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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)