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/* whoami -- print effective userid
Copyright (C) 89,90, 1991-1997, 1999-2002 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 "long-options.h"
#include "closeout.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;
static struct option const long_options[] =
{
{0, 0, 0, 0}
};
void
usage (int status)
{
if (status != 0)
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)
{
register struct passwd *pw;
register uid_t uid;
int c;
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,
AUTHORS, usage);
while ((c = getopt_long (argc, argv, "", long_options, NULL)) != -1)
{
switch (c)
{
case 0:
break;
default:
usage (EXIT_FAILURE);
}
}
if (optind != argc)
usage (EXIT_FAILURE);
uid = geteuid ();
pw = getpwuid (uid);
if (pw)
{
puts (pw->pw_name);
exit (EXIT_SUCCESS);
}
fprintf (stderr, _("%s: cannot find username for UID %u\n"),
program_name, (unsigned) uid);
exit (EXIT_FAILURE);
}
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