Generation of unique temporary filename (AHGgettempfilename)

The `AHGgettempfilename` macro loops until it finds a filename that does not physically exist on disk (checked via the `fileExist` function). It constructs the name using a prefix and a random part derived from the `normal(0)` function. The result is dynamically stored in the macro variable whose name is passed as a parameter.

Data Analysis

Type : INTERNAL_CREATION

No external data is read. The script generates character strings (filenames) algorithmically.

1 Code Block

MACRO

Explanation :
Macro definition. It uses a `%do %until` loop coupled with `%sysfunc(fileExist(...))` to ensure file uniqueness. The target variable (passed by reference via `tempname`) is updated at each iteration with a new candidate containing a random string.

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1	%macro AHGgettempfilename(tempname,dir=%AHGtempdir,start=&tempname,ext=txt);
2	%local rdn ;
3	%DO %until (not %sysfunc(fileExist(&&&tempName)) );
4	%let rdn=%sysfunc(normal(0));
5	%let rdn=%sysfunc(translate(&rdn,00,.-));
6	%let &tempname=T_&start.._%substr(&rdn,1,5).&ext;
7	%END;
8	%put &tempname=&&&tempname;
9	%mend;

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