Trim spaces on the right of the input value (code128)

[APP-OYTEC]

Hi,

I have text values that are set by an external software (it does find&replace for placeholders) and the values have spaces at the right (to fill the maximum field length I suppose).

I am new in postscript and trying to find a working example of trimming right spaces before calling the /code128 barcode generator. No success so far.

Is there an option in postcriptbarcode generators to do the trim? Or any well known postscript template that makes the same?

Thanks!

[terryburton]

Just ask ChatGPT:

Hi,

I have text values that are set by an external software (it does find&replace for placeholders) and the values have spaces at the right (to fill the maximum field length I suppose).

I am new in postscript and trying to find a working example of trimming right spaces before calling the /code128 barcode generator. No success so far.

Is there an option in postcriptbarcode generators to do the trim? Or any well known postscript template that makes the same?

Thanks!

ChatGPT output:

In PostScript, there isn't a built-in right-trim function, but you can create one fairly easily. The postscriptbarcode library doesn't have a built-in trim option, so you'll need to handle this before passing the data to the barcode generator.

Here's PostScript code that uses a function to trim right spaces:

%PS

% ... BWIPP resources ...

/rtrim {
    dup length 1 sub
    { dup 2 index exch get 32 ne { 1 add exit } if 1 sub dup 0 lt { exit } if } loop
    0 exch getinterval
} bind def

0 0 moveto
(BARCODE123   ) rtrim
()
/code39 /uk.co.terryburton.bwipp findresource exec

showpage

[ The usual waffle ensues... ]
...

[APP-OYTEC]

That example works! Before I created this post I tried several prompts with ChatGPT indeed. All the examples were crashing the PS viewer (so I opted to see if there's some trim option in the barcode generators).
In fact if I prompt now the text of the post, the Chatgpt output to me is different that the one you received, and it makes the PS viewer crash.
Thanks a lot for your answer.