/* Provide a working getlogin_r for systems which lack it.
- Copyright (C) 2005 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2006, 2007 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
/* written by Paul Eggert and Derek Price */
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
-#include "getlogin_r.h"
+/* Specification. */
+#include <unistd.h>
#include <errno.h>
#include <string.h>
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
-
#if !HAVE_DECL_GETLOGIN
char *getlogin (void);
#endif
-/* See getlogin_r.h for documentation. */
+/* See unistd.in.h for documentation. */
int
getlogin_r (char *name, size_t size)
{
errno = 0;
n = getlogin ();
+
+ /* A system function like getlogin_r is never supposed to set errno
+ to zero, so make sure errno is nonzero here. ENOENT is a
+ reasonable errno value if getlogin returns NULL. */
+ if (!errno)
+ errno = ENOENT;
+
if (!n)
- return errno ? errno : ENOENT;
+ return errno;
nlen = strlen (n);
if (size <= nlen)
return ERANGE;