get_nfields (3) - Linux Manuals

get_nfields: report the number of fields in a dirfile


get_nfields --- report the number of fields in a dirfile


#include <getdata.h>
unsigned int get_nfields(DIRFILE *dirfile);


The get_nfields() function queries a dirfile(5) database specified by dirfile and returns the number of fields defined in the database. Notably, this count does not include /META fields.

The dirfile argument must point to a valid DIRFILE object previously created by a call to dirfile_open(3).


Upon successful completion, get_nfields() returns the number of defined fields in the dirfile. On error, it returns zero and sets the dirfile error to a non-zero error value. Possible error values are:
The supplied dirfile was invalid. The dirfile error may be retrieved by calling get_error(3). A descriptive error string for the last error encountered can be obtained from a call to get_error_string(3).