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=head1 NAME
perllocale - Perl locale handling (internationalization and localization)
=head1 DESCRIPTION
Perl supports language-specific notions of data such as "is this
a letter", "what is the uppercase equivalent of this letter", and
"which of these letters comes first". These are important issues,
especially for languages other than English--but also for English: it
would be naE<iuml>ve to imagine that C<A-Za-z> defines all the "letters"
needed to write in English. Perl is also aware that some character other
than '.' may be preferred as a decimal point, and that output date
representations may be language-specific. The process of making an
application take account of its users' preferences in such matters is
called B<internationalization> (often abbreviated as B<i18n>); telling
such an application about a particular set of preferences is known as
B<localization> (B<l10n>).
Perl can understand language-specific data via the standardized (ISO C,
XPG4, POSIX 1.c) method called "the locale system". The locale system is
controlled per application using one pragma, one function call, and
several environment variables.
B<NOTE>: This feature is new in Perl 5.004, and does not apply unless an
application specifically requests it--see L<Backward compatibility>.
The one exception is that write() now B<always> uses the current locale
- see L<"NOTES">.
=head1 PREPARING TO USE LOCALES
If Perl applications are to understand and present your data
correctly according a locale of your choice, B<all> of the following
must be true:
=over 4
=item *
B<Your operating system must support the locale system>. If it does,
you should find that the setlocale() function is a documented part of
its C library.
=item *
B<Definitions for locales that you use must be installed>. You, or
your system administrator, must make sure that this is the case. The
available locales, the location in which they are kept, and the manner
in which they are installed all vary from system to system. Some systems
provide only a few, hard-wired locales and do not allow more to be
added. Others allow you to add "canned" locales provided by the system
supplier. Still others allow you or the system administrator to define
and add arbitrary locales. (You may have to ask your supplier to
provide canned locales that are not delivered with your operating
system.) Read your system documentation for further illumination.
=item *
B<Perl must believe that the locale system is supported>. If it does,
C<perl -V:d_setlocale> will say that the value for C<d_setlocale> is
C<define>.
=back
If you want a Perl application to process and present your data
according to a particular locale, the application code should include
the S<C<use locale>> pragma (see L<The use locale pragma>) where
appropriate, and B<at least one> of the following must be true:
=over 4
=item *
B<The locale-determining environment variables (see L<"ENVIRONMENT">)
must be correctly set up> at the time the application is started, either
by yourself or by whoever set up your system account.
=item *
B<The application must set its own locale> using the method described in
L<The setlocale function>.
=back
=head1 USING LOCALES
=head2 The use locale pragma
By default, Perl ignores the current locale. The S<C<use locale>>
pragma tells Perl to use the current locale for some operations:
=over 4
=item *
B<The comparison operators> (C<lt>, C<le>, C<cmp>, C<ge>, and C<gt>) and
the POSIX string collation functions strcoll() and strxfrm() use
C<LC_COLLATE>. sort() is also affected if used without an
explicit comparison function, because it uses C<cmp> by default.
B<Note:> C<eq> and C<ne> are unaffected by locale: they always
perform a char-by-char comparison of their scalar operands. What's
more, if C<cmp> finds that its operands are equal according to the
collation sequence specified by the current locale, it goes on to
perform a char-by-char comparison, and only returns I<0> (equal) if the
operands are char-for-char identical. If you really want to know whether
two strings--which C<eq> and C<cmp> may consider different--are equal
as far as collation in the locale is concerned, see the discussion in
L<Category LC_COLLATE: Collation>.
=item *
B<Regular expressions and case-modification functions> (uc(), lc(),
ucfirst(), and lcfirst()) use C<LC_CTYPE>
=item *
B<The formatting functions> (printf(), sprintf() and write()) use
C<LC_NUMERIC>
=item *
B<The POSIX date formatting function> (strftime()) uses C<LC_TIME>.
=back
C<LC_COLLATE>, C<LC_CTYPE>, and so on, are discussed further in
L<LOCALE CATEGORIES>.
The default behavior is restored with the S<C<no locale>> pragma, or
upon reaching the end of block enclosing C<use locale>.
The string result of any operation that uses locale
information is tainted, as it is possible for a locale to be
untrustworthy. See L<"SECURITY">.
=head2 The setlocale function
You can switch locales as often as you wish at run time with the
POSIX::setlocale() function:
# This functionality not usable prior to Perl 5.004
require 5.004;
# Import locale-handling tool set from POSIX module.
# This example uses: setlocale -- the function call
# LC_CTYPE -- explained below
use POSIX qw(locale_h);
# query and save the old locale
$old_locale = setlocale(LC_CTYPE);
setlocale(LC_CTYPE, "fr_CA.ISO8859-1");
# LC_CTYPE now in locale "French, Canada, codeset ISO 8859-1"
setlocale(LC_CTYPE, "");
# LC_CTYPE now reset to default defined by LC_ALL/LC_CTYPE/LANG
# environment variables. See below for documentation.
# restore the old locale
setlocale(LC_CTYPE, $old_locale);
The first argument of setlocale() gives the B<category>, the second the
B<locale>. The category tells in what aspect of data processing you
want to apply locale-specific rules. Category names are discussed in
L<LOCALE CATEGORIES> and L<"ENVIRONMENT">. The locale is the name of a
collection of customization information corresponding to a particular
combination of language, country or territory, and codeset. Read on for
hints on the naming of locales: not all systems name locales as in the
example.
If no second argument is provided and the category is something else
than LC_ALL, the function returns a string naming the current locale
for the category. You can use this value as the second argument in a
subsequent call to setlocale().
If no second argument is provided and the category is LC_ALL, the
result is implementation-dependent. It may be a string of
concatenated locales names (separator also implementation-dependent)
or a single locale name. Please consult your setlocale(3) man page for
details.
If a second argument is given and it corresponds to a valid locale,
the locale for the category is set to that value, and the function
returns the now-current locale value. You can then use this in yet
another call to setlocale(). (In some implementations, the return
value may sometimes differ from the value you gave as the second
argument--think of it as an alias for the value you gave.)
As the example shows, if the second argument is an empty string, the
category's locale is returned to the default specified by the
corresponding environment variables. Generally, this results in a
return to the default that was in force when Perl started up: changes
to the environment made by the application after startup may or may not
be noticed, depending on your system's C library.
If the second argument does not correspond to a valid locale, the locale
for the category is not changed, and the function returns I<undef>.
For further information about the categories, consult setlocale(3).
=head2 Finding locales
For locales available in your system, consult also setlocale(3) to
see whether it leads to the list of available locales (search for the
I<SEE ALSO> section). If that fails, try the following command lines:
locale -a
nlsinfo
ls /usr/lib/nls/loc
ls /usr/lib/locale
ls /usr/lib/nls
ls /usr/share/locale
and see whether they list something resembling these
en_US.ISO8859-1 de_DE.ISO8859-1 ru_RU.ISO8859-5
en_US.iso88591 de_DE.iso88591 ru_RU.iso88595
en_US de_DE ru_RU
en de ru
english german russian
english.iso88591 german.iso88591 russian.iso88595
english.roman8 russian.koi8r
Sadly, even though the calling interface for setlocale() has been
standardized, names of locales and the directories where the
configuration resides have not been. The basic form of the name is
I<language_territory>B<.>I<codeset>, but the latter parts after
I<language> are not always present. The I<language> and I<country>
are usually from the standards B<ISO 3166> and B<ISO 639>, the
two-letter abbreviations for the countries and the languages of the
world, respectively. The I<codeset> part often mentions some B<ISO
8859> character set, the Latin codesets. For example, C<ISO 8859-1>
is the so-called "Western European codeset" that can be used to encode
most Western European languages adequately. Again, there are several
ways to write even the name of that one standard. Lamentably.
Two special locales are worth particular mention: "C" and "POSIX".
Currently these are effectively the same locale: the difference is
mainly that the first one is defined by the C standard, the second by
the POSIX standard. They define the B<default locale> in which
every program starts in the absence of locale information in its
environment. (The I<default> default locale, if you will.) Its language
is (American) English and its character codeset ASCII.
B<NOTE>: Not all systems have the "POSIX" locale (not all systems are
POSIX-conformant), so use "C" when you need explicitly to specify this
default locale.
=head2 LOCALE PROBLEMS
You may encounter the following warning message at Perl startup:
perl: warning: Setting locale failed.
perl: warning: Please check that your locale settings:
LC_ALL = "En_US",
LANG = (unset)
are supported and installed on your system.
perl: warning: Falling back to the standard locale ("C").
This means that your locale settings had LC_ALL set to "En_US" and
LANG exists but has no value. Perl tried to believe you but could not.
Instead, Perl gave up and fell back to the "C" locale, the default locale
that is supposed to work no matter what. This usually means your locale
settings were wrong, they mention locales your system has never heard
of, or the locale installation in your system has problems (for example,
some system files are broken or missing). There are quick and temporary
fixes to these problems, as well as more thorough and lasting fixes.
=head2 Temporarily fixing locale problems
The two quickest fixes are either to render Perl silent about any
locale inconsistencies or to run Perl under the default locale "C".
Perl's moaning about locale problems can be silenced by setting the
environment variable PERL_BADLANG to a zero value, for example "0".
This method really just sweeps the problem under the carpet: you tell
Perl to shut up even when Perl sees that something is wrong. Do not
be surprised if later something locale-dependent misbehaves.
Perl can be run under the "C" locale by setting the environment
variable LC_ALL to "C". This method is perhaps a bit more civilized
than the PERL_BADLANG approach, but setting LC_ALL (or
other locale variables) may affect other programs as well, not just
Perl. In particular, external programs run from within Perl will see
these changes. If you make the new settings permanent (read on), all
programs you run see the changes. See L<"ENVIRONMENT"> for
the full list of relevant environment variables and L<USING LOCALES>
for their effects in Perl. Effects in other programs are
easily deducible. For example, the variable LC_COLLATE may well affect
your B<sort> program (or whatever the program that arranges "records"
alphabetically in your system is called).
You can test out changing these variables temporarily, and if the
new settings seem to help, put those settings into your shell startup
files. Consult your local documentation for the exact details. For in
Bourne-like shells (B<sh>, B<ksh>, B<bash>, B<zsh>):
LC_ALL=en_US.ISO8859-1
export LC_ALL
This assumes that we saw the locale "en_US.ISO8859-1" using the commands
discussed above. We decided to try that instead of the above faulty
locale "En_US"--and in Cshish shells (B<csh>, B<tcsh>)
setenv LC_ALL en_US.ISO8859-1
or if you have the "env" application you can do in any shell
env LC_ALL=en_US.ISO8859-1 perl ...
If you do not know what shell you have, consult your local
helpdesk or the equivalent.
=head2 Permanently fixing locale problems
The slower but superior fixes are when you may be able to yourself
fix the misconfiguration of your own environment variables. The
mis(sing)configuration of the whole system's locales usually requires
the help of your friendly system administrator.
First, see earlier in this document about L<Finding locales>. That tells
how to find which locales are really supported--and more importantly,
installed--on your system. In our example error message, environment
variables affecting the locale are listed in the order of decreasing
importance (and unset variables do not matter). Therefore, having
LC_ALL set to "En_US" must have been the bad choice, as shown by the
error message. First try fixing locale settings listed first.
Second, if using the listed commands you see something B<exactly>
(prefix matches do not count and case usually counts) like "En_US"
without the quotes, then you should be okay because you are using a
locale name that should be installed and available in your system.
In this case, see L<Permanently fixing your system's locale configuration>.
=head2 Permanently fixing your system's locale configuration
This is when you see something like:
perl: warning: Please check that your locale settings:
LC_ALL = "En_US",
LANG = (unset)
are supported and installed on your system.
but then cannot see that "En_US" listed by the above-mentioned
commands. You may see things like "en_US.ISO8859-1", but that isn't
the same. In this case, try running under a locale
that you can list and which somehow matches what you tried. The
rules for matching locale names are a bit vague because
standardization is weak in this area. See again the
L<Finding locales> about general rules.
=head2 Fixing system locale configuration
Contact a system administrator (preferably your own) and report the exact
error message you get, and ask them to read this same documentation you
are now reading. They should be able to check whether there is something
wrong with the locale configuration of the system. The L<Finding locales>
section is unfortunately a bit vague about the exact commands and places
because these things are not that standardized.
=head2 The localeconv function
The POSIX::localeconv() function allows you to get particulars of the
locale-dependent numeric formatting information specified by the current
C<LC_NUMERIC> and C<LC_MONETARY> locales. (If you just want the name of
the current locale for a particular category, use POSIX::setlocale()
with a single parameter--see L<The setlocale function>.)
use POSIX qw(locale_h);
# Get a reference to a hash of locale-dependent info
$locale_values = localeconv();
# Output sorted list of the values
for (sort keys %$locale_values) {
printf "%-20s = %s\n", $_, $locale_values->{$_}
}
localeconv() takes no arguments, and returns B<a reference to> a hash.
The keys of this hash are variable names for formatting, such as
C<decimal_point> and C<thousands_sep>. The values are the
corresponding, er, values. See L<POSIX/localeconv> for a longer
example listing the categories an implementation might be expected to
provide; some provide more and others fewer. You don't need an
explicit C<use locale>, because localeconv() always observes the
current locale.
Here's a simple-minded example program that rewrites its command-line
parameters as integers correctly formatted in the current locale:
# See comments in previous example
require 5.004;
use POSIX qw(locale_h);
# Get some of locale's numeric formatting parameters
my ($thousands_sep, $grouping) =
@{localeconv()}{'thousands_sep', 'grouping'};
# Apply defaults if values are missing
$thousands_sep = ',' unless $thousands_sep;
# grouping and mon_grouping are packed lists
# of small integers (characters) telling the
# grouping (thousand_seps and mon_thousand_seps
# being the group dividers) of numbers and
# monetary quantities. The integers' meanings:
# 255 means no more grouping, 0 means repeat
# the previous grouping, 1-254 means use that
# as the current grouping. Grouping goes from
# right to left (low to high digits). In the
# below we cheat slightly by never using anything
# else than the first grouping (whatever that is).
if ($grouping) {
@grouping = unpack("C*", $grouping);
} else {
@grouping = (3);
}
# Format command line params for current locale
for (@ARGV) {
$_ = int; # Chop non-integer part
1 while
s/(\d)(\d{$grouping[0]}($|$thousands_sep))/$1$thousands_sep$2/;
print "$_";
}
print "\n";
=head2 I18N::Langinfo
Another interface for querying locale-dependent information is the
I18N::Langinfo::langinfo() function, available at least in UNIX-like
systems and VMS.
The following example will import the langinfo() function itself and
three constants to be used as arguments to langinfo(): a constant for
the abbreviated first day of the week (the numbering starts from
Sunday = 1) and two more constants for the affirmative and negative
answers for a yes/no question in the current locale.
use I18N::Langinfo qw(langinfo ABDAY_1 YESSTR NOSTR);
my ($abday_1, $yesstr, $nostr) = map { langinfo } qw(ABDAY_1 YESSTR NOSTR);
print "$abday_1? [$yesstr/$nostr] ";
In other words, in the "C" (or English) locale the above will probably
print something like:
Sun? [yes/no]
See L<I18N::Langinfo> for more information.
=head1 LOCALE CATEGORIES
The following subsections describe basic locale categories. Beyond these,
some combination categories allow manipulation of more than one
basic category at a time. See L<"ENVIRONMENT"> for a discussion of these.
=head2 Category LC_COLLATE: Collation
In the scope of S<C<use locale>>, Perl looks to the C<LC_COLLATE>
environment variable to determine the application's notions on collation
(ordering) of characters. For example, 'b' follows 'a' in Latin
alphabets, but where do 'E<aacute>' and 'E<aring>' belong? And while
'color' follows 'chocolate' in English, what about in Spanish?
The following collations all make sense and you may meet any of them
if you "use locale".
A B C D E a b c d e
A a B b C c D d E e
a A b B c C d D e E
a b c d e A B C D E
Here is a code snippet to tell what "word"
characters are in the current locale, in that locale's order:
use locale;
print +(sort grep /\w/, map { chr } 0..255), "\n";
Compare this with the characters that you see and their order if you
state explicitly that the locale should be ignored:
no locale;
print +(sort grep /\w/, map { chr } 0..255), "\n";
This machine-native collation (which is what you get unless S<C<use
locale>> has appeared earlier in the same block) must be used for
sorting raw binary data, whereas the locale-dependent collation of the
first example is useful for natural text.
As noted in L<USING LOCALES>, C<cmp> compares according to the current
collation locale when C<use locale> is in effect, but falls back to a
char-by-char comparison for strings that the locale says are equal. You
can use POSIX::strcoll() if you don't want this fall-back:
use POSIX qw(strcoll);
$equal_in_locale =
!strcoll("space and case ignored", "SpaceAndCaseIgnored");
$equal_in_locale will be true if the collation locale specifies a
dictionary-like ordering that ignores space characters completely and
which folds case.
If you have a single string that you want to check for "equality in
locale" against several others, you might think you could gain a little
efficiency by using POSIX::strxfrm() in conjunction with C<eq>:
use POSIX qw(strxfrm);
$xfrm_string = strxfrm("Mixed-case string");
print "locale collation ignores spaces\n"
if $xfrm_string eq strxfrm("Mixed-casestring");
print "locale collation ignores hyphens\n"
if $xfrm_string eq strxfrm("Mixedcase string");
print "locale collation ignores case\n"
if $xfrm_string eq strxfrm("mixed-case string");
strxfrm() takes a string and maps it into a transformed string for use
in char-by-char comparisons against other transformed strings during
collation. "Under the hood", locale-affected Perl comparison operators
call strxfrm() for both operands, then do a char-by-char
comparison of the transformed strings. By calling strxfrm() explicitly
and using a non locale-affected comparison, the example attempts to save
a couple of transformations. But in fact, it doesn't save anything: Perl
magic (see L<perlguts/Magic Variables>) creates the transformed version of a
string the first time it's needed in a comparison, then keeps this version around
in case it's needed again. An example rewritten the easy way with
C<cmp> runs just about as fast. It also copes with null characters
embedded in strings; if you call strxfrm() directly, it treats the first
null it finds as a terminator. don't expect the transformed strings
it produces to be portable across systems--or even from one revision
of your operating system to the next. In short, don't call strxfrm()
directly: let Perl do it for you.
Note: C<use locale> isn't shown in some of these examples because it isn't
needed: strcoll() and strxfrm() exist only to generate locale-dependent
results, and so always obey the current C<LC_COLLATE> locale.
=head2 Category LC_CTYPE: Character Types
In the scope of S<C<use locale>>, Perl obeys the C<LC_CTYPE> locale
setting. This controls the application's notion of which characters are
alphabetic. This affects Perl's C<\w> regular expression metanotation,
which stands for alphanumeric characters--that is, alphabetic,
numeric, and including other special characters such as the underscore or
hyphen. (Consult L<perlre> for more information about
regular expressions.) Thanks to C<LC_CTYPE>, depending on your locale
setting, characters like 'E<aelig>', 'E<eth>', 'E<szlig>', and
'E<oslash>' may be understood as C<\w> characters.
The C<LC_CTYPE> locale also provides the map used in transliterating
characters between lower and uppercase. This affects the case-mapping
functions--lc(), lcfirst, uc(), and ucfirst(); case-mapping
interpolation with C<\l>, C<\L>, C<\u>, or C<\U> in double-quoted strings
and C<s///> substitutions; and case-independent regular expression
pattern matching using the C<i> modifier.
Finally, C<LC_CTYPE> affects the POSIX character-class test
functions--isalpha(), islower(), and so on. For example, if you move
from the "C" locale to a 7-bit Scandinavian one, you may find--possibly
to your surprise--that "|" moves from the ispunct() class to isalpha().
B<Note:> A broken or malicious C<LC_CTYPE> locale definition may result
in clearly ineligible characters being considered to be alphanumeric by
your application. For strict matching of (mundane) letters and
digits--for example, in command strings--locale-aware applications
should use C<\w> inside a C<no locale> block. See L<"SECURITY">.
=head2 Category LC_NUMERIC: Numeric Formatting
After a proper POSIX::setlocale() call, Perl obeys the C<LC_NUMERIC>
locale information, which controls an application's idea of how numbers
should be formatted for human readability by the printf(), sprintf(), and
write() functions. String-to-numeric conversion by the POSIX::strtod()
function is also affected. In most implementations the only effect is to
change the character used for the decimal point--perhaps from '.' to ','.
These functions aren't aware of such niceties as thousands separation and
so on. (See L<The localeconv function> if you care about these things.)
Output produced by print() is also affected by the current locale: it
corresponds to what you'd get from printf() in the "C" locale. The
same is true for Perl's internal conversions between numeric and
string formats:
use POSIX qw(strtod setlocale LC_NUMERIC);
setlocale LC_NUMERIC, "";
$n = 5/2; # Assign numeric 2.5 to $n
$a = " $n"; # Locale-dependent conversion to string
print "half five is $n\n"; # Locale-dependent output
printf "half five is %g\n", $n; # Locale-dependent output
print "DECIMAL POINT IS COMMA\n"
if $n == (strtod("2,5"))[0]; # Locale-dependent conversion
See also L<I18N::Langinfo> and C<RADIXCHAR>.
=head2 Category LC_MONETARY: Formatting of monetary amounts
The C standard defines the C<LC_MONETARY> category, but no function
that is affected by its contents. (Those with experience of standards
committees will recognize that the working group decided to punt on the
issue.) Consequently, Perl takes no notice of it. If you really want
to use C<LC_MONETARY>, you can query its contents--see
L<The localeconv function>--and use the information that it returns in your
application's own formatting of currency amounts. However, you may well
find that the information, voluminous and complex though it may be, still
does not quite meet your requirements: currency formatting is a hard nut
to crack.
See also L<I18N::Langinfo> and C<CRNCYSTR>.
=head2 LC_TIME
Output produced by POSIX::strftime(), which builds a formatted
human-readable date/time string, is affected by the current C<LC_TIME>
locale. Thus, in a French locale, the output produced by the C<%B>
format element (full month name) for the first month of the year would
be "janvier". Here's how to get a list of long month names in the
current locale:
use POSIX qw(strftime);
for (0..11) {
$long_month_name[$_] =
strftime("%B", 0, 0, 0, 1, $_, 96);
}
Note: C<use locale> isn't needed in this example: as a function that
exists only to generate locale-dependent results, strftime() always
obeys the current C<LC_TIME> locale.
See also L<I18N::Langinfo> and C<ABDAY_1>..C<ABDAY_7>, C<DAY_1>..C<DAY_7>,
C<ABMON_1>..C<ABMON_12>, and C<ABMON_1>..C<ABMON_12>.
=head2 Other categories
The remaining locale category, C<LC_MESSAGES> (possibly supplemented
by others in particular implementations) is not currently used by
Perl--except possibly to affect the behavior of library functions
called by extensions outside the standard Perl distribution and by the
operating system and its utilities. Note especially that the string
value of C<$!> and the error messages given by external utilities may
be changed by C<LC_MESSAGES>. If you want to have portable error
codes, use C<%!>. See L<Errno>.
=head1 SECURITY
Although the main discussion of Perl security issues can be found in
L<perlsec>, a discussion of Perl's locale handling would be incomplete
if it did not draw your attention to locale-dependent security issues.
Locales--particularly on systems that allow unprivileged users to
build their own locales--are untrustworthy. A malicious (or just plain
broken) locale can make a locale-aware application give unexpected
results. Here are a few possibilities:
=over 4
=item *
Regular expression checks for safe file names or mail addresses using
C<\w> may be spoofed by an C<LC_CTYPE> locale that claims that
characters such as "E<gt>" and "|" are alphanumeric.
=item *
String interpolation with case-mapping, as in, say, C<$dest =
"C:\U$name.$ext">, may produce dangerous results if a bogus LC_CTYPE
case-mapping table is in effect.
=item *
A sneaky C<LC_COLLATE> locale could result in the names of students with
"D" grades appearing ahead of those with "A"s.
=item *
An application that takes the trouble to use information in
C<LC_MONETARY> may format debits as if they were credits and vice versa
if that locale has been subverted. Or it might make payments in US
dollars instead of Hong Kong dollars.
=item *
The date and day names in dates formatted by strftime() could be
manipulated to advantage by a malicious user able to subvert the
C<LC_DATE> locale. ("Look--it says I wasn't in the building on
Sunday.")
=back
Such dangers are not peculiar to the locale system: any aspect of an
application's environment which may be modified maliciously presents
similar challenges. Similarly, they are not specific to Perl: any
programming language that allows you to write programs that take
account of their environment exposes you to these issues.
Perl cannot protect you from all possibilities shown in the
examples--there is no substitute for your own vigilance--but, when
C<use locale> is in effect, Perl uses the tainting mechanism (see
L<perlsec>) to mark string results that become locale-dependent, and
which may be untrustworthy in consequence. Here is a summary of the
tainting behavior of operators and functions that may be affected by
the locale:
=over 4
=item *
B<Comparison operators> (C<lt>, C<le>, C<ge>, C<gt> and C<cmp>):
Scalar true/false (or less/equal/greater) result is never tainted.
=item *
B<Case-mapping interpolation> (with C<\l>, C<\L>, C<\u> or C<\U>)
Result string containing interpolated material is tainted if
C<use locale> is in effect.
=item *
B<Matching operator> (C<m//>):
Scalar true/false result never tainted.
Subpatterns, either delivered as a list-context result or as $1 etc.
are tainted if C<use locale> is in effect, and the subpattern regular
expression contains C<\w> (to match an alphanumeric character), C<\W>
(non-alphanumeric character), C<\s> (whitespace character), or C<\S>
(non whitespace character). The matched-pattern variable, $&, $`
(pre-match), $' (post-match), and $+ (last match) are also tainted if
C<use locale> is in effect and the regular expression contains C<\w>,
C<\W>, C<\s>, or C<\S>.
=item *
B<Substitution operator> (C<s///>):
Has the same behavior as the match operator. Also, the left
operand of C<=~> becomes tainted when C<use locale> in effect
if modified as a result of a substitution based on a regular
expression match involving C<\w>, C<\W>, C<\s>, or C<\S>; or of
case-mapping with C<\l>, C<\L>,C<\u> or C<\U>.
=item *
B<Output formatting functions> (printf() and write()):
Results are never tainted because otherwise even output from print,
for example C<print(1/7)>, should be tainted if C<use locale> is in
effect.
=item *
B<Case-mapping functions> (lc(), lcfirst(), uc(), ucfirst()):
Results are tainted if C<use locale> is in effect.
=item *
B<POSIX locale-dependent functions> (localeconv(), strcoll(),
strftime(), strxfrm()):
Results are never tainted.
=item *
B<POSIX character class tests> (isalnum(), isalpha(), isdigit(),
isgraph(), islower(), isprint(), ispunct(), isspace(), isupper(),
isxdigit()):
True/false results are never tainted.
=back
Three examples illustrate locale-dependent tainting.
The first program, which ignores its locale, won't run: a value taken
directly from the command line may not be used to name an output file
when taint checks are enabled.
#/usr/local/bin/perl -T
# Run with taint checking
# Command line sanity check omitted...
$tainted_output_file = shift;
open(F, ">$tainted_output_file")
or warn "Open of $untainted_output_file failed: $!\n";
The program can be made to run by "laundering" the tainted value through
a regular expression: the second example--which still ignores locale
information--runs, creating the file named on its command line
if it can.
#/usr/local/bin/perl -T
$tainted_output_file = shift;
$tainted_output_file =~ m%[\w/]+%;
$untainted_output_file = $&;
open(F, ">$untainted_output_file")
or warn "Open of $untainted_output_file failed: $!\n";
Compare this with a similar but locale-aware program:
#/usr/local/bin/perl -T
$tainted_output_file = shift;
use locale;
$tainted_output_file =~ m%[\w/]+%;
$localized_output_file = $&;
open(F, ">$localized_output_file")
or warn "Open of $localized_output_file failed: $!\n";
This third program fails to run because $& is tainted: it is the result
of a match involving C<\w> while C<use locale> is in effect.
=head1 ENVIRONMENT
=over 12
=item PERL_BADLANG
A string that can suppress Perl's warning about failed locale settings
at startup. Failure can occur if the locale support in the operating
system is lacking (broken) in some way--or if you mistyped the name of
a locale when you set up your environment. If this environment
variable is absent, or has a value that does not evaluate to integer
zero--that is, "0" or ""-- Perl will complain about locale setting
failures.
B<NOTE>: PERL_BADLANG only gives you a way to hide the warning message.
The message tells about some problem in your system's locale support,
and you should investigate what the problem is.
=back
The following environment variables are not specific to Perl: They are
part of the standardized (ISO C, XPG4, POSIX 1.c) setlocale() method
for controlling an application's opinion on data.
=over 12
=item LC_ALL
C<LC_ALL> is the "override-all" locale environment variable. If
set, it overrides all the rest of the locale environment variables.
=item LANGUAGE
B<NOTE>: C<LANGUAGE> is a GNU extension, it affects you only if you
are using the GNU libc. This is the case if you are using e.g. Linux.
If you are using "commercial" UNIXes you are most probably I<not>
using GNU libc and you can ignore C<LANGUAGE>.
However, in the case you are using C<LANGUAGE>: it affects the
language of informational, warning, and error messages output by
commands (in other words, it's like C<LC_MESSAGES>) but it has higher
priority than L<LC_ALL>. Moreover, it's not a single value but
instead a "path" (":"-separated list) of I<languages> (not locales).
See the GNU C<gettext> library documentation for more information.
=item LC_CTYPE
In the absence of C<LC_ALL>, C<LC_CTYPE> chooses the character type
locale. In the absence of both C<LC_ALL> and C<LC_CTYPE>, C<LANG>
chooses the character type locale.
=item LC_COLLATE
In the absence of C<LC_ALL>, C<LC_COLLATE> chooses the collation
(sorting) locale. In the absence of both C<LC_ALL> and C<LC_COLLATE>,
C<LANG> chooses the collation locale.
=item LC_MONETARY
In the absence of C<LC_ALL>, C<LC_MONETARY> chooses the monetary
formatting locale. In the absence of both C<LC_ALL> and C<LC_MONETARY>,
C<LANG> chooses the monetary formatting locale.
=item LC_NUMERIC
In the absence of C<LC_ALL>, C<LC_NUMERIC> chooses the numeric format
locale. In the absence of both C<LC_ALL> and C<LC_NUMERIC>, C<LANG>
chooses the numeric format.
=item LC_TIME
In the absence of C<LC_ALL>, C<LC_TIME> chooses the date and time
formatting locale. In the absence of both C<LC_ALL> and C<LC_TIME>,
C<LANG> chooses the date and time formatting locale.
=item LANG
C<LANG> is the "catch-all" locale environment variable. If it is set, it
is used as the last resort after the overall C<LC_ALL> and the
category-specific C<LC_...>.
=back
=head2 Examples
The LC_NUMERIC controls the numeric output:
use locale;
use POSIX qw(locale_h); # Imports setlocale() and the LC_ constants.
setlocale(LC_NUMERIC, "fr_FR") or die "Pardon";
printf "%g\n", 1.23; # If the "fr_FR" succeeded, probably shows 1,23.
and also how strings are parsed by POSIX::strtod() as numbers:
use locale;
use POSIX qw(locale_h strtod);
setlocale(LC_NUMERIC, "de_DE") or die "Entschuldigung";
my $x = strtod("2,34") + 5;
print $x, "\n"; # Probably shows 7,34.
=head1 NOTES
=head2 Backward compatibility
Versions of Perl prior to 5.004 B<mostly> ignored locale information,
generally behaving as if something similar to the C<"C"> locale were
always in force, even if the program environment suggested otherwise
(see L<The setlocale function>). By default, Perl still behaves this
way for backward compatibility. If you want a Perl application to pay
attention to locale information, you B<must> use the S<C<use locale>>
pragma (see L<The use locale pragma>) to instruct it to do so.
Versions of Perl from 5.002 to 5.003 did use the C<LC_CTYPE>
information if available; that is, C<\w> did understand what
were the letters according to the locale environment variables.
The problem was that the user had no control over the feature:
if the C library supported locales, Perl used them.
=head2 I18N:Collate obsolete
In versions of Perl prior to 5.004, per-locale collation was possible
using the C<I18N::Collate> library module. This module is now mildly
obsolete and should be avoided in new applications. The C<LC_COLLATE>
functionality is now integrated into the Perl core language: One can
use locale-specific scalar data completely normally with C<use locale>,
so there is no longer any need to juggle with the scalar references of
C<I18N::Collate>.
=head2 Sort speed and memory use impacts
Comparing and sorting by locale is usually slower than the default
sorting; slow-downs of two to four times have been observed. It will
also consume more memory: once a Perl scalar variable has participated
in any string comparison or sorting operation obeying the locale
collation rules, it will take 3-15 times more memory than before. (The
exact multiplier depends on the string's contents, the operating system
and the locale.) These downsides are dictated more by the operating
system's implementation of the locale system than by Perl.
=head2 write() and LC_NUMERIC
Formats are the only part of Perl that unconditionally use information
from a program's locale; if a program's environment specifies an
LC_NUMERIC locale, it is always used to specify the decimal point
character in formatted output. Formatted output cannot be controlled by
C<use locale> because the pragma is tied to the block structure of the
program, and, for historical reasons, formats exist outside that block
structure.
=head2 Freely available locale definitions
There is a large collection of locale definitions at
ftp://dkuug.dk/i18n/WG15-collection . You should be aware that it is
unsupported, and is not claimed to be fit for any purpose. If your
system allows installation of arbitrary locales, you may find the
definitions useful as they are, or as a basis for the development of
your own locales.
=head2 I18n and l10n
"Internationalization" is often abbreviated as B<i18n> because its first
and last letters are separated by eighteen others. (You may guess why
the internalin ... internaliti ... i18n tends to get abbreviated.) In
the same way, "localization" is often abbreviated to B<l10n>.
=head2 An imperfect standard
Internationalization, as defined in the C and POSIX standards, can be
criticized as incomplete, ungainly, and having too large a granularity.
(Locales apply to a whole process, when it would arguably be more useful
to have them apply to a single thread, window group, or whatever.) They
also have a tendency, like standards groups, to divide the world into
nations, when we all know that the world can equally well be divided
into bankers, bikers, gamers, and so on. But, for now, it's the only
standard we've got. This may be construed as a bug.
=head1 Unicode and UTF-8
The support of Unicode is new starting from Perl version 5.6, and
more fully implemented in the version 5.8. See L<perluniintro> and
L<perlunicode> for more details.
Usually locale settings and Unicode do not affect each other, but
there are exceptions, see L<perlunicode/Locales> for examples.
=head1 BUGS
=head2 Broken systems
In certain systems, the operating system's locale support
is broken and cannot be fixed or used by Perl. Such deficiencies can
and will result in mysterious hangs and/or Perl core dumps when the
C<use locale> is in effect. When confronted with such a system,
please report in excruciating detail to <F<perlbug@perl.org>>, and
complain to your vendor: bug fixes may exist for these problems
in your operating system. Sometimes such bug fixes are called an
operating system upgrade.
=head1 SEE ALSO
L<I18N::Langinfo>, L<perluniintro>, L<perlunicode>, L<open>,
L<POSIX/isalnum>, L<POSIX/isalpha>,
L<POSIX/isdigit>, L<POSIX/isgraph>, L<POSIX/islower>,
L<POSIX/isprint>, L<POSIX/ispunct>, L<POSIX/isspace>,
L<POSIX/isupper>, L<POSIX/isxdigit>, L<POSIX/localeconv>,
L<POSIX/setlocale>, L<POSIX/strcoll>, L<POSIX/strftime>,
L<POSIX/strtod>, L<POSIX/strxfrm>.
=head1 HISTORY
Jarkko Hietaniemi's original F<perli18n.pod> heavily hacked by Dominic
Dunlop, assisted by the perl5-porters. Prose worked over a bit by
Tom Christiansen.
Last update: Thu Jun 11 08:44:13 MDT 1998
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