From d905aafe208536203dd319e5dc48bd250180a8ef Mon Sep 17 00:00:00 2001 From: Robin Krahl Date: Tue, 28 Jan 2020 17:56:53 +0100 Subject: Refactor string handling in util The util module provides helper methods to deal with the C strings returned by libnitrokey. The current implementation has to problems: - It causes unnecessary allocations if we only want to look at the string, for example in get_serial_number. - If the conversion from a CStr to a String fails, the string pointer is not freed. Therefore this patch introduces the run_with_str function that executes a function with the string returned by libnitrokey and then makes sure that the pointer is freed correctly. --- src/device/mod.rs | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'src/device') diff --git a/src/device/mod.rs b/src/device/mod.rs index 83ab90d..067fdf6 100644 --- a/src/device/mod.rs +++ b/src/device/mod.rs @@ -18,7 +18,7 @@ use crate::error::{CommunicationError, Error, LibraryError}; use crate::otp::GenerateOtp; use crate::pws::GetPasswordSafe; use crate::util::{ - get_command_result, get_cstring, owned_str_from_ptr, result_from_string, result_or_error, + get_command_result, get_cstring, owned_str_from_ptr, result_or_error, run_with_string, }; pub use pro::Pro; @@ -375,8 +375,9 @@ pub trait Device<'a>: Authenticate<'a> + GetPasswordSafe<'a> + GenerateOtp + fmt /// # } /// ``` fn get_serial_number(&self) -> Result { - result_from_string(unsafe { nitrokey_sys::NK_device_serial_number() }) - .and_then(|s| s.parse()) + run_with_string(unsafe { nitrokey_sys::NK_device_serial_number() }, |s| { + s.parse() + }) } /// Returns the number of remaining authentication attempts for the user. The total number of -- cgit v1.2.1