[CIFIX]add extern 'C' in C++ code

sdk/include/event.h

@@ -1,3 +1,9 @@
+#pragma once
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
 
 struct stellar_session_event_data;
 
@@ -10,3 +16,6 @@ struct stellar_event
     };
 };
 
+#ifdef __cpluscplus
+}
+#endif

sdk/include/http.h

@@ -1,5 +1,14 @@
 #pragma once
 
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
 #include "session.h"
 
-void http_decoder(const struct stellar_session *s, enum session_event_type event, struct stellar_packet *p, const char *payload, uint16_t len, void **pme);
+void http_decoder(const struct stellar_session *s, enum session_event_type event, struct stellar_packet *p, const char *payload, uint16_t len, void **pme);
+
+#ifdef __cpluscplus
+}
+#endif

sdk/include/logger.h

@@ -10,10 +10,19 @@
 
 #pragma once
 
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
 #define log_debug(x, ...)
 
 #define log_info(x, ...)
 
 #define log_notice(x, ...)
 
-#define log_error(x, ...) 
+#define log_error(x, ...)
+
+#ifdef __cpluscplus
+}
+#endif

sdk/include/util_errors.h

@@ -8,6 +8,13 @@
 ***********************************************************************************************
 */
 
+#pragma once
+
+#ifdef __cpluscplus
+extern "C"
+{
+#endif
+
 #define CASE_CODE(E)  case E: return #E
 
 /* ST is short for stellar */
@@ -35,4 +42,8 @@ typedef enum {
     ST_ERR_FOPEN,
     ST_ERR_BPF,
     ST_ERR_MAX
-} error_code_t;
+} error_code_t;
+
+#ifdef __cpluscplus
+}
+#endif