bcopy, bcmp, bzero − byte string operations

The functions and operate on variable length strings of bytes.  They do not check for null bytes as the routines in do.  copies bytes from string to the string Bcopy is not guaranteed to work if the source and destination strings overlap.  compares byte string against byte string returning zero if they are identical, non-zero otherwise.  Both strings are assumed to be bytes long.  places 0 bytes in the string The routine take parameters backwards from