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ArduinoStringAdapter.hpp
00001 // ArduinoJson - arduinojson.org 00002 // Copyright Benoit Blanchon 2014-2021 00003 // MIT License 00004 00005 #pragma once 00006 00007 #include <Arduino.h> 00008 00009 #include <ArduinoJson/Polyfills/safe_strcmp.hpp> 00010 #include <ArduinoJson/Strings/IsString.hpp> 00011 #include <ArduinoJson/Strings/StoragePolicy.hpp> 00012 00013 namespace ARDUINOJSON_NAMESPACE { 00014 00015 class ArduinoStringAdapter { 00016 public: 00017 ArduinoStringAdapter(const ::String& str) : _str(&str) {} 00018 00019 void copyTo(char* p, size_t n) const { 00020 memcpy(p, _str->c_str(), n); 00021 } 00022 00023 bool isNull() const { 00024 // Arduino's String::c_str() can return NULL 00025 return !_str->c_str(); 00026 } 00027 00028 int compare(const char* other) const { 00029 // Arduino's String::c_str() can return NULL 00030 const char* me = _str->c_str(); 00031 return safe_strcmp(me, other); 00032 } 00033 00034 bool equals(const char* expected) const { 00035 return compare(expected) == 0; 00036 } 00037 00038 size_t size() const { 00039 return _str->length(); 00040 } 00041 00042 const char* begin() const { 00043 return _str->c_str(); 00044 } 00045 00046 typedef storage_policies::store_by_copy storage_policy; 00047 00048 private: 00049 const ::String* _str; 00050 }; 00051 00052 template <> 00053 struct IsString< ::String> : true_type {}; 00054 00055 template <> 00056 struct IsString< ::StringSumHelper> : true_type {}; 00057 00058 inline ArduinoStringAdapter adaptString(const ::String& str) { 00059 return ArduinoStringAdapter(str); 00060 } 00061 00062 } // namespace ARDUINOJSON_NAMESPACE
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