[common] Add Arduino emptyString declaration

2025-06-01 19:38:11 +02:00
parent 37f096d3b5
commit 9eae0cd253
3 changed files with 5 additions and 1 deletions
--- a/cores/common/arduino/src/wiring/wiring_compat.cpp
+++ b/cores/common/arduino/src/wiring/wiring_compat.cpp
@@ -7,3 +7,6 @@ String ipToString(const IPAddress &ip) {
 	sprintf(szRet, "%hhu.%hhu.%hhu.%hhu", ip[0], ip[1], ip[2], ip[3]);
 	return String(szRet);
 }
+
+// global empty string to allow returning const String& with nothing
+const String emptyString;
--- a/cores/common/arduino/src/wiring/wiring_compat.h
+++ b/cores/common/arduino/src/wiring/wiring_compat.h
@@ -35,6 +35,7 @@ extern "C" {

 #ifdef __cplusplus
 String ipToString(const IPAddress &ip);
+extern const String emptyString;
 #endif

 #ifdef __cplusplus