Tera Term

Hi folks!

I have an issue when I try to change something in a .txt-file. I'm about to create some kind of "default config" for my firmware flash script. The scripts checks for availiable value in the default-config-file, if some value is found, its used as a default value for the inputbox and if the value changes, the old value is replaced by the new one.
I have a few variables saved in the mentioned file, which look like this:

var1=10
var2=20
var3=30
var4=40
var5=50
...

After I write the value for var3 to 3000, the .txt-file looks like this:


var1=10
var2=20
var3=300
r4=40
var5=50

You can see, that the two new characters replace

I could read all the values an write them back into the file with the new values or i could write the new value on the end of the file. But is there any more elegant solution for this problem?
My code:
-------------------------------------------------------------------------
defaultFile = 'Default.ini'
defaultVariable = 'var3'
call checkForDefault
inputbox 'Value for var3:' 'Values' line
call checkForNewDefault

end

:checkForDefault
line = ''
fileopen fHandle defaultFile 0 1
filestrseek fHandle defaultVariable
if result > 0 then
filestrseek fHandle '='
filereadln fHandle line
endif
fileclose fHandle
return

:CheckForNewDefault
strcompare inputstr line
if result != 0 then
fileopen fHandle defaultFile 0
filestrseek fHandle defaultVariable
if result > 0 then
filestrseek fHandle '='
strconcat newinputstr inputstr
filewriteln fHandle newinputstr
endif
fileclose fHandle
endif
return
-------------------------------------------------------------------------

Thank you in advance!