OpenDir -- RPG400-L

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Hi 
I have such prototype for opendir

d OpenDir         pr              *   ExtProc( 'opendir' ) 
d  Name                           *   Value                
d                                     Options( *String )   

d PN              c                   '/QDLS/SAGAN/'       
d Null             c                   x'00'
d PathName        S             50a 
    
Why I can open dir with this statements
c                   Eval      PathName = '/QDLS/SAGAN/' +Null
c                   Eval      dh = OpenDir( PathName )   
c                   Eval      dh = OpenDir( PN ) 
c                   Eval      dh = OpenDir( '/QDLS/SAGAN/' )

but not with this
c                   Eval      PathName = '/QDLS/SAGAN/' 
c                   Eval      dh = OpenDir( PathName )   

Shouldn't option *String put *Null after PathName?
Why this allow to do it with PN?

TIA

Marcin Sagan
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
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