--- /dev/null
+/* dbz_strings.h */
+/*
+ * This file is part of AnonAccess, an access system which can be used
+ * to open door or doing other things with an anonymity featured
+ * account managment.
+ * Copyright (C) 2006, 2007, 2008, 2009 Daniel Otte (daniel.otte@rub.de)
+ *
+ * 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 3 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, see <http://www.gnu.org/licenses/>.
+ */
+
+
+#ifndef DBZ_STRINGS_H_
+#define DBZ_STRINGS_H_
+
+/** \file dbz_strings.h
+ * \author Daniel Otte
+ * \email daniel.otte@rub.de
+ * \license GPLv3 or later
+ * \brief functions for handling of double-zero-terminated strings
+ *
+ */
+
+#include <stdint.h>
+#include <avr/pgmspace.h>
+
+/** \fn uint8_t dbz_strcount(const char* str)
+ * \brief count stings in dbz-terminated string
+ *
+ * Count the single zero terminated string in a
+ * double terminated string
+ * \param str pointer to the double-zero-terminated string
+ */
+uint8_t dbz_strcount(const char* str);
+
+/** \fn void dbz_splitup(char* dbzstr, char** strings)
+ * \brief split up a dbz-terminated string
+ *
+ * Fills an array with pointers to the single terminated string
+ * in a double-zero-terminated string
+ * \param dbzstr pointer to the double-zero-terminated string
+ * \param strings pointer to the array of strings (char pointers)
+ */
+void dbz_splitup(char* dbzstr, char** strings);
+
+/** \fn uint8_t dbz_strcount_P(PGM_P str)
+ * \brief count stings in dbz-terminated string in flash
+ *
+ * Count the single zero terminated string in a
+ * double terminated string which is placed in flash (progmem)
+ * \param str pointer to the double-zero-terminated string in flash
+ */
+uint8_t dbz_strcount_P(PGM_P str);
+
+/** \fn void dbz_splitup_P(PGM_P dbzstr, PGM_P* strings)
+ * \brief split up a dbz-terminated string in flash
+ *
+ * Fills an array with pointers (PGM_P) to the single terminated string
+ * in a double-zero-terminated string which is placed in flash
+ * \param dbzstr pointer to the double-zero-terminated string in flash
+ * \param strings pointer to the array of strings (PGM_P)
+ */
+void dbz_splitup_P(PGM_P dbzstr, PGM_P* strings);
+
+#endif /*DBZ_STRINGS_H_*/