Subj : console.strlen(text) vs. strip_ctrl(text).length
To   : Nightfox
From : Digital Man
Date : Sun Jan 04 2015 07:20 pm

  Re: console.strlen(text) vs. strip_ctrl(text).length
  By: Nightfox to Digital Man on Sun Jan 04 2015 09:39 am

 > Hi DM,
 >
 > While working on one of my scripts, there are some places where I need to
 > get the length of a string as it will appear on the screen.  It seems there
 > are two ways to do so - console.strlen(text) and strip_ctrl(text).length.
 > While working on one of my JS scripts, I noticed I'm getting two different
 > results from each of those ways of getting string length for one of my
 > script's strings.  Specifically, my string has a 4 special characters to
 > represent arrows, which are counted by console.strlen(), but those special
 > arrow characters seem to be removed by strip_ctrl().  The following image
 > shows the text line output from my script with the 4 arrow characters (it's
 > a help line showing some valid key commands):
 > http://home.comcast.net/~nightfox/BBSStuff/helpLine.png
 >
 > The length returned by console.strlen() is 79, whereas the length returned
 > by strip_ctrl(text).length is 75.
 >
 > The documentation says console.strlen() will exclude Ctrl-A codes, while
 > strip_ctrl() removes control characters.  It sounds like strip_ctrl() might
 > be removing all control characters (not just Ctrl-A characters), is that
 > correct? I was curious if what I'm seeing is the expected behavior.

Yes, strip_ctrl() removes all control characters (ASCII value less than 32) and
all Ctrl-A code sequences.

What's the ASCII value of these "4 special characters to represent arrows"?

                                            digital man

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