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<<>> operator introduction causes regression of behaviour of "readline" builtin. #14561

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p5pRT opened this issue Mar 5, 2015 · 4 comments
Closed

<<>> operator introduction causes regression of behaviour of "readline" builtin. #14561

p5pRT opened this issue Mar 5, 2015 · 4 comments

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@p5pRT
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p5pRT commented Mar 5, 2015

Migrated from rt.perl.org#123990 (status was 'resolved')

Searchable as RT123990$
@p5pRT
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p5pRT commented Mar 5, 2015

From @kentfredric

Perl 5.20.9​:

perl -e 'while(readline){ print $_ }' 'echo insecure |'
Can't open ls -la |​: No such file or directory at -e line 1.

perl 5.20.0​:

perl -e 'while(readline){ print $_ }' 'echo insecure |'
insecure

More over, deparsing this syntax ( and the <<>> syntax ) returns code that behaves differently to the syntax offered.

perl -e 'while(readline){ print $_ }' 'echo insecure |'
Can't open ls -la |​: No such file or directory at -e line 1.

perl -MO=Deparse -e 'while(readline){ print $_ }' 'echo insecure |'
while (defined($_ = <ARGV>)) {
  print $_;
}

perl -MO=Deparse -e 'while(<<>>){ print $_ }' 'echo hello |'
while (defined($_ = <ARGV>)) {
  print $_;
}

perl -MO=Deparse -e 'while(<>){ print $_ }' 'echo hello |'
while (defined($_ = <ARGV>)) {
  print $_;
}

perl -e 'while(defined($_ =<ARGV>)){ print $_ }' 'echo insecure |'
insecure

Flags​:
  category=core
  severity=low

Site configuration information for perl 5.21.9​:

Configured by kent at Wed Feb 11 00​:16​:37 NZDT 2015.

Summary of my perl5 (revision 5 version 21 subversion 9) configuration​:
  Derived from​: 5904c5c
  Platform​:
  osname=linux, osvers=3.18.3-aufs, archname=x86_64-linux
  uname='linux katipo2 3.18.3-aufs #21 smp preempt mon jan 26 09​:49​:29 nzdt 2015 x86_64 intel(r) core(tm) i5-2410m cpu @​ 2.30ghz genuineintel gnulinux '
  config_args='-de -Dprefix=/home/kent/perl5/perlbrew/perls/5.21.8-c -Dusecbacktrace -Doptimize=-O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions -Dman1dir=none -Dman3dir=none -Dusedevel -Accflags=-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -Aldflags= -fprofile-use -lbfd -Aeval​:scriptdir=/home/kent/perl5/perlbrew/perls/5.21.8-c/bin'
  hint=recommended, useposix=true, d_sigaction=define
  useithreads=undef, usemultiplicity=undef
  use64bitint=define, use64bitall=define, uselongdouble=undef
  usemymalloc=n, bincompat5005=undef
  Compiler​:
  cc='cc', ccflags ='-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -DUSE_C_BACKTRACE -g -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
  optimize='-O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions',
  cppflags='-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong'
  ccversion='', gccversion='4.9.2', gccosandvers=''
  intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3
  d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3
  ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
  alignbytes=8, prototype=define
  Linker and Libraries​:
  ld='cc', ldflags =' -fprofile-use -lbfd -fstack-protector-strong -L/usr/local/lib'
  libpth=/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/include-fixed /usr/lib /usr/local/lib /lib/../lib64 /usr/lib/../lib64 /lib /lib64 /usr/lib64 /usr/local/lib64
  libs=-lpthread -lnsl -lnm -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
  perllibs=-lpthread -lnsl -lnm -ldl -lm -lcrypt -lutil -lc
  libc=libc-2.20.so, so=so, useshrplib=false, libperl=libperl.a
  gnulibc_version='2.20'
  Dynamic Linking​:
  dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
  cccdlflags='-fPIC', lddlflags='-shared -O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions -L/usr/local/lib -fstack-protector-strong'

Locally applied patches​:
  uncommitted-changes

@​INC for perl 5.21.9​:
  /home/kent/perl5/perlbrew/perls/5.21.8-c/lib/site_perl/5.21.9/x86_64-linux
  /home/kent/perl5/perlbrew/perls/5.21.8-c/lib/site_perl/5.21.9
  /home/kent/perl5/perlbrew/perls/5.21.8-c/lib/5.21.9/x86_64-linux
  /home/kent/perl5/perlbrew/perls/5.21.8-c/lib/5.21.9
  .

Environment for perl 5.21.9​:
  HOME=/home/kent
  LANG (unset)
  LANGUAGE=
  LC_CTYPE=en_NZ.UTF8
  LD_LIBRARY_PATH (unset)
  LOGDIR (unset)
  PATH=/home/kent/perl5/perlbrew/bin​:/home/kent/perl5/perlbrew/perls/5.21.8-c/bin​:/home/kent/.perl6/2013.04/bin​:/home/kent/.gem/ruby/1.8/bin/​:/home/kent/.rvm/gems/ruby-2.1.2/bin​:/home/kent/.rvm/gems/ruby-2.1.2@​global/bin​:/home/kent/.rvm/rubies/ruby-2.1.2/bin​:/usr/local/bin​:/usr/bin​:/bin​:/opt/bin​:/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.2​:/usr/games/bin​:/home/kent/.rvm/bin​:/home/kent/.rvm/bin
  PERLBREW_BASHRC_VERSION=0.72
  PERLBREW_HOME=/home/kent/.perlbrew
  PERLBREW_MANPATH=/home/kent/perl5/perlbrew/perls/5.21.8-c/man
  PERLBREW_PATH=/home/kent/perl5/perlbrew/bin​:/home/kent/perl5/perlbrew/perls/5.21.8-c/bin
  PERLBREW_PERL=5.21.8-c
  PERLBREW_ROOT=/home/kent/perl5/perlbrew
  PERLBREW_VERSION=0.72
  PERL_BADLANG (unset)
  SHELL=/bin/bash

@p5pRT
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p5pRT commented Mar 5, 2015

From @rgarcia

On 5 March 2015 at 14​:28, Kent Fredric <perlbug-followup@​perl.org> wrote​:

Perl 5.20.9​:

perl -e 'while(readline){ print $_ }' 'echo insecure |'
Can't open ls -la |​: No such file or directory at -e line 1.

perl 5.20.0​:

perl -e 'while(readline){ print $_ }' 'echo insecure |'
insecure

Good catch. This should be fixed by 0f6f92e.

More over, deparsing this syntax ( and the <<>> syntax ) returns code that behaves differently to the syntax offered.

---
perl -e 'while(readline){ print $_ }' 'echo insecure |'
Can't open ls -la |​: No such file or directory at -e line 1.

perl -MO=Deparse -e 'while(readline){ print $_ }' 'echo insecure |'
while (defined($_ = <ARGV>)) {
print $_;
}

perl -MO=Deparse -e 'while(<<>>){ print $_ }' 'echo hello |'
while (defined($_ = <ARGV>)) {
print $_;
}

perl -MO=Deparse -e 'while(<>){ print $_ }' 'echo hello |'
while (defined($_ = <ARGV>)) {
print $_;
}

perl -e 'while(defined($_ =<ARGV>)){ print $_ }' 'echo insecure |'
insecure
---

---
Flags​:
category=core
severity=low
---
Site configuration information for perl 5.21.9​:

Configured by kent at Wed Feb 11 00​:16​:37 NZDT 2015.

Summary of my perl5 (revision 5 version 21 subversion 9) configuration​:
Derived from​: 5904c5c
Platform​:
osname=linux, osvers=3.18.3-aufs, archname=x86_64-linux
uname='linux katipo2 3.18.3-aufs #21 smp preempt mon jan 26 09​:49​:29 nzdt 2015 x86_64 intel(r) core(tm) i5-2410m cpu @​ 2.30ghz genuineintel gnulinux '
config_args='-de -Dprefix=/home/kent/perl5/perlbrew/perls/5.21.8-c -Dusecbacktrace -Doptimize=-O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions -Dman1dir=none -Dman3dir=none -Dusedevel -Accflags=-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -Aldflags= -fprofile-use -lbfd -Aeval​:scriptdir=/home/kent/perl5/perlbrew/perls/5.21.8-c/bin'
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler​:
cc='cc', ccflags ='-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong -DUSE_C_BACKTRACE -g -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64',
optimize='-O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions',
cppflags='-DPERL_HASH_FUNC_SDBM -DUSE_C_BACKTRACE_ON_ERROR -fwrapv -fno-strict-aliasing -pipe -fstack-protector-strong'
ccversion='', gccversion='4.9.2', gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678, doublekind=3
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16, longdblkind=3
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t', lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries​:
ld='cc', ldflags =' -fprofile-use -lbfd -fstack-protector-strong -L/usr/local/lib'
libpth=/usr/lib/gcc/x86_64-pc-linux-gnu/4.9.2/include-fixed /usr/lib /usr/local/lib /lib/../lib64 /usr/lib/../lib64 /lib /lib64 /usr/lib64 /usr/local/lib64
libs=-lpthread -lnsl -lnm -lgdbm -ldb -ldl -lm -lcrypt -lutil -lc -lgdbm_compat
perllibs=-lpthread -lnsl -lnm -ldl -lm -lcrypt -lutil -lc
libc=libc-2.20.so, so=so, useshrplib=false, libperl=libperl.a
gnulibc_version='2.20'
Dynamic Linking​:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef, ccdlflags='-Wl,-E'
cccdlflags='-fPIC', lddlflags='-shared -O3 -march=native -mtune=native -g -ggdb3 -fprofile-use -finstrument-functions -L/usr/local/lib -fstack-protector-strong'

Locally applied patches​:
uncommitted-changes

---
@​INC for perl 5.21.9​:
/home/kent/perl5/perlbrew/perls/5.21.8-c/lib/site_perl/5.21.9/x86_64-linux
/home/kent/perl5/perlbrew/perls/5.21.8-c/lib/site_perl/5.21.9
/home/kent/perl5/perlbrew/perls/5.21.8-c/lib/5.21.9/x86_64-linux
/home/kent/perl5/perlbrew/perls/5.21.8-c/lib/5.21.9
.

---
Environment for perl 5.21.9​:
HOME=/home/kent
LANG (unset)
LANGUAGE=
LC_CTYPE=en_NZ.UTF8
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/kent/perl5/perlbrew/bin​:/home/kent/perl5/perlbrew/perls/5.21.8-c/bin​:/home/kent/.perl6/2013.04/bin​:/home/kent/.gem/ruby/1.8/bin/​:/home/kent/.rvm/gems/ruby-2.1.2/bin​:/home/kent/.rvm/gems/ruby-2.1.2@​global/bin​:/home/kent/.rvm/rubies/ruby-2.1.2/bin​:/usr/local/bin​:/usr/bin​:/bin​:/opt/bin​:/usr/x86_64-pc-linux-gnu/gcc-bin/4.9.2​:/usr/games/bin​:/home/kent/.rvm/bin​:/home/kent/.rvm/bin
PERLBREW_BASHRC_VERSION=0.72
PERLBREW_HOME=/home/kent/.perlbrew
PERLBREW_MANPATH=/home/kent/perl5/perlbrew/perls/5.21.8-c/man
PERLBREW_PATH=/home/kent/perl5/perlbrew/bin​:/home/kent/perl5/perlbrew/perls/5.21.8-c/bin
PERLBREW_PERL=5.21.8-c
PERLBREW_ROOT=/home/kent/perl5/perlbrew
PERLBREW_VERSION=0.72
PERL_BADLANG (unset)
SHELL=/bin/bash

@p5pRT
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p5pRT commented Mar 5, 2015

The RT System itself - Status changed from 'new' to 'open'

@p5pRT p5pRT closed this as completed Mar 5, 2015
@p5pRT
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p5pRT commented Mar 5, 2015

@rgs - Status changed from 'open' to 'resolved'

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