From 0f1f548b5e181cf03751a8c0d5ba7e25722d06a4 Mon Sep 17 00:00:00 2001
From: Sylvestre Ledru <sylvestre@debian.org>
Date: Tue, 31 Mar 2026 22:31:42 +0200
Subject: [PATCH] cat: add WASI stub for is_unsafe_overwrite and add to
 feat_wasm

WASI has no fstat-based device/inode checks, so always return false
(assume safe) for the overwrite detection.
---
 Cargo.toml                     | 1 +
 src/uu/cat/src/platform/mod.rs | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/Cargo.toml b/Cargo.toml
index 4f98541268e..f6df804e486 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -184,6 +184,7 @@ feat_wasm = [
   "base32",
   "base64",
   "basenc",
+  "cat",
   "cut",
   "date",
   "dircolors",
diff --git a/src/uu/cat/src/platform/mod.rs b/src/uu/cat/src/platform/mod.rs
index 3fa27a27686..80ef6e233ac 100644
--- a/src/uu/cat/src/platform/mod.rs
+++ b/src/uu/cat/src/platform/mod.rs
@@ -9,6 +9,12 @@ pub use self::unix::is_unsafe_overwrite;
 #[cfg(windows)]
 pub use self::windows::is_unsafe_overwrite;
 
+// WASI: no fstat-based device/inode checks available; assume safe.
+#[cfg(target_os = "wasi")]
+pub fn is_unsafe_overwrite<I, O>(_input: &I, _output: &O) -> bool {
+    false
+}
+
 #[cfg(unix)]
 mod unix;