new file mode 100644
--- /dev/null
+++ b/lib/xstrdup.c
@@ -0,0 +1,32 @@
+/* xstrdup.c -- copy a string with out of memory checking
+   Copyright (C) 1990 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
+   the Free Software Foundation; either version 2, 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#if defined(USG) || defined(STDC_HEADERS)
+#include <string.h>
+#else
+#include <strings.h>
+#endif
+char *xmalloc ();
+
+/* Return a newly allocated copy of STRING.  */
+
+char *
+xstrdup (string)
+     char *string;
+{
+  return strcpy (xmalloc (strlen (string) + 1), string);
+}