From 01961ef5c64cb061b470ed6258540e880ca5a1b7 Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Mon, 10 Oct 2016 17:37:34 +0300
Subject: [PATCH] use local buffer for printf if size is equal or less than 64

---
 cores/esp32/Print.cpp | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/cores/esp32/Print.cpp b/cores/esp32/Print.cpp
index 34584c50..9f7b35da 100644
--- a/cores/esp32/Print.cpp
+++ b/cores/esp32/Print.cpp
@@ -46,13 +46,16 @@ size_t Print::write(const uint8_t *buffer, size_t size)
 
 size_t Print::printf(const char *format, ...)
 {
-    char * temp;
+    char loc_buf[64];
+    char * temp = loc_buf;
     va_list arg;
     va_start(arg, format);
     size_t len = vsnprintf(NULL, 0, format, arg);
-    temp = new char[len+1];
-    if(temp == NULL) {
-        return 0;
+    if(len > 64){
+        temp = new char[len+1];
+        if(temp == NULL) {
+            return 0;
+        }
     }
     len = vsnprintf(temp, len+1, format, arg);
     write((uint8_t*)temp, len);