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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 extensions.


       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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