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[perl #80190] Length-caching bug in utf8::decode
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From:
Eric Brine
Date:
December 3, 2010 10:41
Subject:
[perl #80190] Length-caching bug in utf8::decode
Message ID:
rt-3.6.HEAD-13564-1291401670-111.80190-75-0@perl.org
# New Ticket Created by "Eric Brine"
# Please include the string: [perl #80190]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=80190 >
This is a bug report for perl from ikegami@adaelis.com,
generated with the help of perlbug 1.39 running under perl 5.12.2.
-----------------------------------------------------------------
[Please describe your issue here]
There's a length caching bug in utf8::decode.
----- BEGIN TEST CODE -----
#!/usr/bin/perl
use strict;
use warnings;
use Test::More tests => 8;
{ # Baseline.
my $s = "\xE8\xAB\x86\x0A";
utf8::downgrade($s); is(length($s), 4); is($s, "\xE8\xAB\x86\x0A");
utf8::decode($s); is(length($s), 2); is($s, "\x{8AC6}\n");
}
{ # Check for length-caching bug.
my $s = "\xE8\xAB\x86\x0A";
utf8::upgrade($s); is(length($s), 4); is($s, "\xE8\xAB\x86\x0A");
utf8::decode($s); is(length($s), 2); is($s, "\x{8AC6}\n");
}
----- END TEST CODE -----
----- BEGIN TEST OUTPUT -----
1..8
ok 1
ok 2
ok 3
ok 4
ok 5
ok 6
not ok 7
# Failed test at a.pl line 15.
# got: '4'
# expected: '2'
ok 8
# Looks like you failed 1 test of 8.
----- END TEST OUTPUT -----
davem says it's still present in blead.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=library
severity=low
module=utf8
---
Site configuration information for perl 5.12.2:
Configured by eric at Wed Sep 8 16:01:41 EDT 2010.
Summary of my perl5 (revision 5 version 12 subversion 2) configuration:
Platform:
osname=linux, osvers=2.6.26-2-686, archname=i686-linux
uname='linux fmdev10 2.6.26-2-686 #1 smp tue mar 9 17:35:51 utc 2010
i686 gnulinux '
config_args='-de -Dprefix=/home/eric/usr/perlbrew/perls/perl-5.12.2'
hint=recommended, useposix=true, d_sigaction=define
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='cc', ccflags ='-fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O2',
cppflags='-fno-strict-aliasing -pipe -fstack-protector
-I/usr/local/include'
ccversion='', gccversion='4.3.2', gccosandvers=''
intsize=4, longsize=4, ptrsize=4, doublesize=8, byteorder=1234
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=12
ivtype='long', ivsize=4, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=4, prototype=define
Linker and Libraries:
ld='cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib
libs=-lnsl -ldl -lm -lcrypt -lutil -lc
perllibs=-lnsl -ldl -lm -lcrypt -lutil -lc
libc=/lib/libc-2.7.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.7'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O2 -L/usr/local/lib
-fstack-protector'
Locally applied patches:
---
@INC for perl 5.12.2:
/home/eric/usr/perlbrew/perls/perl-5.12.2/lib/site_perl/5.12.2/i686-linux
/home/eric/usr/perlbrew/perls/perl-5.12.2/lib/site_perl/5.12.2
/home/eric/usr/perlbrew/perls/perl-5.12.2/lib/5.12.2/i686-linux
/home/eric/usr/perlbrew/perls/perl-5.12.2/lib/5.12.2
.
---
Environment for perl 5.12.2:
HOME=/home/eric
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/eric/usr/perlbrew/bin:/home/eric/usr/perlbrew/perls/current/bin:.:/home/eric/bin:/usr/local/bin:/usr/bin:/bin:/usr/games
PERLBREW_ROOT=/home/eric/usr/perlbrew
PERL_BADLANG (unset)
SHELL=/bin/bash
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[perl #80190] Length-caching bug in utf8::decode
by Eric Brine