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[perl #81016] Document ord("")
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From:
Zsban Ambrus
Date:
December 20, 2010 08:57
Subject:
[perl #81016] Document ord("")
Message ID:
rt-3.6.HEAD-2715-1292847366-149.81016-75-0@perl.org
# New Ticket Created by Zsban Ambrus
# Please include the string: [perl #81016]
# in the subject line of all future correspondence about this issue.
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=81016 >
This is a bug report for perl from ambrus@math.bme.hu,
generated with the help of perlbug 1.39 running under perl 5.12.2.
-----------------------------------------------------------------
[Please describe your issue here]
The following patch clarifies what ord("") does in pod/perlfunc.pod.
>From the current documentation, it's not documented what it does, and one
could guess several different things: returns zero, returns undef, returns
zero with a warning, returns undef with a warning, dies. (There's precedent
for dying: some BASIC implementations give an error if you ask for ASC("")
-- here ASC is their equivalent of our ord function.)
--- perl-5.13.7/pod/perlfunc.pod 2010-12-20 13:06:48.000000000 +0100
+++ perl-5.13.7/pod/perlfunc.pod 2010-12-20 13:08:38.000000000 +0100
@@ -3600,10 +3600,10 @@
=item ord
Returns the numeric (the native 8-bit encoding, like ASCII or EBCDIC,
-or Unicode) value of the first character of EXPR. If EXPR is omitted,
-uses C<$_>.
+or Unicode) value of the first character of EXPR. If EXPR is an empty
+string, returns 0. If EXPR is omitted, uses C<$_>.
For the reverse, see L</chr>.
See L<perlunicode> for more about Unicode.
[Please do not change anything below this line]
-----------------------------------------------------------------
---
Flags:
category=docs
severity=low
---
Site configuration information for perl 5.12.2:
Configured by ambrus at Sat Oct 9 20:40:07 CEST 2010.
Summary of my perl5 (revision 5 version 12 subversion 2) configuration:
Platform:
osname=linux, osvers=2.6.34.1, archname=x86_64-linux
uname='linux king 2.6.34.1 #1 smp sat jul 10 18:21:56 cest 2010
x86_64 gnulinux '
config_args=''
hint=recommended, useposix=true, d_sigaction=define
useithreads=undef, usemultiplicity=undef
useperlio=define, d_sfio=undef, uselargefiles=define, usesocks=undef
use64bitint=define, use64bitall=define, 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='4.5.1', 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='cc', ldflags =' -fstack-protector -L/usr/local/lib'
libpth=/usr/local/lib /lib /usr/lib /lib64 /usr/lib64 /usr/local/lib64
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:
/usr/local/lib/perl5/site_perl/5.12.2/x86_64-linux
/usr/local/lib/perl5/site_perl/5.12.2
/usr/local/lib/perl5/5.12.2/x86_64-linux
/usr/local/lib/perl5/5.12.2
/usr/local/lib/perl5/site_perl/5.12.1/x86_64-linux
/usr/local/lib/perl5/site_perl/5.12.1
/usr/local/lib/perl5/site_perl/5.12.0/x86_64-linux
/usr/local/lib/perl5/site_perl/5.12.0
/usr/local/lib/perl5/site_perl
.
---
Environment for perl 5.12.2:
HOME=/home/ambrus
LANG (unset)
LANGUAGE (unset)
LC_CTYPE=hu_HU
LD_LIBRARY_PATH=/home/ambrus/local/lib/
LOGDIR (unset)
PATH=/home/ambrus/local/bin:/usr/local/bin:/usr/bin:/bin:/usr/bin/X11:/usr/games
PERL_BADLANG (unset)
SHELL=/usr/local/bin/bash
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[perl #81016] Document ord("")
by Zsban Ambrus