common: add a status code for internal errors

common/include/ivy/status.h

@@ -10,6 +10,7 @@ enum ivy_status {
 	IVY_ERR_BAD_SYNTAX = -3,
 	IVY_ERR_NO_MEMORY = -4,
 	IVY_ERR_NOT_SUPPORTED = -5,
+	IVY_ERR_INTERNAL_FAILURE = -6,
 };
 
 IVY_API const char *ivy_status_to_string(enum ivy_status status);

common/status.c

@@ -13,6 +13,7 @@ const char *ivy_status_to_string(enum ivy_status status)
 		ENUM_STR(IVY_ERR_BAD_SYNTAX);
 		ENUM_STR(IVY_ERR_NO_MEMORY);
 		ENUM_STR(IVY_ERR_NOT_SUPPORTED);
+		ENUM_STR(IVY_ERR_INTERNAL_FAILURE);
 	default:
 		return "";
 	}