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SETLOCALE(3)		   Linux Programmer's Manual		  SETLOCALE(3)

       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 accord-
       ing  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,  con-
	      version,	case-sensitive	comparison,  and  wide character func-

	      for localizable natural-language messages.

	      for monetary formatting.

	      for number formatting (such as the decimal point and  the	 thou-
	      sands 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_MONE-
       TARY,  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  cor-
       responds	to the 7-bit ASCII character set.

       A  locale  name	is  typically  of the form language[_territory][.code-
       set][@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 set-
       locale(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 process-
       ing if MB_CUR_MAX > 1, and by using strcoll(), wcscoll()	or  strxfrm(),
       wcsxfrm() to compare strings.

       A  successful  call to setlocale() returns an opaque string that	corre-
       sponds to the locale set.  This string may be allocated in static stor-
       age.   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

       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 Euro-
       pean 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), strf-
       time(3),	charsets(4), locale(7),	nl_langinfo(3)

GNU				  1999-07-04			  SETLOCALE(3)


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