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SETLOCALE(3)                                                            Linux Programmer's Manual                                                           SETLOCALE(3)

NAME
       setlocale - set the current locale

SYNOPSIS
       #include <locale.h>

       char *setlocale(int category, const char *locale);

DESCRIPTION
       The 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 cur‐
       rent locale should be modified.

       Category            Governs
       LC_ALL              All of the locale
       LC_ADDRESS          Formatting of addresses and geography-related items (*)
       LC_COLLATE          String collation
       LC_CTYPE            Character classification
       LC_IDENTIFICATION   Metadata describing the locale (*)
       LC_MEASUREMENT      Settings related to measurements (metric versus US customary) (*)
       LC_MESSAGES         Localizable natural-language messages
       LC_MONETARY         Formatting of monetary values
       LC_NAME             Formatting of salutations for persons (*)
       LC_NUMERIC          Formatting of nonmonetary numeric values
       LC_PAPER            Settings related to the standard paper size (*)
       LC_TELEPHONE        Formats to be used with telephone services (*)
       LC_TIME             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).

       The argument 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 call of setlocale().

       If locale is an empty string, "", 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 category), the environment variable LC_ALL is inspected, next the environment variable with the same name as the cat‐
       egory  (see  the  table  above), and finally the environment variable LANG.  The first existing environment variable is used.  If its value is not a valid locale
       specification, the locale is unchanged, and setlocale() returns NULL.

       The locale "C" or "POSIX" is a portable locale; it exists on all conforming systems.

       A locale name is typically of the form 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 UTF-8.  For a list of all supported locales, try "locale -a" (see 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, and then:

       β€’ using the values returned from a localeconv(3) call for locale-dependent information;

       β€’ using the multibyte and wide character functions for text processing if MB_CUR_MAX > 1;

       β€’ using strcoll(3) and strxfrm(3) to compare strings; and

       β€’ using wcscoll(3) and wcsxfrm(3) to compare wide-character strings.

RETURN VALUE
       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 re‐
       turned 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.

ATTRIBUTES
       For an explanation of the terms used in this section, see attributes(7).

       β”Œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”¬β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”
       β”‚Interface                                                                                                          β”‚ Attribute     β”‚ Value                      β”‚
       β”œβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”Όβ”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€
       β”‚setlocale()                                                                                                        β”‚ Thread safety β”‚ MT-Unsafe const:locale env β”‚
       β””β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”΄β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”€β”˜

CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C89, C99.

       The  C  standards specify only the categories LC_ALL, LC_COLLATE, LC_CTYPE, LC_MONETARY, LC_NUMERIC, and LC_TIME.  POSIX.1 adds LC_MESSAGES.  The remaining cate‐
       gories are GNU extensions.

SEE ALSO
       locale(1), localedef(1), isalpha(3), localeconv(3), nl_langinfo(3), rpmatch(3), strcoll(3), strftime(3), charsets(7), locale(7)

GNU                                                                            2021-03-22                                                                   SETLOCALE(3)