From ee721ebf4e4288fc83a3fab3c26bd5a8d2bc6d0e Mon Sep 17 00:00:00 2001
From: snobee <salexwattson@gmail.com>
Date: Wed, 2 Feb 2022 21:22:28 -0800
Subject: [PATCH 1/2] head: handle multibyte numeric utf-8 chars

---
 src/uu/head/src/parse.rs   | 2 +-
 tests/by-util/test_head.rs | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/uu/head/src/parse.rs b/src/uu/head/src/parse.rs
index 3f1d8ef42..b44a8b69d 100644
--- a/src/uu/head/src/parse.rs
+++ b/src/uu/head/src/parse.rs
@@ -20,7 +20,7 @@ pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>
         let mut has_num = false;
         let mut last_char = 0 as char;
         for (n, c) in &mut chars {
-            if c.is_numeric() {
+            if c.is_digit(10) {
                 has_num = true;
                 num_end = n;
             } else {
diff --git a/tests/by-util/test_head.rs b/tests/by-util/test_head.rs
index 246f5b62a..25410d76f 100644
--- a/tests/by-util/test_head.rs
+++ b/tests/by-util/test_head.rs
@@ -306,6 +306,10 @@ fn test_head_invalid_num() {
                 ));
         }
     }
+    new_ucmd!()
+        .args(&["-c", "-³"])
+        .fails()
+        .stderr_is("head: invalid number of bytes: '³'");
 }
 
 #[test]

From 3586465917372aa3a95f677a9c387749cd5a4a85 Mon Sep 17 00:00:00 2001
From: Hanif Bin Ariffin <hanif.ariffin.43262@gmail.com>
Date: Thu, 3 Feb 2022 20:17:53 +0800
Subject: [PATCH 2/2] dont use is_numeric to check for digits

Signed-off-by: Hanif Bin Ariffin <hanif.ariffin.43262@gmail.com>
---
 src/uu/tail/src/parse.rs   | 2 +-
 tests/by-util/test_stat.rs | 6 ++++++
 tests/by-util/test_tail.rs | 4 ++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/src/uu/tail/src/parse.rs b/src/uu/tail/src/parse.rs
index 1c4f36bbd..ea9df9a02 100644
--- a/src/uu/tail/src/parse.rs
+++ b/src/uu/tail/src/parse.rs
@@ -19,7 +19,7 @@ pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>
         let mut has_num = false;
         let mut last_char = 0 as char;
         for (n, c) in &mut chars {
-            if c.is_numeric() {
+            if c.is_digit(10) {
                 has_num = true;
                 num_end = n;
             } else {
diff --git a/tests/by-util/test_stat.rs b/tests/by-util/test_stat.rs
index 9bbb1c1ca..8c1255a88 100644
--- a/tests/by-util/test_stat.rs
+++ b/tests/by-util/test_stat.rs
@@ -36,6 +36,12 @@ fn test_group_num() {
     assert_eq!("", group_num(""));
 }
 
+#[test]
+#[should_panic]
+fn test_group_num_panic_if_invalid_numeric_characters() {
+    group_num("³³³³³");
+}
+
 #[cfg(test)]
 mod test_generate_tokens {
     use super::*;
diff --git a/tests/by-util/test_tail.rs b/tests/by-util/test_tail.rs
index dcdb2e9dc..ebcd29cf5 100644
--- a/tests/by-util/test_tail.rs
+++ b/tests/by-util/test_tail.rs
@@ -491,6 +491,10 @@ fn test_tail_invalid_num() {
                 ));
         }
     }
+    new_ucmd!()
+        .args(&["-c", "-³"])
+        .fails()
+        .stderr_is("tail: invalid number of bytes: '³'");
 }
 
 #[test]