Macro XSET (from Fraktal SAS Programming)

This Macro transfers the environment from the particular operating system to SAS Macro variables.

• Characters "not appreciated" by SAS are removed from variable values.
• If a specific variable name is supplied, this will be the only one transferred.

Code executed	Function performed
%MACRO xset(xvar);	Start Macro definition with name and positional parameter xvar
filename path pipe "set" lrecl = 2048;	Open source for text data of type pipe pointing to OS command
data _NULL_;	Start datastep run group
length xvar $256 xval $1024;	Declare variables xvar and xval by length in bytes
infile path dlm = '=';	Utilize data stream from data source path
input xvar $ xval $;	Define structure of data stream path with variables xvar and xval
xvar = upcase(translate(xvar,'_','(-)'));	Remove unwanted characters from variable xvar
%IF %LENGTH(&XVAR.) != 0 %THEN %DO;	Specify condition on macro parameter xvar for using code segment
if trim(xvar) = "%UPCASE(&XVAR.)";	Conditionally executed code
%END;	End condition on macro parameter xvar
call symput(compress(xvar),compress(xval));	Transfer variable values to symbol table
run;	End data step run group
filename path clear;	Close source for text data
%MEND xset;	End Macro definition with name