gd_nmfields(3) report the number of metafields in a dirfile


#include <getdata.h>
unsigned int gd_nmfields(DIRFILE *dirfile, const char *parent);


The gd_nmfields() function queries a dirfile(5) database specified by dirfile and returns the number of metafields defined in the database for the parent field specified by parent.

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


Upon successful completion, gd_nmfields() returns the number of defined metafields for the given parent. On error, it returns zero and sets the dirfile error to a non-zero error value. Possible error values are:
The supplied parent field code was not found, or referred to a metafield itself.
The supplied dirfile was invalid.

The dirfile error may be retrieved by calling gd_error(3). A descriptive error string for the last error encountered can be obtained from a call to gd_error_string(3).