Reduce warnings

src/header/stdio/default.rs

@@ -1,7 +1,6 @@
-use super::{constants, Buffer, BUFSIZ, FILE, UNGET};
+use super::{constants, Buffer, BUFSIZ, FILE};
 use core::cell::UnsafeCell;
 use core::ptr;
-use core::sync::atomic::AtomicBool;
 
 use fs::File;
 use io::LineWriter;

src/header/stdio/helpers.rs

@@ -1,6 +1,4 @@
 use alloc::boxed::Box;
-use core::sync::atomic::AtomicBool;
-use core::{mem, ptr};
 
 use fs::File;
 use header::errno;

src/header/stdio/mod.rs

@@ -3,10 +3,9 @@
 use alloc::borrow::{Borrow, BorrowMut};
 use alloc::boxed::Box;
 use alloc::vec::Vec;
+use core::fmt;
 use core::fmt::Write as WriteFmt;
-use core::fmt::{self, Error};
 use core::ops::{Deref, DerefMut};
-use core::sync::atomic::{self, AtomicBool, Ordering};
 use core::{ptr, str, slice};
 use va_list::VaList as va_list;
 
@@ -16,7 +15,7 @@ use header::errno::{self, STR_ERROR};
 use header::fcntl;
 use header::stdlib::mkstemp;
 use header::string::strlen;
-use io::{self, BufRead, LineWriter, SeekFrom, Read, Write};
+use io::{self, BufRead, LineWriter, Read, Write};
 use mutex::Mutex;
 use platform::types::*;
 use platform::{Pal, Sys};
@@ -513,7 +512,7 @@ pub extern "C" fn ftell(stream: *mut FILE) -> c_long {
 /// Get the current position of the cursor in the file
 #[no_mangle]
 pub extern "C" fn ftello(stream: *mut FILE) -> off_t {
-    let mut stream = unsafe { &mut *stream }.lock();
+    let stream = unsafe { &mut *stream }.lock();
     let pos = Sys::lseek(*stream.file, 0, SEEK_CUR);
     if pos < 0 {
         return -1;

src/header/stdio/printf.rs

@@ -1,14 +1,12 @@
 use alloc::string::String;
 use alloc::string::ToString;
 use alloc::vec::Vec;
-use core::fmt::Write as CoreWrite;
 use core::ops::Range;
-use core::{fmt, ptr, slice, str};
+use core::{fmt, slice};
 
-use c_str::CStr;
 use io::{self, Write};
+use platform;
 use platform::types::*;
-use platform::{self, WriteByte};
 use va_list::{VaList, VaPrimitive};
 
 #[derive(PartialEq, Eq)]
@@ -221,7 +219,7 @@ fn fmt_float_exp<W: Write>(
     }
 
     let string = float_string(float, precision, trim);
-    let mut len = string.len() + 2 + 2.max(exp_len);
+    let len = string.len() + 2 + 2.max(exp_len);
 
     pad(w, !left, b' ', len..pad_space)?;
     let bytes = if string.starts_with('-') {
@@ -261,8 +259,8 @@ fn fmt_float_normal<W: Write>(
 
     Ok(string.len())
 }
-unsafe fn inner_printf<W: Write>(w: W, format: *const c_char, mut ap: VaList) -> io::Result<c_int> {
-    let mut w = &mut platform::CountingWriter::new(w);
+unsafe fn inner_printf<W: Write>(w: W, format: *const c_char, ap: VaList) -> io::Result<c_int> {
+    let w = &mut platform::CountingWriter::new(w);
     let mut ap = BufferedVaList::new(ap);
     let mut format = format as *const u8;