// cpfs interface enter/exit wrappers

#define CPFS_ENTER(fmt, ...) \
    do { \
        log_info(fmt, ##__VA_ARGS__); \
        util_cpfs_enter(cpfs_); \
        cpfs_ = NULL; \
    } while (false)

#define _CPFS_RETURN(commit, retval) do { \
        util_cpfs_exit(commit, __func__); \
        return retval; \
    } while (false)

// these wrappers could be done using type-generic macros
// supported by GCC and C1x

#define CPFS_RETURN_BOOL(retval) do { \
        static_assert(std::is_same<decltype(retval), bool>::value, "retval must be bool"); \
        bool _rv_ = (retval); \
        _CPFS_RETURN(_rv_, _rv_); \
    } while (false)

#define CPFS_RETURN_FD(retval) do { \
        static_assert(std::is_same<decltype(retval), int>::value, "retval must be int"); \
        int _rv_ = (retval); \
        if (_rv_ == -1) _CPFS_RETURN(false, _rv_); \
        else { assert(fd_valid(_rv_)); _CPFS_RETURN(true, _rv_); } \
    } while (false)

#define CPFS_RETURN_SIZE(retval, count) do { \
        static_assert(std::is_same<decltype(retval), CpfsSizeRet>::value, "retval must be CpfsSizeRet"); \
        CpfsSizeRet _rv_ = (retval); \
        decltype(_rv_) _cnt_ VARATTR_UNUSED = (count); \
        if (_rv_ == -1) _CPFS_RETURN(false, _rv_); \
        else { assert(_rv_ <= _cnt_); _CPFS_RETURN(true, _rv_); } \
    } while (false)