wc: split WordCountable trait to exclude inner_file on wasi

src/uu/wc/src/countable.rs

@@ -20,13 +20,20 @@ pub trait WordCountable: AsFd + AsRawFd + Read {
     fn inner_file(&mut self) -> Option<&mut File>;
 }
 
-#[cfg(not(unix))]
+#[cfg(all(not(unix), not(target_os = "wasi")))]
 pub trait WordCountable: Read {
     type Buffered: BufRead;
     fn buffered(self) -> Self::Buffered;
     fn inner_file(&mut self) -> Option<&mut File>;
 }
 
+#[cfg(target_os = "wasi")]
+pub trait WordCountable: Read {
+    type Buffered: BufRead;
+    fn buffered(self) -> Self::Buffered;
+}
+
+#[cfg(not(target_os = "wasi"))]
 impl WordCountable for StdinLock<'_> {
     type Buffered = Self;
 
@@ -38,6 +45,16 @@ impl WordCountable for StdinLock<'_> {
     }
 }
 
+#[cfg(target_os = "wasi")]
+impl WordCountable for StdinLock<'_> {
+    type Buffered = Self;
+
+    fn buffered(self) -> Self::Buffered {
+        self
+    }
+}
+
+#[cfg(not(target_os = "wasi"))]
 impl WordCountable for File {
     type Buffered = BufReader<Self>;
 
@@ -49,3 +66,12 @@ impl WordCountable for File {
         Some(self)
     }
 }
+
+#[cfg(target_os = "wasi")]
+impl WordCountable for File {
+    type Buffered = BufReader<Self>;
+
+    fn buffered(self) -> Self::Buffered {
+        BufReader::new(self)
+    }
+}