use global extern crate

.gitignore

@@ -7,3 +7,7 @@ Cargo.lock
 _rust_rocksdb*
 *rlib
 tags
+
+.idea/
+out/
+*.iml
\ No newline at end of file

src/comparator.rs

@@ -12,8 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-extern crate libc;
-use self::libc::{c_char, c_int, c_void, size_t};
+use libc::{c_char, c_int, c_void, size_t};
 use std::ffi::CString;
 use std::mem;
 use std::slice;

src/ffi.rs

@@ -12,8 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-extern crate libc;
-use self::libc::{c_char, c_int, c_void, size_t};
+use libc::{self, c_char, c_int, c_void, size_t};
 use std::ffi::CStr;
 use std::str::from_utf8;
 
@@ -92,7 +91,7 @@ pub fn error_message(ptr: *const i8) -> String {
     let c_str = unsafe { CStr::from_ptr(ptr as *const _) };
     let s = from_utf8(c_str.to_bytes()).unwrap().to_owned();
     unsafe {
-        libc::free(ptr as *mut libc::c_void);
+        libc::free(ptr as *mut c_void);
     }
     s
 }

src/lib.rs

@@ -12,14 +12,17 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-pub use ffi as rocksdb_ffi;
-pub use ffi::{DBCompactionStyle, DBComparator, new_bloom_filter};
-pub use rocksdb::{DB, DBIterator, DBVector, Direction, IteratorMode, Writable,
-                  WriteBatch};
-pub use rocksdb_options::{BlockBasedOptions, Options, WriteOptions};
-pub use merge_operator::MergeOperands;
+extern crate libc;
+
 pub mod rocksdb;
 pub mod ffi;
 pub mod rocksdb_options;
 pub mod merge_operator;
 pub mod comparator;
+
+pub use ffi::{DBCompactionStyle, DBComparator, new_bloom_filter,
+              self as rocksdb_ffi};
+pub use rocksdb::{DB, DBIterator, DBVector, Direction, IteratorMode, Writable,
+                  WriteBatch};
+pub use rocksdb_options::{BlockBasedOptions, Options, WriteOptions};
+pub use merge_operator::MergeOperands;

src/merge_operator.rs

@@ -12,8 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-extern crate libc;
-use self::libc::{c_char, c_int, c_void, size_t};
+use libc::{self, c_char, c_int, c_void, size_t};
 use std::ffi::CString;
 use std::mem;
 use std::ptr;

src/rocksdb.rs

@@ -12,9 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-
-extern crate libc;
-
 use std::collections::BTreeMap;
 use std::ffi::CString;
 use std::fs;
@@ -23,7 +20,7 @@ use std::path::Path;
 use std::slice;
 use std::str::from_utf8;
 
-use self::libc::{c_void, size_t};
+use libc::{self, c_int, c_void, size_t};
 
 use rocksdb_ffi::{self, DBCFHandle, error_message};
 use rocksdb_options::{Options, WriteOptions};
@@ -313,7 +310,7 @@ impl DB {
             let nfam = cfs_v.len();
             unsafe {
                 db = rocksdb_ffi::rocksdb_open_column_families(opts.inner, cpath_ptr as *const _,
-                                                               nfam as libc::c_int,
+                                                               nfam as c_int,
                                                                cfnames.as_ptr() as *const _,
                                                                copts, handles, err_ptr);
             }
@@ -848,7 +845,7 @@ impl Deref for DBVector {
 impl Drop for DBVector {
     fn drop(&mut self) {
         unsafe {
-            libc::free(self.base as *mut libc::c_void);
+            libc::free(self.base as *mut c_void);
         }
     }
 }

src/rocksdb_options.rs

@@ -12,8 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-extern crate libc;
-use self::libc::{c_int, size_t};
+use libc::{c_int, size_t};
 use std::ffi::CString;
 use std::mem;