[ex] throw exceptions during basic pcsc

Ex.cpp

@@ -8,6 +8,10 @@ Ex::Ex(const char* msg) {
     this->msg = std::string(msg);
 }
 
+Ex::Ex(const std::string& msg) {
+    this->msg = msg;
+}
+
 /*
 Ex::Ex(const char* msg, int n) {
     this->msg = std::string(msg) + ": " + strerror(n);

Ex.h

@@ -11,7 +11,7 @@ class Ex {
     public:
         explicit Ex();
         explicit Ex(const char* msg);
-        explicit Ex(const char* msg, int errn);
+        explicit Ex(const std::string& msg);
         friend std::ostream& operator<<(std::ostream&, const Ex&);
 };
 

read_dati_personali.cpp

@@ -1,11 +1,18 @@
 #include "read_dati_personali.h"
 
-#define CHECK(f, rv) \
- if (SCARD_S_SUCCESS != rv) \
- { \
-  printf("[E] " f ": %s\n", pcsc_stringify_error(rv)); \
-  return -1; \
- }
+/*
+``
+    pcsc_stringify_error()
+        The returned string uses a Thread-Local Storage (TLS) buffer and is valid: [...]
+            only while the thread on which it was obtained is alive.
+''
+ */
+#define CHECK(what, rv) \
+if (rv != SCARD_S_SUCCESS) { \
+    char message[256]; \
+    sprintf(message, what ": %s\n", pcsc_stringify_error(rv)); \
+    throw ExPCSC(message); \
+}
 
 int read_dati_personali_c(char** output_buffer, size_t* len) {
     LONG rv;

read_dati_personali.h

@@ -5,8 +5,12 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <string>
+
 #include <winscard.h>
 
+#include "Ex.h"
+
 int read_dati_personali_c(char** output_buffer, size_t* len);
 
 #endif