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libraries/Antares_ESP8266_MQTT/src/ArduinoJson/Polyfills/isFloat.hpp

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+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2017
+// MIT License
+
+#pragma once
+
+#include <string.h>  // for strcmp
+#include "./ctype.hpp"
+
+namespace ArduinoJson {
+namespace Polyfills {
+
+inline bool isFloat(const char* s) {
+  if (!s) return false;
+
+  if (!strcmp(s, "NaN")) return true;
+  if (issign(*s)) s++;
+  if (!strcmp(s, "Infinity")) return true;
+  if (*s == '\0') return false;
+
+  while (isdigit(*s)) s++;
+
+  if (*s == '.') {
+    s++;
+    while (isdigit(*s)) s++;
+  }
+
+  if (*s == 'e' || *s == 'E') {
+    s++;
+    if (issign(*s)) s++;
+    if (!isdigit(*s)) return false;
+    while (isdigit(*s)) s++;
+  }
+
+  return *s == '\0';
+}
+}
+}