update to new CString API

src/database.rs

@@ -25,7 +25,7 @@ impl Database {
                       name: Option<&str>,
                       flags: c_uint)
                       -> LmdbResult<Database> {
-        let c_name = name.map(|n| CString::from_slice(n.as_bytes()));
+        let c_name = name.map(|n| CString::new(n).unwrap());
         let name_ptr = if let Some(ref c_name) = c_name { c_name.as_ptr() } else { ptr::null() };
         let mut dbi: ffi::MDB_dbi = 0;
         try!(lmdb_result(ffi::mdb_dbi_open(txn, name_ptr, flags, &mut dbi)));

src/environment.rs

@@ -53,6 +53,8 @@ impl Environment {
     ///
     /// This function will fail with `LmdbError::BadRslot` if called by a thread which has an ongoing
     /// transaction.
+    ///
+    /// The database name may not contain the null character.
     pub fn open_db<'env>(&'env self, name: Option<&str>) -> LmdbResult<Database> {
         let mutex = self.dbi_open_mutex.lock();
         let txn = try!(self.begin_ro_txn());
@@ -162,6 +164,8 @@ pub struct EnvironmentBuilder {
 impl EnvironmentBuilder {
 
     /// Open an environment.
+    ///
+    /// The path may not contain the null character.
     pub fn open(&self, path: &Path, mode: FilePermission) -> LmdbResult<Environment> {
         let mut env: *mut ffi::MDB_env = ptr::null_mut();
         unsafe {
@@ -179,7 +183,7 @@ impl EnvironmentBuilder {
                                        ffi::mdb_env_close(env))
             }
             lmdb_try_with_cleanup!(ffi::mdb_env_open(env,
-                                                     CString::from_slice(path.as_os_str().as_bytes()).as_ptr(),
+                                                     CString::new(path.as_os_str().as_bytes()).unwrap().as_ptr(),
                                                      self.flags.bits(),
                                                      mode.bits() as mode_t),
                                    ffi::mdb_env_close(env));

src/error.rs

@@ -1,9 +1,7 @@
 use libc::c_int;
-use std;
-use std::mem;
 use std::error::Error;
-use std::fmt;
-use std::str;
+use std::ffi::CStr;
+use std::{fmt, str};
 
 use ffi;
 
@@ -117,9 +115,8 @@ impl Error for LmdbError {
     fn description(&self) -> &str {
         unsafe {
             // This is safe since the error messages returned from mdb_strerror are static.
-             let err: &'static *const i8 =
-                 mem::transmute(&(ffi::mdb_strerror(self.to_err_code()) as *const i8));
-             str::from_utf8_unchecked(std::ffi::c_str_to_bytes(err))
+            let err: *const i8 = ffi::mdb_strerror(self.to_err_code()) as *const i8;
+            str::from_utf8_unchecked(CStr::from_ptr(err).to_bytes())
         }
     }
 }