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[perl #84680] POSIX::isdigit() returns 1 for the empty string
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From:
Robert Lang
Date:
February 24, 2011 00:33
Subject:
[perl #84680] POSIX::isdigit() returns 1 for the empty string
Message ID:
rt-3.6.HEAD-24085-1298392064-770.84680-75-0@perl.org
# New Ticket Created by Robert Lang
# Please include the string: [perl #84680]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=84680 >
This is a bug report for perl from perlbug@cg.cjb.net,
generated with the help of perlbug 1.39 running under perl 5.12.3.
-----------------------------------------------------------------
[Please describe your issue here]
POSIX::isdigit() returns 1 for the empty string which is
obviously wrong:
$ perl -MPOSIX -e 'print isdigit(""), "\n"'
1
$
That's probably because RETVAL is initialised to 1 in POSIX.xs
regardless of the string length (which is the case in all is*()
functions ...).
Verified with Perl 5.8.8, 5.10.1 and 5.12.3
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=library
severity=medium
module=POSIX
---
Site configuration information for perl 5.12.3:
Configured by xx at Tue Feb 22 16:50:33 CET 2011.
Summary of my perl5 (revision 5 version 12 subversion 3) configuration:
Platform:
osname=linux, osvers=2.6.34.7-66.fc13.i686.pae, archname=i686-linux
uname='linux xx 2.6.34.7-66.fc13.i686.pae #1 smp wed dec 15
07:21:49 utc 2010 i686 i686 i386 gnulinux '
config_args='-de -Dprefix=/tmp/perl-5.12.3'
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='4.4.5 20101112 (Red Hat 4.4.5-2)',
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-2.12.2.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.12.2'
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 5.12.3:
/tmp/perl-5.12.3/lib/site_perl/5.12.3/i686-linux
/tmp/perl-5.12.3/lib/site_perl/5.12.3
/tmp/perl-5.12.3/lib/5.12.3/i686-linux
/tmp/perl-5.12.3/lib/5.12.3
.
---
Environment for perl 5.12.3:
HOME=/home/xx
LANG=en_US.UTF-8
LANGUAGE (unset)
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/usr/kerberos/sbin:/usr/kerberos/bin:/usr/local/bin:/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/sbin:/home/xx/bin
PERL_BADLANG (unset)
SHELL=/bin/bash
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[perl #84680] POSIX::isdigit() returns 1 for the empty string
by Robert Lang