-/* Like memcoll, but S1 and S2 are known to be NUL delimited, thus no
- modification to S1 or S2 are needed. */
+/* Compare S1 (a memory block of size S1SIZE, with a NUL as last byte)
+ and S2 (a memory block of size S2SIZE, with a NUL as last byte)
+ according to the LC_COLLATE locale. S1SIZE and S2SIZE must be > 0.
+ Set errno to an error number if there is an error, and to zero
+ otherwise. */