From 62887c7a58b0f5e4045a418aa2df09e9b2a54654 Mon Sep 17 00:00:00 2001
From: zhitkoff <zhitkoff@gmail.com>
Date: Thu, 2 Nov 2023 10:36:15 -0400
Subject: [PATCH] split: directory separator in additional suffix

---
 src/uu/split/src/filenames.rs | 3 ++-
 tests/by-util/test_split.rs   | 5 ++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/uu/split/src/filenames.rs b/src/uu/split/src/filenames.rs
index 80243c2bc..843e11ea0 100644
--- a/src/uu/split/src/filenames.rs
+++ b/src/uu/split/src/filenames.rs
@@ -40,6 +40,7 @@ use crate::{
 };
 use clap::ArgMatches;
 use std::fmt;
+use std::path::is_separator;
 use uucore::display::Quotable;
 use uucore::error::{UResult, USimpleError};
 
@@ -230,7 +231,7 @@ impl Suffix {
             .get_one::<String>(OPT_ADDITIONAL_SUFFIX)
             .unwrap()
             .to_string();
-        if additional.contains('/') || additional.contains('\\') {
+        if additional.chars().any(is_separator) {
             return Err(SuffixError::ContainsSeparator(additional));
         }
 
diff --git a/tests/by-util/test_split.rs b/tests/by-util/test_split.rs
index e0e85be48..aec6f0594 100644
--- a/tests/by-util/test_split.rs
+++ b/tests/by-util/test_split.rs
@@ -247,11 +247,14 @@ fn test_split_additional_suffix() {
 }
 
 #[test]
-fn test_additional_suffix_no_slash() {
+fn test_additional_suffix_dir_separator() {
+    #[cfg(unix)]
     new_ucmd!()
         .args(&["--additional-suffix", "a/b"])
         .fails()
         .usage_error("invalid suffix 'a/b', contains directory separator");
+
+    #[cfg(windows)]
     new_ucmd!()
         .args(&["--additional-suffix", "a\\b"])
         .fails()