gd_nframes—report the size of a Dirfile
off_t gd_nframes(DIRFILE *dirfile);
The gd_nframes() function queries a dirfile(5) database specified by dirfile and returns the number of frames in the database. Since different fields may have differing number of frames, the Dirfile Standards (see dirfile(5)) dictate that the number of frames in the database is defined to be equal to the number of frames in the reference field defined by the /REFERENCE directive (see dirfile-format(5)) or, if no such reference field is defined, by the first raw field specified in the format specification.
If no vector fields are defined in the database, gd_nframes() returns zero and succeeds.
The dirfile argument must point to a valid DIRFILE object previously created by a call to gd_open(3).
Upon successful completion, gd_nframes() returns the number of frames in the dirfile, which is never negative. On error, it returns a negative-valued error code. Possible error codes are:
The error code is also stored in the DIRFILE object and may be retrieved after this function returns by calling gd_error(3). A descriptive error string for the error may be obtained by calling gd_error_string(3).
The get_nframes() function appeared in GetData-0.3.0.
In GeData-0.7.0, this function was renamed to gd_nframes().
dirfile(5), dirfile-encoding(5), gd_open(3), gd_bof(3), gd_eof(3), gd_error(3), gd_error_string(3)