From 3c6bf0a7a354fcda3cac09e395f1fced9e2d96df Mon Sep 17 00:00:00 2001
From: Maximilian Gerhardt <maximilian.gerhardt@rub.de>
Date: Tue, 6 May 2025 04:34:09 +0200
Subject: [PATCH] Print number as 0 '0' instead of empty string (#189)

Fixes https://github.com/openwch/arduino_core_ch32/issues/185
---
 cores/arduino/Print.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cores/arduino/Print.cpp b/cores/arduino/Print.cpp
index 24ec039..41a3443 100644
--- a/cores/arduino/Print.cpp
+++ b/cores/arduino/Print.cpp
@@ -356,6 +356,12 @@ size_t Print::printULLNumber(unsigned long long n64, uint8_t base)
   uint8_t i = 0;
   uint8_t innerLoops = 0;
 
+  // Special case workaround https://github.com/arduino/ArduinoCore-API/issues/178
+  if (n64 == 0) {
+    write('0');
+    return 1;
+  }
+
   // prevent crash if called with base == 1
   if (base < 2) {
     base = 10;