gd_hidden — check whether a Dirfile entry is hidden or not

       The  gd_hidden()  function  queries  a  dirfile(5) database specified by dirfile to determine whether the
       field or alias called entry_name is hidden or not.  This information is also available in the  entry  ob‐
       ject proved by gd_entry(3).

       By  default,  a  hidden entry does not appear in the lists returned by the functions gd_match_entries(3),
       gd_entry_list(3)  gd_constants(3),   or   gd_strings(3),   including   the   special-case   versions   of
       gd_entry_list(3)  such as gd_field_list(3).  These omissions are also reflected in the counts returned by
       the corresponding field counting function gd_nentries(3) and it's special-case  versions  (gd_nfields(3),
       &c.).

       The gd_hidden() function appeared in GetData-0.8.0.

       In GetData-0.10.0, the error return from this function changed from -1 to a negative-valued error code.

       gd_hidden — check whether a Dirfile entry is hidden or not

       Upon successful completion, gd_hidden() returns one if the field or alias is hidden, or zero if the entry
       is not hidden.

       On  error, it returns a negative-valued error code.  (As a result, the caller checking simply whether the
       return value of this function is non-zero is usually an error.)  Possible error codes are:

       GD_E_BAD_CODE
               The field specified by field_code was not found in the database.

       GD_E_BAD_DIRFILE
               The supplied dirfile was invalid.

       The error code is also stored in the DIRFILE object and may be retrieved after this function  returns  by
       calling   gd_error(3).    A   descriptive  error  string  for  the  error  may  be  obtained  by  calling
       gd_error_string(3).

gd_entry(3), gd_field_list(3), gd_hide(3), gd_nfields(3), gd_open(3), gd_unhide(3), dirfile(5)

Version 0.10.0                                  25 December 2016                                    gd_hidden(3)

#include<getdata.h>intgd_hidden(constDIRFILE*dirfile,constchar*entry_name);