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       setlocale - set the current locale


       #include <locale.h>

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


       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" (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, 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'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).

       │InterfaceAttributeValue                      │
       │setlocale() │ Thread safety │ MT-Unsafe const:locale env │


       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 categories are GNU


       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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