binding

/*
 *  call-seq:
 *     prc.binding    => binding
 *  
 *  Returns the binding associated with <i>prc</i>. Note that
 *  <code>Kernel#eval</code> accepts either a <code>Proc</code> or a
 *  <code>Binding</code> object as its second parameter.
 *     
 *     def fred(param)
 *       proc {}
 *     end
 *     
 *     b = fred(99)
 *     eval("param", b.binding)   #=> 99
 *     eval("param", b)           #=> 99
 */

static VALUE
proc_binding(proc)
    VALUE proc;
{
    struct BLOCK *orig, *data;
    VALUE bind;

    Data_Get_Struct(proc, struct BLOCK, orig);
    bind = Data_Make_Struct(rb_cBinding,struct BLOCK,blk_mark,blk_free,data);
    MEMCPY(data, orig, struct BLOCK, 1);
    frame_dup(&data->frame);

    if (data->iter) {
        blk_copy_prev(data);
    }
    else {
        data->prev = 0;
    }

    return bind;
}