+/** \fn stridentcnt_P(char *a, PGM_P b)
+ * \brief counts the number of identic chars
+ *
+ * This function compares the supplyed strings and returns the index of the
+ * first char where the strings differ.
+ * \param a pointer to string in RAM
+ * \param b pointer to string in Flash
+ * \return index of the first char where \c a and \c b differ
+ */
+uint16_t stridentcnt_P(char *a, PGM_P b);
+
+/** \fn firstword_length(char *s)
+ * \brief compute the length of the first word in supllyed string
+ *
+ * This function searches for the first whitespace in the string and returns the
+ * number of chars before the first whitespace.
+ * \param s string
+ * \return number of chars in first word
+ */
+uint16_t firstword_length(char *s);
+
+/** \fn strstrip(char *str)
+ * \brief removes whitespace at the beginning and the end of a string
+ *
+ * This function removes whitespaces at the end of a string.
+ * \param str sting
+ * \return pointer to the first non-whitespace char in string
+ */
+char *strstrip(char *str);