Weird behavior of string.find()

Hi, I want to make some kind of server program, which receives commands over rednet and executes them. I wrote a function which seperates the command and its parameters. It looks like this:

function getCmd(message)
cmd = {}
spaces = {}
pos = 0
j = 0
while pos ~= nil do
  pos = string.find(message, " ", pos + 1, true)
  if pos ~= nil then
   spaces[j] = pos
   j = j + 1
  end
end
length = string.len(message)
spacesX = {0}
for i = 1, #spaces do
  spacesX[i + 1] = spaces[i]
end
spacesX[#spaces + 2] = length + 1
for i = 1, #spaces + 1 do
  cmd[i] = string.sub(message, spacesX[i] + 1, spacesX[i + 1] - 1)
end
return cmd
end

This function should first write down the position of each space in the table spaces. Then it should write the command and each parameter in a field of cmd and return cmd. This function returned weird results so I added two print() commands to the function, it looks like this:

function getCmd(message)
cmd = {}
spaces = {}
pos = 0
j = 0
while pos ~= nil do
  print(message)
  pos = string.find(message, " ", pos + 1, true)
  if pos ~= nil then
   print(pos)
   spaces[j] = pos
   j = j + 1
  end
end
length = string.len(message)
spacesX = {0}
for i = 1, #spaces do
  spacesX[i + 1] = spaces[i]
end
spacesX[#spaces + 2] = length + 1
for i = 1, #spaces + 1 do
  cmd[i] = string.sub(message, spacesX[i] + 1, spacesX[i + 1] - 1)
end
return cmd
end

Now it should every time it goes trough the loop print the message it receives when the function is called and the position of the space it found. But when I send the message "login testpass", it prints out 10 as the space position. The message doesn't change, so it seems like string.find() receives correct parameters but returns a wrong position.

I copied the function into a new file and changed really nothing, but when I used the copied function it worked right. In this test the program red the command from the terminal, normally it receives it per rednet.

I don't understand why the function acts like this and hope you can help me.

Palaton

Use string.find(message.."", " ", pos+1, true)

Thank you very much, it works!