__attribute__((__warn_unused_result__));
extern int add_string (char ***argv, int *size, int *alloc, const char *str);
-extern int count_strings (char *const *argv);
+extern size_t count_strings (char *const *argv);
extern void sort_strings (char **argv, int len);
extern void free_strings (char **argv);
extern void free_stringslen (char **argv, int len);