Section (3) setlocale
setlocale — set the current locale
|const char *locale
setlocale() function is
used to set or query the program_zsingle_quotesz_s current locale.
locale is not
NULL, the program_zsingle_quotesz_s current locale is modified according to
the arguments. The argument
category determines which parts
of the program_zsingle_quotesz_s current locale should be modified.
||All of the locale|
Formatting of addresses and
geography-related items (*)
||Metadata describing the locale (*)|
Settings related to measurements
(metric versus US customary) (*)
||Localizable natural-language messages|
||Formatting of monetary values|
||Formatting of salutations for persons (*)|
||Formatting of nonmonetary numeric values|
||Settings related to the standard paper size (*)|
||Formats to be used with telephone services (*)|
||Formatting of date and time values|
The categories marked with an asterisk in the above table are GNU extensions. For further information on these locale categories, see locale(7).
locale is a pointer to a
character string containing the required setting of
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
locale is an
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
inspected, next the environment variable with the same name
as the category (see the table above), and finally the
first existing environment variable is used. If its value is
not a valid locale specification, the locale is unchanged,
The locale “C” or “POSIX” is a portable locale; it exists on all conforming systems.
A locale name is typically of the form
language is an ISO 639
territory is an ISO 3166
country code, and
codeset is a character set or
encoding identifier like
UTF-8. For a list of all
supported locales, try locale −a (see locale(1)).
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:
after program initialization, by using the values returned from a localeconv(3) call for locale-dependent information, by using the multibyte and wide character functions for text processing if MB_CUR_MAX > 1, and by using strcoll(3), wcscoll(3) or strxfrm(3), wcsxfrm(3) to compare strings.
A successful call to
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_zsingle_quotesz_s locale. The return
value is NULL if the request cannot be honored.
For an explanation of the terms used in this section, see attributes(7).
||Thread safety||MT-Unsafe const:locale env|
POSIX.1-2001, POSIX.1-2008, C89, C99.
The C standards specify only the categories
LC_TIME. POSIX.1 adds
LC_MESSAGES. The remaining categories are
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Copyright (c) 1993 by Thomas Koenig (ig25rz.uni-karlsruhe.de)
and Copyright 1999 by Bruno Haible (haibleclisp.cons.org)
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Modified Sat Jul 24 18:20:12 1993 by Rik Faith (faithcs.unc.edu)
Modified Tue Jul 15 16:49:10 1997 by Andries Brouwer (aebcwi.nl)
Modified Sun Jul 4 14:52:16 1999 by Bruno Haible (haibleclisp.cons.org)
Modified Tue Aug 24 17:11:01 1999 by Andries Brouwer (aebcwi.nl)
Modified Tue Feb 6 03:31:55 2001 by Andries Brouwer (aebcwi.nl)