gd_nvectors (3)

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

The gd_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 gd_open(3).

Upon successful completion, gd_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 gd_error(3). A descriptive error string for the last error encountered can be obtained from a call to gd_error_string(3).

dirfile(5), gd_open(3), gd_error(3), gd_error_string(3), gd_nfields(3), gd_nmvectors(3), gd_vector_list(3)