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Hi, The manual says that `gpgme_data_identify()` takes one argument, the `gpgme_data_t object`, but in practice it actually has a second parameter which is reserved and presumably should be set to zero for now like for other reserved function parameters. This should probably be fixed in the documentation, but I suppose the prototype could be fixed as well. In the meantime, here's a code snippet I'm using which allows portability to either prototype in an application (believe it or not, there's no undefined behavior here). ``` static gpgme_data_type_t (*const gpgme_data_identify_ptr)() = (gpgme_data_type_t (*)())(gpgme_data_identify); #define gpgme_data_identify(X) _Generic((gpgme_data_identify), \ gpgme_data_type_t (*)(gpgme_data_t): gpgme_data_identify_ptr(X), \ gpgme_data_type_t (*)(gpgme_data_t, int): gpgme_data_identify_ptr(X, 0)) ```

Hi, The manual says that `gpgme_data_identify()` takes one argument, the `gpgme_data_t object`, but in practice it actually has a second parameter which is reserved and presumably should be set to zero for now like for other reserved function parameters. This should probably be fixed in the documentation, but I suppose the prototype could be fixed as well. In the meantime, here's a code snippet I'm using which allows portability to either prototype in an application in standard C11. ``` #define gpgme_data_identify(X) _Generic(gpgme_data_identify, \ gpgme_data_type_t (*)(gpgme_data_t): ((gpgme_data_type_t (*)(gpgme_data_t))gpgme_data_identify)(X), \ gpgme_data_type_t (*)(gpgme_data_t, int): ((gpgme_data_type_t (*)(gpgme_data_t, int))gpgme_data_identify)(X, 0)) ```

Hi, The manual says that `gpgme_data_identify()` takes one argument, the `gpgme_data_t object`, but in practice it actually has a second parameter which is reserved and presumably should be set to zero for now like for other reserved function parameters. This should probably be fixed in the documentation, but I suppose the prototype could be fixed as well. In the meantime, here's a code snippet I'm using which allows portability to either prototype in an application (believe it or not, there's no undefined behavior here)in standard C11. ``` static gpgme_data_type_t (*const gpgme_data_identify_ptr)() = (gpgme_data_type_t (*)())(gpgme_data_identify); #define gpgme_data_identify(X) _Generic((gpgme_data_identify)#define gpgme_data_identify(X) _Generic(gpgme_data_identify, \ gpgme_data_type_t (*)(gpgme_data_t): ((gpgme_data_identify_ptr(Xtype_t (*)(gpgme_data_t))gpgme_data_identify)(X), \ gpgme_data_type_t (*)(gpgme_data_t, int): ((gpgme_data_identify_ptr(X_type_t (*)(gpgme_data_t, int))gpgme_data_identify)(X, 0)) ```