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NL_LANGINFO(3P)            POSIX Programmer's Manual           NL_LANGINFO(3P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.
NAME
       nl_langinfo - language information
SYNOPSIS
       #include <langinfo.h>
       char *nl_langinfo(nl_item item);

DESCRIPTION
       The nl_langinfo() function shall return a pointer to a string  contain-
       ing  information  relevant  to the particular language or cultural area
       defined in the program's locale (see <langinfo.h>).  The manifest  con-
       stant  names and values of item are defined in <langinfo.h>.  For exam-
       ple:

              nl_langinfo(ABDAY_1)
       would return a pointer to the string "Dom" if the  identified  language
       was Portuguese, and "Sun" if the identified language was English.
       Calls  to  setlocale() with a category corresponding to the category of
       item (see <langinfo.h>), or to the category LC_ALL , may overwrite  the
       array pointed to by the return value.
       The  nl_langinfo()  function  need not be reentrant. A function that is
       not required to be reentrant is not required to be thread-safe.
RETURN VALUE
       In a locale where langinfo data is  not  defined,  nl_langinfo()  shall
       return  a  pointer  to the corresponding string in the POSIX locale. In
       all locales, nl_langinfo() shall return a pointer to an empty string if
       item contains an invalid setting.
       This  pointer  may  point to static data that may be overwritten on the
       next call.
ERRORS
       No errors are defined.
       The following sections are informative.
EXAMPLES
   Getting Date and Time Formatting Information
       The following example returns a pointer to a string containing date and
       time  formatting information, as defined in the LC_TIME category of the
       current locale.

              #include <time.h>
              #include <langinfo.h>
              ...
              strftime(datestring, sizeof(datestring), nl_langinfo(D_T_FMT), tm);
              ...
APPLICATION USAGE
       The array pointed to by the return value should not be modified by  the
       program, but may be modified by further calls to nl_langinfo().
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       setlocale(), the Base Definitions volume of IEEE Std 1003.1-2001, Chap-
       ter 7, Locale, <langinfo.h>, <nl_types.h>
COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                      NL_LANGINFO(3P)