From 7207276697de0fb1886737aee373d9172e3901ec Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 18 May 2020 15:07:37 +0200
Subject: [PATCH] AK: Make Utf32View::substring_view() with 0 length not crash

Just make it hand out a zero-length Utf32View :^)
---
 AK/Utf32View.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/AK/Utf32View.h b/AK/Utf32View.h
index f75125a8e7b..89c0eefcead 100644
--- a/AK/Utf32View.h
+++ b/AK/Utf32View.h
@@ -34,6 +34,7 @@ namespace AK {
 
 class Utf32View {
 public:
+    Utf32View() { }
     Utf32View(const u32* codepoints, size_t length)
         : m_codepoints(codepoints)
         , m_length(length)
@@ -46,6 +47,8 @@ public:
 
     Utf32View substring_view(size_t offset, size_t length) const
     {
+        if (length == 0)
+            return {};
         ASSERT(offset < m_length);
         ASSERT(!Checked<size_t>::addition_would_overflow(offset, length));
         ASSERT((offset + length) <= m_length);