gd_nvectors(3) GETDATA gd_nvectors(3)
NAME
gd_nvectors -- report the number of vector fields in a dirfile
SYNOPSIS
#include <getdata.h>
unsigned int gd_nvectors(DIRFILE *dirfile);
DESCRIPTION
The gd_nvectors() function queries a dirfile(5) database specified by dirfile and returns the number of vector fields defined in the data-
base (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).
RETURN VALUE
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).
SEE ALSO
dirfile(5), gd_open(3), gd_error(3), gd_error_string(3), gd_nfields(3), gd_nmvectors(3), gd_vector_list(3)
Version 0.7.0 16 July 2010 gd_nvectors(3)