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Diffstat (limited to 'src/whoami.c')
-rw-r--r-- | src/whoami.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/whoami.c b/src/whoami.c new file mode 100644 index 0000000..c4a2b5e --- /dev/null +++ b/src/whoami.c @@ -0,0 +1,98 @@ +/* whoami -- print effective userid + + Copyright (C) 89,90, 1991-1997, 1999-2002, 2004, 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. */ + +/* Equivalent to `id -un'. */ +/* Written by Richard Mlynarik. */ + +#include <config.h> +#include <stdio.h> +#include <sys/types.h> +#include <pwd.h> +#include <getopt.h> + +#include "system.h" +#include "error.h" +#include "long-options.h" +#include "quote.h" + +/* The official name of this program (e.g., no `g' prefix). */ +#define PROGRAM_NAME "whoami" + +#define AUTHORS "Richard Mlynarik" + +/* The name this program was run with. */ +char *program_name; + +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 user name associated with the current effective user ID.\n\ +Same as id -un.\n\ +\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) +{ + struct passwd *pw; + uid_t uid; + + initialize_main (&argc, &argv); + program_name = argv[0]; + setlocale (LC_ALL, ""); + bindtextdomain (PACKAGE, LOCALEDIR); + textdomain (PACKAGE); + + atexit (close_stdout); + + parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION, + usage, AUTHORS, (char const *) NULL); + if (getopt_long (argc, argv, "", NULL, NULL) != -1) + usage (EXIT_FAILURE); + + if (optind != argc) + { + error (0, 0, _("extra operand %s"), quote (argv[optind])); + usage (EXIT_FAILURE); + } + + uid = geteuid (); + pw = getpwuid (uid); + if (pw) + { + puts (pw->pw_name); + exit (EXIT_SUCCESS); + } + fprintf (stderr, _("%s: cannot find name for user ID %lu\n"), + program_name, (unsigned long int) uid); + exit (EXIT_FAILURE); +} |