From 84480f892dd2b853c8ba7f089bf3642ef06aef6d Mon Sep 17 00:00:00 2001
From: Jan Scheer <jhscheer@users.noreply.github.com>
Date: Thu, 19 May 2022 22:55:47 +0200
Subject: [PATCH] tail: add equivalent of stdin_is_pipe_or_fifo() for Windows

* add support to determine if stdin is readable on Windows
---
 Cargo.lock                 |  1 +
 src/uu/tail/Cargo.toml     |  1 +
 src/uu/tail/src/tail.rs    | 11 +++++++----
 tests/by-util/test_tail.rs |  4 +++-
 4 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/Cargo.lock b/Cargo.lock
index 8e57d1a61..f3892fa3b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2939,6 +2939,7 @@ dependencies = [
  "notify",
  "uucore",
  "winapi 0.3.9",
+ "winapi-util",
 ]
 
 [[package]]
diff --git a/src/uu/tail/Cargo.toml b/src/uu/tail/Cargo.toml
index d08fe0ecb..d4d9c5d5e 100644
--- a/src/uu/tail/Cargo.toml
+++ b/src/uu/tail/Cargo.toml
@@ -24,6 +24,7 @@ uucore = { version=">=0.0.11", package="uucore", path="../../uucore", features=[
 
 [target.'cfg(windows)'.dependencies]
 winapi = { version="0.3", features=["fileapi", "handleapi", "processthreadsapi", "synchapi", "winbase"] }
+winapi-util = { version= "0.1.5" }
 
 [target.'cfg(unix)'.dependencies]
 nix = { version = "0.24.1", default-features = false, features=["fs"] }
diff --git a/src/uu/tail/src/tail.rs b/src/uu/tail/src/tail.rs
index ddbfe701a..fcb5d4975 100644
--- a/src/uu/tail/src/tail.rs
+++ b/src/uu/tail/src/tail.rs
@@ -1435,10 +1435,13 @@ pub fn stdin_is_pipe_or_fifo() -> bool {
     {
         platform::stdin_is_pipe_or_fifo()
     }
-    // FIXME windows has GetFileType which can determine if the file is a pipe/FIFO
-    // so this check can also be performed
-    #[cfg(not(unix))]
-    false
+    #[cfg(windows)]
+    {
+        use winapi_util;
+        winapi_util::file::typ(winapi_util::HandleRef::stdin())
+            .map(|t| t.is_disk() || t.is_pipe())
+            .unwrap_or(false)
+    }
 }
 
 pub fn stdin_is_bad_fd() -> bool {
diff --git a/tests/by-util/test_tail.rs b/tests/by-util/test_tail.rs
index 695b15f99..e2ddfb146 100644
--- a/tests/by-util/test_tail.rs
+++ b/tests/by-util/test_tail.rs
@@ -11,7 +11,9 @@ extern crate tail;
 
 use crate::common::util::*;
 use std::char::from_digit;
-use std::io::{Read, Write};
+#[cfg(unix)]
+use std::io::Read;
+use std::io::Write;
 use std::process::Stdio;
 #[cfg(unix)]
 use std::thread::sleep;