From f10faf21bc328fb5704cdb0361c5084e20e84d7a Mon Sep 17 00:00:00 2001
From: John Shin <shinhs0506@gmail.com>
Date: Tue, 30 May 2023 11:26:39 -0700
Subject: [PATCH] head: interpret size as decimal

---
 src/uu/head/src/parse.rs   | 8 +++++++-
 tests/by-util/test_head.rs | 9 +++++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/src/uu/head/src/parse.rs b/src/uu/head/src/parse.rs
index b24b6591e..56c359a0c 100644
--- a/src/uu/head/src/parse.rs
+++ b/src/uu/head/src/parse.rs
@@ -114,7 +114,13 @@ pub fn parse_num(src: &str) -> Result<(u64, bool), ParseSizeError> {
         return Err(ParseSizeError::ParseFailure(src.to_string()));
     }
 
-    parse_size(size_string).map(|n| (n, all_but_last))
+    // remove leading zeros so that size is interpreted as decimal, not octal
+    let trimmed_string = size_string.trim_start_matches('0');
+    if trimmed_string.is_empty() {
+        Ok((0, all_but_last))
+    } else {
+        parse_size(trimmed_string).map(|n| (n, all_but_last))
+    }
 }
 
 #[cfg(test)]
diff --git a/tests/by-util/test_head.rs b/tests/by-util/test_head.rs
index 571bfb3a8..0e1eafc86 100644
--- a/tests/by-util/test_head.rs
+++ b/tests/by-util/test_head.rs
@@ -189,6 +189,15 @@ fn test_no_such_file_or_directory() {
         .stderr_contains("cannot open 'no_such_file.toml' for reading: No such file or directory");
 }
 
+#[test]
+fn test_lines_leading_zeros() {
+    new_ucmd!()
+        .arg("--lines=010")
+        .pipe_in("\n\n\n\n\n\n\n\n\n\n\n\n")
+        .succeeds()
+        .stdout_is("\n\n\n\n\n\n\n\n\n\n");
+}
+
 /// Test that each non-existent files gets its own error message printed.
 #[test]
 fn test_multiple_nonexistent_files() {