vdata_id	IN:	Vdata identifier returned by VSattach
	action	IN:	Action to be performed
	fields_in_buf	IN:	Names of the fields in buf
	buf	IN/OUT:	Buffer containing the values of the packed fields to write to or read from the vdata
	buf_size	IN:	Buffer size in bytes
	n_records	IN:	Number of records to pack or unpack
	field_name_list	IN:	Names of the fields to be packed or unpacked
	bufptrs	IN/OUT:	Array of pointers to the field buffers

	Purpose	Packs field data into a buffer or unpacks buffered field data into vdata field(s) for fully interlaced fields.
	Return value	Returns SUCCEED (or 0) if successful and FAIL (or -1) otherwise.
	Description	VSfpack packs or unpacks the field(s) listed in the parameter field_name_list to or from the buffer buf according to the specified action in the parameter action.
		Valid values for action are _HDF_VSPACK (or 0) which packs field values from bufptrs (the field buffers) to buf, or _HDF_VSUNPACK (or 1) which unpacks vdata field values from buf into bufptrs.
		When VSfpack is called to pack field values into buf, fields_in_buf must list all fields of the vdata. When VSfpack is called to unpack field values, fields_in_buf may be a subset of the vdata fields. To specify all vdata fields in fields_in_buf, NULL can be used in C and a blank character (" ") in Fortran.
		The name(s) of the field(s) to be packed or unpacked are specified by the field_name_list. In C, the names in the parameter field_name_list can be a subset of or all field names listed in fields_in_buf. To specify all vdata fields, NULL can be used in C.
		The FORTRAN-77 versions of this routine can pack or unpack only one field at a time. Therefore, field_name_list will contain the name of the field that will be packed or unpacked.
		The calling program must allocate sufficient space for buf to hold all of the packed fields. The size of the buf buffer should be at least n_records * (the total size of all fields specified in fields_in_buf).
		Note that there are two FORTRAN-77 versions of this routine: vsfnpak to pack or unpack a numeric field and vsfcpak to pack or unpack a character field.
		Refer to the HDF User's Guide for an example on how to use this routine.

	FORTRAN	integer function vsfnpak(vdata_id, action, fields_in_buf, buf, buf_size, n_records, field_name_list, bufptrs)
		integer vdata_id, action, buf(*), buf_size, n_records
		character*(*) fields_in_buf, field_name_list
		<valid numeric data type> bufptrs(*)
		integer function vsfcpak(vdata_id, action, fields_in_buf, buf, buf_size, n_records, field_name_list, bufptrs)
		integer vdata_id, action, buf(*), buf_size, n_records
		character*(*) fields_in_buf, field_name_list, bufptrs(*)