void filter_string_list(struct string_list *list, int free_util,
string_list_each_func_t want, void *cb_data);
+/*
+ * Remove any empty strings from the list. If free_util is true, call
+ * free() on the util members of any items that have to be deleted.
+ * Preserve the order of the items that are retained.
+ */
+void string_list_remove_empty_items(struct string_list *list, int free_util);
+
+/*
+ * Return the longest string in prefixes that is a prefix (in the
+ * sense of prefixcmp()) of string, or NULL if no such prefix exists.
+ * This function does not require the string_list to be sorted (it
+ * does a linear search).
+ */
+char *string_list_longest_prefix(const struct string_list *prefixes, const char *string);
+
/* Use these functions only on sorted lists: */
int string_list_has_string(const struct string_list *list, const char *string);
int insert_at, const char *string);
struct string_list_item *string_list_lookup(struct string_list *list, const char *string);
+/*
+ * Remove all but the first of consecutive entries with the same
+ * string value. If free_util is true, call free() on the util
+ * members of any items that have to be deleted.
+ */
+void string_list_remove_duplicates(struct string_list *sorted_list, int free_util);
+
/* Use these functions only on unsorted lists: */