get_nvectors (3) Linux Manual Page
NAME
get_nvectors — report the number of vector fields in a dirfile
SYNOPSIS
#include <getdata.h>
-
unsigned int get_nvectors(DIRFILE *dirfile);
DESCRIPTION
get_nvectors() function queries a dirfile(5) database specified by dirfile and returns the number of vector fields defined in the database (i.e. fields of types BIT,~LINCOM,~LINTERP,~MULTIPLY,~PHASE,~POLYNOM,~RAW, SBIT). 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).
RETURN VALUE
Upon successful completion, get_nvectors() returns the number of vector fields in the dirfile. On error, it returns zero and sets the dirfile error to a non-zero error value. Possible error values are:
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), getdata(3), get_error(3), get_error_string(3), get_nfields(3), get_nmvectors(3), get_vector_list(3)