From 6067f7dbe19be82b109142edd017448583b91e1d Mon Sep 17 00:00:00 2001
From: Xidorn Quan <me@upsuper.org>
Date: Sun, 1 Oct 2017 18:58:47 +1100
Subject: [PATCH] Avoid boundary check in parse_n_dash_digits

---
 Cargo.toml                      | 2 +-
 src/css-parsing-tests/An+B.json | 4 +++-
 src/nth.rs                      | 7 ++++---
 3 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/Cargo.toml b/Cargo.toml
index 1cbb2e73..96354cfc 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "cssparser"
-version = "0.21.2"
+version = "0.21.3"
 authors = [ "Simon Sapin <simon.sapin@exyr.org>" ]
 
 description = "Rust implementation of CSS Syntax Level 3"
diff --git a/src/css-parsing-tests/An+B.json b/src/css-parsing-tests/An+B.json
index f17849ea..b1ecf35d 100644
--- a/src/css-parsing-tests/An+B.json
+++ b/src/css-parsing-tests/An+B.json
@@ -151,6 +151,8 @@
 " +n - 1", [1, -1],
 " -n - 1", [-1, -1],
 "+ N - 1", null,
-"- N - 1", null
+"- N - 1", null,
+
+"2n\u22121", null
 
 ]
diff --git a/src/nth.rs b/src/nth.rs
index ef0adbcd..c9110cda 100644
--- a/src/nth.rs
+++ b/src/nth.rs
@@ -89,9 +89,10 @@ fn parse_signless_b<'i, 't>(input: &mut Parser<'i, 't>, a: i32, b_sign: i32) ->
 }
 
 fn parse_n_dash_digits(string: &str) -> Result<i32, ()> {
-    if string.len() >= 3
-    && string[..2].eq_ignore_ascii_case("n-")
-    && string[2..].chars().all(|c| matches!(c, '0'...'9'))
+    let bytes = string.as_bytes();
+    if bytes.len() >= 3
+    && bytes[..2].eq_ignore_ascii_case(b"n-")
+    && bytes[2..].iter().all(|&c| matches!(c, b'0'...b'9'))
     {
         Ok(parse_number_saturate(&string[1..]).unwrap())  // Include the minus sign
     } else {