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-rw-r--r--lib/myname.c49
1 files changed, 49 insertions, 0 deletions
diff --git a/lib/myname.c b/lib/myname.c
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--- /dev/null
+++ b/lib/myname.c
@@ -0,0 +1,49 @@
+/*
+ * SPDX-FileCopyrightText: 1996 - 1997, Marek Michałkiewicz
+ * SPDX-FileCopyrightText: 2003 - 2005, Tomasz Kłoczko
+ * SPDX-FileCopyrightText: 2007 - 2009, Nicolas François
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+/*
+ * myname.c - determine the current username and get the passwd entry
+ *
+ */
+
+#include <config.h>
+
+#ident "$Id$"
+
+#include "defines.h"
+#include <pwd.h>
+#include "prototypes.h"
+/*@null@*/ /*@only@*/struct passwd *get_my_pwent (void)
+{
+ struct passwd *pw;
+ const char *cp = getlogin ();
+ uid_t ruid = getuid ();
+
+ /*
+ * Try getlogin() first - if it fails or returns a non-existent
+ * username, or a username which doesn't match the real UID, fall
+ * back to getpwuid(getuid()). This should work reasonably with
+ * usernames longer than the utmp limit (8 characters), as well as
+ * shared UIDs - but not both at the same time...
+ *
+ * XXX - when running from su, will return the current user (not
+ * the original user, like getlogin() does). Does this matter?
+ */
+ if ((NULL != cp) && ('\0' != *cp)) {
+ pw = xgetpwnam (cp);
+ if ((NULL != pw) && (pw->pw_uid == ruid)) {
+ return pw;
+ }
+ if (NULL != pw) {
+ pw_free (pw);
+ }
+ }
+
+ return xgetpwuid (ruid);
+}
+