[perl #33703] Using format variable & write command clears hash values

# New Ticket Created by  Fraya.Cohen@synopsys.com 
# Please include the string:  [perl #33703]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org:80/rt3/Ticket/Display.html?id=33703 >



This is a bug report for perl from fraya@synopsys.com,
generated with the help of perlbug 1.35 running under perl v5.8.5.

#! /usr/bin/env perl -w

## The bug that I'm seeing is that when I use the format command then
## perform the write then the value associated with a particular key
## is cleared.  I am passing the hash to a sub-routine shown below
## then trying to print a value from the hash reference.  Then I'd like
## to continue using the hash value, but it is cleared after performing the
## write command.  This appears to be a Perl bug since I've looked through
## the documenation, and I can't find where this is specified as expected behavior.
## Plus it's pretty annoying since I want to use the hash values after printing them, but I can't due to this bug.

## -- Fraya Cohen
## fraya@synopsys.com
## Sr. IC Design Engineer, Synopsys, Inc.



package printing;
use strict;
use Carp;
use FileHandle;
use English;

sub print_fruit
{
  my ($self, $sim) = @_;

  my $file_name = "./fruit_rpt.txt";

  print $sim->{'fruit'};
  print " is the fruit inside print_fruit\n";

  format STDOUT =
   |  ^<<<<<<<< |||
$sim->{'fruit'}
.
 
    write;

  print $sim->{'fruit'};
  print " is the fruit inside print_fruit after write\n";

}

package main;
use strict;
use Carp;

{
my %sim = (fruit=> "apple");

print $sim{'fruit'};
print " is the value of fruit before format\n";

my $print = printing->print_fruit(\%sim);

print $sim{'fruit'};
print " is the value of fruit after format\n";
}

---
Flags:
    category=core
    severity=medium
---
Site configuration information for perl v5.8.5:

Configured by corey at Fri Dec  3 16:18:28 CST 2004.

Summary of my perl5 (revision 5 version 8 subversion 5) configuration:
  Platform:
    osname=solaris, osvers=2.8, archname=sun4-solaris
    uname='sunos sol8gcc 5.8 generic_108528-15 sun4u sparc '
    config_args='-de -Dcc=gcc -Duseshrplib -Dprefix=/global/freeware/SunOS/5.8/perl-5.8.5'
    hint=recommended, useposix=true, d_sigaction=define
    usethreads=undef use5005threads=undef useithreads=undef usemultiplicity=undef
    useperlio=define d_sfio=undef uselargefiles=define usesocks=undef
    use64bitint=undef use64bitall=undef uselongdouble=undef
    usemymalloc=n, bincompat5005=undef
  Compiler:
    cc='gcc', ccflags ='-fno-strict-aliasing -pipe -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
    optimize='-O',
    cppflags='-fno-strict-aliasing -pipe -I/usr/local/include'
    ccversion='', gccversion='2.95.3 20010315 (release)', gccosandvers='solaris2.8'
    intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=4321
    d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
    ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
    alignbytes=8, prototype=define
  Linker and Libraries:
    ld='gcc', ldflags =' -L/usr/local/lib '
    libpth=/usr/local/lib /usr/lib /usr/ccs/lib
    libs=-lsocket -lnsl -ldl -lm -lc
    perllibs=-lsocket -lnsl -ldl -lm -lc
    libc=/lib/libc.so, so=so, useshrplib=true, libperl=libperl.so
    gnulibc_version=''
  Dynamic Linking:
    dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='  -R /global/freeware/SunOS/5.8/perl-5.8.5/lib/5.8.5/sun4-solaris/CORE'
    cccdlflags='-fPIC', lddlflags='-G -L/usr/local/lib'

Locally applied patches:
    

---
@INC for perl v5.8.5:
    /global/freeware/SunOS/5.8/2003.01/perl/lib/site_perl/5.8.5
    /global/local/2003.01/perl/lib/site_perl/5.6.1/sun4-solaris
    /global/local/2003.01/perl/lib/site_perl/5.6.1
    /global/freeware/SunOS/5.8/perl-5.8.5/lib/5.8.5/sun4-solaris
    /global/freeware/SunOS/5.8/perl-5.8.5/lib/5.8.5
    /global/freeware/SunOS/5.8/perl-5.8.5/lib/site_perl/5.8.5/sun4-solaris
    /global/freeware/SunOS/5.8/perl-5.8.5/lib/site_perl/5.8.5
    /global/freeware/SunOS/5.8/perl-5.8.5/lib/site_perl
    .

---
Environment for perl v5.8.5:
    HOME=/home/fraya
    LANG=C
    LANGUAGE (unset)
    LD_LIBRARY_PATH=/global/freeware/SunOS/5.8/gcc-3.3.2/lib:/global/apps/vcs_7.1.1L1/sparcOS5/gnulib:/global/apps1/vera_6.3.30/vera-6.3.30-solaris7/lib:/global/apps1/vera_6.3.30/vera-6.3.30-solaris7/lib/mti:/global/apps1/vera_6.3.30/vera-6.3.30-solaris7/lib/sro:/global/apps1/vera_6.3.30/vera-6.3.30-solaris7/lib/nc_vhdl:/global/local/2003.01/lib:/usr/local/lib
    LOGDIR (unset)
    PATH=/global/freeware/SunOS/5.8/gcc-3.3.2/bin:/global/apps/vcs_7.1.1L1/bin:/global/apps/vcs_7.1.1L1/gui/virsim/bin:/global/apps/vcs_7.1.1L1/sparcOS5/bin:/global/freeware/SunOS/5.8/perl-5.8.5/bin:/global/apps1/vera_6.3.30/vera-6.3.30-solaris7/bin:/global/apps/mti_6.0/modeltech/bin:/global/apps/mti_6.0/modeltech/sunos5:/global/local/2003.01/bin:/global/apps/lsf/6.0/sparc-sol7-64/etc:/global/apps/lsf/6.0/sparc-sol7-64/bin:/usr/bin:/usr/X/bin:/usr/dt/bin:/usr/openwin/demo:/usr/local/bin:/bin:/usr/ucb:/usr/xpg4/bin:/usr/ccs/bin:/usr/openwin/bin:/opt/CTXSmf/bin:.:/opt/CTXSmf/bin
    PERL5LIB=/global/freeware/SunOS/5.8/2003.01/perl/lib/site_perl/5.8.5:/global/local/2003.01/perl/lib/site_perl/5.6.1
    PERL_BADLANG (unset)
    SHELL=/global/bin/tcsh

• RE: [perl #33703] Using format variable & write command clears hash values by Fraya Cohen
• [perl #33703] Using format variable & write command clears hash values by Fraya . Cohen @ synopsys . com
• Re: [perl #33703] Using format variable & write command clears hash values by Dave Mitchell