status.i4.v = snp_set_sda_info_c(sda_usage_text.i1a.r, sda_file.i4.v,
					 sda_case.i4.v, sda_subcase.i4.v)

	This function allows the calling program to set the SDA data
	acquisition information for the Snapshot Plot interface.  This
	information can also be entered by the user through the plot

	sda_usage_text	null terminated SDA usage string
			(SDA_USAGE_NAME_LEN characters)
			(If a value of NULL or a null string is passed for
			 this argument, the usage will be set to Collider shot.)
	sda_file	file number
	sda_case	case number
	sda_subcase	subcase number

	This function returns status values as follows:

	OK			success
	CLIB_NOTENB		plot interface is not in SDA mode
	CLIB_NO_SUCH		no such SDA usage or case number
	CLIB_MEMFAIL		dynamic memory allocation failure
	SQL_xxx			error reading database

	This function requires the following include files:

	clib_h, acnet_errors_h

	Related functions:

	snpplt, snp_setup, snp_start, snp_file_menu_c, snp_start_plot_c,
	snp_start_plot_from_file_c, snp_read_plot_setup_file_c,
	snp_export_data, fstplt, ftp_setup, ftp_start,
	ftp_file_menu_c, ftp_start_plot_c, ftp_start_plot_from_file_c,
	ftp_read_plot_setup_file_c, ftp_calculated_trace_c

	C/C++ usage:

	static  char	sda_usage_text[] = SDA_DEFAULT_USAGE;
	int	status;
	int	sda_file = FILE_NUMBER;
	int	sda_case = SDA_DEFAULT_CASE_NUMBER;
	int	sda_subcase = SDA_DEFAULT_SUBCASE_NUMBER;

	status = snp_set_sda_info_c(sda_usage_text,sda_file,sda_case,