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Teggles · Joined: 16 Jan 2006 Posts: 27

Whenever the character "\0" is in a string, and it is displayed, nothing after it is displayed. For example:

local s = "first" .. "\0" .. "second"
screen:print(0, 0, "s", Color.new(0, 0, 0))

It will only display "first".

I haven't actually tested the above. However, I have io.read files with the \0 character into a variable, and the same effect occurs. I am not sure if the bug is with reading files or displaying strings.

I'm sure I'll get a snarky reply saying it's supposed to do that, but the newline character doesn't do what it's supposed to, making it a stupid thing to say.

Drakonite · Site Admin Joined: 17 Jan 2004 Posts: 989

It's supposed to do that... null termination :P
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Teggles · Joined: 16 Jan 2006 Posts: 27

*shakes fist*

It may be, but I can't avoid it without modifying the string.

Shine · Joined: 03 Dec 2004 Posts: 728 Location: Germany

Take a look at the serial port example in Lua Player for a full terminal simulation with newline and scrolling.

Drakonite · Site Admin Joined: 17 Jan 2004 Posts: 989

You'll either have to modify the string or treat the data differently.
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romero126 · Joined: 24 Dec 2005 Posts: 200

in c the \0 is to signify the end of the entire string. LUA is useing the same format.

SSpeare · Joined: 23 May 2006 Posts: 63

romero126 · Joined: 24 Dec 2005 Posts: 200

SSphear you are absolutly right '\0' is used by c programmers as a char[] terminator to avoid any errors during output. The length still remains the same. Even the string behind char[] remains the same.

While the data is not lost. char[] simply overwrites the data up to a certain level. What that means is that you can also use \0 in c/c++ and it have the same result. However most interpreters use the \0 as an endall for their code.

When you work with strings in c/c++ this gets thrown out since the system uses a allocated char[] based array which is static to the total size of the string. (IE the string is dynamic in size) So when you call string.len (i forget the actual command) it calls the allocated memory for that string. Instead of the first \0.

Simple yet complicated. Hince the previous simplistic comment

"in c the \0 is to signify the end of the entire string. LUA is useing the same format."

Teggles · Joined: 16 Jan 2006 Posts: 27

It's a tedious matter to edit ID3v2 tags, as some have padding. I have to remove then re-insert the padding. Although that is possible and a reasonably easy task, it still seems better to at least give a setting to change how it works. I don't know. I guess I'll just put up with it.