Concatenation failure on 4096 byte boundries

[maxxon]

This is an odd one that I found while profile testing some of my code:

global output__junk = BlankClip(height=0, width=0, length=0)
global output__filename = "output.log"
function output(string s)
{
    output__junk.WriteFileStart(output__filename, "s", append=true)
    return 1
}

a = "        " # 8 
b = a+a+a+a+a+a+a+a # 64
c = b+b+b+b+b+b+b+b # 512
d = c+c+c+c+c+c+c+b+b+b+b+b+b+b+a+a+a+a+a+a+a+"      " # 4094
d.strlen.string.output
e = d + " "
e.strlen.string.output
e.output

I've not put in the code to actually output the byte locations (requires too much of my libraries), but if you check it out with an editor, you'll find that the 3rd line outputted contains crap near the end of the string and the string length has increased by 2-4 characters rather than 1.

Must have something to do with your string allocation methods as this can happen on any 4096 byte boundary, though it doesn't always happen. It appears that certain even multiple cats can keep this from happening.


|\/|x