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Re: Bad Characters
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Re: Bad Characters


  • Subject: Re: Bad Characters
  • From: Luther Fuller <email@hidden>
  • Date: Wed, 15 Oct 2008 20:28:12 -0500

Christopher Nebel wrote:
It looks like all non-printing control characters compare as equal. Try the ASCII control range for comparison. Is this of practical concern, or are you just poking around?

It started out as a practical concern, trying to find a reason for a bug in my application.
Turns out this isn't the cause of my bug, so I guess I have degenerated into poking around.


And Mark J. Reed said:
If you need to compare a character to nul exactly, try taking its id
and comparing it to 0:

   if id of testChar = id of nullChar

or just

if id of testChar = 0

The 'id of testChar' is the correct value as set in the script, not 0.
I can scan a string for a character whose id > 0 and take action based on the value of the id.
I just have to avoid comparing the character to the null character.
We have a situation where:
1. (id of testChar) ≠ 0 is true; and
2. testChar = nullChar is true.
But these are inconsistent truths.
(Mathematicians use the term "inconsistent" where programmers would use the term "bug".)


Again Mark J. Reed commented:
Luther:  I should add that while I proposed a workaround for this
behavior, I would agree that it is incorrect - if not a bug, at least
a misfeature.  I think you should open a bug report on it.

I'll report it.

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References: 
 >Bad Characters (From: Luther Fuller <email@hidden>)
 >Re: Bad Characters (From: Christopher Nebel <email@hidden>)

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