From efa55eb5b3d3a4942789bdf397c3a6d6226475d4 Mon Sep 17 00:00:00 2001
From: Daniel Friesel <daniel.friesel@uos.de>
Date: Mon, 7 Sep 2020 12:57:22 +0200
Subject: Revert "remove external libraries from main branch"

This reverts commit 0558244645611f314f47e0fa427f7323ce253eaf.
---
 include/lib/ArduinoJson/Polyfills/parseInteger.hpp | 41 ++++++++++++++++++++++
 1 file changed, 41 insertions(+)
 create mode 100644 include/lib/ArduinoJson/Polyfills/parseInteger.hpp

(limited to 'include/lib/ArduinoJson/Polyfills/parseInteger.hpp')

diff --git a/include/lib/ArduinoJson/Polyfills/parseInteger.hpp b/include/lib/ArduinoJson/Polyfills/parseInteger.hpp
new file mode 100644
index 0000000..e8f1974
--- /dev/null
+++ b/include/lib/ArduinoJson/Polyfills/parseInteger.hpp
@@ -0,0 +1,41 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2018
+// MIT License
+
+#pragma once
+
+#include <stdlib.h>
+
+#include "../Configuration.hpp"
+#include "./ctype.hpp"
+
+namespace ArduinoJson {
+namespace Internals {
+template <typename T>
+T parseInteger(const char *s) {
+  if (!s) return 0;  // NULL
+
+  if (*s == 't') return 1;  // "true"
+
+  T result = 0;
+  bool negative_result = false;
+
+  switch (*s) {
+    case '-':
+      negative_result = true;
+      s++;
+      break;
+    case '+':
+      s++;
+      break;
+  }
+
+  while (isdigit(*s)) {
+    result = T(result * 10 + T(*s - '0'));
+    s++;
+  }
+
+  return negative_result ? T(~result + 1) : result;
+}
+}
+}
-- 
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