[svn-upgrade] Integrating new upstream version, shadow (19990709)

libmisc/myname.c

@@ -0,0 +1,41 @@
+/*
+ * myname.c - determine the current username and get the passwd entry
+ *
+ * Copyright (C) 1996 Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>
+ *
+ * This code may be freely used, modified and distributed for any purpose.
+ * There is no warranty, if it breaks you have to keep both pieces, etc.
+ * If you improve it, please send me your changes.  Thanks!
+ */
+
+#include <config.h>
+
+#include "rcsid.h"
+RCSID("$Id: myname.c,v 1.2 1997/12/07 23:27:07 marekm Exp $")
+
+#include "defines.h"
+#include <pwd.h>
+#include "prototypes.h"
+
+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 (cp && *cp && (pw = getpwnam(cp)) && pw->pw_uid == ruid)
+		return pw;
+
+	return getpwuid(ruid);
+}