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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 current 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 category (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", 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
       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.

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 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.

ATTRIBUTES

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

       ┌────────────┬───────────────┬────────────────────────────┐
       │InterfaceAttributeValue                      │
       ├────────────┼───────────────┼────────────────────────────┤
       │setlocale() │ Thread safety │ MT-Unsafe const:locale env │
       └────────────┴───────────────┴────────────────────────────┘

CONFORMING TO

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

SEE ALSO

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

COLOPHON

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