setlocale man page on Archlinux

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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  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
       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 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

       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 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

GNU				  2008-12-05			  SETLOCALE(3)

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