Refactor and clean up all code

This includes:
- using idiomatic Rust
- limiting the scope of unsafe blocks
- simplifying code

1 files changed, 10 insertions, 14 deletions

diff --git a/src/pws.rs b/src/pws.rs
index a21527c..c89b73f 100644
--- a/src/pws.rs
+++ b/src/pws.rs
@@ -121,12 +121,8 @@ fn get_password_safe<'a>(
     user_pin: &str,
 ) -> Result<PasswordSafe<'a>, Error> {
     let user_pin_string = get_cstring(user_pin)?;
-    let result = unsafe {
-        get_command_result(nitrokey_sys::NK_enable_password_safe(
-            user_pin_string.as_ptr(),
-        ))
-    };
-    result.map(|()| PasswordSafe { _device: device })
+    get_command_result(unsafe { nitrokey_sys::NK_enable_password_safe(user_pin_string.as_ptr()) })
+        .map(|_| PasswordSafe { _device: device })
 }
 
 fn get_pws_result(s: String) -> Result<String, Error> {
@@ -211,7 +207,7 @@ impl<'a> PasswordSafe<'a> {
     /// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
     /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
     pub fn get_slot_name(&self, slot: u8) -> Result<String, Error> {
-        unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_name(slot)) }
+        result_from_string(unsafe { nitrokey_sys::NK_get_password_safe_slot_name(slot) })
             .and_then(get_pws_result)
     }
 
@@ -244,7 +240,7 @@ impl<'a> PasswordSafe<'a> {
     /// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
     /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
     pub fn get_slot_login(&self, slot: u8) -> Result<String, Error> {
-        unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_login(slot)) }
+        result_from_string(unsafe { nitrokey_sys::NK_get_password_safe_slot_login(slot) })
             .and_then(get_pws_result)
     }
 
@@ -277,7 +273,7 @@ impl<'a> PasswordSafe<'a> {
     /// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
     /// [`SlotNotProgrammed`]: enum.CommandError.html#variant.SlotNotProgrammed
     pub fn get_slot_password(&self, slot: u8) -> Result<String, Error> {
-        unsafe { result_from_string(nitrokey_sys::NK_get_password_safe_slot_password(slot)) }
+        result_from_string(unsafe { nitrokey_sys::NK_get_password_safe_slot_password(slot) })
             .and_then(get_pws_result)
     }
 
@@ -317,14 +313,14 @@ impl<'a> PasswordSafe<'a> {
         let name_string = get_cstring(name)?;
         let login_string = get_cstring(login)?;
         let password_string = get_cstring(password)?;
-        unsafe {
-            get_command_result(nitrokey_sys::NK_write_password_safe_slot(
+        get_command_result(unsafe {
+            nitrokey_sys::NK_write_password_safe_slot(
                 slot,
                 name_string.as_ptr(),
                 login_string.as_ptr(),
                 password_string.as_ptr(),
-            ))
-        }
+            )
+        })
     }
 
     /// Erases the given slot.  Erasing clears the stored name, login and password (if the slot was
@@ -353,7 +349,7 @@ impl<'a> PasswordSafe<'a> {
     ///
     /// [`InvalidSlot`]: enum.LibraryError.html#variant.InvalidSlot
     pub fn erase_slot(&self, slot: u8) -> Result<(), Error> {
-        unsafe { get_command_result(nitrokey_sys::NK_erase_password_safe_slot(slot)) }
+        get_command_result(unsafe { nitrokey_sys::NK_erase_password_safe_slot(slot) })
     }
 }