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SETLOCALE(3)		   Linux Programmers Manual		 SETLOCALE(3)

       setlocale - set the current locale


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

       The  setlocale() function is used to set or query the programs current

       If locale is not NULL, the programs current locale is modified accord
       ing  to the arguments.  The argument category determines which parts of
       the programs 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 implementa
       tion-dependent.	For glibc, first (regardless of category),  the  envi
       ronment	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 set
       locale() 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:

	   setlocale(LC_ALL, "");

       after program initialization, by  using	the  values  returned  from  a
       localeconv(3)  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(3), wcscoll(3) or strxfrm(3),
       wcsxfrm(3) 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 pro
       cesss locale.  The return value is NULL if the request cannot be  hon

       C89, C99, POSIX.1-2001.

       Linux  (that  is, glibc) 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(3)  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),  isalpha(3),  localeconv(3),  nl_langinfo(3),
       rpmatch(3), strcoll(3), strftime(3), charsets(7), locale(7)

       This  page  is  part of release 3.05 of the Linux man-pages project.  A
       description of the project, and information about reporting  bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU				  1999-07-04			  SETLOCALE(3)

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