From 97cea9e61cbd88705d1ac573039659079b2fe356 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Sun, 12 Jul 2020 13:36:48 -0400
Subject: [PATCH] AK: Give String::index_of() an optional second "start"
 argument

---
 AK/String.cpp | 4 ++--
 AK/String.h   | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/AK/String.cpp b/AK/String.cpp
index 0a2a05d13ba..bcb10d2d793 100644
--- a/AK/String.cpp
+++ b/AK/String.cpp
@@ -311,13 +311,13 @@ bool String::contains(const String& needle) const
     return strstr(characters(), needle.characters());
 }
 
-Optional<size_t> String::index_of(const String& needle) const
+Optional<size_t> String::index_of(const String& needle, size_t start) const
 {
     if (is_null() || needle.is_null())
         return {};
 
     const char* self_characters = characters();
-    const char* result = strstr(self_characters, needle.characters());
+    const char* result = strstr(self_characters + start, needle.characters());
     if (!result)
         return {};
     return Optional<size_t> { result - self_characters };
diff --git a/AK/String.h b/AK/String.h
index 9432c18de68..ac107f1016a 100644
--- a/AK/String.h
+++ b/AK/String.h
@@ -124,7 +124,7 @@ public:
     bool equals_ignoring_case(const StringView&) const;
 
     bool contains(const String&) const;
-    Optional<size_t> index_of(const String&) const;
+    Optional<size_t> index_of(const String&, size_t start = 0) const;
 
     Vector<String> split_limit(char separator, size_t limit, bool keep_empty = false) const;
     Vector<String> split(char separator, bool keep_empty = false) const;