Method: Fiddle::Pointer#initialize

Defined in:
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.



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# File 'pointer.c', line 216

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);
  }
  RB_OBJ_WRITE(self, &data->wrap[0], wrap);
  RB_OBJ_WRITE(self, &data->wrap[1], funcwrap);
  data->ptr  = p;
  data->size = s;
  data->free = f;
    }

    return Qnil;
}