Compares byte strings.
    Format
      #include  <strings.h>
      void bcmp  (const void *string1, const void *string2, size_t length);
1 – Arguments
 string1, string2
    The byte strings to be compared.
 length
    The length (in bytes) of the strings.
2 – Description
    The bcmp function compares the byte string in string1 against the
    byte string in string2.
    Unlike the string functions, there is no checking for null bytes.
    Zero-length strings are always identical.
    Note that bcmp is equivalent to memcmp, which is defined by
    the ANSI C Standard. Therefore, using memcmp is recommended for
    portable programs.
3 – Return Values
    0                  The strings are identical.
    Nonzero            The strings are not identical.