Method seek

crates/stdlib/src/_sqlite3.rs:2420–2452

(
            &self,
            mut offset: c_int,
            origin: OptionalArg<c_int>,
            vm: &VirtualMachine,
        )

        #[pymethod]
        fn seek(
            &self,
            mut offset: c_int,
            origin: OptionalArg<c_int>,
            vm: &VirtualMachine,
        ) -> PyResult<()> {
            self.ensure_connection_open(vm)?;
            let origin = origin.unwrap_or(libc::SEEK_SET);
            let mut inner = self.inner(vm)?;
            let blob_len = inner.blob.bytes();

            let overflow_err = || vm.new_overflow_error("seek offset results in overflow");

            match origin {
                libc::SEEK_SET => {}
                libc::SEEK_CUR => {
                    offset = offset.checked_add(inner.offset).ok_or_else(overflow_err)?
                }
                libc::SEEK_END => offset = offset.checked_add(blob_len).ok_or_else(overflow_err)?,
                _ => {
                    return Err(vm.new_value_error(
                        "'origin' should be os.SEEK_SET, os.SEEK_CUR, or os.SEEK_END",
                    ));
                }
            }

            if offset < 0 || offset > blob_len {
                Err(vm.new_value_error("offset out of blob range"))
            } else {
                inner.offset = offset;
                Ok(())
            }
        }

        #[pymethod]
        fn __enter__(zelf: PyRef<Self>, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {