+void qsort (void *array, size_t cnt, size_t size,
+ int (*compare) (const void *, const void *));
+void *bsearch (const void *key, const void *array, size_t cnt,
+ size_t size, int (*compare) (const void *, const void *));
+
+/* Nonstandard functions. */
+void sort (void *array, size_t cnt, size_t size,
+ int (*compare) (const void *, const void *, void *aux),
+ void *aux);
+void *binary_search (const void *key, const void *array, size_t cnt,
+ size_t size,
+ int (*compare) (const void *, const void *, void *aux),
+ void *aux);