Gd_carray_len returns the length of a carray field in a dirfile
#include <getdata.h> size_t gd_carray_len(DIRFILE *dirfile, const char *field_code);
The gd_carray_len() function queries a dirfile(5) database specified by dirfile and returns the number of length of the CARRAY field field_code. If field_code contains a valid representation suffix, it will be ignored.
The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).
Upon successful completion, gd_carray_len() returns the length of the field specified. 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 field specified by field_code was not found in the database.
GD_E_BAD_DIRFILE
The supplied dirfile was invalid.
GD_E_BAD_FIELD_TYPE
The field specified by field_code was not of CARRAY type.
GD_E_BAD_REPR
The representation suffix specified in field_code was not recognised.
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).