From 020124b5a63663fb9591d3b6a5dbd4ed5fe8946b Mon Sep 17 00:00:00 2001
From: oech3 <79379754+oech3@users.noreply.github.com>
Date: Sat, 25 Apr 2026 12:40:17 +0900
Subject: [PATCH] wc: Fix fallback when pipe() or splice() failed

---
 src/uu/wc/src/count_fast.rs | 8 +++-----
 1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/src/uu/wc/src/count_fast.rs b/src/uu/wc/src/count_fast.rs
index 2df9efc00..6e0d34fae 100644
--- a/src/uu/wc/src/count_fast.rs
+++ b/src/uu/wc/src/count_fast.rs
@@ -48,7 +48,7 @@ fn count_bytes_using_splice(fd: &impl AsFd) -> Result<usize, usize> {
         // - sender without splice is bottleneck of our wc -c
         loop {
             match splice(fd, &null_file, MAX_ROOTLESS_PIPE_SIZE) {
-                Ok(0) => break,
+                Ok(0) => return Ok(byte_count),
                 Ok(res) => byte_count += res,
                 Err(_) => return Err(byte_count),
             }
@@ -57,7 +57,7 @@ fn count_bytes_using_splice(fd: &impl AsFd) -> Result<usize, usize> {
         // input is not pipe. needs broker to use splice() with additional cost
         loop {
             match splice(fd, &pipe_wr, MAX_ROOTLESS_PIPE_SIZE) {
-                Ok(0) => break,
+                Ok(0) => return Ok(byte_count),
                 Ok(res) => {
                     byte_count += res;
                     splice_exact(&pipe_rd, &null_file, res).map_err(|_| byte_count)?;
@@ -66,10 +66,8 @@ fn count_bytes_using_splice(fd: &impl AsFd) -> Result<usize, usize> {
             }
         }
     } else {
-        return Ok(0_usize);
+        Err(0)
     }
-
-    Ok(byte_count)
 }
 
 /// In the special case where we only need to count the number of bytes. There