Use `null()`/`null_mut()` instead of `0 as *const T`/`0 as *mut T`

6 files changed, 16 insertions, 14 deletions

diff --git a/src/libstd/sys/unix/backtrace/printing/libbacktrace.rs b/src/libstd/sys/unix/backtrace/printing/libbacktrace.rs
index 711e241161d..5640eb81f2a 100644
--- a/src/libstd/sys/unix/backtrace/printing/libbacktrace.rs
+++ b/src/libstd/sys/unix/backtrace/printing/libbacktrace.rs
@@ -123,7 +123,7 @@ pub fn print(w: &mut Write, idx: isize, addr: *mut libc::c_void,
     // FIXME: We also call self_exe_name() on DragonFly BSD. I haven't
     //        tested if this is required or not.
     unsafe fn init_state() -> *mut backtrace_state {
-        static mut STATE: *mut backtrace_state = 0 as *mut backtrace_state;
+        static mut STATE: *mut backtrace_state = ptr::null_mut();
         static mut LAST_FILENAME: [libc::c_char; 256] = [0; 256];
         if !STATE.is_null() { return STATE }
         let selfname = if cfg!(target_os = "freebsd") ||
diff --git a/src/libstd/sys/unix/os.rs b/src/libstd/sys/unix/os.rs
index fa31ac682d4..70be04b631a 100644
--- a/src/libstd/sys/unix/os.rs
+++ b/src/libstd/sys/unix/os.rs
@@ -291,7 +291,7 @@ pub fn args() -> Args {
     };
     Args {
         iter: vec.into_iter(),
-        _dont_send_or_sync_me: 0 as *mut (),
+        _dont_send_or_sync_me: ptr::null_mut(),
     }
 }
 
@@ -347,7 +347,7 @@ pub fn args() -> Args {
         }
     }
 
-    Args { iter: res.into_iter(), _dont_send_or_sync_me: 0 as *mut _ }
+    Args { iter: res.into_iter(), _dont_send_or_sync_me: ptr::null_mut() }
 }
 
 #[cfg(any(target_os = "linux",
@@ -363,7 +363,7 @@ pub fn args() -> Args {
     let v: Vec<OsString> = bytes.into_iter().map(|v| {
         OsStringExt::from_vec(v)
     }).collect();
-    Args { iter: v.into_iter(), _dont_send_or_sync_me: 0 as *mut _ }
+    Args { iter: v.into_iter(), _dont_send_or_sync_me: ptr::null_mut() }
 }
 
 pub struct Env {
@@ -403,7 +403,7 @@ pub fn env() -> Env {
             result.push(parse(CStr::from_ptr(*environ).to_bytes()));
             environ = environ.offset(1);
         }
-        Env { iter: result.into_iter(), _dont_send_or_sync_me: 0 as *mut _ }
+        Env { iter: result.into_iter(), _dont_send_or_sync_me: ptr::null_mut() }
     };
 
     fn parse(input: &[u8]) -> (OsString, OsString) {
@@ -481,7 +481,7 @@ pub fn home_dir() -> Option<PathBuf> {
         loop {
             let mut buf = Vec::with_capacity(amt);
             let mut passwd: c::passwd = mem::zeroed();
-            let mut result = 0 as *mut _;
+            let mut result = ptr::null_mut();
             match c::getpwuid_r(me, &mut passwd, buf.as_mut_ptr(),
                                 buf.capacity() as libc::size_t,
                                 &mut result) {
diff --git a/src/libstd/sys/unix/process.rs b/src/libstd/sys/unix/process.rs
index 59798e938a6..12ca31ce5e1 100644
--- a/src/libstd/sys/unix/process.rs
+++ b/src/libstd/sys/unix/process.rs
@@ -405,7 +405,7 @@ fn make_envp(env: Option<&HashMap<OsString, OsString>>)
 
         (ptrs.as_ptr() as *const _, tmps, ptrs)
     } else {
-        (0 as *const _, Vec::new(), Vec::new())
+        (ptr::null(), Vec::new(), Vec::new())
     }
 }
 
diff --git a/src/libstd/sys/unix/stack_overflow.rs b/src/libstd/sys/unix/stack_overflow.rs
index 1aa75fa18b7..baff3c6bcbb 100644
--- a/src/libstd/sys/unix/stack_overflow.rs
+++ b/src/libstd/sys/unix/stack_overflow.rs
@@ -93,7 +93,7 @@ mod imp {
         // See comment above for why this function returns.
     }
 
-    static mut MAIN_ALTSTACK: *mut libc::c_void = 0 as *mut libc::c_void;
+    static mut MAIN_ALTSTACK: *mut libc::c_void = ptr::null_mut();
 
     pub unsafe fn init() {
         PAGE_SIZE = ::sys::os::page_size();
@@ -155,7 +155,7 @@ mod imp {
     }
 
     pub unsafe fn make_handler() -> super::Handler {
-        super::Handler { _data: 0 as *mut libc::c_void }
+        super::Handler { _data: ptr::null_mut() }
     }
 
     pub unsafe fn drop_handler(_handler: &mut super::Handler) {
diff --git a/src/libstd/sys/unix/sync.rs b/src/libstd/sys/unix/sync.rs
index 9c8a1f4ca40..4e49b6473c9 100644
--- a/src/libstd/sys/unix/sync.rs
+++ b/src/libstd/sys/unix/sync.rs
@@ -59,15 +59,16 @@ extern {
           target_os = "openbsd"))]
 mod os {
     use libc;
+    use ptr;
 
     pub type pthread_mutex_t = *mut libc::c_void;
     pub type pthread_mutexattr_t = *mut libc::c_void;
     pub type pthread_cond_t = *mut libc::c_void;
     pub type pthread_rwlock_t = *mut libc::c_void;
 
-    pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = 0 as *mut _;
-    pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = 0 as *mut _;
-    pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = 0 as *mut _;
+    pub const PTHREAD_MUTEX_INITIALIZER: pthread_mutex_t = ptr::null_mut();
+    pub const PTHREAD_COND_INITIALIZER: pthread_cond_t = ptr::null_mut();
+    pub const PTHREAD_RWLOCK_INITIALIZER: pthread_rwlock_t = ptr::null_mut();
     pub const PTHREAD_MUTEX_RECURSIVE: libc::c_int = 2;
 }
 
@@ -213,6 +214,7 @@ mod os {
 #[cfg(target_os = "android")]
 mod os {
     use libc;
+    use ptr;
 
     #[repr(C)]
     pub struct pthread_mutex_t { value: libc::c_int }
@@ -243,7 +245,7 @@ mod os {
         writerThreadId: 0,
         pendingReaders: 0,
         pendingWriters: 0,
-        reserved: [0 as *mut _; 4],
+        reserved: [ptr::null_mut(); 4],
     };
     pub const PTHREAD_MUTEX_RECURSIVE: libc::c_int = 1;
 }
diff --git a/src/libstd/sys/unix/thread.rs b/src/libstd/sys/unix/thread.rs
index 8d59461f1e4..5a551e2b3f3 100644
--- a/src/libstd/sys/unix/thread.rs
+++ b/src/libstd/sys/unix/thread.rs
@@ -72,7 +72,7 @@ impl Thread {
 
         extern fn thread_start(main: *mut libc::c_void) -> *mut libc::c_void {
             unsafe { start_thread(main); }
-            0 as *mut _
+            ptr::null_mut()
         }
     }