NAME

       auparse_add_callback - add a callback handler for notifications

SYNOPSIS

       #include <auparse.h>

       void
       auparse_add_callback(auparse_state_t *au, auparse_callback_ptr callback,
                            void *user_data, user_destroy user_destroy_func);

DESCRIPTION

       auparse_add_callback  adds  a  callback  function  to  the parse state which is invoked to
       notify the application of parsing events. This is part of the event feed API.

       The signature of the callback is:

       void
       auparse_callback(auparse_state_t *au, auparse_cb_event_t cb_event_type,
                        void *user_data);

       When the callback is invoked it is passed:

       au
               a pointer to the parse_state

       cb_event_type
              enumerated value indicating the reason why the callback was invoked

       user_data
              pointer to user supplied private data. May be NULL.

       user_destroy_func
              pointer to function called when user_data is destroyed. May be NULL.  The signature
              is:

              void destroy(void *user_data);

              The destroy() function should be prepared to accept user_data possibly being NULL.

       The  cb_event_type  argument  indicates why the callback was invoked. It's possible values
       are:

       AUPARSE_CB_EVENT_READY
              A complete event has been parsed and is ready to be  examined.  This  is  logically
              equivalent to the parse state immediately following auparse_next_event()

       See auparse_feed(3) for a complete code example.

RETURN VALUE

       Returns the previous callback pointer.

SEE ALSO

       auparse_feed(3), auparse_flush_feed(3).

AUTHOR

       John Dennis