+/* Compare S1 and S2. */
+/* Similar to the gnulib function memcmp2(). */
+extern int
+ u8_cmp2 (const uint8_t *s1, size_t n1, const uint8_t *s2, size_t n2);
+extern int
+ u16_cmp2 (const uint16_t *s1, size_t n1, const uint16_t *s2, size_t n2);
+extern int
+ u32_cmp2 (const uint32_t *s1, size_t n1, const uint32_t *s2, size_t n2);
+