/*

  Find out login name for vlock, the VT locking program for linux.

  Copyright (C) 2002 Dmitry V. Levin <ldv@altlinux.org>

  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 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

  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

*/

#include "config.h"

#include <stdio.h>

#include <errno.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include <pwd.h>

#include "vlock.h"

#include "nls.h"

#include "kbd_error.h"

/*

 * Try to find out proper login name.

 */

const char *

get_username(void)

{

	const char *name;

	struct passwd *pw = 0;

	uid_t uid         = getuid();

	char *logname = getenv("LOGNAME");

	if (logname) {

		pw = getpwnam(logname);

		/* Ensure uid is same as current. */

		if (pw && pw->pw_uid != uid)

			pw = 0;

	}

	if (!pw)

		pw = getpwuid(uid);

	if (!pw)

		kbd_error(EXIT_FAILURE, 0, _("unrecognized user"));

	name = strdup(pw->pw_name);

	if (!name)

		kbd_error(EXIT_FAILURE, errno, "strdup");

	endpwent();

	return name;

}