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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

       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.

       LC_ALL for all of the locale.

              for regular expression matching (it determines  the  meaning  of
              range expressions and equivalence classes) and string collation.

              for  regular  expression  matching,  character   classification,
              conversion,   case-sensitive   comparison,  and  wide  character

              for localizable natural-language messages.

              for monetary formatting.

              for number  formatting  (such  as  the  decimal  point  and  the
              thousands separator).

              for time and date formatting.

       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 "", 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   (LC_COLLATE,   LC_CTYPE,   LC_MESSAGES,
       LC_MONETARY,  LC_NUMERIC, LC_TIME) 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;  its  LC_CTYPE  part
       corresponds to the 7-bit ASCII character set.

       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.

       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()  call  for  locale  - dependent
       information, by using the multi-byte and wide character  functions  for
       text  processing  if MB_CUR_MAX > 1, and by using strcoll(), wstrcoll()
       or strxfrm(), wstrxfrm() to compare strings.


       A successful call to setlocale() returns a 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.


       ANSI C, POSIX.1


       Linux (that is,  GNU  libc)  supports  the  portable  locales  "C"  and
       "POSIX".   In  the  good  old  days  there  used  to be support for the
       European  Latin-1  "ISO-8859-1"  locale  (e.g.   in   libc-4.5.21   and
       libc-4.6.27), and the Russian "KOI-8" (more precisely, "koi-8r") locale
       (e.g.  in  libc-4.6.27),  so  that  having  an   environment   variable
       LC_CTYPE=ISO-8859-1 sufficed to make isprint() return the right answer.
       These days non-English speaking Europeans have to work  a  bit  harder,
       and must install actual locale files.


       locale(1),   localedef(1),   strcoll(3),   isalpha(3),   localeconv(3),
       strftime(3), charsets(4), locale(7)