From ec37eadb394a2aef8ccc3326611ee0b2fb3ce8c7 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis@chromium.org>
Date: Mon, 17 Jan 2022 12:17:40 -0500
Subject: [PATCH] LibCrypto: Add Formatter<SignedBigInteger>

Useful for seeing SignedBigInteger values in test failure messages.
---
 Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp | 7 +++++++
 Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h   | 5 +++++
 2 files changed, 12 insertions(+)

diff --git a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
index 59aaf1933d..0787f90eb1 100644
--- a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
+++ b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.cpp
@@ -308,3 +308,10 @@ bool SignedBigInteger::operator>=(const SignedBigInteger& other) const
 }
 
 }
+
+ErrorOr<void> AK::Formatter<Crypto::SignedBigInteger>::format(FormatBuilder& fmtbuilder, const Crypto::SignedBigInteger& value)
+{
+    if (value.is_negative())
+        TRY(fmtbuilder.put_string("-"));
+    return Formatter<Crypto::UnsignedBigInteger>::format(fmtbuilder, value.unsigned_value());
+}
diff --git a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
index f85a4969d9..9bec718794 100644
--- a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
+++ b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
@@ -143,6 +143,11 @@ struct SignedDivisionResult {
 
 }
 
+template<>
+struct AK::Formatter<Crypto::SignedBigInteger> : AK::Formatter<Crypto::UnsignedBigInteger> {
+    ErrorOr<void> format(FormatBuilder&, Crypto::SignedBigInteger const&);
+};
+
 inline Crypto::SignedBigInteger
 operator""_sbigint(const char* string, size_t length)
 {