Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

write() removes trailing spaces

by jesuashok (Curate)
on Jun 09, 2006 at 08:06 UTC ( #554441=perlquestion: print w/ replies, xml ) Need Help??
jesuashok has asked for the wisdom of the Perl Monks concerning the following question:

Dear fello monks,

There is a strange behaviour with the write() function, that is not documented: a little program would be the best way to explain

#!/usr/bin/perl format STDOUT = @<<<<@<<<<@<<<<<<<<<< $a, $b, $c . $a = "a"; $b = "b"; $c = "c "; write(STDOUT);

I'd expect something like this to be printed:

'a b c '


What I get instead is

'a b c'

In the documentation there's no advice that trailing spaces will be automatically removed, nor a way to avoid that is descripted.

"Keep pouring your ideas"

Considered by shmem: unapprove (plagiarized from p5p)
Approval removed by Arunbear; Keep: 1, Edit: 13, Reap: 11

Comment on write() removes trailing spaces
Select or Download Code
Re: write() removes trailing spaces
by ioannis (Priest) on Jun 09, 2006 at 08:35 UTC
    There is nothing strange. The following altered code demonstrates that your $c variable contains 13 chars , which you want displayed within 11 space holders (1+10). Two chars werer choped, as per your request .
    format STDOUT = @<<<<@<<<<@<<<<<<<<<<END $a, $b, $c . $a = "a"; $b = "b"; $c = "c .bc"; print 'len=',length $c; write(STDOUT);

    Produces this output:

    len=13 a b c .END
      Hi ioannis

      Thanks for your reply.

      what will happen if $c is only

      $c = "c ";
      The last spaces are removed. This detail is not documented in any of the perl documents.

      "Keep pouring your ideas"
        if $c is set to 'c ', then it will append 9 spaces at the end, so the string can occupy the 11 posisions. (Remember, it is 1 + 10 .)
Re: write() removes trailing spaces
by Joost (Canon) on Jun 09, 2006 at 10:22 UTC
    Given that formats are intended to create plain text printable reports, removing trailing spaces certainly makes sense, if only for efficiency.

    But indeed, it might be a good idea to document that somewhere (I havent searched everywhere, but it doesn't appear to be documented right now). If it's really undocumented, you could write a documentation patch and submit it to the perl5 porters.

      Hi

      Joost, It sounds good. Thanks a lot for you confirmation.

      "Keep pouring your ideas"
Re: write() removes trailing spaces (plagiarized)
by shmem (Canon) on Oct 09, 2006 at 09:28 UTC
    Ripped from p5p.

    Original post is here.

    --shmem

    _($_=" "x(1<<5)."?\n".q·/)Oo.  G°\        /
                                  /\_¯/(q    /
    ----------------------------  \__(m.====·.(_("always off the crowd"))."·
    ");sub _{s./.($e="'Itrs `mnsgdq Gdbj O`qkdq")=~y/"-y/#-z/;$e.e && print}

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: perlquestion [id://554441]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (12)
As of 2014-07-14 07:05 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    When choosing user names for websites, I prefer to use:








    Results (255 votes), past polls