Method: Fiddle::Pointer#initialize

Defined in:

ext/fiddle/pointer.c

#Fiddle::Pointer.new(address) ⇒ Object #new(address, size) ⇒ Object #new(address, size, freefunc) ⇒ Object

Create a new pointer to address with an optional size and freefunc.

freefunc will be called when the instance is garbage collected.

# File 'ext/fiddle/pointer.c', line 211

static VALUE
rb_fiddle_ptr_initialize(int argc, VALUE argv[], VALUE self)
{
    VALUE ptr, sym, size, wrap = 0, funcwrap = 0;
    struct ptr_data *data;
    void *p = NULL;
    freefunc_t f = NULL;
    long s = 0;

    if (rb_scan_args(argc, argv, "12", &ptr, &size, &sym) >= 1) {
	VALUE addrnum = rb_Integer(ptr);
	if (addrnum != ptr) wrap = ptr;
	p = NUM2PTR(addrnum);
    }
    if (argc >= 2) {
	s = NUM2LONG(size);
    }
    if (argc >= 3) {
	f = get_freefunc(sym, &funcwrap);
    }

    if (p) {
	TypedData_Get_Struct(self, struct ptr_data, &fiddle_ptr_data_type, data);
	if (data->ptr && data->free) {
	    /* Free previous memory. Use of inappropriate initialize may cause SEGV. */
	    (*(data->free))(data->ptr);
	}
	data->wrap[0] = wrap;
	data->wrap[1] = funcwrap;
	data->ptr  = p;
	data->size = s;
	data->free = f;
    }

    return Qnil;
}