Provided by:
libgetdata-dev_0.7.3-6_i386 
NAME
gd_nframes -- report the size of a dirfile
SYNOPSIS
#include <getdata.h>
off_t gd_nframes(DIRFILE *dirfile);
DESCRIPTION
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).
RETURN VALUE
Upon successful completion, gd_nframes() returns the number of frames
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.
GD_E_RAW_IO
An attempt to stat(2) the file associated with the reference
field failed.
GD_E_UNKNOWN_ENCODING
The size of the decoded data file associated with the reference
field could not be not be determined because its encoding was
not understood.
GD_E_UNSUPPORTED
The size of the decoded data file associated with the reference
field could not be not be determined because its encoding was
not supported.
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), dirfile-encoding(5), gd_open(3), gd_bof(3), gd_eof(3),
gd_error(3), gd_error_string(3)