+/* vi: set sw=4 ts=4: */
/*
* Mini logname implementation for busybox
*
* Copyright (C) 2000 Edward Betts <edward@debian.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
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+/* Mar 16, 2003 Manuel Novoa III (mjn3@codepoet.org)
*
+ * SUSv3 specifies the string used is that returned from getlogin().
+ * The previous implementation used getpwuid() for geteuid(), which
+ * is _not_ the same. Erik apparently made this change almost 3 years
+ * ago to avoid failing when no utmp was available. However, the
+ * correct course of action wrt SUSv3 for a failing getlogin() is
+ * a diagnostic message and an error return.
*/
+//config:config LOGNAME
+//config: bool "logname (894 bytes)"
+//config: default y
+//config: help
+//config: logname is used to print the current user's login name.
+
+//applet:IF_LOGNAME(APPLET_NOFORK(logname, logname, BB_DIR_USR_BIN, BB_SUID_DROP, logname))
+
+//kbuild:lib-$(CONFIG_LOGNAME) += logname.o
+
+/* BB_AUDIT SUSv3 compliant */
+/* http://www.opengroup.org/onlinepubs/007904975/utilities/logname.html */
+
+//usage:#define logname_trivial_usage
+//usage: ""
+//usage:#define logname_full_usage "\n\n"
+//usage: "Print the name of the current user"
+//usage:
+//usage:#define logname_example_usage
+//usage: "$ logname\n"
+//usage: "root\n"
+
+#include "libbb.h"
-#include "internal.h"
-#include <stdio.h>
+/* This is a NOFORK applet. Be very careful! */
-static const char logname_usage[] = "logname\n\n"
-"Print the name of the current user.\n";
+int logname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int logname_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
+{
+ char buf[64];
-extern int logname_main(int argc, char **argv) {
- char *cp;
+ if (argv[1]) {
+ bb_show_usage();
+ }
- if (argc > 1) usage (logname_usage);
+ /* Using _r function - avoid pulling in static buffer from libc */
+ if (getlogin_r(buf, sizeof(buf)) == 0) {
+ puts(buf);
+ return fflush_all();
+ }
- cp = getlogin ();
- if (cp) {
- puts (cp);
- exit (TRUE);
- }
- fprintf (stderr, "%s: no login name\n", argv[0]);
- exit (FALSE);
+ bb_perror_msg_and_die("getlogin");
}