Add more stdio_ext functions

src/header/stdio/ext.rs

@@ -0,0 +1,23 @@
+use header::stdio::{FILE, F_NORD, F_NOWR};
+use platform::types::*;
+
+#[no_mangle]
+pub extern "C" fn __freadable(stream: *mut FILE) -> c_int {
+    let mut stream = unsafe { &mut *stream }.lock();
+
+    (stream.flags & F_NORD == 0) as c_int
+}
+
+#[no_mangle]
+pub extern "C" fn __fwritable(stream: *mut FILE) -> c_int {
+    let mut stream = unsafe { &mut *stream }.lock();
+
+    (stream.flags & F_NOWR == 0) as c_int
+}
+
+#[no_mangle]
+pub extern "C" fn __fpending(stream: *mut FILE) -> size_t {
+    let mut stream = unsafe { &mut *stream }.lock();
+
+    stream.writer.inner.buf.len() as size_t
+}