==== memcpy ====

Copy byte buffer

=== Description ===

<code>memcpy( dest[], source[], index, length )</code>

Copy the ''source'' string to ''dest'', starting at the ''index'' byte in dest, and counting ''length'' bytes.

=== Parameters ===

| ''dest'' | destination buffer |
| ''source'' | string to be copied |
| ''index'' | offset in ''source'' |
| ''length'' | number of bytes to copy |

=== Return value ===

Returns number of bytes copied.

=== Example usage ===

<code javascript>    
    new s1{20};
    new s2{20};
    
    strcopy(s1, "ABCdef");
    memcpy(s2, s1, 3, 3);    
    
    // s2 now contains "def" - NOTE that no terminating NULL character is copied
</code>