void *silc_smalloc(SilcStack stack, SilcUInt32 size);

    Allocate memory block of size of `size' from the stack indicated by
    `stack' and return pointer to it.  Returns NULL on error.  This
    function allocates aligned memory so it can be used to allocate
    memory for structures, for example.  If you allocate strings or
    data buffers using silc_smalloc_ua is recommended instead of this
    function.

    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_malloc.