Comparing Two Version Numbers: Difference between revisions
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{ | {{PageAuthor|comperio}} | ||
== Description == | == Description == | ||
I was searching for a function that could compare two version numbers | <p style="border: 1px solid #F00; padding: 5px; font-weight: bold">Please note that this function has been superseded by the [[VersionCompare]] function.</p> | ||
I was searching for a function that could compare two version numbers. | |||
I was having a hard time stepping through the existing code, so I decided to write my own variation. I've tested every possible scenerio I could think of and could not make it fail. It will handle from 1 to up to 4 sections (ex: "1.2.3.4") as long as the version number string consists of strictly numbers (no letters). | I was having a hard time stepping through the existing code, so I decided to write my own variation. I've tested every possible scenerio I could think of and could not make it fail. It will handle from 1 to up to 4 sections (ex: "1.2.3.4") as long as the version number string consists of strictly numbers (no letters). | ||
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Exch | Exch | ||
Push $R0 | Push $R0 | ||
; initialize Variables | |||
StrCpy $V1 "" | |||
StrCpy $V2 "" | |||
StrCpy $P1 "" | |||
StrCpy $P2 "" | |||
StrCpy $Reslt "" | |||
; Set the file pointers: | ; Set the file pointers: | ||
IntOp $P1 $P1 + 1 | IntOp $P1 $P1 + 1 | ||
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</highlight-nsis> | </highlight-nsis> | ||
[[ | [[Category:Version Manipulation Functions]] | ||
Latest revision as of 12:35, 31 December 2008
| Author: comperio (talk, contrib) |
Description
Please note that this function has been superseded by the VersionCompare function.
I was searching for a function that could compare two version numbers.
I was having a hard time stepping through the existing code, so I decided to write my own variation. I've tested every possible scenerio I could think of and could not make it fail. It will handle from 1 to up to 4 sections (ex: "1.2.3.4") as long as the version number string consists of strictly numbers (no letters).
The Script
The code is below. The documentation throughout the code should make it easy enough to follow:
; Created 1/5/05 by Comperio ; ; Usage: ; ${VersionCheck} "Version1" "Version2" "outputVar" ; Version1 = 1st version number ; Version2 = 2nd version number ; outputVar = Variable used to store the ouput ; ; Return values: ; 0 = both versions are equal ; 1 = Version 1 is NEWER than version 2 ; 2 = Version1 is OLDER than version 2 ; Rules for Version Numbers: ; Version numbers must always be a string of numbers only. (A dot ; in the name is optional). ; ; [Variables] var P1 ; file pointer, used to "remember" the position in the Version1 string var P2 ; file pointer, used to "remember" the position in the Version2 string var V1 ;version number from Version1 var V2 ;version number from Version2 Var Reslt ; holds the return flag ; [Macros] !macro VersionCheck Ver1 Ver2 OutVar ; To make this work, one character must be added to the version string: Push "x${Ver2}" Push "x${Ver1}" Call VersionCheckF Pop ${OutVar} !macroend ; [Defines] !define VersionCheck "!insertmacro VersionCheck" ; [Functions] Function VersionCheckF Exch $1 ; $1 contains Version 1 Exch Exch $2 ; $2 contains Version 2 Exch Push $R0 ; initialize Variables StrCpy $V1 "" StrCpy $V2 "" StrCpy $P1 "" StrCpy $P2 "" StrCpy $Reslt "" ; Set the file pointers: IntOp $P1 $P1 + 1 IntOp $P2 $P2 + 1 ; ******************* Get 1st version number for Ver1 ********************** V11: ; I use $1 and $2 to help keep identify "Ver1" vs. "Ver2" StrCpy $R0 $1 1 $P1 ;$R0 contains the character at position $P1 IntOp $P1 $P1 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V11end 0 ;check for empty string strCmp $R0 "." v11end 0 strCpy $V1 "$V1$R0" Goto V11 V11End: StrCmp $V1 "" 0 +2 StrCpy $V1 "0" ; ******************* Get 1st version number for Ver2 ********************** V12: StrCpy $R0 $2 1 $P2 ;$R0 contains the character at position $P1 IntOp $P2 $P2 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V12end 0 ;check for empty string strCmp $R0 "." v12end 0 strCpy $V2 "$V2$R0" Goto V12 V12End: StrCmp $V2 "" 0 +2 StrCpy $V2 "0" ; At this point, we can compare the results. If the numbers are not ; equal, then we can exit IntCmp $V1 $V2 cont1 older1 newer1 older1: ; Version 1 is older (less than) than version 2 StrCpy $Reslt 2 Goto ExitFunction newer1: ; Version 1 is newer (greater than) Version 2 StrCpy $Reslt 1 Goto ExitFunction Cont1: ;Versions are the same. Continue searching for differences ; Reset $V1 and $V2 StrCpy $V1 "" StrCpy $V2 "" ; ******************* Get 2nd version number for Ver1 ********************** V21: StrCpy $R0 $1 1 $P1 ;$R0 contains the character at position $P1 IntOp $P1 $P1 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V21end 0 ;check for empty string strCmp $R0 "." v21end 0 strCpy $V1 "$V1$R0" Goto V21 V21End: StrCmp $V1 "" 0 +2 StrCpy $V1 "0" ; ******************* Get 2nd version number for Ver2 ********************** V22: StrCpy $R0 $2 1 $P2 ;$R0 contains the character at position $P1 IntOp $P2 $P2 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V22end 0 ;check for empty string strCmp $R0 "." V22end 0 strCpy $V2 "$V2$R0" Goto V22 V22End: StrCmp $V2 "" 0 +2 StrCpy $V2 "0" ; At this point, we can compare the results. If the numbers are not ; equal, then we can exit IntCmp $V1 $V2 cont2 older2 newer2 older2: ; Version 1 is older (less than) than version 2 StrCpy $Reslt 2 Goto ExitFunction newer2: ; Version 1 is newer (greater than) Version 2 StrCpy $Reslt 1 Goto ExitFunction Cont2: ;Versions are the same. Continue searching for differences ; Reset $V1 and $V2 StrCpy $V1 "" StrCpy $V2 "" ; ******************* Get 3rd version number for Ver1 ********************** V31: StrCpy $R0 $1 1 $P1 ;$R0 contains the character at position $P1 IntOp $P1 $P1 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V31end 0 ;check for empty string strCmp $R0 "." v31end 0 strCpy $V1 "$V1$R0" Goto V31 V31End: StrCmp $V1 "" 0 +2 StrCpy $V1 "0" ; ******************* Get 3rd version number for Ver2 ********************** V32: StrCpy $R0 $2 1 $P2 ;$R0 contains the character at position $P1 IntOp $P2 $P2 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V32end 0 ;check for empty string strCmp $R0 "." V32end 0 strCpy $V2 "$V2$R0" Goto V32 V32End: StrCmp $V2 "" 0 +2 StrCpy $V2 "0" ; At this point, we can compare the results. If the numbers are not ; equal, then we can exit IntCmp $V1 $V2 cont3 older3 newer3 older3: ; Version 1 is older (less than) than version 2 StrCpy $Reslt 2 Goto ExitFunction newer3: ; Version 1 is newer (greater than) Version 2 StrCpy $Reslt 1 Goto ExitFunction Cont3: ;Versions are the same. Continue searching for differences ; Reset $V1 and $V2 StrCpy $V1 "" StrCpy $V2 "" ; ******************* Get 4th version number for Ver1 ********************** V41: StrCpy $R0 $1 1 $P1 ;$R0 contains the character at position $P1 IntOp $P1 $P1 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V41end 0 ;check for empty string strCmp $R0 "." v41end 0 strCpy $V1 "$V1$R0" Goto V41 V41End: StrCmp $V1 "" 0 +2 StrCpy $V1 "0" ; ******************* Get 4th version number for Ver2 ********************** V42: StrCpy $R0 $2 1 $P2 ;$R0 contains the character at position $P1 IntOp $P2 $P2 + 1 ;increments the file pointer for the next read StrCmp $R0 "" V42end 0 ;check for empty string strCmp $R0 "." V42end 0 strCpy $V2 "$V2$R0" Goto V42 V42End: StrCmp $V2 "" 0 +2 StrCpy $V2 "0" ; At this point, we can compare the results. If the numbers are not ; equal, then we can exit IntCmp $V1 $V2 cont4 older4 newer4 older4: ; Version 1 is older (less than) than version 2 StrCpy $Reslt 2 Goto ExitFunction newer4: ; Version 1 is newer (greater than) Version 2 StrCpy $Reslt 1 Goto ExitFunction Cont4: ;Versions are the same. We've reached the end of the version ; strings, so set the function to 0 (equal) and exit StrCpy $Reslt 0 ExitFunction: Pop $R0 Pop $1 Pop $2 Push $Reslt FunctionEnd
