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NAME

       setlocale - set the current locale

SYNOPSIS

       #include <locale.h>

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

DESCRIPTION

       The  setlocale() function is used to set or query the program's current
       locale.

       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.

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

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

       LC_MESSAGES
              for localizable natural-language messages.

       LC_MONETARY
              for monetary formatting.

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

       LC_TIME
              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.  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.

RETURN VALUE

       A  successful  call  to  setlocale()  returns  an  opaque  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.

CONFORMING TO

       C89, C99, POSIX.1-2001.

NOTES

       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.

SEE ALSO

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

COLOPHON

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