void *silc_smemdup(SilcStack stack, const void *ptr, SilcUInt32 size);

    Duplicates the memory area indicated by `ptr' which is the size of
    `size' bytes.  Returns pointer to the duplicated memory area.  This
    NULL terminates the dupped memory area by allocating `size' + 1
    bytes, so this function can be used to duplicate strings that does not
    have NULL termination.  This function allocates aligned memory so
    it can be used to duplicate also structures.  Returns NULL on error.

    Be careful with this function:  do not free the returned pointer
    explicitly and do not save the returned pointer to a permanent
    location.

    If `stack' is NULL this function calls silc_memdup.