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IO::Stringy(3pm)      User Contributed Perl Documentation     IO::Stringy(3pm)

       IO-stringy - I/O on in-core objects like strings and arrays

           ::AtomicFile   adpO  Write a file which is updated atomically     ERYQ
           ::Lines        bdpO  I/O handle to read/write to array of lines   ERYQ
           ::Scalar       RdpO  I/O handle to read/write to a string         ERYQ
           ::ScalarArray  RdpO  I/O handle to read/write to array of scalars ERYQ
           ::Wrap         RdpO  Wrap old-style FHs in standard OO interface  ERYQ
           ::WrapTie      adpO  Tie your handles & retain full OO interface  ERYQ

       This toolkit primarily provides modules for performing both traditional
       and object-oriented i/o) on things other than normal filehandles; in
       particular, IO::Scalar, IO::ScalarArray, and IO::Lines.

       In the more-traditional IO::Handle front, we have IO::AtomicFile which
       may be used to painlessly create files which are updated atomically.

       And in the "this-may-prove-useful" corner, we have IO::Wrap, whose
       exported wraphandle() function will clothe anything that's not a
       blessed object in an IO::Handle-like wrapper... so you can just use OO
       syntax and stop worrying about whether your function's caller handed
       you a string, a globref, or a FileHandle.

       Perl's TIEHANDLE spec was incomplete prior to 5.005_57; it was missing
       support for "seek()", "tell()", and "eof()".  Attempting to use these
       functions with an IO::Scalar, IO::ScalarArray, IO::Lines, etc. will not
       work prior to 5.005_57.  None of the relevant methods will be invoked
       by Perl; and even worse, this kind of bug can lie dormant for a while.
       If you turn warnings on (via $^W or "perl -w"), and you see something
       like this...

           seek() on unopened file

       ...then you are probably trying to use one of these functions on one of
       our IO:: classes with an old Perl.  The remedy is to simply use the OO
       version; e.g.:

           $SH->seek(0,0);    ### GOOD: will work on any 5.005
           seek($SH,0,0);     ### WARNING: will only work on 5.005_57 and beyond


       As of version 2.x, this toolkit requires Perl 5.005 for the IO::Handle
       subclasses, and 5.005_57 or better is strongly recommended.  See
       "WARNINGS" for details.


       Most of you already know the drill...

           perl Makefile.PL
           make test
           make install

       For everyone else out there...  if you've never installed Perl code
       before, or you're trying to use this in an environment where your
       sysadmin or ISP won't let you do interesting things, relax: since this
       module contains no binary extensions, you can cheat.  That means
       copying the directory tree under my "./lib" directory into someplace
       where your script can "see" it.  For example, under Linux:

           cp -r IO-stringy-1.234/lib/* /path/to/my/perl/

       Now, in your Perl code, do this:

           use lib "/path/to/my/perl";
           use IO::Scalar;                   ### or whatever

       Ok, now you've been told.  At this point, anyone who whines about not
       being given enough information gets an unflattering haiku written about
       them in the next change log.  I'll do it.  Don't think I won't.

       $Id:,v 1.3 2005/02/10 21:24:05 dfs Exp $

       (2000/08/02)  Finalize $/ support
           Graham Barr submitted this patch half a year ago; Like a moron, I
           lost his message under a ton of others, and only now have the
           experimental implementation done.

           Will the sudden sensitivity to $/ hose anyone out there?  I'm
           worried, so you have to enable it explicitly in 1.x.  It will be on
           by default in 2.x, though only IO::Scalar has been implemented.

       (2001/08/08)  Remove IO::WrapTie from new IO:: classes
           It's not needed.  Backwards compatibility could be maintained by
           having new_tie() be identical to new().  Heck, I'll bet that
           IO::WrapTie should be reimplemented so the returned object is just
           like an IO::Scalar in its use of globrefs.

       Version 2.110   (2005/02/10)
           Maintainership taken over by DSKOLL <>

           Closed the following bugs at

           2208 IO::ScalarArray->getline does not return undef for EOF if

           7132 IO-stringy/Makefile.PL bug - name should be module name

           11249 IO::Scalar flush shouldn't return undef

           2172 $\ (output record separator) not respected

           8605 IO::InnerFile::seek() should return 1 on success

           4798 *.html in lib/

           4369 Improvement: handling of fixed-size reads in IO::Scalar

           (Actually, bug 4369 was closed in Version 2.109)

       Version 2.109   (2003/12/21)
           IO::Scalar::getline now works with ref to int.  Thanks to Dominique
           Quatravaux for this patch.

       Version 2.108   (2001/08/20)
           The terms-of-use have been placed in the distribution file
           "COPYING".  Also, small documentation tweaks were made.

       Version 2.105   (2001/08/09)
           Added support for various seek() whences to IO::ScalarArray.

           Added support for consulting $/ in IO::Scalar and IO::ScalarArray.
           The old "use_RS()" is not even an option.  Unsupported record
           separators will cause a croak().

           Added a lot of regression tests to supoprt the above.

           Better on-line docs (hyperlinks to individual functions).

       Version 2.103   (2001/08/08)
           After sober consideration I have reimplemented IO::Scalar::print()
           so that it once again always seeks to the end of the string.
           Benchmarks show the new implementation to be just as fast as
           Juergen's contributed patch; until someone can convince me
           otherwise, the current, safer implementation stays.

           I thought more about giving IO::Scalar two separate handles, one
           for reading and one for writing, as suggested by Binkley.  His
           points about what tell() and eof() return are, I think, show-
           stoppers for this feature.  Even the manpages for stdio's fseek()
           seem to imply a single file position indicator, not two.  So I
           think I will take this off the TO DO list.  Remedy: you can always
           have two handles open on the same scalar, one which you only write
           to, and one which you only read from.  That should give the same

       Version 2.101   (2001/08/07)
           Alpha release.  This is the initial release of the "IO::Scalar and
           friends are now subclasses of IO::Handle".  I'm flinging it against
           the wall.  Please tell me if the banana sticks.  When it does, the
           banana will be called 2.2x.

           First off, many many thanks to Doug Wilson, who has provided an
           invaluable service by patching IO::Scalar and friends so that they
           (1) inherit from IO::Handle, (2) automatically tie themselves so
           that the "new()" objects can be used in native i/o constructs, and
           (3) doing it so that the whole damn thing passes its regression
           tests.  As Doug knows, my globref Kung-Fu was not up to the task;
           he graciously provided the patches.  This has earned him a seat at
           the Co-Authors table, and the right to have me address him as

           Performance of IO::Scalar::print() has been improved by as much as
           2x for lots of little prints, with the cost of forcing those who
           print-then-seek-then-print to explicitly seek to end-of-string
           before printing again.  Thanks to Juergen Zeller for this patch.

           Added the COPYING file, which had been missing from prior versions.
           Thanks to Albert Chin-A-Young for pointing this out.

           IO::Scalar consults $/ by default (1.x ignored it by default).
           Yes, I still need to support IO::ScalarArray.

       Version 1.221   (2001/08/07)
           I threatened in "INSTALLATION" to write an unflattering haiku about
           anyone who whined that I gave them insufficient information...  but
           it turns out that I left out a crucial direction.  D'OH!  Thanks to
           David Beroff for the "patch" and the haiku...

                  Enough info there?
                    Here's unflattering haiku:
                  Forgot the line, "make"!  ;-)

       Version 1.220   (2001/04/03)
           Added untested SEEK, TELL, and EOF methods to IO::Scalar and
           IO::ScalarArray to support corresponding functions for tied
           filehandles: untested, because I'm still running 5.00556 and Perl
           is complaining about "tell() on unopened file".  Thanks to Graham
           Barr for the suggestion.

           Removed not-fully-blank lines from modules; these were causing lots
           of POD-related warnings.  Thanks to Nicolas Joly for the

       Version 1.219   (2001/02/23)
           IO::Scalar objects can now be made sensitive to $/ .  Pains were
           taken to keep the fast code fast while adding this feature.  Cheers
           to Graham Barr for submitting his patch; jeers to me for losing his
           email for 6 months.

       Version 1.218   (2001/02/23)
           IO::Scalar has a new sysseek() method.  Thanks again to Richard

           New "TO DO" section, because people who submit patches/ideas should
           at least know that they're in the system... and that I won't lose
           their stuff.  Please read it.

           New entries in "AUTHOR".  Please read those too.

       Version 1.216   (2000/09/28)
           IO::Scalar and IO::ScalarArray now inherit from IO::Handle.  I
           thought I'd remembered a problem with this ages ago, related to the
           fact that these IO:: modules don't have "real" filehandles, but the
           problem apparently isn't surfacing now.  If you suddenly encounter
           Perl warnings during global destruction (especially if you're using
           tied filehandles), then please let me know!  Thanks to B. K. Oxley
           (binkley) for this.

           Nasty bug fixed in IO::Scalar::write().  Apparently, the offset and
           the number-of-bytes arguments were, for all practical purposes,
           reversed.  You were okay if you did all your writing with print(),
           but boy was this a stupid bug!  Thanks to Richard Jones for finding
           this one.  For you, Rich, a double-length haiku:

                  Newspaper headline
                     typeset by dyslexic man
                  loses urgency

                  BABY EATS FISH is
                     simply not equivalent
                  to FISH EATS BABY

           New sysread and syswrite methods for IO::Scalar.  Thanks again to
           Richard Jones for this.

       Version 1.215   (2000/09/05)
           Added 'bool' overload to '""' overload, so object always evaluates
           to true.  (Whew.  Glad I caught this before it went to CPAN.)

       Version 1.214   (2000/09/03)
           Evaluating an IO::Scalar in a string context now yields the
           underlying string.  Thanks to B. K. Oxley (binkley) for this.

       Version 1.213   (2000/08/16)
           Minor documentation fixes.

       Version 1.212   (2000/06/02)
           Fixed IO::InnerFile incompatibility with Perl5.004.  Thanks to many
           folks for reporting this.

       Version 1.210   (2000/04/17)
           Added flush() and other no-op methods.  Thanks to Doru Petrescu for
           suggesting this.

       Version 1.209   (2000/03/17)
           Small bug fixes.

       Version 1.208   (2000/03/14)
           Incorporated a number of contributed patches and extensions, mostly
           related to speed hacks, support for "offset", and WRITE/CLOSE
           methods.  Thanks to Richard Jones, Doru Petrescu, and many others.

       Version 1.206   (1999/04/18)
           Added creation of ./testout when Makefile.PL is run.

       Version 1.205   (1999/01/15)
           Verified for Perl5.005.

       Version 1.202   (1998/04/18)
           New IO::WrapTie and IO::AtomicFile added.

       Version 1.110
           Added IO::WrapTie.

       Version 1.107
           Added IO::Lines, and made some bug fixes to IO::ScalarArray.  Also,
           added getc().

       Version 1.105
           No real changes; just upgraded IO::Wrap to have a $VERSION string.

       Primary Maintainer
           David F. Skoll (

       Original Author
           Eryq (  President, ZeeGee Software Inc

           For all their bug reports and patch submissions, the following are
           officially recognized:

                Richard Jones
                B. K. Oxley (binkley)
                Doru Petrescu
                Doug Wilson (for picking up the ball I dropped, and doing tie() right)

       Go to for the latest downloads and on-line
       documentation for this module.

       Enjoy.  Yell if it breaks.

perl v5.10.0                      2005-02-10                  IO::Stringy(3pm)

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