Added tests for Flash strings (closes #1070)

test/MixedConfiguration/progmem_emulation.hpp

@@ -0,0 +1,41 @@
+// ArduinoJson - arduinojson.org
+// Copyright Benoit Blanchon 2014-2019
+// MIT License
+
+#include <stdint.h>  // uint8_t
+#include <string.h>  // strcmp, strlen...
+
+class __FlashStringHelper;
+
+typedef char prog_char;
+typedef void prog_void;
+
+inline const void* convertPtrToFlash(const void* s) {
+  return reinterpret_cast<const char*>(s) + 42;
+}
+
+inline const void* convertFlashToPtr(const void* s) {
+  return reinterpret_cast<const char*>(s) - 42;
+}
+
+#define F(X) reinterpret_cast<const __FlashStringHelper*>(convertPtrToFlash(X))
+
+inline uint8_t pgm_read_byte_near(const void* p) {
+  return *reinterpret_cast<const uint8_t*>(convertFlashToPtr(p));
+}
+
+inline void* memcpy_P(void* a, const prog_void* b, size_t n) {
+  return memcpy(a, convertFlashToPtr(b), n);
+}
+
+inline int strcmp_P(const char* a, const prog_char* b) {
+  return strcmp(a, reinterpret_cast<const char*>(convertFlashToPtr(b)));
+}
+
+inline int strncmp_P(const char* a, const prog_char* b, size_t n) {
+  return strncmp(a, reinterpret_cast<const char*>(convertFlashToPtr(b)), n);
+}
+
+inline size_t strlen_P(const prog_char* s) {
+  return strlen(reinterpret_cast<const char*>(convertFlashToPtr(s)));
+}