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[perl #79956] %zd format in printf
From:
Ed Avis
Date:
November 29, 2010 10:17
Subject:
[perl #79956] %zd format in printf
Message ID:
rt-3.6.HEAD-13564-1291046416-1111.79956-75-0@perl.org
# New Ticket Created by "Ed Avis"
# Please include the string: [perl #79956]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=79956 >
This is a bug report for perl from eda@waniasset.com,
generated with the help of perlbug 1.36 running under perl 5.10.0.
-----------------------------------------------------------------
[Please enter your report here]
The system C library printf() on this system supports a 'z' format
modifier:
z A following integer conversion corresponds to a
size_t or
ssize_t argument.
So in C you can say
size_t x = sizeof(int); printf("%zd", x);
This is useful because a size_t might not fit into an int, so using
plain
%d is not right.
As wishlist items could I ask about a few things:
- Please consider adding support for this z format modifier. In perl
you
don't have size_t or integer overflow, but it would not hurt to allow
it
to help porting C code.
- If an unrecognized format string is used, shouldn't printf() give a
warning?
- In XS code, it would be useful for newSVpvf() to support it.
And again if XS code uses an unrecognized format character should this
not produce a warning?
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=core
severity=wishlist
---
This perlbug was built using Perl 5.10.0 in the Fedora build system.
It is being executed now by Perl 5.10.0 - Tue Oct 12 16:07:05 UTC 2010.
Site configuration information for perl 5.10.0:
Configured by Red Hat, Inc. at Tue Oct 12 16:07:05 UTC 2010.
Summary of my perl5 (revision 5 version 10 subversion 0) configuration:
Platform:
osname=linux, osvers=2.6.32-72.el6.bz634452.x86_64,
archname=x86_64-linux-thread-multi
uname='linux x86-05.phx2.fedoraproject.org
2.6.32-72.el6.bz634452.x86_64 #1 smp fri sep 17 06:52:25 edt 2010 x86_64
x86_64 x86_64 gnulinux '
config_args='-des -Doptimize=-O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic
-Accflags=-DPERL_USE_SAFE_PUTENV -Dccdlflags=-Wl,--enable-new-dtags
-Dversion=5.10.0 -Dmyhostname=localhost -Dperladmin=root@localhost
-Dcc=gcc -Dcf_by=Red Hat, Inc. -Dprefix=/usr -Dvendorprefix=/usr
-Dsiteprefix=/usr/local -Dprivlib=/usr/lib/perl5/5.10.0
-Dsitelib=/usr/local/lib/perl5/site_perl/5.10.0
-Dvendorlib=/usr/lib/perl5/vendor_perl/5.10.0
-Darchlib=/usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi
-Dsitearch=/usr/local/lib64/perl5/site_perl/5.10.0/x86_64-linux-thread-m
ulti
-Dvendorarch=/usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-mul
ti -Dinc_version_list=none -Darchname=x86_64-linux-thread-multi
-Dlibpth=/usr/local/lib64 /lib64 /usr/lib64 -Duseshrplib -Dusethreads
-Duseithreads -Duselargefiles -Dd_dosuid -Dd_semctl_semun -Di_db
-Ui_ndbm -Di_gdbm -Di_shadow -Di_syslog -Dman3ext=3pm -Duseperlio
-Dinstallusrbinperl=n -Ubincompat5005 -Uversiononly
-Dpager=/usr/bin/less -isr -Dd_gethostent_r_proto -Ud_endhostent_r_proto
-Ud_sethostent_r_proto -Ud_endprotoent_r_proto -Ud_setprotoent_r_proto
-Ud_endservent_r_proto -Ud_setservent_r_proto -Dscriptdir=/usr/bin
-Dotherlibdirs=/usr/lib/perl5/site_perl'
hint=recommended, useposix=true, d_sigaction=define
useithreads=define, usemultiplicity=define
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, uselongdouble=undef
usemymalloc=n, bincompat5005=undef
Compiler:
cc='gcc', ccflags ='-D_REENTRANT -D_GNU_SOURCE
-DPERL_USE_SAFE_PUTENV -DDEBUGGING -fno-strict-aliasing -pipe
-I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64
-I/usr/include/gdbm',
optimize='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic',
cppflags='-D_REENTRANT -D_GNU_SOURCE -DPERL_USE_SAFE_PUTENV
-DDEBUGGING -fno-strict-aliasing -pipe -I/usr/local/include
-I/usr/include/gdbm'
ccversion='', gccversion='4.4.4 20100630 (Red Hat 4.4.4-10)',
gccosandvers=''
intsize=4, longsize=8, ptrsize=8, doublesize=8, byteorder=12345678
d_longlong=define, longlongsize=8, d_longdbl=define, longdblsize=16
ivtype='long', ivsize=8, nvtype='double', nvsize=8, Off_t='off_t',
lseeksize=8
alignbytes=8, prototype=define
Linker and Libraries:
ld='gcc', ldflags =''
libpth=/usr/local/lib64 /lib64 /usr/lib64
libs=-lresolv -lnsl -lgdbm -ldb -ldl -lm -lcrypt -lutil -lpthread
-lc
perllibs=-lresolv -lnsl -ldl -lm -lcrypt -lutil -lpthread -lc
libc=, so=so, useshrplib=true, libperl=libperl.so
gnulibc_version='2.11.2'
Dynamic Linking:
dlsrc=dl_dlopen.xs, dlext=so, d_dlsymun=undef,
ccdlflags='-Wl,--enable-new-dtags
-Wl,-rpath,/usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi/CORE'
cccdlflags='-fPIC', lddlflags='-shared -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic'
Locally applied patches:
---
@INC for perl 5.10.0:
/home/eda/lib/perl5/5.10.0
/home/eda/lib/perl5/site_perl/5.10.0
/usr/local/lib64/perl5/site_perl/5.10.0/x86_64-linux-thread-multi
/usr/local/lib/perl5/site_perl/5.10.0
/usr/lib64/perl5/vendor_perl/5.10.0/x86_64-linux-thread-multi
/usr/lib/perl5/vendor_perl/5.10.0
/usr/lib/perl5/vendor_perl
/usr/lib64/perl5/5.10.0/x86_64-linux-thread-multi
/usr/lib/perl5/5.10.0
/usr/lib/perl5/site_perl/5.10.0
/usr/lib/perl5/site_perl
.
---
Environment for perl 5.10.0:
HOME=/home/eda
LANG=en_GB.UTF-8
LANGUAGE (unset)
LC_COLLATE=C
LC_CTYPE=en_GB.UTF-8
LC_MESSAGES=en_GB.UTF-8
LC_MONETARY=en_GB.UTF-8
LC_NUMERIC=en_GB.UTF-8
LC_TIME=en_GB.UTF-8
LD_LIBRARY_PATH (unset)
LOGDIR (unset)
PATH=/home/eda/bin:/home/eda/bin:/usr/lib64/qt-3.3/bin:/usr/kerberos/sbi
n:/usr/kerberos/bin:/usr/lib64/ccache:/usr/local/bin:/bin:/usr/bin:/usr/
local/sbin:/usr/sbin:/sbin:/sbin:/usr/sbin:/home/eda/bin:/sbin:/usr/sbin
PERL5LIB=/home/eda/lib/perl5/5.10.0:/home/eda/lib/perl5/site_perl/5.10.0
PERL_BADLANG (unset)
SHELL=/bin/bash
--
Ed Avis <eda@waniasset.com>
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