get_nmfields(3)
NAME
get_nmfields — report the number of metafields in a dirfile
SYNOPSIS
#include <getdata.h>
unsigned int get_nmfields(DIRFILE *dirfile, const char *parent);
DESCRIPTION
get_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 dirfile_open(3).
RETURN VALUE
Upon successful completion, get_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:
GD_E_BAD_CODE- The supplied parent field code was not found, or referred to a metafield itself.
GD_E_BAD_DIRFILE- 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 toget_error_string(3).
SEE ALSO
dirfile(5), dirfile_open(3), get_error(3), get_error_string(3), get_mfield_list(3), get_nfields(3), get_nmfields_by_type(3), get_nmvectors(3)