status.i4.v = sr_sda_file_number_c(store_numbers.i4a.r,
					   file_numbers.i4a.r, errors.i2a.r,
					   num_stores.i4.v [,sda_usage.i1a.r])

	This routine returns the current SDA file number (if any) corresponding
	to a particular store number.

	store_numbers	store number or array of store numbers
	file_numbers	returned file number or array of returned file numbers
			(a returned value of -1 indicates failure for
			 that entry)
	errors		returned ACNET status or array of status values
	num_stores	number of stores to retrieve file numbers for
	[sda_usage]	null terminated SDA usage string
			(default is SDA_DEFAULT_USAGE)

	This function returns status values as follows:

	OK			success
	DIO_MEMFAIL		memory allocation failure
	negative value		ACNET format error indicating overall failure
	positive value		number of devices in error indicating partial

	This function requires the following include files:

	cbslib_h, acnet_errors_h

	Related functions:

	sr_sda_store_number_c, sr_sda_store_times_c, sr_set_source_c,
	sr_directory_info_c, sr_file_menu_c, sr_sda_select_directory_c,
	sr_sda_set_directory_c, sr_sda_cases_present_c, sr_sda_case_times_c,

	C/C++ usage:

	static const char	sda_usage = SDA_DEFAULT_USAGE;
	short	errors[NUM_STORES];
	int	status;
	int	store_numbers[NUM_STORES] = {6000, 6001};
	int	file_numbers[NUM_STORES];
	int	num_stores = NUM_STORES;

	status = sr_sda_file_number_c(store_numbers,file_numbers,errors,