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B.1 Get parent directory

 ; GetParent
 ; input, top of stack  (e.g. C:\Program Files\Poop)
 ; output, top of stack (replaces, with e.g. C:\Program Files)
 ; modifies no other variables.
 ;
 ; Usage:
 ;   Push "C:\Program Files\Directory\Whatever"
 ;   Call GetParent
 ;   Pop $R0
 ;   ; at this point $R0 will equal "C:\Program Files\Directory"

 Function GetParent
 
   Exch $R0
   Push $R1
   Push $R2
   Push $R3
   
   StrCpy $R1 0
   StrLen $R2 $R0
   
   loop:
     IntOp $R1 $R1 + 1
     IntCmp $R1 $R2 get 0 get
     StrCpy $R3 $R0 1 -$R1
     StrCmp $R3 "\" get
     Goto loop
   
   get:
     StrCpy $R0 $R0 -$R1
     
     Pop $R3
     Pop $R2
     Pop $R1
     Exch $R0
     
 FunctionEnd

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