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diff --git a/wsutil/str_util.h b/wsutil/str_util.h
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+++ b/wsutil/str_util.h
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+/* str_util.h
+ * String utility definitions
+ *
+ * $Id$
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * 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.
+ */
+
+#ifndef __STR_UTIL_H__
+#define __STR_UTIL_H__
+
+/** Convert all upper-case ASCII letters to their ASCII lower-case
+ *  equivalents, in place, with a simple non-locale-dependent
+ *  ASCII mapping (A-Z -> a-z).
+ *  All other characters are left unchanged, as the mapping to
+ *  lower case may be locale-dependent.
+ *
+ *  The string is assumed to be in a character encoding, such as
+ *  an ISO 8859 or other EUC encoding, or UTF-8, in which all
+ *  bytes in the range 0x00 through 0x7F are ASCII characters and
+ *  non-ASCII characters are constructed from one or more bytes in
+ *  the range 0x80 through 0xFF.
+ *  
+ * @param str The string to be lower-cased.
+ */
+void ascii_strdown_inplace(gchar *str);
+
+/** Convert all lower-case ASCII letters to their ASCII upper-case
+ *  equivalents, in place, with a simple non-locale-dependent
+ *  ASCII mapping (a-z -> A-Z).
+ *  All other characters are left unchanged, as the mapping to
+ *  lower case may be locale-dependent.
+ *
+ *  The string is assumed to be in a character encoding, such as
+ *  an ISO 8859 or other EUC encoding, or UTF-8, in which all
+ *  bytes in the range 0x00 through 0x7F are ASCII characters and
+ *  non-ASCII characters are constructed from one or more bytes in
+ *  the range 0x80 through 0xFF.
+ *  
+ * @param str The string to be upper-cased.
+ */
+void ascii_strup_inplace(gchar *str);
+
+#endif /* __STR_UTIL_H__ */