StrStr: Difference between revisions

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== Description ==
== Description ==


'''Requires:''' [[LogicLib]].
'''Version:''' 2.0.1.
 
'''Version:''' 2.0.


This function searches for a substring on a string, and returns itself plus the remaining part of the string on the right of the substring.
This function searches for a substring on a string, and returns itself plus the remaining part of the string on the right of the substring.
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<highlight-nsis>
<highlight-nsis>
${StrLoc} "ResultVar" "String" "SubString"
${StrStr} "ResultVar" "String" "SubString"
</highlight-nsis>
</highlight-nsis>
or
or
<highlight-nsis>
<highlight-nsis>
Push "String"
Push "SubString"
Push "SubString"
Push "String"
Call StrStr
Call StrLoc
Pop "ResultVar"
Pop "ResultVar"
</highlight-nsis>
</highlight-nsis>
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</highlight-nsis>
</highlight-nsis>


== Function Code ==
== Function Code (requires [[LogicLib header file]]) ==


<highlight-nsis>
<highlight-nsis>
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!macro StrStr ResultVar String SubString
!macro StrStr ResultVar String SubString
   Push "${SubString}"
   Push `${String}`
   Push "${String}"
   Push `${SubString}`
   Call StrStr
   Call StrStr
   Pop "${ResultVar}"
   Pop `${ResultVar}`
!macroend
!macroend


Line 94: Line 92:
/*After this point:
/*After this point:
   ------------------------------------------
   ------------------------------------------
   $R0 = OutVar (output)*/
   $R0 = ResultVar (output)*/


   ;Remove part before "SubString" on "String" (if there has one)
   ;Remove part before "SubString" on "String" (if there has one)
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FunctionEnd
FunctionEnd
</highlight-nsis>
</highlight-nsis>
== Function Code (does not require [[LogicLib header file]]) ==
<highlight-nsis>
!define StrStr "!insertmacro StrStr"
!macro StrStr ResultVar String SubString
  Push `${String}`
  Push `${SubString}`
  Call StrStr
  Pop `${ResultVar}`
!macroend
Function StrStr
/*After this point:
  ------------------------------------------
  $R0 = SubString (input)
  $R1 = String (input)
  $R2 = SubStringLen (temp)
  $R3 = StrLen (temp)
  $R4 = StartCharPos (temp)
  $R5 = TempStr (temp)*/
  ;Get input from user
  Exch $R0
  Exch
  Exch $R1
  Push $R2
  Push $R3
  Push $R4
  Push $R5
  ;Get "String" and "SubString" length
  StrLen $R2 $R0
  StrLen $R3 $R1
  ;Start "StartCharPos" counter
  StrCpy $R4 0
  ;Loop until "SubString" is found or "String" reaches its end
  loop:
    ;Remove everything before and after the searched part ("TempStr")
    StrCpy $R5 $R1 $R2 $R4
    ;Compare "TempStr" with "SubString"
    StrCmp $R5 $R0 done
    ;If not "SubString", this could be "String"'s end
    IntCmp $R4 $R3 done 0 done
    ;If not, continue the loop
    IntOp $R4 $R4 + 1
    Goto loop
  done:
/*After this point:
  ------------------------------------------
  $R0 = ResultVar (output)*/
  ;Remove part before "SubString" on "String" (if there has one)
  StrCpy $R0 $R1 `` $R4
  ;Return output to user
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Exch $R0
FunctionEnd
</highlight-nsis>
== Versions History ==
;2.0.1
:Added support for Unicode strings (not tested by the author).


== Credits ==
== Credits ==
Version 2.0 - Diego Pedroso ([[User:deguix|deguix]]).<br>
Version 2.x - Diego Pedroso ([[User:deguix|deguix]]).<br>
Version 1.0 - Ximon Eighteen ([[User:sunjammer|sunjammer]]).
Version 1.x - [[User:mgentry|mgentry]] / Amir Szekely ([[User:kichik|kichik]]) / Ximon Eighteen ([[User:sunjammer|sunjammer]]) / Diego Pedroso ([[User:deguix|deguix]]).


[[Category:String Functions]]
[[Category:String Functions]]

Latest revision as of 06:23, 3 December 2005

Author: deguix (talk, contrib)


Description

Version: 2.0.1.

This function searches for a substring on a string, and returns itself plus the remaining part of the string on the right of the substring.

How To Use

Syntax

${StrStr} "ResultVar" "String" "SubString"

or

Push "String"
Push "SubString"
Call StrStr
Pop "ResultVar"

Parameters

ResultVar
Variable where the part on the right and including the SubString found on String is returned. If SubString is not found, an empty value is returned.
String
String where to search for SubString.
SubString
String to search in String.

Example

${StrStr} $0 "This is just an example" "just"
;$0 = "just an example"

Function Code (requires LogicLib header file)

!define StrStr "!insertmacro StrStr"
 
!macro StrStr ResultVar String SubString
  Push `${String}`
  Push `${SubString}`
  Call StrStr
  Pop `${ResultVar}`
!macroend
 
Function StrStr
/*After this point:
  ------------------------------------------
  $R0 = SubString (input)
  $R1 = String (input)
  $R2 = SubStringLen (temp)
  $R3 = StrLen (temp)
  $R4 = StartCharPos (temp)
  $R5 = TempStr (temp)*/
 
  ;Get input from user
  Exch $R0
  Exch
  Exch $R1
  Push $R2
  Push $R3
  Push $R4
  Push $R5
 
  ;Get "String" and "SubString" length
  StrLen $R2 $R0
  StrLen $R3 $R1
  ;Start "StartCharPos" counter
  StrCpy $R4 0
 
  ;Loop until "SubString" is found or "String" reaches its end
  ${Do}
    ;Remove everything before and after the searched part ("TempStr")
    StrCpy $R5 $R1 $R2 $R4
 
    ;Compare "TempStr" with "SubString"
    ${IfThen} $R5 == $R0 ${|} ${ExitDo} ${|}
    ;If not "SubString", this could be "String"'s end
    ${IfThen} $R4 >= $R3 ${|} ${ExitDo} ${|}
    ;If not, continue the loop
    IntOp $R4 $R4 + 1
  ${Loop}
 
/*After this point:
  ------------------------------------------
  $R0 = ResultVar (output)*/
 
  ;Remove part before "SubString" on "String" (if there has one)
  StrCpy $R0 $R1 `` $R4
 
  ;Return output to user
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Exch $R0
FunctionEnd

Function Code (does not require LogicLib header file)

!define StrStr "!insertmacro StrStr"
 
!macro StrStr ResultVar String SubString
  Push `${String}`
  Push `${SubString}`
  Call StrStr
  Pop `${ResultVar}`
!macroend
 
Function StrStr
/*After this point:
  ------------------------------------------
  $R0 = SubString (input)
  $R1 = String (input)
  $R2 = SubStringLen (temp)
  $R3 = StrLen (temp)
  $R4 = StartCharPos (temp)
  $R5 = TempStr (temp)*/
 
  ;Get input from user
  Exch $R0
  Exch
  Exch $R1
  Push $R2
  Push $R3
  Push $R4
  Push $R5
 
  ;Get "String" and "SubString" length
  StrLen $R2 $R0
  StrLen $R3 $R1
  ;Start "StartCharPos" counter
  StrCpy $R4 0
 
  ;Loop until "SubString" is found or "String" reaches its end
  loop:
    ;Remove everything before and after the searched part ("TempStr")
    StrCpy $R5 $R1 $R2 $R4
 
    ;Compare "TempStr" with "SubString"
    StrCmp $R5 $R0 done
    ;If not "SubString", this could be "String"'s end
    IntCmp $R4 $R3 done 0 done
    ;If not, continue the loop
    IntOp $R4 $R4 + 1
    Goto loop
  done:
 
/*After this point:
  ------------------------------------------
  $R0 = ResultVar (output)*/
 
  ;Remove part before "SubString" on "String" (if there has one)
  StrCpy $R0 $R1 `` $R4
 
  ;Return output to user
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Exch $R0
FunctionEnd

Versions History

2.0.1
Added support for Unicode strings (not tested by the author).

Credits

Version 2.x - Diego Pedroso (deguix).
Version 1.x - mgentry / Amir Szekely (kichik) / Ximon Eighteen (sunjammer) / Diego Pedroso (deguix).