Set Extension

Author: TrueparuEx (talk, contrib)

Description

Simple function to set / change file extension.

Usage

  Push ".exe"
  Push "C:\some dir\some file.txt"
  Call SetExtension
  Pop $R0       ; $R0 = "C:\some dir\some file.exe"

Function

Function SetExtension
  Exch $R0
  Exch
  Exch $R1
  Push $R2
  Push $R3
 
  StrCpy $R3 0
 
  trim_loop:
  IntOp $R3 $R3 + 1
   StrCpy $R2 $R0 1 -$R3
    StrCmp $R2 "\" trim_add
    StrCmp $R2 "/" trim_add
    StrCmp $R2 "" trim_add
 
   StrCmp $R2 "." 0 trim_loop
    StrCpy $R2 $R0 "" -$R3
    StrCmp $R2 $R1 trim_ok
     StrCpy $R2 $R0 -$R3
     StrCpy $R0 "$R2$R1"
     goto trim_ok
 
  trim_add:
  StrCpy $R0 "$R0$R1"
  trim_ok:
 
  Pop $R3
  Pop $R2
  Pop $R1
  Exch $R0
FunctionEnd