAGE);
71 atexit (close_stdout);
73 parse_long_options (argc, argv, PROGRAM_NAME, PACKAGE_NAME, Version,
74 usage, AUTHORS, (char const *) NULL);
75 if (getopt_long (argc, argv, "", NULL, NULL) != -1)
76 usage (EXIT_FAILURE);
78 if (optind != argc)
80 error (0, 0, _("extra operand %s"), quote (argv[optind]));
81 usage (EXIT_FAILURE);
84 uid = geteuid ();
85 pw = getpwuid (uid);
86 if (pw)
88 puts (pw->pw_name);
89 exit (EXIT_SUCCESS);
91 fprintf (stderr, _("%s: cannot find name for user ID %lu\n"),
92 program_name, (unsigned long int) uid);
93 exit (EXIT_FAILURE);