NAME

       gd_spf — returns the samples per frame for a field in a dirfile

SYNOPSIS

       #include <getdata.h>

       gd_spf_t gd_spf(DIRFILE *dirfile, const char *field_code);

DESCRIPTION

       The  gd_spf()  function queries a dirfile(5) database specified by dirfile and returns the
       number of samples per frame for the field field_code.   If  field_code  contains  a  valid
       representation  suffix,  it  will  be  ignored.   The  gd_spf_t type is an unsigned 16-bit
       integer type.

       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_spf() returns the number of samples per frame for 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_REPR
               The representation suffix specified in field_code was not recognised.

       GD_E_DIMENSION
               A scalar field was found where a vector field was expected.

       GD_E_INTERNAL_ERROR
               An  internal error occurred in the library while trying to perform the task.  This
               indicates a bug in the library.  Please report the incident to the maintainer.

       GD_E_RECURSE_LEVEL
               Too many levels of recursion were encountered while trying to resolve  field_code.
               This  usually  indicates  a  circular  dependency  in  field  specification in the
               dirfile.

       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)