Getting the First Dataset from a Multi-Dataset Stored Procedure

I can get all the datasets with SQLCMD execution (ugly).  Is there a better programmatic way? Thanks.

CREATE TABLE #Space ( DB sysname, dbsize varchar(50), freespace varchar(50));

INSERT #Space
EXEC sp_spaceused;
/*  expecting the second dataset definition
Msg 213, Level 16, State 7, Procedure sp_spaceused, Line 128
Column name or number of supplied values does not match table definition
*/
/*
database_name	database_size	unallocated space
AdventureWorks2012	3118.38 MB	443.70 MB

reserved	data	index_size	unused
361776 KB	241704 KB	110352 KB	9720 KB
*/

Kalman Toth Database & OLAP Architect sqlusa.com
Paperback / Kindle: Pass SQL Exam 70-461 & Job Interview: Programming SQL Server 2012