setlocale
NAME
setlocale - set the current locale
SYNOPSIS
#include <locale.h> I char *setlocale(int category , const char * locale );
DESCRIPTION
The
R setlocale ()
function is used to set or query the program's current locale.
If
locale
is not NULL,
the program's current locale is modified according to the arguments.
The argument
category
determines which parts of the program's current locale should be modified.
LC_ALL
for all of the locale.
LC_COLLATE
for regular expression matching (it determines the meaning
of range expressions and equivalence classes) and string collation.
LC_CTYPE
for regular expression matching, character classification, conversion,
case-sensitive comparison, and wide character functions.
LC_MESSAGES
for localizable natural-language messages.
LC_MONETARY
for monetary formatting.
LC_NUMERIC
for number formatting (such as the decimal point and the thousands separator).
LC_TIME
for time and date formatting.
The argument
locale
is a pointer to a character string containing the
required setting of
R category .
Such a string is either a well-known constant like "C" or "da_DK"
(see below), or an opaque string that was returned by another call of
R setlocale ().
If
locale
is
R ,
each part of the locale that should be modified is set according to the
environment variables.
The details are implementation dependent.
For glibc, first
(regardless of
R category ),
the environment variable
LC_ALL
is inspected,
next the environment variable with the same name as the category
R LC_CTYPE ,
R LC_MESSAGES ,
R LC_MONETARY ,
R LC_NUMERIC ,
R LC_TIME )
and finally the environment variable
R LANG .
The first existing environment variable is used.
If its value is not a valid locale specification, the locale
is unchanged, and
R setlocale ()
returns NULL.
The locale
C
or
POSIX
is a portable locale; its
R LC_CTYPE
part corresponds to the 7-bit ASCII
character set.
A locale name is typically of the form
R language [_ territory ][. codeset ][@ modifier ],
where
language
is an ISO 639 language code,
territory
is an ISO 3166 country code, and
codeset
is a character set or encoding identifier like
ISO-8859-1
or
R UTF-8 .
For a list of all supported locales, try "locale -a", cf.
locale(1).
If
locale
is NULL, the current locale is only queried, not modified.
On startup of the main program, the portable
C
locale is selected as default.
A program may be made portable to all locales by calling
setlocale(LC_ALL, )
after program initialization, by using the values returned
from a
localeconv(3)
call
for locale-dependent information, by using the multi-byte and wide
character functions for text processing if
R MB_CUR_MAX > 1 ,
and by using
strcoll(3) ,
wcscoll(3)
or
strxfrm(3),
wcsxfrm(3)
to compare strings.
RETURN VALUE
A successful call to
R setlocale ()
returns an opaque string that corresponds to the locale set.
This string may be allocated in static storage.
The string returned is such that a subsequent call with that string
and its associated category will restore that part of the process's
locale.
The return value is NULL if the request cannot be honored.
CONFORMING TO
C89, C99, POSIX.1-2001.
NOTES
Linux (that is, GNU libc) supports the portable locales
R C and POSIX .
In the good old days there used to be support for
the European Latin-1
ISO-8859-1
locale (e.g., in libc-4.5.21 and libc-4.6.27), and the Russian
KOI-8
(more precisely, "koi-8r") locale (e.g., in libc-4.6.27),
so that having an environment variable LC_CTYPE=ISO-8859-1
sufficed to make
isprint(3)
return the right answer.
These days non-English speaking Europeans have to work a bit harder,
and must install actual locale files.
SEE ALSO
locale(1),
localedef(1),
isalpha(3),
localeconv(3),
nl_langinfo(3),
rpmatch(3),
strcoll(3),
strftime(3),
charsets(7),
locale(7)
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